CN112193237A - System and method for controlling idling of engine and flow of hydraulic pump of active suspension automobile - Google Patents

System and method for controlling idling of engine and flow of hydraulic pump of active suspension automobile Download PDF

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Publication number
CN112193237A
CN112193237A CN202010978935.2A CN202010978935A CN112193237A CN 112193237 A CN112193237 A CN 112193237A CN 202010978935 A CN202010978935 A CN 202010978935A CN 112193237 A CN112193237 A CN 112193237A
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flow
control unit
main control
speed
hydraulic pump
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CN112193237B (en
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赵丁选
武理哲
李振兴
郭庆贺
李晓明
张伟
金忠
韩明远
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Yanshan University
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Yanshan University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/02—Control of vehicle driving stability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/22—Conjoint control of vehicle sub-units of different type or different function including control of suspension systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2420/00—Indexing codes relating to the type of sensors based on the principle of their operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0638—Engine speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/10—Change speed gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/22—Suspension systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/22—Suspension systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The invention discloses a system and a method for controlling idling of an active suspension automobile engine and flow of a hydraulic pump, wherein the system comprises a main control unit, a gear sensor, a vehicle speed sensor, a flow sensor, a rotating speed sensor, a hydraulic pump flow regulator and a timer; the gear sensor, the vehicle speed sensor, the flow sensor, the rotating speed sensor, the hydraulic pump flow regulator and the timer are respectively in communication connection with the main control unit, and the gear sensor, the vehicle speed sensor, the rotating speed sensor and the flow sensor transmit gear data, vehicle speed data, rotating speed data and flow data which are collected in real time to the main control unit; the main control unit adjusts the flow rate of the hydraulic pump and the rotating speed of the engine based on one or more of gear data, vehicle speed data, rotating speed data and flow data, solves the problem that the engine is flameout when the active suspension vehicle starts and the problem of fuel waste in the driving process, and saves energy.

Description

System and method for controlling idling of engine and flow of hydraulic pump of active suspension automobile
Technical Field
The invention relates to the technical field of vehicle engineering control, in particular to a control system and a control method for idling of an active suspension automobile engine and flow of a hydraulic pump.
Background
The suspension system is an important component of a vehicle, and the quality of the performance of the suspension system determines the ride comfort, steering stability and driving safety of the vehicle. The active suspension system based on the electro-hydraulic servo technology can adjust the output force or displacement of the electro-hydraulic servo actuator in real time according to the state of a vehicle body so as to deal with different running conditions. The normal operation of the active suspension system requires the engine to drive the hydraulic pump to stably output high-pressure oil with a certain flow rate. The idling of the engine is the lowest rotating speed when the accelerator is in a completely relaxed state, does not output power externally and can normally run, and is also called as the original idling. At present, an emergency rescue vehicle with an active suspension system faces the problem of how to coordinate and control the idle speed of an engine and the output flow of a hydraulic pump of the suspension system, and specifically comprises the following steps:
(1) when the engine is in the original idling state and the vehicle is in the parking state, the flow control knob is adjusted to continuously increase the oil flow output of the hydraulic pump until the flow value reaches the minimum flow required by the normal work of the active suspension system, and at the moment, the rotating speed of the engine is reduced to some extent compared with the prior art, but the engine can still normally run. However, if the driver operates the vehicle to start, if the accelerator is not operated, the engine receives an excessive torque at the time of starting, the rotation speed is rapidly reduced and unstable, and even the engine is pressed out and stalled.
(2) Generally, when the flow control knob is rotated to a certain position and fixed, the higher the engine speed, the greater the output flow of the hydraulic pump driven by the flow control knob. When the vehicle runs at a high speed, the engine with high rotating speed drives the hydraulic pump to output hydraulic oil with larger flow. If the flow value of the hydraulic pump output oil is larger than the flow value required by the normal work of the active suspension system, redundant oil flows away from the overflow valve, the supply and demand of the oil flow are greater, the oil consumption of the engine is increased undoubtedly under the condition, and the method is not preferable in the aspect of energy conservation.
At present, the technical problems related to the engine idle speed regulation and solutions thereof are mostly concentrated on automobile cranes, excavators, loaders, and the like. For example: the patent with the patent number of CN203081588U and the patent name of 'an engine idle speed control device of an automobile crane and the automobile crane' controls the idle speed of an engine by controlling a control handle, thereby reducing the fuel consumption in the lifting operation; the problem of flameout caused by sudden increase of engine torque in the prior art is solved by a patent with the patent number of CN103306330B and the patent name of engine idle speed control method and device, excavator and loader; the patent with the patent number of CN109278749A and the patent name of 'a control system and a control method for idling start and stop of an automobile' realizes the purposes of energy conservation and emission reduction by a method of stopping the automobile under an idling working condition. Although the above patent has achieved the purpose of energy saving and emission reduction and solved the problem of engine stall during operation, the technical solution disclosed therein is only suitable for solving the technical problems set forth therein under specific working conditions, i.e. the technical problems encountered during operation of mobile cranes, excavators, loaders, etc., and is not universal. The problems stated in the background of the patent include both the problem of engine start and shut-down and the problem of coordinated control of the hydraulic pump outlet flow of the active suspension system and the idle speed of the engine. The problem involved in this patent is relatively special and complex. Therefore, specific methods are needed to solve the problems described in this patent, and the technical solutions disclosed in the above patents cannot be followed.
To solve the problems proposed by this patent, the prior art is solved by the following two methods: firstly, the original idle speed value is increased according to experience, and although the method can fundamentally solve the problem of starting and flameout, the problem of fuel waste during high-speed driving is not solved, and the fuel consumption is increased when the engine stops and does not flameout, such as waiting for traffic lights or traffic jam, and is not available; secondly, when the vehicle starts, the driver steps on a certain accelerator in advance to start again, the method can solve the problem of starting flameout, but the driver needs to have rich experience on how much the accelerator is stepped on in advance, and if the accelerator is stepped on too little, the engine still can be pressed out and flameout during starting; if the accelerator is pressed down too much, the starting speed is too high, the danger index is increased, the burden of a driver is increased, and the driver cannot be taken, especially for a vehicle with an automatic gear, the driver cannot take the accelerator and the brake into account during starting, and the operation of pressing the accelerator while starting cannot be realized. Moreover, both of the above methods fail to achieve effective control of the output flow rate of the hydraulic pump when the vehicle is traveling at high speed. Therefore, other effective methods are sought for solving the above problems.
Disclosure of Invention
The invention provides a control system for the idling of an engine and the flow of a hydraulic pump, which aims at the defects in the prior art, is applied to an actively-suspended automobile, and discloses a control system and a method for the idling of the engine and the flow of the hydraulic pump, which are applied to the actively-suspended automobile, wherein the control system comprises a main control unit, a gear sensor, a vehicle speed sensor, a flow sensor, a rotating speed sensor, a hydraulic pump flow regulator and a timer; the gear sensor, the vehicle speed sensor, the flow sensor, the rotating speed sensor, the hydraulic pump flow regulator and the timer are respectively in communication connection with the main control unit, and the gear sensor, the vehicle speed sensor, the rotating speed sensor and the flow sensor transmit gear data, vehicle speed data, rotating speed data and flow data which are collected in real time to the main control unit; the main control unit adjusts the flow rate of the hydraulic pump and the rotating speed of the engine based on one or more of the gear data, the vehicle speed data, the rotating speed data and the flow data, so that the problems of engine flameout and fuel waste in the driving process when the active suspension vehicle starts are solved, and energy is saved.
The specific scheme of the invention is as follows: the invention provides a control system for idling of an engine and flow of a hydraulic pump of an active suspension automobile, wherein the control system comprises a main control unit, a gear sensor, a vehicle speed sensor, a rotating speed sensor, a flow sensor, a hydraulic pump flow regulator and a timer;
the gear sensor, the vehicle speed sensor, the flow sensor, the rotating speed sensor, the hydraulic pump flow regulator and the timer are respectively in communication connection with the main control unit, and the gear sensor, the vehicle speed sensor, the rotating speed sensor and the flow sensor transmit gear data, vehicle speed data, rotating speed data and flow data which are collected in real time to the main control unit; the main control unit adjusts the flow rate of the hydraulic pump and the rotating speed of an engine based on one or more data of the gear data, the vehicle speed data, the rotating speed data and the flow data;
presetting a first idle speed N0 and a second idle speed N of an engine, a first scale M0 of a flow regulator of the hydraulic pump, a first time T0 and a rated flow L0 of the hydraulic pump required by the normal work of an active suspension system in the main control unit;
when the engine of the vehicle is started and the rotating speed of the engine is stable, the vehicle is in a static state at the moment, the main control unit acquires rotating speed data of the rotating speed sensor and judges whether the idling speed of the engine is a first idling speed N0; if the idle speed is not the first idle speed N0, adjusting the idle speed of the engine to the first idle speed N0; if the idling speed of the engine is a first idling speed N0, the main control unit acquires flow data of the flow sensor and judges whether a flow knob of the hydraulic pump is located at a first scale M0, if not, the main control unit rotates the flow knob of the hydraulic pump to a first scale M0, and at the moment, the outlet flow L of the hydraulic pump can reach a rated flow L0 required by the normal work of the active suspension system;
the main control unit judges whether a driver places a gear lever on a forward gear or a reverse gear according to gear data acquired by a gear sensor, and if the driver places the gear lever on the forward gear or the reverse gear, the main control unit adjusts the idling speed of the engine from a first idling speed N0 to a second idling speed N; when the main control unit increases the idling speed of the engine from a first idling speed N0 to a second idling speed N, the main control unit judges whether the vehicle speed is 0 or not according to vehicle speed data collected by a vehicle speed sensor, if the vehicle speed is 0, a timer is started for timing, and when the recording time T of the timer is greater than T0, the main control unit decreases the idling speed of the engine from the second idling speed N to the first idling speed N0 and closes the timer; if the main control unit judges that the vehicle speed is not 0 through vehicle speed data collected by the vehicle speed sensor, the main control unit judges whether the outlet flow L of the hydraulic pump is larger than a second flow threshold value L02 through flow data collected by the flow sensor, if so, the main control unit controls the flow knob of the hydraulic pump to rotate towards the direction of reducing the outlet flow of the hydraulic pump until the outlet flow of the hydraulic pump is restored to the rated flow L0.
Further, the relationship between the first idling speed N0 and the second idling speed N is N0< N; l0 is set to a flow interval [ L01, L02], where L01 is the first flow threshold, L02 is the second flow threshold, and L01< L02.
In a preferred embodiment, the engine has a first idle speed N0 of 600r/min, a second idle speed N calculated to be 750r/min, a hydraulic pump flow knob first scale M0 of 20 degrees, a first flow threshold L01 set to 95L/min, a second flow threshold L02 set to 105L/min, and a first time T0 set to 20 s.
In a second aspect of the present invention, a control method based on the foregoing active suspension vehicle engine idle speed and hydraulic pump flow control system is further provided, where the method includes:
step S01: the driver starts the engine;
step S02: the main control unit judges whether the idling speed of the engine is a first idling speed N0, if so, the step S03 is continuously executed, otherwise, the step S04 is executed;
step S03: the main control unit judges whether the hydraulic pump flow regulator is at the first scale M0, if so, the step S05 is continuously executed, otherwise, the step S06 is executed;
step S04: the main control unit adjusts the idling speed of the engine to a first idling speed N0 and continues to execute the step S05;
step S05: the main control unit judges whether the driver puts the gear lever on the forward gear or the reverse gear through the gear sensor, if so, the step S07 is executed, otherwise, the step S02 is executed;
step S06: the main control unit controls the hydraulic pump flow regulator to rotate to the first scale M0, and continues to execute the step S05;
step S07: the main control unit increases the engine idle speed from a first idle speed N0 to a second idle speed N, and continues to execute the step S08;
step S08: the main control unit judges whether the vehicle speed is 0 through a vehicle speed sensor, if so, the step S09 is executed, otherwise, the step S12 is executed;
step S09: the master control unit timer starts timing;
step S10: the main control unit judges whether the timer time T is greater than a first time T0; if yes, go to step S11, otherwise return to step S08;
step S11: the master control unit timer stops counting time and returns to execute the step S02;
step S12: the main control unit judges whether the outlet flow L of the hydraulic pump is larger than a second flow threshold L02 through a flow sensor, if so, the step S13 is executed, and if not, the step S08 is executed;
step S13: the main control unit controls the hydraulic pump flow regulator to rotate in the direction of reducing the outlet flow of the hydraulic pump until the outlet flow of the hydraulic pump is restored to the rated flow L0, and then the main control unit returns to execute the step S08.
Further, when the vehicle is in a red light or needs to stop for waiting due to traffic jam, the vehicle is in a static state, the timer starts to count time, and when the time T recorded by the timer is longer than T0, the main control unit reduces the idling speed of the engine from the second idling speed N to the first idling speed N0 and closes the timer.
Compared with the prior art, the invention has the following beneficial effects:
the system and the method for controlling the idling of the engine and the flow of the hydraulic pump of the active suspension automobile are applied to the active suspension automobile, solve the problem of engine flameout when the active suspension automobile starts and the problem of fuel waste in the driving process, and save energy.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings.
FIG. 1 is a block diagram of a control system for idle speed and hydraulic pump flow of an engine of an active suspension vehicle according to an embodiment of the present invention; and
FIG. 2 is a flowchart illustrating a method for controlling idle speed and hydraulic pump flow of an engine of an active suspension vehicle according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in FIG. 1, the system for controlling the idle speed and the hydraulic pump flow of the engine of the active suspension automobile of the invention is applied to an active suspension automobile 1. The control system comprises a main control unit 2, a gear sensor 3, a vehicle speed sensor 4, a flow sensor 5, a rotating speed sensor 6, a hydraulic pump flow regulator 7 and a timer 8. The gear sensor 3 and the vehicle speed sensor 4 are arranged on the active suspension vehicle 1, the flow sensor 5 is used for collecting flow signals of a hydraulic pump 9 of the active suspension vehicle 1, and the rotating speed sensor 6 is used for monitoring the rotating speed of an engine 10 of the active suspension vehicle 1. The gear sensor 3, the vehicle speed sensor 4, the flow sensor 5, the rotating speed sensor 6, the hydraulic pump flow regulator 7 and the timer 8 are respectively in communication connection with the main control unit 2, and the gear sensor 3, the vehicle speed sensor 4, the rotating speed sensor 6 and the flow sensor 5 send gear data, vehicle speed data, rotating speed data and flow data which are collected in real time to the main control unit 2; the main control unit 2 adjusts the hydraulic pump flow rate and the engine speed based on one or more of the gear data, the vehicle speed data, the rotational speed data, and the flow data.
The gear sensor 3 is used for monitoring gear change and transmitting a gear signal to the main control unit 2; the vehicle speed sensor 4 is used for monitoring the vehicle speed change of the active suspension vehicle 1 and transmitting a vehicle speed signal to the main control unit 2; the flow sensor 5 is used for monitoring the outlet flow change of the hydraulic pump 9 and transmitting an outlet flow signal of the hydraulic pump 9 to the main control unit 2; the rotating speed sensor 6 is used for monitoring the rotating speed of an engine 10 of the active suspension automobile 1 and transmitting a rotating speed signal of the engine 10 to the main control unit 2; the hydraulic pump flow regulator 7 is used to regulate the outlet flow of the hydraulic pump 9. The timer 8 is used for timing, and it is preferable that the timer 8 is integrated inside the main control unit 2.
In one embodiment, a first idle speed N0 and a second idle speed N of the engine 10, a first scale M0 of the hydraulic pump flow regulator 7, a first time T0, and a rated flow rate L0 and L0 of the hydraulic pump 9 required for normal operation of the active suspension system are preset in the main control unit 2 as a flow rate section [ L01 and L02], wherein L01 is a first flow rate threshold, L02 is a second flow rate threshold, and L01< L02 and N0< N. When the engine 10 is at the second idle speed N, it can be ensured that the flow rate of the outlet of the hydraulic pump meets the requirement of the active suspension system on the one hand, and the vehicle starting engine does not stop on the other hand, and the size of the second idle speed N can be obtained by calculation according to the size of the power required by the hydraulic pump 9 and the power required by vehicle starting, and the specific calculation expression is as follows:
Figure BDA0002686860610000051
in the formula, P1Power required for hydraulic pumps, P2Power required for vehicle take-off, Toe1Torque of hydraulic pump, Toe2Is the vehicle breakaway torque.
As shown in fig. 2, the present invention further provides a control method of a control system for idling of an engine and flow rate of a hydraulic pump of an active suspension vehicle, wherein the control method specifically comprises the following steps:
step S01: the driver starts the engine 10;
step S02: the main control unit 2 judges whether the idling speed of the engine is a first idling speed N0, if so, the step S03 is continuously executed, otherwise, the step S04 is executed;
step S03: the main control unit 2 judges whether the hydraulic pump flow regulator 7 is at the first scale M0, if so, continues to perform step S05, otherwise, performs step S06;
step S04: the main control unit 2 adjusts the engine idle speed to the first idle speed N0, and continues to execute step S05;
step S05: the main control unit 2 judges whether the driver places the gear lever on the forward gear or the reverse gear through the gear sensor 3, if so, the step S07 is executed, otherwise, the step S02 is executed;
step S06: the main control unit 2 controls the hydraulic pump flow regulator 7 to rotate to the first scale M0, and continues to execute step S05;
step S07: the main control unit 2 increases the engine idle speed from the first idle speed N0 to the second idle speed N, and continues to execute step S08;
step S08: the main control unit 2 judges whether the vehicle speed is 0 through the vehicle speed sensor 4, if yes, step S09 is executed, otherwise, step S12 is executed;
step S09: the main control unit 2 starts timing by a timer;
step S10: the main control unit 2 determines whether the time T of the timer 8 is greater than the first time T0; if yes, go to step S11, otherwise return to step S08;
step S11: the main control unit 2 stops counting the time, and returns to execute step S02;
step S12: the main control unit 2 judges whether the outlet flow L of the hydraulic pump 9 is larger than a second flow threshold L02 through the flow sensor 5, if so, the step S13 is executed, otherwise, the step S08 is executed in a returning way;
step S13: the main control unit 2 controls the hydraulic pump flow regulator 7 to rotate in the direction of reducing the outlet flow of the hydraulic pump until the outlet flow of the hydraulic pump is restored to the rated flow L0, and then returns to execute step S08.
When a driver starts a vehicle engine and the engine speed is stable, the vehicle is in a static state at the moment, the main control unit 2 acquires the speed data of the speed sensor 6 and judges whether the engine idling is a first idling speed N0; if not, adjusting the engine idle speed to a first idle speed N0;
in one embodiment, the main control unit 2 acquires the flow data of the flow sensor 5 and determines whether the hydraulic pump flow regulator 7 is at the first scale M0; if not, the main control unit 2 rotates the hydraulic pump flow regulator to the first scale M0;
in one embodiment, when the vehicle is at a standstill and at a first idling speed N0, and the hydraulic pump flow regulator 7 is at the scale M0, the outlet flow of the hydraulic pump 9 can reach the rated flow L0 required by the normal operation of the active suspension system;
in one embodiment, the main control unit 2 judges whether the driver puts the gear lever in the forward gear or the reverse gear according to the gear data collected by the gear sensor 3, if so, the main control unit 2 increases the idling speed of the engine from the first idling speed N0 to the second idling speed N;
in one embodiment, after the main control unit 2 increases the idling speed of the engine from the first idling speed N0 to the second idling speed N, the main control unit 2 judges whether the vehicle speed is 0 or not according to the vehicle speed data collected by the vehicle speed sensor 4, if the vehicle speed is 0, the timer 8 is started to count time, and when the time T recorded by the timer is greater than T0, the main control unit 2 decreases the idling speed of the engine from the second idling speed N to the first idling speed N0 and closes the timer; if the vehicle speed is not 0, the main control unit 2 judges whether the outlet flow of the hydraulic pump is larger than a second flow threshold value L02 according to the flow data collected by the flow sensor 5, if so, the main control unit 2 controls the hydraulic pump flow regulator to rotate towards the direction of reducing the outlet flow of the hydraulic pump until the outlet flow of the hydraulic pump is restored to the rated flow L0.
In one embodiment, when the vehicle is in a stop state when a red light is on the road or a vehicle is in a traffic jam and waiting, the timer 8 starts to count time, and when the time T recorded by the timer is greater than T0, the main control unit 2 reduces the idle speed of the engine from the second idle speed N to the first idle speed N0 and turns off the timer.
For the sake of understanding of the foregoing control method, the following further explains the above steps S01 to S13 and the embodiment.
When the driver starts the engine 10 of the vehicle and the engine speed is stable after a short time, and the vehicle is stationary, the main control unit 2 performs step S02, and the main control unit 2 determines whether the engine idle speed is the first idle speed N0 through the speed sensor 6. If the engine idling speed is the first idling speed N0, continuing to execute the step S03; if not, the engine idle speed is adjusted to the first idle speed N0 in step S04. In step S03, the main control unit 2 determines whether the hydraulic pump flow regulator is at the first scale M0 through the flow sensor 5. If the hydraulic pump flow regulator is at the first graduation M0, execution of step S05 is continued, otherwise the hydraulic pump flow regulator 7 is rotated to the first graduation M0 by executing step S06. Before the vehicle starts from the engine to start running, the output power of the engine only needs to meet the normal working requirement of the active suspension system, and no more power needs to be output additionally. The final goal of the main control unit 2 performing steps S01 to S04 is to achieve the engine idle speed at the first idle speed N0 when the vehicle is stationary, and the main control unit 2 controls the hydraulic pump flow regulator 7 at the first scale M0. The idling speed of the engine is first idling speed N0, when the flow regulator rotates to the position of a first scale M0, the outlet flow of the hydraulic pump can reach rated flow L0 required by normal work of the active suspension system, and the control method can effectively solve the problem of fuel waste when the engine is always in a high idling speed in the prior art.
In step S05, the main control unit 2 determines whether the driver has placed the shift lever in the forward gear or the reverse gear by the shift position sensor 3. If the driver puts the gear lever on the forward gear or the reverse gear, the next step of the vehicle is ready for starting and running. When the vehicle starts to run, in order to prevent the engine from stalling due to excessive torque, the main control unit 2 increases the idling speed of the engine from the first idling speed N0 to the second idling speed N in step S07. If the driver does not place the shift lever in the forward gear or the reverse gear, indicating that the vehicle is not ready for starting, the main control unit 2 returns to step S02, and executes the subsequent steps in a loop from step S02, and the loop is ended until the driver actively turns off the engine or places the shift lever in the forward gear or the reverse gear.
After the idling speed of the engine is increased from the first idling speed N0 to the second idling speed N, if the driver does not operate the vehicle to start, the vehicle is still in place and continues to be stationary for a long time T, if T > T0, in order to avoid fuel waste, the main control unit 2 should decrease the engine idling speed from the higher second idling speed N to the first idling speed N0, that is, after the main control unit 2 finishes the step S07, the main control unit 2 continues to execute the step S08, that is, the main control unit 2 determines whether the vehicle speed is 0 through the vehicle speed sensor 4. When the main control unit 2 determines that the vehicle speed is 0, it continues to perform steps S09 and S10, i.e., the timer records the time T, and determines whether the time T is greater than T0. When the time T is greater than T0, the main control unit 2 continues to execute step S11, turns off the timer 8 and returns to execute step S02, so as to reduce the idling speed of the engine from the second idling speed N to the first idling speed N0, thereby achieving the purpose of reducing the oil consumption. If the time T recorded by the timer 8 in step S10 is not greater than T0, it indicates that the vehicle has a short stationary time and low fuel consumption after step S07, and to avoid the main control unit 2 frequently executing related steps in a short time, therefore, when the time T recorded by the timer of the main control unit 2 in step S10 is not greater than T0, the main control unit 2 returns to step S08, that is, the system loops to step S08, and continues to determine whether the vehicle speed is 0, and the timer 8 continues to count time until the vehicle speed is not 0 or the time T is greater than T0, thereby ending the loop.
When the main control unit 2 determines that the vehicle speed is not 0 by executing step S08, it indicates that the vehicle completes the start travel after the execution of step S07 is completed. During driving, the vehicle is driven at a low speed or a high speed due to the operation of the driver, the engine 10 rotates at a speed greater than the second idle speed N, and the increase of the engine speed causes the outlet flow L of the hydraulic pump 9 to be greater than the rated flow L0. When the outlet flow L of the hydraulic pump 9 is greater than L0, the redundant flow flows back to the oil tank from the overflow valve of the active suspension system, which causes flow waste and further causes fuel waste. Therefore, after the main control unit 2 determines that the hydraulic pump outlet flow rate L is greater than the second flow rate threshold value L02 through step S12, step S13 is executed, in which the main control unit 2 controls the hydraulic pump flow rate regulator 7 to rotate in a direction to decrease the hydraulic pump outlet flow rate until the hydraulic pump outlet flow rate is restored to the rated flow rate L0. The adjustment process reduces the waste of fuel oil in the running process of the vehicle and achieves the purposes of energy conservation and emission reduction.
In addition, when the vehicle needs to stop for waiting at a red light or traffic jam, the purposes of energy conservation and emission reduction can be realized by adjusting through corresponding steps. When the vehicle stops at a red light on the road and waits, the vehicle is in a static state, the idle speed of the engine 10 is the second idle speed N, if the red light waiting time is long, the idle speed of the engine should be reduced from the second idle speed N to the first idle speed N0 for the purpose of saving fuel, therefore, when the main control unit 2 determines that the vehicle speed is 0 through the step S08, the steps S09, S10 and S11 are immediately executed according to the flow, and the step S11 returns to the step S02 and the subsequent steps, and finally the second idle speed N0 is reduced to the first idle speed N. Therefore, the purposes of energy conservation and emission reduction when the vehicle waits for a traffic signal lamp or stops in a traffic jam are achieved through the adjusting process.
In order to verify the beneficial effects of the technology, the inventor takes an autonomously developed emergency rescue vehicle with an active suspension as a test object and carries out a comparative test on the prior art and the technology of the invention. The vehicle used for the test is a three-axle six-wheel heavy vehicle. The test was carried out in two parts, the first part: respectively applying the prior art and the technology of the invention to carry out a comparison test of the flameout frequency of the engine during starting; a second part: the prior art and the technology of the invention are respectively applied to carry out a hundred kilometers driving oil consumption contrast test. The adopted prior art is two, the first prior art: the driver controls the accelerator according to the driving experience, and the vehicle is operated to normally start and run; the second prior art: the engine is in high idle speed in the whole process of starting and running of the vehicle. The engine flameout frequency comparison test is carried out when starting by adopting the first prior art and the technology of the invention; a hundred kilometer fuel consumption comparison test is performed by adopting a second prior art and the technology of the invention.
In two tests, the technical relevant parameters of the invention are set as follows: the first idling speed N0 of the engine 10 is 600r/min, the second idling speed N is calculated to be 750r/min, the first scale M0 of the hydraulic pump flow regulator 7 is 20 degrees, the outlet flow L0 of the hydraulic pump 9 is 100L/min, the first flow threshold L01 is set to be 95L/min, the second flow threshold L02 is set to be 105L/min, and the first time T0 is set to be 20 s.
When the first prior art is adopted for testing, the idling speed of the engine 10 is always 600r/min, the first scale M0 of the hydraulic pump flow regulator 7 is always 20 degrees, and other parameters are not set.
When the second prior art is adopted for testing, the idle speed of the engine 10 is always 750r/min, the first scale M0 of the hydraulic pump flow regulator 7 is always 20 degrees, and other parameters are not set.
All tests are carried out in an automobile test field, and the starting times in the starting engine flameout frequency contrast test are set to be 20 times; in the hundred-kilometer oil consumption comparison test, the total driving mileage is 100 kilometers, the average speed per hour is 60km/h, and the total driving mileage is selected to be performed on the same test road. In order to ensure that the conditions of the contrast test are the same, in the fuel consumption contrast test of hundred kilometers, a driver actively stops for waiting according to a road marker person, so that the working conditions of waiting for traffic lights or traffic jam and the like are simulated. In the course of one hundred kilometers, the number of parking waiting times is set to 6, and the waiting time is set to 60 s.
The comparative test of the flameout frequency of the starting engine is carried out by adopting the first prior art and the technology of the invention, and the result shows that: by applying the first prior art, the flameout frequency is 3 times and 15% in 20 starting tests, but by applying the technology of the invention, no flameout phenomenon occurs.
The results of a hundred kilometer oil consumption comparison test performed by the second prior art and the technology of the invention show that the second prior art consumes about 72L of oil for a hundred kilometers, while the technology of the invention consumes about 63L of oil for a hundred kilometers, and compared with the first prior art, the technology of the invention can reduce the oil consumption by 12.5% for a hundred kilometers.
Compared with the prior art, the engine starting flameout problem can be solved by adopting the technology, and the engine starting flameout problem has excellent effects of energy conservation and emission reduction.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (6)

1. A control system for idling of an engine of an active suspension automobile and flow of a hydraulic pump is characterized by comprising a main control unit, a gear sensor, a vehicle speed sensor, a rotating speed sensor, a flow sensor, a hydraulic pump flow regulator and a timer;
the gear sensor, the vehicle speed sensor, the flow sensor, the rotating speed sensor, the hydraulic pump flow regulator and the timer are respectively in communication connection with the main control unit, and the gear sensor, the vehicle speed sensor, the rotating speed sensor and the flow sensor transmit gear data, vehicle speed data, rotating speed data and flow data which are collected in real time to the main control unit; the main control unit adjusts the flow rate of the hydraulic pump and the rotating speed of an engine based on one or more data of the gear data, the vehicle speed data, the rotating speed data and the flow data;
presetting a first idle speed N0 and a second idle speed N of an engine, a first scale M0 of a flow regulator of the hydraulic pump, a first time T0 and a rated flow L0 of the hydraulic pump required by the normal work of an active suspension system in the main control unit;
when the engine of the vehicle is started and the rotating speed of the engine is stable, the vehicle is in a static state at the moment, the main control unit acquires the rotating speed data of the rotating speed sensor and judges whether the idling speed of the engine is a first idling speed N0; if not, adjusting the engine idle speed to a first idle speed N0; the main control unit acquires flow data of the flow sensor and judges whether a hydraulic pump flow regulator is positioned at a first scale M0; if not, the main control unit rotates the hydraulic pump flow regulator to a first scale M0; when the vehicle is at a standstill and at a first idling speed N0, when the flow regulator of the hydraulic pump is at the M0 scale, the outlet flow of the hydraulic pump can reach the rated flow L0 required by the normal work of the active suspension system;
the main control unit judges whether a driver places a gear lever on a forward gear or a reverse gear according to gear data acquired by a gear sensor, and if so, the main control unit increases the idling speed of the engine from a first idling speed N0 to a second idling speed N; when the main control unit increases the idling speed of the engine from a first idling speed N0 to a second idling speed N, the main control unit judges whether the vehicle speed is 0 or not according to vehicle speed data collected by a vehicle speed sensor, if the vehicle speed is 0, a timer is started for timing, and when the recording time T of the timer is greater than T0, the main control unit decreases the engine idling speed from the second idling speed N to the first idling speed N0, and the timer is closed; if the vehicle speed is not 0, the main control unit judges whether the outlet flow of the hydraulic pump is larger than a second flow threshold value L02 according to the flow data collected by the flow sensor, and if so, the main control unit controls the hydraulic pump flow regulator to rotate towards the direction of reducing the outlet flow of the hydraulic pump until the outlet flow of the hydraulic pump is restored to the rated flow L0.
2. The active suspension vehicle engine idle and hydraulic pump flow control system of claim 1, wherein the first idle N0 and the second idle N have a relationship of N0< N; l0 is set to a flow interval [ L01, L02], where L01 is the first flow threshold, L02 is the second flow threshold, and L01< L02.
3. The system as claimed in claim 1, wherein the first idling speed N0 of the engine is 600r/min, the second idling speed N is calculated to be 750r/min, the first scale M0 of the hydraulic pump flow knob is 20 degrees, the first flow threshold L01 is set to 95L/min, the second flow threshold L02 is set to 105L/min, and the first time T0 is set to 20 s.
4. A method for controlling the idle speed and the hydraulic pump flow of an engine of an active suspension automobile based on any one of claims 1 to 3, which is characterized by comprising the following steps:
step S01: the driver starts the engine;
step S02: the main control unit judges whether the idling speed of the engine is a first idling speed N0, if so, the step S03 is continuously executed, otherwise, the step S04 is executed;
step S03: the main control unit judges whether the hydraulic pump flow regulator is at the first scale M0, if so, the step S05 is continuously executed, otherwise, the step S06 is executed;
step S04: the main control unit adjusts the idling speed of the engine to a first idling speed N0 and continues to execute the step S05;
step S05: the main control unit judges whether the driver puts the gear lever on the forward gear or the reverse gear through the gear sensor, if so, the step S07 is executed, otherwise, the step S02 is executed;
step S06: the main control unit controls the hydraulic pump flow regulator to rotate to the first scale M0, and continues to execute the step S05;
step S07: the main control unit increases the engine idle speed from a first idle speed N0 to a second idle speed N, and continues to execute the step S08;
step S08: the main control unit judges whether the vehicle speed is 0 through a vehicle speed sensor, if so, the step S09 is executed, otherwise, the step S12 is executed;
step S09: the master control unit timer starts timing;
step S10: the main control unit judges whether the timer time T is greater than a first time T0; if yes, go to step S11, otherwise return to step S08;
step S11: the master control unit timer stops counting time and returns to execute the step S02;
step S12: the main control unit judges whether the outlet flow L of the hydraulic pump is larger than a second flow threshold L02 through a flow sensor, if so, the step S13 is executed, and if not, the step S08 is executed;
step S13: the main control unit controls the hydraulic pump flow regulator to rotate in the direction of reducing the outlet flow of the hydraulic pump until the outlet flow of the hydraulic pump is restored to the rated flow L0, and then the main control unit returns to execute the step S08.
5. The control method of the active suspension automobile engine idle speed and hydraulic pump flow control system according to claim 4,
when a driver starts a vehicle engine and the rotating speed of the engine is stable, the vehicle is in a static state at the moment, the main control unit acquires the rotating speed data of the rotating speed sensor and judges whether the idling speed of the engine is a first idling speed N0; if not, adjusting the engine idle speed to a first idle speed N0;
the main control unit acquires flow data of the flow sensor and judges whether a hydraulic pump flow regulator is positioned at a first scale M0; if not, the main control unit rotates the hydraulic pump flow regulator to a first scale M0;
when the vehicle is at a standstill and at a first idling speed N0, when the flow regulator of the hydraulic pump is at the M0 scale, the outlet flow of the hydraulic pump can reach the rated flow L0 required by the normal work of the active suspension system;
the main control unit judges whether a driver places a gear lever on a forward gear or a reverse gear according to gear data acquired by a gear sensor, and if so, the main control unit increases the idling speed of the engine from a first idling speed N0 to a second idling speed N;
when the main control unit increases the idling speed of the engine from a first idling speed N0 to a second idling speed N, the main control unit judges whether the vehicle speed is 0 or not according to vehicle speed data collected by a vehicle speed sensor, if the vehicle speed is 0, a timer is started for timing, and when the recording time T of the timer is greater than T0, the main control unit decreases the idling speed of the engine from the second idling speed N to the first idling speed N0 and closes the timer; if the vehicle speed is not 0, the main control unit judges whether the outlet flow of the hydraulic pump is larger than a second flow threshold value L02 according to the flow data collected by the flow sensor, and if so, the main control unit controls the hydraulic pump flow regulator to rotate towards the direction of reducing the outlet flow of the hydraulic pump until the outlet flow of the hydraulic pump is restored to the rated flow L0.
6. The method as claimed in claim 4 or 5, wherein when the vehicle is in a stop state when a red light is on the road or a vehicle is jammed and waiting for a stop, the timer starts to count, and when the timer counts a time T greater than T0, the main control unit reduces the engine idle speed from the second idle speed N to the first idle speed N0 and closes the timer.
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