CN115962280B - Control method and system for preventing low-rotation-speed accelerator stepping and gear dragging and vehicle - Google Patents
Control method and system for preventing low-rotation-speed accelerator stepping and gear dragging and vehicle Download PDFInfo
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- CN115962280B CN115962280B CN202310000230.7A CN202310000230A CN115962280B CN 115962280 B CN115962280 B CN 115962280B CN 202310000230 A CN202310000230 A CN 202310000230A CN 115962280 B CN115962280 B CN 115962280B
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Abstract
The invention discloses a control method, a control system and a vehicle for preventing low-rotation-speed accelerator stepping and dragging, which comprise the following steps: step one, after an accelerator is released, if the accelerator opening is 0, the engine speed is less than a first speed threshold corresponding to the current gear, the engine output torque variation of n continuous periods is less than a preset torque threshold, the oil temperature in a locking clutch is greater than a preset oil temperature threshold, and the actual oil pressure of the locking clutch is controlled to be equal to an oil pressure calibration value; step two, when the accelerator is stepped down, keeping the actual oil pressure of the locking clutch unchanged until the engine speed is greater than or equal to a second speed threshold corresponding to the current gear, and controlling the actual oil pressure of the locking clutch to rise; and thirdly, when the actual oil pressure of the lockup clutch is equal to the required oil pressure of the lockup clutch, the control is exited. The invention can realize the accurate control of the locking clutch, reduce the transmission efficiency waste and improve the NVH performance.
Description
Technical Field
The invention belongs to the field of automobile control, and particularly relates to a control method and system for preventing low-rotation-speed accelerator stepping and dragging and a vehicle.
Background
Vehicles with AT (i.e., automatic transmission) do not unlock and step on the small throttle AT low speeds, and there is a drag problem caused by insufficient engine torque. The drag gear is mainly expressed in the vibration of the whole vehicle lasting for a few seconds, and a user can sense the vibration transmitted by the steering wheel, the seat, the center control armrest box, the accelerator pedal and the like. The step-on accelerator drag gear refers to the phenomenon that the driving force of an engine is far insufficient to overcome external resistance when the engine runs at a lower rotating speed, so that the engine or a transmission system vibrates in a short time.
In order to provide a driving force for stepping on the accelerator, an unlocking strategy (see fig. 2) is generally adopted to ensure that the gear cannot be dragged, namely, the gear is unlocked after the accelerator is released and the engine speed is reduced to a certain value (such as 1100 rpm), the oil pressure is emptied, a locking point is triggered when the accelerator is stepped on, and a locking command is executed after the oil cylinder of the hydraulic torque converter is filled with oil. The method has the defects that the rotating speed difference between an engine and a turbine is not controlled every time the accelerator is stepped on, the locking time is long, and the locking time is also not controlled, so that the energy transmission efficiency is poor, and the NVH performance is poor.
Disclosure of Invention
The invention aims to provide a control method, a control system and a vehicle for preventing low-speed accelerator stepping and dragging, so as to realize accurate control of a locking clutch, reduce transmission efficiency waste and improve NVH performance.
The control method for preventing low-rotation-speed accelerator stepping from dragging comprises the following steps:
Step one, after an accelerator is released, if the accelerator opening is 0, the engine speed is less than a first speed threshold corresponding to the current gear, the engine output torque variation of n continuous periods is less than a preset torque threshold, the oil temperature in a locking clutch is greater than a preset oil temperature threshold, the actual oil pressure of the locking clutch is controlled to be equal to an oil pressure calibration value, and then step two is executed; and the preset oil pressure calibration value table corresponding to the current gear is a corresponding relation table of the engine speed, the engine output torque and the oil pressure calibration value under the current gear. If the accelerator opening is not equal to 0, the engine still drives the automobile in the forward direction, the output torque of the engine is larger than 0, the engine speed is relatively high, enough driving force is provided, and the dragging is avoided. If the engine speed is greater than or equal to the first speed threshold corresponding to the current gear, the drag problem does not occur. The stability of the engine output torque is judged by using the engine output torque variation quantity of n continuous periods, mainly preventing the sudden change of load or the sudden oil break of the engine from causing large oil pressure fluctuation, being unfavorable for the subsequent control, and when the engine output torque is judged to be stable (namely, the engine output torque variation quantity of n continuous periods is smaller than a preset torque threshold value), the oil pressure is relatively stable.
Step two, when the accelerator is stepped down, keeping the actual oil pressure of the locking clutch unchanged until the engine speed is greater than or equal to a second speed threshold corresponding to the current gear, controlling the actual oil pressure of the locking clutch to rise, and then executing step three; wherein the second rotational speed threshold corresponding to the current gear is greater than the first rotational speed threshold corresponding to the current gear.
And thirdly, when the actual oil pressure of the lockup clutch is equal to the required oil pressure of the lockup clutch, the control is exited.
Preferably, the slope of the actual oil pressure rise of the lockup clutch is: dividing the difference between the required oil pressure of the lock-up clutch and the actual oil pressure of the lock-up clutch at the moment when the accelerator is stepped on by the calibration time; the calibration time is obtained by inquiring a preset calibration time table according to the current gear, wherein the preset calibration time table is a corresponding relation table of the gear and the calibration time, so that the actual oil pressure rising slope of the locking clutch is more reasonable.
Preferably, in the preset oil pressure calibration value table corresponding to the current gear, the lower the engine speed is, the smaller the oil pressure calibration value is, and the minimum oil pressure calibration value is greater than or equal to the standby pressure of the full oil of the locking clutch (so that accurate and rapid execution of the locking command can be ensured). Under the condition that the engine speed is lower and then the engine load is not large, the oil pressure calibration value is properly reduced, so that the load to be overcome by the engine after stepping on the accelerator is as small as possible, and the engine speed is easier and faster to reach a second speed threshold corresponding to the current gear.
Preferably, the first rotation speed threshold value corresponding to the current gear is obtained by: inquiring a preset first rotation speed threshold value table according to the current gear to obtain a first rotation speed threshold value corresponding to the current gear; the preset first rotation speed threshold value table is a corresponding relation table of gear and a first rotation speed threshold value.
Preferably, the second rotation speed threshold value corresponding to the current gear is obtained by: inquiring a preset second rotation speed threshold value table according to the current gear to obtain a second rotation speed threshold value corresponding to the current gear; the preset second rotating speed threshold value table is a corresponding relation table of gear and a second rotating speed threshold value.
Preferably, n=3.
The control system for preventing low-speed accelerator pedal dragging comprises a controller, wherein the controller is programmed so as to execute the control method for preventing low-speed accelerator pedal dragging.
The vehicle comprises the control system for preventing low-rotation-speed accelerator stepping and dragging.
According to the invention, after the accelerator is released, the actual oil pressure of the locking clutch is adjusted according to the engine speed and the engine output torque, and the lower the engine speed is, the lower the actual oil pressure of the locking clutch is; after the rotational speed of the accelerator pedal engine reaches a second rotational speed threshold (namely a supercharging region) corresponding to the current gear, the actual oil pressure of the locking clutch is increased to the oil pressure required by the locking clutch (corresponding to the output torque of the engine) in the calibration time, and the torque-increasing characteristic of the hydraulic torque converter is utilized during locking, so that the driving force of the accelerator pedal can be ensured without unlocking even if the rotational speed of the engine is still lower, the accurate control of the locking clutch is realized, and the engine and the turbine rotational speed can be quickly meshed due to no need of an oil filling process, the transmission efficiency waste is reduced, the NVH performance is improved, and the problem of dragging the accelerator pedal with low rotational speed is reasonably solved.
Drawings
Fig. 1 is a flowchart of a control method for preventing low-speed accelerator pedal from dragging in the present embodiment.
Fig. 2 is a control comparison diagram of the control method in the present embodiment and the conventional control method.
Detailed Description
As shown in fig. 1 and 2, the control method for preventing the low-rotation-speed accelerator stepping and dragging in the embodiment includes the following steps:
S1, judging whether an accelerator released signal is received, if so, executing S2, and if not, ending.
S2, judging whether the accelerator opening is 0, the engine rotating speed is smaller than a first rotating speed threshold corresponding to the current gear, the engine output torque variation of 3 continuous periods is smaller than a preset torque threshold, the oil temperature in the locking clutch is larger than a preset oil temperature threshold, if so, executing S3, otherwise, returning to executing S1. And inquiring a preset first rotation speed threshold value table according to the current gear to obtain a first rotation speed threshold value corresponding to the current gear. The preset first rotation speed threshold value table is a corresponding relation table of gear and first rotation speed threshold value, and is obtained through calibration.
S3, controlling the actual oil pressure of the lockup clutch to be equal to an oil pressure calibration value (see FIG. 2), and then executing S4. The oil pressure calibration value is obtained by inquiring a preset oil pressure calibration value table corresponding to the current gear according to the rotation speed of the engine and the output torque of the engine. The preset oil pressure calibration value table corresponding to the current gear is a corresponding relation table (obtained by calibration) of the engine rotating speed, the engine output torque and the oil pressure calibration value under the current gear, the lower the engine rotating speed is, the smaller the oil pressure calibration value is, and the minimum oil pressure calibration value is larger than or equal to the standby pressure of the locking clutch filled with oil.
S4, judging whether an accelerator is stepped down signal is received, if yes, executing S5, otherwise, returning to executing S3.
And S5, keeping the actual oil pressure of the lockup clutch unchanged (namely, keeping the actual oil pressure of the lockup clutch unchanged at an oil pressure calibration value corresponding to the moment when the accelerator is depressed), and then executing S6.
And S6, judging whether the engine speed is greater than or equal to a second speed threshold corresponding to the current gear, if so (namely, the engine speed exceeds the speed limit and flies to a supercharging region), executing S7, otherwise, continuing executing S6. And inquiring a preset second rotating speed threshold value table according to the current gear to obtain a second rotating speed threshold value corresponding to the current gear. The preset second rotating speed threshold value table is a corresponding relation table of gear and a second rotating speed threshold value, and is obtained through calibration. The second rotational speed threshold value corresponding to the current gear is greater than the first rotational speed threshold value corresponding to the current gear.
S7, controlling the actual oil pressure of the lockup clutch to rise, and then executing S8. The slope of the actual oil pressure rise of the lockup clutch is as follows: the difference between the lock-up clutch demand oil pressure and the lock-up clutch actual oil pressure at the time when the accelerator is depressed (also the oil pressure calibration value corresponding to the time when the accelerator is depressed) is divided by the calibration time. The calibration time is obtained by inquiring a preset calibration time table according to the current gear, wherein the preset calibration time table is a corresponding relation table of the gears and the calibration time, so that different gears have different slopes. The required oil pressure of the lock-up clutch corresponds to the output torque of the engine, and the obtaining mode belongs to the prior art.
S8, judging whether the actual oil pressure of the lockup clutch is equal to the required oil pressure of the lockup clutch, if so, ending (namely, exiting control), otherwise, returning to S7.
The embodiment also provides a control system for preventing low-speed accelerator pedal from dragging, which comprises a controller programmed to execute the control method for preventing low-speed accelerator pedal from dragging.
The embodiment also provides a vehicle, which comprises the control system for preventing the low-rotation-speed accelerator stepping and dragging.
Claims (7)
1. A control method for preventing low-rotation-speed accelerator stepping and dragging is characterized by comprising the following steps:
Step one, after an accelerator is released, if the accelerator opening is 0, the engine speed is less than a first speed threshold corresponding to the current gear, the engine output torque variation of n continuous periods is less than a preset torque threshold, the oil temperature in a locking clutch is greater than a preset oil temperature threshold, the actual oil pressure of the locking clutch is controlled to be equal to an oil pressure calibration value, and then step two is executed; the oil pressure calibration value is obtained by inquiring a preset oil pressure calibration value table corresponding to the current gear according to the engine speed and the engine output torque, wherein the preset oil pressure calibration value table corresponding to the current gear is a corresponding relation table of the engine speed, the engine output torque and the oil pressure calibration value under the current gear;
Step two, when the accelerator is stepped down, keeping the actual oil pressure of the locking clutch unchanged until the engine speed is greater than or equal to a second speed threshold corresponding to the current gear, controlling the actual oil pressure of the locking clutch to rise, and then executing step three; wherein, the second rotation speed threshold corresponding to the current gear is larger than the first rotation speed threshold corresponding to the current gear;
And thirdly, when the actual oil pressure of the lockup clutch is equal to the required oil pressure of the lockup clutch, the control is exited.
2. The control method for preventing low-speed accelerator pedal drag according to claim 1, characterized by:
The slope of the actual oil pressure rise of the lockup clutch is as follows: dividing the difference between the required oil pressure of the lock-up clutch and the actual oil pressure of the lock-up clutch at the moment when the accelerator is stepped on by the calibration time; the calibration time is obtained by inquiring a preset calibration time table according to the current gear, wherein the preset calibration time table is a corresponding relation table of the gear and the calibration time.
3. The control method for preventing low-rotation-speed accelerator pedal drag according to claim 1 or 2, characterized by: in the preset oil pressure calibration value table corresponding to the current gear, the lower the engine speed is, the smaller the oil pressure calibration value is, and the minimum oil pressure calibration value is larger than or equal to the standby pressure of the lock-up clutch filled with oil.
4. The control method for preventing low-rotation-speed accelerator pedal drag according to claim 1 or 2, characterized by:
The first rotation speed threshold value corresponding to the current gear is obtained by: inquiring a preset first rotation speed threshold value table according to the current gear to obtain a first rotation speed threshold value corresponding to the current gear; the preset first rotation speed threshold value table is a corresponding relation table of gear and a first rotation speed threshold value;
the second rotation speed threshold corresponding to the current gear is obtained by: inquiring a preset second rotation speed threshold value table according to the current gear to obtain a second rotation speed threshold value corresponding to the current gear; the preset second rotating speed threshold value table is a corresponding relation table of gear and a second rotating speed threshold value.
5. The control method for preventing low-rotation-speed accelerator pedal drag according to claim 1 or 2, characterized by: the n=3.
6. The utility model provides a prevent that low rotational speed from stepping on throttle and dragging control system who keeps off, includes controller, its characterized in that: the controller being programmed to perform the control method according to any one of claims 1-5.
7. A vehicle, characterized in that: comprising a control system according to claim 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310000230.7A CN115962280B (en) | 2023-01-02 | 2023-01-02 | Control method and system for preventing low-rotation-speed accelerator stepping and gear dragging and vehicle |
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| CN202310000230.7A CN115962280B (en) | 2023-01-02 | 2023-01-02 | Control method and system for preventing low-rotation-speed accelerator stepping and gear dragging and vehicle |
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| CN115962280A CN115962280A (en) | 2023-04-14 |
| CN115962280B true CN115962280B (en) | 2024-08-02 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695712A (en) * | 2017-10-20 | 2019-04-30 | 上海汽车集团股份有限公司 | The locking control method and latching control device of lock-up clutch |
| CN113847423A (en) * | 2021-09-29 | 2021-12-28 | 柳州赛克科技发展有限公司 | Starting control method and system for hydraulic torque converter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY188635A (en) * | 2015-10-23 | 2021-12-22 | Nissan Motor | Vehicle lock-up control method and control device |
| CN110242743B (en) * | 2018-03-09 | 2021-01-22 | 上海汽车集团股份有限公司 | Control method and control system of hydraulic torque converter |
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- 2023-01-02 CN CN202310000230.7A patent/CN115962280B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695712A (en) * | 2017-10-20 | 2019-04-30 | 上海汽车集团股份有限公司 | The locking control method and latching control device of lock-up clutch |
| CN113847423A (en) * | 2021-09-29 | 2021-12-28 | 柳州赛克科技发展有限公司 | Starting control method and system for hydraulic torque converter |
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