JPH0220465A - Control device for vacuum pump motor for vehicle - Google Patents

Abstract

PURPOSE:To constrain noise generation and power consumption by turning OFF a motor driving power source despite of the operation of the switch of a vacuum pump driving motor until an engine is started by an engine start detecting means. CONSTITUTION:A constantly opening relay contactor 4 is provided for performing the drive control of a motor 2 driving a vacuum pump 1 used for an air pressure type brake booster in a diesel engine car, etc. having no negative pressure system and made freely workable by a transistor Tr1. An accessory switch 6 and a pressure switch 8 are provided in the space with a power source 3 and also a 2nd switch means connecting transistors Tr2, Tr3 to a tachogenerator 10 as for an engine start detecting means is provided. The motor driving is made OFF until the engine start even if each switch 6, 8 be turned ON, the motor driving prior to the engine start is prohibited and noise generation and power consumption are restrained.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] This invention is applicable to vehicles without a negative pressure system, such as electric vehicles and day vehicles.
The present invention relates to a vacuum pump motor control device used in a pneumatic one-way brake booster in a gas engine.

[Prior Art and Problems] In a conventional pneumatic brake bias device, for example, in Japanese Utility Model Application Publication No. 59-75578, a vacuum pump is driven by detecting the activation of a key switch to obtain negative pressure. Ta. However, since the travel drive system does not operate just by turning on the key switch, the operation of the vacuum cylinder 1 motor seems to be an issue. Also, when the vehicle is stopped, strong braking force is not necessary, and the vacuum pump is -9
By skipping these activities, I was wasting unnecessary mental energy.

The object of this invention is to
An object of the present invention is to provide a vacuum bomb motor control device for a vehicle that can suppress noise generation and power consumption.

[Means for solving the problem 1-1 This invention is II! 71 Tanabata for driving a bomb for generating negative pressure of the booster, and a Tanabata switching means for turning on and off the drive power of the motor;
The motor switching means is controlled in accordance with the consumption of negative pressure in the deterrence device to turn on and off the L-Y drive power source. control! The Ill device includes a start detection means for detecting the start of the travel drive source, and a state in which the motor drive power is turned off regardless of the operation of the motor drive switch until the travel drive source is started by the start detection means. The gist of the present invention is a vacuum pump septa-tactor control device for a vehicle, which is equipped with a second septa-ta switching means.

[Function 1] The second motor switching means turns off the motor drive power regardless of the operation of the motor drive switch until the travel drive source is started by the start detection means that detects the start of the travel drive source. state.

As a result, the motor will not be driven until the travel drive source is started.

[Embodiment 1] An embodiment in which the present invention is embodied in an automobile equipped with a diesel engine will be described below with reference to the drawings.

As shown in FIG. 1, a brake comb pump 1 for generating a brake booster is connected to a brake comb tank (not shown) and is driven by a pump eater (DC motor) 2. A normally open relay contactor 4 and the pump motor 2 are connected between both terminals of a battery 3 serving as a driving power source.
are connected in series. Further, between both terminals of the battery 3, relay coils 5 and N P N transistors r r 1 for opening and closing the relay contactor 4 are connected in four rows. This relay coil 5 has a diode D
1 are connected in parallel. The NPN transistor Tr1 and the relay coil 5 and 1 non-contactor 4 constitute a mortar switching means, and when the NPN transistor Trl turns on and off, the relay coil 5 is energized and demagnetized, and the relay contactor 4 is opened and closed. Then, the driving power for the pump L-2 is turned on and off.

Further, an accessory switch J- (hereinafter referred to as an AC switch) 6 and a fuse 7 are connected between both terminals of the battery 3.
, a PNP transistor Tr2 constituting a second motor switching means, a pressure switch 8 of -C serving as a motor drive switch, and a resistor r1°r2 are connected in series, respectively. Roughly speaking, the dark connection point a of resistors rl and r2 is the NPN! - It is connected to the base terminal of the transistor Tr1 as a signal input terminal. The ΔCC switch 6 closes the circuit when it is turned on, and the pressure switch 8 detects the pressure in the vacuum comb tank and turns on (closes the circuit) when the pressure in the comb tank becomes lower than a predetermined pressure. Also, i
jl A series circuit of a resistor r3 and a capacitor 9 is connected in parallel to the pressure switch 8.

The base terminal of the PNP transistor Tr2 and the buffer i
- A resistor r4 and an NPN transistor T constituting the second motor switching means are connected between the negative terminal of the
r3 are connected in series.

A resistor r5 is connected between the base terminal of the N P N +- transistor Tr3 and the negative terminal of the battery 3. r6, a diode D2, and a tachogenerator 10 as a start detection means are connected in series. This tacho generator 1
0 is provided on the rotating shaft of a diesel engine (not shown) as a traveling drive source, and detects starting of the diesel engine. That is, the power generation operation is performed by the rotation of the diesel engine, and the detected rotation is an idle rotation (for example, 500 rpm) or higher. Further, a flat rate capacitor 11 is connected between the connection point between the resistor r5 and the resistor r6 and the negative terminal of the battery 3.

Next, the operation of the overnight WJ device for a vehicle vacuum comb bomb constructed as described above will be explained.

Even if you turn on the ACC switch 6, it will still drive! J.J.
As long as the power supply (-1 engine) is not started ( ), the output voltage of the tacho generator 10 is zero<NPN transistor Tr3 remains off.

Then, when the engine starts, the tachogenerator 10
If there is an output voltage from N P N ) - Runsistor T
r3 is turned on. This turning on of the Nl-run transistor Tr3 turns on the PNPI-run transistor Tr2. When the PNP transistor Tr2 is turned on, the voltage of the battery 3 is charged to the capacitor 9 via the resistor r3. Then, when the 0 pressure becomes low by using the brake, the pressure switch 8 is turned on (closed), and when the pressure switch 8 is closed, the voltage L of the battery 3 is divided into voltages by the resistors rl and r2 through the switch 8. and the NPN transistor Tr1 is turned on. This N P N t-
When the run sister rrl is turned on, the relay coil 5 is excited, the relay contactor 4 is turned on (closed), and driving power is supplied from the battery 3 to the pump motor 2, so that the motor 2 is driven. As a result, the vacuum pump 1 operates to increase the negative pressure.

There is a negative pressure on all the sliding doors and the pressure switch 8 turns off (fit
l path), the period N during which the charging current of the capacitor 9 flows
As the PN transistor R1 continues to turn on, the negative pressure reaches a pressure even higher than the pressure switch 80 setting. As a result, it is possible to create an ijj 111 circuit in which the hysteresis width is adjusted with one pressure switch F8, and then 13 negative pressure G, 1: does not immediately drop to the set value of pressure switch 8 using 71 no-gi. , f! 1. Brake operation 2~
Pump 7-9 because pump 1 Tan-aba 2 operates once every 3 times.
2 and the life of the vacuum pump 1 can be increased.

In this way, in this embodiment, the tachogenerator 10
1. Until the diesel engine starts, the drive power to the pump motor 2 is turned off regardless of the operation of the Lt power switch 8. : PNP transistor 1- which does not lead to the state
Since A
If the cc switch 6 is turned on, the pump Tanabata 2 will not be driven (if the diesel engine is stopped, the pump motor 2 will not be driven), and the tachogenerator 10 will turn on the diesel engine, which has a lot of running power. When starting is detected and the generated voltage of the tachogenerator 10 is N P N
When the +- transistor T r 3 is driven, the pump motor 2 can be driven, and the traveling drive system is activated. When the background noise becomes loud (when the external environment becomes noisy),
The vacuum pump motor is driven so you don't have to worry about the VJ noise. At the same time, power consumption by the pump motor 2 can be suppressed.

Note that this invention is not limited to the above embodiments,
It may also be implemented as shown in FIG. Incidentally, in explaining this FIG. 2, the same reference numerals are used to denote the same components as in the following embodiment, and the explanation thereof will be omitted.

That is, a resistor r7 and a zyristor 12 constituting the second motor switching means are connected in series between the PNPt-run transistor Tr2 and the negative terminal of the battery 3. Further, between both terminals of the battery 30, there is a starter motor start switch 13 as a first stage of start detection, and a resistor r8. r
9 are connected in series, and the connection point C between both resistors rB and rg is connected to the gate end of the iris register 12, which will be described below.

After the ΔCC switch 6 is turned on, the beam iris 12 is not turned on and the PNP transistor Tr2 is not turned on until the starter motor starting switch 13 is turned on (closed). Therefore, the pump 1-tor 2 is ready for operation after the diesel engine is started.

In addition, in each of the above embodiments, the relay contactor 4, the relay coil 5, the NPN transistor 1 and the drive power of the ribbon motor 2 are turned on and off, but the pump motor 2 and the transistor 1 are connected between both terminals of the battery 3. The semiconductor switching means may be connected in series, and the drive power to the pump motor may be turned on and off by the switching operation of the semiconductor switching means.

[Effects of the Invention] As described in detail above, the present invention exhibits an excellent effect of suppressing noise generation and power consumption caused by a vacuum pump overnight.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram of a vehicle vacuum pump motor control device embodying the present invention, and FIG. 2 is an electrical circuit diagram of another example of a vehicle vacuum pump motor control device. 1 is a vacuum pump, 2 is a pump motor, 3 is a valve as a driving power source, 4 is a non-contactor that constitutes a switching means, 5 is a relay coil that is a motor switching means, and 8 is a switch for driving a motor. Trl is an NPN transistor that constitutes the motor switching means, Tr2 is a PNP transistor that constitutes the second motor switching means, T
r3 constitutes the second motor switching means N l
)N +- transistor. Patent applicant Nippondenso Co., Ltd.

Claims (1)

[Scope of Claims] 1. A motor that drives a vacuum pump for generating negative pressure in the brake booster; a motor switching means that turns on and off the driving power of the motor; A vacuum pump motor control device for a vehicle, comprising a motor drive switch that controls the motor switching means to turn on and off the motor drive power according to consumption, comprising: a start detection means for detecting start of a travel drive source; A vehicular vacuum characterized by comprising: a second motor switching means that turns off the motor drive power regardless of the operation of the motor drive switch until the travel drive source is started by the start detection means. Pump motor control device.