JPH0711989A - Auxiliary machine drive device for automobile - Google Patents

Abstract

PURPOSE:To prevent the worsening of a brake sensation owing to reduction of a suction negative pressure by a method wherein the load of the auxiliary machine of an engine and the deceleration time of a vehicle at which a throttle valve is in an idle position are respectively detected and during deceleration wherein a load exceeds a given value, the load of the auxiliary machine is decreased. CONSTITUTION:Intake air is introduced by an auxiliary air amount control valve 59 in a manner that the intake air is caused to bypass a throttle valve 60 to regulate an intake air amount of an engine 41. An auxiliary air amount control valve 59 is controlled by means of a number of idle revolutions control means 4. Meanwhile, a hydraulic motor 2 is driven by means of working oil from a hydraulic pump 1 driven by an engine 41 and an auxiliary machine 3 is driven with the aid of a hydraulic motor 2. In this constitution, the load of an auxiliary machine 3 is detected by a detecting means 5. Further, a deceleration time of a vehicle at which the throttle valve 60 is in an idle position is detected by a different detecting means 6. During deceleration wherein a load exceeds a given value, the load of the auxiliary machine is decreased by means of a control means 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for hydraulically driving an auxiliary machine of an engine.

[0002]

2. Description of the Related Art As a conventional hydraulic auxiliary machine drive, for example, there is one shown in FIG.
No. 8, gazette).

To explain this, the cooling fan 79
The control device 80 includes a hydraulic motor 71 that rotationally drives the engine, a hydraulic pump 72 that is driven by the engine 70, and a circuit 76 that circulates hydraulic oil that is discharged from the hydraulic pump 72 to the hydraulic motor 71. The detection signal of the temperature sensor 75 is input, the flow rate of the hydraulic oil supplied to the hydraulic motor 71 via the flow rate control valve 74 is adjusted, and the rotation speed of the hydraulic motor 71 is controlled according to an operating state.

[0004]

The engine 70 for an automobile is provided with an auxiliary air amount control valve that guides intake air by bypassing a throttle valve that adjusts the intake air amount, and controls the idle speed of the engine 70. The opening of the auxiliary air amount control valve is controlled so as to approach the target value. This control device increases the air amount by the auxiliary air amount control valve to increase the air amount by the auxiliary air amount control valve when the load of the hydraulic motor 71 is increased or when the engine 70 is operating in the position where the automatic transmission is in the traveling range. Is controlled.

However, in the engine 70 for an automobile, the suction negative pressure generated on the downstream side of the throttle valve of the intake pipe is used as the negative pressure source of the brake booster. When the load of 71 increases or the control of opening the auxiliary air control valve is performed as the position of the automatic transmission shifts from the neutral range to the travel range, the intake pipe guided from the intake pipe to the master back of the brake booster. There was a possibility that the negative pressure would decrease and the braking performance would feel uncomfortable.

In view of the above problems, the present invention has an object to provide an auxiliary machine drive device for an automobile which does not give an uncomfortable feeling to the braking performance.

[0007]

The invention according to claim 1 is
As shown in FIG. 1, an auxiliary air amount control valve 59 that guides intake air by bypassing a brake booster 65 that uses an intake negative pressure of the engine 41 as a drive source and a throttle valve 60 that adjusts the intake air amount of the engine 41. And means 4 for detecting the opening of the throttle valve 60, means 4 for controlling the opening of the auxiliary air amount control valve 59 so that the idle speed of the engine 41 approaches a target value, and the engine 41 is driven. In an accessory drive device for a vehicle, which includes a hydraulic pump 1, a hydraulic motor 2 driven by hydraulic oil sent from the hydraulic pump 1, and an accessory 3 driven by the hydraulic motor 2, a load of the accessory 3 is provided. And a means 6 for detecting when the vehicle whose throttle valve 60 is in the idle position during deceleration travel, and a means for detecting the auxiliary equipment during deceleration travel when the load of the auxiliary machine 3 exceeds a predetermined value. And a control unit 7 for reducing the dynamic load.

According to a second aspect of the present invention, as shown in FIG. 2, the means 9 for detecting the position of the automatic transmission of the vehicle and the drive load of the auxiliary machine 3 at the time of deceleration traveling in which the position of the automatic transmission is within the traveling range. And control means 10 for decreasing the number.

[0009]

In the invention described in claim 1, when the control for forcibly reducing the load of the auxiliary machine 3 is performed during deceleration traveling, the opening degree of the auxiliary air amount control valve 59 is reduced to reduce the idling speed. By performing the control, the suction negative pressure guided to the brake booster 65 does not decrease, and it is possible to prevent the feeling of braking from being uncomfortable.

In the second aspect of the present invention, the opening of the auxiliary air amount control valve 59 can be reduced by performing control to reduce the drive load of the auxiliary machine 3 during decelerating travel when the position of the automatic transmission is in the travel range. Then, control is performed to reduce the idle speed, and while preventing the operation of the engine 41 from being stopped due to the load of the automatic transmission, the suction negative pressure introduced to the brake booster 65 is reduced and the braking performance is reduced. It is possible to prevent a feeling of strangeness from being given.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings.

In FIG. 3, 41 is an engine body mounted on an automobile, 42 is an intake passage, 43 is an exhaust passage, 44
Is an intake valve, 45 is an exhaust valve, 47 is a fuel injection valve for injecting fuel into the intake passage 2, and 48 is a spark plug for igniting the air-fuel mixture in the combustion chamber 49.

The control device 51 inputs a signal QA from an air flow meter 52 for detecting the intake air amount and a signal NE from a rotation speed sensor 53 for detecting the engine rotation speed, and injects fuel in accordance with these engine operating conditions. The fuel injection amount from the valve 47 is controlled, and the ignition timing of the ignition device 50 that ignites the spark plug 48 is controlled.

In order to perform feedback control of the idle speed to a target value, a bypass passage 58 that bypasses the throttle valve 60 that adjusts the intake air amount is provided, and an auxiliary air amount control valve 59 is provided in the bypass passage 58.

The control device 51 includes an idle switch 5 for detecting that the throttle valve 60 is in the idle position.
7, a signal ID from 7, a signal TW from a water temperature sensor 54 that detects the engine cooling water temperature, a signal AC from an air conditioner switch 61 that detects the load of the air conditioner compressor 13 described later, and a neutral switch that detects the position of the automatic transmission of the vehicle. Signals TM from 62 are input respectively, and when the engine is warmed up, when the load of the air conditioner is increased, or when the automatic transmission shifts from the neutral range to the running range, the auxiliary air amount control valve 59 is used. The amount of intake air is increased to increase the torque generated during idle operation of the engine.

When the automatic transmission is in the traveling range where the neutral switch is off, the driving force of the engine 41 is transmitted to the wheels via the hydraulic torque converter.

In FIG. 3, reference numeral 65 is a vehicle brake booster. This brake booster 65 is provided in the intake passage 4
The suction negative pressure generated on the downstream side of the second throttle valve 60 is guided to the chamber 68 of the master back 67, while the master back 67 is depressed by depressing the brake pedal 66.
Atmosphere is sent to the chamber 69 of No. 6, and the hydraulic piston 64 that operates due to the pressure difference in both chambers 68 and 69 enhances the hydraulic pressure from the master cylinder 63 that interlocks with the brake pedal 66 and guides the hydraulic pressure to each wheel cylinder (not shown) It is like this.

As shown in FIG. 4, the hydraulic pump 1 directly driven by the engine 41 via the belt 29 and the pulley.
2, 22, hydraulic motors 11 and 21 driven by hydraulic oil sent from the hydraulic pumps 12 and 22, an air conditioner compressor 13 and an alternator (generator) 23 driven by the hydraulic motors 11 and 21, respectively. Be prepared.

The air conditioner compressor 13 has a function of compressing a refrigerant gas for cooling the vehicle interior, and has a function of varying the compressor capacity according to the required cooling capacity.

Oil tank 19 and each hydraulic pump 12, 2
2, an inlet passage 20 connecting the suction sides of the two hydraulic pumps 12,
Supply passages 14 and 24 connecting the discharge side of 22 to the hydraulic motors 11 and 21 and return passages 15 and 25 connecting the outlet side of the hydraulic motors 11 to the oil tank 16 are provided. By circulating, the hydraulic motor 11 rotates.

A flow control valve 17 is provided in a passage 16 that bypasses the hydraulic motor 11 and connects the supply passage 14 and the return passage 15. The control device 30 adjusts the flow rate of the hydraulic oil supplied to the hydraulic motor 11 via the flow rate control valve 17 to control the rotation speed of the air conditioner compressor 13. Control device 30
By inputting an air conditioner switch 31 for instructing the operation of the air conditioner, the rotation speed and the compressor capacity of the air conditioner compressor 13 are controlled to obtain the desired cooling capacity.

By the way, in the automobile engine 41, the suction negative pressure generated on the downstream side of the throttle valve 60 in the intake passage 42 is used as a drive source for the brake booster 65. When the opening degree of the auxiliary air amount control valve 59 increases as the driving load of the alternator 23 increases, the negative pressure introduced from the intake passage 42 to the master back chamber 68 of the brake booster 65 decreases, and the braking performance is reduced. May give a feeling of strangeness to the feeling.

In order to deal with this, the control device 30 inputs the detection signals of the idle switch 57 and the vehicle speed sensor 33 for detecting the vehicle speed to detect the decelerated running of the vehicle, while the downstream side of the throttle valve 60. Switch 32 for detecting suction negative pressure generated in the vehicle, brake booster 6
5, a pressure switch for detecting the pressure introduced into the master back chamber 68 of 5 or a pressure switch for detecting the braking hydraulic pressure is input to detect the load of the air conditioner compressor 13 or the alternator 23, Control is performed to forcibly reduce the load of the compressor 13 for the air conditioner or the alternator 23 during deceleration traveling in which the load of these accessories is large.

In this way, the control device 30 controls the air conditioner compressor 13 or the alternator 2 during deceleration.
When the control for forcibly reducing the load of No. 3 is performed, the control device 51 closes the auxiliary air amount control valve 59 and performs control for lowering the idling speed, so that the brake booster 65 from the intake passage 42 is controlled. The negative pressure introduced to the master bag 67 does not decrease, and it is possible to prevent the feeling of braking from being uncomfortable.

Further, the control device 30 inputs a signal from the neutral switch 62 for detecting the position of the automatic transmission of the vehicle, and loads the load on the air conditioner compressor 13 or the alternator 23 at the time of deceleration traveling when the automatic transmission is in the traveling range. Performs control to forcibly decrease.

As described above, when the automatic transmission is in the traveling range and the vehicle is decelerated, the load of the air conditioner compressor 13 or the alternator 23 is forcibly reduced, and the engine 41 stops operating. In addition to the prevention, the control device 51 closes the auxiliary air amount control valve 59 to perform control to reduce the idle speed, thereby reducing the suction negative pressure introduced from the intake passage 42 to the master back 67 of the brake booster 65. It is possible to prevent the feeling of braking from being uncomfortable.

The control for reducing the load on the auxiliary machinery is performed by reducing the capacity of the air conditioner compressor 13, reducing the flow rate of the working oil supplied to the hydraulic motor 11 via the flow rate control valve 17, or Control is performed to reduce the power generation amount of the alternator 23.

The flow chart of FIG. 5 shows a control program executed by the control unit 30 for forcibly reducing the load on the auxiliary machinery at the time of deceleration of the vehicle, which is executed at regular time intervals.

To explain this, first, step 1
It is determined based on the detection signal of the pressure switch 32 whether or not the load of the auxiliary equipment represented by the suction negative pressure exceeds a predetermined value, and it is determined in step 3 that the idle switch 57 is ON during idle operation. , Speed sensor 3 in step 5
If it is determined based on the detection signal of No. 3 that the vehicle speed does not become substantially zero, the routine proceeds to step 6 and control for forcibly reducing the load of the air conditioner compressor 13 or the alternator 23 is performed.

On the other hand, when the load of the auxiliary machine is smaller than the predetermined value, or when the idle switch 57 is turned off and the throttle valve 60 is opened, the routine proceeds to steps 2 and 4 and the air conditioner compressor 13 is executed. Alternatively, the load on the alternator 23 is maintained.

When the speed of the vehicle is close to zero and it is determined that the automatic transmission is in the traveling range based on the signal from the neutral switch 62, control is performed to reduce the load on the auxiliary equipment, and the operation of the engine 41 is performed. While preventing engine stalls that stop (Step 9,
10) If it is determined that the automatic transmission is in the neutral range, the load on the auxiliary machine is not reduced (steps 9 and 11).

Incidentally, in steps 6 and 8, the control for forcibly reducing the load on the air conditioner compressor 13 or the alternator 23 may be controlled by a timer so that it is performed for a predetermined time.

Further, a brake switch for directly detecting the operation of the brake device may be provided as a means for detecting the deceleration of the vehicle.

Next, in another embodiment shown in FIG. 6, two hydraulic pumps 35 and 36 driven directly by the engine 41 are used.
Is a radial piston pump or a variable flow rate pump.

The control device 37 adjusts the discharge flow rate of the hydraulic pumps 35 and 36 to a predetermined value regardless of the rotation speed of the engine 41, and controls the rotation speed of the air conditioner compressor 13 or the alternator 23.

In this case as well, the control device 37 inputs the detection signals of the idle switch 57 and the vehicle speed sensor 33 to detect when the vehicle is decelerating, and at the same time, detects the suction negative pressure generated on the downstream side of the throttle valve 60. By inputting the detection signal of the pressure switch 32 for detection, the load of the air conditioner compressor 13 or the alternator 23 is detected, and the load of the air conditioner compressor 13 or the alternator 23 is detected during deceleration with a large load of these accessories. Performs control to forcibly decrease.

Further, the control device 30 inputs a signal from the neutral switch 62 for detecting the position of the automatic transmission of the vehicle, and loads the load on the air conditioner compressor 13 or the alternator 23 during deceleration traveling when the automatic transmission is in the traveling range. Performs control to forcibly decrease.

[0038]

As described above, the invention according to claim 1 bypasses the brake booster device which uses the intake negative pressure of the engine as a drive source and the throttle valve which adjusts the intake air amount of the engine to intake air. The auxiliary air amount control valve for guiding, a means for detecting the opening of the throttle valve, a means for controlling the opening of the auxiliary air amount control valve so that the idle speed of the engine approaches a target value, and the engine is driven. In an accessory drive device for a vehicle, which includes a hydraulic pump, a hydraulic motor driven by hydraulic oil sent from the hydraulic pump, and an accessory driven by the hydraulic motor, a means for detecting a load of the accessory, A means for detecting when the vehicle whose throttle valve is in the idle position during deceleration travel, and a control means for reducing the drive load of the auxiliary equipment during the deceleration travel of the vehicle when the load of the accessory exceeds a predetermined value Because with a without suction negative pressure is guided to the brake booster is lowered, it is possible to prevent discomfort to the braking of the feeling.

The invention according to claim 2 is provided with means for detecting the position of the automatic transmission of the vehicle, and control means for reducing the drive load of the auxiliary machine during deceleration traveling of the vehicle in which the position of the automatic transmission is within the traveling range. Therefore, it is possible to prevent the engine from stalling and prevent the feeling of braking from being uncomfortable.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to claims of the invention according to claim 1.

FIG. 2 is a diagram corresponding to claims of the invention according to claim 2;

FIG. 3 is a configuration diagram of an engine showing an embodiment of the present invention.

FIG. 4 is a configuration diagram of an accessory drive device.

FIG. 5 is a flowchart showing control contents of the control device.

FIG. 6 is a configuration diagram of an accessory drive device showing another embodiment.

FIG. 7 is a configuration diagram of an accessory drive device showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hydraulic motor 2 Hydraulic pump 3 Auxiliary equipment 4 Idle speed control means 5 Auxiliary load detection means 6 Vehicle deceleration running detection means 7 Control means for reducing load on auxiliary equipment 8 Throttle valve opening detection means 9 Automatic transmission Position detection means 10 control means for reducing the load of auxiliary equipment 30 control device 31 air conditioner switch 32 pressure switch 33 vehicle speed sensor 41 engine 57 idle switch 59 auxiliary air amount control valve 60 throttle valve 62 neutral switch 65 brake booster

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F02D 33/00 M 41/08 315 8011-3G

Claims (2)

[Claims] 1. A brake booster driven by an intake negative pressure of an engine as a drive source, an auxiliary air amount control valve for guiding intake air by bypassing a throttle valve for adjusting the intake air amount of the engine, and an opening of the throttle valve. Of the auxiliary air amount control valve so as to bring the idle speed of the engine closer to the target value, the hydraulic pump driven by the engine, and the hydraulic oil sent from the hydraulic pump. In an accessory drive device for an automobile that includes a driven hydraulic motor and an accessory that is driven by the hydraulic motor, a means for detecting the load of the accessory and a decelerating travel of the vehicle in which the throttle valve is in the idle position are provided. Auxiliary machine drive for an automobile, comprising: a detecting means; and a control means for reducing the drive load of the auxiliary machine when the vehicle is decelerated when the load of the auxiliary machine exceeds a predetermined value. apparatus. 2. A means for detecting a position of an automatic transmission of a vehicle, and a control means for reducing a drive load of an auxiliary machine when the vehicle is decelerated while the position of the automatic transmission is within a traveling range. The accessory drive device for an automobile according to claim 1.