JPH08230450A - At-deceleration time control device of internal combustion engine - Google Patents

Abstract

PURPOSE: To generate a satisfactory sense of deceleration by controlling so that the air conditioner is stopped when the two conditions are met simultaneously. i.e., the condition that the degree of throttle opening is for idling when the air conditioner is in operation and that the suction negative pressure is larger than the set value. CONSTITUTION: In case an air conditioner compressor 4 is being driven while the car is running, a control means 8 judges whether or not the degree of throttle opening sensed by a throttle sensor 34 is identical to the opening for idling. If Yes, judgement is made whether the suction negative pressure is larger than the set value--if No, the compressor 4 is driven, and if Yes. It is stopped. Thereby the internal combustion engine gets rid of the load resulting from the drive of the compressor 4 at the time of deceleration, and the suction negative pressure is heightened, and the stamping force of a brake pedal is reduced through a brake booster mechanism 10 to which the heightened negative pressure has been introduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deceleration control system for an internal combustion engine, and more particularly, to a control system for reducing intake negative pressure introduced into a brake booster mechanism during deceleration when driving an air conditioning system. When the air conditioner is driven, the brake pedal depressing force when decelerating while driving the air conditioner can be made equal to the stepping force when the air conditioner is stopped. The present invention relates to a deceleration control device for an internal combustion engine, which is capable of obtaining a sufficient deceleration feeling.

[0002]

2. Description of the Related Art Some vehicles are provided with an air conditioner (air conditioner: A / C) driven by an internal combustion engine installed therein. This air conditioner drives an air conditioning compressor by the driving force of an internal combustion engine.

Some vehicles are provided with a brake booster mechanism for reducing the depression force of the brake pedal by introducing intake negative pressure of the internal combustion engine. The brake booster mechanism is arranged between the brake pedal and the brake master cylinder, and increases the pedaling force of the brake pedal by using the intake negative pressure of the internal combustion engine to transmit it to the brake master cylinder. Reduce the stepping force of.

As such a brake booster mechanism, there is one disclosed in JP-A-4-219438. What is disclosed in this publication is that a throttle valve is provided in a common intake passage of an internal combustion engine, and an opening / closing valve that is closed at a low load is provided in an independent intake passage communicating with each cylinder. A brake booster mechanism for introducing an intake negative pressure between the two is provided, and when the deceleration state is detected by depressing the brake pedal, the opening / closing valve is opened to sufficiently secure the braking force increasing action of the brake booster mechanism. Is.

[0005]

By the way, as shown in FIG. 5, the intake negative pressure Pb of the internal combustion engine is set such that the air conditioner is driven (A / C: ON) and the air conditioner is stopped (A / C: OF).
It is different in F). When operating the air conditioner (A /
The intake negative pressure PbON of (C: ON) is the intake negative pressure Pb when the air conditioner is stopped (A / C: OFF) due to the load that drives the air conditioning compressor applied to the internal combustion engine.
It becomes weaker than OFF. Therefore, when the air conditioner is driven (A / C: ON), a weak intake negative pressure PbON is introduced into the brake booster mechanism.

Therefore, during deceleration of the vehicle when the air conditioner is driven (A / C: ON), a weak intake negative pressure PbON is introduced into the brake booster mechanism,
It becomes difficult to secure the intake negative pressure PbBL required for deceleration, and there is a disadvantage that the brake pedal must be depressed greatly. As a result, when decelerating when the air conditioner is driven (A / C: ON), a larger stepping force is required than when decelerating when the air conditioner is stopped (A / C: OFF). As a result, there is an inconvenience that a sufficient feeling of deceleration cannot be obtained.

[0007]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides an air conditioner driven by an internal combustion engine mounted on a vehicle and adjusts an intake amount of the internal combustion engine. And a pressure sensor for detecting the intake negative pressure are provided in a brake booster mechanism for introducing the intake negative pressure of the internal combustion engine to reduce the depression force of the brake pedal. When a condition that the throttle opening is an idle opening and a condition that the intake negative pressure is stronger than a set value are both satisfied during driving, the control means for controlling to stop the air conditioner is provided. Characterize.

[0008]

According to the structure of the present invention, the control device during deceleration is
When the control means satisfies both the condition that the throttle opening is the idle opening when the air conditioner is driven and the condition that the intake negative pressure introduced into the brake booster mechanism is stronger than the set value, the air conditioner is turned on. Since it is during deceleration when driving, it is possible to reduce the load on the internal combustion engine and increase the intake negative pressure to the intake negative pressure when the air conditioner is stopped by controlling the air conditioner to stop. , This increased intake negative pressure can be introduced into the brake booster mechanism.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. In FIG. 1, 2 is an air conditioner (A / C) provided in a vehicle (not shown), 4 is an air conditioning compressor (A / C compressor) driven by an internal combustion engine (not shown) mounted in the vehicle, and 6 is A deceleration control device, 8 is a control means. The air conditioning compressor 4 of the air conditioning device 2 is connected to the output side of the control means (A / C modulator) 8 that constitutes the deceleration control device 6.

The vehicle is provided with a brake booster mechanism 10 for introducing an intake negative pressure of an internal combustion engine to reduce the depression force of a brake pedal (not shown). The brake booster mechanism 10 includes a booster body 12 as shown in FIG.
A partition wall 14 divides the first chamber 16 and the second chamber 18 into a valve operating rod 20 that communicates with the brake pedal, and a booster air valve 22 provided at the end of the valve operating rod 20 on the second chamber 18 side and the partition wall 14 The reaction disk 24 and the booster piston 26 on the second chamber 18 side, the booster piston rod 28 on the first chamber 16 side of the partition wall 14 and the booster return spring 30 are provided.

The brake booster mechanism 10 applies a force when the brake pedal is depressed from the valve operating rod 20 through the booster air valve 22, the reaction disc 24, the booster piston 26, and the booster piston rod 28 to a master brake master (not shown). It is transmitted to the piston of the cylinder.

At this time, the brake booster mechanism 10 is
The second chamber 16 is blocked from the first chamber 16 to which the intake negative pressure is introduced by the booster air valve 22 and the atmosphere is introduced, and the force generated by the pressure difference between the first chamber 16 and the second chamber 18 is generated. The force of the brake master cylinder transmitted to the booster piston rod 28 by the booster piston 26, and the force generated by the pressure difference between the first chamber 16 and the second chamber 18 are combined with the force generated when the brake pedal is stepped on. To be transmitted to.

As a result, the brake booster mechanism 10
Reduces the pedaling force of the brake pedal by increasing the pedaling force of the brake pedal and transmitting it to the master cylinder for braking to generate high hydraulic pressure.

The brake booster mechanism 10 is provided with a pressure sensor 32 for detecting the intake negative pressure Pb introduced. The pressure sensor 32 is connected to the input side of the control means 8 of the deceleration control device 6.

The deceleration control device 6 also includes a throttle sensor 3 for detecting a throttle opening θ of a throttle valve (not shown) provided in the intake passage of the internal combustion engine for adjusting the amount of intake air.
4, a throttle full-open switch 36 for detecting that the throttle valve is fully open, and a vehicle speed sensor 38 for detecting the vehicle speed V of the vehicle.
4, the throttle fully open switch 36, and the vehicle speed sensor 38 are connected to the input side of the control means 8.

The deceleration control device 6 controls the control means 8 when the air-conditioning compressor 4 of the air-conditioning device 2 is driven and the throttle opening θ is the idle opening θi and the intake negative pressure introduced into the brake booster mechanism 10. Pb is the set value P
If both of the conditions that are stronger than bST are satisfied, it means deceleration when the air conditioning compressor 4 of the air conditioning device 2 is being driven.
Control to stop.

Next, the operation will be described.

As shown in FIG. 3, the deceleration control device 6 starts the control when the vehicle is operating (step 100),
When the air conditioning compressor 4 of the air conditioner 2 is driven (ON) (step 102), it is determined whether the throttle opening θ is the idle opening θi (step 104).

If this determination (step 104) is NO, the process returns to the process (step 102) of driving (ON) the air conditioning compressor 4.

If the determination (step 104) is YES, it is determined whether the intake negative pressure Pb is stronger than the set value PbST (step 106). Judgment (Step 10
In 6), the set value PbST is, for example, -300 m.
mhg is set, and it is determined whether the intake negative pressure Pb is −300 mmhg or less (Pb <−300 mmhg).

If this determination (step 106) is NO, the process returns to the process (step 102) of driving (ON) the air conditioning compressor 4.

If the judgment (step 106) is YES, it means that the air conditioning compressor 4 is being driven, and it is during deceleration. Therefore, the air conditioning compressor 4 is stopped (OF).
The process of F) (step 108) is performed, and the process returns to the determination (step 104).

As a result, in the internal combustion engine, the load due to the driving of the air conditioning compressor 4 of the air conditioner 2 is removed during deceleration, and the intake negative pressure Pb is reduced to the intake negative pressure when the air conditioning compressor 4 is stopped. Can be strengthened to PbOFF. This increased intake negative pressure PbOFF is introduced into the brake booster mechanism 10 to reduce the depression force of the brake pedal.

As described above, the deceleration control device 6 introduces the condition that the throttle opening θ is the idle opening θi and the brake booster mechanism 10 when the air conditioning compressor 4 of the air conditioner 2 is driven by the control means 8. Intake negative pressure P
If both of the conditions that b is stronger than the set value PbST are satisfied, it is during deceleration when the air conditioning compressor 4 of the air conditioning device 2 is being driven, so the air conditioning compressor 4 of the air conditioning device 2 is stopped. Control to do.

As a result, the deceleration control device 6 reduces the load on the internal combustion engine and reduces the intake negative pressure Pb during deceleration when the air conditioning compressor 4 of the air conditioning device 2 is driven, as shown in FIG. Intake negative pressure P when the air conditioning compressor 4 is stopped
The intake negative pressure Pb required for deceleration can be increased to bOFF.
_BL can be secured, and this increased intake negative pressure PbOFF can be introduced into the brake booster mechanism 10.

Therefore, the deceleration control device 6 controls the intake negative pressure Pb introduced into the brake booster mechanism 10 to the air conditioning compressor 4 during deceleration when the air conditioning compressor 4 of the air conditioning device 2 is being driven. It is possible to secure the intake negative pressure PbOFF equal to that when the air conditioning compressor 4 is stopped, and the depressing force of the brake pedal at the time of deceleration when the air conditioning compressor 4 is being driven when the air conditioning compressor 4 is stopped. It can be ensured to be equivalent to the stepping force, and a sufficient feeling of deceleration can be obtained.

Further, the deceleration-time control device 6 obtains a feeling of deceleration that is substantially the same when the air-conditioning compressor 4 is driven and when the air-conditioning compressor 4 is stopped. There is no change, a proper sense of deceleration can be secured, and usability can be improved.

Further, this deceleration-time control device 6 has a condition that the throttle opening θ is the idle opening θI and the intake negative pressure P.
By determining that it is during deceleration of the vehicle (not shown) when both of the conditions that b is stronger than the set value PbST are satisfied, it is possible to appropriately determine during deceleration when the air conditioning compressor 4 is driven. As a result, there is no risk of the air conditioning compressor 4 performing a drive / stop operation, and the reliability of control can be improved.

In the above-described embodiment, it is judged whether or not the throttle opening θ is the idle opening θI by the input of the signal of the throttle sensor 34. However, when the throttle valve is the idle opening θI, it is turned ON. The throttle opening θ is changed to the idle opening θ by inputting the signal of the idle switch.
You can also determine if it is I.

Further, the deceleration control device 6 has either one of the condition that the throttle opening θ is the idle opening θi and the condition that the intake negative pressure Pb introduced into the brake booster mechanism 10 is stronger than the set value PbST. If one of them is not satisfied, the air-conditioning compressor 4 is immediately released as the cancellation condition is satisfied.
Control to drive.

As a result, the deceleration control device 6 can improve the control reliability without fear that the air conditioning compressor 4 will be stopped for an unnecessarily long time during deceleration of the vehicle.

[0032]

As described above, according to the present invention, the deceleration control device controls the internal combustion engine by controlling the control means to stop the air conditioning device during deceleration when the air conditioning device is being driven. It is possible to reduce the load of (1) to increase the intake negative pressure to the intake negative pressure when the air conditioner is stopped, and this increased intake negative pressure can be introduced into the brake booster mechanism.

Therefore, the deceleration control device makes the intake negative pressure introduced into the brake booster mechanism during deceleration when driving the air conditioner equal to the intake negative pressure when the air conditioner is stopped. It is possible to secure the same depression force of the brake pedal when decelerating when driving the air conditioner as the depression force when the air conditioner is stopped.
It is possible to obtain a sufficient sense of deceleration.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a control device during deceleration showing an embodiment of the present invention.

FIG. 2 is a sectional view of a brake booster mechanism.

FIG. 3 is a flowchart of control of a deceleration control device.

FIG. 4 is a timing chart of vehicle speed, air conditioner, and intake negative pressure during deceleration.

FIG. 5 is a timing chart of vehicle speed, air conditioner, and intake negative pressure during deceleration of the related art.

[Explanation of symbols]

 2 Air Conditioner 4 Air Conditioning Compressor 6 Control Device at Deceleration 8 Control Means 10 Brake Booster Mechanism 32 Pressure Sensor 34 Throttle Sensor 36 Throttle Full Open Switch 38 Vehicle Speed Sensor

Claims (1)

[Claims] 1. An air conditioner driven by an internal combustion engine mounted on a vehicle, a throttle sensor for detecting a throttle opening of a throttle valve for adjusting an intake air amount of the internal combustion engine, and an intake air negative valve for the internal combustion engine. A pressure sensor that detects the intake negative pressure is provided in a brake booster mechanism that introduces pressure to reduce the depression force of the brake pedal, and when the air conditioner is driven, the throttle opening is the idle opening and the intake negative pressure. A deceleration control device for an internal combustion engine, comprising control means for controlling the air conditioner to be stopped when both conditions in which the pressure is stronger than a set value are satisfied.