JPH06143993A - Air conditioner control device when vehicle is decelerated - Google Patents

Abstract

PURPOSE:To improve the brake feeling by making the stepping force when an air conditioner is on and a vehicle is decelerated to be approximately equal to the stepping force when the air conditioner is off and the vehicle is decelerated. CONSTITUTION:A brake booster to reduce the stepping force of a brake when a vehicle is decelerated by employing the sucked tube pressure of the engine mounted on the vehicle is provided, and a control part to control so that the specified sucked tube pressure may be secured by turning off the air conditioner when the prescribed conditions are established when the air conditioner is on and the vehicle is decelerated is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deceleration air conditioner control device, and more particularly to a deceleration air conditioner control device for a vehicle equipped with an air conditioner for performing air conditioning in the vehicle.

[0002]

2. Description of the Related Art In an intake system that introduces intake air from an engine, a step motor driven by energization / de-energization is used to force the intake throttle valve to open / close to change the throttle opening when the engine is idle. Some are equipped with a deceleration control device having a certain throttle motor (DC motor). In this deceleration control device, the throttle opening is adjusted by the expansion and contraction of the plunger of the throttle motor during deceleration. The movement of the throttle motor is controlled by the controller.

Further, at the tip of the throttle motor,
An idle switch that turns on and off is provided to detect idle operation of the engine. Further, the throttle opening during idle operation is input to the control unit from a throttle opening sensor provided on the opposite side of the throttle lever. The throttle motor is controlled only when the idle stitch is on.

Further, as a method for controlling an automobile air conditioner, as disclosed in Japanese Patent Laid-Open No. 2-175417,
The idling speed increasing device for increasing the idling speed of the engine by controlling the opening / closing of the throttle valve of the car engine, and the switching means in the energizing circuit to the magnet clutch for transmitting the power from the engine to the compressor of the car air conditioner The switching means provided in the energization circuit for the idle speed increasing device is connected in series with an air conditioner switch for turning on and off the air conditioner for automobiles, detects the evaporator temperature, and turns off when the evaporator temperature becomes equal to or lower than a predetermined temperature. When any one of the air conditioner thermoswitch is turned off, it is turned off, and the switching means provided in the energizing circuit to the magnet clutch is turned off when either the air conditioner switch or the air conditioner thermostat is turned off. There engine speed detected by the time was reduced to the normal idle speed near, or either the air conditioner switch or air conditioning thermoswitch there is that so as to turn off operated from turned off after a predetermined time has elapsed.

[0005]

By the way, in the conventional engine, the intake negative pressure, which is the intake pipe pressure of the engine, is taken into the brake booster, and the suction negative pressure reduces the pedal effort on the brake pedal during deceleration. ing.

Further, when the air conditioner is turned on, a load is applied to the engine, so that the suction negative pressure of the engine becomes smaller than that when the air conditioner is turned off, as shown in FIG. As described above, when the air conditioner is on, the suction negative pressure applied to the brake booster was also small.

As a result, when the air conditioner is on and decelerating, a larger pedaling force is required than when the air conditioner is off and decelerating, and the air conditioner is on when compared to the brake feeling when the air conditioner is off. The brake feeling at that time was aggravated, which was a disadvantage in terms of practical use.

[0008]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention relates to an air conditioner device for a vehicle equipped with an air conditioner for achieving air conditioning in the vehicle, and incorporates the intake pipe pressure of an engine mounted in the vehicle. By providing a brake booster that reduces the pedal effort of the brake during deceleration,
A control unit is provided for controlling the air conditioner to be turned off to ensure a predetermined intake pipe pressure when a predetermined condition is satisfied when the air conditioner is turned on and when the vehicle is decelerated.

[0009]

According to the invention as described above, when the predetermined condition is satisfied when the air conditioner is on and when the vehicle is decelerating, the controller turns off the air conditioner to secure the intake pipe pressure to be taken into the brake booster. There is.

[0010]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 show an embodiment of the present invention. In FIG. 2, 2 is an engine, 4 is an intake passage,
6 is an exhaust passage.

The intake passage 4 of the engine 2 has an air cleaner 8 and a throttle body 10 which are sequentially connected from the upstream side.
And the intake manifold 12. A throttle valve 14 is provided in the intake passage 4 in the throttle body 10.

The exhaust passage 6 of the engine 2 is formed by an exhaust manifold 16, a catalytic converter 18 and an exhaust pipe 20 which are sequentially connected from the upstream side. A catalyst body 22 is provided in the exhaust passage 6 inside the catalytic converter 18.

The engine 2 is equipped with a number of fuel injection valves 24 (not shown) corresponding to the number of cylinders for each cylinder. The fuel injection valve 24 is connected to a fuel tank 28 by a fuel supply passage 26. A fuel pump 30 is provided in the fuel tank 28. The fuel to be pumped by the fuel pump 30 is dust-removed by the fuel filter 32 and is distributed and supplied to the fuel injection valve 24 by the fuel supply passage 26.

A fuel pressure adjusting section 34 for adjusting the pressure of the fuel is provided in the middle of the fuel supply passage 26. The fuel pressure adjusting unit 34 includes the pressure guiding passage 3 communicating with the intake passage 4.
The fuel pressure is adjusted to a constant value by the intake pressure introduced from 6, and excess fuel is supplied to the fuel tank 2 through the fuel return passage 38.
Return to 8.

The fuel tank 28 is provided in communication with the intake passage 4 of the throttle body 10 by a vaporized fuel passage 40, and a canister 42 is provided in the middle of the vaporized fuel passage 40.
Is installed. Further, a bypass passage 44 that bypasses the throttle valve 14 of the throttle body 10 and communicates with the intake passage 4 is provided, and an air bypass valve 46 is provided in the middle of the bypass passage 44. The air bypass valve 46 is provided for the bypass passage 4 when the idling speed needs to be adjusted at the time of starting, at a high temperature, or when the electric load increases.
By opening and closing 4, the amount of air is increased or decreased to stabilize the idle speed.

The fuel injection valve 24 and the air bypass valve 46 are connected to a controller 48. The control unit 48 includes a distributor 50 and a throttle valve 14
An opening sensor 52, a water temperature sensor 54, an ignition coil 56, a brake switch 58, an air conditioner sensor 60, a vehicle speed sensor 62, and an idle switch 64 are connected to each other.

Further, a brake booster 66 for reducing the pedaling force of the brake during deceleration by taking in the intake pipe pressure of the engine 2 is provided, and when a predetermined condition is satisfied when the air conditioner (A / C) is turned on and the vehicle is decelerated. The air conditioner (A
/ C) is turned off to control to secure a predetermined intake pipe pressure in the control unit 48.

More specifically, the brake booster 66 and a midway portion of the intake manifold 12 are connected to each other by a brake connecting pipe 68.

Further, the control unit 48 uses an air conditioner (A / C).
Is for performing the above-mentioned control only when is ON,
The air conditioner (A / C) is turned off only when the predetermined condition, for example, the idle switch 64 is on and the vehicle speed V is 1.0 〓 / h or more, that is, the air conditioner (A / C
C) is cut, and the air conditioner (A / C) is turned on when at least one of the above-mentioned predetermined conditions is not satisfied.

Reference numeral 70 is an oxygen sensor which is an exhaust sensor for detecting the oxygen concentration which is an exhaust component value provided in the exhaust passage 6, 72 is a battery, 74 is a fuse sensor, 76 is an alarm relay, 78 is a warning light, and 80 is a lamp. Is a PCV valve.

Next, the operation will be described with reference to the control flowchart of the air-conditioning control device during deceleration shown in FIG.

When the air conditioner (A / C) is turned on, the control program starts (102). Then, it is judged (104) whether or not the idle switch (IDL) 64 is on.

When the judgment (104) is NO, the routine returns to the start (102), and when this judgment (104) is YES, it is determined whether the vehicle speed V is 1.0 〓 / h or more. A decision (106) is made.

When the judgment (106) is NO, the routine returns to the start (102), and when the judgment (106) is YES, it is judged that all the predetermined conditions are satisfied and the air conditioner (A / Processing for cutting C) (108)
Are doing.

As a result, the pedaling force when the air conditioner (A / C) is on and when the vehicle is decelerating is approximately the same as the pedaling force when the air conditioner is off and the vehicle is decelerating due to the cutting action of the air conditioner (A / C). It is possible to improve the brake feeling, which is practically advantageous.

Further, since it can be dealt with only by changing the control program in the control section 48, there is no fear of complicating the structure, the cost can be kept low, and it is economically advantageous. Is.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, in the embodiment of the present invention, the condition for starting the control is determined by the ON state of the idle switch and the vehicle speed. However, for example, the operating state of the brake switch is added to the condition for starting the control. It is also possible to use it.

Further, in the above-mentioned embodiment, when one of the conditions for starting the control is not satisfied, the air conditioner (A /
Although C) is turned on, the air conditioner (A / C) may be configured to be used so that the turn-off time is continued for a predetermined time.

Further, in the above embodiment, the air conditioner (A / C) is turned off when the condition for starting the control is satisfied. However, the air conditioner (A / C) is repeatedly turned on and off at predetermined intervals. It can also be configured and used accordingly.

[0032]

As described in detail above, according to the present invention, a brake booster for reducing the pedal effort of the brake at the time of deceleration by taking in the intake pipe pressure of the engine mounted on the vehicle is provided. When a predetermined condition is satisfied during deceleration, the control part is provided to control the air conditioner to turn off and secure a predetermined intake pipe pressure.
The pedaling force when the air conditioner is on and when the vehicle is decelerating can be made approximately the same as the pedaling force when the air conditioner is off and the vehicle is decelerating by cutting the air conditioner. It is advantageous. In addition, since it can be dealt with only by changing the control program in the control unit, there is no fear that the configuration becomes complicated,
The cost can be kept low, which is economically advantageous.

[Brief description of drawings]

FIG. 1 is a control flow chart of a deceleration air conditioner control device showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of an air conditioner control device during deceleration.

FIG. 3 is a diagram showing a relationship between a negative pressure in an engine and time during deceleration showing a conventional technique of the present invention.

FIG. 4 is a diagram showing a relationship between negative pressure in a master cylinder and time during deceleration.

[Explanation of symbols]

 2 engine 4 intake passage 6 exhaust passage 12 intake manifold 24 fuel injection valve 48 control unit 52 opening sensor 54 water temperature sensor 58 brake switch 60 air conditioner sensor 62 vehicle speed sensor 64 idle switch 66 brake booster 68 brake connecting pipe

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[Procedure amendment]

[Submission date] January 19, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Figure 3]

[Figure 4]

[Fig. 2]

Claims (1)

[Claims] 1. An air conditioner device for a vehicle equipped with an air conditioner for achieving air conditioning in a vehicle, comprising a brake booster for taking in an intake pipe pressure of an engine mounted on the vehicle to reduce a pedal effort of a brake during deceleration. An air conditioner control device during deceleration, comprising a control unit for controlling to turn off the air conditioner to secure a predetermined intake pipe pressure when a predetermined condition is satisfied during on-operation and during deceleration of the vehicle.