JPH0791290A - Air conditioner controller - Google Patents

Abstract

PURPOSE:To operate a master bag even in an automobile provided with an engine having small displacement by disengaging the clutch in deceleration in the state where an air conditioner switch is turned on and returning the opening of an auxiliary air valve to the value at the time when the air conditioner switch is turned off. CONSTITUTION:An increasing means 60 increases the opening of an auxiliary air valve 58 when an intake throttle valve 57 is in the full closed position and also when an air conditioner switch 54 is turned on. When a sensor 61 detects the fact that the intake negative pressure becomes the value in high loading, and also when a judging means 62 judges deceleration, a connection stopping/ opening returning means 63 stops the connection of a clutch by a clutch connecting means 56 and returns the air valve opening by an air valve opening increasing means 60 to the value at the time when the air conditioner switch is turned off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner control device.

[0002]

2. Description of the Related Art In an air conditioner, its compressor is driven by an engine. Therefore, when the air conditioner operates during idling, the cooling capacity is improved by increasing the idling speed.

For this reason, when the air conditioner is operating, the idle speed is increased by increasing the opening degree of the auxiliary air valve provided in the passage bypassing the intake throttle valve by a certain amount. "Automotive Engineering" published by Japan Railway Company
See the February 1986 issue, page 114).

[0004]

By the way, the larger the automobile, the greater the braking force required to stop the automobile, and the greater the force with which the brake pedal is stepped on, the more the driver's fatigue increases. In order to reduce the driver's fatigue and to increase the braking force, a master bag that increases the force pushing the master cylinder piston is installed in front of the master cylinder. This masterback is
The suction negative pressure (intake pipe pressure downstream of the throttle valve) is used as a negative pressure source.

However, when the engine has a small displacement, the proportion of the air conditioner load acting on the engine output at the fully closed position of the throttle valve becomes maximum, so that the amount of auxiliary air bypassing the throttle valve must be increased, Due to this increase in the amount of auxiliary air, a sufficient suction negative pressure cannot be applied to the master bag, and the force on the brake increases.

Therefore, the present invention is to turn on the air conditioner switch.
When the vehicle is decelerating in this condition, the purpose is to disengage the clutch and return the opening of the auxiliary air valve to the value when the air conditioner switch is off, so that the master back can work even in a vehicle with a small displacement engine. And

[0007]

According to the present invention, as shown in FIG. 1, a master back 51 for boosting a braking force by utilizing a suction negative pressure higher than a predetermined pressure, an air conditioner compressor 52, and an engine are intermittently connected. Means 5 for determining whether the clutch 53 and the air conditioner switch 54 are ON
5, a means 56 for connecting the clutch 53 when the air conditioner switch 54 is ON, and a valve 58 for adjusting the amount of auxiliary air that bypasses the intake throttle valve 57 based on this determination result.
A means 59 for determining whether the intake throttle valve 57 is in the fully closed position, and the determination result shows that the intake throttle valve 57 is in the fully closed position and the determination result indicates that the auxiliary air is supplied when the air conditioner switch 54 is ON. A means 60 for increasing the opening degree of the valve 58, a sensor 61 for detecting that the suction negative pressure has reached a high load value, a means 62 for determining whether or not deceleration is occurring, and a deceleration based on this determination result. At this time and when the suction negative pressure becomes a value at the time of high load from the sensor detection value, the clutch connection by the clutch connecting means 56 is stopped and the air valve opening by the air valve opening increasing means 60 is changed to the air conditioner switch. A means 63 for returning to the OFF value is provided.

[0008]

The air valve opening is increased due to idle up during deceleration with the air conditioner switch turned on, which reduces the suction negative pressure. However, in engines with small displacement, this suction negative pressure decreases. Is larger than a large displacement engine, the suction negative pressure weakens to a value at high load where the master back does not work.

On the other hand, according to the present invention, when it is detected that the suction negative pressure has reached the value at the time of high load during deceleration, the clutch connection is stopped and the air valve opening is at the value when the air conditioner switch is OFF. Since it is returned to, the suction negative pressure becomes stronger and becomes the negative pressure at which the master bag works again.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 2, the negative pressure in the intake manifold 3 downstream of the throttle valve 1 is as shown in FIG.
It is introduced into the master bag 12 via.

In the master back 12, when the brake pedal 13 is not depressed, this negative pressure is guided to the chambers 12d and 12e on both sides of the power piston 12f in FIG. 4, and the power piston 12f is in the illustrated state.

When the brake pedal 13 is depressed from this state, the valve plunger 12b advances forward (left in FIG. 4) via the valve operating rod 12a, and the poppet valve 12c causes a negative pressure passage to the right chamber 12d. Will be closed and the atmosphere communication passage will be opened instead of this,
The atmosphere is sent to the right chamber 12d, and a difference between the negative pressure and the atmospheric pressure is generated in both chambers 12d and 12e. The force corresponding to this pressure difference is
In addition to the driver's stepping on the brake pedal 13,
The power piston 12f is further advanced, and the push rod 12g attached to the tip of the power piston 12f pushes the master cylinder piston 12h.

When the brake is no longer needed and the pedal 13 is released, the master cylinder spring 12i and the return spring 12j of the power piston are pushed by the push rod 1.
2g and the power piston 12f are pushed back. Further, when the valve plunger 12b returns to close the atmosphere communication passage and open the negative pressure passage in place of this, the negative pressure introduced to the right chamber 12d eliminates the pressure difference between the two chambers 12d and 12e, and the power piston 12f returns to the state before the operation, and the operation of the master back is completed.

On the other hand, in FIG. 2, the air conditioner compressor 22 is belt-driven by the engine, and is connected to and disconnected from the drive side by an electromagnetic clutch 23 mounted on the compressor 22. More specifically, as shown in FIG. 5, the solenoid 23a for the electromagnetic clutch is connected to the battery 25 via the air conditioner relay 24 that is normally open. When the air conditioner switch 26 is turned on, the control unit 21 that receives this signal Activate the air conditioner relay 24 (solenoid 24a
Current is applied to the relay contact 24b to close it, and the electromagnetic clutch 23 is connected. 27
Is a condenser fan motor, and 28 is a FICD solenoid.

When the operation of the air conditioner overlaps at idle,
The engine becomes unstable. Therefore, in FIG. 2, a FICD solenoid valve 32 is provided in one passage 31 that bypasses the throttle valve 1, and this solenoid valve 32 is used when the air conditioner switch is turned on.
It is opened by the signal from. By bypassing the throttle valve 1 in the fully closed position and flowing a fixed amount of auxiliary air, the idle speed is increased to a predetermined value (for example, about 800 rpm).

Further, a duty controllable auxiliary air valve 34 is provided in the other passage 33 bypassing the throttle valve 1, and when the air conditioner switch is turned on, the auxiliary air valve 34 also controls the idle speed. For example, when the feedback control of the idle rotation speed is entered, the actual rotation speed is detected, and the duty ratio (ON time ratio of a constant cycle) given to the auxiliary air valve 34 is controlled so that this matches the target rotation speed. However, when this target speed is ON, the air conditioner switch is turned off.
It is set higher than time.

Now, in the case of an engine having a small displacement (for example, a class of 1000 cc), when the proportion of the air conditioner load that acts on the engine output at the fully closed position of the throttle valve is large,
The amount of auxiliary air that bypasses the throttle valve must be increased, and with this increase in the amount of auxiliary air, a sufficient suction negative pressure cannot be applied to the master bag, and the force to depress the brake increases.

In order to deal with this, the control unit 21 stops the operation of the air conditioner during deceleration under high load.

FIG. 6 is a flow chart of air conditioner control, which is executed at a constant cycle.

At step 1, the air conditioner switch 26 is turned off.
If it is N, if it is ON, proceed to steps 2 and 3,
Check whether the vacuum switch 41 is ON and the idle contact of the throttle sensor 42 is ON.

As shown in FIG. 2, the vacuum switch 41 is a switch for switching from OFF to ON when the negative pressure signal introduced from the intake pipe 3 downstream of the throttle valve 1 becomes weaker than a predetermined value. When the load is ON, a high load is detected, and when the idle contact of the throttle sensor 42 is ON, a deceleration is detected.

When the vacuum switch 41 is ON and the idle contact of the throttle sensor 42 is ON, it is judged that the high load deceleration is being performed, and the routine proceeds to step 4, where the operation of the air conditioner relay 24 is stopped (relay solenoid 24a
OFF). When the air conditioner relay 24 stops operating, F
Since the ICD solenoid valve 32 is closed, the suction negative pressure becomes strong and the necessary negative pressure of the master bag 12 is secured.

In steps 2 and 3, the vacuum switch 41
Is OFF, or when the vacuum switch 41 is ON but the idle contact of the throttle sensor 42 is not ON, the routine proceeds to step 5 to activate the air conditioner relay 24.

Here, the operation of this example will be described with reference to FIG. 7, which shows the characteristics of the suction negative pressure with respect to the engine speed and the load.

During deceleration with the air conditioner switch 26 OFF, the suction negative pressure determined by the rotation speed (idle rotation speed) and the load is at the point A, and the shaded area (the suction negative pressure is higher than a certain value is strong). Since it is included in the area where the necessary negative pressure of the masterback is secured), the masterback works and a large braking force is obtained.

When the FICD solenoid valve 32 is opened during deceleration with the air conditioner switch 26 in the ON state, the rotation speed increases from point A by the amount of idle up and the suction negative pressure weakens (upper side in the figure). Move to. In the engine with a small displacement even with the same air conditioner load, this decrease in intake negative pressure is larger than that in a large displacement engine. Therefore, when the intake negative pressure moves to point B outside the shaded area, the masterback does not function sufficiently. .

On the other hand, in this example, the vacuum switch 41 is turned on by the suction negative pressure slightly below the point B (of course, the idle contact of the throttle sensor 42 is on because of deceleration), and the air conditioner relay 24 is deactivated (compressor load is disconnected from the engine). By stopping the operation of the air conditioner relay 24, the current to the FICD solenoid 28 is cut off, and the FIC
Since the D solenoid valve 32 is closed, the suction negative pressure becomes stronger and is returned to the shaded area. The suction negative pressure returns to the value when the air conditioner switch is OFF, and this allows the master bag to fully function again.

Although the embodiment has been described as including the FICD solenoid valve 32, it is not an essential requirement to have this. Even in the case of a simple configuration in which only the auxiliary air valve 34 is provided and the duty ratio given to the auxiliary air valve 34 when the air conditioner switch is turned ON is increased by a constant value ISCa, this constant value can be maintained during high load deceleration. This is because the suction negative pressure required by the master bag can be returned by not adding.

Some air conditioners stop operating when decelerating with the air conditioner switch on (see Japanese Utility Model Laid-Open No. 63-102945). This is to prevent the vehicle from running too much due to an increase in the output of the engine during deceleration such as when descending a slope, and its purpose is different from that of the present application.

[0030]

According to the present invention, a master back for boosting a braking force by utilizing a suction negative pressure stronger than a predetermined pressure, a clutch for connecting and disconnecting an air conditioner compressor and an engine,
Means for determining whether the air conditioner switch is ON, means for connecting the clutch when the air conditioner switch is ON, a valve for adjusting the amount of auxiliary air that bypasses the intake throttle valve, and the intake air Means for determining whether or not the throttle valve is in the fully closed position, and means for increasing the opening degree of the auxiliary air valve when the intake throttle valve is in the fully closed position based on this determination result and the air conditioner switch is ON based on the above determination result And a sensor for detecting that the suction negative pressure has reached a value at the time of high load, a means for judging whether or not it is during deceleration, and a suction negative pressure at the time of deceleration based on this judgment result When the value at the time of high load is reached, the clutch connection by the clutch connecting means is stopped and the air valve opening by the air valve opening increasing means is changed to the air conditioner switch O.
Since the means for returning to the value at the time of FF is provided, the masterback can be made to work at the time of deceleration even in an engine with a small displacement.

[Brief description of drawings]

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

FIG. 2 is a system diagram of an embodiment.

FIG. 3 is a diagram showing piping to a master bag.

FIG. 4 is a vertical sectional view of a master bag.

FIG. 5 is an electric circuit diagram relating to an air conditioner.

FIG. 6 is a flowchart for explaining air conditioner cut control.

FIG. 7 is a characteristic diagram of suction negative pressure for explaining the operation of the embodiment.

[Explanation of symbols]

 1 intake throttle valve 12 master back 21 control unit 22 air conditioner compressor 23 electromagnetic clutch 24 air conditioner relay 26 air conditioner switch 31 bypass passage 32 FICD solenoid valve 33 bypass passage 34 auxiliary air valve 41 vacuum switch (suction negative pressure sensor) 42 throttle sensor 51 master Back 52 Air conditioner compressor 53 Clutch 54 Air conditioner switch 55 Switch ON judgment means 56 Electromagnetic clutch connection means 57 Intake throttle valve 58 Auxiliary air valve 59 Full closed position judgment means 60 Air valve opening increase means 61 Intake negative pressure sensor 62 Deceleration judgment Means 63 Connection stop / opening return means

Claims (1)

[Claims] 1. A master bag for boosting a braking force by using an intake negative pressure stronger than a predetermined pressure, a clutch for connecting and disconnecting an air conditioner compressor and an engine, and means for determining whether an air conditioner switch is ON. From this determination result, it is determined whether the clutch is engaged when the air conditioner switch is turned on, the valve that adjusts the amount of auxiliary air that bypasses the intake throttle valve, and the intake throttle valve is in the fully closed position. Means for increasing the opening degree of the auxiliary air valve when the intake throttle valve is in the fully closed position based on this determination result and the air conditioner switch is on based on the determination result, and the suction negative pressure becomes the value at the time of high load. Sensor to detect that the intake negative pressure is high when the vehicle is decelerating based on the result of this determination and the sensor detection value. And a means for stopping the clutch connection by the clutch connecting means and for returning the air valve opening degree by the air valve opening degree increasing means to the value when the air conditioner switch is OFF. Control device.