JPS63162323A - Compressor controller for cooler for vehicle - Google Patents

Abstract

PURPOSE:To improve the acceleration performance by dividing the engine region into the higher and lower regions and stopping the operation of a compressor on the transition of the engine load from the lower load to the higher load. CONSTITUTION:The signals detected by an intake pipe pressure sensor 2 are input into an intake pipe pressure calculation part 3 of a compressor controller 1. The calculation signal supplied from a calculation part 3 is input into an intake pressure region judging part 4, and the higher or lower load region for the preveiously set engine load is judged. Even if it is judged that the intake pipe pressure is outside the high load region, if a no-release signal for the compressor stop is into a compressor stop judging part 6 from a releasing timer 5, a relay 8 is kept in OFF-state. When a releasing signal is input into the judging part 6 from the releasing timer 5, the relay 8 is set into the turned-ON state, and the compressor is started.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a compressor control device for a vehicle cooling system using a vehicle engine as a driving source.

[Conventional technology]

A conventional compressor control device of this type, for example, as disclosed in Japanese Patent Application Laid-open No. 102029/1983, detects the amount of depression of the accelerator pedal of a vehicle, and when this amount of depression reaches a predetermined value or more. A control device for releasing the load on the compressor, or Japanese Patent Application Laid-Open No. 52-99530
As disclosed in the above publication, a control device is known that detects the intake pipe pressure of an engine and releases the load on a compressor when this pressure reaches a predetermined value or higher.

[Problems to be solved by the invention]

In the conventional compressor control device of a vehicle cooling system as described above, the conditions for determining the engine load state are uniformly set at a high load state above a predetermined load. If the pipe pressure continues to exceed a predetermined value, the compressor remains in a stopped state during that time, causing a problem in that the cooling capacity is significantly reduced. This invention was made to solve this problem, and it improves acceleration performance by stopping the compressor when the engine load changes from low to high load, and also stops the compressor when the high load continues. An object of the present invention is to provide a compressor control device for a vehicle cooling system that can be operated to improve cooling capacity.

[Means to solve the problem]

A compressor control device for a vehicle cooling system according to the present invention is a control device that is equipped with a cooling compressor driven by a vehicle engine and that stops the cooling compressor by detecting a high load state of the engine.
The load range of the engine is divided in advance into two discontinuous ranges, and the compressor is configured to stop when the engine load shifts from a low load to a high load.

【Example】

FIG. 1 is a block diagram showing the configuration of compressor control in a vehicle cooling system according to an embodiment of the present invention.
1 is a compressor control device, 2 is a suction pipe pressure sensor that detects the pressure inside the suction pipe, 3 is a suction pipe pressure calculation unit that calculates the pressure detected by this suction pipe pressure sensor 2, and 4 is this suction pipe pressure calculation unit 3 is a suction pipe pressure region determination unit that determines which region of suction pipe pressure regions predetermined as high and low regions the suction pipe pressure P obtained in step 3 is, 5 is a release timer, 6 is the suction pipe pressure region determination section 4
The compressor is started based on the signals in the high and low ranges of the signal and the signal from the release timer 5. a compressor stop determination unit 9 that determines stoppage, outputs an on/off signal, and operates relay 8 via output circuit 7;
Reference numeral 10 indicates an excitation coil of an electromagnetic clutch that starts and stops the compressor in combination with the driving force of the engine, 10 indicates an air conditioner switch operated by the driver, and 11 indicates a battery. In the compressor control device for a vehicle cooling system configured as described above, the pressure value in the engine suction pipe detected by the suction pipe pressure sensor 2 is input to the suction pipe pressure calculation unit 3 of the compressor control device 1, and the suction pipe pressure is calculated. P is calculated, and it is determined whether this suction pipe pressure P is in a predetermined high or low engine load region where the distance between Pl and Pa is discontinuous as shown in Fig. 2. . Here, for example, even if it is determined that the suction pipe pressure P is outside the high load region of P>Po, if a signal indicating that the compressor stop is not canceled is input from the release timer 5 to the compressor stop determination section 6. , the relay 8 remains in the OFF state, and when a release signal from the release timer 5 is input to the compressor stop determination section 6 after a predetermined period of time has elapsed from this state, the relay 8 shifts to the ON state and starts to start the compressor. . FIG. 3 is a diagram showing the correlation between the above-mentioned suction pipe pressure P and the set time of the timer 5 for starting, stopping and canceling the compressor. When the pedal is depressed and P≧Pa at time t1, the compressor is stopped, and after a predetermined time T has elapsed, the compressor is stopped at time t2.
When this occurs, the compressor is returned to operating condition. During the above operation, the suction pipe pressure decreases to -HP1 <P<PO, and P≧Pa again at time t3, but the compressor does not stop because this is not a change from the low load region of P≦P1. Next, at time t4, P≦P1, and then at time t, P≧Pa, so the compressor stops, returns to the initial operation, and returns to the operating state after a predetermined time T has elapsed. FIG. 4 is a flowchart without showing the steps of the above operation. First, in step 5101, the suction pipe pressure P is calculated, and in step 5102, P and Pa are compared, and P
If ≧Po, the process moves to step 5103, where the presence or absence of the low load area flag is checked. If the flag is set, the process moves to step 5104, where the flag is cleared, and the compressor off time timer is calculated in step 5105. Then, the process moves to step 3106. Also, step 5102 or step 510 above
If NO in step 3, the process moves to step 8106, and if P≦P1, the process moves to step 5107, where a flag is set, and the process moves to step 8108. Also, if No in step 8106 above, step $
108, the compressor off time timer is set to II.
Check whether it is OII, and if NO, stop the compressor in step 5109, further subtract the compressor off time timer in step 5110 to keep the compressor stopped, and if YES in step 8108 above. If so, start the compressor. In the above embodiment, an example was explained in which the engine load is the suction pipe pressure, but the engine load may be the value of the throttle opening, or a parameter that changes in proportion to the suction pipe pressure or the throttle opening may be used. Even if it is used, the same effect as in the above embodiment can be obtained.

【Effect of the invention】

As explained above, the present invention is characterized in that the engine load range is divided in advance into two discontinuous ranges, and the compressor is stopped when the engine load shifts from a low load to a high load. Since the release is performed after a predetermined period of time has elapsed from the stop, it is possible to secure cooling capacity even when high load conditions continue, and improve acceleration performance when accelerating from low load conditions to high load conditions. can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of compressor control for a vehicle cooling system according to an embodiment of the present invention, FIGS. 2 and 3 are diagrams for explaining control operations in the present invention, and FIG. It is a flowchart figure of the control operation in this invention. DESCRIPTION OF SYMBOLS 1... Compressor control device, 2... Suction pipe pressure sensor, 3... Suction pipe pressure calculation part, 4... Suction pipe pressure area determination part, 5... Release timer, 6... Compressor stop determination section. Patent Applicant Fuji Heavy Industries Co., Ltd. Agent Patent Attorney Jundo Nobu Kobashi Patent Attorney Susumu Murai -〇-

Claims (4)

[Claims] (1) In a compressor control device for a vehicle cooling system, which uses the vehicle engine as a driving source, and stops the compressor of the cooling system during acceleration based on the operating conditions of the engine, and releases the load on the compressor. A compressor control device for a vehicle cooling system, characterized in that the load range of the engine is divided into high and low, and the compressor is stopped when the engine load shifts from a low load to a high load. (2) The compressor control device for a vehicle cooling system according to claim 1, wherein the engine load range is divided into two discontinuous ranges. (3) A compressor for a vehicle cooling system according to claim 1, wherein the engine load is set to suction pipe pressure, throttle opening, or a parameter that changes in proportion to these. Control device. (4) A compressor control device for a vehicle cooling system as set forth in claim 1, wherein the compressor stop is released when a predetermined time has elapsed since the compressor stopped.