JPH0367721A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To improve the control responsiveness and cooling performance when an air conditioner cut on-signal is outputted in accelerating a vehicle by changing an output time of a compressor off signal at an air conditioner corresponding to the revolution number of an engine. CONSTITUTION:A switch 1 for cutting under acceleration outputs an on-signal to an air conditioner for cutting under acceleration when a vehicle is being accelerated. A control part 2 outputs an off-signal to a compressor 3 of an air compressor for a predetermined time through a second NPN transistor 8 by a CPU 5 based on the on-signal for cutting under acceleration inputted through a first NPN transistor 7 from the switch 1. In this case, a detection signal from an engine revolution number detecting means 4 is inputted through an A/D converter 6 to the CPU 5. When the on-signal for cutting under acceleration is outputted, an output time of the off-signal to the compressor 3 is changed corresponding to the revolution number of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle air conditioning control device, and more particularly to a vehicle air conditioning control device suitable for controlling a compressor when the air conditioner is accelerated during use.

[Conventional technology]

Conventionally, in vehicles such as automobiles equipped with an air conditioner, the compressor for the air conditioner is driven by a V-belt from the crankshaft pulley of the engine. For this reason, when the compressor is driven, when the accelerator is depressed and the throttle valve is suddenly opened to accelerate, torque for operating the compressor is required, which causes a problem of insufficient torque and reduced acceleration performance. In order to solve this problem, recently, an acceleration cut switch for air conditioners such as an accelerator switch that detects the depression of the accelerator has been installed, and the ON signal (or OFF signal) of this acceleration cut switch is used as shown in Fig. 4. , for a certain period of time (X [
Sec. 1) A vehicle air conditioning control device that stops the compressor has been devised.

[Problem to be solved by the invention]

However, in the above conventional example, the air conditioner cut function is automatically activated for a certain period of time when the accelerator pedal is pressed, so even after acceleration is finished, the air conditioner remains stopped and the driving vehicle is There were inconveniences such as going against one's will or causing a decline in the cooling performance of the air conditioner.

[Purpose of the invention]

An object of the present invention is to improve the disadvantages of the conventional example, and in particular, to enable air conditioner control that corresponds to the acceleration state more faithfully to the intention of the driver.
The object of the present invention is to provide a vehicle air conditioning control device that can improve cooling performance.

[Means to solve the problem]

The present invention includes an acceleration state detection means that outputs an ON signal for cutting off during acceleration for the air conditioner when the vehicle is accelerating, and outputs an OFF signal when the vehicle is not accelerating, and an ON signal for cutting during acceleration output from the acceleration state detection means. and a control unit that outputs a compressor off signal for a predetermined period of time to turn off the compressor of the air conditioner. This control section is also provided with a rotation speed detection means for detecting the rotation speed of the engine and outputting a rotation speed signal. Furthermore, when the control section receives an ON signal for cutting during acceleration, it is equipped with a signal output time control function that receives a rotational speed signal and changes the output time of a compressor off signal according to the height of the engine rotational speed. The structure is that there are.

This aims to achieve the above-mentioned objective.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The embodiment shown in FIG. 1 includes an acceleration cut switch 1 as an acceleration state detection means that outputs an ON signal for cutting off the air conditioner during acceleration when the vehicle is accelerating, and outputs an OFF signal when the vehicle is not accelerating. The controller 2 includes a control section 2 that receives an acceleration cut-on signal output from the cut switch 1 and outputs a compressor-off signal for turning off the air conditioner compressor 3 for a predetermined period of time.

The control section 2 is also provided with a rotation speed detection means 4 that detects the rotation speed of the engine and outputs a rotation speed signal.

Of these, the control unit 2 includes a CPU 5 composed of a microcomputer, etc.
, an A/D converter 6 interposed between the CPU 5 and the rotation speed detection means 4, a first NPN transistor 7 interposed between the CPU 5 and the acceleration cant switch 1, and the CPU 5. and a second NPN (Npn) plunger interposed between the compressor 3 and the compressor 3.

To explain this in more detail, the A/D converter 6 is connected to the rotation speed detection means 4 (actually, a crank angle sensor or the like is used).
The rotational speed signal, which is a detection signal from the engine, is digitally converted and sent to the CPU 5. The CPU 5 determines the engine speed based on this digitally converted signal. The CPU 5 is connected to the collector side of the first NPN transistor 7, and one end of the acceleration cut switch 1 is connected to the emitter side. As this acceleration cut switch 1,
In reality, a so-called accelerator switch is used. In other words, this acceleration cut switch l is a normally closed switch in which the contact is closed when the accelerator is not depressed and the contact is open when the accelerator is depressed, and the other end is grounded. is used. For this reason, current is supplied to the base of the first NPN transistor from a power supply (not shown), and when the accelerator is not depressed, the transistor becomes conductive and the CPU
The potential at point A of No. 5 becomes a "low (L)" level. This case is the off signal output state of the acceleration cut switch 1.

On the other hand, when the accelerator is depressed, the circuit including the acceleration cut switch 1 is in an open state, so the potential at point A becomes a "high (H)j level."

This case is the ON signal output state of the acceleration cut switch 1.

In this embodiment, when the CPU 5 detects that the potential at point A is r) (J level) and sends a compressor off signal to the base of the second NPN transistor, the second NPN
The PN transistor becomes conductive, the coil of the magnetic switch of the compressor 3 is energized, the contact is opened, and the compressor 3 is stopped.

Next, the compressor control operation during acceleration in the above embodiment will be explained based on FIGS. 2 and 3.

First, when the accelerator is depressed and point A in FIG. 1 becomes H level, the CPU 5 detects this and determines that the vehicle is in an acceleration state (step 5IOI).

Next, the CPU 5 detects the engine rotation speed.
02), the output time of the compressor off signal is calculated according to this rotation speed (S103).

In this case, as shown in FIG. 3, the output time of the compressor off signal becomes shorter as the rotation speed becomes higher.
It is programmed in advance so that x>y>z.

Then, in the CPU 5, only this calculated output time is
A compressor off signal is output to the base of the second NPN transistor 8, and the air conditioner is cut off when accelerating (
S104).

According to this embodiment described above, when the engine is running at low speed, not much horsepower is produced, but when the accelerator pedal is depressed in such a case, a compressor off signal is output from the CPU 5 to the compressor 3 for a relatively long period of time, so that the engine can be quickly turned off. can be accelerated. On the other hand, when the engine is running at high speed, sufficient horsepower is being produced, but when the accelerator pedal is pressed in such a case, a compressor off signal is output from the CPU 5 to the compressor 3 for a relatively short period of time. can be restored. In this way, in order to optimize the cut time during acceleration of the air conditioner according to the engine speed, specifically,
The CPU 5 controls the compressor on and off so that the higher the engine speed, the shorter the cut time during acceleration, effectively preventing the conventional problems of deterioration in acceleration performance and delay in the return of the compressor 3 after acceleration. This has the advantage that the cooling performance of the air conditioner can be improved.

〔Effect of the invention〕

Since the present invention is configured and functions as described above, according to the present invention, the signal output time control function of the control unit makes the cut time of the air conditioner during acceleration shorter when the engine speed is high and becomes longer when the engine speed is low. As a result, it is possible to effectively prevent a decrease in acceleration performance and a delay in the return of the compressor after acceleration is completed, thereby further improving the cooling performance of the air conditioner. can be provided.

FIG. 4 is an explanatory diagram showing the relationship between the engine rotation speed and the cant time during acceleration of the air conditioner in an example. FIG. 4 is an explanatory diagram showing the relationship between the engine rotation speed and the cut time during acceleration of the air conditioner in a conventional example.

1...Acceleration switch as acceleration state detection means, 2...Control unit, 3...Compressor, 4...Rotational speed detection means.

Claims (1)

[Claims] (1) Acceleration state detection means that outputs an ON signal for an acceleration cut for an air conditioner when the vehicle is accelerating and outputs an OFF signal when the vehicle is not accelerating, and an ON signal for an acceleration cut that is output from the acceleration state detection means. and a control section that outputs a compressor off signal for a predetermined period of time to turn off the compressor of the air conditioner, the vehicle air conditioning control device detects the rotation speed of the engine and outputs a rotation speed signal to the control section. A rotational speed detection means is also provided, and when the control section receives the acceleration cut-on signal, the controller receives the rotational speed signal and changes the output time of the compressor off signal according to the level of the engine rotational speed. An air conditioning control device for a vehicle characterized by being equipped with a signal output time control function.