JPS58211909A - Cooler-mode control method of air conditioning device for vehicle - Google Patents

Abstract

PURPOSE:To reduce the load on engine and smooth acceleration, by setting an air intake mode and increasing the working rate of a compressor under deceleration, constant speed and high speed running conditions. CONSTITUTION:If a vehicular speed is lower than a fixed speed, idling or low speed running is decided, and if it is higher than the fixed speed and an accelerator pedal is depressed, accelerated running is decided. According to such a decision, a compressor is switched off or the working rate of the compressor is decreased. If the vehicular speed is higher than the fixed speed and a braking operation is applied with the accelerator pedal undepressed, decelerated running is decided. According to this decision, the compressor is switched on or the working rate thereof is increased and an outside air intake mode is set. If the braking operation is not applied, high speed or constant speed running is decided, and in accordance therewith the compressor is switched on or the working rate is increased during a fixed period of time and the outside air intake mode is set. With this constitution, ventilation is carried out under a low engine load and thereby to reduce the load on engine and smooth acceleration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for a vehicle air conditioner in a cooler mode, and particularly to control of an inside/outside air switching door.

Generally speaking, in a vehicle air conditioner using a sitting crankshaft system that intermittently turns on the combreno, as shown in Figure 1, the compressor is turned on and the temperature of the evaporator reaches the off level I! When the temperature drops to 1, the compressor is turned off, and when the evaporator temperature rises to on level 4, the compressor is turned on, thereby driving the compressor intermittently. On the other hand, the compressor control level consisting of the off level l and the on level l is the set temperature Tv of the temperature setting device and the temperature 1 in the vehicle interior.
When the magnitude of the difference (TD tr) with respect to r becomes small, it is controlled to gradually become lower. Therefore, if the set temperature TD of the temperature setting device becomes low, or if the temperature 1r inside the vehicle becomes high compared to the set temperature, the compressor control bell will be exhausted, and the operating rate of the compressor will increase. , the on/off cycle becomes faster.

In conventional vehicle air conditioners, in the cooler mode in which the compressor is operated, the inside/outside air switching door is set to the inside air introduction mode, and the inside air is controlled to be circulated through the duct of the vehicle air conditioner. I try to keep the inside of the car cool.

However, if the inside/outside air switching door is set in the inside air introduction mode and kept in this mode for a long time, the air inside the vehicle will gradually become contaminated, which is not good for health. Therefore, a method of setting the outside air introduction mode for a specified time after inside air is introduced is considered, but if this is done, for example, while the vehicle is accelerating, the inside air temperature tr will rise when outside air is introduced, so the compressor operation rate will increase. This has the drawback of increasing the load on the engine and making it difficult to accelerate the vehicle smoothly.

An object of the present invention is to increase the amount of air inside the vehicle by using the outside air introduction mode when the vehicle is running at a reduced speed, at a constant speed, or at a high speed, and to reduce the operating rate of the compressor. At this time, the load on the engine is reduced by increasing the
A method for eliminating the above-mentioned drawbacks will be described in detail below using examples.

FIG. 2 is a flowchart showing an embodiment of the control method in the cooler mode of the vehicle air conditioner according to the present invention. Alternatively, it determines whether the vehicle is traveling at a constant speed. This determination is made, for example, by detecting vehicle speed, accelerator pedal depression, and brake operation. In other words, if the vehicle speed exceeds a certain speed, it is considered to be idle or running at low speed, and at this time the compressor is turned off or the operating rate of the compressor is reduced, and the inside/outside air switching door is set to inside air introduction mode. . In addition, even if the vehicle speed is above a certain speed, if the accelerator pedal is pressed down, the vehicle is accelerating, so the compressor should be turned on or the operating rate should be reduced, and the inside/outside air switching door should be turned on. It is set to shy air introduction mode. This prevents warm air from entering the vehicle interior, reducing the load on the compressor and engine, and reducing the operating rate, resulting in power savings. Next, if the vehicle speed is above a certain speed and the accelerator pedal is not depressed, it is determined whether the brakes are in operation.

That is, when the brake pedal is depressed or the engine brake is applied, the vehicle is decelerating, so at this time the compressor is turned on or its operating rate is increased, and the inside/outside air switching door is set to the outside air introduction mode. This allows the air inside the vehicle to be ventilated and purified, and the compressor is operated only when the vehicle is decelerating, when the engine is under heavy load, so it can save energy. . In addition, when the brakes are not operating, the vehicle is likely to be running at high speed or at a constant speed, so in this case, turn on the compressor or increase its operating rate and activate the timer to check the internal and external The air switching door is alternately switched between the inside air introduction mode and the outside air introduction mode.

This reduces ventilation noise in the vehicle interior to some extent, and even when driving at high speeds or constant speeds, even if the compressor is turned on, increasing its operating rate will not put much strain on the engine. It can be motorized. That is, by increasing the operating rate during deceleration driving, high speed driving, or constant speed driving, it becomes possible to store cold air in the vehicle interior. Further, according to the present invention, the operating rate of the compressor is reduced when the vehicle is idling, running at low speed, and accelerating, so the engine speed does not fluctuate and the vehicle can be operated smoothly.

As explained above, according to the present invention, when the vehicle air conditioner is in the cooler mode, the proportion of outside air introduced is increased to perform ventilation when the vehicle is running at a reduced speed, at a high speed, or at a constant speed. Therefore, it is possible to purify the air inside the vehicle, save power, and make it easier to operate the accelerator.

In this embodiment, it has been explained that the idling, low-speed running, acceleration running, deceleration running, etc. of the vehicle are determined based on the vehicle speed, the amount of accelerator depression, and the operation of the brake, but the present invention is not limited to this, and the engine It may be 1 or more so that the determination is made based on factors such as the number of rotations.

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram for explaining the operation of a cycling clutch type vehicle air conditioner, and FIG. 2 is a flowchart showing an embodiment of the control method in the cooler mode of the vehicle air conditioner according to the present invention. . nf-f-Applicant: Agent of Diesel Kiki Co., Ltd.
Patent attorney Jun Miyazono −

Claims (2)

[Claims] (1) Detects whether the vehicle is running at a slow speed or at a high speed, and when the vehicle is running at a constant speed, the compressor is turned on or the operating rate is increased, and the ratio of outside air introduced by the inside/outside air switching door is changed to the above-mentioned deceleration speed or high speed speed. A control method in a cooler mode of an air conditioner for a vehicle, characterized in that the temperature is increased in times other than running states such as running and constant speed running. (2) When the vehicle is decelerating, the inside/outside air switching door is kept in the outside air introduction mode, and when the vehicle is driving at high speed or at a constant speed, the inside/outside air switching door is alternately switched between the inside air introduction mode and the outside air introduction mode. A method for controlling a vehicle air conditioner in a cooler mode according to claim 1.