JPS644926B2 - - Google Patents

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, the cycling clutch type vehicle air conditioner that drives the compressor intermittently is the first
As shown in the figure, the compressor is turned on and the compressor is turned off when the evaporator temperature drops to the off level _l1 , and then when the evaporator temperature rises to the on level _l2 , the compressor is turned on. The compressor is driven intermittently. On the other hand, the above off level
The control level of the compressor, which consists of l ₁ and on level l ₂ , gradually decreases as the difference (T _D − _{t r} ) between the set temperature T _D of the temperature setting device and the temperature t _r in the passenger compartment becomes smaller. controlled by. Therefore, when the set temperature T _D of the temperature setting device becomes low or when the temperature t _r inside the vehicle becomes high compared to the set temperature, the control level of the compressor becomes lower, so the operating rate of the compressor increases and its The on/off cycle becomes faster.

In conventional vehicle air conditioners, when the compressor is operated in the cooler mode, 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 room air-conditioned.

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 certain period of time after inside air is introduced is considered, but if this is done while the vehicle is accelerating, for example, the inside air temperature _tr will rise when outside air is introduced, so the operating rate of the compressor will decrease. This increases the size of the engine, which increases the load on the engine and makes it impossible to smoothly accelerate the vehicle.

An object of the present invention is to ventilate the interior of the vehicle as much as possible in the outside air introduction mode when the vehicle is running at a decelerating speed, at a constant speed, or at a high speed, and to increase the operating rate of the compressor at this time, thereby increasing the engine speed. This is intended to reduce the burden and eliminate the above-mentioned drawbacks, and will be explained 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. 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. That is, if the vehicle speed is not above a certain speed, it is assumed that the vehicle is idling 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 the inside air introduction mode. In addition, even if the vehicle speed is above a certain speed, the vehicle is accelerating while the accelerator pedal is being depressed, so the compressor is turned off or the operating rate is reduced at this time as well, and the inside/outside air switching door is turned on to introduce inside air. It is a mode. This prevents warm air from entering the vehicle interior, thereby reducing the burden 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 engine braking 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 in the vehicle interior to be ventilated and purified, and the compressor is operated at a time when there is no load on the engine when the vehicle is decelerating, so it is possible to save energy. In addition, when the brakes are not operating, the vehicle is considered 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 operate the timer to switch between the inside and outside air. The door is alternately switched between the inside air introduction mode and the outside air introduction mode. This makes it possible to ventilate the interior of the vehicle to some extent, and even when driving at high speeds or constant speeds, turning on the compressor or increasing its operating rate does not put much strain on the engine, resulting in power savings. be able to. That is, deceleration driving,
By increasing the operating rate during 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, and also to save power.
It becomes easier to operate the accelerator.

In this embodiment, it has been explained that whether the vehicle is idling, running at low speed, accelerating, decelerating, etc. is 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. The determination may be made based on other factors such as engine speed.

[Brief explanation of drawings]

Figure 1 is a characteristic diagram for explaining the operation of a cycling clutch type vehicle air conditioner;
The figure is a flowchart showing an embodiment of a method for controlling a vehicle air conditioner in cooler mode according to the present invention.

Claims (1)

[Claims] 1 Detects whether the vehicle is decelerating, high speed, or constant speed, turns on the compressor or increases the operating rate in these driving conditions, and maintains the inside/outside air switching door in the outside air introduction mode when the vehicle is decelerating. However, when the vehicle is running at a 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, and when the vehicle is in a state other than the above-mentioned deceleration, high speed, or constant speed driving, A method of controlling a vehicle air conditioner in a cooler mode, the method comprising reducing the operating rate of the compressor and maintaining an inside/outside air switching door in an inside air introduction mode.