JPH0439116A - Air conditioning control device for vehicle - Google Patents

Abstract

PURPOSE:To alleviate a drop in cooling effect and prevent the deterioration in air conditioning feeling generated at the time of engine acceleration by performing the fluctuating supply of the air when a means for judging the engine acceleration judges that the engine is being accelerated. CONSTITUTION:A control unit 30 makes judgement as to whether acceleration equal to or above the predetermined level is under way and diffusion is in VENT mode. When the acceleration is taking place and the diffusion is in VENT mode, the control unit 30 performs the fluctuating supply of the air. In other cases, the air is supplied in a normal way. During the fluctuating air supply, a blower 18 rotates with pulsation under fluctuating voltage, and sends an air flow changing in quantity like natural wind. During engine acceleration, a compressor is made to stop and a cooling effect deteriorates. The fluctuating air supply. However, is made during the rest of the compressor, and unpleasant feeling can be somewhat alleviated due to the effect of the fluctuating air supply, even though cooling capability drops.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle air conditioning control device that limits the operation of a compressor during engine acceleration.

[Prior Art] Conventionally, in order to reduce the load on the engine when a vehicle accelerates, control technologies have been proposed that stop the compressor or reduce the capacity of the compressor.
(Refer to Publication No.-10894).

[Problem to be solved by the invention] However, if the operation of the compressor is restricted during cooling,
There is a problem that the temperature inside the car increases and the feeling of air conditioning deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioning control device that can somewhat improve the above-mentioned deterioration of air conditioning feeling that occurs during acceleration.

[Means for Solving the Problems] The vehicle air conditioner of the present invention has been made in order to achieve the second object, in which the operation of the compressor is limited when the engine accelerates, and the air conditioner determines the acceleration of the engine. The present invention is characterized in that it has a means for blowing air in a fluctuating manner when it is determined that the means is accelerating the engine.

[Function] In the device of the present invention, although the operation of the compressor is restricted during acceleration and the cooling capacity is reduced, fluctuating ventilation is performed during this period. Therefore, the decrease in the cooling effect is somewhat alleviated due to the feeling of cold air caused by the fluctuating air flow.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram shown to explain the main functions of the air conditioning control device of the embodiment, and FIG. 2 is a diagram showing the overall configuration of the air conditioning device including the control device of the embodiment.

First, the overall configuration of the air conditioner will be outlined based on FIG. 2. In FIG. 2, reference numeral 10 is a ventilation duct, and the upstream end of this ventilation duct 10 is provided with an inside air intake 12 and an outside air intake 13, which are switched by an intake door 11, and the downstream end is provided with an inside air intake 12 and an outside air intake 13, which are switched by an intake door 11. A VENT outlet 15, a DEF outlet 16, and a FOOT outlet 17 are provided, which are switched by the outlet door 14.

Also, in the middle of this ventilation duct 10, from the upstream side to the downstream side, a blower 18, an XS porator 19,
An air mix door 20 and a heater 21 are provided.

By controlling the opening degree of the air mix door 20, the mixing ratio of cold air and warm air is adjusted to adjust the temperature of the air blown into the vehicle. In addition, 22 is an actuator for an intake door, 23 is a compressor which forms a cooling system with an evaporator, 24 is an actuator for an air mix door, 25 is a water valve for a heater, and 26 is an actuator for a mode door.

The actuators mentioned above are controlled by a control unit 30. The control unit 30 is mainly configured with a microcomputer, and calculates a target blowout temperature based on input information from at least an inside temperature sensor 31, an outside temperature sensor 32, and a temperature setting device 33. Then, the target position of the air mix door 20 and the target air flow rate of the blower 18 are calculated based on the calculated target blowing temperature, and the air mix door 2
0 and blower 18. In addition, the intake door 11, evaporator 19, and heater 21 are also controlled in the same manner.

Further, this control unit 30 also includes an acceleration sensor 3
If it is determined based on the signal No. 4 that the acceleration is greater than a predetermined value, the compressor stops operating and the air flow during that period is fluctuated. However, the fluctuating air flow is performed only when the vent blow mode is set.

Hereinafter, the main functions of the air conditioner of the embodiment will be explained with reference to FIG. 1, focusing on air blow control. The control unit 30 includes a means 52 for virtually calculating a target blowing temperature based on a signal from the heat load detecting means 51 and a means 53 for calculating a target air flow rate in relation to the target blowing temperature. , means 54 for generating a fluctuation signal, means 55 for calculating a fluctuation air flow rate (momentary air flow rate) based on the target air flow rate and the fluctuation signal, and means 56 for determining whether the blowing mode is vent mode. means 58 for determining whether the acceleration rate detected by the acceleration detection means 57 (acceleration sensor 34) is greater than or equal to a predetermined value; compressor control means 59 for restricting the operation of the compressor when the acceleration is determined to be greater than or equal to the predetermined value; It is determined that the value is above a certain value and the blowout mode is strange! - When it is determined that fluctuation air blowing is to be performed, the fluctuation air blowing execution determining means 60 determines whether to perform fluctuation air blowing, and when the determination result of the fluctuation air blowing execution determining means 60 is "fluctuating air blowing is not performed", the output signal of the target air blowing amount calculation means 53 ( a selection means 62 which selects the normal air blowing signal), selects the output signal (fluctuation air blowing signal) of the fluctuation air blowing calculation means 55 when "fluctuation air blowing execution" is performed, and supplies the selected output signal to the blower control means 61; , with.

The blower control means 61 controls the rotation of the blower 18 (see FIG. 2) in response to a manually inputted air blowing signal.

In other words, if the normal air blow signal is manually input, the blower
18 rotates at a constant rate under a constant voltage and sends out a constant amount of airflow. Also, if a fluctuating air blow signal is input,
The blower 18 performs pulsating rotation under fluctuating voltage;
Sends out airflow with variable air volume similar to natural wind. Note that the fluctuating airflow amount calculation means 55 is the target airflow amount calculation means 5.
The fluctuation signal from the fluctuation signal generating means 54 is added to the target airflow amount signal from No. 3, and the actual airflow amount from moment to moment is output.

Next, the flow of air blow control performed by the control unit 30 of FIG. 2 will be explained using FIG. 3.

In this air blowing control, it is first determined whether acceleration is being performed above a predetermined value and whether the mode is blowing mode or VENT mode (steps 101 and 102). If the vehicle is accelerating and in the VENT mode, the process proceeds to step 103 and fluctuating ventilation is performed. Otherwise, the process advances to step 104 and normal ventilation is performed. Figure 4 shows the acceleration switch during acceleration (
2 is a time chart showing the relationship between the state of SW), the operating state of the compressor, and the blower voltage. As shown in this figure, during acceleration, although the compressor is stopped and the cooling effect deteriorates, fluctuating air is still being blown. Therefore, the user does not have to be so conscious of the decrease in the cooling effect.

In the above embodiment, the compressor operation is stopped during acceleration, but if a variable capacity compressor is used, control may be performed to reduce the capacity during acceleration.

[Effects of the Invention] As explained above, according to the present invention, since the air volume is fluctuated during acceleration, even if the cooling capacity is reduced due to the restriction of compressor operation, the fluctuation effect will cause some inconvenience. It can reduce pleasure.

[Brief explanation of the drawing]

Fig. 1 is a functional diagram showing the configuration of the main parts of an embodiment of the present invention, Fig. 2 is a diagram showing the overall structure of an air conditioner including the control device of the embodiment, and Fig. 3 shows the details of air blow control. The flowchart, FIG. 4, is a time chart showing the relationship between the operating state of the compressor and the content of air flow during acceleration. 18...Blower 30...Control unit, 34...Acceleration sensor, 53...
...Target air flow rate calculation means, 54... Fluctuation signal generation means, 55... Fluctuation air flow rate calculation means, 5
7... Acceleration detection means, 58... Acceleration determination means, 59... Compressor control means, 60...
. . . Selection means, 61 . . . Blower control means.

Claims (1)

[Scope of Claims] A vehicle air conditioner that limits the operation of a compressor when the engine accelerates, comprising: means for determining engine acceleration; and means for performing fluctuating air blowing when the means determines that the engine is accelerating. A vehicle air conditioning control device comprising: