JPH052527B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle air conditioner, and particularly to setting the maximum air flow rate in heater mode.

[Conventional technology]

Conventionally, a vehicle air conditioner has, as shown in FIG. 4, an inside/outside air switching door 2 provided in a duct 1, a blower 3, a cooler 4, an air mix door 5,
It includes a heater 6, a mode switching door 7, a defrost outlet 8, a face outlet 9, and a foot outlet 10. The cooler 4 includes a compressor 11,
The condenser 12, receiver tank 13, and expansion valve 14 constitute a cooling cycle. The rotational force of the engine 15 is transmitted to the compressor 11 via a magnetic clutch 16.

17 is an A/D converter, which detects the temperature Tr detected by the inside air sensor 18 that detects the temperature inside the vehicle, the opening degree θ of the air mix door 5 detected by the position detection potentiometer 19, and the amount of solar radiation Ts detected by the solar radiation sensor 20. , the outside air temperature Ta detected by the outside air temperature sensor 21, the duct internal temperature Tm detected by the mode sensor 22, the set temperature TD outputted from the temperature setting device 23, and the water temperature switch 50.
The output signal Tw is converted into each digital signal and outputted to the control section 24.

The control unit 24 is composed of, for example, a microcomputer, and controls the switching circuit 25 and the actuator 2.
6, a compressor control means 29 that controls the magnetic clutch 16 via a drive circuit 28, and a blower 3 via a drive circuit 65. A blower control means 31 to control, a drive circuit 60,
Air mix door 5 via actuator 50
an air mix door control means 34 that controls the mode switching door 7, and a mode switching door control means 3 that controls the mode switching door 7 via the switching circuit 35 and actuator 36.
7 and each data Tr, Ts, Ta, Tm, TD, each control means 27, 29, 31, 34 and 3
7 and an arithmetic means 38 for outputting each output. 39 is a manual switch for controlling the blower.

The compressor control means 29 controls the temperature inside the duct.
When Tm decreased to a temperature level (stored in the setting device 41) slightly higher than the freezing temperature of the cooler 4, the compressor 11 was turned off, and the temperature rose to a level higher than the above level by the hysteresis width (memorized in the setting device 40). The compressor 11 is sometimes turned on to keep the temperature of the cooler 4 constant.

[Problem that the invention seeks to solve]

However, conventional vehicle air conditioners
As disclosed in Japanese Patent Application Laid-Open No. 56-146416, the basic maximum air volume is determined regardless of the engine type and outside temperature, and control is performed from the basic maximum air volume Bh to the basic minimum air volume B1 based on the magnitude of the overall signal T. For,
If this is applied directly to a thermally efficient engine that has become popular in recent years, such as a direct injection diesel engine, the engine's heat generation is small, so even though the heating capacity of the heater unit is not sufficient, when in full heater mode, This has the disadvantage that the maximum amount of air is sent in, which actually lowers the blowing temperature and lowers the room temperature.

[Means for solving problems]

In order to set an appropriate maximum required air volume Ba in the heater mode based on the temperature rise rate of the cooling water, the present invention includes a cooling water temperature rise rate measuring means, a calculation means for determining the required maximum air volume, and a blower. and maximum air volume setting means for setting the air volume to a required maximum air volume.

Thereby, the maximum air volume is set in accordance with the types of engine heat generation that are variously different, so that appropriate heating control can be performed in the heater mode.

[Operation] The calculation means performs a predetermined calculation on the output Tχ of the temperature rise rate measuring means to obtain the required maximum air volume Ba, and the maximum air volume setting means sets this required maximum air volume Ba as the maximum air flow volume of the blower. The maximum air volume of the blower changes depending on the amount of heat generated by the engine.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a vehicle air conditioner according to the present invention.

In the figure, the same parts as in FIG. 4 are denoted by the same reference numerals, and 80 is a temperature increase rate measuring means for measuring the time until the cooling water temperature rises to a predetermined value α after the engine is started in order to know the heat generation capacity of the engine. The measurement starts from the engine start, and the water temperature sensor 5
It consists of a timer that ends measurement when the water temperature Tw detected by 0 reaches the set value α. This timer can detect the time Tχ from the start of the engine until the engine cooling water temperature reaches the set value α, and this output corresponds to the heat generation capacity of the engine. 81 is the output of this temperature rise rate measuring means 80
This is a calculation means that calculates the required maximum air volume Ba from Tx, and the required maximum air volume Ba is calculated from the preset basic maximum air volume Bh by the value Tχ・β obtained by multiplying the output Tχ of the temperature rise rate measuring means by a predetermined constant β.
Find by subtracting. Reference numeral 82 denotes maximum air volume setting means for setting the required maximum air volume Ba determined by the calculation means 81 as the basic maximum air volume of the blower 3. 83 is based on the general signal T and sets the air volume of the blower to the basic maximum air volume.
This is a blower control means that controls from Bh to the basic minimum air volume B1. 84 is a vehicle interior temperature detection means for detecting the vehicle interior temperature Tr, and 85 is an activation control means for setting the air volume of the blower to the air volume Bs corresponding to the value of the output Tr of the vehicle interior temperature detection means 84 immediately after the engine is started.

Next, the operation of this embodiment will be explained using the flowchart shown in FIG. When the ignition switch is turned on in step 100, the timer of the temperature rise rate measuring means 80 is activated in step 101 to perform timer measurement. This is when the ignition switch is turned on for the first time. In step 102,
The signal Tw of the water temperature sensor 50 is input, and the signal Tw (water temperature) of the water temperature sensor 50 is set to the set value α in step 103.
When this is reached, the measurement is completed in step 104. As a result, the time from when the engine is started until the engine water temperature reaches the set value α can be determined, and this measured time (output) Tχ corresponds to the engine heat generation capacity.

Next, in step 105, the calculation means 81
Calculate the required maximum air volume Ba on the heating side of the control pattern. According to the calculation formula Ba=Bh−Tχ·β, the longer it takes for the water temperature to reach the predetermined value α, the lower the heat generation capacity of the engine becomes, and the lower the required maximum air volume Ba becomes. Therefore, the blower is controlled by the control means 83 based on the general signal T as shown in FIG. As shown, the setting value a
It decreases as Tχ increases between b and b. If the blower 3 is in the automatic control mode in step 106, the process proceeds to step 108, where the starting air volume Bs during heating is calculated.

The heating start air volume Bs increases in proportion to the temperature Tr in the process where the vehicle interior temperature Tr increases from a predetermined value Tr ₁ to a predetermined value Tr ₂ as shown in FIG. 3c.

In step 109, when Ba≦Bs, the program proceeds to step 111, and the program PROGI in Fig. 3a and Fig. 3b
It is controlled by the program PROG. That is,
The maximum air volume setting means 82 replaces the required maximum air volume Ba according to PROG with the basic maximum air volume Bh, and based on this required maximum air volume Ba, the blower control means 83 sets the blower 3 based on the control pattern PROG shown in FIG. 3a. It is controlled via a drive circuit 65.
On the other hand, when Ba > Bs in step 109, step 110
Then, the startup control means 85 controls the heating startup air volume based on the program PROG of the control pattern shown in FIG. 3c. As a result, immediately after the engine starts, the speed of the blower is increased in response to the rise in the vehicle interior temperature Tr.

〔effect〕

As explained above, according to the present invention, the maximum air volume in full heater mode is changed and adjusted based on the rate of increase in cooling water temperature, that is, the heat generation capacity of the engine, so even if there are differences in engine type, etc. Appropriate and effective heating can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the vehicle air conditioner according to the present invention, FIGS. 2 and 3 a to 3 c are flow charts and graphs for explaining the operation of the embodiment, and FIG. 4 is a conventional FIG. 2 is a simplified configuration diagram showing an example. 80...Temperature rise rate measuring means, 81...Calculating means, 82...Maximum air volume setting means, 83...Blower control means, 84...Interior temperature detection means, 85...
...Start-up control means.

Claims (1)

[Scope of Claims] 1. In a vehicle air conditioner equipped with an air blower control means for controlling an air blower from a basic maximum air volume Bh to a basic minimum air volume Bl set in advance based on a heat load, after the engine is started, the cooling water temperature is changed. a temperature rise rate measuring means 80 for measuring the time until the temperature rises to a predetermined value; and an output of the temperature rise rate measuring means 80.
Calculation means 81 for calculating the required maximum air volume Ba by Tχ
and maximum air volume setting means 82 for setting the necessary maximum air volume Ba as the basic maximum air volume of the blower. 2. The required maximum air volume Ba is set by subtracting the value obtained by multiplying the output Tχ of the temperature rise rate measuring means by a predetermined constant β from the basic maximum air volume Ba set in the air blowing control means 83. Range 1
The vehicle air conditioner described in Section 1. 3. The startup control means 85 increases the air volume of the blower in response to an increase in the vehicle interior temperature Tr detected by the vehicle interior temperature detection means immediately after the engine is started, and the startup is increased by the startup control means 85. 2. The vehicle air conditioner according to claim 1, wherein the blower is automatically controlled by the blower control means 83 after the airflow Bs reaches the required maximum airflow Ba.