JPH01306317A - Control device for air conditioning vehicle - Google Patents

Abstract

PURPOSE:To prevent the blowing out of a cold wind carelessly at actuating time at the actuation time of the intermediate period of a spring, automn, etc. by driving a compressor only at the time of both of an outside air temp. and the blowing out temp. of a heater core downstream side are higher than the specified value. CONSTITUTION:When an outside air temp. is decided to be higher than the specified value by the signal from an outside air temp. sensor 32 in a controller 31, the inlet port air temp. of a heater core 10 and an engine cooling water temp. are respectively detected by the signals from an air temp. sensor 47 and water temp. sensor 48. The wind amount of a blower 5 and the opening of an air mixing door 9 are then detected and the operation of the blowing out temp. of the heater core 8 is performed therefrom. When this blowing out temp. is found higher than the specified value, a solenoid clutch 22 is connected and a compressor 21 is turned ON. On the other hand, the compressor is turned OFF with the connection of the clutch 22 being released when the blowing out temp. is found lower. Even in case of the outside air temp. being found lower than the specified value the compressor 21 is turned OFF without operating the blowing out temp. of the heater core 10.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a vehicle air conditioning control device.

(Prior art) Conventionally, a compressor driven by an engine,
There is a known air conditioner for a vehicle that forms a refrigeration cycle together with the compressor and includes an evaporator placed in the air passage of the air conditioner, and a heater core that is also placed in the air passage and circulates engine cooling water. It is being

In such air conditioners, it is desirable to dehumidify the air in order to pursue comfort, but when the outside temperature is low enough, the moisture contained in the air is low and it is necessary to operate the compressor to dehumidify. Since there is no such thing, for example,
As described in Publication No. 14014, the outside air temperature is detected, and the compressor is operated according to the detected value of the outside air temperature.
It is known to perform N10FF control.

(Problem to be Solved by the Invention) However, if the compressor is controlled based only on the outside air temperature in this way, if the outside air temperature is a little low, for example, about 10 degrees Celsius, in intermediate seasons such as spring and autumn, When the compressor is activated, the air is cooled by the evaporator and then warmed by the heater core to reach a predetermined temperature. However, if the temperature of the engine coolant is low, the air cannot be raised sufficiently by the heater core, and at startup. There is a problem in that cold air with a temperature lower than the desired temperature is blown out.

The present invention has been made in view of the above, and an object of the present invention is to provide a vehicle air conditioning control device that can prevent cold air from being blown out during startup during intermediate periods such as spring and autumn.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a compressor driven by an engine, and an evaporator that forms a refrigeration cycle together with the compressor and is disposed in the ventilation path of an air conditioner. , which also includes a heater core disposed in the ventilation passage and through which engine cooling water circulates, an outside air temperature detection means for detecting outside air temperature, and an air outlet temperature calculation means for calculating an air outlet temperature on the downstream side of the heater core. , a control means that receives outputs from the outside air temperature detection means and the outlet temperature calculation means and drives the compressor only when the detected value of the outside air temperature detection means is a predetermined value or more and the detection value of the outlet temperature calculation means is more than a predetermined value. It is characterized by having the following.

Instead of the blowout temperature calculation means, a water temperature detection means for detecting the temperature of the cooling water circulating through the heater core is used, and upon receiving the outputs of the outside air temperature detection means and the water temperature detection means, the detected value of the outside air temperature detection means is equal to or higher than a predetermined value. The above object can also be achieved by providing a control means that drives the compressor only when the detected value of the water temperature means is equal to or higher than a predetermined value.

(Function) According to the invention of claim 1, the compressor is driven only when the outside air temperature and the blowing temperature on the downstream side of the heater core are both equal to or higher than a predetermined value, and unexpected cold air is not blown out.

Further, according to the second aspect of the invention, the compressor is driven only when the outside air temperature and the temperature of the cooling water circulating through the engine are both above a predetermined value, and no unexpected cold air is blown out.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

In Fig. 1 showing the overall configuration of an automobile air conditioner, 1
is a pro-a unit, and is selected by controlling an inside/outside air switching door 4 from an inside air intake hole 2 opened in a floor panel (not shown) and a first outside air intake hole 3 opened at the bottom of the floor panel. It is designed to inhale. The blower unit 1 has a blower 5 arranged in a ventilation passage, and a cooler unit 6 and a heater unit 7 are connected to the downstream side.

The cooler unit 6 has an evaporator 8, and the evaporator 8 forms a refrigeration cycle together with a compressor 21, which will be described later.

The heater unit 7 is configured to circulate engine cooling water 1 and has an air mix door 9 and a heater core 10 arranged in a ventilation passage, and controls the opening degree of the air mix door 9. It is designed to adjust the temperature of the air.

11 is a vent outlet, 12 is a differential outlet, 13 is a heat outlet, and each vent door 14. Differential door 15. The opening degree of the heat door 16 is configured to drive and control the actuator 17, thereby controlling the amount of air blown out.

Reference numeral 20 denotes an engine, which drives a compressor 21. That is, the drive shaft of the compressor 21 is connected to a pulley 23 via an electromagnetic clutch 22, and the pulley 23 is linked via a belt 25 to another pulley 24 fixed to the crankshaft of the engine 20.

31 is a controller which, as shown in FIG. 2, includes an outlet temperature detection means 101 for detecting the Suita temperature on the downstream side of the heater core 10, an outside temperature sensor 32 as an outside air temperature detection means for detecting the outside air temperature, and the above-mentioned It has a control means 102 which receives the output of the outlet temperature detecting means and drives the compressor 21 only when the detected value of the outside air temperature sensor 32 is above a predetermined value and the detected value of the above blowing temperature detecting means 101 is above a predetermined value.

In addition, 41.42 is an air volume setting device and a temperature setting device provided on the instrument panel 43, 44 is a radiator,
45 is a capacitor, 46 is a duct sensor, 47 is an air temperature sensor that detects the temperature of the inlet of the heater core 10,
48 is a water temperature sensor that detects the engine cooling water temperature; 49
50 is a solar radiation sensor, and 50 is an air mix door and a heater core] An actuator that controls the opening degree of a control door 51 that controls the amount of air blown out from 0, and has a potentiometer 50a.

Subsequently, the compressor 2 by the controller 31]
We will explain the flow of control, but first we will explain the basic control of air conditioning. .

As shown in Fig. 3, when the ignition is turned on, the CPU is reset in step Sl).
It is determined whether or not there is runaway (step S2). If there is no runaway, the process moves to check mode (step S3), whereas if it is runaway, the process returns to step S].

Then, if there is an abnormality in the check mode, a failure diagnosis is performed (step S4), and the process returns to step S. However, if there is no abnormality in the check mode, the various sensors and temperature setting device 4
A total signal T is calculated based on the signals from (step S5).

'r' (tr -25) + α (ta -25) + β (t
d-12)-7 (Td-25) tr; Indoor sensor temperature ta: Outside air sensor temperature td: Duct sensor 'tm degrees Td: Temperature set values α, β, γ: Correction coefficient Air mix door based on the above comprehensive signal T 9 is performed in accordance with FIG. 4 (step s6), air volume control is performed in accordance with FIG. Blow mode control is performed (step S9), and then outside air introduction control is performed to switch between inside and outside air in order not only to ventilate but also to reduce the cooling load and prevent windows from fogging (step 510), and the process returns to step S2. In addition, the fourth
In the figure and Fig. 5, the numbers in parentheses indicate an outside temperature of 25°C.
Shows the room temperature equivalent value [°C] when the temperature setting is 25°C and the duct sensor is 12°C.

As shown in FIG. 6, when the control of the compressor 21 in step S8 is started, it is determined based on the signal from the outside temperature sensor 32 whether the outside temperature is higher than a predetermined value. (Step 5ll) When the outside temperature is higher than the predetermined value, the air temperature sensor 47
The inlet air temperature tm of the heater core 10 is detected based on the signal from the sensor 48 (step S'12), the engine cooling water temperature L V is detected based on the signal from the water bath 11 sensor 48 (step S]3), and the step described above is performed. The wind ff1Va of the blower 5 is detected based on the control of S7 (step 514),
The opening degree θ of the air mix door 9 is detected (step 51).
5) Then, the blowing temperature ta of the heater core 8 is calculated (step 816). That is, tar(tm, t
w, Va, θ) After that, it is determined whether the blowout temperature calculated in step S16 is higher than a predetermined value (step 517), and if the blowout temperature is high, there is no risk of inadvertently blowing out cold air. , connect the electromagnetic clutch 22 and turn the compressor 21 to O.
On the other hand, if the blowout temperature is low, there is a possibility that cold air will blow out from the blowout port, so the electromagnetic clutch 22 is disconnected and the compressor 21 is turned off (step 819).

Furthermore, even when the outside temperature is lower than a predetermined value as determined by step S11, there is a risk that cold air will blow out from each outlet, so without calculating the blowout temperature of the heater core 10,
The kelp 1 knob 21 is turned off (step 519).

In the above embodiment, the blowout temperature of the heater core]O is directly calculated, but since the blowout temperature approximately corresponds to the engine cooling water temperature, instead of the blowout temperature,
The engine coolant temperature detected by the water temperature sensor 48 can also be used.

That is, as shown in FIG. 7, when starting, it is determined whether the outside temperature is higher than a predetermined value (step 52).
1) If the blowing temperature is high, then it is determined whether the engine cooling water 1R is higher than a predetermined value based on the signal from the water temperature sensor 48 that detects the engine cooling water temperature (step 522); Since there is no risk of cold air being blown out if the blowing temperature is high, the compressor 21 is turned on (step 82).
3) On the other hand, if the blowing temperature is low, there is a possibility that cold air will blow out, so turn off the compressor 21 (step 5).
24).

Further, even when the outside temperature is lower than a predetermined value in the determination in step S21, there is a risk that cold air will be generated, so the compressor 21 is turned off (step 524).

(Effects of the Invention) As described above, the invention of claim 1 controls the operation of the compressor that constitutes the refrigeration cycle together with the evaporator based on the outside temperature and the blowing temperature of the heater unit. It is possible to prevent cold air from being inadvertently blown out at the time of startup during intermediate periods such as the following.

The invention of claim 2 uses the cooling water temperature detection means instead of the blowout temperature detection means, so it has a simple configuration, and
Substantially the same effect as the invention of claim 1 can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an overall configuration diagram of an automobile air conditioner, FIG. 2 is a block diagram showing the configuration of a controller, FIG. 3 is a flowchart of basic control of the air conditioner, and FIG. 4 and 5 are basic diagrams of air mix door control and air volume control, respectively, and FIGS. 6 and 7 are flowcharts showing the processing flow of the controller. 1...Proa unit, 8...Evaporator, 7.
- Heater unit, 10... Heater core, 21...
Compressor, 31...Controller, 32...Outside temperature sensor, 42...Water temperature sensor, 101...Blowout temperature detection means, 1.02...Control means patent applicant Mazda Motor Corporation, -) , ・1 Representative Patent Attorney Hiroshi Maeda (,," , 1-11
□-1-Representative Attorney Patent Attorney Tomoaki Nunami 1 ゛shi-□□) Chire Rei I100 No. 4 Figure 13 Figure 5 2 Figure 3 Figure 6 Figure 67

Claims (2)

[Claims] (1) A compressor driven by the engine, an evaporator that forms a refrigeration cycle together with the compressor and is placed in the ventilation path of the air conditioner, and a heater core that is also placed in the ventilation path and through which engine cooling water circulates. an outside air temperature detection means for detecting the outside air temperature; an air outlet temperature calculation means for calculating the air outlet temperature downstream of the heater core; and an output temperature calculating means for calculating the air outlet temperature downstream of the heater core; A control device for vehicle air conditioning, comprising a control means for driving the compressor only when a detection value of the detection means is greater than or equal to a predetermined value and a detection value of the outlet temperature calculation means is greater than or equal to a predetermined value. (2) A compressor driven by the engine, an evaporator that forms a refrigeration cycle together with the compressor and is placed in the ventilation path of the air conditioner, and a heater core that is also placed in the ventilation path and through which engine cooling water circulates. an outside air temperature detection means for detecting the outside air temperature; a water temperature detection means for detecting the temperature of the cooling water circulating through the heater core; and an output of the outside air temperature detection means and the water temperature detection means, A control device for vehicle air conditioning, comprising a control means for driving the compressor only when a detection value of the detection means is greater than or equal to a predetermined value and a detection value of the water temperature means is greater than or equal to a predetermined value.