JPH04303015A - Air conditioning control device for vehicle - Google Patents

Abstract

PURPOSE:To enhance operation efficiency and energy efficiency by calculating an evaporator setting temperature on the basis of a measurement data from a humidity sensor and a setting value of a target inside-cabin temperature setting switch, and on-off controlling an evaporator compressor in accordance with relationship between the calculated value and a measurement data from a temperature sensor. CONSTITUTION:A control device 10 calculates an evaporator setting temperature TON at the time of a compressor 42 being turned on as well as an evaporator setting temperature TOFF at the time of the compressor 42 being turned off, based on a control map according to a measurement data from a humidity sensor 30 and a setting value of a target inside-cabin temperature setting switch 22, and on-off controls the compressor 42 of an evaporator 43 according to relationship between those setting temperatures and a measurement data from an evaporator temperature sensor 25. Accordingly, an OFF time of a compressor clutch becomes long when an evaporator induction temperature is low so that an engine load can be lightened for a long time.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioning control system.

0002

BACKGROUND OF THE INVENTION In recent years, long-distance and long-distance driving has become more common, and one of the important factors for safe driving is to immediately or stably maintain the environment inside the vehicle in a comfortable state.

[0003] Turning the compressor on and off
) In air conditioning equipment systems that are controlled by the evaporator temperature, if the evaporator temperature is higher than the evaporator set temperature TON when the compressor is turned on, the compressor is turned on and outside air is introduced while being cooled; If the temperature is lower than the evaporator set temperature TOFF, the compressor is turned off.

0004

However, in the above conventional example, as shown in FIG. 5, the evaporator set temperature TON when turning on the compressor and the evaporator set temperature TO when turning off the compressor are different.
The FF is controlled to a constant value regardless of the target cabin temperature, and after the temperature is lowered by the evaporator, it is heated by the heater as necessary, so the compressor turns on and off more times, which improves the work efficiency of the air conditioner. and had the disadvantage of poor energy efficiency.

[0005]

OBJECTS OF THE INVENTION It is an object of the present invention to provide a vehicle air conditioning control device which improves the disadvantages of the conventional example, and in particular, adjusts the humidity in the vehicle interior appropriately and has excellent operating efficiency and energy efficiency. be.

[0006]

[Means for Solving the Problems] Accordingly, the present invention provides a humidity sensor for measuring the humidity inside a vehicle interior, a vehicle interior target temperature setting means for setting a temperature in the vehicle interior desired by an occupant,
It has an evaporator temperature sensor that detects the temperature of the evaporator in the air conditioning equipment, and a control means that controls on/off the compressor of the evaporator based on each output of the humidity sensor and the vehicle interior target temperature setting means. ,
A map memory is provided that stores a plurality of control maps indicating the optimum relationship between the vehicle interior target temperature and the evaporator set temperature based on the level of humidity in the vehicle interior, and the control means is configured to control the temperature based on the output information from the humidity sensor. An evaporator set temperature calculation function that selects the optimal control map and calculates the evaporator set temperature when controlling the compressor on and off based on this, and the evaporator compressor setting function that calculates the evaporator set temperature based on the evaporator set temperature calculated by this. The system is equipped with a compressor drive control function that controls the drive of the compressor. This aims to achieve the above-mentioned purpose.

[0007]

[Operation] ■Measurement data from various sensors and set values from each switch set by the occupant are input to the control means.

(2) The control means selects a relationship map between the evaporator set temperature and the target vehicle interior temperature based on the measurement data from the humidity sensor.

Evaporator set temperature TON when turning on the evaporator compressor based on the map selected in ■■ and the set value from the target vehicle interior temperature setting switch
The evaporator set temperature TOFF when turning off the compressor is determined.

■Next, the control means controls the evaporator temperature, TON and TOFF from the evaporator temperature sensor.
The relationship between the size and the ON/O of the compressor clutch
The drive of the compressor is controlled by the FF state.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

The embodiment shown in FIG. 1 includes a humidity sensor 30 that measures the humidity inside the vehicle interior, and a target interior temperature setting switch 22 that serves as a vehicle interior target temperature setting means for setting the vehicle interior temperature desired by the occupant. , an evaporator temperature sensor 25 that detects the temperature of the evaporator 43 in the air conditioner, a humidity sensor 30, and a target vehicle interior temperature setting switch 22.
Compressor 4 of evaporator 43 based on each output of
2, and a control means 10 for controlling on/off of the power supply device 2. The control means 10 includes a map memory 12A that stores a plurality of control maps indicating the optimal relationship between the target temperature inside the vehicle and the set temperature of the evaporator based on the level of humidity inside the vehicle.
is attached. The control means includes a humidity sensor 3
An evaporator set temperature calculation function that selects the optimal control map based on the output information from 0 and calculates the evaporator set temperature when controlling the compressor on/off based on this, and the evaporator temperature calculation function calculated by this. It also has a compressor drive control function that drives and controls the evaporator compressor based on the set temperature.

To explain this in more detail, the embodiment shown in FIG. 1 includes an outside temperature sensor 20 for measuring the outside temperature, a vehicle interior temperature sensor 21 for measuring the temperature inside the vehicle interior, and a temperature sensor 21 for setting the temperature inside the vehicle interior. A target vehicle interior temperature setting switch 22, a solar radiation sensor 23 that measures the amount of solar radiation, an engine water temperature sensor 24 that measures the engine water temperature, and an evaporator temperature sensor 25 that measures the temperature of the evaporator 43 in the air conditioning equipment.
, an internal/external air damper opening sensor 26 that measures the opening of the internal/external air damper 40 inside the air conditioning equipment, an air mix opening sensor 27 that measures the opening of the air mix damper 44 inside the air conditioning equipment, and an air mix opening sensor 27 that measures the opening of the air mix damper 44 inside the air conditioning equipment. an outlet damper opening sensor 28 that measures the openings of the defroster damper 45, foot damper 46, and ventilator damper 47, and an inside/outside air switch 29 that switches between inside and outside air taken into the air conditioner.
A humidity sensor 30 that measures the humidity inside the vehicle, and each sensor 2
0, 21, 23, 24, 25, 26, 27, 28, 30
The internal and external air damper 40 in the air conditioner, the blower fan motor 41, the compressor 42 of the evaporator 43, the air mix damper 44, the defroster damper 45, the foot damper 46, and the ventilator damper 47 are controlled based on the measurement data from the air conditioner and the settings from the switches 22 and 29. and a control means 10 for optimally controlling.

Here, the control means 10 controls each sensor 20, 21, 23, 24, 25, 26, 27 which is an analog signal.
, 28, 30 and each switch 22,
an A/D converter 11 that converts set values from the A/D converter 29 into digital signals; and an arithmetic control device 1 that performs various calculations programmed in advance using signals from the A/D converter 11.
2, and an inside/outside air damper drive circuit 1 that drives the inside/outside air damper 40 in the air conditioner based on the calculation result of the calculation control device 12.
3, a blower fan motor drive circuit 14 that drives the blower fan motor 41, a compressor drive circuit 15 that drives the compressor 42 of the evaporator 43, an air mix damper drive circuit 16 that drives the air mix damper 44, and a defroster damper 45. , foot damper 46,
The vent damper drive circuit 17 drives the ventilator damper 47.

Next, the operation of this embodiment will be explained with reference to the block diagram of FIG. 2 and the flowchart of FIG. 4.

■Various sensors 20, 21, 23, 24, 2
Measurement data from 5, 26, 27, 28, and 30 and set values from each switch 22 and 29 set by the driver are input.

(2) The input signal is converted from an analog value to a digital value by the A/D converter 11.

(2) A digital input signal is read into the arithmetic and control unit 12.

(2) The arithmetic and control unit 12 performs computation for correcting the evaporator temperature setting for driving the compressor. (S10 in FIG. 4) Here, the measured data value W [%] from the humidity sensor 30 and two judgment values H1 and H2 are compared (S10 in FIG.
S20, 30), when W≦H1, map A in FIG. 3(a) is selected (S40 in FIG. 4), and when H1<W≦H2, map B in FIG. 3(a) is selected ( S50 in Figure 4)
, W>H2, map C in FIG. 3(a) is selected. (S60 in Figure 4)

Furthermore, here, a correction coefficient for adding a correction value to the basic map of FIG. 3(b) can be obtained as a function of W without using the map of FIG. 3(a).

[0021] Based on the map obtained in ■■ and the set value from the target vehicle interior temperature setting switch 22, the evaporator set temperatures TON, TO for determining whether the compressor is ON or OFF are determined.
Find FF. (S70 in Figure 4)

In FIG. 3(b), when the set value from the target vehicle interior temperature setting switch 22 is high, the ON time of the compressor is shortened to improve the operating efficiency of the air conditioner.

Here, when the evaporator temperature TEVP from the evaporator temperature sensor 25 becomes higher than TON, the TON value turns on the compressor clutch, which is a device that transmits or not transmits the rotational force of the engine to the compressor shaft. This is the setting value for operating the compressor.

The TOFF value is a set value that turns off the compressor clutch and stops the compressor when TEVP becomes lower than TOFF.

Next, the arithmetic and control unit 12 determines whether or not to drive the compressor.

(2) Evaporator temperatures TEVP and TON are compared. (S80 in Figure 4)

(2) If the evaporator temperature TEVP is higher than TON, it is checked whether the compressor clutch is in the ON or OFF state. (S100 in Figure 4)

0028
] If the compressor clutch is in the OFF state, a compressor clutch ON drive command is issued to the compressor drive circuit 15. (S120 in FIG. 4) Then, the rotational force of the engine is transmitted to the compressor shaft, causing the compressor 42 to rotate. The rotation of the compressor 42 moves a low-temperature, low-pressure mist refrigerant to the evaporator 43, and the refrigerant in the evaporator 43 cools the air passing through the evaporator 43, thereby lowering the evaporator temperature TEVP.

Conversely, if the compressor clutch is in the ON state, a compressor clutch continuation drive command is issued to the compressor drive circuit 15. (S140 in Figure 4)

0
(2) If the evaporator temperature TEVP is lower than TON, the evaporator temperature TEVP and TOFF are further compared. (S90 in Figure 4)

If the evaporator temperature TEVP is equal to or higher than TOFF, a compressor clutch continuation drive command is issued to the compressor drive circuit 15. (S140 in Figure 4)

[
If the evaporator temperature TEVP is below TOFF, it is checked whether the compressor clutch is in the ON or OFF state. (S110 in Figure 4)

If the compressor clutch is in the OFF state, a compressor clutch continuation drive command is issued to the compressor drive circuit 15. (S140 in Figure 4)

003
4] Conversely, if the compressor clutch is in the ON state,
Compressor clutch OF in compressor drive circuit 15
F drive command is issued. (S130 in Figure 4)

0035
That is, as TON and TOFF become higher, the OFF time of the compressor clutch becomes longer and the time during which the engine load is lighter becomes longer, so the operating efficiency and energy efficiency of the air conditioner improve.

The arithmetic and control unit 12 is programmed with the arithmetic algorithm function described above.

Furthermore, a wiper switch can be used instead of the humidity sensor 30. However, when the wiper switch is ON, map C in FIG. 3(a) is selected, and when the wiper switch is OFF, map A in FIG. 3(a) is selected. Map B in FIG. 3(a) is not selected.

[0038]

As described above, according to the present invention, the evaporator set temperature TON when turning on the evaporator compressor and the setting value when turning the compressor off are determined based on the measurement data from the humidity sensor and the set value from the target vehicle interior temperature setting switch. The evaporator temperature sensor calculates the evaporator set temperature TOFF at the time of the evaporator temperature sensor, and further includes a control means that controls ON/OFF of the evaporator compressor in the air conditioning equipment based on the relationship between these set temperatures and measurement data from the evaporator temperature sensor. Therefore, when the evaporator inlet temperature is low, the compressor is turned on and off.
The evaporator temperature setting when switching to F becomes higher, the OFF time of the compressor clutch becomes longer, and the engine load can be lightened for a longer period of time. As a result, it is possible to improve the operating efficiency and energy efficiency of air conditioning equipment, and to maintain a comfortable vehicle interior environment even if the target interior temperature changes, and furthermore, the target interior temperature is high. It is possible to provide an unprecedented and excellent vehicle air conditioning control device that does not blow out dry air even when the air conditioner is in use.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram for explaining the operation of FIG. 1;

FIG. 3 is a diagram showing the relationship between the evaporator set temperature and the target vehicle interior temperature.

FIG. 4 is a flowchart for explaining the operation of FIG. 1;

FIG. 5 is a diagram showing the relationship between the evaporator set temperature and the target vehicle interior temperature in a conventional example.

[Explanation of symbols]

10 Control means 12A Map memory 22 Target vehicle interior temperature setting switch 25
Evaporator temperature sensor 30 Humidity sensor 42 Compressor 43 Evaporator

Claims (1)

[Claims] [Claim 1] A humidity sensor that measures the humidity inside a vehicle interior, a vehicle interior target temperature setting means that sets a temperature in the vehicle interior desired by an occupant, and an evaporator temperature sensor that detects the temperature of an evaporator in an air conditioning device. control means for controlling the evaporator compressor on and off based on the respective outputs of the humidity sensor and the vehicle interior target temperature setting means; A map memory storing a plurality of control maps showing the optimum relationship with the evaporator set temperature is provided, and the control means selects the optimum control map based on the output information from the humidity sensor and performs the control based on the selected control map. Equipped with an evaporator set temperature calculation function that calculates the evaporator set temperature when controlling the compressor on and off, and a compressor drive control function that drives and controls the evaporator compressor based on the calculated evaporator set temperature. A vehicle air conditioning control device characterized by: