JPH05185825A - Car air conditioner - Google Patents

Abstract

PURPOSE:To prevent an air flow of blowoff air temperature largely separated out of the intrinsic blowoff temperature from being blown out of a supply opening after made changing. CONSTITUTION:A temperature controller 6 is composed of an arithmetic circuit 25 calculating a required blowoff temperature through a temperature setting lever 27, an inner air temperature sensor 28 and an outside temperature sensor 29, and a comparator 26 controlling an air mix door actuator 18 according to a deviation between the required blowoff temperature and a blowff air temperature detected by three blowoff temperature sensors 30-32. In addition, when an alteration from a face supply opening mode to a foot supply opening mode is indicated, a temperature control period is reset at a time when changing from the face supply opening mode to the foot supply opening mode after controlling the air mix door actuator 18 according to a deviation between the required blowoff temperature and a blowoff air temperature detected by the blowoff temperature sensor 30 in the face supply opening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optimum vehicle air conditioner for use in an automatic air conditioner for automatically controlling temperature control in a vehicle compartment.

[0002]

2. Description of the Related Art Conventionally, in an air conditioner for a vehicle, a calculation unit for calculating a required blowout temperature based on a set temperature, an inside temperature, and an outside temperature, and a required blowout temperature calculated by this calculation unit are designated. In comparison with the blowout air temperature detected by the blowout temperature sensor of the blowout port that is opened in the blowout port mode, a temperature control unit having a comparison unit that adjusts the opening degree of the air mix door so that the difference between them is zero. It is known to have a tone control circuit. In general, the opening degree of the air mix door is adjusted every preset temperature control cycle, and the mode change of the outlet mode is performed even during the temperature control cycle.

[0003]

However, in the conventional vehicle air conditioner, when the mode change of the outlet mode is instructed and the mode of the outlet mode is changed by opening and closing the door provided at each outlet. , For example, when the face outlet mode is changed to the foot outlet mode, depending on the timing of the temperature control cycle and the mode change timing,
An airflow with a temperature greatly different from the originally required blowout temperature is blown out from the foot outlet after the mode change. This is because the outlet air temperature sensor of the foot outlet, which was blocked in the face outlet mode, detects the ambient temperature in the face outlet mode, and the temperature of the outlet temperature sensor of the foot outlet is changed immediately after the mode is changed. Even if the signal is read, it takes time for the blowout temperature sensor at the foot outlet to reach the blowout air temperature of the air flow blown out from the actual foot outlet due to the response delay of the blowout temperature sensor. Therefore, a deviation occurs between the actual blown air temperature of the foot outlet and the temperature signal output by the blowout temperature sensor.

Therefore, the conventional vehicle air conditioner moves the air mix door excessively when it determines that the deviation between the required outlet temperature and the outlet air temperature of the outlet temperature sensor is quite large when the mode is changed. For this reason, there has been a problem that an airflow having a blowout air temperature largely deviated from the originally required blowout temperature is blown out from the blowout port after the mode change, which may lead to hunting of the air mix door in some cases. The deviation becomes larger as the temperature control cycle and the mode change timing are closer to each other. An object of the present invention is to provide an air conditioner for a vehicle that prevents an airflow having an outlet air temperature that is largely deviated from the original required outlet temperature from being blown out from the outlet after the mode change.

[0005]

According to the present invention, there is provided a blower duct having a plurality of air outlets through which air flows toward a vehicle compartment, and a temperature adjusting means for adjusting the temperature of air blown out from the plurality of air outlets. Mode changing means for changing to a plurality of modes an outlet mode in which only some of the plurality of outlets are opened, and environment detection for detecting a temperature environment inside the vehicle such as a set temperature, an inside temperature, an outside temperature, etc. Section, a plurality of blowout temperature detection units that are respectively provided in the plurality of blowout ports and detect the temperature of blowout air blown out from the blowout ports, and a control unit that has an instruction unit that instructs a mode change of the blowout port mode. It adopts the technical means with and. In addition,
The control means, during the preset temperature control cycle,
When the instruction section instructs the mode change of the outlet mode, the required outlet temperature is calculated based on the temperature environment in the vehicle compartment detected by the environment detector, and the calculated required outlet temperature and the mode change. Before the operation, the temperature adjusting means is controlled based on the deviation from the outlet air temperature detected by the outlet temperature detecting portion of the outlet opening in the outlet mode, the mode changing means is controlled, and the instruction portion is instructed. The technical means for resetting the temperature control cycle is adopted at the time when the mode is changed so as to become the specified outlet mode.

[0006]

According to the present invention, when the instruction section instructs the mode change of the outlet mode in the middle of the temperature control cycle, the required outlet temperature is calculated based on the temperature environment in the vehicle compartment detected by the environment detecting section. It Then, the temperature adjusting means is controlled based on the deviation between the calculated required outlet temperature and the outlet air temperature detected by the outlet temperature detector. At this time, the blown air temperature is
Since the temperature detected by the outlet temperature detector of the outlet opening in the outlet mode before changing the mode is used, the temperature of the outlet air blown out from the outlet opening in the outlet mode after changing the mode is required. The temperature is close to the blowing temperature. Further, by resetting the temperature control cycle at the time when the mode changing means is controlled to change the mode to the outlet mode instructed by the instruction section, the temperature control cycle starts counting from this time. Therefore, even if the temperature control cycle and the mode change timing are close to each other, the response delay of the blowout temperature detection unit at the outlet opening after the mode change is earned, so that the actual blown air at the next temperature control is controlled. The deviation between the temperature and the originally required blow-out temperature after the mode change is small.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle air conditioner of the present invention will be described based on an embodiment shown in the drawings. FIG. 1 is a block diagram showing a temperature control device for an automobile air conditioner to which an embodiment of the present invention is applied, and FIG. 1 is a schematic diagram showing an automobile air conditioner to which an embodiment of the present invention is applied. It is a figure. The vehicle air conditioner 1 is an automatic air conditioner that automatically controls the temperature adjustment in the passenger compartment, and includes a blower 2, a blower duct 3, a temperature adjusting unit 4, a mode changing unit 5, and a temperature control unit 6.
Etc. The blower 2 generates an air flow toward the vehicle interior in the blower duct 3 and is rotationally driven by a blower motor 7 arranged outside the blower duct 3.

The blower duct 3 has an inlet 8 on the windward side and a face outlet 9, a foot outlet 10 and a differential outlet 11 on the leeward side. The inlet 8 is an opening for introducing the inside air or the outside air into the inside by the operation of the blower 2. The face outlet 9 is an opening that blows an air flow toward the upper half of the body of the vehicle occupant, and is formed at the end of the face duct 12 extending from the main body of the blower duct 3. The foot outlet 10 is an opening that blows out an air flow toward the feet of the vehicle occupant, and is formed at the end of a foot duct 13 extending from the main body of the blower duct 3. Differential outlet 1
Reference numeral 1 denotes an opening that blows out an air flow toward the inner surface of the windshield of an automobile, and is formed at the end of a diff duct 14 that extends from the main body of the blower duct 3.

The temperature adjusting means 4 comprises an evaporator 15, a heater core 16, an air mix door 17 and an actuator 18. The evaporator 15 is housed in the blower duct 3 and includes a compressor (not shown),
A refrigeration cycle is configured with a condenser (not shown), a pressure reducing device (not shown), and the like. This evaporator 15
Is a cooler that cools the air by heat-exchanging the mist-like refrigerant that has been adiabatically expanded by the decompression device and that has flowed in with the air flowing in the blower duct 3. The heater core 16 is the evaporator 15
It is housed in the blast duct 3 on the leeward side, and constitutes a hot water circuit together with an internal combustion engine (not shown), a water pump (not shown), a hot water valve (not shown), and the like. This heater core 1
Reference numeral 6 denotes a heater that heats the air by opening the hot water valve so as to exchange heat between the hot water flowing in and the air flowing in the blower duct 3. The air mix door 17 is disposed on the windward side of the heater core 16, and by changing the opening degree, the warm air that has passed through the evaporator 15 and heated through the heater core 16 and the evaporator 15 are bypassed to bypass the heater core 16. The temperature of the air blown into the passenger compartment is adjusted by adjusting the distribution amount with the cold air. The actuator 18 is composed of a fluid pressure servo motor, an electric motor, or the like, and based on the temperature adjustment control signal output from the temperature adjustment control device 6, the actuator is moved from the solid line position (fully open position) shown in FIG. The air mix door 17 is driven in the range of the fully closed position).

The mode changing means 5 includes a face door 19,
It is composed of a foot door 20, a differential door 21, and actuators 22 to 24. The face door 19 is
It has a plate-like shape, is rotatably supported in the face duct 12, and opens and closes the face outlet 9. Foot door 20
Has a plate shape, is rotatably supported in the foot duct 13, and opens and closes the foot outlet 10. Differential door 21
Has a plate shape, is rotatably supported in the differential duct 14, and opens and closes the differential outlet 11. Actuator 22
2 to 24 are constituted by fluid pressure servo motors, electric motors, etc., and based on the mode change signal output from the temperature control device 6, in FIG. The face door 19, the foot door 20, and the differential door 21 are driven in the range of the closed position). In this embodiment, the actuator 2
2 to 24, the mode is changed to the face outlet mode, the bi-level outlet mode, the foot outlet mode, the foot differential outlet mode, and the differential outlet mode.

The temperature control device 6 is the control means of the present invention, and comprises an arithmetic circuit 25 for calculating the required outlet temperature and a comparison circuit 26 for comparing the required outlet temperature with the outlet air temperature. The arithmetic circuit 25 calculates a required outlet temperature based on the temperature environment from the temperature setting lever 27, the inside air temperature sensor 28, and the outside air temperature sensor 29, and compares the temperature control signal corresponding to the calculated required outlet temperature with a comparison circuit. To 26. When the required outlet temperature changes due to a change in the temperature environment or a change in the set temperature, a temperature control signal corresponding to the calculated required outlet temperature is output to the comparison circuit 26, and when the mode needs to be changed. A mode change signal is output to the actuators 22-24. Further, in the present embodiment, the change of the outlet mode means the mode fixing switch 33 to the vehicle occupant.
The case where the operation of 37 instructs a blowout port mode different from the blowout port mode input before the mode change is also included. The comparison circuit 26 opens at the required outlet temperature calculated by the arithmetic circuit 25 and the instructed outlet mode at every temperature control cycle (for example, 4 seconds) set by the temperature control timer (not shown). Comparing the temperature of air blown from the blowout temperature sensors 30 to 32 provided at the blowout port, a temperature control signal is output to the actuator 18 so that the difference between the two becomes 0 (so-called blowout temperature feedback control). ). If the mode change is instructed even during the temperature control cycle, the necessary outlet temperature calculated by the arithmetic circuit 25 and the outlet temperature sensor 30 at the outlet opened before the mode change.
The temperature control control signal is output from the comparison circuit 26 to the actuator 18 so that the difference between the two is compared with the temperature of the air blown from the air conditioners 32 to 32.

The temperature setting lever 27 is an environment detecting portion of the present invention and is arranged on an air conditioner operation panel (not shown) mounted on the front surface of the vehicle compartment. The temperature setting lever 27 is, for example, a variable resistor and is manually operated to set the temperature inside the vehicle compartment to a desired temperature (set temperature). The inside air temperature sensor 28 is the environment detecting unit of the present invention, and is arranged at a predetermined position in the vehicle compartment. The inside air temperature sensor 28 is a temperature sensor such as a thermistor, and detects the temperature inside the vehicle (inside air temperature). The outside air temperature sensor 29 is the environment detecting unit of the present invention, and is arranged at a predetermined position outside the vehicle compartment. The outside air temperature sensor 29 is a temperature sensor such as a thermistor, and detects the temperature outside the vehicle cabin (outside air temperature). The blow-out temperature sensors 30 to 32 are blow-out temperature detectors of the present invention, and are arranged in the face duct 12, the foot duct 13, and the differential duct 14, respectively. These blowout temperature sensors 30 to 32 are temperature sensors such as thermistors, and detect the temperature of blown air blown from the face outlet 9, the foot outlet 10, and the differential outlet 11, respectively. The mode fixing switches 33 to 37 are an instruction unit of the present invention, and are arranged on the air conditioner operation panel, and when turned on (on), the face outlet mode, the bi-level outlet mode, the foot outlet mode, the foot differential outlet. It is a button switch for instructing the mode and the differential air outlet mode.

FIG. 3 is a flow chart showing an example of control of the temperature control device 6. First, it is determined whether or not the same air outlet mode (Ma) as the previous time is instructed by the mode fixing switches 33 to 37 or the temperature environment and the temperature setting change (step S1). When the result of the determination in step S1 is Yes, it is determined whether or not it is the temperature control period (for example, every 4 seconds) (step S2). If the determination result in step S2 is No, step S1
Control. If the result of determination in step S2 is Yes, the set temperature (Ts) set by the temperature setting lever 27, the inside temperature (Ti) detected by the inside temperature sensor 28, and the outside temperature sensor 29 are detected. Outside temperature (T
o) is read (step S3). Then, the required outlet temperature (TAO) is calculated from the set temperature (Ts), the inside temperature (Ti), and the outside temperature (To) (step S4), and the outlet temperature provided at the outlet opening in the outlet mode (Ma) is calculated. The blown air temperature (Tr) is read from the sensors 30 to 32 (step S5). Then, the deviation between the required outlet air temperature (TAO) and the outlet air temperature (Tr) is compared, and a temperature control signal corresponding to this deviation is output to the actuator 18 (step S6), after which the control of step S1 is performed. To do.

Further, the judgment result is N in step S1.
In the case of o, the set temperature (Ts) set by the temperature setting lever 27 and the inside temperature (T) detected by the inside temperature sensor 28
i), the outside air temperature (To) detected by the outside air temperature sensor 29,
And the air outlet mode (Mb) for which there is a mode change instruction among the mode fixing switches 33 to 37 is read (step S7). Then, the set temperature (Ts) and the internal temperature (T
i), the required outlet temperature (TAO) is calculated from the outside air temperature (To) (step S8), and the outlet temperature sensor 30 of the outlet opening in the outlet mode (Ma) before the mode change.
The blown air temperature (Tr) from 32 is read (step S9). Then, the deviation between the required outlet air temperature (TAO) and the outlet air temperature (Tr) is compared, and a temperature control signal corresponding to this deviation is output to the actuator 18 (step S1).
0), a mode change signal is output to the actuators 22 to 24 so as to be in the outlet mode (Mb) after the mode change (step S11), and the outlet mode (Mb) is set as the previous outlet mode (Ma). Remember (step S1
2) Reset the temperature control timer (step S1
3) Then, the control of step S1 is performed.

The operation of the temperature control device 6 of the automobile air conditioner 1 at the time of mode change will be briefly described with reference to FIGS. 1 to 3. [When there is an instruction to change the mode] Mode fixing switch 33
When the vehicle occupant is turned on, the face door 19 is set to the solid line position (fully open position) shown in FIG. 2, and the foot door 20 and the differential door 21 are set to the two-dot chain line position (fully closed position) shown in FIG. As a result, the air flow is blown from the face outlet 9 toward the vehicle occupant. At this time, when the vehicle occupant turns on the mode fixing switch 35, the arithmetic circuit 25 of the temperature control device 6
Is instructed to change the mode to the foot outlet mode. Therefore, in the arithmetic circuit 25, the required blowout temperature is calculated from the set temperature set by the temperature setting lever 27, the inside air temperature detected by the inside air temperature sensor 28, and the outside air temperature detected by the outside air temperature sensor 29.

When the mode change to the foot outlet mode is instructed, the comparator circuit 26 opens in the face outlet mode before the mode change even during the temperature control period being measured by the temperature control timer. Face outlet 9
The temperature difference control signal is output to the actuator 18 by comparing the deviation between the blown air temperature from the blowout temperature sensor 30 and the required blowout temperature so that the deviation becomes zero. For this reason,
By adjusting the opening degree of the air mix door 18, the ratio of the amount of cold air passing through the evaporator 15 and bypassing the heater core 16 to the amount of warm air passing through the heater core 16 is adjusted so that the blown air temperature becomes the required blown temperature. Get closer. Here, when the outlet air temperature is higher than the required outlet temperature,
By outputting a control signal to the actuator 18 so as to drive the air mix door 17 in the clockwise direction in FIG. 2, the amount of cool air passing through the evaporator 15 and bypassing the heater core 16 is increased to lower the blown air temperature. Let When the blown air temperature is lower than the required blown temperature, the control signal is output to the actuator 18 so as to drive the air mix door 17 in the counterclockwise direction in FIG. 2, thereby changing the amount of warm air passing through the heater core 16. Increase to raise the temperature of blown air. Then, when the blown air temperature and the required blown temperature match (deviation is 0), a control signal is output to the actuator 18 so as to stop the driving of the air mix door 17. After that, by outputting the mode change signal to the actuators 22 to 24, the foot door 20 is driven to the solid line position (fully open position) shown in FIG.
The differential door 21 is driven to the position shown by the chain double-dashed line in FIG. 2 (the fully closed position), and the mode is changed to the foot outlet mode. In this way, by resetting the temperature control timer at the time when the temperature control in the passenger compartment and the switching control of the air outlet are performed, the time control of the temperature control cycle is restarted from this time.

Therefore, the temperature of the blown air used for controlling the temperature when changing the mode uses the temperature detected by the blowout temperature sensor 30 of the face outlet 9 that opens in the face outlet mode before changing the mode. ing. For this reason,
The temperature of the blown air blown out from the foot blowout port 10 after the mode change can obtain a temperature close to the required blowout temperature without waiting for the response delay of the blowout temperature sensor 31. Further, even if the temperature control cycle and the mode change timing are remarkably close to each other by increasing the response delay of the blow-out temperature sensor 31 of the foot outlet 10 that opens after the mode change, at the next temperature control control. The deviation between the actual blown air temperature and the original required blown air temperature after the mode change is small. That is, it is possible to prevent the comparison circuit 26 from erroneously determining that the temperature of the blown air of the air blown from the foot blowout port 10 deviates greatly from the required blowout temperature, so that the air mix door 17 is moved excessively. There is no fear. As a result, it is possible to prevent the air flow having the air temperature greatly deviated from the originally required air outlet temperature from being blown from the foot air outlet 10 after the mode change,
In addition, hunting of the air mix door 17 can be prevented.

Here, the same operation is performed when changing modes between the other outlet modes. For example, when a mode change to the differential foot outlet mode is instructed, the foot door 20 and the differential door 21 are moved to the solid line position (fully open position) shown in FIG. The face door 19 is driven to the two-dot chain line position shown in FIG. 2 (fully closed position) to change the mode to the differential foot outlet mode. Further, when the mode change to the differential air outlet mode is instructed, the differential door 21 is moved to the position indicated by the solid line (fully open position) in FIG.
The face door 19 and the foot door 20 are driven to the two-dot chain line position (fully closed position) shown in FIG. 2 to change the mode to the diff outlet mode. Furthermore, when the mode change to the bi-level outlet mode is instructed, the face door 19 and the foot door 20 are moved to the solid line position (the fully open position) shown in FIG. ), And the differential door 21 are driven to the two-dot chain line position (fully closed position) shown in FIG. 2 to change the mode to the bi-level outlet mode.

[No Mode Change Instruction] When no mode change instruction is given, the comparison circuit 26 causes the comparison circuit 26 to blow out the outlet temperature sensor in the current face outlet mode at every temperature control cycle counted by the temperature control timer. The air mix door 1 is operated by comparing the deviation between the temperature of air blown from 30 and the required air temperature calculated by the arithmetic circuit 25, and outputting a temperature control signal to the actuator 18 so that this deviation becomes zero.
By adjusting the opening of 7, the face outlet 9
The temperature of the air flow blown out from the device becomes close to the required blowing temperature.

In this embodiment, the mode fixing switches 33-
Although 37 is the indicator, in the case of an automatic air conditioner that automatically controls the switching of outlets, the temperature setting lever 2
7. The inside air temperature sensor 28 and the outside air temperature sensor 29 may be used as the instruction unit. In this case, the arithmetic circuit 25 is
When the inside air temperature or the outside air temperature greatly changes, the required outlet temperature changes and the instruction to change the mode of the outlet mode is automatically output. In the present embodiment, the required outlet temperature is calculated based on the temperature environment such as the set temperature, the inside air temperature and the outside air temperature, and the outlet mode. However, as the temperature environment, one or more of the cooling water temperature and the insolation amount is added. The required blowout temperature may be calculated based on the measured value. In the present embodiment, the temperature adjusting means is composed of the air mix door and the temperature adjusting actuator, but the temperature adjusting means may be composed of a flow rate adjusting device such as a hot water valve for adjusting the hot water flow rate of the hot water circuit, or the heater core. It may be configured by a temperature control actuator that changes the angle with respect to the air duct.

[0021]

According to the present invention, it is possible to prevent an erroneous determination that the temperature of the blown air of the airflow blown out from the blowout port after the mode change is greatly deviated from the required blowout temperature. It is possible to prevent the control. As a result, it is possible to prevent the airflow having a blown air temperature greatly deviated from the originally required blowout temperature from being blown out from the blowout port after the mode change.

[Brief description of drawings]

FIG. 1 is a block diagram to which an embodiment of the present invention is applied.

FIG. 2 is a schematic diagram to which an embodiment of the present invention is applied.

FIG. 3 is a flowchart showing an example of control of a temperature control device to which an embodiment of the present invention is applied.

[Explanation of symbols]

 1 Air Conditioner for Automobile 3 Blower Duct 4 Temperature Adjusting Means 5 Mode Changing Means 9 Face Outlet 10 Foot Outlet 11 Def Outlet 15 Evaporator 16 Heater Core 17 Air Mix Door 19 Face Door 20 Foot Door 21 Def Door 27 Temperature Setting Lever (Environment Detecting part 28 Internal temperature sensor (environment detecting part) 29 Outside air temperature sensor (environment detecting part) 30 Blowout temperature sensor (blowout temperature detecting part) 31 Blowout temperature sensor (blowout temperature detecting part) 32 Blowout temperature sensor (blowout temperature detecting part) ) 33 mode fixing switch (instruction section) 34 mode fixing switch (instruction section) 35 mode fixation switch (instruction section) 36 mode fixation switch (instruction section) 37 mode fixation switch (instruction section)

Claims (1)

[Claims] 1. A blower duct including: (a) a plurality of air outlets through which air flows toward the passenger compartment; (b) a temperature adjusting means for adjusting the temperature of air blown out from the plurality of air outlets; ) Mode changing means for changing the outlet mode in which only some of the plurality of outlets are opened to a plurality of modes, and (d) the temperature environment inside the vehicle such as the set temperature, the inside temperature, and the outside temperature. An environment detecting unit for detecting, a plurality of blowout temperature detecting units provided in each of the plurality of blowout ports for detecting the temperature of blown air blown out from each blowout port, and an instruction unit for instructing a mode change of the blowout port mode If a change of the outlet mode is instructed by the instruction unit during a preset temperature control cycle, it is necessary based on the temperature environment inside the vehicle detected by the environment detection unit. Calculate outlet temperature , The temperature adjusting means is controlled based on the deviation between the calculated required outlet temperature and the outlet air temperature detected by the outlet temperature detector of the outlet opening in the outlet mode before the mode is changed, and the mode is changed. An air conditioner for a vehicle, comprising: a control unit that resets the temperature control cycle at a time point when the mode is changed to the outlet mode instructed by the instruction unit by controlling the unit.