JPS6223218B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioning control device that mainly controls temperature of an air conditioning device.

Temperature detectors commonly used in conventional air conditioners have a certain time constant, and the time constant is set so as to satisfy the most frequently used control conditions of the air-conditioned area. Therefore, when the control state of the air conditioner or the state of the heat load factor of the environment in which the air conditioner is placed (collectively referred to as the air condition) changes, the temperature sensor will not function properly before or after the change. Temperature is always detected using a constant time constant. In addition, temperature detectors are generally arranged to detect the temperature of a limited area, and in a control system that uses the detection signal of this temperature detector, the above-mentioned changes in the air conditioning state are localized and There has been a problem in that the overall air conditioning capacity changes even when the air conditioner changes temporarily or even temporarily, making it impossible to perform stable air conditioning control.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioning control device that can solve these problems and stably control the temperature of an air-conditioned area to a desired state.

In order to achieve this object, the present invention includes an air conditioning blower installed in an air conditioning duct whose downstream end opens into the vehicle interior, and a temperature control of the air introduced into the air conditioning duct by the air conditioning blower. A vehicle air conditioning control device having a temperature adjustment means, comprising: a temperature detection duct whose upstream side communicates with the vehicle interior; a temperature detection blower that introduces air inside the vehicle interior into the temperature detection duct; an inside temperature sensor disposed inside the duct and detecting the air temperature inside the duct as a representative temperature inside the vehicle; and controlling the adjustment amount of the temperature adjustment means based on the temperature detected by the inside temperature sensor. a temperature control circuit; an air conditioning state detection means for detecting that an air conditioning state that causes a disturbance in the temperature distribution in the vehicle interior has been selected; and the air conditioning state is selected based on a detection result of the air conditioning state detection means. and a temperature detection control circuit that outputs a control signal for reducing the amount of air blown by the temperature detection blower for a predetermined period of time based on the determination result.

An embodiment in which the present invention is applied as a control device for an air conditioner for an automobile will be described below. FIG. 3 shows the overall configuration, in which an inside air suction port 11 and an outside air suction port 12 are formed as air introduction ports (suction ports) on the upstream side of a ventilation duct 10 arranged at the front of the vehicle compartment. , both suction ports are opened and closed by a damper 13. The ventilation duct 10 includes, toward the downstream side, a blower motor 14, a cooler 15 consisting of an evaporator of a refrigeration cycle (not shown), a heater core 16 whose heat source is engine cooling water, and air passing through the heater core 16 and air passing through a bypass passage 17. An air mix damper 18 is provided as a temperature control means for adjusting the ratio between the two. At the most downstream side of the ventilation duct 10, there are an upper outlet 19, a lower outlet 20, and a damper 21 that opens and closes both outlets.
is provided.

Each element arranged in the ventilation duct 10 is provided for air conditioning, which mainly controls the temperature inside the vehicle, by a control device described below.

Adjustment levers 1a and 1b provided on the operation panel 1 installed in front of the driver's seat are for opening and closing the air outlet and opening and closing the suction port, and are connected to wires 21a, 21b, 13a, 13b and link mechanism 21c, respectively. The dampers 21 and 13 are driven through the dampers 13c and the like. 18a is a negative pressure actuator driven by an electromagnetic valve that drives the air mix damper 18 in response to an electric signal. This negative pressure actuator 18
The control unit 2 comprehensively performs electrical control for temperature adjustment, which controls the temperature a and changes the opening degree of the air mix damper 18.

As means for providing control conditions to the control unit 2, a temperature setting device 2a, an inside temperature sensor 3, an outside temperature sensor 4, an air mix damper opening sensor 5, an outlet switching signal generator 6, and a door switch 7 are connected. . The inside temperature sensor 3 is made of a thermistor and is installed in a ventilation duct 8 that opens to the temperature measurement area, that is, the passenger compartment, on the upstream side, and a small blower motor 9 that is installed downstream of this duct 8. Exposure to draft atmosphere. A portion of the air discharged from the duct 8 through the holes 8a and 8b is designed to cool the heat sink 2b of the power amplification element in the control unit 2. The outside temperature sensor 4 and the opening sensor 5 may be of known type. The air outlet switching signal generator 6 consists of a movable contact 6a that moves in the direction of the outlined arrow in conjunction with the adjustment lever 1a, and a fixed contact 6b located at the center of the movement range of this contact.
An opening/closing signal is generated when the adjustment lever 1a is operated from up to down or down to up. The door switch 7 generates an opening/closing signal depending on whether the vehicle door next to the driver's seat is open or not.

The electrical control system will be explained with reference to FIG. Reference numeral 22 denotes a known temperature control circuit, which has an amplifier circuit whose input resistances are the sensors 3, 4, and 5 and the setting device 2a (variable resistor). Reference numeral 23 is a timer circuit which uses the air outlet switching signal generator 6 and the door switch 7 as trigger switches, and a relay coil 24 is connected when either of them is closed and for a certain period of time after the closed state is released. The normally closed contact 25 is opened by applying force. 26 is an amplifier circuit whose amplification gain can be adjusted by resistors 26a and 26b, one of which is short-circuited by a relay contact 25. 27
is a power amplification transistor which changes the current flowing through the sensor blower motor 9 in accordance with the output voltage of the amplification circuit 26, thereby changing the motor rotation speed and therefore the amount of airflow inside the duct 8. Note that the heat sink 2b of this transistor is cooled by the blower motor 9 mentioned above. 28 is an in-vehicle battery, 29 is a key switch, and 30 is a temperature control switch. Although not shown, when the switches 29 and 30 are closed, the blower motor 14 in the duct 10 and the electromagnetic actuator (not shown) of the refrigeration cycle connected to the cooler core (evaporator) 15 are energized. There is.

In the above configuration, when the key switch 29 and the air conditioning switch 30 are closed, the air conditioner operates through the negative pressure actuator 18a to maintain the vehicle interior temperature at the temperature set by the setting device 2a by the action of the temperature control circuit 22. and drives the air mix damper 18.

Here, operate the adjustment lever 1a to open the air outlet 19,
If the opening/closing relationship of the air conditioner 20 is reversed, turbulence will occur in the airflow near the outlet at the front of the passenger compartment, and the temperature distribution will also be turbulent. However, according to this device, when switching the opening and closing of the air outlet, the signal generator 6 closes for a moment and then opens again, so the relay coil 24 is energized for a certain period of time after this opening, and the relay contact 25 is then opened. do. Therefore, only during this time, the amplification gain of the amplifier circuit 26 becomes small, the base bias of the power amplifying transistor 27 decreases, and the rotation speed of the sensor blower motor 9 decreases by a certain amount. Therefore, the speed at which a change in the vehicle room temperature, here a temperature change near the operation panel 1 at the front of the vehicle interior, is transmitted to the inside temperature sensor 3 in the duct 8 becomes slower. Therefore, the response speed of the interior temperature sensor 3 to temperature fluctuations at the front of the vehicle interior due to switching of the air outlet is slowed down, and as a result, the temperature control circuit 22 can stably control the air mix without sudden fluctuations in output. The damper 18 is driven.

After a certain period of time has elapsed, the turbulence in the airflow caused by switching the outlet is almost eliminated. At this time, the timer circuit 23 deenergizes the relay coil, closes the contact 25, and returns the amplification gain of the amplifier circuit 26 to its normal value. As a result, the rotation speed of the sensor blower motor 9 increases, and the sensor blower motor 9 follows changes in the vehicle room temperature at a sufficient speed.

Furthermore, when the vehicle door is opened, the switch 7 closes, and the rotation speed of the sensor blower motor 9 decreases while the door is open and for a certain period of time after the door is closed, thereby reducing the response to temperature fluctuations at the front of the vehicle compartment. Adjust.

Thus, in the device described in the embodiment, the temperature adjustment amount is made to respond slowly to temperature fluctuations around the installation location of the inside air temperature sensor 3, so that temperature control of the entire vehicle interior can be stably performed.

Although the present invention has been described above with respect to one embodiment, it is also possible to implement it by the following modified examples.

(1) If the air outlet is automatically switched by the control device, the rotation speed of the sensor blower motor may be changed based on the switching signal.

(2) If the speed of temperature propagation transmitted to the internal temperature sensor differs depending on the air outlet to be switched, for example because the air outlet is far apart, the sensor blower motor is The rotation speed may also be set.

(3) In a device that can continuously set the switching amount of the air outlet, the rotation speed of the sensor blower motor may be changed depending on the switching amount.

(4) We focused on the switching of the air outlet, the opening and closing of the door, the opening and closing of the window, and the switching of the suction ports 11 and 12 as factors that change the air conditioning status for the internal temperature sensor, and detected the rotation speed of the sensor blower motor based on the detection signal. It may be changed. For example, generally speaking, the amount of air inside the duct 10 increases when the outside air suction port is used as the outside air suction port rather than the inside air suction port, which may cause turbulence in the air flow within the vehicle interior. It can be resolved.

(5) In addition to changing the gain of the amplifier circuit described above, the rotation speed of the sensor blower motor may be changed by changing the value of the current limiting resistor provided in the energization circuit of the sensor blower motor.

(6) A constant voltage circuit may be provided so that the rotation speed of the sensor blower motor does not change due to changes in the power supply voltage. Further, a feedback circuit may be provided that detects the rotational speed and controls the detected value so that it matches the target value.

(7) The electrical control system is constructed by interconnecting electrical parts as shown in Figure 2, and also includes a timer circuit 23.
The temperature adjustment circuit 22 may also be configured to be programmed by a digital computer.

As described above, in the present invention, when an air conditioning condition that causes a disturbance in the temperature distribution in the vehicle interior is selected, the air flow rate of the temperature detection blower is reduced for a predetermined period of time, and the fluctuated temperature in the vehicle interior is reduced. Since the supply to the inside temperature sensor is suppressed, it is not affected by temporary temperature fluctuations inside the vehicle.
This has the excellent effect of stably controlling the average temperature inside the vehicle.

[Brief explanation of the drawing]

The attached drawings show one embodiment of the present invention.
The figure is an overall configuration diagram, and FIG. 2 is an electrical wiring diagram of the electrical control system. 3...Inside temperature sensor serving as temperature detection means, 6,
7... Outlet switching signal generator and door switch for detecting changes in air conditioning status, 9... Blower motor serving as air volume adjustment means, 10... Ventilation duct, 1
5, 16... Cooler core and heater core forming heat exchange means, 18... Air mix damper forming temperature control means, 18a, 22... Negative pressure actuator and temperature control circuit forming control section.

Claims (1)

[Claims] 1. An air conditioning blower is installed in an air conditioning duct whose downstream end opens into the vehicle interior, and air that is introduced into the air conditioning duct by the air conditioning blower and sent out into the vehicle interior. A vehicle air conditioning control device having a temperature control means for controlling temperature includes a temperature detection duct whose upstream side communicates with the vehicle interior, and a temperature detection blower which introduces air from the vehicle interior into the temperature detection duct. , an interior temperature sensor disposed in a temperature detection duct and detecting the air temperature in the duct as a representative temperature in the vehicle interior; and adjustment of the temperature adjustment means based on the temperature detected by the interior temperature sensor. a temperature control circuit that controls the temperature distribution; an air conditioning state detection means that detects that an air conditioning state that causes disturbance in the temperature distribution in the vehicle interior has been selected; a temperature detection control circuit that determines that the temperature detection blower has been selected and outputs a control signal that reduces the air flow rate of the temperature detection blower for a predetermined period of time based on the determination result. Device.