JPS6229294Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a control device for an automobile interior/exterior air switching door.
The present invention relates to a device that efficiently warms up a vehicle.

In general, a vehicle air conditioner introduces inside air (air inside the vehicle) and outside air into a duct, an outside air switching door, a blower that sends air from the inside/outside air switching door side to the evaporator, and cold air cooled by the evaporator. It consists of an air mixer door, etc. that adjusts the mixing ratio of the warm air heated by the heater core and the warm air heated by the heater core. The inside/outside air switching door can be switched to either inside air introduction mode or outside air introduction mode by operating either an inside air introduction mode setting switch or an outside air introduction mode setting switch installed on the control panel.

However, according to conventional vehicle air conditioners, when warm-up operation is performed with the inside/outside air switching door set to the outside air introduction mode, cold air from outside is introduced, causing the temperature of the engine coolant to warm up. This has disadvantages in that the warm-up operation is delayed, and the warm air inside the vehicle escapes to the outside, making it impossible to quickly heat the interior of the vehicle. Particularly, when warm-up operation is performed in a closed space such as a garage, exhaust gas enters the vehicle interior through the interior/exterior air switching door, which poses a disadvantage to the health of the occupants.

To deal with this, it is conceivable that the occupants always set the inside/outside air switching door to the inside air introduction mode during warm-up operation, but when the inside surface of the window glass is foggy, the inside air introduction mode Humidity will not decrease and it will become even more cloudy.

The purpose of this invention is to install a condensation sensor on the inner surface of the window glass that directly detects cloudiness on the inner surface of the window glass, and to detect when no condensation is occurring and when the engine coolant temperature is low. This is to eliminate the above-mentioned drawbacks by setting the inside/outside air switching door to the inside air introduction mode when the air temperature is low, and will be described in detail below using examples.

FIG. 1 is a circuit diagram showing an embodiment of a control device for an automobile interior/exterior air switching door according to the present invention. In the figure, an ignition switch 2 is connected to a power source 1; An outside air introduction mode setting switch 3 and an inside air introduction mode setting switch 4 are connected. The setting switch 3 is connected via a normally closed contact 5 to a contact 7 which is linked to a motor 6. The setting switch 4 is connected to a contact 8 which is linked to a motor 6. The motor 6 is for controlling the inside/outside air switching door, and when the position of this motor 6 corresponds to the position where the inside/outside air switching door is set to the outside air introduction mode, the contact 7 is turned off and the input to the motor 6 is turned off. The motor 6 is stopped at this position. Further, when the position corresponds to setting the inside/outside air switching door to the inside air introduction mode, the contact 8 is turned off and the motor 6 is stopped at this position. A normally open contact 9 is connected in parallel to the inside air introduction mode setting switch 4, and the contacts 5 and 9 are controlled by a relay 10. Reference numeral 11 denotes a dew condensation sensor, which is attached to the inner surface of the window glass of a car. One end of the sensor is connected to the power supply side, the other end is grounded through a resistor 12, and the condensation sensor is output from the connection point with the resistor 12. The output voltage VS is supplied to the negative input side of the comparator 13. A reference voltage VE corresponding to the fogging level is supplied to the positive input side of the comparator 13. The output of the comparator 13 is supplied to the base side of the transistor 15 via the resistor 14, and is connected to the collector of the transistor 15 and the ignition switch 2.
A switch 16 for detecting the temperature of the engine cooling water is connected between the engine and the engine. The switch 16 is turned on when the temperature of the engine cooling water is lower than the set temperature. The emitter side of the transistor 15 is grounded via the relay 15.

The operation of the control device for an automobile interior/exterior air switching door having the above configuration will be described below. First, if the temperature of the engine has not reached the set temperature immediately after starting the engine, that is, even if the switch 16 that detects the temperature of the engine cooling water is turned on, if there is no condensation on the inner surface of the glass, the above Since the output voltage VS is smaller than the reference voltage VE, the output of the comparator 13 becomes H level, which turns on the transistor 15, energizes the relay 10, turns off the contact 5, and turns on the contact 9. Therefore, the inside/outside air switching door is forcibly set to the inside air introduction mode. In this way, when the temperature of the engine coolant is low and there is no fog on the inside of the window glass, the inside air introduction mode is set.
The temperature of the engine coolant increases faster,
Warming-up operation can be performed effectively and the engine can be warmed up quickly. Additionally, it is possible to prevent heat from escaping to the outside of the vehicle during warm-up operation, making it possible to quickly warm up the interior temperature of the vehicle, and furthermore preventing exhaust gas from entering the vehicle interior when warm-up operation is performed in the garage. be able to.

On the other hand, when the engine coolant temperature becomes higher than the set temperature, the switch 16 is turned off and the coil 10 is deenergized, so the contact 5 is turned on and the contact 9 is turned off regardless of whether fogging has occurred. do. Therefore, when the temperature of the engine cooling water exceeds the set temperature, manually turn on the outside air intake setting switch 3 to introduce outside air, and if fog occurs, remove the fog. It can be cleared up.

Next, when the engine coolant temperature is below the set temperature and the switch 16 is on, if fog has occurred on the inner surface of the window glass, the output of the comparator 13 will be at L level, and the transistor 15 will be turned off. However, since the relay 10 is deenergized and the contacts 5 and 9 are in the state shown in the figure, it is possible to clear the fog by manually turning on the outside air introduction switch 3 to introduce dry outside air. can. In this way, if cloudy weather occurs, the outside air introduction mode is set preferentially, so that the cloudy weather can be removed.

FIG. 2 is a circuit diagram showing another embodiment of the control device for an automobile interior/exterior air switching door according to the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals. In this case, the switch 16 is connected in parallel with a series circuit including an occupant detection switch 20 that is turned off when an occupant is seated on the front seat, and a contact 21 that is turned on when the relay 10 is energized. In such a configuration, if the vehicle is warmed up without the occupants sitting in the seats, that is, the vehicle is left unattended, the temperature of the engine coolant may not reach the set temperature, and the inner surface of the window glass may become foggy. When not, the relay 10 is energized, the contact 5 is turned off, the contact 9 is turned on, and the inside/outside air switching door is set to the inside air introduction mode. At this time, the contact 21 is turned on, and since the passenger is not seated, the switch 20 is turned on, so that the transistor 15 is also energized by this self-holding circuit. Next, even after the temperature of the engine cooling water reaches the set temperature or higher and the switch 16 is turned off, the self-holding circuit will maintain the internal air introduction mode unless the occupant is seated and the switch 20 is turned off. continue. Therefore, it is possible to perform a sufficient amount of warm-up operation, prevent exhaust gas from entering the vehicle interior from entering the vehicle interior, and prevent heat inside the vehicle interior from escaping to the outside. The room can be kept sufficiently warm.

However, when cloudiness occurs on the inner surface of the window glass, the output of the comparator 13 becomes L level, so the transistor 15 is turned off, the relay 10 is deenergized, and the contact 5
is turned on, contact 9 is turned off, and the inside air introduction mode is canceled. Further, when the occupant sits on the seat, the switch 20 is turned off, so the relay 10 is deenergized, and the contact 5 is turned on and the contact 9 is turned off, as described above, so that the inside air introduction mode is canceled.

As explained above, according to the control device for an automobile interior/exterior air switching door according to the present invention, when the temperature of the engine cooling water has not reached the set temperature and the inner surface of the window glass is not cloudy, Since the inside/outside air switching door is set to the inside air introduction mode, the vehicle can be warmed up efficiently. In addition, since the fog on the inner surface of the window glass was directly detected using a dew sensor,
Unlike the method shown in No. 163409, which detects the humidity inside the vehicle interior and indirectly determines whether the inside of the window glass is foggy, and then controls the inside/outside air switching door to clear the fog on the inside of the window glass, the fogging judgment can be made with certainty. Become. Also,
When cloudy weather occurs or the temperature of the engine coolant exceeds the set temperature, the internal/external air switching door can be controlled manually. You can take in dry air and clear up cloudy weather.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the control device for an automobile interior/exterior air switching door according to the present invention, and FIG. 2 is a circuit diagram showing another embodiment of the automobile interior/exterior air switching door control device according to the present invention. It is. 3... Inside air introduction setting switch, 4... Outside air introduction setting switch, 5, 9... Contact, 6... Motor,
10... Relay, 11... Condensation sensor, 15...
transistor.

Claims (1)

[Scope of utility model registration request] A switch for setting the actuator for driving the inside/outside air switching door to the inside air introduction mode, a switch for setting it to the outside air introduction mode, a dew condensation sensor provided on the inner surface of the window glass, a water temperature switch that detects the temperature of the engine cooling water, and the above-mentioned The signals from the dew condensation sensor and water temperature switch are judged, and when the inner surface of the window glass is not foggy and the temperature of the engine cooling water has not reached the set temperature, the actuator for driving the inside/outside air switching door is switched to inside air. A control device for an automobile interior/exterior air switching door, comprising a control means for setting an introduction mode.