JPH0478717A - Air conditioner for automobile - Google Patents

Abstract

PURPOSE:To prevent moisture from remaining within a cooling unit by constitut ing the system in such a manner that, when a main switch is turned off while an air conditioner's switch is ON, a fan motor rotates at a high speed for a prescribed period before it stops. CONSTITUTION:When a main switch 2 is turned off while an air conditioner's switch 14 is turned ON so that the air conditioner is in an operating condition, a fan controlling circuit 16 is closed immediately and a fan motor 3 rotates at a high speed for a specified period which is set by a timer circuit 19. With this contrivance, air is sent to a cooling unit at the maximum capacity, so that the moisture, which condenses to stick to an evaporator, is dispersed or dried up. Accordingly, a foul smell can be prevented.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an air conditioner for an automobile.

Conventional technology for air conditioners for automobiles is, for example, disclosed in Japanese Utility Model Application Publication No. 61-2520.
As shown in Publication No. 7, by turning on the main accessory switch or ignition switch, turning on the air conditioner switch, and turning on the fan switch, the blower fan rotates and blows air to the evaporator. At the same time, the compressor is activated and the refrigeration cycle is activated.

Problems to be Solved by the Invention Although a cooling unit incorporating an evaporator has a drainage structure, condensed water inevitably remains on the lower surface of the unit case and on the fins of the evaporator. If moisture remains in the cooling unit in this way, dust, microorganisms, etc. will prey on the bacteria in the moisture and multiply, and the exhaust or odor components in the vehicle interior that have been adsorbed inside the cooling unit will cause the odor. Become. When the ambient temperature rises in this state, the humidity increases during the evaporation process of the residual water, causing an odor that is emitted from the air conditioner unit into the vehicle interior when the refrigeration cycle is restarted.

Therefore, the present invention prevents moisture from remaining in the cooling unit, which causes odor, when the accessory switch or ignition switch is turned off while the air conditioner is in use, and the air conditioner and engine are stopped and the vehicle is left alone. The purpose of the present invention is to provide an air conditioning system for automobiles that can perform the following functions.

Means for Solving the Problems A fan motor drive circuit has a fan switch connected to a main switch to operate a fan motor, and an air conditioner switch connected to the main switch and the fan switch, and the main switch and the fan switch. and a compressor drive circuit that operates the compressor when an air conditioner switch is turned on, the fan motor drive circuit is configured to drive the fan motor when the main switch is turned off while the air conditioner is in use with the air conditioner switch turned on. A fan control circuit is provided that operates at high rotation speed within a predetermined period of time and then stops the fan.

Operation When the main switch (accessory switch) or ignition switch is turned off while the air conditioner is in use with the air conditioner switch turned on, the fan control circuit operates and the fan motor rotates at high speed for a predetermined period of time, causing the blower fan to generate the maximum airflow inside the air conditioner unit. The fan motor automatically stops after a predetermined period of time set by the fan control circuit has elapsed.

Example Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, 1 is a fan motor 3 connected to a main switch 2 such as an ignition switch or an accessory switch. A fan motor drive circuit having a fan switch 4, the fan switch 4 has a pair of band-shaped fixed contacts 5, 6, fixed contacts 7, 8°9.10 for taking out resistors R1, R2, R3, and these fixed contacts. 5, 6, and a movable contact 11 that slides on 7 to 10. That is, this fan motor drive circuit 1 turns on the main switch 2 to change the movable contact 11 of the fan switch 4 to the fixed contact? , 8, 9, or 10 positions to rotate the fan motor 3 at low rotation (Lo), middle low rotation (ML), middle high rotation (MH), or high rotation (Hi). There is.

12 indicates a compressor drive circuit that operates the compressor 13, and an air conditioner switch 14. Air conditioner relay 15
It is equipped with The air conditioner switch 14 is turned on in conjunction with
The relay coil 15a of the air conditioner relay 15 consists of three contacts 14a, 14b and 14c that turn off.
A wire is connected between the ground side terminal of the contact 14a and the power side terminal of the relay contact 14b. Further, the contact 14b is the contact 1
A wire is connected between the power supply side terminal of the contact 14a and the fixed contact 6 of the fan switch 4, and the ground side connection of the compressor 13 is connected to the connection 24 between the ground side terminal of the contact 14b and the fixed contact 6. It is.

That is, this compressor drive circuit 12 connects the movable contact 11 of the fan switch 4 to any one of the fixed contacts 7 to 10 even when the main switch 2 is turned on and the air conditioner switch 14 is turned on. If the fan switch 4 is not turned on, the compressor 13 will not be grounded, and the compressor 13 will not be driven until the fan switch 4 is turned on.

Reference numeral 16 denotes a fan control circuit provided in the fan motor drive circuit 1, which is interlocked with the main switch 2 and has a switch F that turns on when the main switch 2 is turned off, and two contacts 18a and 18b. 18, a timer circuit 19, a switch 20 that turns on and off in conjunction with the fan switch 4, and a contact 14c of the air conditioner switch 14.
It consists of The switch 20 consists of a pair of band-shaped fixed contacts 21.22 and a movable contact 23 that is formed integrally with the movable contact 11 of the fan switch 4 and slides on these fixed contacts 21.22, and the switch 17.
Contact 14c+ of air conditioner switch 14 Switch 20.
Relay coil 18 of timer circuit 19 and relay 18
c and are connected in series. One contact 1 of relay 18
Reference numeral 8a is interposed in the connection 25 that connects the power supply side connection of the fan motor 3 and the ground side terminal of the switch 17. Further, the other contact 18b of the relay 18 is connected to the fan motor 3.
It is interposed between a connection 26 connected between the fan switch 4 and the fixed contact 10 of the fan switch 4, and a connection 28 connected to the ground side connection 27 of the relay coil 18c. Therefore, this fan control circuit 16 is connected to the main switch 2. If you turn off the main switch 2 while using the air conditioner with the air conditioner switch 14 and fan switch 4 on,
When the switch 17 is turned on, the air conditioner switch 14 contacts 14c → fixed contact 21 → movable contact 23 → fixed contact 22 → relay coil 1 via fan control circuit 16
8c is excited and contacts 18a.

i8b are both turned on, the fan motor 3 is rotated at high speed within the time set by the timer circuit 19, and when the predetermined time has elapsed, the timer circuit 19 is turned off, which turns off the relay 18 and turns off both the contacts 18a and 18b. , and the fan motor 3 is stopped.

Therefore, according to the above embodiment, main switch 2. Air conditioner switch 14. When the main switch 2 is turned off while the fan switch 4 is on and the air conditioner is being used, the fan control circuit 16 is immediately closed and the fan motor 3 is rotated at a high speed within the predetermined time of the timer circuit 19. Continue blowing air to the cooling unit at maximum air volume.

As a result, the moisture condensed on the evaporator of the cooling unit or the moisture remaining at the bottom of the cooling unit can be dissipated or dried and discharged to the outside of the cooling unit, thereby eliminating the cause of abnormal odor.

The embodiment shown in FIG. 2 shows a case where the fan control circuit 16 is constructed from a computer control circuit.

The air conditioner usage status is determined by the main switch 2. The on/off state of the air conditioner switch 14 is detected and determined. Main switch 2. The air conditioner switch 14 is connected to a microcomputer 30, and based on the signal indicating that the main switch 2 is switched from on to off and the on signal of the air conditioner switch 14, the microcomputer 30 causes the main switch 2 to turn off and then turn on to a predetermined value. An output signal that causes the fan motor 3 to rotate at high speed is sent out. 31 is an input interface of the microcomputer 30, 32 is a CPU, and 33 is an output interface. Therefore, in this embodiment, the control steps shown in the flowchart of FIG. 3 are adopted.

That is, in step 100, it is determined whether the air conditioner switch 14 is on, and if NO, the process loops to step 100, and if YES, the process moves to step 101. In step 101, it is determined whether the main switch 2 has been switched from the on state to the off state, and if NO, step 10
1, and if YES, the process moves to step 102, where the timer circuit 19 is activated to rotate the fan motor 3 at its maximum speed for a predetermined period of time, and then the fan motor 3 is stopped, and the process ends.

In this embodiment, regardless of whether the fan switch 4 is on or off, if the air conditioner switch 14 is on, it is determined that the air conditioner is in use and the main switch 2 is turned on.
By switching from on to off, the fan motor 3 can be rotated to the maximum for a predetermined period of time. Therefore, even if the fan switch 4 and the main switch 2 are turned off while the passenger is using the air conditioner, the fan motor 3 is rotated to the maximum for a predetermined period of time, and the moisture inside the cooling unit is dissipated to the outside of the cooling unit and dried. , can be discharged.

Effects of the Invention As described above, according to the present invention, when the main switch such as the ignition switch or accessory switch is turned off while the air conditioner is in use, the fan motor is rotated at maximum speed for a predetermined period of time to generate the maximum air volume in the cooling unit. Since air can be supplied, residual moisture within the cooling unit can be discharged to the outside of the cooling unit, which has a great practical effect of being able to eliminate the cause of abnormal odors.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing one embodiment of the invention, FIG. 2 is a control circuit diagram showing a different example of the invention, and FIG. 3 is a flowchart showing the operation of the same embodiment. 1...Fan motor drive circuit, 2...Main switch, 3...Fan motor, 4...Fan switch,
12... Compressor drive circuit, 13... Compressor, 14... Air conditioner switch, 16... Fan control circuit. Figure 3

Claims (1)

[Claims] (1) a fan motor drive circuit having a fan switch connected to a main switch to operate the fan motor;
In a structure including an air conditioner switch connected to the main switch and the fan switch, and a compressor drive circuit that operates the compressor by turning on the main switch, the fan switch, and the air conditioner switch, the fan motor drive circuit includes: An air conditioner for an automobile, comprising a fan control circuit that operates the fan motor at high rotation speed for a predetermined period of time and then stops the fan motor when the main switch is turned off while the air conditioner is in use with the air conditioner switch turned on.