JPS6033121A - Control of wind amount of air conditioner for car - Google Patents

Abstract

PURPOSE:To improve feeling by reducing the wind amount by stopping a blower motor or reducing the applied voltage when the engine cooling water temp. is below a set temp., and gradually varying the applied voltage when the cooling water temp. is over the set temp., and obtaining the aimed wind-amount. CONSTITUTION:When the movable contact piece 8e of a wind-amount switch 8 is connected to a fixed contact 8a and automatic operation is performed, a control part 3 compares the engine cooling water temp. 7 with a set temp., and when the cooling water temp. is lower than the set temp., the voltage applied onto a blower motor is set constant, and when the cooling water temp. rises over the set temp., the voltage applied onto the blower motor is increased by a certain value, and it is judged that the aimed value is reached or not, and when the aimed value is not reached, the voltage applied onto the blower motor is increased again by a certain amount after the lapse of a certain time. Through the repetition of the above-described operation, the wind amount is controlled to the aimed value. Thus, the feeling due to the variation of the wind amount can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air volume control method in an automobile air conditioner.

Conventional configuration and its problems Conventionally, this type of air volume control device has been used for heating, especially in winter.
Until the temperature of the engine coolant rises, it will be very cold due to the cold strong wind being blown out.When the temperature of the engine coolant is low, the air volume inside the passenger compartment should be reduced to zero or reduced. I was trying to adjust the amount of air. Here, the target air volume is determined by the set temperature, the vehicle interior temperature, etc., and if the difference between the set temperature and the vehicle interior temperature is large, the air volume is set to be large.

However, with this type of control, there is a problem in that when the engine cooling water level reaches a certain level and the airflow reaches the target airflow, the airflow suddenly changes and the feeling becomes significantly worse.

Furthermore, the set temperature of the engine cooling water that switches the air volume to the target value is generally around 50 degrees Celsius, so no matter how much you increase the air volume in this state, the heating capacity will not increase and there will be problems such as increased noise. there were. Increasing the set temperature of the cooling water is disadvantageous in that it increases the vehicle interior temperature in a short period of time.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to improve the feeling by changing the air volume during winter heating without making you feel cold due to cold air.

Structure of the Invention In order to achieve this object, the present invention detects the temperature of engine cooling water and reduces the air volume when the temperature is below a set value, and gradually reduces the air volume when the temperature exceeds the set value. It is something that is meant to change.

DESCRIPTION OF EMBODIMENTS The present invention will now be described with reference to the accompanying drawings showing one embodiment thereof.

In FIG. 1, reference numeral 1 denotes a positive voltage supply section, which is connected to the collector of the power transistor 2 and the control section 3. The power transistor 2 has a base connected to the control section 3, an emitter connected to the blower motor 4, and the other end of the blower motor 4 connected to the ground 5. Blower motor 4
A back electromotive voltage protection diode 6 is connected in parallel with the . The control unit 3 also includes a radiator cooling water temperature detection sensor 7 and a fixed contact point of the air volume changeover switch 8.
A to terminal 8a, manual terminals sb, sc, 6d, and ground 5 are connected to each other. A movable contact piece 8e of the air volume changeover switch 8 is connected to the ground 5.

In the above configuration, when the air volume selector switch 8 is in the manual state, that is, when the movable contact piece 8e is connected to the fixed contact 8b, 8C1, or sdK, the control unit 3. The blower motor 4 is powered by the power transistor 2.
is operated manually. Set the air volume selector switch 8 to A u
When set to to, that is, when the movable contact piece 8e and the fixed contact 8a are connected, the blower motor 4 is automatically controlled based on the engine cooling water temperature 7.

This content will be explained with reference to FIG. 2 which shows a flowchart. First, the air volume changeover switch 8 detects whether it is in the AUTO state or the MANUAL state, and if it is in the AUTO state, the blower motor 4 is put into manual operation.

If so, it is detected whether the engine coolant temperature is less than the set value. When the engine cooling water temperature is less than the set value, the voltage applied to the blower motor is kept constant at the set value, and when the temperature exceeds the set value, the voltage applied to the blower motor is increased by a certain value to determine whether it is at the target value. If not, after a certain period of time has elapsed, the voltage applied to the blower motor is increased by a certain value again, and the process is repeated. Once the target air volume is reached, it is stabilized there.

In this way, in this embodiment, depending on the engine cooling water temperature,
The automatically controlled blower motor for air conditioning inside the vehicle does not change suddenly, providing a better feeling and significantly reducing noise.

Effects of the Invention As is clear from the above embodiments, the method for controlling the air volume of an automobile air conditioner according to the present invention detects the temperature of the engine cooling water, and when the temperature of the engine cooling water is below a set value,
Either stop the blower motor or reduce the applied voltage to lower the air volume, and when the temperature exceeds the set temperature, gradually change the applied voltage to the blower motor to achieve the target air volume without sudden changes in air volume. It has various advantages such as improved feeling, reduced noise, and can be realized at low cost.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram of a main part of an air volume control device for an automobile air conditioner according to an embodiment of the present invention, and FIG. 2 is a flowchart for controlling the air volume. 3...Control unit, 4...Blower motor, 7...
...Engine coolant temperature detection sensor, 8...
・Air volume selector switch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] It has an air volume control device that detects the temperature of the engine coolant and automatically controls the pro-ar motor for air conditioning in the vehicle interior. In this automotive air conditioner, the air volume is lowered by stopping the motor or reducing the applied voltage, and when the temperature exceeds the set temperature, the applied voltage of the pro-ar motor is gradually changed to reach the target air volume. How to control the air volume of the machine.