JPS6264611A - Control device for on-vehicle air conditioner - Google Patents

Abstract

PURPOSE:To prevent cool wind due to ram pressure from coming in by actuating an auxiliary heating device attached to a ventilating device with an electric fan suspended when a heater is found to be short of the heating capacity in an on-vehicle air conditioner. CONSTITUTION:A heater 10 heats air up by circulating engine cooling water. When the temperature of cooling water is below a specified one, a temperature switch 60 is opened, but a main relay switch 40 is not energized. That is, if the heater is found to be short of the heating capacity, a fan 11 stops. Meanwhile, a subrelay 90 is energized when a main relay 40 is energized, as a circuit is built up so that a contact is closed by a relay 100 when a fan switch 30 is in an auto-positon, an electric heater 19, if the fan switch 30 is in the auto- positon, is energized and heated up when the fan stops because of short of the heating capacity on the part of the heater. This configuration is capable of preventing cool wind due to ram pressure from coming into a cabin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a car air conditioner control device equipped with at least a heater.

[Conventional technology]

In a car air conditioner equipped with a heater, when a desired heating effect is expected, but the heating effect is not achieved due to low engine cooling water temperature, the electric blower and ventilation device blow cold air toward the passenger compartment. In order to deal with such problems, car air conditioner control devices that mainly have an automatic air volume controller are configured to detect conditions in which the desired heating effect is not achieved and stop the electric blower. Things are known.

[Problem that the invention seeks to solve]

Generally, car air conditioners are configured to take in outside air. Therefore, even if the electric blower is stopped, the ram pressure will cause airflow in the ventilation device while the vehicle is running. If this phenomenon occurs while the aforementioned electric blower is stopped, cold air will still be sent to the cabin. If you use your car air conditioner to take in air,
Although these problems can be alleviated to some extent, problems such as increased cabin air temperature and fogging of window glass occur.

[Means for solving problems]

In order to solve these problems, the present invention includes: an auxiliary air heater that is installed in the ventilation device and generates heat when power is supplied to assist the heating of the heater; a detection means for detecting a condition in which the heating effect is not exerted; and an electric circuit that cuts off power supply to the electric blower and supplies power to the auxiliary air heater according to the detection result. Features.

[Effect]

According to the present invention having such structural features, when the desired heating effect is not exerted, the electric blower is stopped and the electric auxiliary air heater is made to generate heat.

Therefore, in the outside air intake state, by heating the air generated by the ram pressure with the auxiliary air heating device, it is possible to prevent cold air from being sent into the passenger compartment. The air flow produced at the ram pressure is generally small and the amount of electricity consumed in the auxiliary air heater is negligible.

〔Example〕

In FIGS. 1 and 2 showing the first embodiment, a heater 10 exerts a heating effect by cyclically introducing engine cooling water. The heater 1o is provided in the ventilation device 12 together with the electric blower 11. The figure shows a car air conditioner that mixes cold and hot air, and includes an evaporator 15, an air mix door 16, an inside/outside air introduction switching door 17, and an outlet switching door 18. An electric heater 19 is arranged in series with the heater 1o to perform supplementary air heating.

Referring to FIG. 1 regarding the electric circuit, the electric blower 11
is ignition switch 2o and blower switch 30
When the main relay 40 is energized, its relay contacts are supplied with power from the battery via the circuit breakers C and B. Electric blower 1
The air blowing capacity of No. 1 can be selected in stages by selecting the resistance R using the air blowing switch 3o or the program switch 50. The program switch 50, in which the air mix damper 16 and the movable contact 51 are interlocked, is activated when the manually operated contact of the air blower snap 3o is in the automatic (AUTO) position.

In this automatic position, the energizing circuit of main relay 4° is established when temperature switch 6o or mode switch 70 is closed. The temperature switch 60 opens when the engine coolant temperature is below 30"C, and closes when the temperature exceeds 30"C.The mode switch 70 is connected to the air outlet switching door 1.
It is opened when 8 is in the heater blowing position, and closed when it is in another position. Therefore, when the blower switch 3o is in the automatic position, in the heater blowing mode, and the heating action of the heater 1o is not desired, the main relay 40 is not energized and the electric blower 11 is stopped.

Further, the program switch 5o causes the relay 52 to close the contact when the blowout mode switch 71 is closed (the blowout mode is other than the heater blowout mode) or the cooling water temperature switch 8o is closed (for example, detects a temperature of 50° C. or higher). , exhibits the selective effect of resistance R.

An electric circuit is connected to the electric heater 19 so that it is energized when the blower switch 3o is in the automatic position and the electric blower 11 is stopped.

The sub-relay 90 is interlocked with the main relay 40, and is energized when the main relay 40 is energized to open a normally closed contact. One more
The two relays 1oo are energized to close their contacts when the blower switch 30 is in the automatic position. For this reason, electric heater 1
9, when the blower switch 30 is in the automatic position and the engine coolant temperature is low enough to stop the electric blower 11, the contacts of the sub-relay 90 close and the contacts of the relay 100 also close;
The electric heater 19 is energized to generate heat.

In FIG. 3 showing the second embodiment, the sub-relay 90 is
It is connected to a connection point between the mode switch 71 and the cooling water temperature switch 80, so that the electric heater 19 is energized and generates heat even when the electric blower 11 starts blowing air and is at its minimum blowing capacity.

In FIG. 4 showing the third embodiment, the electric heater 19 is configured to be stopped when the traveling speed of the vehicle produces a ram pressure air amount below a predetermined value. For this purpose, the vehicle speed pulse generator 110 and the duplex determination circuit 1fl are connected to a circuit that energizes the relay 100.

[Brief explanation of drawings]

Fig. 1 is an electrical wiring diagram of the first embodiment of the present invention, Fig. 2 is an explanatory diagram of an example of the arrangement of an electric blower and an electric heater, and Figs. 3 and 4 are electrical wiring diagrams of the 2.3 embodiment, respectively. It is a diagram. 10... Heater, 11... Electric blower, 12...
Ventilation device, 19...Electric heater (auxiliary air heater)
. 30...Blower switch, 40...Main relay, 6
o. 80...Cooling water temperature switch, 70...Blowout mode switch, 90...Sub relay, 100...Relay.

Claims (1)

[Scope of Claims] A heater using engine cooling water as a heat source, and a ventilation device having at least one end open to the outside air and the other end open to the passenger compartment in order to generate an air flow toward the vehicle passenger compartment through the heater. and a car air conditioner control device equipped with an electric blower, comprising: an auxiliary air heater that is provided in the ventilation device and generates heat when power is supplied to assist the heating of the heater; A car air conditioner comprising: a detection means for detecting a condition in which a heating effect is not exerted; and an electric circuit that cuts off power supply to the electric blower and supplies power to the auxiliary air heater according to the detection result. Control device.