JPS6255217A - Air temperature control device for vehicle passenger's compartment - Google Patents

Abstract

PURPOSE:To enhance the stability and efficiency of supply of hot air, by providing such an arrangement that the heat quantity of a heat-exchanger is obtained in accordance with signals from an engine cooling water flow adjusting valve, a water temperature sensor and an engine rotational speed sensor, and the flow rate of cooling air is controlled in accordance with the thus obtained heat quantity. CONSTITUTION:A control circuit calculates the flow rate of engine cooling water passing through a heat-exchanger 6 in accordance with signals from an engine rotational speed sensor 2 and the opening degree of an engine cooling water control valve 5, and also calculates the heat quantity of the heat-exchanger in accordance with the thus obtained flow rate and a signal from an engine cooling water temperature 4. Meanwhile, a necessary heat-exchanging amount is determined in accordance with a desired blow-off air temperature, the drive voltage of a blower motor 8 and the blow-in air temperature 7 of the heat-exchanger. Further, with the result of comparison between the necessary heat exchanging amount and the heat quantity of the heat- exchanger, the opening degree of the engine cooling water control valve 5 is controlled. With this arrangement it is possible to stabilize the supply of hot air and to enhance the efficiency thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to controlling the flow rate of engine cooling water flowing through a heater in an automotive air conditioner.

[Conventional technology and its problems]

Regarding the flow rate control of engine cooling water in automotive heating systems,
In JP-A No. 59-145617, a variable flow rate pump is provided to control the flow rate at a constant or variable rate, and a blowout air temperature sensor is separately provided to keep the hot air blowing constant. need. In addition, in Special Publication No. 59-41404, the temperature of overflow wind was detected,
Together with the internal air sensor signal, the engine coolant flow rate control valve is controlled. Therefore, there are problems such as the flow rate changing depending on the engine speed and not being constant.

[Means for solving problems]

Therefore, the present invention controls the flow rate and heat exchange amount of engine cooling water flowing through heat exchange air using a water temperature sensor, a flow rate control valve, and an engine rotation speed signal, without requiring a variable flow rate electric pump or the like. The purpose of the present invention is to provide an air temperature control device for a vehicle passenger compartment that can supply hot air stably and efficiently.

〔Example〕

In FIG. 1 showing the first embodiment, the control circuit 3 includes a rotation speed sensor 2 of the engine 1, a temperature sensor 4 that detects the temperature of the engine cooling water, and a temperature sensor that detects the temperature of the upstream side of the heat exchange air 6. 7. From signals such as the driving voltage of the blower motor 8, the target blowing temperature, optimum blower air volume, and engine cooling water flow rate are determined, and a driving signal for controlling the valve opening of the flow rate control valve 5 is determined.

FIG. 2 shows a block diagram of flow rate control valve opening control in the control circuit 3.

The control circuit 3 first determines the flow rate of engine cooling water passing through the heat exchange air from each signal of the engine rotation speed and the flow control valve opening degree. The heat exchanger heat amount is calculated from this and the engine cooling water temperature. Further, the required heat exchange amount is determined from each signal of the target blowout temperature, the heat exchanger passing air volume determined by the blower motor drive voltage, and the heat exchanger suction air temperature. Then, the opening degree of the flow rate control valve 5 is controlled according to the calculation result of the difference between the required heat exchange amount and the heat exchanger heat amount.

In the second embodiment of the present invention shown in FIG. 3, 10 is a temperature sensor that detects the air temperature downstream of the heat exchanger. FIG. 4 shows a flow rate control valve opening degree control block diagram of the embodiment shown in FIG. 3.

In this embodiment, the opening degree of the flow rate control valve 5 is controlled based on the signal from the heat exchanger downstream air temperature sensor 10 and the calculated heat exchanger heat amount. Note that the temperature sensor 10 may be an outlet temperature sensor.

〔Effect of the invention〕

As described above, the present invention provides an engine cooling water flow rate introduced into a heat exchanger based on the engine rotation speed and the adjustment valve adjustment amount,
Since the heat exchanger heat amount is determined based on the temperature, the heat exchange heat amount can be accurately controlled using a simple detection means.

[Brief explanation of drawings]

1 and 2 are a block diagram and a control block diagram showing a first embodiment of the present invention, and FIGS. 3 and 4 are a block diagram and a control block diagram showing a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Engine, 2... Rotation speed sensor, 3... Control circuit, 4... Cooling water temperature sensor, 5... Flow rate control valve, 6... Heat exchanger, 8... blower motor.

Claims (1)

[Claims] A heat exchanger into which cooling water for the engine is cyclically introduced by the engine as the vehicle engine operates, and air for heat exchange is introduced into the heat exchanger and the heat is exchanged. a blower device that blows air into a vehicle cabin; a regulating valve that regulates the amount of cooling water introduced from the engine to the heat exchanger; a means for responding to the actual amount of adjustment of the regulating valve; means for responding to the rotation speed of the cooling water; means for responding to the temperature of the cooling water; means for determining heat exchanger heat quantity from the adjustment amount, rotation speed, and temperature; An air temperature control device for a vehicle passenger compartment, comprising: means for determining an adjustment amount of;