| 摘要 |
PURPOSE:To improve hot water flow rate regulation precision when a flow rate is low, by a method wherein a flow rate control pump, varying a delivery amount by means of a flow rate regulating valve and the number of revolutions, is situated in a hot water flow passage, and when the number of revolutions of a pump is below a specified value, a flow rate is controlled by means of the opening of a regulating valve. CONSTITUTION:A control circuit 32 performs computing processing by means of an external air temperature 22, an internal air temperature 27, a quantity of solar radiation 28, a set temperature 30, a temperature 23 at the rear of a vaporizer, a water temperature 26, and position information 24 of an actuator 16, and controls an air conditioning control means. In this case, the target stroke amount and the auxiliary target stroke amount of an actuator 16, located in a passage running to a heater core 8, are decided the applied voltage of a water pump 15 is controlled, and a flow rate of hot water is controlled. When the number of revolutions of the water pump 15 is reduced to a lowermost value, a flow rate is controlled through control of an opening by means of the actuator 16. This constitution enables a flow rate during low flow rate operation to be accurately regulated. |
