Vehicle control device
The present disclosure provides a vehicle control device including: a fluid circuit, mutually connecting an engine, a vehicle cabin interior heat exchanger for discharging heat into a vehicle cabin interior, and a heat discharging heat exchanger included in a refrigerant cycle in which a refrigerant is compressed and expanded by a compressor, and in which a fluid circulates; and a control unit for controlling the compressor and the engine such that, in a case in which engine warm-up operation ending conditions have not been established and in a case in which predetermined stopping conditions, other than the warm-up operation ending conditions, for stopping engine idling have been established, the compressor is operated while the engine is idling so as to release heat from the refrigerant from the heat discharging heat exchanger and to heat the fluid.
1. A vehicle control device comprising:
a fluid circuit, mutually connecting an engine, a vehicle cabin interior heat exchanger for discharging heat into a vehicle cabin interior, and a heat discharging heat exchanger included in a refrigerant cycle in which a refrigerant is compressed and expanded by a compressor, and in which a fluid circulates; and
a control unit for controlling the compressor and the engine such that:
when predetermined idling stop conditions are established, an idling of the engine is stopped, the predetermined idling stop conditions including (i) engine warm-up operation ending conditions and (ii) other conditions, wherein
(i) the engine warm-up operation ending conditions are established in a case in which a temperature of the fluid as measured by an engine water temperature sensor is equal to or higher than a predetermined engine-mechanical-loss-reduction-required-temperature at which mechanical loss in the engine can be reduced, wherein the predetermined engine-mechanical-loss-reduction-required-temperature is lower than a heater-required temperature at which the fluid can function as a heat source to heat the vehicle cabin interior, and
(ii) the other conditions are established in a case in which a vehicle has stopped; and
when the engine warm-up operation ending conditions are not established while the other conditions are established by the vehicle having stopped, the compressor is operated and the engine is maintained idling so as to release heat from the refrigerant from the heat discharging heat exchanger and to heat the fluid, wherein
in a case in which the engine warm-up operation ending conditions are established and the engine is to be stopped, the control unit estimates, from the temperature of the fluid and from an external air temperature, a heat discharge amount of the fluid and a heating amount of the fluid received from the heat discharging heat exchanger, and
based on the estimation, the control unit continuously operates the engine in a case in which the heat discharge amount is greater than the heating amount, and effects control so as to stop the engine in a case in which the heating amount is greater than the heat discharge amount.
2. The vehicle control device according to claim 1 , wherein
in a case in which the engine warm-up operation ending conditions are established, the control unit effects control so as to:
(i) stop the engine in a case in which the other conditions are established;
(ii) continuously operate the engine in a case in which the other conditions are not established; and
(iii) continuously operate the compressor so as to keep the temperature of the fluid at a preset temperature.