REFRIGERANT CIRCULATION SYSTEM

摘要

In order to shift a rotation angle of a rotor to a region of a normal mode (for example, a region c) from a region of a heater cut mode (for example, a region e), the rotation angle needs to pass through a region where a flow rate of a refrigerant which is caused to flow through all branch channels becomes zero (a region d). When the refrigerant has a high temperature, there is a possibility of the refrigerant being not cooled, and boiling. Therefore, when a request to switch a normal mode and a heater cut mode is issued, permission/non-permission of switch of the mode is determined by comparison of a temperature of the refrigerant detected by the temperature sensor 26 and an upper limit temperature of the refrigerant.

主权项

1. A refrigerant circulation system, comprising:
a first refrigerant circuit for returning a refrigerant that passes through a main body of an internal combustion engine to the main body after causing the refrigerant to perform heat exchange with a first heat exchanger; a control valve that is provided in the first refrigerant circuit, and includes a rotor that rotates around a rotation axis; a second refrigerant circuit that is connected to the control valve, and is for returning the refrigerant which passes through the main body to the main body after causing the refrigerant to perform heat exchange with a second heat exchanger; and a controller programmed to control a rotational operation of the rotor, based on an operation plan that is set by relating opening and closing states of the first refrigerant circuit and the second refrigerant circuit with a rotation angle of the rotor from a reference position, wherein the operation plan comprises an all passing mode that changes both channels of the first refrigerant circuit and the second refrigerant circuit from a state in which both the channels of the first refrigerant circuit and the second refrigerant circuit are closed to a state in which both the channels are opened, and a partial cutoff mode that changes both the channels from the state in which both the channels are closed to a state in which only the first refrigerant circuit is opened, and the controller is programmed to prohibit rotation of the rotor following a mode switch request, when a temperature of the refrigerant which passes through the main body is higher than an upper limit temperature of the refrigerant which is determined based on an operating state of the internal combustion engine, in a case where the mode switch request to switch the all passing mode and the partial cutoff mode is issued.