A coolant control system for a vehicle, including: a coolant control valve including a radiator valve; an actuator connected to the coolant control valve; and a control unit. Upon shutdown of the vehicle: the control unit is arranged to generate a control signal based upon a prediction of an ambient temperature and transmit the control signal to the actuator; and the actuator is arranged to receive the control signal and rotate a portion of the radiator valve according to the control signal.

An air conditioner for a vehicle including an engine, which serves as a power source and is configured to allow a cooling water to flow therethrough, includes a cooling water circuit, a heater, temperature sensors, and an output controller. The cooling water circuit allows the cooling water to circulate therein in a heating operation. The heater serves as a heat source, other than the engine, configured to heat the cooling water circulating in the cooling water circuit. The temperature sensors are connectable to the cooling water circuit and are configured to detect a temperature of the cooling water. The temperature sensors are positioned upstream and downstream of at least one of the engine and the heater. The output controller is configured to adjust at least an output of the heater based on the temperatures of the cooling water detected by the temperature sensors.

An example system includes an engine and an exhaust passage fluidly coupled to the engine. A waste heat recovery system includes a boiler operatively coupled to the exhaust passage, and a condenser fluidly coupled to the boiler. An integrated cooling system includes an engine cooling circuit, a waste heat recovery cooling circuit, a waste heat recovery bypass valve, and a controller. The waste heat recovery bypass valve is operatively coupled to the exhaust passage upstream of the boiler, and is selectively controllable so as to direct at least a portion of the exhaust gas through an exhaust bypass passage so as to bypass the boiler. The controller is in operative communication with the waste heat recovery bypass valve. The controller is structured to determine a cooling demand of the engine, and to control a valve position of the waste heat recovery bypass valve based on the cooling demand.

Upon a valve rotation angle of a flow rate control valve exceeding a radiator-flow-path closed position during changing of the valve rotation angle of the flow rate control valve in an opening direction of a radiator flow path from a closed state of the radiator flow path, a cooling water starts to circulate through the radiator flow path, and an outlet water temperature or an inlet water temperature of an engine starts to drop. The radiator-flow-path closed position is learned as a valve rotation angle of the flow rate control valve immediately before the outlet water temperature or the inlet water temperature starts to drop during changing of the valve rotation angle of the flow rate control valve in the opening direction of the radiator flow path from the closed state of the radiator flow path.

A control system that uses an algorithm to control the fan speed in a cooling system for an engine is disclosed. The algorithm is adapted to maintain a cooling medium at a set temperature instead of an operating temperature range of the cooling medium. The algorithm is also adapted to maintain a cooling medium at a set temperature and to build a cooling safety margin in response to an engine output torque percentage that is below an output torque percentage setpoint.

A method for thermostat failure detection in an engine cooling system is provided. The engine cooling system includes a coolant pump and a thermostat for providing a coolant flow between an engine and a radiator. The method includes determining one or more engine parameters. Further, a pressure difference between a coolant pump inlet pressure and a coolant pump outlet pressure is determined corresponding to the one or more engine parameters. The thermostat failure is detected when the determined pressure difference is outside a predefined range of pressure change defined corresponding to the determined one or more engine parameters.

The cooling device according to the present invention includes an electric water pump for circulating cooling water through an internal combustion engine of a vehicle, and controls the discharge flow rate of the electric water pump as follows. Until the cooling water temperature. TW reaches a warm-up completion determination temperature, the cooling device increases the discharge flow rate along with an increase of the cooling water temperature TW. After the cooling water temperature TW reaches the warm-up completion determination temperature, the cooling device controls the discharge flow rate so as to bring the combustion chamber wall temperature TCYL toward a target temperature. Thereby, the cooling device can warm up the internal combustion engine more efficiently, and improve the combustion performance of the internal combustion engine after the completion of warm-up.

A system for regulating a flow of liquid coolant in an automotive cooling system includes a valve body having an inlet and an outlet. A pressure operated valve member moves in response to a fluid pressure. An electrically operated valve member regulates the fluid pressure within the chamber. A sensor target is coupled to the pressure operated valve member. A position sensor is located outside of the valve body and outputs a position signal based on proximity of the sensor target. An electronic control unit calculates a target coolant flow rate based in part on a calculated target temperature for the engine and a temperature signal from a temperature sensor, determines a target position for the pressure operated valve member based on the target coolant flow rate, and controls operation of the electrically operated valve member based on the target position and the position signal.

A liquid cooling circuit includes a liquid reservoir for coolant, a heat-generating module, a conduit fluidly coupling the heat-generating module with the liquid reservoir, and a pump configured to move the coolant through the conduit to cool the heat-generating module. The liquid cooling circuit is configured such that the movement of the coolant relative to the heat-generating module transfers heat from the heat-generating module to the coolant.

A cooling system circulates a cooling medium between an engine and a radiator. The cooling system includes a determination unit. The determination unit sets a relatively small predetermined value for a threshold when a thermostat is closed, and sets a predetermined value larger than the predetermined value for the threshold when the thermostat is open. The determination unit determines that there is a stuck-closed failure in a selector valve when a temperature difference between a coolant temperature from a first coolant temperature sensor and a coolant temperature from a second coolant temperature sensor is larger than or equal to the threshold.