A controller of a fan coupling device includes: an acquisition unit that acquires an acceleration parameter and a deviation parameter; a control unit that controls a regulation mechanism; a prediction unit that predicts that hunting occurs in the rotation speed of the fan, when an operating point of the fan expressed with the deviation parameter and the acceleration parameter belongs to a predicted region; and a restraining unit that executes, when the hunting is predicted to occur, a hunting restraining process of executing at least one of lowering an integral gain of a feedback control to be lower than when the hunting is not predicted to occur and increasing a derivative gain of the feedback control to be higher than when the hunting is not predicted to occur.

The cooling capacity of a cooling fan is made lower when a vehicle was not running while towing a trailer than when the vehicle was running while towing the trailer immediately before the end of a service of the vehicle, in activating the cooling fan after the end of the service.

A warm-up method based on a temperature control module, a vehicle, and a storage medium. The warm-up method based on the temperature control module comprises: entering a cold start mode; obtaining current temperature control parameters, the temperature control parameters comprising a current water temperature value, a current engine speed, and a current engine load; obtaining working parameters of a temperature control module according to the temperature control parameters; controlling the temperature control module according to the working parameters to adjust the water temperature to warm an engine, and updating the current water temperature value; and after the updated current water temperature value does not exceed a warm-up threshold, returning to the step of obtaining the current temperature control parameters to enter the next cycle.

A method of diagnosing a PCJ solenoid valve includes determining whether a predetermined diagnostic condition is satisfied; performing diagnostic spraying by controlling the PCJ solenoid valve to cause the PCJ to spray oil for a predetermined diagnostic spraying time when the controller concludes that the predetermined diagnostic condition is satisfied; and diagnosing a failure of the PCJ solenoid valve by use of changes of oil pressure introduced to the PCJ or of PWM duty that controls an oil pump configured for pumping oil supplied to the PCJ after the diagnostic spraying from the PCJ.

An engine cooling control apparatus, a system including the same, and a method thereof provide an engine cooling control apparatus including a processor configured to calculate a required fan rotation speed for controlling a cooling fan based on proportional integral (PI) control and a storage configured to store data acquired by the processor and an algorithm for driving the processor. The processor classifies a plurality of control regions depending on a coolant temperature and adjusts and outputs the required fan rotation speed for each of the control regions.

A controller includes: a control unit configured to calculate a control command value of an opening degree of a solenoid valve to control an opening degree of the solenoid valve; and an acquisition unit configured to acquire an estimated amount and a target amount of a working fluid in a labyrinth chamber, and a rotation speed of a drive shaft. The control unit calculates a final control command value based on a feedback control command value and a feedforward control command value, and controls the solenoid valve, the feedback control command value being calculated based on deviation between the estimated amount and the target amount, the feedforward control command value being used to maintain a rotation speed of a fan constant based on the estimated amount and the rotation speed of the drive shaft.

An engine coolant system includes a variable-opening valve having a plurality of tubes in fluid flow communication with an engine block and a radiator. The coolant system also includes an electrically-powered pump arranged to cycle coolant through the radiator and the engine block to regulate an engine temperature. The coolant system further includes a controller programmed to store a baseline relationship between pump speed and pump power draw using a nonlinear scale. The controller is also programmed to detect a steady state operating condition of the pump, and identify an operational relationship between real-time pump speed and a pump power draw. The controller is further programmed to detect a coolant leak based on a deviation between the baseline relationship and the operational relationship.

A fluid flow control device controls flow of coolant in a motor vehicle motor cooling system. The flow control device includes first and second coolant inlets and first and second coolant outlets. The flow control device is operable selectively to direct coolant flowing into the device to flow out from the flow device through one or both of the first and second outlets in dependence on a temperature of fluid flowing through the device.

The present disclosure provides an engine cooling system having a coolant temperature sensor to sense the temperature of coolant discharged from an engine; a radiator radiating heat while part of the coolant discharged from the engine is passed through the radiator; a coolant control valve unit to control coolant passing through the radiator and coolant supplied from the engine; and a control unit configured to control the temperature of coolant by controlling the coolant control valve unit according to the coolant temperature sensed by the coolant temperature sensor, wherein the control unit calculates a coolant temperature at an entrance of the engine using the sensed coolant temperature and a heat rejection rate of the engine based on the operation condition, calculates a temperature of coolant discharged from the radiator, and controls the opening degree of the coolant control valve unit using the coolant temperatures.

A working machine includes a machine body, an engine provided on the machine body, a radiator to cool a coolant supplied to the engine, a first fan provided on one directional surface side of the radiator, the first fan being rotatable in either one of a first direction to suck external air to an interior of the machine body and a second direction to generate an air flow for discharging air from the interior of the machine body to an exterior of the machine body, and a second fan provided on the other directional surface side of the radiator and configured to be rotated in the second direction.