A coolant control valve unit includes: a valve housing including a barrier rib where a coolant path and a fail-safe path are formed, the valve housing further including an exhaust path through which coolant exhausted through the coolant path passes; a valve disposed to open and close the coolant path; an actuator that opens or closes the coolant path by moving the valve; a flow guide extended from the barrier rib, of which an end is formed in a flow direction of the coolant in the exhaust path, and guiding a flow of coolant exhausted through the coolant path and a flow of coolant exhausted through the fail-safe path; and a fail-safe valve closing the fail-safe path by being inserted into the fail-safe path, while opening or closing the fail-safe path by a coolant temperature.

A regulator has a regulation unit (422, 622) with an adjustment unit (624), having a drive unit (414, 620) configured for adjusting the adjustment unit (624), and having a lockable and unlockable force store (412, 610-616). The regulation unit (422, 622) and the adjustment unit (624) are in contact with one another via the force store (412, 610-616), and the regulation unit (422, 622) can, in the case of a locked and charged force store (412, 610-616), be displaced by the adjustment unit (624) within an adjustment range (630) so as to drive the force store (412, 610-616). In the event of unlocking the charged force store (412, 610), a discharge of the force store (412, 610-616) causes the regulation unit (422, 622) to be moved automatically into a safety position independently of the adjustment unit (624).

Pump for recirculating a cooling fluid for a vehicle with combustion engine, comprising: a pump body (11) designed to be fixed to a base (11a) of the vehicle engine; an impeller (1) inserted inside a chamber containing the cooling fluid and mounted on a driven shaft (2), at least one first electric motor (50) for driving the shaft (2) of the impeller (1), whereinsaid electric motor (50) comprises a fixed stator (51) mounted on the body (11) of the pump on the outside thereof and a rotor (52) radially outer lying with respect to the stator and connected to the shaft (2) of the impeller (1) of the pump on the outside of the cooling fluid chamber and via transmission means (54, 54a; 354, 354a; 54a, 66), and wherein the electric motor is designed to operate the impeller independently of the combustion engine.

A method of controlling a cooling system includes, by an integrated controller: controller area network (CAN) checking whether CAN communication is abnormal after a vehicle is turned on and control of a cooling fan and an active air flap is initiated; single-communication checking whether communication with a cooling fan controller and an active air flap (AAF) controller is abnormal; performing a first fail-safe operation of communicating with the cooling fan controller and the AAF controller; and controlling the cooling fan and the active air flap based on signals of a first temperature sensor of the cooling fan controller and a second temperature sensor of the AAF controller.

A cooling device includes an inner passage, an outer passage, an engine-driven pump, an electromagnetic control valve, and a driving circuit that regulates current flowing through the electromagnetic control valve by activating and deactivating a switching element. A cooling controller for the cooling device includes a processing circuit configured to execute an operation process for operating, when the engine-driven pump is driven, the switching element by setting a duty cycle of an activation time to a switching cycle, which is a reciprocal of a switching frequency of the switching element, to be a larger value when a temperature of the internal combustion engine is low than when the temperature is high and a cycle varying process for setting a longer switching cycle when the temperature of the internal combustion engine is less than a preset temperature than when the temperature is greater than or equal to the preset temperature.

A valve device with fail-safe mechanism capable of improved production efficiency includes a valve element, a valve element housing, a third communication port provided in the valve element housing, and a fail-safe mechanism. The fail-safe mechanism includes a thermo-element and an element housing that houses the thermo-element. The element housing has a large-diameter housing, a small-diameter housing portion that accommodates the thermo-element, and a step. A valve element communicating portion communicating with the valve element housing is provided to the small-diameter housing portion. The fail-safe mechanism includes a valve plate member for closing the step and a coil spring that biases the valve plate member. A third adapter provided to the third communication port is provided with a through-hole that enables the large-diameter housing portion and the third communication port to communicate with each other.

A failure diagnosis method of a coolant temperature sensor for a vehicle, may include determining, by a controller, whether or not it is in a flow stop state that stagnates the flow of coolant by a flow control valve; obtaining, by the controller, an engine outlet coolant model temperature when it is in the flow stop state; and diagnosing, by the controller, as a failure of an engine outlet-side outlet water temperature sensor when the coolant model temperature is equal to or greater than a reference temperature and the flow stop state is maintained by the flow control valve.

A valve apparatus, in particular for a cooling system of a vehicle, includes a housing having at least two fluid connectors, a valve device which can be adjusted at least between a first valve position and a second valve position, and a drive for adjusting the valve device between the first valve position and the second valve position. The valve apparatus includes a fail-safe adjustment device in order to transfer the valve device from the first valve position into the second valve position in the event of an incident in which the power supply, in particular that of the vehicle, is interrupted.

There is provided a control valve including a cylindrical casing having an inlet port and a first outlet port for a fluid, and a valve accommodated in the casing to be rotatable around an axis extending in an axial direction of the casing and having a flow path communicating with the inlet port to allow the fluid to flow therethrough, wherein a first communication port communicating with the flow path and the first outlet port according to a rotational position of the valve is formed in the valve, and a fail opening configured to be opened and closed by a thermostat is formed in a portion of the casing facing the inlet port in an opening direction of the inlet port.

A grille shutter control device includes a control section and a diagnostic section. The control section is connected to a communication line in a vehicle and controls opening and closing of a grille shutter that introduces air to a cooling target of the vehicle. In a case in which a communications fault is detected, the control section controls to open the grille shutter. The diagnostic section is connected to the communication line and detects a degree of opening of the grille shutter by communicating with the control section. A temperature detection section detects a temperature of the cooling target. In a case in which the communications fault is detected, the diagnostic section diagnoses a malfunction of the grille shutter if a temperature detected by the temperature detection section is higher than a pre-specified threshold.