In an internal combustion engine, a thermostat valve for changing over between coolant circulation through a radiator-routing passage to coolant circulation through a bypass passage, is provided with a first valve for opening and closing the radiator-routing passage, and a second valve for opening and closing the bypass passage. The first and second valves and are operable concurrently. A cylinder coolant jacket around cylinder bores of a cylinder portion is partitioned into two in a cylinder axis direction to thereby form a main cylinder coolant jacket on a side of a cylinder head portion and a sub-cylinder coolant jacket on a side of a crankcase portion. The bypass passage is formed partly by the sub-cylinder coolant jacket. The above arrangement expedites warming-up during the engine start and achieves favorable appearance by a simplified structure.

An engine cooling device includes a first supply pump driven by an engine, a second supply pump driven by an electric motor, a first fluid path switching valve, a temperature detector, a revolution speed detector that detects the revolution speed of the engine, and a controller that controls the actuation of the electric motor and the fluid path switching valve. When the temperature of the engine detected by the temperature detector (engine cooling water temperature) is less than a first predetermined temperature, the controller performs control to restrict the supply of the cooling fluid from the first supply pump to the engine by switching the fluid path switching valve to a restricted state, and to supply the cooling fluid from the second supply pump to the engine by performing control to drive the electric motor.

An internal combustion engine, especially a diesel internal combustion engine, having at least one intercooler, at least one control unit, at least a first and a second cooling circuit, whereby the cooler of the first cooling circuit is flow-connected to a cooling circuit of the internal combustion engine, while the cooler of the second cooling circuit of the internal combustion engine is flow-connected to the intercooler.

A pump assembly is fluidly coupled to a vehicle engine for moving a fluid. The pump assembly includes a pump housing and an impeller disposed in the pump housing for moving the fluid in the pump housing towards an outlet. Additionally, the pump assembly includes a valve assembly integrated with the pump housing. The valve assembly includes a barrel disposed in the pump housing and having at least one inlet, wherein the at least one inlet is configured to provide controlled flow of the fluid into the pump housing. A sleeve is rotatably coupled to the barrel for selectively controlling the flow of the fluid into the at least one inlet of the barrel. Additionally, the valve assembly includes an actuator assembly operably coupled to the sleeve and configured to rotate the sleeve between a first position and a second position.

A cooling system includes a cooling loop containing a cooling fluid configured for circulation through an engine, an auxiliary alternator configured to be driven by the engine for powering auxiliary loads of the rail vehicle, and a canned pump positioned within the cooling loop and being configured to circulate the cooling fluid through the cooling loop. The canned pump includes an integrated induction motor for driving the pump. The system further includes an electronic control system electrically connected to the auxiliary alternator and configured to electrically power the induction motor of the canned pump independently of a mechanical output of the engine.

An engine cooling system including a refrigerant circulation flow channel passing through an engine, an electric refrigerant pump, an electromagnetic valve arranged in the refrigerant circulation flow channel, and a control unit. In the engine cooling system, when the electric refrigerant pump is stopped and the voltage application to the electromagnetic valve is shut off when the electromagnetic valve is closed and the electric refrigerant pump is in operation, the voltage application to the electromagnetic valve is shut off when a first predetermined time period has passed after the electric refrigerant pump is stopped. When the engine is intermittently stopped during warming up of the engine, current application to the electromagnetic valve is shut off while the closed state of the electromagnetic valve is maintained.

An internal combustion engine having: an engine provided with a crankshaft; a cooling system provided with a circulation pump, which comprises an impeller supported by a pump shaft that is mounted so as to rotate around a rotation axis; an auxiliary shaft, which transmits the rotation movement to the pump shaft of the circulation pump; a mechanical transmission, which transmits the rotational movement from the crankshaft to the auxiliary shaft; and a coupling device, which is interposed between the pump shaft of the circulation pump and the auxiliary shaft and is suited to mechanically connect/disconnect the pump shaft to/from the auxiliary shaft.

A vehicle includes: an engine including cylinder, a piston, a crankshaft unit, a balancing shaft unit, and an engine cooling passage; a power generating system including a generator and a generator cooling passage; and a cooling system that includes a mechanical water pump driven by the crankshaft unit, a first heat exchanger in fluid communication with the mechanical water pump and the engine cooling passage to constitute a first cooling circuit, an electrically controlled water pump, a second heat exchanger in fluid communication with the electrically controlled water pump and the generator cooling passage to constitute a second cooling circuit, and a controlling unit for controlling operation of the electrically controlled water pump.

The invention relates to a coolant circuit (1) for an internal combustion engine (2), wherein the coolant can circulate between the internal combustion engine (2) and a heat sink (3) depending upon a switchable valve (4), which is closed in the initial state during a cold start of the internal combustion engine (2), wherein the valve (4) can be switched to an at least partially opened sequential state depending on an exhaust gas mass flow emitted by the internal combustion engine (2), and wherein a control device (6) determines an integral of the exhaust gas mass flow with respect to the time and switches the valve (4) into the sequential state when an integral threshold value is exceeded.

A system for cooling a vehicle selective catalytic reduction (SCR) may include an electronic control clutch water pump configured to circulate coolant to cool a vehicle engine, a controller configured to perform ON/OFF control of the electronic control clutch water pump when cooling of the SCR system is required in addition to the engine cooling, and a coolant circulation pathway provided in the SCR system so that the coolant associated with operation of the electronic control water pump or the electronic control clutch water pump circulates.