A cooling device includes: an air blast passage; a heater core that is disposed in the air blast passage; an air blast volume adjusting member that is opened and closed to adjust an air blast volume which flows in the heater core; a flow rate adjuster that adjusts a flow rate of the coolant which is introduced into the heater core; and a controller. The controller sets the flow rate of the coolant which is adjusted by the flow rate adjuster to be less than a lower limit value of an adjustable range of the flow rate of the coolant which is adjusted by the flow rate adjuster in a vehicle compartment air-conditioning state in which the air blast volume adjusting member allows an air blast to flow to the heater core when the air blast volume adjusting member fully closes the heater core side of the air blast passage.

A method for controlling a water pump for a vehicle includes: determining whether an engine is on; measuring a coolant temperature of the engine and an RPM of the engine when the engine is determined to be operated; determining whether the measured coolant temperature is equal to or greater than a predetermined coolant temperature; determining an RPM of a water pump, which adjusts a coolant flow rate, from the measured coolant temperature and the measured RPM of the engine, when the measured coolant temperature is determined to be equal to or greater than the predetermined coolant temperature; and controlling the water pump such that the water pump is operated according to the determined RPM of the water pump.

An automotive vehicle includes an internal combustion engine that outputs exhaust gas from a cylinder, and an active thermal management system. The active thermal management system flows coolant around the cylinder thereby varying an exhaust temperature of the exhaust gas. An electronic engine controller controls the internal combustion engine and the active thermal management system. The engine controller generates a control signal to selectively operate the active thermal management system in a normal mode, a thermal increase mode, and a thermal decrease mode. The normal mode flows the coolant at a first coolant temperature. The thermal increase mode flows the coolant at a second coolant temperature greater than the first coolant temperature thereby increasing the exhaust temperature of the exhaust gas. The thermal decrease mode flows the coolant at a third coolant temperature less than the first coolant temperature thereby decreasing the exhaust temperature of the exhaust gas.

Methods and systems are provided for rapidly cooling an engine system of a vehicle at vehicle-off events. In one example, a method may include cooling the engine system via selecting whether to rotate a cooling fan in a first direction or a second direction based on an indication of whether temperature of the engine system decays at a faster rate under conditions where the cooling fan is rotated in the first direction as compared to the second direction, or vice versa. In this way, diagnostics that rely on static, low-noise conditions may be conducted for vehicle-off conditions that are not sufficiently long to allow for sufficient engine system cooling in a timeframe of the vehicle-off condition.

An object of this invention is to suppress the occurrence of pre-ignition by appropriately controlling a wall surface temperature of a combustion chamber based on a target temperature region in which the frequency with which pre-ignition occurs is reflected, without causing pre-ignition to actually occur. An ECU 50 acquires a wall surface temperature of a combustion chamber 14 or an engine water temperature or the like that correlates therewith as a wall temperature parameter. The ECU 50 is equipped with data for a pre-ignition suppression temperature region that is a region in which the pre-ignition occurrence frequency is smallest among temperature regions of the wall temperature parameter. In a pre-ignition susceptibility operating region A, the wall temperature parameter is controlled so as to fall within the pre-ignition suppression temperature region by operating a cooling water amount varying mechanism 38.

Methods and systems are provided for expediting engine cooling while reducing the overall energy consumption of the engine cooling system's components. A first circulation pump is used to pump coolant through an engine block as a function of engine output while a second radiator pump is selectively operated when a thermostat valve is open to pump coolant through a radiator and the engine block to effect the engine coolant temperature. Operation of the second pump is coordinated with the operation of a radiator cooling fan and grille shutters to improve radiator performance.

A method for controlling a water pump for a vehicle includes: determining whether an engine is on; measuring a coolant temperature of the engine and an RPM of the engine when the engine is determined to be operated; determining whether the measured coolant temperature is equal to or greater than a predetermined coolant temperature; determining an RPM of a water pump, which adjusts a coolant flow rate, from the measured coolant temperature and the measured RPM of the engine, when the measured coolant temperature is determined to be equal to or greater than the predetermined coolant temperature; and controlling the water pump such that the water pump is operated according to the determined RPM of the water pump.

A temperature control apparatus of a vehicle according to the invention stops activating a heat pump and supplies heat exchanging liquid from an engine passage to a battery passage when a warming of the battery is requested and a temperature of the heat exchanging liquid flowing out of the engine passage is equal to or lower than a permitted upper limit temperature. On the other hand, the apparatus activates the heat pump to cool the heat exchanging liquid and supplies the cooled heat exchanging liquid from the engine passage to the battery passage when the warming of the battery is requested and the temperature of the heat exchanging liquid flowing out of the engine passage is higher than the permitted upper limit temperature.

A cooling apparatus of an engine of the invention has a circulation passage for supplying cooling water to head and block passages through a heat exchanger. The apparatus circulates the cooling water through the circulation passage when a second condition is satisfied and then, a first condition is satisfied. The first condition includes a water supply condition that a supply of the cooling water to the exchanger is requested. The second condition includes the water supply condition and a condition that a cooling water temperature is lower than an engine completely-warmed water temperature.

A control device for an internal combustion engine includes a knock control system, a cooling system, and an electronic control unit. The knock control system is configured to ignite a spark plug an ignition crank angle obtained by retarding the ignition crank angle in response to an occurrence of the knocking. The electronic control unit is configured to supply a command value corresponding to a target value of a cooling parameter to the cooling system such that the cooling system performs cooling of the internal combustion engine according to the command value. The electronic control unit is configured to correct the command value based on a KCS learned value such that as the KCS learned value increases, a correction amount for correcting the command value increases in correction amount in a direction in which a cooling capacity of the cooling system increases.