An electronic thermostat, into which cooling water is flowed from a cylinder head of an engine through a first inlet, controls the flow rate of the received cooling water supplied to outside ambient air exposure. The electronic thermostat includes a first valve for controlling the flow rate of the cooling water supplied to a first passage for connecting a first outlet of the electronic thermostat and a water pump and includes a second valve for controlling the flow rate of the cooling water flowing through a second passage for connecting the outlet of a radiator and a cylinder block of the engine.

An engine and cabin thermal management system for use with a vehicle having an engine, a cabin heating system configured to thermally heat a cabin of the vehicle, a coolant system operably coupled to the engine and to the cabin heating system to thermally manage a temperature of the engine and a temperature of the cabin. The coolant system having one or more coolant thermal storage units fluidly coupled with a radiator and heater core of the coolant system forming a coolant loop. The system further having a control system configured to monitor and maintain at least a predetermined coolant temperature at the cabin heating system even during a coolant temperature decrease at the engine stops.

Methods and systems are provided for cooling charge air in a hybrid engine. In one example, a method may include cooling charge air by a combination of air-to-air and air-to-coolant heat transfer with assistance from a chiller arranged in the coolant circuit. The coolant circuit includes an insert coupled to a charge air cooler allowing heat exchange via conduction and convection.

The separation efficiency of carbon dioxide is improved by making the temperature of exhaust gas further low. An exhaust gas purification apparatus for an internal combustion engine includes a first heat exchanger arranged in an exhaust passage of an internal combustion engine and configured to carry out heat exchange between outside air and exhaust gas of the internal combustion engine, a second heat exchanger arranged in the exhaust passage and configured to carry out heat exchange between a circulating heating medium and the exhaust gas, and a carbon dioxide separator arranged in the exhaust passage at the downstream side of the first heat exchanger and the second heat exchanger and configured to separate carbon dioxide from the exhaust gas.

A coolant circuit of an engine cooling apparatus includes a first passage where coolant flows through a radiator and a second passage where coolant flows without passing through the radiator. A coolant control valve controls a first passage flow rate Frad and a second passage flow rate Fsec. An outlet coolant temperature sensor detects an outlet coolant temperature Tout, which is a coolant temperature before a branching point of the first passage and the second passage. An inlet coolant temperature sensor detects an inlet coolant temperature Tin, which is a coolant temperature after a merging point of the first passage and the second passage. A coolant temperature estimator calculates a radiator coolant temperature Trad, which is a coolant temperature at a coolant exit of the radiator, when the first passage flow rate Frad is greater than or equal to a specified flow rate using equation (1). $\begin{array}{cc}\mathrm{Trad}=\mathrm{Tin}-\left(\mathrm{Tout}-\mathrm{Tin}\right)\frac{\mathrm{Fsec}}{\mathrm{Frad}}& \left(1\right)\end{array}$

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 controller includes at least one processor coupled to a memory storing instructions that, when executed by the at least one processor, cause the at least one processor to: determine a target engine outlet coolant temperature for a coolant in an engine system; determine an adjustment to a temperature of the coolant based on a determined engine inlet coolant temperature and the target engine outlet coolant temperature; and, alter a flow of the coolant by controlling a coolant valve in response to the determination of the adjustment to the temperature of the coolant.

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.

Methods and systems are provided for a control device for adjusting coolant flow. In one example, the control device may be shaped to receive charge air, engine coolant, and charge-air cooler coolant to adjust a flow of charge-air cooler coolant to a radiator.

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.