A cooling system of an internal combustion engine includes a plurality of components in the form of heat sources, coolant pumps, actuator devices, and temperature sensors that are fluidically connected to one another via coolant lines, wherein a plurality of cooling circuits, each including at least one of the various components, is formed. In addition, a control device is provided that is in signal-conducting connection with at least one of the temperature sensors, with at least one of the coolant pumps, and with at least one of the actuator devices. The control device stores information concerning the association of the individual components with the various cooling circuits and their specific arrangement relative to one another in the individual cooling circuits, information concerning which of the coolant pumps during operation brings about a coolant flow in the individual cooling circuits, information concerning which actuator device(s) may be used to set a volume flow of the coolant by the individual heat sources, and information concerning a setpoint temperature that is stored for each of the heat sources, The control device also is designed to automatically set a volume flow of coolant through the heat sources that is required for reaching the setpoint temperatures, by appropriate control of the particular coolant pump(s) and actuator device(s).

Methods and systems are provided for monitoring a status of a heater core isolation valve (HCIV) housing in an engine coolant circuit including a first coolant loop and a second coolant loop. In one example, a method may include indicating degradation of the HCIV based on a difference between a first coolant loop temperature and a second coolant loop temperature upon activation of coolant system pumps and deactivation of a positive temperature coefficient (PTC) heater housed in the cabin heating loop.

A cooling control device includes a switching valve, an electric motor, and a controller. The switching valve has a coolant outlet. The coolant outlet is configured such that a coolant flows through the coolant outlet. The electric motor is configured to operate the switching valve to switch connecting and shutting off between the coolant outlet and a coolant transporting unit. The controller is configured to determine a duty ratio of a signal for controlling the electric motor on a basis of the temperature of the coolant over a predetermined period of time after the electric motor starts operating the switching valve.

A heat exchange system for a vehicle includes: a first cooling circuit (L1-1, L1-2) is configured to cool an internal combustion engine a second cooling circuit (L2-1, L2-2) is configured to cool a driving electric motor outputs a driving force; a first heat exchanger (106) is configured to exchange heat between the first cooling circuit and the second cooling circuit; a first sensor (151) is configured to detect a temperature of the first cooling circuit; a second sensor (152) is configured to detect a temperature of the second cooling circuit; and a controller (155) is configured to execute control of performing heat exchange between a coolant in the first cooling circuit and a coolant in the second cooling circuit using the first heat exchanger when the temperature detected by the first sensor is lower than the temperature detected by the second sensor.

An exhaust purification system of an internal combustion engine comprises a filter 23 arranged in an exhaust passage 23 of an internal combustion engine in which a plurality of cylinders 61, 62, 63, 64 cooled by cooling water are provided and trapping particulate matter in exhaust gas, a wall temperature calculation part 51 configured to calculate or detect wall temperatures of a predetermined number of equal to or more than two cylinders among the plurality of cylinders, and a PM amount calculation part 52 configured to calculate an amount of particulate matter discharged from the plurality of cylinders to the exhaust passage based on the wall temperatures calculated or detected by the wall temperature calculation part.

A cooling system includes an electric pump, a cooling target temperature sensor, a coolant temperature sensor, and an electronic control unit. The electric pump pumps a coolant to a circulation channel connected to an inlet and an outlet of a cooling channel in which heat is exchanged with a cooling target. The cooling target temperature sensor detects a cooling target temperature. The coolant temperature sensor is arranged upstream of the inlet in the circulation channel, and detects a coolant temperature. The electronic control unit controls driving of the electric pump so that a discharge flow rate of the electric pump matches a target flow rate, and sets the target flow rate using an equation based on a reference value obtained by dividing a difference between the cooling target temperature and a target cooling temperature of the cooling target by a difference between the cooling target temperature and the coolant temperature.

A method for detecting a contaminant in a vehicle coolant system during service includes contacting a chromophore impregnated strip and a heat transfer fluid sample, where the chromophore impregnated strip includes a complexing agent selected to form a complex with the contaminant that causes a color change in the chromophore impregnated strip and thereby indicates the presence of the contaminant in the heat transfer fluid sample.

A cooling system for an internal combustion engine of a motor-vehicle presenting a circuit for a coolant of the engine. The circuit includes a thermally insulated tank for the coolant of the engine, connected to an outer portion of the cooling circuit. The tank is arranged in the circuit to retain a defined quantity of coolant at a temperature above the ambient temperature when the engine is inactive, and for causing this quantity of coolant to flow, at a temperature above the ambient temperature, into the cooling circuit of the engine, after a subsequent start of the engine, during an engine warm up stage. The circuit also includes an expansion vessel connected to the outer circuit portion of the coolant of the engine. The expansion vessel has a thermally insulated body and constitutes the thermally insulated tank for the engine coolant.

A cooling system of an internal combustion engine includes a plurality of components in the form of heat sources, coolant pumps, actuator devices, and temperature sensors that are fluidically connected to one another via coolant lines, wherein a plurality of cooling circuits, each including at least one of the various components, is formed. In addition, a control device is provided that is in signal-conducting connection with at least one of the temperature sensors, with at least one of the coolant pumps, and with at least one of the actuator devices. The control device stores information concerning the association of the individual components with the various cooling circuits and their specific arrangement relative to one another in the individual cooling circuits, information concerning which of the coolant pumps during operation brings about a coolant flow in the individual cooling circuits, information concerning which actuator device(s) may be used to set a volume flow of the coolant by the individual heat sources, and information concerning a setpoint temperature that is stored for each of the heat sources, The control device also is designed to automatically set a volume flow of coolant through the heat sources that is required for reaching the setpoint temperatures, by appropriate control of the particular coolant pump(s) and actuator device(s).

Models that employ both measurable engine parameters as well as predictable engine parameters may be used to determine when a thermostat is malfunctioning before the thermostat malfunction results in an engine breakdown. Particular models may be used to provide an estimated coolant temperature and an estimated thermostat position. The estimated coolant temperature can be compared to an actual measured engine coolant temperature. The estimated thermostat position can be evaluated with respect to what the thermostat position should be given a particular engine coolant temperature. In some cases, comparison between a healthy model and a faulty model may be used to ascertain thermostat health.