Abstract: A cooling control system for an internal combustion engine, which is capable of efficiently driving an electric water pump, thereby improving fuel economy as much as possible while properly performing cooling of supercharged intake air by an intercooler. The engine to which the present invention is applied includes a turbocharger for supercharging intake air and is configured such that electrical power is generated by a generator using the engine as a motive power source, during a decelerating fuel-cut operation in which fuel supply is stopped. The cooling control system of the present invention includes the intercooler of water-cooled type which cools the intake air supercharged by the turbocharger by using coolant circulating through an intake air cooling circuit and an electric pump for circulating the coolant through the intake air cooling circuit, and drives the electric pump during the decelerating fuel-cut operation.

Abstract: An intake air cooling apparatus abnormality detection system for an engine includes a first intake air temperature sensor that detects an intake air temperature in an intake pipe at the downstream side of an intercooler and a second intake air temperature sensor that detects the intake air temperature in an intake manifold. An abnormality determination unit determines that an abnormality occurs in an intercooler cooling water circuit if a state in which at least one of a value based on an output from the first intake air temperature sensor and a value based on an output from the second intake air temperature sensor exceeds a predetermined threshold value continues for a certain time or longer when a load state determination unit determines that the engine is in a high load state.

Abstract: An internal combustion engine cooling system, including: an internal combustion engine; a cooling circuit in which cooling fluid for cooling the internal combustion engine is circulated; a radiator for cooling the cooling fluid; a radiator circuit that branches from the cooling circuit to guide the cooling fluid to the radiator and return the cooling fluid having passed the radiator to the cooling circuit; a thermostat that is provided in a portion where the cooling circuit and the radiator circuit are connected to each other and that opens and closes a path between cooling circuit and the radiator circuit; a heater for heating the thermostat; and a control device for controlling the heater.

Abstract: A cooling control system for an internal combustion engine, which is capable of efficiently driving an electric water pump, thereby improving fuel economy as much as possible while properly performing cooling of supercharged intake air by an intercooler. The engine to which the present invention is applied includes a turbocharger for supercharging intake air and is configured such that electrical power is generated by a generator using the engine as a motive power source, during a decelerating fuel-cut operation in which fuel supply is stopped. The cooling control system of the present invention includes the intercooler of water-cooled type which cools the intake air supercharged by the turbocharger by using coolant circulating through an intake air cooling circuit and an electric pump for circulating the coolant through the intake air cooling circuit, and drives the electric pump during the decelerating fuel-cut operation.

Abstract: An intake air cooling apparatus abnormality detection system for an engine includes a first intake air temperature sensor that detects an intake air temperature in an intake pipe at the downstream side of an intercooler and a second intake air temperature sensor that detects the intake air temperature in an intake manifold. An abnormality determination unit determines that an abnormality occurs in an intercooler cooling water circuit if a state in which at least one of a value based on an output from the first intake air temperature sensor and a value based on an output from the second intake air temperature sensor exceeds a predetermined threshold value continues for a certain time or longer when a load state determination unit determines that the engine is in a high load state.

Abstract: An internal combustion engine cooling system, including: an internal combustion engine; a cooling circuit in which cooling fluid for cooling the internal combustion engine is circulated; a radiator for cooling the cooling fluid; a radiator circuit that branches from the cooling circuit to guide the cooling fluid to the radiator and return the cooling fluid having passed the radiator to the cooling circuit; a thermostat that is provided in a portion where the cooling circuit and the radiator circuit are connected to each other and that opens and closes a path between cooling circuit and the radiator circuit; a heater for heating the thermostat; and a control device for controlling the heater.

Abstract: A misfire state discrimination system of an internal combustion engine, which determines the occurrence of misfire under engine operating conditions that make misfire determination possible and counts the number of misfires to compare with a reference value. The misfire state of the engine is discriminated based on the result of comparison. In the system, when the engine operation moves from the conditions that makes the misfire determination possible, the count is saved and is counted up from the count when the engine operation returns to the condition. The saved count is also retained when the engine is stopped. Similarly, the number of combustion during which the determination of misfire occurrence is made is counted and the count is saved. This arrangement enables a rapid and accurate discrimination of the misfire state of the engine.

Abstract: A misfire state discrimination system of an internal combustion engine, which determines the occurrence of misfire under engine operating conditions that make misfire determination possible and counts the number of misfires to compare with a reference value. The misfire state of the engine is discriminated based on the result of comparison. In the system, when the engine operation moves from the conditions that makes the misfire determination possible, the count is saved and is counted up from the count when the engine operation returns to the condition. The saved count is also retained when the engine is stopped. Similarly, the number of combustion during which the determination of misfire occurrence is made is counted and the counted is saved. This arrangement enables a rapid and accurate discrimination of the misfire state of the engine.

Abstract: A misfire-detecting system for an internal combustion engine includes a temperature sensor for detecting a temperature of the engine, and an ECU which carries out detection of a misfire occurring in the engine when the detected temperature falls within a predetermined region. A load condition of the engine is detected, and the predetermined region is changed according to the detected load condition of the engine.