초록 ▼

A malfunction of a thermostat in a coolant circulating path is detected from an engine side coolant temperature in consideration of the following behavior of the coolant temperature. When an open-malfunction occurs, the coolant temperature becomes different considerably from that in the normal time

A malfunction of a thermostat in a coolant circulating path is detected from an engine side coolant temperature in consideration of the following behavior of the coolant temperature. When an open-malfunction occurs, the coolant temperature becomes different considerably from that in the normal time in the temperature range in which the thermostat is to be normally closed. When a closure-malfunction occurs, the coolant temperature becomes different considerably from that during the normal time in the temperature range in which the thermostat is to be normally opened. Alternatively, the malfunction may be detected from a difference between the engine side coolant temperature and a radiator side coolant temperature.

대표청구항 ▼

A malfunction of a thermostat in a coolant circulating path is detected from an engine side coolant temperature in consideration of the following behavior of the coolant temperature. When an open-malfunction occurs, the coolant temperature becomes different considerably from that in the normal time

A malfunction of a thermostat in a coolant circulating path is detected from an engine side coolant temperature in consideration of the following behavior of the coolant temperature. When an open-malfunction occurs, the coolant temperature becomes different considerably from that in the normal time in the temperature range in which the thermostat is to be normally closed. When a closure-malfunction occurs, the coolant temperature becomes different considerably from that during the normal time in the temperature range in which the thermostat is to be normally opened. Alternatively, the malfunction may be detected from a difference between the engine side coolant temperature and a radiator side coolant temperature. the vehicle speed is higher than a first predetermined speed and a lower than a second predetermined speed that is larger than the first predetermined speed.5. The air conditioner according to claim 1, further comprisingair temperature adjusting means for adjusting temperature of air blown into the passenger compartment by adjusting a heating degree due to the heater core, wherein,when the air temperature adjusting means adjusts the heating degree at the maximum degree, the heating capacity determining means determines that the heating capacity of the heater core is lower than the predetermined capacity.6. The air conditioner according to claim 1, further comprising:target air temperature calculating means for calculating a target temperature of air blown into the passenger compartment, wherein,when the target temperature of air blown into the passenger compartment is lower than a predetermined temperature, the heating capacity determining means determines that the heating capacity is larger than the predetermined capacity.7. The air conditioner according to claim 1, further comprising:an outside air detecting unit for detecting temperature of outside air, wherein,when the temperature of the outside air is higher than a predetermined temperature, the heating capacity determining means determines that the heating capacity is larger than the predetermined capacity.8. The air conditioner according to claim 1, further comprising:an inside air temperature detecting unit for detecting temperature of inside air inside the passenger compartment, wherein,when the temperature of the inside air is higher than a predetermined temperature, the heating capacity determining means determines that the heating capacity is larger than the predetermined capacity.9. The air conditioner according to claim 1, further comprising:a vehicle speed detecting unit for detecting a vehicle speed, wherein,when the vehicle speed is lower than a predetermined speed, the heating capacity determining means determines that the heating capacity is larger than the predetermined capacity.10. The air conditioner according to claim 1, wherein the fluid supplied to the heater core is cooling water for cooling one of an engine and a fuel cell mounted on the vehicle.11. The air conditioner according to claim 1, wherein the fluid supplied to the heater core is cooling water for cooling an engine of the vehicle, the air conditioner further comprisinga radiator for cooling the cooling water by performing a heat exchange between the cooling water and outside air, wherein,when the cooling water is cooled in the radiator, the heating capacity determining means determines that the heating capacity is larger than the predetermined capacity.12. The air conditioner according to claim 1, wherein the fluid supplied to the heater core is cooling water for cooling an engine mounted on the vehicle, the air conditioner further comprisinga rotation speed detecting unit for detecting a rotation speed of the engine, wherein,when the rotation speed of the engine is higher than a predetermined speed, the heating capacity determining means determines that the heating capacity is larger than the predetermined capacity.13. The air conditioner according to claim 1, wherein:the fluid supplied to the heater core is cooling water for cooling an engine mounted on the vehicle;when a passed time from a start of the engine is larger than a predetermined time, the heating capacity determining means determines that the heating capacity is larger than the predetermined capacity.14. The air conditioner according to claim 1, wherein,in the defrosting operation, the heat pump cycle is controlled to be operat