| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-conditioner for a vehicle allowing use of a heater able to warm inside a cabin sufficiently while balancing is well taken with the load of an electric power supply for the vehicle. SOLUTION: The air-conditioner 30 for the vehicle includes a PTC heater fed with current from a 12-V battery 18 as the power supply for the vehicle and warming inside the cabin and an ECU 32 etc. for air-conditioning. A current feed determining part 34 determines whether the PTC heater 50 should be fed with current or not on the basis of signals given by a warming switch 44 and a water temperature sensing means 22 for engine cooling water, while a load determining means determines whether the power supply for the vehicle is an overloaded condition based on the context of a signal line 48 from a DC/DC converter 16, and a current feed controlling means performs an intermittent current feed control using a current feed On/Off ratio with which the temperature of the PTC heater 50 can rise, in case there is necessity for feeding the current to the PTC heater 50 and the power supply for the vehicle is overloaded. COPYRIGHT: (C)2007,JPO&INPIT
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