| 摘要 |
<P>PROBLEM TO BE SOLVED: To determine whether lubricating oil, other than lubricating oil for an electric compressor, is accidentally mixed in a refrigerant in a hybrid ECU 1. <P>SOLUTION: The hybrid ECU 1 detects insulation resistance R1 in the OFF state of switching elements SW1, SW2, to SW6 in step S200, detects insulation resistance R2 in the ON-state of switching elements SW4, SW5 and SW6, before driving a motor 10 in step S220, and detects an insulation resistance R3, after determining elimination of sleeping of the refrigerant after driving the motor 10 in step S230. When it is determined using the insulation resistances R1, R2 and R3 that the lubricating oil, other than lubricating oil for the electric compressor, is accidentally mixed in the refrigerant, the fact that the lubricating oil other than lubricating oil for the electric compressor is accidentally mixed in the refrigerant is recorded as self-diagnosis history in memory 1b. <P>COPYRIGHT: (C)2010,JPO&INPIT |
