Patent ID: 6070650
Filing Date: 2000-06-06
Classification: B60H,B60L,F01P,Y02T

Abstract:
A vehicular air conditioning system comprising:an air conditioning compressor driven by an AC motor of three or more phases;an inverter for converting an output of a vehicular power supply into AC power to control the AC motor, the inverter having three or more output lines for supplying the AC power to each phase of the AC motor;an electrical heating unit connected to one of the output lines of the inverter so that vehicular power is supplied to the electrical heating unit through the one of the output lines of the inverter;a switching unit for switching power from the one of the output lines of the inverter to the electrical heating unit;signal generating means for generating an instruction signal to turn on the switching unit; andcontrol means for reducing an output voltage of the invertor in response to the instruction signal prior to actuating the switching unit to switch the power to the electrical heating unit.