Theory Of Operation

The compressor of this air conditioning system is the variable displacement type, with electric clutch engagement and external control of the displacement, via the External Control Variable Displacement (ECVD) valve. The compressors are specific for engine version and market.

The Heating, Ventilation, and Air Conditioning (HVAC) module manages the ECVD valve to increase or decrease the compressor displacement and thus the system pressure, via Pulse Width Modulation (PWM) control. External regulation of the displacement improves comfort, operation of the air conditioning system and saves the energy requested by the climate control system.