Compressor Load Torque
The variable load torque is derived from the evaporator temperatures (requested setting and actual) by the IHKA to generate the PWM signal for the solenoid valve to deflect the swash plate. The physical compressor load torque requirement is calculated by the IHKA control module and sent to the ECM over the K-CAN Bus.
Torque Limitation
The IHKA receives a K-CAN message from the ECM containing a maximum specified torque. Under full throttle/kick down and at high coolant temperatures, the ECM uses this signal to restrict the maximum possible compressor load torque.