Control system for auxiliary power unit of a vehicle

A control system for a vehicle including a primary engine and a cabin defining a space, the control system comprising:

• an auxiliary power unit including an auxiliary engine, an alternator operatively coupled to the auxiliary engine and having an alternator load, and at least a portion of an air conditioning system having an evaporator positionable in communication with the cabin to condition the space with an airflow and a compressor fluidly connected to the evaporator and operatively connected to the auxiliary engine;
• a controller selectively operating the auxiliary engine, the alternator, and the compressor when the primary engine is shutdown, the controller programmed to detect a compressor parameter and to reduce the alternator load relative to the auxiliary engine in response to the detected compressor parameter, the controller further programmed to increase the alternator load relative to the auxiliary engine after a predetermined time interval and to simultaneously operate the alternator up to an alternator load capacity and the compressor up to a compressor load capacity.