Patent ID: 8919140

Claim:
A cooling system for a machine having an engine and an operator cabin, the cooling system comprising: a primary air conditioning unit; an auxiliary air conditioning unit; an electrical power unit configured to electrically power the auxiliary air conditioning unit; a sensor configured to generate a signal indicative of a temperature within the operator cabin; and a controller in communication with the primary air conditioning unit, the auxiliary air conditioning unit, and the sensor, the controller being configured to: selectively activate the primary air conditioning unit only during operation of the engine when the signal indicates the temperature within the operator cabin is outside of an acceptable range of a desired temperature; selectively activate the auxiliary air conditioning unit during shutdown of the engine when the signal indicates the temperature within the operator cabin is outside of an acceptable range of the desired temperature; initiate tracking of elapsed time when the signal indicates that the temperature within the operator cabin is outside of the acceptable range of the desired temperature; and selectively activate the auxiliary cooling unit to augment a cooling capacity of the primary air conditioning unit when the elapsed time exceeds a threshold time.