NOVELTY - The motor controller unit (14) has a memory (36). Vehicle air system pressure is monitored. Air demand generated by vehicle air system is calculated. The air compressor motor is switched from on/off mode to continuous run mode. Pressure is maintained in the air system to be between cut-in pressure threshold and increased cut-out pressure threshold. The compressor motor is maintained in the continuous run mode until air demand falls below the predetermined air demand threshold.    USE - Motor controller unit for facilitating modifying operation mode for air compressor motor in hybrid commercial vehicle.    ADVANTAGE - The compressor motor revolutions per minute (RPM ) s varied to maintain air pressure within the cut-in and cut-out pressure thresholds, such that the compressor motor does not shut off until air demand falls below the predetermined air demand threshold. The maintaining of sufficient vehicle air supply can be ensured during periods of high air demand, and the sudden disturbances on the vehicle power bus and energy losses associated with turning the compressor motor on and off can be avoided. Thus, the motor controller unit for facilitating modifying operation mode for air compressor motor in hybrid commercial vehicle can be achieved efficiently.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a method of modifying an operation mode for an air compressor motor in a hybrid commercial vehicle as a function of vehicle air demand;    (2) a system for facilitating modifying an operation mode for an air compressor motor in a hybrid commercial vehicle as a function of vehicle air demand; and    (3) an apparatus for modifying an operation mode for an air compressor motor in a hybrid commercial vehicle as a function of vehicle air demand.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the energy management system.    Motor controller unit (14)    Brake system (24)    Memory (36)    Brake pedal (44)    User interface (48)