An hybrid vehicle control system controls the output from one of two prime movers installed on the vehicle by reference to available angular acceleration rates for the first and second prime movers. When angular acceleration is called for and the prime mover having greater capacity for angular acceleration is active, acceleration is limited to that which would have been available from the lower capacity prime mover. One application of the system is to provide consistent throttle responsiveness, particularly for a power take-off operation vocation installed on the vehicle.