Patent ID: 6155955
Filing Date: 2000-12-05
Classification: F02D,Y10T

Abstract:
A method of operating a motor vehicle driving unit having:a prime mover coupled to supply driving power to both a driving transmission and at least one drive consuming device, the prime mover generating a prime mover torque which is controllable by a motor control unit, and a load transmitter coupled to the prime mover to at least partially control operation thereon, the method comprising the steps of:drivingly branching off, at a location before the driving transmission, a torque flow to said at least one drive consuming device;providing an admissible input torque to the drive transmission which is lower than a potentially maximum prime mover torque;controlling the prime mover torque, via the motor control unit, to a certain position greater than the position of the load transmitter depending on an actual torque flow to said at least one drive consuming device to provide at least partial compensation for the torque flow reaching said at least one drive consuming device;limiting the prime mover torque by an upper limit which corresponds to a sum of the admissible input torque to the driving transmission and the actual torque flow to said at least one drive consuming device so as to prevent an overload of the driving transmission in case of a low torque flow to said at least one drive consuming device;receiving, in said transmission control unit (24), said signal (30) used to determine the torque flow to said at least one drive consuming device;generating, in said transmission control unit (24), a maximum admissible prime mover torque signal (38);receiving, in said motor control unit (26), said maximum admissible prime mover torque signal (38) generated by said transmission control unit (24);receiving, in said motor control unit (26), a load signal (32) directly from said load transmitter; andcontrolling the prime mover so that the actual prime mover torque is prevented for exceeding a maximum admissible prime mover torque.