Drive units for motor vehicles with internal combustion engine electric drives

Claim 1

In a drive unit for a motor vehicle, such as an industrial truck and especially for a scoop loader, having an arbitrarily actuatable speed setting adjuster for adjusting the travel speed, an internal combustion engine wherein the speed setting adjuster is connected with a control signal transmitter and with a separately excited d.c.-current generator driven by the engine and with at least one d.c. motor that is separately excited and fed by the motorgenerator, a movement signal transmitting device that gives a signal that is dependent on the state of motion of the d.c. motor and wherein the signal of the control signal transmitter and the signal of the movement signal transmitting device are fed to a speed regulating unit, whose output signal is fed to a power regulating unit that controls the field excitation of the d.c. generator, and in which the signal of the control signal transmitter is conveyed through a nominal-value integrator, which in a delayed manner modifies the signal flowing to the speed regulating unit in accordance with a prescribed program, to the speed regulating unit when there are rapid changes in the signal of the control signal transmitter, the improvement comprising at least one means in the nominal-value integrator dependent upon an operating parameter of the motor vehicle which means acts upon and influences the delay program of the nominal-value integrator.