Method for the selectable supplementary hydraulic drive of wheels on a vehicle

摘要

Method for the selectable supplementary hydraulic drive of wheels on a vehicle to main drive wheels controlled by an engine by way of a torque converter or gearbox by the automotive control of a closed hydraulic operating circuit with wheel motors fed by a variable delivery pump, and a variable delivery pump and a control pump directly driven by the motor, the operating fluid flow and/or pressure being controlled by the controllable control pump flow, and overlapping with the operating fluid flow control, the operating fluid pressure being controlled according to the behaviour of a function preselectable according to the ratio of the engine to converter stages or transmission output speed.