METHOD AND APPARATUS OF CONTROL OF AN HYDRAULIC AUTOMATIC GEAR BOX

摘要

The invention relates to a method and device for controlling an automatic hydraulic gearbox provided with a hydraulic pump and a motor with adjustable displacement. The pressure of the hydraulic fluid is measured (A) at the intake (P-av) and feedback (P-ret) of the motor. By reducing/increasing the displacement by switching, creating a temporary relative flow excess (+/-dQ) of the pump/motor fluid, the temporary excess (+/- dQ) is diverted (B) according to the pressure measured, and the temporary flow excess is recycled (C) towards the intake or feedback of the motor. The invention can be used in vehicles for transporting or handling heavy or bulky loads.