Hydrostatically driven vehicle with retarder valve

Abstract

A vehicle having a hydrostatic drive and a hydraulic control apparatus, in which the hydrostatic drive has a variable displacement hydraulic pump and a hydraulic motor in a closed circuit, an internal combustion engine for driving the hydraulic pump and a variable displacement pump, producing a volumetric output flow, of an open circuit, and a retarder valve arranged in the open circuit and intended for the hydraulic absorption of braking energy. The retarder valve has a valve and a pressure-limiting valve, connected thereto, for throttling the volumetric output flow of the variable displacement pump. The variable displacement hydraulic pump, the variable displacement pump and the retarder valve are controlled by a digital electronic unit for the respective driving and working functions.

Dependencies are inferred from the claim text.