Control apparatus for hydraulic driving vehicle

摘要

In a hydraulic driven vehicle of the present invention, an engine 1 drives a variable displacement hydraulic pump 2. A hydraulic motor 3 is driven by hydraulic oil supplied from the hydraulic pump 2. A rotation number of the engine 1 is detected by an engine rotating speed detecting means 15, and a driving speed is detected by a driving speed detecting means 16. A control means 12 determines a set value for pump displacement of the hydraulic pump 2 by calculating with a function. The function is set so as to make the set value in a high speed zone larger than the set value in a low speed zone. Accordingly, in a HST type hydraulic driven vehicle, fuel efficiency is improved in the high speed zone.