Patent ID: 6857986
Filing Date: 2005-02-22
Classification: B60W,F16H,Y10T

Abstract:
1. An apparatus for controlling a plurality of hydraulic motors and a clutch in which a single driving shaft is driven by outputs of a plurality of hydraulic motors, and one of the plurality of hydraulic motors drives the driving shaft through the clutch, comprising: a first servo valve that controls the tilt rotation amount of a first hydraulic motor, and sets the tilt rotation amount of the first hydraulic motor to a zero tilt rotation amount when a zero fixing pressure (Pcs=Pf) of a predetermined value is input, wherein the clutch is disengaged when a release pressure (Pk) of a predetermined value that is larger than the zero fixing pressure (Pf) of the predetermined value is input; hydraulic vehicle speed detecting means for detecting a vehicle speed by a vehicle speed signal pressure (Pv) based on a vehicle speed; and control valve means that releases an output command pressure (Pcs) to a return pressure (Pt) connected to a tank until a vehicle speed signal pressure (Pv) received from the hydraulic vehicle speed detecting means reaches a start pressure (Pb) of a predetermined value, and begins to output the command pressure (Pcs) to the first servo valve and the clutch when the vehicle speed signal pressure (Pv) exceeds the start pressure (Pb) of the predetermined value.