Patent ID: 6260642
Filing Date: 2001-07-17
Classification: B62D,E02F

Abstract:
A steering control system for a tracklaying vehicle comprising a spring actuated clutch and a spring actuated brake provided for each of right and left drive wheels, electronic proportional control valves for controlling the clutches and the brakes by controlling oil pressure to release the energizing force of the springs, a steering lever, a steering command signal generator for generating a steering command signal according to the operating amount of the steering lever, and a controller for outputting a steering control signal to the electronic proportional control valves based on the output of the steering command signal generator, and a tractive force detecting means for detecting the tractive force of the vehicle,wherein if the tractive force detecting means determines that the vehicle is in a high load driving state, the controller outputs a steering control signal to the electronic proportional control valves in order to obtain a hydraulic characteristic for expanding the region of a clutch in which a clutch oil pressure changes continuously in relation to changes of the lever stroke and reducing the region of a brake in which a brake oil pressure changes continuously in relation to changes of the lever stroke.