초록 ▼

A tracked vehicle includes an engine driven variable displacement steering pump which drives hydraulic steering motor. The steering motor drives a differential drive mechanism which drives left and right track drive wheels. A steering control system senses the position of a non-spring centered steer

A tracked vehicle includes an engine driven variable displacement steering pump which drives hydraulic steering motor. The steering motor drives a differential drive mechanism which drives left and right track drive wheels. A steering control system senses the position of a non-spring centered steering wheel, vehicle speed, engine speed, steering motor speed, whether or not the transmission is in gear or in neutral, and whether the clutch is engaged or disengaged. In order to prevent a self-perpetuating turn situation, the control system gradually decreases the steering motor speed if the transmission is in neutral or the clutch is not engaged, and the steering motor speed divided by the vehicle speed is greater than a threshold, and the vehicle speed is less than a reference level.

대표청구항 ▼

[ What is claimed is:] [1.] A steering control system for a tracked vehicle having an engine which drives a transmission which is coupled to a differential track drive mechanism, the track drive mechanism having a steering motor which drives left and right tracks at a relative speed which is a funct

[ What is claimed is:] [1.] A steering control system for a tracked vehicle having an engine which drives a transmission which is coupled to a differential track drive mechanism, the track drive mechanism having a steering motor which drives left and right tracks at a relative speed which is a function of the steering motor speed, an operator manipulated non-centered steering input member, the steering control system controlling the speed of the steering motor in response to manipulation of the steering input member, and comprising:a motor speed sensor for sensing a speed of the steering motor;a vehicle speed sensor for sensing vehicle speed;a ratio value generator for generating a ratio value representing a ratio of the steering motor speed to the vehicle speed; anda speed limiter for preventing increases in steering motor speed if said ratio value is greater than a threshold.