초록 ▼

A steering control system for a tracked vehicle includes an engine driven variable displacement steering pump which drives a hydraulic motor. The motor drives a differential drive mechanism which drives left and right track drive wheels. An electronic control unit, as a function of steering wheel po

A steering control system for a tracked vehicle includes an engine driven variable displacement steering pump which drives a hydraulic motor. The motor drives a differential drive mechanism which drives left and right track drive wheels. An electronic control unit, as a function of steering wheel position, vehicle speed, engine speed, forward/reverse vehicle direction and other parameters, generates a command signal which controls the swashplate of the steering pump. The system operates so that, for a given position of the steering wheel, a turn curvature of the vehicle decreases as vehicle speed increases, wherein turn curvature is inversely proportional to a radius of turn. This is accomplished by calculating a turn speed value equal to the vehicle speed multiplied by a ratio of a nominal engine speed divided by sensed engine speed, and by calculating the command signal equal to a steering gain value multiplied by a ratio of the turn speed value divided by a nominal vehicle speed value.

대표청구항 ▼

[ What is claimed is:] [1.] A steering control system for a tracked vehicle having an engine-driven variable displacement pump which is responsive to a control signal and which drives a steering motor which drives a differential track drive mechanism, an operator manipulated steering member, and hav

[ What is claimed is:] [1.] A steering control system for a tracked vehicle having an engine-driven variable displacement pump which is responsive to a control signal and which drives a steering motor which drives a differential track drive mechanism, an operator manipulated steering member, and having left and right tracks driven by the differential drive mechanism, the control system comprising:a vehicle speed sensor for generating a vehicle speed signal;an engine speed sensor for generating an engine speed signal;a rotary position sensor coupled to the steering member and generating a steering signal representing a position of the steering member; anda control unit for generating the control signal as a function of the vehicle speed signal, the engine speed signal and the steering signal to control speed of said motor and thereby control a turning radius of the vehicle.