Rear steering control for a vehicle

摘要

A steering system and method are described for a vehicle having steerable front and rear wheels. A rear hydraulic steering device may be coupled to one or more of the rear wheels. A rear valve assembly may hydraulically control the rear hydraulic steering device to steer the rear wheels based upon a rear steering command. In a rear steering assist mode, the rear steering command may be determined based upon a manual steering input received at a steering input device. In an automated steering mode, the rear steering command may be determined based upon a target path of the agricultural vehicle that is determined independently of the manual steering input.

主权项

1. A steering system for an agricultural vehicle having one or more steerable front wheels, one or more steerable rear wheels, and a steering input device configured to receive a manual steering input for the one or more steerable front wheels, the steering system comprising:
at least one controller; a front hydraulic steering device coupled to at least one of the one or more steerable front wheels; and a front valve assembly configured to hydraulically control the front hydraulic steering device in order to steer the at least one steerable front wheel based upon, at least in part, a front steering command from the controller; a rear hydraulic steering device coupled to at least one of the one or more steerable rear wheels; and a rear valve assembly configured to hydraulically control the rear hydraulic steering device in order to steer the at least one steerable rear wheel based upon, at least in part, a rear steering command from the controller; wherein, in a rear steering assist mode, the front hydraulic steering device steers the at least one steerable front wheel based upon, at least in part, the manual steering input, and the controller determines the rear steering command based upon, at least in part, the manual steering input; and wherein, in an automated steering mode, the front valve assembly controls the front hydraulic steering device to automatically steer the at least one steerable front wheel based upon, at least in part, the front steering command, the front steering command being based upon, at least in part, a target path of the agricultural vehicle, and the controller determines the rear steering command based upon, at least in part, the target path of the agricultural vehicle that is determined independently of the manual steering input.