Drive system with serially arranged variable displacement componentry

摘要

A vehicle and drive system control method for a vehicle including first and second traction elements coupled to the vehicle, a variable displacement pump, a bi-directional variable displacement first motor coupled to the first traction element, and a bi-directional second motor coupled to the second traction element. The pump, and first and second motors are coupled fluidly in series with one another. A control unit can determine a desired speed for the traction elements, and determine pump, first and/or second motor displacements based on the desired speed. First and second speed sensors can sense output speeds of the motors, and the pump, first and/or second motor displacements can be determined based on the motor output speeds. Articulation and steering sensor signals can also be used to determine pump, first and/or second motor displacements.

主权项

1. A vehicle, comprising:
a first traction element coupled to the vehicle; a second traction element coupled to the vehicle; a variable displacement pump; a bi-directional variable displacement first motor coupled to the first traction element; a bi-directional second motor coupled to the second traction element; a steering sensor configured to sense a first steering angle indicative of a steering angle of the first traction element; and a control unit configured to: receive one or more input signals; determine a second steering angle indicative of a steering angle of the second traction element based on the first steering angle; determine a desired speed for the first and second traction elements based on the one or more input signals; determine a pump displacement for the pump based on the desired speed; determine a first motor displacement for the first motor based on the desired speed; and output a pump control signal commanding the pump to the determined pump displacement, and a first motor control signal commanding the first motor to the determined first motor displacement; wherein the pump and the first and second motors are coupled fluidly in series with one another.