초록 ▼

An apparatus is disclosed for controlling at least two driven wheels of a vehicle. The apparatus includes two hydraulic motors, each motor drivably connected to an associated drive wheel. A load sense piston pump provides a source of pressurized fluid for operating the hydraulic motors. Associated w

An apparatus is disclosed for controlling at least two driven wheels of a vehicle. The apparatus includes two hydraulic motors, each motor drivably connected to an associated drive wheel. A load sense piston pump provides a source of pressurized fluid for operating the hydraulic motors. Associated with each hydraulic motor is an electrically controllable load sense flow control valve assembly, an electrically controllable directional control valve, and a set of counterbalance valves. A microcomputer controls operation of the electrically controllable load sense flow control valve assemblies and the electrically controllable directional control valves in response to electrical signals indicative of rotary position of a steering wheel, position of an operator controlled speed and direction input device, and the speed of the vehicle engine. Steering ratio can be selected by the operator. Vehicle speed is controlled so as to prevent pump cavitation and engine stalling.

대표청구항 ▼

An apparatus for controlling propelling rotation of at least two driven wheels of a vehicle in response to rotation of a steering wheel, said apparatus comprising: a source of pressurized fluid; hydraulic motors, each drive wheel having an associated hydraulic motor for, when pressurized with said p

An apparatus for controlling propelling rotation of at least two driven wheels of a vehicle in response to rotation of a steering wheel, said apparatus comprising: a source of pressurized fluid; hydraulic motors, each drive wheel having an associated hydraulic motor for, when pressurized with said pressurized fluid, driving such motor\s associated wheel in propelling rotation; means for generating an electrical control signal having a value responsive to the rotary position of the steering wheel, each rotary position of the steering wheel resulting in a different control signal value; and means for separately controlling fluid flow rate from said source of pressurized fluid to each of the hydraulic motors in response to the value of said electrical control signal so as to control the propelling rotation speed of each driven wheel separately, the vehicle being steered as a result of the propelling rotational speed of the driven wheels, the steering angle of the vehicle being thereby functionally related to the rotary position of the steering wheel, said means for separately controlling fluid flow rate to each motor including electrically controlled valves, each motor having an electrically controlled valve connected in series between said source of pressurized fluid and such motor, and means for generating valve control signals responsive to the value of said electrical control signal so as to separately control the fluid flow rate from the source of pressurized fluid to each motor.