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US 6,854,554 B2Granted
Joystick steering on power machine with filtered steering input
AssigneeClark Equipment Company
InventorsKenneth A. Brandt, Scott R. Rossow
Life of this patent
Estimating the term…
Abstract
A user input device in accordance with one features of the present invention includes one or more joysticks, movable by a user in an operator compartment of a power machine. The joysticks control direction of movement of the power machine, as well as travel speed.
Claims23
A control system for a power machine having steerable wheels, comprising:
- a joystick assembly having a joystick movable relative to a neutral position, the joystick assembly providing a joystick position signal indicative of a displacement of the joystick from the neutral position;
- a filter coupled to the joystick assembly and configured to receive the joystick position signal and filter unwanted frequency components from the joystick position signal to provide a filtered position signal;
- and
- a controller providing a wheel steering control signal controlling a steering angle of the wheels based on the filtered position signal.
1 more element
A control system for a power machine having steerable wheels, comprising:
- a joystick assembly having a joystick movable relative to a neutral position, the joystick assembly providing a joystick position signal indicative of a displacement of the joystick from the neutral position, wherein the joystick assembly comprises:
- a hand grip;
- a user actuable input coupled to the hand grip;
- and
- a joystick controller mounted to the handgrip and providing an output indicative of a position of the joystick and a state of the user actuable input;
- a filter coupled to the joystick assembly and configured to receive the joystick position signal and filter unwanted frequency components from the joystick position signal to provide a filtered position signal;
- and
- a controller providing a wheel control signal controlling the wheels based on the filtered position signal.
5 more elements
A power machine, comprising:
- a plurality of individually steerable wheels;
- a plurality of steering motors coupled to the wheels to steer the wheels;
- a traction motor driving rotation of the wheels;
- a joystick assembly having a joystick movable relative to a neutral position, the joystick assembly providing a joystick position signal indicative of a displacement of the joystick from the neutral position;
- a filter coupled to the joystick assembly and configured to receive the joystick position signal and filter unwanted frequency components from the joystick position signal to provide a filtered position signal;
- and
- a controller providing a wheel steering control signal to the steering motors and the traction motor to control a steering angle of the wheels based on the filtered position signal.
4 more elements
A power machine comprising:
- a plurality of individually steerable wheels;
- a plurality of steering motors coupled to the wheels to steer the wheels;
- a traction motor driving rotation of the wheels;
- a joystick assembly having a joystick movable relative to a neutral position, the joystick assembly providing a joystick position signal indicative of a displacement of the joystick from the neutral position, wherein the joystick assembly comprises:
- a hand grip;
- a user actuable input coupled to the hand grip;
- and
- a joystick controller mounted to the handgrip and providing an output indicative of a position of the joystick and a state of the user actuable input;
- a filter coupled to the joystick assembly and configured to receive the joystick position signal and filter unwanted frequency components from the joystick position signal to provide a filtered position signal;
- and
- a controller providing a wheel control signal to the steering motors and the traction motor controlling the wheels based on the filtered position signal.
8 more elements
A control system for a power machine having pivotable wheels comprising:
- a joystick assembly having a joystick movable relative to a neutral position, the joystick assembly providing a joystick position signal indicative of a displacement of the joystick from the neutral position;
- a low pass filter coupled to the joystick assembly and configured to receive the joystick position signal and filter frequency components in excess of 2.5 Hertz from the joystick position signal to provide a filtered position signal;
- and
- a controller providing a wheel control signal controlling the wheels, including wheel pivoting, based on the filtered position signal.
1 more element
Dependencies are inferred from the claim text.