Steer-by-wire redundant handwheel control
First Claim
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1. A method of steering a vehicle comprising:
- measuring a force applied to a steering input device and generating a force signal indicative of said force;
measuring a position of said steering input device and generating a position signal indicative of said position, said steering input device being operator-actuable;
controlling a steering output member using a steering actuator, said steering output member being mechanically isolated from said steering input device such that there is no mechanical linkage between said steering input device and said steering output member; and
in said method including a first mode of operatin and a second mode of operation, in said second mode of operation, determining from said force signal, a steering correction signal is generated controlling a steering actuator based on said steering correction signal.
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Abstract
An apparatus and method for steering a vehicle (not shown) provides an input member or steering wheel for receiving steering inputs from a user; a steering-torque sensor mechanically coupled to the input member for sensing the torque applied to the steering wheel; a control circuit electronically coupled to the steering-torque sensor for producing a signal corresponding to the measured driver steering torque; an output actuator electronically coupled to the control circuit and road wheel for receiving the electronic signal and translating it into mechanical motion; and an output member or road wheel mechanically coupled to the output actuator for steering the vehicle (not shown).
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Citations
16 Claims
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1. A method of steering a vehicle comprising:
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measuring a force applied to a steering input device and generating a force signal indicative of said force;
measuring a position of said steering input device and generating a position signal indicative of said position, said steering input device being operator-actuable;
controlling a steering output member using a steering actuator, said steering output member being mechanically isolated from said steering input device such that there is no mechanical linkage between said steering input device and said steering output member; and
in said method including a first mode of operatin and a second mode of operation, in said second mode of operation, determining from said force signal, a steering correction signal is generated controlling a steering actuator based on said steering correction signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A steering system for a vehicle comprising:
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a steering input device;
a force sensor measuring a force applied to said steering input device and generating a force signal indicative of said force;
a position sensor measuring a position of said steering input device and generating a position signal indicative of said position, said steering input device being operator-actuable;
a controller in electronic communication with a steering actuator for changing a position of a steering output member to affect a direction of said vehicle, said steering output member being mechanically isolated from said steering input device such that there is no mechanical linkage between said steering input device and said steering output member; and
said controller having a mode of operation in which said steering actuator is controlled based on a steering correction signal which in turn is based on said force signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
controlling a steering actuator based on said position signal and not on said force signal. -
16. The steering system of claim 14 wherein said mode of operation in which said steering actuator is controlled based on a steering correction signal which in turn is based on said force signal is employed when said position sensor is judged to be faulty.
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Specification