Continuous estimation of surface friction coefficient based on EPS and vehicle models
AssigneeSteering Solutions IP Holding Corporation
InventorsMariam Swetha George, Shrenik P. Shah, Farhad Bolourchi, Tejas M. Varunjikar
Life of this patent
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Abstract
A system and a method of controlling a power steering system of a vehicle are provided. A control system includes a control module operable to determine a rack force of the vehicle based on at least one of a motor velocity, a driver torque and a motor torque, determine a plurality of modeled rack forces based on a roadwheel angle and a vehicle speed, compare the rack force to the plurality of modeled rack forces to generate a friction level included in a control signal, and send the control signal to the power steering system.
Claims18
A control system for a power steering system of a vehicle, comprising:
- a control module operable to receive sensor data and control the power steering system, the control module configured to:
- determine a first rack force of the vehicle based on a motor velocity, a driver torque and a motor torque;
- determine a plurality of second modeled rack forces based on a roadwheel angle and a vehicle speed;
- compare the first rack force to the plurality of second modeled rack forces to generate a friction level;
- and
- send a control signal indicative of the friction level to the power steering system to provide operator feedback corresponding to the friction level.
A method of controlling a power steering system of a vehicle, the method comprising:
- determining, by a control module, a first rack force of the vehicle based on at least one of a motor velocity, a driver torque and a motor torque;
- determining, by the control module, a plurality of second modeled rack forces based on a roadwheel angle and a vehicle speed;
- comparing, by the control module, the first rack force to the plurality of second modeled rack forces to generate a friction level;
- and
- sending, by the control module, a control signal indicative of the friction level to the power steering system for providing friction feedback to an operator.
A non-transitory computer readable medium having stored thereon instructions for executing a method of controlling a power steering system of a vehicle, the method comprising:
- determining a first rack force of the vehicle based on at least one of a motor velocity, a driver torque and a motor torque;
- determining a plurality of second modeled rack forces based on a roadwheel angle and a vehicle speed;
- comparing the first rack force to the plurality of second modeled rack forces to generate a friction level;
- and
- sending a control signal indicative of the friction level to the power steering system to adjust power steering operation corresponding to the friction level.
Dependencies are inferred from the claim text.