Title :
Fault tolerant control for an electric power steering system
Author :
Lawson, Matthew ; Chen, Xiang
Author_Institution :
Dept. of Electr. & Comput. Eng., Windsor Univ., Windsor, ON
Abstract :
Electric power steering (EPS) systems are rapidly replacing existing traditional hydraulic power steering systems due to fuel and cost savings. Methods to improve the reliability of a column mounted EPS are presented. This is accomplished by introducing a fault tolerant scheme for a torque sensor failure; that is, if the sensor signal is lost, this information can still be obtained and used to maintain the power steering assist function. A motor model based observer is used to estimate the total torque on the motor shaft, combined with an independent estimate of the road reaction torque, in order to calculate the torque sensor output. Hardware-in-the-loop (HIL) results are presented to validate the method under more realistic operating conditions.
Keywords :
fault tolerance; road vehicles; sensors; steering systems; three-term control; torque control; electric power steering system; fault tolerant control; hydraulic power steering systems; motor shaft; power steering assist function; road reaction torque; torque sensor failure; Control systems; Costs; Fault tolerance; Fault tolerant systems; Fuels; Maintenance; Power steering; Power system reliability; Steering systems; Torque;
Conference_Titel :
Control Applications, 2008. CCA 2008. IEEE International Conference on
Conference_Location :
San Antonio, TX
Print_ISBN :
978-1-4244-2222-7
Electronic_ISBN :
978-1-4244-2223-4
DOI :
10.1109/CCA.2008.4629701
