Chabaan Rakan C, Wang Le Yi. Control of electrical power assist systems H∞ design, torque estimation and structural stability[J]. JSAE Review, 2001(22) :435--444.
Nobuo S, Yukihiro F. Electric power steering with H-infinity control designed to obtain road information[C] // Proceeding of the American Control Conference, Albuquerque of New Mexico, 1997:2 935-2 939.