| 摘要 |
An electrical power assisted steering system is disclosed having a boost curve (5) which has inverse symmetry about a zero input torque value, each half of the boost curve (5) comprising a first portion (10) defined by a first polynomial equation between a zero value and a first value, and a second portion (11) defined by a second polynomial between a second value and a third value, in which the gradient of the first portion of the curve at the first value is equal to the gradient of the second portion of the curve at the second value. By storing values for the first, second and third values and the gradient of each polynomial at those values a smooth boost curve can be defined by storing only a small amount of parameters. <IMAGE> |
