Patent ID: 9031747
Filing Date: 2015-05-12
Classification: B62D

Abstract:
1. A method of operating an electric power steering system, applicable for superimposing a driver demand and a driver assistance device demand value to calculate a driver requested support value, the method comprising: calculating a virtual driver support value on the basis of the driver demand; calculating a correction driver support value on the basis of a driver assistance device demand value; calculating the driver requested support value as a combination of the correction driver support value and the virtual driver support value; and controlling a motor of the electric power steering system using the driver requested support value, wherein calculating the correction driver support value includes: calculating an intermediate correction driver support value on basis of the driver assistance device demand value; comparing an absolute value of the intermediate correction driver support value with an assistance limit; if the absolute value of the intermediate correction driver support value exceeds the assistance limit, then multiplying the intermediate correction driver support value with a limiting factor to get the correction driver support value, wherein the limiting factor has a value, which is less than one and greater than or equal to zero, and if the absolute value of the intermediate correction driver support value is less than the assistance limit, then setting the correction driver support value as to the intermediate correction driver support value.