Electric power steering apparatus
AssigneeNsk Ltd.
InventorTakahiro Tsubaki
Life of this patent
Estimating the term…
Abstract
An electric power steering apparatus that can suppress deterioration of steering feeling by changing a current command value of a normal system in motor control by two systems when an abnormality occurs in any of the systems. The steering apparatus calculates a current command value to a motor having two-system motor windings for each system, comprises a current command value adjusting section that calculates the current command value by using a steering assist command value and a compensation current command value.
Claims8
An electric power steering apparatus that assists and controls a steering system by calculating, for each of two system motor windings of a motor, a current command value and driving said motor based on said current command value calculated for said each of said two system motor windings, comprising:
- a current command value adjusting section that calculates said current command value by using a steering assist command value and a compensation current command value,
- wherein said current command value adjusting section has a normal-time coefficient used at normal time and an abnormal-time coefficient used at abnormal time that are set for said each of said two systems, a value obtained by multiplying a value obtained by adding said steering assist command value and said compensation current command value by said normal-time coefficient is said current command value when said two systems are normal, and a value obtained by adding said compensation current command value to a value obtained by multiplying said steering assist command value by said abnormal-time coefficient is said current command value to a normal system of said two systems when an abnormality occurs in one of said two systems.
An electric power steering apparatus that assists and controls a steering system by calculating, for each of two system motor windings of a motor, a current command value and driving said motor based on said current command value calculated for said each of said two system motor windings, comprising:
- a current command value adjusting section that calculates said current command value by using a steering assist command value and a compensation current command value,
- wherein said current command value adjusting section has a normal-time coefficient used at normal time and a first abnormal-time coefficient and a second abnormal-time coefficient used at abnormal time that are respectively set to said each of said two systems, a value obtained by multiplying a value obtained by adding said steering assist command value and said compensation current command value by said normal-time coefficient is said current command value when said two systems are normal, and a value obtained by adding a value obtained by multiplying said steering assist command value by said first abnormal-time coefficient and a value obtained by multiplying said compensation current command value by said second abnormal-time coefficient is said current command value to a normal system of said two systems when an abnormality occurs in one of said two systems.
Dependencies are inferred from the claim text.