ELECTRIC POWER STEERING DEVICE

PROBLEM TO BE SOLVED: To stabilize a control system of an electric power steering device provided with a plurality of motors. SOLUTION: This device is provided with first and second motors Ma and Mb at different positions on a steering torque transmission path for transmitting steering torque inputt...

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Bibliographic Details
Main Authors YOSHIDA JUNICHI, HAMAMOTO KYOJI, SUDO MASAHITO
Format Patent
LanguageEnglish
Published 03.03.2005
Edition7
Subjects
LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
MOTOR VEHICLES
PERFORMING OPERATIONS
TRAILERS
TRANSPORTING
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Summary:PROBLEM TO BE SOLVED: To stabilize a control system of an electric power steering device provided with a plurality of motors. SOLUTION: This device is provided with first and second motors Ma and Mb at different positions on a steering torque transmission path for transmitting steering torque inputted into a steering handle to wheels. Based on the steering torque detected by a steering toque sensor St, an electronic control unit U controls current to be supplied to the first and second motors Ma and Mb. The electronic control unit U is provided with compensation means 42a and 42b for compensating the phase of the steering torque. By separately compensating gain and phase of the steering torque for each of the first and second motors Ma and Mb, even if assist torque of the first and second motors Ma and Mb is different in a torque transmission characteristic transmitted to the steering torque sensor St, stability of the control system of the device is enhanced, and excellent steering feeling close to a manual steering device can be obtained. COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20030286440