Controller for an electric power assisted steering system and an electric power assisted steering system
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United States of America Patent
Stats
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Jul 24, 2001
Grant Date -
N/A
app pub date -
Sep 29, 1998
filing date -
Mar 30, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A controller for an electric power assisted steering system comprises a drive circuit (2) for controlling current to a motor (1) and a data processor (8) for controlling the motor current and hence assistance torque. A circuit (9) generates a current limit which is a monotonically decreasing function of vehicle speed. A comparator (6) compares motor current with the current limit and switches off the drive circuit (2) if the current limit is exceeded.
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