Method and control circuit for driving an electric motor of a seatbelt retractor
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United States of America Patent
Stats
-
Sep 18, 2007
Grant Date -
Apr 6, 2006
app pub date -
Oct 3, 2005
filing date -
Oct 4, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An electric motor drives a belt spool of a seatbelt retractor in a vehicle using a micro-controller and a drive circuit that drives the electric motor. A plurality of PWM control signal sources are provided each of which has a trigger input and a control signal output. Each control signal source, upon application of a trigger pulse to its trigger input, provides on its control signal output a control pulse of a duration different from durations of control pulses of all other control signal sources. A set of motor control programs are permanently stored in the micro-controller. A program selection signal is sent to the micro-controller from a central sensor unit in the vehicle. Trigger pulses are sent by the micro-controller to the trigger inputs of the control signal sources. Particular ones of the control signal sources are selected for application of their signal outputs to the drive circuit in a control sequence defined by a selected control program.
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