Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Field control – or field and armature control – by analog...
Reexamination Certificate
2007-09-18
2007-09-18
Donovan, Lincoln (Department: 2837)
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Field control, or field and armature control, by analog...
C318S132000, C318S254100, C318S434000, C388S800000, C388S801000, C388S807000, C388S816000
Reexamination Certificate
active
11242308
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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Bolz Michael
Prokscha Martin
Donovan Lincoln
Smith Tyrone
Tarolli, Sundheim Covell & Tummino LLP
TRW Automotive GmbH
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