| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and a control circuit, in which very versatile safe and comfortable features can be attained only by adding electronic components of the basic properties to simple and inexpensive microcontrollers. <P>SOLUTION: An electric motor 44 drives a belt spool of a seat belt retractor for vehicles that use drive circuits 18, 36 for driving a microcontroller 16 and the motor. Each PWM control signal source 22 supplies a control signal with duration time different from the control pulses of other PWM control signal sources to its control signal outputs, when a trigger pulse is impressed to its trigger inputs. A program selection signal is supplied from a central sensor unit of a vehicle, to the trigger inputs of the PWM control signal sources. The PWM control signal sources that supply signal outputs from the PWM control signal sources to the drive circuits, in a control sequence defined by the selected control program. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
