To provide an electric seat belt device capable of predicting a regenerative current flowing when an electric motor is regenerated by a simple circuit configuration and reducing manufacturing cost.
This electric seat belt device comprises FET 1 to FET 4 forming an H bridge circuit, flywheel diodes 5-8 connected to the FET 1-FET 4, respectively, the electric motor 9 for winding up a seat belt 21, a motor current detection circuit 12 for outputting the current flowing in the electric motor 9 in the form of a current signal, an MPU 13 for outputting control signals for the electrifying direction and electrifying current amount of the electric motor 9 by the current signal, and a FET drive circuit 14 for driving, by PWM, the FET 1-FET 4 by the control signals. The motor current detection circuit 12 comprises a drive current detection circuit 15 for detecting the drive current flowing in the electric motor 9 when a drive current is supplied from a battery 10 according to the voltages at both ends of a shunt resistor 11 and a regenerative current predicting circuit 16 for predicting, from the drive current, the regenerative current flowing when the electric motor 9 is regenerated.
| JPH0971218 | PREVENTING TOOL FOR FORGETTING OF SEAT BELT FASTENING |
| WO/2004/089705 | REMOTELY LOCKABLE SEAT BELT ARRANGEMENT |
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order
Kazuhiro Oyaku
Shunichi Ueda
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