Motorized seatbelt retractor
First Claim
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1. A seatbelt retractor controlling system, comprising:
- a motor configured to generate a rotational torque for driving a seatbelt retractor;
a first electric control unit comprised of a first micro computer for controlling a rotational speed of said motor; and
a second electric control unit comprised of a second micro computer which can communicate with an on-board controller or on-vehicle sensor;
wherein said second micro computer comprises a driving mode selecting portion which selects one of driving modes for controlling said motor based on a signal from said on-board controller or a sensor; and
said first micro computer acquires a buckle switch signal about the on-off state of a buckle switch corresponding to seat belt retractor without passing through said communication line, and selects one of driving modes stored previously in said first micro computer based on the selected mode of said driving mode selecting portion, and controls a driving current supplied to said motor based on the buckle switch signal and the selected driving mode.
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Abstract
Each ECU in a system configuration based on a motorized seatbelt retractor having an ECU combined with a motor shortens the harness length along which many currents flow as much as possible. A main ECU and a subsidiary ECU each have functions corresponding to those are provided to a control unit for controlling a motor for a motorized seatbelt retractor. The main ECU determines output start conditions and transmits commands, and the subsidiary ECU autonomously performs detailed motor current control and the like.
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Citations
10 Claims
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1. A seatbelt retractor controlling system, comprising:
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a motor configured to generate a rotational torque for driving a seatbelt retractor; a first electric control unit comprised of a first micro computer for controlling a rotational speed of said motor; and a second electric control unit comprised of a second micro computer which can communicate with an on-board controller or on-vehicle sensor; wherein said second micro computer comprises a driving mode selecting portion which selects one of driving modes for controlling said motor based on a signal from said on-board controller or a sensor; and said first micro computer acquires a buckle switch signal about the on-off state of a buckle switch corresponding to seat belt retractor without passing through said communication line, and selects one of driving modes stored previously in said first micro computer based on the selected mode of said driving mode selecting portion, and controls a driving current supplied to said motor based on the buckle switch signal and the selected driving mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification