Controlling current supplied to electric motor of a seat belt retractor
First Claim
1. A method for adjusting a supply current to an electric motor that is situated in a control circuit and produces torque that is transferred to a belt reel of a seat belt retractor of a motor vehicle in dependence on at least one driving situation or a driving condition of the vehicle, comprising the steps of:
- (a) measuring a motor current of the electric motor during the torque generation;
(b) comparing the motor current measured in step (a) as a controlled variable with a command variable that may be adjusted to different intensities as a function of different driving situations or conditions; and
(c) adjusting the torque transferred to the belt reel by controlling the supply current for the electric motor situated in the control circuit, wherein the current supplied to the electromotor as a control variable is produced from the comparison between the measured motor current and the command value of the current, in a circuit in which the electromotor is positioned.
11 Assignments
0 Petitions
Accused Products
Abstract
A method and a device for adjusting a supply current, which feeds an electric motor, the torque of which is transferred to a belt reel of a seat belt retractor of a motor vehicle, whereby the motor current of the electric motor is measured during the torque generation and compared as a controlled variable with a command variable, which is adjusted depending on at least one driving situation or at least one driving condition of the vehicle, for controlling the supply current for the electric motor situated in the control circuit.
47 Citations
9 Claims
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1. A method for adjusting a supply current to an electric motor that is situated in a control circuit and produces torque that is transferred to a belt reel of a seat belt retractor of a motor vehicle in dependence on at least one driving situation or a driving condition of the vehicle, comprising the steps of:
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(a) measuring a motor current of the electric motor during the torque generation; (b) comparing the motor current measured in step (a) as a controlled variable with a command variable that may be adjusted to different intensities as a function of different driving situations or conditions; and (c) adjusting the torque transferred to the belt reel by controlling the supply current for the electric motor situated in the control circuit, wherein the current supplied to the electromotor as a control variable is produced from the comparison between the measured motor current and the command value of the current, in a circuit in which the electromotor is positioned. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for adjusting a supply current in the supply current circuit of an electric motor, the torque of which is to be transferred to a belt reel of a seat belt retractor, whereby an adjustment device for the torque is connected to a sensor device for detecting one or more driving situations or driving conditions of the vehicle, wherein the adjustment device predetermines a specific value of the current as a function of a driving situation detected in each case and the electric motor is arranged in a current control circuit that comprises:
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(a) a current measuring device for measuring the motor current in a generated torque, (b) a comparator connected to the current measuring device, and compares the predetermined specific value of current with the measured motor current, characterized in that the electromotor is positioned in a control loop, and in that the comparator is connected to a current adjuster in the supply circuit of the electromotor which current adjuster adjusts the supply current as a supply variable of the electromotor as a function of the deviation established in the comparator.
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Specification