Method for controlling automotive sliding doors
First Claim
1. A method for controlling a powered sliding door system including a motor, a control unit for controlling said motor, a sliding door guided along a substantially linear path, and a power transmission unit for converting an output power of said motor to a sliding motion of said door, comprising the steps of:
- defining a standard operating parameter associated with a motion of said door under a standard condition of said door when said motor is actuated under a standard operating condition;
measuring an actual operating parameter associated with a motion of said door under an existing condition of said door when said motor is actuated under a standard operating condition in an early interval of the motion of said door;
computing a measure of a load acting on said door by comparing the actual operating parameter with the standard operating parameter; and
determining a drive parameter for controlling said motor so as to move said door at a prescribed speed irrespective of the load acting said the door.
1 Assignment
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Accused Products
Abstract
In a method for controlling a powered sliding door system, a standard time period for the sliding door to pass a calibration interval defined near a fully closed position under a standard duty ratio condition is measured, and the duty ratio of the drive pulse signal for the motor in the remaining interval of operation is determined from this standard time period so that the sliding door may move at a prescribed speed irrespective of the load acting on the door. This control method can be favorably used in combination with the process of detecting an obstacle in the path of the sliding door, which is based on the detection in the reduction in the speed of the sliding door, without any interference between them.
64 Citations
20 Claims
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1. A method for controlling a powered sliding door system including a motor, a control unit for controlling said motor, a sliding door guided along a substantially linear path, and a power transmission unit for converting an output power of said motor to a sliding motion of said door, comprising the steps of:
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defining a standard operating parameter associated with a motion of said door under a standard condition of said door when said motor is actuated under a standard operating condition;
measuring an actual operating parameter associated with a motion of said door under an existing condition of said door when said motor is actuated under a standard operating condition in an early interval of the motion of said door;
computing a measure of a load acting on said door by comparing the actual operating parameter with the standard operating parameter; and
determining a drive parameter for controlling said motor so as to move said door at a prescribed speed irrespective of the load acting said the door. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling a powered sliding door system including a motor, a control unit for controlling said motor, a sliding door guided along a substantially linear path, and a power transmission unit for converting an output power of said motor to a sliding motion of said door, comprising the steps of:
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defining a schedule of target speed for the sliding motion of said door;
measuring an actual sliding speed of said door;
computing a deviation of the actual sliding speed from said target speed; and
adjusting a duty ratio of the drive signal for said motor at a prescribed increment so as to offset said deviation at a timing which depends on the magnitude of said deviation. - View Dependent Claims (9, 10, 18, 20)
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11. A method for controlling a powered sliding door system including a motor, a control unit for controlling said motor, a sliding door guided along a substantially linear path, and a power transmission unit for converting an output power of said motor to a sliding motion of said door, comprising the steps of:
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defining a schedule of target speed for the sliding motion of said door;
measuring an actual sliding speed of said door;
computing a deviation of the actual sliding speed from said target speed; and
adjusting a duty ratio of the drive signal for said motor at a prescribed increment so as to offset said deviation at a timing which depends on the position of said door. - View Dependent Claims (12, 13, 19)
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14. A method for detecting an obstacle for a sliding door in a powered sliding door system including a motor, a control unit for controlling said motor according to a schedule of standard speed, a sliding door guided along a substantially linear path, and a power transmission unit for converting an output power of said motor to a sliding motion of said door, comprising the steps of:
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measuring the speed of said motor at a prescribed cycle;
comparing the speed of said motor at a current cycle with a modified speed of said motor of the previous cycle which is given as a sum of the speed of said motor of a previous cycle and a prescribed tolerance value; and
detecting an obstacle for said door when the speed of said motor at the current cycle continues to be smaller than the modified speed of said motor of the previous cycle for a prescribed number of cycles;
said tolerance value being adjusted depending on an operating parameter of said powered sliding door system during a course of a sliding motion of said door. - View Dependent Claims (15, 16, 17)
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Specification