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Method for controlling a lumbar support device in a powered seat and motor control device provided therein in association therewith

  • US 5,243,267 A
  • Filed: 10/06/1992
  • Issued: 09/07/1993
  • Est. Priority Date: 10/06/1992
  • Status: Expired due to Fees
First Claim
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1. A method for controlling a lumbar support device in a powered seat, in which said lumbar support device includes a lumbar plate for pressingly supporting a lumbar part of an occupant on the seat, and a motor, which is adapted to cause a fore-and-aft movement of said lumbar plate relative to a seat back of said powered seat, said motor is controlled under a plurality of motor drive control modes, said method comprising the steps of:

  • providing, as one of said motor drive control modes, a manual control mode allowing said occupant to manually control a drive of said motor to apply to predetermined lumbar support force to said lumbar part of said occupant;

    providing, as one of said motor drive control modes, a burst control mode for controlling said drive of said motor so as to effect said fore-and-aft movement of said lumbar plate in a periodic way;

    providing, as one of said motor drive control mode, a fluctuation control mode for controlling said drive of said motor so as to effect said fore-and-aft movement of said lumbar plate in an aperiodic way;

    wherein said burst and fluctuation control modes are effected in an automatic control mode;

    permitting a selection to be done for one of said burst and fluctuation control modes;

    causing said motor, if said burst control mode is selected, to be driven by operation of a burst switch means in a generally periodic way, with a pause time given per period, so as to repeat said fore-and-aft movement of said lumbar plate in said generally periodic way for a predetermined time, such that said lumbar plate is kept still per said pause time within said predetermined time; and

    causing said motor, if said fluctuation control mode is selected, to be driven by operation of a fluctuation switch means in said aperiodic way for a predetermined time so as to repeat said fore-and-aft movement of said lumbar plate in conformity with said aperiodic way, within a predetermined fore-and-aft movement range;

    wherein, in said fluctuation control mode, the aperiodic drive of said motor is effected according to a predetermined number of drive times and a predetermined number of drive amount, both of which are set on a basis of a predetermined number of frequency portions and a predetermined number of period portions which are both obtained from a 1/f fluctuation waveform synthesized under a predetermined Fourier series.

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