Method for controlling a lumbar support device in a powered seat and motor control device provided therein in association therewith
First Claim
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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Accused Products
Abstract
A method for controlling a lumbar support device and a motor control device provided, which are applied to a powered seat. The motor for causing fore-and-aft movement of a lumbar plate is controlled under a selected one of burst and fluctuation control modes. In the burst control mode, the lumbar plate is moved periodically in the fore-and-aft direction, whereas in the fluctuation control mode, the lumbar plate is moved in a aperiodic and weavering way in that direction, for example, on the basis of 1/f fluctuation waveform, to thereby alleviate a fatigue of lumbar part of a passenger sitting on the seat.
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Citations
8 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
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5. A motor control device in a powered seat for controlling a lumbar support device, in which said lumbar support device includes a lumbar plate for pressingly supporting a lumbar part of an occupant on the seat, said motor control device comprising:
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a motor for causing a fore-and-aft movement of said lumbar plate with respect to a seat back of said seat; a manual switch means operable to manually control a drive of said motor, thus effecting a manual control mode so as to permit a manual adjustment of a position of said lumbar plate in a fore-and-aft direction; a burst control switch means operable to effect a burst control mode for controlling said drive of said motor in a periodic way, so as to repeat said fore-and-aft movement of said lumbar plate in generally periodic way; a fluctuation control switch means operable to effect a fluctuation control mode for controlling said drive of said motor in an aperiodic way, so as to repeat said fore-and-aft movement of said lumbar plate in said aperiodic way; wherein said burst and fluctuation control modes are both effected as an automatic control mode; a drive circuit including a switching element for driving or stopping said motor; a detection means for detecting a position of said lumbar plate; a central processing unit which processes an input data according to a predetermined program and controls at least said motor; and a means for permitting a selection to be done for one of said manual control mode and said automatic control mode. - View Dependent Claims (6, 7, 8)
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Specification