Electricity: motive power systems – Automatic and/or with time-delay means – With respect to a fixed standard – master or reference device
Patent
1984-10-19
1986-05-13
Shoop, Jr., William M.
Electricity: motive power systems
Automatic and/or with time-delay means
With respect to a fixed standard, master or reference device
318128, 318129, 318268, 318301, 318305, 318444, H02P 706, H02P 729
Patent
active
045889341
ABSTRACT:
An automobile fan controller comprises: a fluctuation signal generator for generating a fluctuation signal; a pulse-width-modulation circuit including a triangle generator for generating a triangle-waveform signal having a constant amplitude and a constant period, and a comparator connected to the fluctuation signal generator and the triangle generator, for comparing the fluctuation signal with the triangle-waveform signal, thereby producing a pulse signal having a pulse width variable dependent on the fluctuation signal; and a driver circuit, including a switching power transistor connected to the pulse-width-modulation circuit, a fan motor mounted on an automobile, and an air flow switching unit mounted on the automobile for energizing and de-energizing said fan motor with a variable pulse width in response to the pulse signal. In this fan controller air flow delivered from an automobile fan driven by the fan motor can fluctuate at a fluctuation amplitude in response to an air flow range set by an automobile driver by connecting the automobile fan controller to the fan motor.
REFERENCES:
patent: 3241023 (1966-03-01), Eby
patent: 4218749 (1980-08-01), Babaud et al.
patent: 4495560 (1985-01-01), Sugimoto
Ito Hideaki
Suzuki Yasuhiko
Kabushiki Kaisha Toyota Chuo Kenkyusho
Ro Bentsu
Shoop Jr. William M.
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