Electricity: measuring and testing – Magnetic – Displacement
Patent
1991-09-27
1997-04-15
Snow, W.
Electricity: measuring and testing
Magnetic
Displacement
G01B 700, G01R 33025
Patent
active
056213158
ABSTRACT:
An apparatus for detecting an angular position of a crankshaft of an internal combustion engine includes a disk which is rotatable in synchronism with the rotation of the crankshaft, a row of magnetic elements disposed on the disk along a circumferential periphery thereof at circumferentially equal intervals, an electromagnetic pick-up device disposed orthogonally to a plane of rotation of the disk in opposition to the row of magnetic elements, and a shaping circuit for shaping an output signal of the electromagnetic pick-up device into a rectangular waveform signal. The shaping circuit is combined integrally with the electromagnetic pick-up device into a single unit to prevent external noise from being superposed on the output signal from the pick-up device. The shaping circuit includes an integrator for integrating the output signal to produce a reference signal for the comparator. Additionally, the shaping circuit may include a rectifying/smoothing circuit for rectifying and smoothing the output signal of the pick-up device to produce a level signal, and a high-pass filter circuit having a cut-off frequency which is variable in dependence on a change in the level signal. The output signal of the pick-up device is input to the comparator after having passed through the high-pass filter circuitry so that a pulsating noise component superposed on the pick-up output signal and having a frequency corresponding to the engine rotation speed is satisfactorily eliminated. Thus, accuracy and reliability of the engine control can be remarkably improved.
REFERENCES:
patent: 4408159 (1983-10-01), Prox
patent: 4694688 (1987-09-01), Takahashi et al.
patent: 4835467 (1989-05-01), Gokhale
Ikeuchi Masayuki
Shinjo Izuru
Mitsubishi Denki & Kabushiki Kaisha
Snow W.
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