Circuit system for preventing measuring device from being errone

Details Circuit system for preventing measuring device from being errone Circuit system for preventing measuring device from being errone

1990-10-23

1992-07-07

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Identifying or correcting improper counter operation

307290, 307517, 307522, 377 20, H03K 5135, H03K 904, H03K 3013, H03K 2140

Patent

active

051289733

ABSTRACT:
A circuit system for preventing a measuring device such as an engine speed measuring device or the like from being erroneously operated includes as essential components a filter circuit, a Schmitt trigger circuit, an oscillating circuit, a counting circuit, a pulse monitoring circuit and an adding circuit. A combination of the filter circuit and the Schmitt trigger circuit serve to properly shape a wave form of each of a series of pulse-shaped sensor detection signals. The oscillating circuit generates a series of pulses each having a reference frequency. The pulse monitoring circuit monitors a wave-form shaping output pulse by counting the number of a series of output pulses each having a reference frequency for a predetermined period of time with the edge of the wave-form shaping output pulse as a trigger. In addition, the pulse monitoring circuit serves to discriminate whether a bound is caused in the wave-form shaping output signal or not and then deliver a processing signal to a processing circuit at the next stage. The circuit system has a diverging point which is located between the Schmitt circuit and the counting circuit so that a series of pulse-shaped sensor detecting signals are transmitted to the pulse monitoring circuit via the diverging point.

REFERENCES:
patent: 3553488 (1971-01-01), Darrow
patent: 3780727 (1973-12-01), King
patent: 4045687 (1977-08-01), Maringer
patent: 4349754 (1982-09-01), Bull
patent: 4694256 (1987-09-01), Kawamura
patent: 4887071 (1989-12-01), Virdee

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