Measuring and testing – Test stand – For engine
Patent
1974-07-17
1976-03-02
Gill, James J.
Measuring and testing
Test stand
For engine
324 15, G01L 326
Patent
active
039409775
ABSTRACT:
The disclosure describes apparatus for disabling selected cylinders of an internal combustion engine operated by periodic cycles of ignition signals. The apparatus prevents one or more predetermined ignition signals in each cycle from energizing engine components, such as spark plugs, which normally receive the ignition signals. In order to achieve this purpose, a clock pulse generator generates a uniform pulse in response to the receipt of each ignition signal from the engine. Three bistable flipflop circuits are used to produce output signals having states representative of the number of clock pulses received from the clock pulse generator. Gating circuitry returns the output signals to an initial state after receipt of a predetermined number of clock pulses, such as the number of cylinders in the engine being diagnosed. As the apparatus commences operation, removable setting means set the output signals to their initial state by means of a setting pulse generated by one of the ignition signals. The repetition rate of the setting pulse is divided before being applied to the flipflop circuits in order to improve the diagnostic usefulness of the system. The transmission of the setting pulse also is delayed so that the output signals normally are returned to their initial state by the gating circuitry and clock pulses prior to the time the setting pulse is received by the flipflop circuits. A selecting circuit generates a disabling pulse in response to a predetermined state of the output signals. The disabling pulse switches a disabling device, such as a triac, to a conductive state to prevent a predetermined ignition signal from firing a selected spark plug, thereby aiding the diagnosis of the engine.
REFERENCES:
patent: 3630076 (1971-12-01), Staudt
patent: 3788129 (1974-01-01), Trussell
Caruth James R.
Leung Yam C.
Voross Zoltan
Ciarlante Anthony V.
Gill James J.
Sun Electric Corporation
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