Measuring and testing – Vehicle chassis – Steering
Patent
1976-05-07
1977-08-23
Myracle, Jerry W.
Measuring and testing
Vehicle chassis
Steering
G01M 1500
Patent
active
040431894
ABSTRACT:
In a combustion engine, such as a diesel engine, the periodic displacement of an engine component member having a cyclic function directly related to the piston stroke of an engine cylinder, is detected by a proximity sensor disposed adjacent to an area through which the component member is periodically displaced, the sensor providing a series of cylinder identification (CID) signal pulses having a peak amplitude in dependence on the spatial distance between the sensor and the member at that position in its displacement cycle at which it is in close proximity to the sensor, and having a period in dependence on the periodicity of the member displacement cycle, the occurrence of each CID signal pulse being directly related to, and representative of the piston stroke through a reference piston position. Each CID signal is detected and signal conditioned to provide a conditioned CID (CID*) signal and its complement (CID*) signal, the interval between the leading edges of each defining a CID interval over which a plurality of tooth signals, provided by proximity sensing of the ring gear teeth of the engine flywheel assembly, are counted to provide a total tooth count for the CID interval which is divided by two and stored for one full period of the sensor CID signal. The instantaneous tooth count provided during an immediately succeeding CID interval is continuously compared with the stored half tooth count from the preceding interval in a magnitude comparator, which provides a discrete output signal when the instantaneous tooth count from the succeeding CID interval exceeds the stored half tooth count from the immediately preceding CID interval, the leading edge of the discrete signal representing the displacement of the cylinder piston through the reference piston position.
REFERENCES:
patent: 3864963 (1975-02-01), Rivere
patent: 3942365 (1976-03-01), Hanson et al.
Chiantera Dominic J.
Myracle Jerry W.
United Technologies Corporation
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