Measuring and testing – Test stand – For engine
Patent
1981-01-26
1983-05-24
Birmiel, Howard A.
Measuring and testing
Test stand
For engine
731173, 324391, 364551, G01M 1500, F02P 1700
Patent
active
043844804
ABSTRACT:
While the crankshaft of an internal combustion engine is rotating, an encoder device produces a reference signal pulse and a series of encoder signal pulses during each crankshaft revolution and a microwave signal of a substantially constant amplitude and frequency is coupled through a microwave probe into the combustion chamber of a selected reference cylinder of the engine. The microwave signal waveform reflected from the reference cylinder combustion chamber while the reference cylinder piston approaches, passes through and moves away from the top dead center position during the compression and power strokes is processed to determine the encoder signal pulse count at which the line of symmetry thereof, the piston top dead center position, occurs. Initial ignition timing angle is then set relative to the encoder signal pulse count corresponding to the piston top dead center position.
REFERENCES:
patent: 3589177 (1971-06-01), Merlo
patent: 3703825 (1972-11-01), Merlo
patent: 4331029 (1982-05-01), Wilson
"Combustion Chamber Investigations by Means of Microwave Resonances", Merlo, IEEE Transactions, v. IECI-17 n. 2, Apr. 1970, pp. 60-66.
Krage Mark K.
Lienesch John H.
Storwick Robert M.
Birmiel Howard A.
General Motors Corporation
Meland C. R.
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