Engine testing apparatus and methods

Details Engine testing apparatus and methods Engine testing apparatus and methods

1983-10-12

1985-06-04

Myracle, Jerry W.

Measuring and testing

Brake testing

73629, G01M 1500

Patent

active

045206600

ABSTRACT:
An engine timing apparatus comprises an ultrasonic transducer 8 which directs a pulsed ultrasonic beam into a cylinder and converts the reflected ultrasonic signals into electrical signals. A sample/hold circuit 67 samples this signal at a time after each pulse when signal reflected by a piston ring passing through the beam are expected. A microcomputer 65 detects changes in the level of the sampled signal caused by the piston rings as the crankshaft rotates, and receives signals from a transducer 71 indicating the crankshaft position to allow top dead center position to be found. The microcomputer receives signals from a microphone 51 directed at a fuel injector indicative of the onset of ignition and calculates the timing angle of the engine. The apparatus also calculates engine speed and detects piston slap.

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patent: 3498123 (1970-03-01), Tsuchiya
patent: 3580092 (1971-05-01), Scarpa
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patent: 3781782 (1973-12-01), Scott et al.
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patent: 4289032 (1981-09-01), Tominaga et al.
patent: 4384480 (1983-05-01), Krage et al.
patent: 4407155 (1983-10-01), Sundeen
"Ultrasonic Testing of Materials", Krautkramer-excerpts beginning on pp. 516 and 569.
"Engine Cylinder Combustion Performance Sensor", Research Disclosure, Aug. 1977.

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