Engine compression testing
First Claim
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1. A method of testing compression capabilities of multi-cylinder engines:
- said method comprising the step of cranking the engine with an electrically-energized starter motor;
providing a first analog signal representative of instantaneous peak starter motor current;
providing a second analog signal representative of average starter motor current;
applying the first and second signals to a comparator;
providing a NAND gate;
applying to the NAND gate a third signal representative of engine operating temperature;
applying to the NAND gate a fourth signal representing combustion inhibition;
applying to the NAND gate a fifth signal representative of piston position in the engine cylinder;
applying to the NAND gate a sixth signal representing the attainment of steady state starter motor operation;
applying the outputs of the comparator and NAND gate to a NOR gate; and
applying the output of the NOR gate to an indicator mechanism.
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Abstract
A method of testing compression capabilities of multi-cylinder engines wh are cranked with electrically-energized starter motors. The cylinders are prevented from firing, and the engine is cranked by the starter motor. During the cranking period measurements are taken of the starter motor current. A comparison of the peak current and average current provides an indication of the compression capability of the engine.
15 Citations
1 Claim
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1. A method of testing compression capabilities of multi-cylinder engines:
- said method comprising the step of cranking the engine with an electrically-energized starter motor;
providing a first analog signal representative of instantaneous peak starter motor current;
providing a second analog signal representative of average starter motor current;
applying the first and second signals to a comparator;
providing a NAND gate;
applying to the NAND gate a third signal representative of engine operating temperature;
applying to the NAND gate a fourth signal representing combustion inhibition;
applying to the NAND gate a fifth signal representative of piston position in the engine cylinder;
applying to the NAND gate a sixth signal representing the attainment of steady state starter motor operation;
applying the outputs of the comparator and NAND gate to a NOR gate; and
applying the output of the NOR gate to an indicator mechanism.
- said method comprising the step of cranking the engine with an electrically-energized starter motor;
Specification
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Current AssigneeUnited States Of America As Represented By The Secretary Of The Army (Government of the United States of America)
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Original AssigneeThe United States Of America As Represented By The Secretary Of The Army
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InventorsHanson, Richard E., Schlosser, Steven M., Hill, Lawrence M., Fineman, Howard E.
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Primary Examiner(s)Myracle, Jerry W.
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Application NumberUS05/500,418Time in Patent Office540 DaysField of Search73/116, 73/117.2, 73/115US Class Current73/114.23CPC Class CodesG01L 23/085 by measuring fluctuations o...
