Vibration testing apparatus
First Claim
1. A vibration testing apparatus for reciprocating internal combustion engines having a plurality of cylinders, each including at least one detonatable spark plug, comprising:
- means, mounted on the engine, for detecting the frequency of vibrations in the engine;
means for generating a signal corresponding to the detonation of the spark plug in each cylinder of the engine; and
means, responsive to the signal generating means and the detecting means, for comparing the detected vibrations in a timed sequence from each cylinder in the engine with pre-set frequencies for each cylinder and generating an output signal for each cylinder indicative of an excessive vibration frequency in any cylinder of the engine.
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Abstract
A vibration testing apparatus for detecting vibrations in a rotating internal combustion engine. The apparatus includes a sensor mounted on the engine and a timing circuit responsive to the firing of the spark plugs in the engine to generate successive time windows corresponding to the firing of each spark plug during which the frequency of vibrations are sensed by the sensor. The sensed frequencies and intensities of the vibrations are measured against pre-settable intensities for each cylinder of the engine which are settable with respect to the location of each cylinder to the sensor and, also, the firing order of each spark plug in the engine. This generates an output indicative of any excess vibrations within the engine and provides an indication of which cylinder in the engine such excess vibrations are being generated.
26 Citations
7 Claims
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1. A vibration testing apparatus for reciprocating internal combustion engines having a plurality of cylinders, each including at least one detonatable spark plug, comprising:
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means, mounted on the engine, for detecting the frequency of vibrations in the engine; means for generating a signal corresponding to the detonation of the spark plug in each cylinder of the engine; and means, responsive to the signal generating means and the detecting means, for comparing the detected vibrations in a timed sequence from each cylinder in the engine with pre-set frequencies for each cylinder and generating an output signal for each cylinder indicative of an excessive vibration frequency in any cylinder of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification