METHOD OF MOUNTING AN ACCELEROMETER ON AN INTERNAL COMBUSTION ENGINE AND INCREASING SIGNAL-TO-NOISE RATIO
First Claim
1. A method of mounting an accelerometer to an internal combustion engine, the method comprising the steps of:
- (a) securing the accelerometer to a mating surface on an engine component, the mating surface being external to a combustion chamber of the engine and located where the accelerometer can generate a signal output that is characteristic of engine knock when it occurs and at least one other combustion behavior inside the combustion chamber during at least a portion of a compression stroke or a combustion stroke associated with the combustion chamber;
(b) connecting a signal wire at one end to the accelerometer and at an opposite end to a signal processor; and
(c) increasing the signal output'"'"'s signal-to-noise ratio by taking at least one of the following steps;
adapting the mating surface on the engine component to have a surface flatness of no more that 0.002 inches (0.05 millimeters) Total Indicator Reading;
adapting the mating surface on the engine component to have a surface roughness Rz of no more than 16 micro-inches (0.40 micrometers);
anchoring the signal wire to stationary components of the engine, to reduce signal noise that might otherwise be generated by movement of the signal wire;
shielding the signal wire using a conductive sheath or integrated shielding to reduce signal noise; and
applying a viscous liquid between the accelerometer and the mating surface before securing the accelerometer and filling voids therebetween with the viscous liquid, thereby increasing stiffness of the connection when the accelerometer is secured to the mating surface.
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Abstract
A method of mounting an accelerometer to an internal combustion engine comprises securing the accelerometer to a mating surface on an engine component external to a combustion chamber where the accelerometer can generate a signal output that is characteristic of engine knock, when it occurs, and at least one other combustion behavior inside the combustion chamber during a combustion event. The method further comprises connecting a signal wire at one end to the accelerometer and at an opposite end to a signal processor, and increasing the signal output'"'"'s signal-to-noise ratio.
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Citations
62 Claims
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1. A method of mounting an accelerometer to an internal combustion engine, the method comprising the steps of:
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(a) securing the accelerometer to a mating surface on an engine component, the mating surface being external to a combustion chamber of the engine and located where the accelerometer can generate a signal output that is characteristic of engine knock when it occurs and at least one other combustion behavior inside the combustion chamber during at least a portion of a compression stroke or a combustion stroke associated with the combustion chamber;
(b) connecting a signal wire at one end to the accelerometer and at an opposite end to a signal processor; and
(c) increasing the signal output'"'"'s signal-to-noise ratio by taking at least one of the following steps;
adapting the mating surface on the engine component to have a surface flatness of no more that 0.002 inches (0.05 millimeters) Total Indicator Reading;
adapting the mating surface on the engine component to have a surface roughness Rz of no more than 16 micro-inches (0.40 micrometers);
anchoring the signal wire to stationary components of the engine, to reduce signal noise that might otherwise be generated by movement of the signal wire;
shielding the signal wire using a conductive sheath or integrated shielding to reduce signal noise; and
applying a viscous liquid between the accelerometer and the mating surface before securing the accelerometer and filling voids therebetween with the viscous liquid, thereby increasing stiffness of the connection when the accelerometer is secured to the mating surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. An internal combustion engine comprising:
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(a) an accelerometer secured to a mating surface of an engine component, wherein the mating surface is external to a combustion chamber of the engine and located where the accelerometer can generate a signal output that is characteristic of engine knock when it occurs and at least one other combustion behavior inside the combustion chamber during at least a portion of a compression stroke or a combustion stroke associated with the combustion chamber, wherein the mating surface is machined to have a flatness and a surface roughness that increases the signal output'"'"'s signal-to-noise ratio;
(b) a signal processor that can receive and process the signal output generated by the accelerometer to detect engine knock when it occurs and the at least one other combustion behavior; and
(c) a signal wire connected at one end to the accelerometer and at an opposite end to the signal processor. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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Specification