Control apparatus for an internal combustion engine
First Claim
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1. A control apparatus for a multi-cylinder internal combustion engine comprising:
- vibration sensing means for generating an output signal having a level corresponding to the amplitude of low-frequency engine vibrations due to misfiring;
comparator means for detecting misfiring by comparing the level of the output signal of the vibration sensing means with a reference level indicating the occurrence of misfiring; and
fuel supply control means responsive to the comparator means for identifying which cylinder of the engine is misfiring when the comparator means detects misfiring and stopping the supply of fuel to the misfiring cylinder.
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Abstract
A control apparatus for an internal combustion engine has a vibration sensor which senses engine vibrations and a low-pass filter which passes a low-frequency component of the output of the vibration sensor. A comparator detects misfiring when the level of the low-frequency component exceeds a prescribed reference level. When misfiring is detected, a microcomputer identifies the misfiring cylinder and stops the supply of fuel to the misfiring cylinder. The control apparatus may also include a knocking suppression device responsive to a component of the output signal of the vibration sensor.
63 Citations
15 Claims
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1. A control apparatus for a multi-cylinder internal combustion engine comprising:
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vibration sensing means for generating an output signal having a level corresponding to the amplitude of low-frequency engine vibrations due to misfiring; comparator means for detecting misfiring by comparing the level of the output signal of the vibration sensing means with a reference level indicating the occurrence of misfiring; and fuel supply control means responsive to the comparator means for identifying which cylinder of the engine is misfiring when the comparator means detects misfiring and stopping the supply of fuel to the misfiring cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for sensing misfiring of a multi-cylinder internal combustion engine comprising:
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measuring the level of engine vibrations in a prescribed frequency range; comparing the level of engine vibrations in said prescribed frequency range with a prescribed reference level; determining the misfiring is occurring when the level of engine vibrations is said prescribed frequency range exceeds the prescribed reference level; and electronically identifying which cylinder of the engine is misfiring. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification