Method for detecting crankshaft oscillations
First Claim
1. A method for detecting oscillations of a crankshaft of an internal combustion engine, which comprises:
- determining if an engine is within a predetermined rpm range;
ascertaining an amplitude of a crankshaft vibration if the engine is within the predetermined rpm range;
determining if the amplitude is greater than a limit value;
ascertaining a frequency of the crankshaft vibration if the amplitude is greater than the limit value;
determining if the frequency is within a predetermined frequency range; and
ascertaining an oscillation of the crankshaft and suppressing for a predeterminable period of time a process for detecting combustion misfires by evaluating fluctuations in the crankshaft speed, if the frequency is within the predetermined frequency range.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for detecting oscillations of a crankshaft of an internal combustion engine includes determining if an engine is within a predetermined rpm range. An amplitude of a crankshaft vibration is ascertained if the engine is within the predetermined rpm range. A determination is made as to whether or not the amplitude is greater than a limit value. A frequency of the crankshaft vibration is ascertained if the amplitude is greater than the limit value. A determination is made as to whether or not the frequency is within a predetermined frequency range. An oscillation of the crankshaft is ascertained and a process for detecting combustion misfires by evaluating fluctuations in the crankshaft speed is suppressed for a predeterminable period of time, if the frequency is within the predetermined frequency range.
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Citations
8 Claims
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1. A method for detecting oscillations of a crankshaft of an internal combustion engine, which comprises:
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determining if an engine is within a predetermined rpm range; ascertaining an amplitude of a crankshaft vibration if the engine is within the predetermined rpm range; determining if the amplitude is greater than a limit value; ascertaining a frequency of the crankshaft vibration if the amplitude is greater than the limit value; determining if the frequency is within a predetermined frequency range; and ascertaining an oscillation of the crankshaft and suppressing for a predeterminable period of time a process for detecting combustion misfires by evaluating fluctuations in the crankshaft speed, if the frequency is within the predetermined frequency range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification