Method for recognizing abnormal combustions in the cylinder of an internal-combustion engine
First Claim
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1. A method for recognizing abnormal combustions in a cylinder of an internal-combustion engine, comprising the steps of:
- determining a speed of the internal-combustion engine at two crankshaft positions which are different depending upon load and on speed, said two crankshaft positions defining a speed difference of the speed of the internal combustion engine at the two positions,selecting said two crankshaft positions so that, in relation to abnormal combustion, as great a speed difference as possible is obtained, andrecognizing abnormal combustion when, according to a speed difference corresponding to said two crankshaft positions selected in said selecting step, a chronologically later minus chronologically earlier rpm value or chronologically earlier minus chronologically later rpm value traverses a limit value.
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Abstract
The speed for each cylinder is determined by means of two crankshaft positions z1, z2. The crankshaft positions z1, z2 are optimized in terms of the case of abnormal combustion. Abnormal combustion is recognized when, according to the selected definition of the speed difference ΔT, a limit value GW is not reached or is exceeded.
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5 Claims
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1. A method for recognizing abnormal combustions in a cylinder of an internal-combustion engine, comprising the steps of:
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determining a speed of the internal-combustion engine at two crankshaft positions which are different depending upon load and on speed, said two crankshaft positions defining a speed difference of the speed of the internal combustion engine at the two positions, selecting said two crankshaft positions so that, in relation to abnormal combustion, as great a speed difference as possible is obtained, and recognizing abnormal combustion when, according to a speed difference corresponding to said two crankshaft positions selected in said selecting step, a chronologically later minus chronologically earlier rpm value or chronologically earlier minus chronologically later rpm value traverses a limit value. - View Dependent Claims (2, 3, 4, 5)
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Specification