Engine ignition timing with knock control by combustion pressure harmonic amplitude ratio
An ignition timing control is described for an internal combustion engine including a combustion chamber, means effective to ignite a combustible charge in the combustion chamber and power output apparatus including a rotating crankshaft driven in response to the expansion of the ignited combustible charge. The ignition timing control consists of: means effective to define a normal ignition timing for the engine in the absence of knock; pressure sensing means effective to sense the combustion chamber and generate a combustion pressure signal therefrom; means effective to sense the rotational speed of the crankshaft; frequency selective filter means for generating a plurality of predetermined harmonic signals of the combustion pressure signal, the frequency selective filter means being responsive to the last means to maintain the frequencies of the harmonic signals at whole number multiples of the firing frequency of the engine as the rotational speed of the crankshaft changes.
- Assignee:
- General Motors Corp., Detroit, MI
- Patent Number(s):
- US 4846130
- OSTI ID:
- 5685446
- Resource Relation:
- Patent File Date: 5 Jul 1988
- Country of Publication:
- United States
- Language:
- English
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