Engine dilution control by combustion pressure harmonic amplitude ratio
A charge dilution control for an internal combustion engine is described including a combustion chamber, means effective to ignite a combustible charge in the combustion chamber and apparatus effective to control the admission of dilution gases to the combustible charge. The charge dilution control comprises, in combination: pressure sensing means effective to sense the pressure in 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 at least two 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 proportional to the firing frequency of the engine as the rotational speed of the crankshaft changes; means effective to detect the relative peak amplitudes of corresponding peaks in the two predetermined harmonic signals and determine the ratio thereof; and means effective to vary the dilution control apparatus to maintain the ratio at or below a predetermined level in closed loop operation.
- Assignee:
- General Motors Corp., Detroit, MI
- Patent Number(s):
- US 4699107
- OSTI ID:
- 5854129
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330100* -- Internal Combustion Engines
COMBUSTION CHAMBERS
CONTROL
CONTROL SYSTEMS
DESIGN
ENGINES
FREQUENCY CONTROL
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
HEAT ENGINES
IGNITION
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
MONITORS
OPERATION
PRESSURE CONTROL