Method and system for reducing engine knock in an internal combustion engine
An antiknock system for an internal combustion engine having a fuel system and a spark ignition system is described, said antiknock system comprising: means for detecting engine vibration and for generating a vibration output signal representative of the magnitude of the engine vibration over a predetermined frequency spectrum, means for integrating said vibration output signal over said frequency spectrum multiplied by a first weight factor to obtain a first value, means for integrating said vibration output signal over frequency spectrum multiplied by a second weight factor to obtain a second value, wherein said first weight factor has a greater average value in a first frequency range of said frequency spectrum than said second weight factor while said second weight factor has a greater average value in a second frequency range of said frequency spectrum than said first weight factor, means for comparing said first value with a first threshold value and generating a fuel control output signal when said first value exceeds said first threshold, means for comparing said second value with a second threshold value and generating a spark ignition control output signal when said second value exceeds said second threshold, means for varying the rate of fuel delivery by the fuel system as a function of said fuel control output signal, and means for varying ignition timing of the spark ignition system as a function of said spark ignition control output signal.
- Assignee:
- Hitachi America, Ltd., Tarrytown, NY (United States)
- Patent Number(s):
- US 5215059; A
- Application Number:
- PPN: US 7-863088
- OSTI ID:
- 6495166
- Resource Relation:
- Patent File Date: 3 Apr 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
INTERNAL COMBUSTION ENGINES
DESIGN
KNOCK CONTROL
COMBUSTION
FUEL-AIR RATIO
MECHANICAL VIBRATIONS
CHEMICAL REACTIONS
CONTROL
ENGINES
HEAT ENGINES
OXIDATION
THERMOCHEMICAL PROCESSES
330101* - Internal Combustion Engines- Spark-Ignition
330603 - Vehicle Design Factors- Engine System