System and method to pre-ignition in an internal combustion...

Details System and method to pre-ignition in an internal combustion... System and method to pre-ignition in an internal combustion...

2007-02-20

2007-02-20

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Combustion chamber means having fuel injection only

Injecting diverse fuels or different states of same fuel

C123S431000

Reexamination Certificate

active

11216978

ABSTRACT:
An engine system and method are disclosed for controlling pre-ignition of an alcohol fuel. In one embodiment, the fuel injection timing is adjusted to cause the fuel to avoid combustion chamber surfaces. In another embodiment, the fuel injection timing is adjusted to spray the fuel directly onto the piston surface to cool the piston. Also disclosed is a cylinder cleaning cycle in which engine knock is purposely caused for one to hundreds of engine cycles by adjusting the fuel content away from alcohol toward gasoline. Further measures to cause knock which are disclosed: adjusting spark timing, intake boost, exhaust gas fraction in the cylinder, cam timing, and transmission gear ratio.

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Inoue, K., Takei, K., Yoshida, K, shoji, H., and Yamazaki A., “Effect of EGR-Induced Hot Residual Gas on Combustion When Operating a Two-Stroke Engine on Alcohol Fuels,” SAE Paper 2000-01-2972, 2000.

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