Internal combustion engine with dilution reduction in response t

Details Internal combustion engine with dilution reduction in response t Internal combustion engine with dilution reduction in response t

1987-03-10

1988-02-16

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

36443108, F02D 4126

Patent

active

047248130

ABSTRACT:
A control decreases dilution (EGR) in an internal combustion engine from a schedule if surge is detected and allows it to return to the schedule in the absence of surge. Surge is detected by timing a predetermined crank angle of 70-10 degrees BTDC, an angle including only crank deceleration, for consecutive engine firings, updating an average time therewith and computing the difference between the new time and the average. The successive differences are examined for zero crossings and compared to a stored maximum difference. If difference exceeds the maximum it becomes the new maximum difference. If a zero crossing is detected, the time since the last zero crossing is calculated to determine if the difference variations have a frequency of 2-10 Hz. If so, and the maximum difference exceeds a reference, a surge signal is generated.

REFERENCES:
patent: 3789816 (1974-02-01), Taplin
patent: 4197767 (1980-04-01), Leung
patent: 4323042 (1982-04-01), Woodhouse et al.
patent: 4337647 (1982-07-01), Radcliffe et al.
patent: 4344140 (1982-08-01), Leung
patent: 4380800 (1983-04-01), Wilkinson
patent: 4509484 (1985-04-01), Gertiser
patent: 4527523 (1985-07-01), Daumer et al.
patent: 4616617 (1986-10-01), Geiger et al.

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