Internal combustion engine with dilution reduction in response to surge detection
A dilution control for an internal combustion engine having combustion chambers in which fuel charges are ignited in a predetermined order, a rotating crankshaft and a dilution control mechanism controllable to vary the dilution gas content of the fuel charge according to a predetermined schedule is described comprising in combination: first means effective to detect the time duration of a constant predetermined crankshaft rotational angle during the period of crankshaft deceleration before top dead center (BTDC) for each consecutively ignited combustion chamber; second means effective to update an average time duration with selected periodic time durations detected by the first means; third means effective to compute the difference between selected periodic time durations detected by the first means and the average time duration; fourth means effective to detect zero crossings of successive differences as computed by the third means and derive therefrom the period and therefore the frequency of the zero crossings; fifth means effective to compute and store each new maximum value of the difference as computed by the third means between zero crossings as detected by the fourth means and thereby detect the maximum value of the differences between the zero crossings; sixth means effective, for selected periodic zero crossings, to generate a surge signal if the period of the zero crossing as derived by the fourth means corresponds to a predetermined frequency range of substantially 2 to 10 Hz and if the maximum difference as detected by the fifth means is greater than a predetermined reference; and seventh means effective to decrease dilution from the predetermined schedule in response to the surge signal and allow dilution to return to the predetermined schedule in the absence of the surge signal.
- Assignee:
- General Motors Corp., Detroit, MI
- Patent Number(s):
- US 4724813
- OSTI ID:
- 5034734
- Resource Relation:
- Patent File Date: Filed date 10 Mar 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
FUEL INJECTION SYSTEMS
COMPUTERIZED CONTROL SYSTEMS
INTERNAL COMBUSTION ENGINES
IGNITION
COMBUSTION CHAMBERS
DILUTION
OPERATION
RESPONSE FUNCTIONS
CONTROL SYSTEMS
ENGINES
FUEL SYSTEMS
FUNCTIONS
HEAT ENGINES
330100* - Internal Combustion Engines
990220 - Computers
Computerized Models
& Computer Programs- (1987-1989)