Internal-combustion engines – Charge forming device – Including cylinder pressure or temperature responsive means
Patent
1996-12-27
1998-06-16
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including cylinder pressure or temperature responsive means
123479, 123571, 701104, F02M 700
Patent
active
057655324
ABSTRACT:
A system and method for controlling an air-fuel ratio of an internal combustion engine using a ratio of cylinder pressures measured within at least one cylinder. The air-fuel ratio control system includes an electronic control module (ECM) which computes a measured cylinder pressure ratio of the cylinder pressure measured at a predetermined crank angle before top dead center and the cylinder pressure measured at a predetermined crank angle after top dead center. The measured cylinder pressure ratio is compared with an optimal cylinder pressure ratio. Based upon the results of this comparison, the ECM then determines an adjusted air-fuel ratio which would modify the measured pressure ratio to equal the optimal pressure ratio. This system controls the air-fuel ratio by measuring the quality of combustion without the need to measure the amount of air or fuel actually delivered to the engine. The measured pressure ratio corresponds to an excess air ratio of the internal combustion engine at those operating conditions, wherein a measured excess air ratio of the engine may be obtained from the computed pressure ratio. The measured excess air ratio may be compared with an optimal excess air ratio for the specific engine operating conditions currently being sensed, wherein the ECM then determines the adjusted air-fuel ratio which would modify the measured excess air ratio to equal the stored optimal excess air ratio.
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Argenbright Tony M.
Cummins Engine Company, Inc.
Leedom Jr. Charles M.
Smith Leonard
Vo Hieu T.
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