Cylinder pressure based air-fuel ratio and engine control

Details Cylinder pressure based air-fuel ratio and engine control Cylinder pressure based air-fuel ratio and engine control

1998-03-20

1999-03-09

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including cylinder pressure or temperature responsive means

12356811, 123676, 123479, 701108, F02D 4100, F02M 700

Patent

active

058787178

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.

REFERENCES:
patent: 4327688 (1982-05-01), Lowther
patent: 4621603 (1986-11-01), Matekunas
patent: 4622939 (1986-11-01), Matekunas
patent: 4624229 (1986-11-01), Matekunas
patent: 4694799 (1987-09-01), Yagi et al.
patent: 4736724 (1988-04-01), Hamburg et al.
patent: 4896642 (1990-01-01), Washino et al.
patent: 4903665 (1990-02-01), Washino et al.
patent: 4971009 (1990-11-01), Washino et al.
patent: 4996960 (1991-03-01), Nishiyama et al.
patent: 5038737 (1991-08-01), Nishiyama et al.
patent: 5067463 (1991-11-01), Remboski et al.
patent: 5107813 (1992-04-01), Inoue et al.
patent: 5245969 (1993-09-01), Nishiyama et al.
patent: 5359975 (1994-11-01), Katashiba et al.
patent: 5361745 (1994-11-01), Suzuki et al.
patent: 5474045 (1995-12-01), Demizu et al.
patent: 5592919 (1997-01-01), Morikawa
patent: 5632257 (1997-05-01), Machida et al.
patent: 5636614 (1997-06-01), Morikawa
patent: 5703285 (1997-12-01), Shimizu et al.
patent: 5765532 (1998-06-01), Loye

Affiliated with

Also associated with

Rating

Cylinder pressure based air-fuel ratio and engine control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cylinder pressure based air-fuel ratio and engine control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cylinder pressure based air-fuel ratio and engine control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1311536