Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1989-07-14
1990-10-16
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Fuel injection system
F02D 4114, F02D 4136
Patent
active
049627414
ABSTRACT:
An air/fuel ratio control system and method for correcting the air/fuel ratio for each of N cylinders in an internal combustion engine having electronically actuated fuel injectors coupled to each cylinder. A first air/fuel controller provides a desired fuel command for maintaining an average air/fuel ratio among the cylinders in response to an exhaust gas oxygen sensor and a measurement of inducted air flow. A second air/fuel controller generates N trim signals by sampling the exhaust gas oxygen sensor once each combustion period, synchronizing the samples to generate N nonperiodic samples, correlating the samples with the corresponding combustion event and integrating. The fuel command to each fuel injector is then trimmed for operating each cylinder at a desired air/fuel ratio.
REFERENCES:
patent: 4111171 (1978-09-01), Aono et al.
patent: 4337745 (1982-07-01), Pomerantz
patent: 4483300 (1984-11-01), Hosaka et al.
patent: 4627402 (1986-12-01), Saito et al.
patent: 4718015 (1988-01-01), Grob et al.
patent: 4766870 (1988-08-01), Nakajima et al.
Publication FA2-10:00 from Proceedings of the 1987 American Control Conference, Minneapolis, Minnesota, 10-12 Jun. 1987, entitled "Modeling and Analysis of an Inherently Multi-Rate Sampling Fuel Injected Engine Idle Speed Control Loop", by B. K. Power, J. A. Cook, J. W. Grizzle.
Cook Jeffrey A.
Grizzle Jessy
Abolins Peter
Dolinar Andrew M.
Ford Motor Company
Lippa Allan J.
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