Measuring and testing – Simulating operating condition – Marine
Patent
1994-01-27
1995-04-25
Chilcot, Jr., Richard E.
Measuring and testing
Simulating operating condition
Marine
731182, 123339, G01M 1900
Patent
active
054088712
ABSTRACT:
An idle air control system diagnostic for an internal combustion engine which utilizes RPM, engine timing and intake airflow measurements to detect the presence of idle RPM faults and eliminate or verify the idle air control system as the fault source. Engine idle RPM is measured and compared with a commanded idle RPM, and if within a predetermined range, an idle RPM fault exists and one of two additional tests (non-intrusive and intrusive) is conducted to determine whether the idle air control system is the source of the fault. In the non-intrusive test, intake airflow is measured and compared to a predetermined intake airflow value, and if not within a predetermined range, the idle air control system is determined to be the fault source. In the intrusive test, variations in intake airflow (or intake manifold pressure) are measured in response to variations in the movement of the engine throttle-bypass airway pintle. If no intake airflow variations are detected, the idle air control system is determined to be the fault source.
REFERENCES:
patent: 4742807 (1988-05-01), Sakamoto et al.
patent: 4794790 (1989-01-01), Margarit-Metaxa et al.
patent: 4875456 (1989-10-01), Tomisawa
patent: 4903526 (1990-02-01), Miyama et al.
patent: 4955341 (1990-09-01), Trombley et al.
patent: 4989564 (1991-02-01), Cook et al.
patent: 5018383 (1991-05-01), Togai et al.
patent: 5036812 (1991-08-01), Fukui et al.
patent: 5065718 (1991-11-01), Suzuki et al.
patent: 5113347 (1992-05-01), Ohuchi et al.
patent: 5124919 (1992-06-01), Kastelle
patent: 5138874 (1992-08-01), Davis
patent: 5269272 (1993-12-01), Nakaniwa
Bell Myron H.
Labus Gregory E.
Lieder Franz A.
Matteson Stephen D.
Nichols Gary A.
Chilcot Jr. Richard E.
General Motors Corporation
Gorbatoff Timothy G.
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