Measuring and testing – Simulating operating condition – Marine
Patent
1995-06-30
1997-04-15
Chilcot, Richard
Measuring and testing
Simulating operating condition
Marine
123571, G01M 1500
Patent
active
056211678
ABSTRACT:
Internal combustion engine exhaust gas recirculation (EGR) system diagnostics provides for intrusive analysis of the performance of the EGR system in two phases which are alternately activated while the engine is in a stable, hot idle operating region. A first phase approximates EGR system performance through an abbreviated opening of an EGR valve to permit a limited amount of EGR pass to an engine intake air passage so that limited measurement of the effect of the EGR on intake air passage pressure may be made with minimum disruption of engine performance and emissions control performance. If the first phase indicates a potential EGR system problem, the second phase is activated and the first phase is deactivated. The second phase confirms or refutes the results of the phase one analysis through a prolonged opening of the EGR valve so that sufficient exhaust gas may pass into the engine intake air passage to permit analysis of the disruption of the intake air passage pressure to reliably diagnose EGR system performance.
REFERENCES:
patent: 4173205 (1979-11-01), Toelle
patent: 4373497 (1983-02-01), Hamren
patent: 4671107 (1987-06-01), Chiesa et al.
patent: 4719893 (1988-01-01), Buslepp et al.
patent: 5014203 (1991-05-01), Miyazaki et al.
patent: 5207093 (1993-05-01), Maeda
patent: 5257610 (1993-11-01), Ohuchi
patent: 5309887 (1994-05-01), Kondo et al.
patent: 5341300 (1994-08-01), Fujimoto
patent: 5474051 (1995-12-01), Matsumoto et al.
patent: 5488938 (1996-02-01), Ohuchi
patent: 5503129 (1996-04-01), Robichaux et al.
patent: 5513616 (1996-05-01), Matsumoto et al.
Document Number 08/265,092 Date filed 24 Jun. 94 Name Wade.
Bridges Michael J.
Chilcot Richard
General Motors Corporation
McCall Eric S.
LandOfFree
Exhaust gas recirculation system diagnostic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Exhaust gas recirculation system diagnostic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exhaust gas recirculation system diagnostic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-362343