Measuring and testing – Gas analysis – With compensation detail
Reexamination Certificate
2005-03-22
2005-03-22
Warden, Jill (Department: 1743)
Measuring and testing
Gas analysis
With compensation detail
C073S001010, C073S001020, C073S023360, C073S023200, C073S023320, C422S083000, C422S098000, C436S143000
Reexamination Certificate
active
06868712
ABSTRACT:
An A/F signal proportional to an oxygen concentration in the exhaust gas from an internal combustion engine is output upon application of a voltage based on an instruction from a microcomputer. At the time an element resistance is detected, a bias instruction signal Vr from the microcomputer is converted by a D/A converter21to an analog signal Vb. An output voltage Vc obtained by removing high frequency components from the analog signal Vb through an LPF22is input to a bias control circuit40. During this time period in which the element resistance is detected, an accurate A/F signal is not output. Therefore, the A/F signal that has theretofore prevailed is held by a Sample/Hold circuit70to thereby prevent the use of an erroneous A/F signal. Namely, at the time of detecting the element resistance, the detected value of the oxygen concentration is prevented from becoming abnormal. As a result, an accurate A/F control can be executed using the detected element resistance.
REFERENCES:
patent: 4385611 (1983-05-01), Harper et al.
patent: 4419190 (1983-12-01), Dietz et al.
patent: 4543176 (1985-09-01), Harada et al.
patent: 5245979 (1993-09-01), Pursifull et al.
patent: 5781878 (1998-07-01), Mizoguchi et al.
patent: 6083370 (2000-07-01), Kato et al.
patent: 6120677 (2000-09-01), Yamada
patent: 6656337 (2003-12-01), Kurokawa et al.
patent: A 4-24657 (1992-04-01), None
Hada Satoshi
Haseda Satoshi
Kawase Tomoo
Kurokawa Eiichi
Suzuki Toshiyuki
Denso Corporation
Nixon & Vanderhye PC
Sines Brian
Warden Jill
LandOfFree
Control method for gas concentration sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control method for gas concentration sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control method for gas concentration sensor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3391950