Air-fuel ratio computing apparatus

Details Air-fuel ratio computing apparatus Air-fuel ratio computing apparatus

2005-07-05

2005-07-05

Bui, Bryan (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Chemical analysis

C123S688000

Reexamination Certificate

active

06915213

ABSTRACT:
The air-fuel ratio computing apparatus includes a linear air-fuel ratio sensor for measuring an air-fuel ratio of exhaust gas and an electronic control unit for repeatedly performing filter processing on the air-fuel ratio, using a formulain-line-formulae description="In-line Formulae" end="lead"?Vf(n)=(1−G)×Vf(n−1)+G×V(n).in-line-formulae description="In-line Formulae" end="tail"?In a case where a temperature of the sensor is low, the unit cuts off a pump current to the sensor, performs the filter processing with the filter gain G set to a large value, and transforms a computed value from the filter processing into a theoretical air-fuel ratio voltage and in a case where the temperature of the sensor rises to or above a predetermined temperature, the unit performs the filter processing with a filter gain G set to a small value, and computes an air-fuel ratio from the difference between a computed value from the filter processing and the theoretical air-fuel ratio voltage.

REFERENCES:
patent: 4951632 (1990-08-01), Yakuwa et al.
patent: 5392598 (1995-02-01), White et al.
patent: 6089016 (2000-07-01), Takaku
patent: 6210641 (2001-04-01), Yamada et al.
patent: 6830043 (2004-12-01), Morinaga et al.
patent: 2001/0000956 (2001-05-01), Honda et al.
patent: 2004/0025856 (2004-02-01), Iida et al.
patent: 2004/0249556 (2004-12-01), Makki et al.
patent: 2001-221095 (2001-08-01), None

Affiliated with

Also associated with

Rating

Air-fuel ratio computing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Air-fuel ratio computing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Air-fuel ratio computing apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3385349