Fuel controller with oxygen sensor monitoring and offset correct

Details Fuel controller with oxygen sensor monitoring and offset correct Fuel controller with oxygen sensor monitoring and offset correct

1993-10-04

1994-12-06

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123696, F02D 4114

Patent

active

053701011

ABSTRACT:
A fuel control system operating under closed-loop control senses the oxygen content of the combustion products of an internal combustion engine along with the engine angular velocity and air flow through the intake manifold. The fuel control system supplies an air/fuel modulation signal to modify a fueling value which is calculated as a function of the engine angular velocity and air flow. An oxygen sensor monitoring test is performed periodically to determine the efficacy of the oxygen sensor. The total switching time of the oxygen sensor, comprising the lean-to-rich and rich-to-lean switching times, is determined and checked against a range. If the total switching time is within the range then the difference between the lean-to-rich and rich-to-lean switching times, is determined and checked against a second range. If the difference is within the second range the oxygen sensor is determined to be operating effectively and the test is terminated. If the difference is outside of the second range, a compensation value is generated as a function of the difference in switching times. The monitoring test is performed a predetermined number of times and if at the end of the test the difference in switching times is still outside of the second range, the oxygen sensor is determined to be inoperative.

REFERENCES:
patent: 4624232 (1986-11-01), Saito et al.
patent: 4938194 (1990-07-01), Kato et al.
patent: 5052361 (1991-10-01), Ono et al.
patent: 5065728 (1991-11-01), Nakaniwa
patent: 5237983 (1993-08-01), Willey et al.
patent: 5247793 (1993-09-01), Yamada et al.

Affiliated with

Also associated with

Rating

Fuel controller with oxygen sensor monitoring and offset correct does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fuel controller with oxygen sensor monitoring and offset correct, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel controller with oxygen sensor monitoring and offset correct will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-207707