Mark A Borland

US Patent:

57352461, Apr 7, 1998

Filed:

Sep 30, 1996

Appl. No.:

8/723400

Inventors:

Michael T. Vincent - Novi MI
Mark S. Borland - Birmingham MI
Kim A. Morehouse - Stockbridge MI
James R. Tamm - Ann Arbor MI

Assignee:

Chrysler Corporation - Auburn Hills MI

International Classification:

F02D 4114

US Classification:

123436

Abstract:

A system is provided for controlling the ratio of fuel to air in an internal combustion engine to protect the catalyst substrate of a catalytic convertor from thermal damage. The system comprises detecting a misfire rate and adjusting the amount of fuel within the system accordingly. More particularly, the detected misfire rate is compared to at least one predetermined misfire rate within the engine control unit. If the detected misfire rate is not equal to the predetermined rate, the ratio of fuel to air is changed a calibrated amount. Accordingly, when the misfire rate exceeds a predetermined rate, additional fuel is added to the system. By increasing the ratio of fuel to air, the oxidation reaction is reduced and the exothermic activity within the catalytic converter is lowered.

US Patent:

55424031, Aug 6, 1996

Filed:

Nov 18, 1994

Appl. No.:

8/342297

Inventors:

Mark S. Borland - Birmingham MI
Bruce H. Teague - Grosse Pointe Park MI

Assignee:

Chrysler Corporation - Highland Park MI

International Classification:

F02D 4114

US Classification:

123686

Abstract:

A method of determining start of closed-loop fuel control for an internal combustion engine including the steps of determining a base fuel pulsewidth threshold, ascertaining whether a current accumulated base fuel pulsewidth is greater than or equal to the base fuel pulsewidth threshold, updating the current accumulated base fuel pulsewidth with a value of a previous accumulated base fuel pulsewidth plus the current base fuel pulsewidth if the current accumulated base fuel pulsewidth is not greater than or equal to the base fuel pulsewidth threshold, and beginning a closed loop fuel control of a plurality of fuel transferring components if the current accumulated base fuel pulsewidth is greater than or equal to the base fuel pulsewidth threshold.