Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Reexamination Certificate
2006-11-28
2006-11-28
Wolfe, Jr., Willis R. (Department: 3747)
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
C123S568160, C123S568210, C701S108000
Reexamination Certificate
active
07140360
ABSTRACT:
A system for controlling the air-to-fuel ratio in an internal combustion engine includes an air intake conduit coupled to an intake manifold, an EGR valve disposed in-line with an EGR conduit responsive to a valve control signal, a lambda sensor producing a lambda signal indicative of the air-to-fuel ratio of the exhaust gas and a control circuit producing the valve control signal as a function of a desired mass air flow value, a desired air-to-fuel ratio, and the lambda signal. In an alternate embodiment, the system further includes a fueling system responsive to a fueling control signal. In this embodiment, the control circuit produces the fueling control signal as a function of a desired fuel control value, a desired air-to-fuel ratio, and the lambda signal. In another alternate embodiment, the control circuit produces the valve control signal as a function of a desired air-to-fuel ratio and the lambda signal.
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Li Jian Wen
Wang Yue Yun
Barnes & ThornburgLLP
Cummins Inc.
Wolfe, Jr. Willis R.
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