Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1998-10-02
2000-09-05
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
12356822, 12356826, F02M 2507
Patent
active
061127299
ABSTRACT:
The present invention is an apparatus for controlling exhaust gas recirculation in an internal combustion engine. The apparatus includes an exhaust gas recirculation controller that uses sensed engine operating parameters and the engine operational mode to determine whether to enable or disable the exhaust gas recirculation valve. When the valve is enabled, a closed-loop controller determines the desired amount of exhaust gas to recirculate and the corresponding position of the exhaust gas recirculation valve to introduce the desired amount of exhaust gas into the engine's air intake manifold. The desired valve position is converted to a current signal which is transmitted to an actuator to move the valve. When the valve is disabled, the current signal is set to a value to close the valve to prevent exhaust gas from being circulated in the engine's air intake manifold.
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Barnes Travis E.
Lukich Michael S.
Nicholson Scott E.
Caterpillar Inc.
Wolfe Willis R.
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