Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Reissue Patent
2007-12-11
2007-12-11
Wolfe, Jr., Willis R. (Department: 3747)
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
C123S568210, C123S568220
Reissue Patent
active
10180458
ABSTRACT:
Past exhaust emission control systems have failed to cool the exhaust gas prior to mixing with the intake air. The present exhaust gas recirculation system cools a flow of exhaust gas with a common coolant being used to cool an engine prior to mixing the flow of exhaust gas with a flow of intake air. The present exhaust gas recirculation system includes a control system for monitoring an operating parameter of an engine. The control system interprets a signal sensing the operating parameter within a controller and the controller causes an exhaust valve regulator to move between an open position and a closed position. Additionally, a plurality of paths or maps, for example, one being a normal coolant temperature strategy and another being a high coolant temperature strategy is used. In the normal coolant temperature strategy, with the exhaust valve regulator in the open position the supply of fuel to the engine would be advanced. And, in the high coolant temperature strategy, with the exhaust valve regulator in the closed position the supply of fuel to the engine would be retarded. Thus, the emissions emitted from the engine are maintained within a preestablished parameter.
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Caterpillar Inc.
Finnegan Henderson Farabow Garrett & Dunner
Wolfe, Jr. Willis R.
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