Importance

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Abstract

Engine includes an air induction sub-system for delivery of air to each cylinder. A lowpressure fuel injector injects a low reactivity fuel into the sub-system. An exhaust gas recirculation line connects exhaust gas purged from the cylinders back to the sub-system. An exhaust gas cooler cools recirculated gas in the exhaust gas recirculation line. The quantity of exhaust gas recirculated is controlled and the recirculated gas provides dilution and temperature control of the charge to suppress auto-ignition of the charge in the cylinder. A high pressure fuel injector injects a high reactivity fuel in the compression stroke for auto ignition and to initiate combustion of the charge. A variable valve actuator controls compression ratio and cylinder peak temperature. Boost is provided in air induction sub-system to assure combustion to stoichiometric levels.

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First Claim