METHOD AND SYSTEM FOR CONTROLLING FUEL USAGE
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United States of America Patent
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app pub date -
Oct 8, 2013
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Jul 29, 2010
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Methods and systems are provided for improving fuel usage while addressing knock by adjusting the use of spark retard and direct injection of a knock control fluid based on engine operating conditions and the composition of the injected fluid. One or more engine parameters, such as EGR, VCT, boost, throttle position, and CMCV, are coordinated with the direct injection to reduce torque and EGR transients.
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