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초록· 키워드

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The electromechanical valve train (EMV) technology allows for a reduction in fuel consumption while operating under a stoichiometric air~fuel~ratio and preserves the ability to use conventional exhaust gas aftertreatment technology with a 3-way-catalyst. Compared with an engine with a camshaft-driven valve train. the variable valve timing concept makes possible an additional optimization of cold start, warm-up and transient operation. In contrast with the conventionally throttled engine. optimized control of load and in-cylinder gas movement can be used for each individual cylinder and engine cycle. A load control strategy using a "Late Intake Valve Open" (LIO) provides a reduction in start-up HC emissions of approximately 60%. Due to reduced wall-wetting. the LIO control strategy improves the transition from start to idle. "Late Exhaust Valve Open" (LEO) timing during the exhaust stroke leads to exhaust gas atierburning and. thereby. results in high exhaust gas temperatures and low HC emissions. Vehicle investigations have demonstrated an improved accuracy of the air-fuel-ratio during transient operation. Results in the New European Driving Cycle have confirmed a reduction in fuel consumption of more than 15%, while meeting EURO IV emission limits.

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ABSTRACT

1.INTRODUCTION

2.CONCEPT FOR ELECTRONIC CONTROL OF A VEHICLE POWERTRAIN

3.PROCESS CONTROL FOR AN SI-ENGINE WITH A VARIABLE VALVE TRAIN

4.LOAD CONTROL STRATEGIES

5.CONTROL OF LOAD COMPOSITION

6.CONTROL OF IN-CYLINDER GAS MOTION

7.VALVE TIMING“EXHAUST OPEN“

8.COLD START AND WARM-UP BEHAVIOR OF AN ENGINE WITH A VARIABLE VALVE TRAIN

9.WARM-UP BEHAVIOR

10.VEHICLE TEST RESULTS

11.OUTLOOK

12.CONCLUSIONS

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UCI(KEPA) : I410-ECN-0101-2009-556-013996694