Model-Based Optimal Calibration of a Dual Independent Variable Valve-Timing Engine
نویسندگان
چکیده
Modern engines have an increasing number of control parameters that are having a dramatic impact on calibration time. Up-front prototyping of calibration processes can be used to reduce the burden of increasing powertrain complexity, however, such techniques are still in their infancy in the automotive field. In this paper we illustrate how flexible model-based calibration tools can be used to prototype a calibration process for an advanced engine type. Specifically, we produce optimal calibration tables for intake and exhaust cam timings that trade off brake specific fuel consumption against NOx emissions. The data used is from a GT-Power model of a production 2.2L naturally aspirated 4-valve overhead-cam spark ignition engine, modified for twin-independent variable valve-timing capability. All analysis techniques used are available in version 2.0 of the Model-Based Calibration Toolbox.
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