首页|DEVELOPMENT OF PROTOTYPAL ENGINE MANAGEMENTSYSTEM FOR A VVT ENGINE
DEVELOPMENT OF PROTOTYPAL ENGINE MANAGEMENTSYSTEM FOR A VVT ENGINE
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
The modern automotive requirements are very stringent in particular in termsof emissions (in order to guarantee the respect to emissions legislation) and fuel consumption.Sometimes in order to satisfy these hard requirements, mechanical modifications must beintroduced. The EVO Engine is a traditional speed density engine with a Variable ValveTiming (VVT) system. This system has the capability to vary the valve timing and so thepercentage of Exhaust Gas Re-circulation (EGR), in order to maximize the performance or tominimize the fuel consumption. In a torque-based architecture, from the control point of view,the presence of VVT introduces a further degree of freedom for the torque actuation. Theintroduction of VVT has an impact on a lot of parts of control. The greatest influence is on airmass flow estimation (direct and inverse model), spark advance calculation and torqueestimation.The air mass flow estimated (in function of manifold pressure, engine speed, temperaturesand ambient pressure) must be corrected to take into account the current EGR.The spark advance calculation must be modified to introduce the dependence on the VVTposition: a greater EGR amount makes the combustion slower.A different VVT position modifies the pumping torque and so the torque losses.So it has been necessary to introduce heavy modifications on Engine Control Unit to manageefficiently the capability coming from the presence of this component. In order to validate thecontrol solutions directly on the system a prototypal control has been implemented with thebypass techniques. So starting from the normal production ECU a functional bypass has beenimplemented for the interested parts of control on a Rapid Control Prototyping system.The prototypal control has been validated first in a PC simulation with the engine model(Software In the Loop), then with the ECU hardware on the EVO 2 engine model (HardwareIn the Loop) and finally on the engine in an engine test-bench.The results of the validation phases that demonstrate the effectiveness of the designed controlare presented.
VVTEngine Control SystemPrototypingEGREVO
De Cristofaro、Ferdinando、Cioffi、Vittorio、Scala、Stefano、Russo、Antonio
NETL
