EGR-VNT cooperative control of diesel engine based on ILQ design

Abstract

The development of a clean and fuel efficient diesel engine control method is required for the purpose of global environmental protection. However, in the EGR control of turbo-charged engines, the system has nonlinear characteristics, and there is mutual interference between the EGR valve and the VNT guide vane. We propose a cooperative control method to deal with the nonlinearity of the diesel engine. In this paper, a method for model identification and ILQ (Inverse Linear Quadratic) design is introduced. As the result of using this method, which can be systemized from model identification to the mapping of the controller gain, high environmental performance and efficiency are achieved. © 2012 The Japan Society of Mechanical Engineers.