Wastegate Actuator Modeling and Tuning of a PID Controller for Boost Pressure Control
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
In some turbochargers, boost pressure is reduced by opening the wastegate valve. In a modern turbo charged car, the most common way for opening the wastegate is with a pneumatic actuator and an air control solenoid, controlled by the ECU. In the control systems studied the ECU utilizes a static feedforward and a PID controller, for the purpose of making the boost pressure follow its reference value. With no systematic method for tuning the controller, this can be time consuming, and a set of well defined experiments to determine PID parameters are desired.When test time in a real engine is limited or expensive, it is advantageousto work in a simulation environment before doing live tests. A model for thewastegate actuator and air control solenoid is developed in the thesis. This is used to simulate controller performance before any tests in a real car is performed.In the thesis a tuning method for the PID controller based on step responsesis proposed. The tuning method evaluated is the IMC-choice of controller fora second order system, and it has a single design parameter not given by theexperiments. The controller is shown to give desired behavior when the staticfeedforward is correct or has small error.
Place, publisher, year, edition, pages
2009. , 51 p.
PID, Wastegate, Boost Control, Turbo Charging
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-17207ISRN: LiTH-ISY-EX--09/4232--SEOAI: oai:DiVA.org:liu-17207DiVA: diva2:210441
Subject / course
Leufvén, Oskar, Ph.D. Student
Eriksson, Lars, Associate Professor