Change search
ReferencesLink to record
Permanent link

Direct link
Modeling and Control of Retarder using On/Off Solenoid Valves
KTH, School of Electrical Engineering (EES), Automatic Control.
2008 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The Retarder is one of the main components in Scania's trucks' braking system and is used to brake down the truck and for maintaining a steady speed on descents. This Master's Thesis aims to investigate if the current system which uses a proportional valve to control the air pressure in the Retarder, can be replaced with two on/o® solenoid valves and a pressure chamber to control the air pressure, which would result in a cheaper and more robust system. By varying the air pressure, the braking torque in the truck can be regulated. A model including electrical drives from a control unit, valves, pressure chamber and a regulating valve is derived. Using the model as reference, a controller is designed and implemented to control the valves, and thereby the pressure. Based on experience from employees at Scania and former research on on/o® control of an Exhaust Gas Recirculation system, a regular PID-controller is used as the base in the control. A pulsing scheme where the valves are activated separately is used to distribute the control signal to the two valves. Di®erent ways of applying the control signal are investigated, whether the valves run digital, i.e. 0 % or 100 %, or continuously by varying the PWM signal. A boosting action using non-linear control, and prediction are investigated in order to improve the control performance in such way that the required time response and robustness is obtained. The controller is eventually tested and veri¯ed on the real system.

Place, publisher, year, edition, pages
2008. , 93 p.
National Category
Control Engineering
URN: urn:nbn:se:kth:diva-105880OAI: diva2:572695
Subject / course
Automatic Control
Educational program
Master of Science in Engineering
Available from: 2012-12-03 Created: 2012-11-28 Last updated: 2012-12-03Bibliographically approved

Open Access in DiVA

fulltext(773 kB)3092 downloads
File information
File name FULLTEXT01.pdfFile size 773 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Automatic Control
Control Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 3092 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 120 hits
ReferencesLink to record
Permanent link

Direct link