Towards a fully computer controlled test rig for low pressure parts in trucks

Abstract: This master thesis was carried out at Scania CV AB, and was proposed in order to explore the possibilities to modernize the present test rig for low pressure parts in the fuel systems in trucks. The rig at the present is hard to maneuver and it is also problematic to do accurate measurements, thus maintain decent repeatability when testing a series of parts. It is also almost impossible to regulate flow and pressure. By integrating a computer for the controlling of the rig and logging of data many of the problems can be solved. During the time of the thesis a conceptual plan, hardware suggestions and complete software was designed to meet today’s requirements for the testing of low pressure parts. Models of flow and pressure have also been made in order to prove what control strategy is the best one to use. The software has been implemented and tested for flow control and is shown to work satisfactory.