Diagnosis of Evaporative Leaks and Sensor Faults in a Vehicle Fuel System
2001 (English)In: IFAC Workshop: Advances in Automotive Control,2001, 2001, 629-634 p.Conference paper (Refereed)
This paper describes a vacuum-decay based evaporative leak detection procedure for vehicle fuel systems. A physical model for an evaporative system is proposed containing parts for fuel evaporation, leakage flow and canister flow. Two methods for detecting evaporative leakages based on the model is presented. Both methods can detect a 0.5 mm diameter leakage in a laboratory environment. Keywords: purge system, fault diagnosis, fault detection, model based diagnosis 1. INTRODUCTION According to regulations for emissions from vehicles, fuel vapor leakage from the fuel tank must be detected. Fuel vapor is always generated in the fuel tank, the amount depends on ambient conditions like temperature and movement of the tank. Filling fuel also causes extra vapor to be generated. The fuel vapor may cause an over pressure that may push vapor out of the tank. Also, as fuel is consumed an under-pressure develops in the tank and it is required to level the fuel-tank gas pressure with ambi.
Place, publisher, year, edition, pages
2001. 629-634 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-39495Local ID: 49047OAI: oai:DiVA.org:liu-39495DiVA: diva2:260344
3rd IFAC Workshop Advances in Automotive Control, 28-30 March 2001, Karlsruhe, Germany