Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Stability Approach for Automotive Fuel Tank System Premature Shutt-Off Prediction
Submission Author:
karl peter burr , SP
Co-Authors:
Eric Neugebauer, karl peter burr
Presenter: karl peter burr
doi://10.26678/ABCM.ENCIT2022.CIT22-0328
Abstract
Almost every driver had the experience of fuel pump shutdown before the car fuel tank is completely filled up, the premature shut-off. This phenomenon is a source of automobile industry customer dissatisfaction. According to the literature, the normal filling process has three phases: an initial transient phase; a second phase when pressure is constant in time along the tank system; and a short final transient phase before the fuel pump stops. The objective of this work is to explain premature shut off as a consequence of the absence of the system pressure steady state (second phase) in the fuel supply process using an adequate flow model and linear stability analysis. The solution corresponding to the second phase of the fuel supply process is constructed numerically as a function of the system parameters and boundary conditions space (SPBC space) and its linear stability is studied. This solution is denoted as an almost stationary (AS) state since it is an explicit linear function of time. The linearized governing equations with respect to the AS state gives a linear nonautonomous system of algebraic differential equations (DAE) and standard linear stability techniques do not apply. The finite time (less than the fill up time) action of this linear DAE system over a unitary volume in the phase space dictates the AS state linear stability. Stability maps in the SPBC space are obtained.
Keywords
automotive fuel tank system, fuel supply premature shutt-off, Multi-phase flow, Linear Stability Analysis, non- autonomous dynamic systems
