Search International and National Patent Collections

1. (WO2018013032) METHOD AND SYSTEM FOR DIAGNOSING UNINTENDED FUELLING FROM FUEL INJECTORS OF AN ENGINE

Pub. No.:    WO/2018/013032    International Application No.:    PCT/SE2017/050659
Publication Date: Fri Jan 19 00:59:59 CET 2018 International Filing Date: Tue Jun 20 01:59:59 CEST 2017
IPC: F02D 41/22
F02D 41/38
F02M 65/00
Applicants: SCANIA CV AB
Inventors: KYLSTRÖM, Kim
HÄLLEBERG, Roger
STENLÅÅS, Ola
Title: METHOD AND SYSTEM FOR DIAGNOSING UNINTENDED FUELLING FROM FUEL INJECTORS OF AN ENGINE
Abstract:
The present invention relates to a method for diagnosing unintended fuelling from one or more fuel injectors of a multi cylinder internal combustion engine during engine operation. Pressurised fuel is intended to be distributed by means of said fuel injectors from said accumulator tank to the cylinders for combustion. An oxidation catalyst is arranged downstream said cylinders. The method comprises the steps of: determining (S1) the pressure in the fuel accumulator tank and whether said pressure is decreasing; and determining (S2) whether the actual amount of fuel provided by the pump unit exceeds the demanded amount of fuel. The method further comprises the steps of: determining (S3) whether the temperature associated with the oxidation catalyst is above a certain level and/or determining (S4) whether the air/fuel ratio is below a certain level and/or determining (S5) whether an amount of particulate matter is above a certain level; and confirming (S6) an unintended fuelling based on the determined conditions.