The CEC F-98-08 Peugeot DW10 diesel fuel injector coking test has now been formally approved for nearly three years, during which time it has become widely accepted as an important measure of base fuel and additive performance in modern direct injection common rail equipped vehicles. There has however been some discussion during this time as to the relationship of this dynamometer test to behaviour in actual vehicles. This paper describes work with a vehicle equipped with a DW10 engine that aims to address this issue. A series of DW10 bench engine tests were conducted to explore the effect of biodiesel (B10) and deposit control additive on injector fouling. A set of injectors fouled in the DW10 bench engine test using biodiesel were then installed in a Peugeot 307 vehicle and the vehicle power was measured on a chassis dynamometer. The power loss measured was comparable to that measured in the test bed engine. The vehicle was then driven under normal road driving conditions with the same fouling B10 biodiesel and the power remained largely unchanged. When the vehicle was driven on the same biodiesel treated with an advanced diesel deposit control additive (DCA), the power restored almost to the starting level. This was confirmed by cleaning the injectors in an ultra sonic bath and then retesting them. This paper presents a valuable comparison between engine tests that are conducted under precisely controlled laboratory conditions and vehicle tests that are conducted in a more variable environment, but one that is representative of that experienced by end users. It shows that fouled injectors will display a comparable level of power loss in a vehicle as in the bench test and it confirms that an effective deposit control additive that provide benefits in the bench engine, will also provide benefits under normal driving conditions.
A comparison of Peugeot DW10 dynamometer and vehicle engine performance
2011
8 Seiten, 10 Bilder, 5 Tabellen, 11 Quellen
Aufsatz (Konferenz)
Englisch
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