Gasoline Direct Injector Deposits: Impacts of Fouling Mechanism on Composition and Performance
2022-01-0582
03/29/2022
- Event
- Content
- Gasoline Direct-Injection Spark-Ignition (DISI) injector performance is a key focus in the automotive industry as the vehicle parc transitions from Port Fuel Injected (PFI) to DISI engine technology. DISI injector deposits, which may impact the fuel delivery process in the engine, seem to accumulate over longer time periods and greater vehicle mileages than traditional combustion chamber deposits (CCD). These higher mileages and longer timeframes make the evaluation of these deposits in a laboratory setting more challenging due to the extended test durations necessary. The need to generate injector tip deposits for research purposes begs the questions, can an artificial fouling agent to speed deposit accumulation be used, and does this result in deposits similar to those formed naturally? Field testing was used to develop high-mileage injectors from DISI vehicles. At approximately the 200,000-mile point, the fuel injectors were removed and used to evaluate and compare high-mileage, reduced-flow rate injectors against injectors fouled artificially in a laboratory setting. The DISI injectors were holistically evaluated for their spray performance, deposit composition, and deposit morphology relative to injectors from test-stand-mounted engines and chassis dynamometer-mounted vehicles, both of which were fouled through the use of a chemical dopant. The testing and accompanying analysis reveals both similarities and differences among naturally fouled and profouled injectors, insights from which can guide future research into injector tip deposits.
- Citation
- Smocha, R., Vuilleumier, D., Christison, K., Loeper, P. et al., "Gasoline Direct Injector Deposits: Impacts of Fouling Mechanism on Composition and Performance ," SAE Technical Paper 2022-01-0582, 2022, .