A study of the effect of electronic fuel injection on the CFR F5 cetane rating engine – Part II
2022-01-0537
03/29/2022
- Event
- Content
- This study is a continuation of previous work that investigated the benefits of installing an electronic fuel injection (EFI) system onto a CFR F5 cetane engine. The first paper presented baseline engine measurements that were taken to compare EFI against the original mechanical fuel injection system, along with computational fluid dynamics (CFD) simulations of the EFI injection and combustion processes. Early engine test results indicate EFI makes it possible to improve the current ASTM D613 precision limits by at least a factor of two. This paper presents additional work that was done to characterize the combustion process and optimize the EFI system for cetane rating. Engine instrumentation has been upgraded since the first paper. Combustion pressure data quality is improved due to a modification to how the cylinder pressure sensor is installed in the cylinder head, and crankshaft resolution has been increased from 0.144 crank angle degrees to 0.044 crank angle degrees to provide a more precise measurement of ignition delay. High resolution cylinder pressure traces were recorded for several diesel fuels under a wide range of operating conditions. Injection advance and ignition delay were varied to determine optimum conditions for improved cycle-to-cycle combustion stability. Reduced cycle-to-cycle combustion variation results in a more precise measurement of ignition delay, which is the fundamental measurement used to determine the cetane number of diesel fuel. Tests were performed with varying fuel rate to study the effects engine load on ignition delay. Fuels ranging between 40-75 CN were tested throughout the study.
- Citation
- Nielson, K., Zeman, J., and Dempsey, A., "A study of the effect of electronic fuel injection on the CFR F5 cetane rating engine – Part II," SAE Technical Paper 2022-01-0537, 2022, .