The root-cause analysis of engine stall at hot ambient resulted from low pressure fuel pump
2022-01-0753
03/29/2022
- Event
- Content
- The evaluation of fuel pump performance at high temperature of gasoline vehicle is closely related to fuel characteristics, and both the fuel pump performance and the characteristics of the test fuel must be considered. As gasoline fuel have different levels of vapor at high temperatures based on vapor pressure and boiling characteristics, it is inevitable to analyze the characteristics of the fuel prior to testing. Even if the high temperature climate condition is harsh, it is not sufficient to evaluate the effect of fuel boiling on fuel pump performance if the boiling characteristics are not harsh enough. In recent years, E10 fuel(10% ethanol + 90% gasoline) is being sold in many countries, and all automobile companies are developing gasoline vehicles to use E10 fuel. However, the use of E10 fuel changes fuel characteristics such as Reid Vapor Pressure(RVP) and distillation lines, and fuels that have ethanol must also be considered in high-temperature fuel tests. A fuel pump transfers the fuel to an engine, however, many vapors produced by boiling of gasoline fuel at high temperature decreases the pressure of the fuel system and the fuel flow rate of the pump, reducing the fuel supply performance. This can ultimately lead to engine stall and hesitation during the drive. The purpose of this study was to determine the fundamental reasons for engine stall by fuel pump in high temperature through the analysis of the causes that lead to engine stall. From the vehicle perspective, this study can be applicable in all vehicles using gasoline engine, and in terms of the fuel perspective, it can be applicable in all flexible fuel system including gasoline fuel.
- Citation
- Kim, K., "The root-cause analysis of engine stall at hot ambient resulted from low pressure fuel pump," SAE Technical Paper 2022-01-0753, 2022, .