Fuel injection rate shaping and its effect on spray parameters in a direct-injection gasoline system

Abstract The presented test results contain an analysis of the variable control fuel flow from high-pressure gasoline injectors. To such a system, cRIO 9063 system and NI-driven module were used. This allows controlling piezoelectric injector with time-varying needle height, which affects during single-time opening needle. tests carried out in constant volume chamber dose ( P inj = 15 MPa q o 17.4 mg), two values medium back pressure: b 1.0 1.5 as well different times (resulting equal doses fuel). Analyzes changes linear radial spray range made. It has been found that injection rate-shaping to at height. A reduction by 50% 40% compared conventional settings within specified time start was achieved. surface area is limited maximum 60% voltage. use may be effective method allow replacement multi-stage injection. Graphical