![]() ![]() ![]() 2005) or piezoelectric injectors (Lee et al. Such shaping of the injection process has been utilized in compression-ignition engines using electromagnetic (Hountalas et al. The first scientific works on the research of injection systems in CI engines using rate-shaping appeared several years ago (Egnell 2000 Juneja et al. The split fuel dose injection is a method for controlling the combustion process and the associated exhaust emission. The use of injection rate-shaping may be an effective method of controlling the variable fuel flow from the injector and may allow the replacement of multi-stage fuel injection. The surface area of the spray is limited by a maximum of 60% compared to the settings at the maximum control voltage. A reduction of the linear range of the spray by 50% and a radial range by 40% compared to conventional settings within a specified time from the start of the injection was achieved. It has been found that injection rate-shaping allows to control the fuel flow from the injector at a variable needle height. ![]() Analyzes of changes in linear and radial fuel spray range as well as the fuel spray volume were made. The tests were carried out in a constant volume chamber with a constant fuel dose ( P inj = 15 MPa and q o = 17.4 mg), with two values of medium back pressure: P b = 1.0 and 1.5 MPa as well as different injector opening times (resulting from equal doses of fuel). This system allows controlling a piezoelectric injector with a time-varying needle height, which affects the time-varying fuel flow during a single-time opening of the injector needle. To control such a system, the cRIO 9063 system and NI-driven module were used. The presented test results contain an analysis of the variable control of fuel flow from high-pressure gasoline injectors. ![]()
0 Comments
Leave a Reply. |