Jiang Beiping

Effects of injector optimization on emissions on a high pressure common rail diesel engine

In the test, the engine run at a specific speed when fuel consumption (Be) and torque remained constant. An ETAS calibration system is used to control the Maps for adjusting the rail pressure and injection timing. Experimental data show that when fuel injection is delayed, fuel consumption, CO and HC increase while formation of NOx reduces. The formation rate of pre-mixed gas is proportional to the rail pressure. When the rail pressure increases, more pre-mixed gas forms which will reduce the fuel consumption, improve CO and HC emissions but increase NOx. The data that is before and after optimization indicates that: in the selected test conditions, fuel consumption and torque are slightly lower on the optimized engine while values of NOx and smoke respectively reduce by 20% and 23%.

Simulation study on in-cylinder combustion process for high pressure common rail diesel engine

Based on YD4A75-C3 electronic-controlled common rail diesel engine, the characteristic of in-cylinder combustion was simulated. The research results showed that fuel vapor mainly is formed in the front of the jet spray, then the great part of fuel is diffused to the combustion chamber wall, concave and clearance by jet kinetic energy. In-cylinder peak temperature region all most appears in the outer space of fuel distribution, in the region oxygen content is comparatively higher and burning rate is relatively higher. Due to unburned fuel and combustion products absorbed more quantity of heat, and its distribution area also has relatively higher temperature. NO mainly is formed in the relatively higher oxygen-rich area in the outer space of high-temperature combustion flame, and Soot is formed in the high-temperature and fuel-rich region.

Simple calibration system for CNG engine based on LabVIEW

Set USB to CAN single point of communication protocol, developed LabVIEW-based engine calibration system easy to complete the calibration system software development and design, in the experiment, the system can be a good start, run, stop, and accurate implementation of the operation and Display information in real time to control the engine, the engine status changed, but also pre-set by the experimenter read the data accurately and precisely the engine real-time data were stored to the computer.