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The challenge for the high speed direct injection (HSDI) diesel engines today is to reduce harmful emissions of diesel engines, such as particulate matter (PM) and Nitrogen oxides (NOx), and enhance the fuel efficiency and power. To meet this challenge, more accurate control of injection parameters such as the injection timing, injection rate, and injection quantity is required. Compared with solenoid...
Common rail based direct injection system is critical for improving the fuel economy and emissions of both gasoline and diesel engines. The fuel pressure pulsation inside the common rail is induced by high-speed flows in and out of the common rail. This phenomenon could adversely affect the accuracy of injected fuel quantities and flow rates. So it is desirable to compensate for the pressure pulsations...
Piezo actuated diesel fuel injector is gradually replacing the conventional solenoid injector since it can provide a more flexible control ability of the fuel injection. Engine performance can be benefitted from such flexible injection. For fully utilizing the advantages of the piezo actuated injector, precision control of the piezo actuator is therefore needed. In this work, a programmable injector...
To reduce the emission by Diesel-engine in railway traction, continuous development and innovation in combustion, sensing net, control method and strategies are required to met the legal requirements. Multiple combustion modes by Diesel engines can reduce significantly the emissions and maintain the functionality of the exhaust treatment systems by simultaneous achievement of the desired torque-speed...
Homogeneous charge compression ignition (HCCI) represents a promising combustion strategy for future engines. However, HCCI lacks an easily identified combustion trigger and, when achieved via variable valve actuation (VVA), includes cycle-to-cycle coupling through the exhaust gas. This makes controlling the process decidedly non-trivial. To address these issues, the development of a closed-loop controller...
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