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The mean methods of improving performance of modern diesel engine include increasing speed, increasing cycle fuel injection quantity, increasing fuel injection pressure and intake boosting technology, so that more fuel quickly mixing with incylinder air in shorter time is requested. For solving these problems, the spray characteristics under the high injection pressure and high ambiance density must...
By means of schlieren method and gas pressure measurement, knock characteristics of hydrogen-air pre-mixture has been studied in constant volume combustion chamber. The effects of initial temperature, initial pressure and equivalence ratio on flame development process and pressure characteristics have been investigated. The experimental results show that knock caused by auto-ignition of unburned gas...
Using high-speed schlieren and shadow photography, the instabilities of hydrogen-air outwardly propagating spherical laminar premixed flame were studied in constant volume combustion bomb, at different fuel equivalence ratio (0.3 ~ 3.0), temperature (300K ~ 400K), pressure (1 ~ 3bar). The results show that: the flame instabilities decrease with increasing fuel-air equivalence ratio, increase with...
The multiple injection characteristics of two-actuator controlled fuel injection system(two-actuator system) were investigated in this paper, which was established by the Electronic Unit Pump and Common Rail injector to realize the way to independently control the pumping and injection processes. The two-actuator system simulation model was validated and the results indicated consistency between the...
The mean methods of improving performance of modern diesel engine include increasing speed, increasing cycle fuel injection quantity, increasing fuel injection pressure and intake boosting technology, so that more fuel quickly mixing with in cylinder air in shorter time is requested. For solving these problems, the spray characteristics under the high injection pressure and high ambiance density must...
The characteristics of two-actuator controlled fuel injection system which is established by the Electronic Unit Pump and Common Rail injector to realize independent controlling the pumping and injection processes are investigated from the point of experimental analysis. The experimental results indicate that high pressure up to 130Mpa can be generated on the advance two-actuator system at low camshaft...
This paper has designed a set of control system of waste gate valve actuator in turbocharger, it enables the waste gate valve regulate the exhaust flow before turbo automatically according to the operating condition of engine, so it can lower the pressure ratio and prevent the compressor surge occurrence when the compressor is in small flow. In this paper, it elaborated the regulation principles using...
In this article an improved constant volume combustion bomb with built-in adaptor is developed for improving the performances of ventilation and fire resistance. The adaptor contains an array of vias. By changing the tightening torque between the small bolt of each via and the corresponding nut the flow area of adaptor can be adjusted. With using the equipment, the auto-ignition characteristics of...
The existence of the holding and firing current critical values that maintain the solenoid valve's armature in a pick-up state exactly are discovered, and analyzed from the perspective of the electromagnetic and motion characteristics. Validation of the optimal holding and firing value of 2A and 11A took place on the Delphi E1 EUP. At the same time, different solenoid valve drive currents and their...
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