Abstract
This study investigates a preliminary injection characterization of the injection rate and the injection quantity behavior in a high-pressure common rail injection system used in a heavy-duty engine. The injection rate meter and the injection quantity meter used in the test meter measuring systems were jointly connected under the Zeuch method measurement principles at a constant volume chamber and under the Bosch method measurement principles at a long pipe flow. The trade-off trend for the injection rate and the injection quantity was observed according to the injection pressure. As expected, fuel injection with pilot injection affected the spray quantity and the injection evolution of subsequent fuel injection without pilot injection in dimethyl ether and diesel fuel. The pressure variations in the initial injection duration (2000–6000 µs) of the main and pilot injections for diesel and DME were similar. However, after 7000 µs, the pressure of DME increased more rapidly compared to that of diesel. This finding was the result of the rapid density changes caused by the nature of compressive fluid. Therefore, the DME supply pump was expected to require a higher drive energy by approximately 20% compared to that of the diesel supply pump.
Highlights
The use of the current diesel injection pump or common rail system as the injection device for dimethyl ether (DME), which is a compressive oil, poses many problems
Pulse, pressure variations, and nozzle needle lift by fuel spill, injection rate by injection pressure, and injection quantity according to the injection rate on the pilot and main rate by injection pressure, and injectionapplication quantity according to the injection ratetoon the pilot and main injections were to to thethe experimental engine obtain the basic data wereexamined examinedherein hereinbefore before application experimental engine to obtain the basic injections were examined before application toparticularly the experimental engine to obtain the basic required for engine experimentation in the future
We examined the optimum pressure, lift, pilot injection rate, mainininjection quantity, and injection according to the injection needle pressure, needle lift, pilot injection rate, main injection quantity,timing and injection timing injection pressure, needle lift, pilot injection rate, main injection quantity, and injection timing according to the injection duration when the current high-pressure electronic common rail was according to the injection duration when the current high-pressure electronic common rail was applied to an engine using a high-pressure fuel injection system by a common rail
Summary
The use of the current diesel injection pump or common rail system as the injection device for dimethyl ether (DME), which is a compressive oil, poses many problems. One of the major problems is the lubricity of DME being lower than that of diesel by more than 50%, which can cause sticking between the plunger and the barrel in a mechanical pump, sticking of a plunger in a high-pressure supply pump of a common rail system, and sticking of an injector in a solenoid valve and a nozzle in a needle valve. A previous study showed that the fuel injection system of the common rail type can independently control the injection amount by pressure, injection duration, and timing from the revolutions per minute (rpm) and load factor of the engine, thereby improving power and reducing emissions [4]. Exhaust gas recirculation rate and operating regions in a premixed DME HCCI (Homogeneous Charged Compression Ignition) was realized on the ultra-low NOx and smokeless emission with induced DME as the main fuel [5,6,7,8] and investigated on the effects of the combustion phasing with exhaust gas recirculation loop for external
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