![]() ![]() USDA-ARS?s Scientific Manuscript database Moreover, there was a significant positive correlation between injection timing and the exhaust gas opacity in all engine speeds.Įvaluation of peanut fatty acid methyl ester sprays, combustion, and emissions, for use in an indirect injection diesel engine Injection pressure should be adjusted to the specification listed on the diesel engine as if it was too high or too low will lead to the higher opacity. As the results, the injection pressure of diesel engine had a non-significant positive correlation to the exhaust gas opacity with r = 0.113 and p > 5 %. Those data were also statistically analyzed by product moment correlation. The injector tester was used to measure injection pressure whereas the exhaust gas opacity was determined by the smoke meter. In this case, the engine speed was varied from 1000 to 2400 rpm. ![]() On the other hand, the various injection timing (8, 10, 12, 16 degrees before TDC point and exact 18 degrees before TDC point) were used to determine their effects to exhaust gas opacity. To investigate the injection pressure, the engine speed was retained on 1000 rpm with pressure variations from 80 to 215 kg/cm2. The default specification of injection pressure was 120 kg/cm2. A series of experiments were conducted in a one-cylinder conventional diesel engine with a naturally aspirated system and indirect injection. The influences of injection pressure and timing to exhaust gas opacity were investigated. In relation to pollution control and environmental friendliness, the quality of exhaust gas from diesel engine needs to be considered. The second pattern is powering up the fuel injector and contains a small voltage spike at the same time as the amperage goes up.Effects of injection pressure and injection timing to exhaust gas opacity for a conventional indirect diesel engineīudiman, Agus Majid, Akmal Irfan Pambayun, Nirmala Adhi Yoga Yuswono, Lilik Chaerul Sukoco If you go into your lab scope you can see two different patterns displayed, one after the other. That’s where the connection is made for this example. The tool tells you that the best place to test on these vehicles is either at the injector itself, which can be hard to reach, or a 16-pin connector on the left rear side of the engine, above the engine oil filter housing. The PCM contains a smart driver that actually monitors each side to see whether there's a problem and it will display a code for whatever the problem happens to be If boost voltage is unavailable, the correct injector opening current might not be generated in the time required The injector driver controls three transistors switches that apply the boost voltage to open the injector and then modulates the current to hold the injector open ![]() The gasoline direct fuel injector delivers fuel directly into the cylinder under high pressure.Įach injector is controlled by two circuits from the PCMĪ boosted voltage supply up to 65 volts is generated in the PCM and used to initially open the injector Now the tool going to give us some information so we'll go into Component Information and it tells you how the system operates: With the vehicle identified, go into the Fuel Injection System menu and then into Fuel System, followed finally by Fuel Injector. Inside all of the Snap-on scope tools is the Guided Component Tests section, which gives us a lot of information on how things work and where to connect the tool to the vehicle – let’s use a 2016 Ford Escape with an EcoBoost ® motor for this example. With a Snap-on scan tool hooked up to the vehicle, we can see how the data looks on a lab scope and how the pattern is actually different than a standard fuel injector. Manufacturers had been using this system on diesel vehicles for quite some time so if you've never worked on a diesel you might not know it's a little bit different. It's a far more efficient way of injecting fuel into the engine. Did you know that fuel injectors on Direct Injection vehicles work differently than a standard fuel injector?Ī lot of newer cars use petrol direct injection. ![]()
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