Experimental Research on the Measurement of High-Pressure Microflow Based on Momentum Principle

The fuel injector is an important component of the diesel engine. It has a great influence on the atomization of diesel fuel injection, the formation of mixed gas, and combustion emissions. Due to the current nozzle structure, processing level, and the internal hydraulic conditions of each nozzle, there are certain differences between the injection rules of each hole, and there are few methods to quantify the quality of the injector using mathematical methods in engineering. Based on the principle of spray momentum, this paper measures the injection characteristics of each hole of four five-hole pressureless chamber injectors of the same model and analyzes the circulating fuel injection volume and flow coefficient of each injector and each hole under different working conditions. It is proposed to evaluate the quality of the injector with the average circulating fuel injection volume, average flow coefficient, and nonuniformity as indicators. The test results are as follows: there are differences in the circulating fuel injection volume and flow coefficient between each hole of the same fuel injector. With the increase of the fuel injection pump speed, the average circulating fuel injection volume of each hole differs by 2.8%–47.5%, and the average flow coefficient differs by 3.7%–30%; as the fuel injection volume increases, the average circulating fuel injection volume of each injector differs 1.8%–36%, and the average flow coefficient difference is 2.5%–28.7%. The circulating fuel injection volume and flow coefficient of different fuel injectors of the same model are different. With the increase of the fuel injection pump speed, the average circulating fuel injection volume of each injector differs by 3.5%–9.6%, and the average flow coefficient differs by 1.4%–5.7%; as the fuel injection volume increases, the average circulating fuel injection volume of each injector differs 0.3%–5.5%, and the average flow coefficient difference is 2.8–4.2%. The relative flow coefficient of each hole differs from 0 to 0.02, and the nonuniformity differs from 1.8% to 16.9%. The relative circulating fuel injection amount of each hole differs from 0.02 to 0.1, and the nonuniformity differs from 1.1% to 6.9%. The relative flow coefficient of each hole and its nonuniformity is smaller than the relative circulating fuel injection volume of each hole and its nonuniformity.

Extraction Methods and Implementation Technologies of Fuel Injection Pump Cam Profile Characteristics

Because the traditional camshaft measurement methods cannot be applied to the injection pump cam, in order to improve the measurement automation of injection camshaft, an accurate extraction method of the characteristic parameters of the injection cam profile is proposed in this paper. In this method, the phase error optimization is realized by the angle precise rotation matching of the actual lift data. The optimization is realized by the Lagrangian polynomial interpolation algorithm based on the moving window. The goals of precise measurement of the peach point phase of single high point cam and accurate acquisition of the back dead point phase of high point arc segment cam are realized. Compared with the precision of high-precision measuring equipment, the method can extract the lift and phase angle error of the cam accurately and stably.

Analisis Manajemen Perawatan Actuator Sebagai Safety Device Dalam Memproteksi Terjadinya Overspeed Pada Mesin Penggerak Utama Kapal

Tujuan dari tulisan ini adalah untuk menganalisis penyebab Keterlambatan respon kerja dari actuator dalam melakukan aksi kontrol pada rack fuel injection pump pada saat kapal berlayar. Actuator adalah suatu alat pendorong yang digerakkan oleh sistem penumatik (sistem udara bertekanan) ataupun system hydrolik (media minyak hydrolik) dalam dunia control di aplikasikan sebagai alat keamanan pada mesin. Ketepatan proses actuator sebagai alat yang digunakan pada alat alat keamanan pada mesin penggerak utama kapal sangat berperan sebagai bagian untuk menjaga mesin penggerak utama agar bekerja dengan kondisi aman. Dengan latar belakang lemahnya respon kerja dari actuator sebagai pendorong rack bahan bakar pada fuel injecton pump yang berdampak pada kerusakan mesin penggerak utama dikarenakan overspeed. Permasalahan yang akan dianalisis adalah banyaknya hal yang menjadikan actuator bekerja tidak sesuai dengan fungsinya. Dalam penggunaannya actuator mendapat perintah sinyal dari tachometer yang berfungsi untuk membaca putaran mesin yang sebelumnya sinyal tersebut dikirimkan ke Safety Sistem Unit (SSU) untuk diproses serta dibandingkan dengan nilai yang diinginkan / diatur sesuai denan standart manual book dari mesin tersebut. Metode yang digunakan adalah dengan menggunakan pendekatan deskriptif kualitatif. Kesimpulan tulisan ini adalah Perlunya perawatan yang baik dalam sistem actuator untuk menghidarinya dari kegagalan dalam memproteksi kerja mesin,seperti pengecekan respon kerja dalam mendorong,sistem penggerak pneumatik ataupun hydrolik,kalibrasi nilai keluaran dari Tachometer atapun sistem dari Safety Sistem Unit (SSU)

Analisa Penurunan Daya yang Dihasilkan Mesin Bantu Guna Meningkatkan Operasional Kapal di MT. Dewi Maeswara

Mesin bantu memiliki peran yang sangat besar dalam pengoperasian kapal. Masalah yang sering muncul pada mesin bantu adalah tidak tepatnya waktu pengabutan bahan bakar oleh fuel injection pump dan goresan pada jarum tekan injector (plunger). Tujuan dilakukan penelitian ini yaitu untuk mengetahui penyebab tidak tepatnya waktu pengabutan bahan bakar ke dalam ruang bakar mesin bantu dan menemukan penyebab terjadinya goresan pada jarum tekan injector (plunger). Metode yang digunakan adalah deskriptif kualitatif. Dari hasil penelitian diperoleh kesimpulan bahwa terlambatnya waktu pengabutan bahan bakar pada diesel generator nomor 2 disebabkan karena rendahnya suhu gas buang pada silinder nomor 1 dan 2. Hasil pengambilan tekanan Pmax menunjukkan tekanan yang tidak mencapai titik maksimal pada silinder nomor 1 dan 2 atau Pmax nya terlalu rendah. Permasalahan pada fuel injektor (goresan pada jarum tekan atau plunger) disebabkan karena perbedaan temperatur gas buang yang sangat signifikan pada diesel generator nomor 2, termometer pada gas buang silinder nomor 4 dan 5 menunjukan angka diatas rata-rata sedangkan pada silinder lainnya yaitu nomor 1, 2, 3 dan 6 temperatur terlihat normal yaitu berkisar antara 3500C – 3700C

Comparison of intake and exhaust throttling for diesel particulate filter active regeneration of non-road diesel engine with mechanical fuel injection pump

Diesel particulate filter regeneration using intake and exhaust throttling is technically simple and economically efficient compared to other methods. The purpose of this study is to investigate not only the reasons for the increase in exhaust temperature during intake or exhaust throttling but also their feasibility as a diesel particulate filter regeneration technology. In this study, a non-road diesel engine having a mechanical fuel injection pump was used for experiments. The changes in exhaust temperatures were measured during intake and exhaust throttling for the no-load maximum revolutions per minute engine condition. The experimental results exhibited that both intake and exhaust throttling reduced the intake air mass flow rate and increased piston pumping, which then increased fuel consumption. These effects were the primary reasons for increasing the temperature of exhaust gases. In particular, intake throttling was more effective than exhaust throttling in terms of reducing the intake air mass flow rate. However, exhaust throttling caused larger pumping losses, resulting in higher fuel consumption. Furthermore, in case of exhaust throttling, engine combustion was possible even at high equivalence ratios because of the larger amounts of residual gases in the combustion chamber. In summary, exhaust throttling is more effective for regenerating a diesel particulate filter at a high temperature than intake throttling. In addition, this study verified the feasibility of diesel particulate filter regeneration using exhaust throttling through analyses of diesel particulate filter regeneration efficiency, fuel consumption, and exhaust concentration when regenerating the diesel particulate filter by increasing the exhaust temperature through exhaust throttling.