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1.
Sistem Pengapian menggunakan Distributor (DI)
Sinyal Ne dihasilkan oleh sensor crankshaft (disebut juga sensor kecepatan mesin). Sinyal G dihasilkan oleh sensor posisi camshaft yang mungkin ditempatkan di dalam distributor atau pada mesin.
Pada waktu silinder kompresi akan tercapai, ECM mengirimkan sebuah sinyal IGT ke igniter. Sinyal ini akan mengaktifkan (turn-on) transistor dan kemudian transistor akan mengalirkan arus melalui lilitan primer dari coil pengapian. Supaya pengapian terjadi dengan optimum, ECM akan mematikan sinyal IGT dan transistor akan menon-aktifkan aliran arus yang tadi melalui lilitan primer coil pengapian. Arus induksi mengalir melalui lilitan sekunder coil, ke kap distributor, ke rotor, ke terminal distributor yang berhadapan dengan rotor, ke kabel busi, ke busi, dan terakhir ke ground. Posisi rotor menentukan silinder yang akan menerima percikan api. 2.
Urutan pengapian (Firing Order)
Urutan pengapian silinder adalah sebagai berikut: mesin V-8 silinder genap di bank yang kiri dan ganjil di bank kanan. mesin V-6 silinder ganjil di bank kiri dan genap di bank kanan. mesin In-line 6 silinder nomor 1 di depan dan 6 di delakang mesin. Mesin empat silinder dinomori dari depan ke belakang.
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Seringkali, perangkat tutp distributor memiliki urutan pengapian yang dicetak langsung pada tutupnya untuk memudahkan dalam instalasi kabel busi.
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3.
Sistem Pengapian Langsung dan Tanpa Distributor.
3.1. Overview Secara esensial, sebuah sistem pengapian tanpa distributor adalah sistem pengapian tanpa sebuah distributor. Dengan menghilangkan komponen distributor akan meningkatkan reliabilitas karena berkurangnya komponen mekanis. Keuntungan lain adalah: Greater control over ignition spark generation; Akan banyak waktu untuk sebuah coil mengumpulkan medan magnet yang diperlukan untuk menghasilkan sebuah percikan api yang akan dipakai untuk membakar campuran udara dan bahan bakar. Hal ini mengurangi efek gagalnya silinder terbakar. Interferensi listrik dari distributor dapat dikurangi; dikurangi; Coil-coil pengapian dapat ditempatkan sedekat mungkin dengan businya. Hal ini membantu mengurangi efek interferensi listrik dan meningkatkan reliability. Timing pengapian dapat dikontrol dalam jangkauan yang lebar; lebar;
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percikan pengapian dihasilkan dari satu buah coil untuk dua silinder secara simultan.
Sistem Pengapian Langsung (Direct Ignition System – DIS) memilki coil yang dipasang pada businya. DIS dirancang dalam dua bentuk, yaitu: Independent Ignition – satu coil per silinder Simultaneous ignition – satu coil untuk dua silinder, Dalam system ini sebuah coil dipasang langsung ke salah satu busi dan sebuah kabel busi menyambungkan coil ini ke busi (di silinder) yang lain. Sebuah Percikan api yng dihasilkan dipakai oleh kedua silinder tersbut secara simultan.
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Cara Kerja Pengapian Simultan (DLI) Sistem DLI dan DIS sama-sama menggunakan satu coil untuk dua silinder. Dengan sistem simultan, dua silinder merupakan pasangan pada posisi pistonnya. Hal ini memiliki efek bahwa tegangan sekunder coil yang diperlukan tidak akan terlalu besar. Contoh; Pada mesin V-6, silinder nomor 1 dan 4, posisi piston telah mencukupi posisi pada kondisi TDC dan BDC
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Biasanya busi-busi untuk sistem DLI atau DIS adalah dari jenis busi berbahan platinum guna memenuhi karakteristik stabilitas pengapian yang stabil. Tegangan untuk percikan api biasanya ditentukan oleh kerenggapan gap busi dan tekanan kompresi. Jika gap busi antara kedua silinder sama, maka sebuah tegangan juga secara proporsional pada kedua busi sama. Tingginya tegangan yang dihasilkan adalah dibagi dua tergantung pada tekanan
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4.
Sistem Pengapian Langsung (DIS)
Dalam aplikasi sistem pengapian DIS independent, mungkin saja digunakan
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pemutusan (cut-off) secondary ignition. Jika coil ditemukan tidak berfungsi segera ganti dengan coil lain yang berfungsi. Mesin 1MZ-FE dengan DIS Simultan. Sistem ini memakai tiga sinyal IGT untuk memicu coil dalam urutan yang tepat. Ketikan sebuah coil turn-on, IGF menjadi rendah.
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DIS dengan pengapian independent
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Sudut untuk timing pengapian yang diset selama pengaturan timing pengapian disebut “standard ignition timing”. Ini terdiri dari sudut initial ignition timing ditambah dengan sebuah sudut advance timing yangtetap (sebuah nilai sudut yang tersimpan dimemori ECM dan dikeluarkan selama pengaturan timing dari proses koreksi, dsb. Selama kendaraan dipakai secara normal).
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Generator-generator sinyal Ne dan G adalah dalam posisi tetap (DLI dan DIS), ignition timing tidak bias distel. Diagnostic Ketika igniter dibuat di dalam coil, hal ini tidak mungkin untuk mengukur nilai resistansi dari lilitan primer coil. Buruknya lilitan primer akan ditentukan dengan cara mengukur fungsi yang lain dari coil dan rangkaian pengapiannya. DTC 1300 akan muncul pada tester, tergantung pada jenis mesin dan sistem pengapiannya, ketika ECM tidak menerima sinyal IGF. IGF mengkonfirmasikan bahwa lilitan primer coil bekerja dengan baik. Hilangnya sinyal IGF mengindikasikan sebuah malfunction di dalam rangkaian primer
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TUGAS NAME: ___________________________ 1.
2. 3. 4.
Jelaskan perbedaan antara Sistem pengapian Independent (Direct) dan Simultan (Waste spark) termasuk jumlah coil yang dipakai pada masing-masing sistem! Jelaskan secara lengkap cara Kerja Sistem pengapian Simultan Waste spark! Gambarkan sebuah sistem pengapian dasar untuk 4 silinder dengan menggunakan sistem Waste spark! Jelaskan secara lengkap cara Kerja sistem pengapian Independent (Direct)!