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Penelitian ini bertujuan untuk: (1) Mendeskripsikan bagaimana sensor-sensor dalam sistem EFI bekerja pada putaran idle, mesin rotasi tingkat menengah dan tinggi, dengan melihat sensor output. (2) Mengetahui pekerjaan aktuator pada Sistem EFI pada putaran idle, mesin rotasi tingkat menengah dan tinggi. Metode eksperimen digunakan untuk penelitian ini. Mesin EFI dengan tipe D EFI yang digunakan telah dianalisis. Alat pindai digunakan untuk mengamati untuk mengukur output yang dihasilkan oleh sensor dan mengukur kerja aktuator sistem EFI menggunakan alat Pindai. Dari percobaan ditemukan bahwa peningkatan putaran mesin akan menghasilkan peningkatan kerja aktuator pada Sistem EFI, yang terdiri dari Injeksi Waktu dan Pengisi Waktu Pengapian, tetapi untuk Idle Speed ​​Control Valve (ISCV) dan Intake Camshaft Timing perubahan relatif stabil.

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A gasoline motor engine using electronic control system has several sensors and actuators driven by a computer. This paper aims to reveal the role of an engine temperature sensor mounted on a gasoline engine motor. The testing data shows that there is a connectivity between the temperature data obtained from the coolant temperature sensor with the fuel injection time and the exhaust gas emission content.

The critical environmental issues of the Indonesian automotive market growth are the increase in air pollution. Vehicle exhaust emission can cause significant problems for the human health and the environment. Therefore, vehicle emission control is indispensable to mitigate the environmental problem. One of the most widely used methods to reduce automotive emission is utilization of catalytic converter in exhaust system. In fact, the catalyst performance in the reduction of noxious gases depends on its material and geometric design. This study aims to evaluate the effect of geometric parameter on the performance of motorcycle catalytic converters. In this experimental study, the catalytic converter made of brass foil plate is mounted on motorcycle muffler. The effectiveness of three catalyst geometry models namely flat perforated plate, folded perforated plate and rolled brass sheet, will be evaluated in relation to the reduction of hydrocarbon (HC) and carbon monoxide (CO) content. HC and CO emission levels are measured by four gas analyzers. The results show that the geometric parameter has a significant effect on HC and CO’s composition in the exhaust gas. For idle speed test, the second geometry model of catalyst presents the best performance in reduction of Hydrocarbon and CO2 concentration.