Development of internal combustion engine control system is currently oriented on exhaust emissions, performance and fuel efficiency. This is caused by fuel prices rising which led to a crisis on the transport sector; therefore it is crucial to develop a fuel-efficient vehicles technology. Gasoline engine fuel efficiency can be improved by several methods such as by controlling the air-to-fuel ratio (AFR). AFR technology currently still has many problems due to its difficulty setting characteristic since AFR control is usually as internally engine control. Fuel efficiency can be improved by influence of external engine system. Brake control system is an external engine system that used in this research. The purpose of this research is to design and implement the AFR and brake control system in a vehicle to improve fuel efficiency of gasoline engines along braking period. The basic idea is the controller has to reduce the consumption of fuel injection along braking period. The applied control system on vehicle works using smart controller, such as Fuzzy Logic Controller (FLC). When the vehicle brakes, fuel injection is controlled by the ECU brake control system. This control system works in parallel with the vehicle control system default. The results show, when the engine speed exceeds 2500 rpm, AFR value increased infinitely, so that maximum efficiency is achieved. At engine speed less than 2500 rpm, AFR value reaches a value of 22. The fuel measurement has been able to show a decrease in fuel consumption of 6 liters to 4 liters within the distance of 50.7 km. Improvement of fuel efficiency can be achieved by approximately of 33.3%.
Tingginya volume sampah yang dihasilkan baik oleh industri maupun masyarakat merupakan permasalahan umum yang dijumpai di hampir semua kota. Untuk mengendalikan pertambahan volume sampah beserta implikasinya terhadap lingkungan, Incenerator menjadi salah satu metode yang dapat dipilih diantara metode gasifikasi yang lain, incinerator berfungsi sebagai pembakar sampah dan sebagai pembangkit uap dengan mengkonversikan panas pembakaran. Keuntungan penggunaan incenerator adalah kemampuannya untuk mereduksi sebagian besar timbunan sampah dan mampu menurunkan polusi lingkungan akibat penimbunan sampah. Sedangkan kerugian penggunaannya antara lain, gas buang membawa karbon dioksida (CO2) sejumlah besar yang akan terlepas ke udara serta pembawa unsur beracun dalam gas. Untuk mengendalikannya diperlukan peralatan tambahan sebelum gas dilepas ke udara , hal ini berarti tambahan biaya dalam konstruksi incenerator.
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