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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.

The high volume of waste produced by both industry and society is common in almost all cities. For this reason, it is necessary to control the increase in the volume of waste and its implications for the environment. The scenario used in this research is to design a power plant that can be used to control the increase in the volume of waste, namely PLTSa (Waste Power Plant). PLTSa uses organic waste from trash to generate clean, renewable energy, powering communities, and reducing emissions. At the PLTSa, the organic waste is fed into a digester tank, where it is converted into methane by bacteria. The gas is then sent to the waste power plant, which generates 0.9 MW of power. The PLTSa supports the Indonesian government’s plan to increase electricity in the country by 35,000 MW from 2015 to 2019, and for 25% of that electricity to be generated from renewable sources. The government’s plan was in response to a shortage of electricity generation capacity as demand in the country grows. The data analysis method used to analyze the research data is an analysis using the IPCC Inventory software and the LFGcost-Web Landfill Gas Emission Model (LandGEM). Data analysis results in the form of projections of biogas potential and electrical energy will be used to build PLTSa. Waste-to-energy generation is being increasingly looked at as a potential energy diversification strategy, especially in Indonesia and PLTSa (Waste Power Plants) in several cities in Indonesia.

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Penggunaan teknologi sel surya sebagai sumber energi listrik di Indonesia masih sangat minim padahal potensi sumber energi matahari sangat melimpah. EBT mempunyai peran yang sangat penting dalam memenuhi kebutuhan energi. Dalam hal ini, energi surya merupakan alternatif energi terbarukan yang mampu menjadi salah satu solusi untuk menjadi pengganti energi fosil. Menggunakan masing-masing dua alternatif untuk komponen utama panel surya dan inverter maka terdapat 4 variasi rancangan konfigurasi komponen dalam penelitian ini. Variasi 1 menggunakan panel surya osda dengan inverter solis. Variasi 2 menggunakan panel surya osda dengan inverter sofar. Variasi 3 menggunakan panel surya risen dengan inverter solis. Variasi 4 menggunakan panel surya risen dengan inverter sofar. Melalui software PVSyst 7.0, dengan rata rata radiasi sebesar 4,16 kWh/m2/hari, potensi kinerja dari masing-masing variasi perancangan PLTS rooftop kapasitas 1200 Wp  ini akan menghasilkan energi listrik sebesar 1266 kWh, 1259 kWh, 1401 kWh dan 1393 kWh. Biaya investasi masing-masing variasi perancangan PLTS pada penelitian ini adalah Rp23.072.000, Rp21.922.000, Rp24.572.000, dan Rp23.422.000 dengan nilai Net Present Value masing-masing variasi adalah Rp6.384.126, Rp7.631.112, Rp7.816.540, dan Rp9.023.991 dengan waktu pengembalian biaya investasi masing-masing variasi berdasarkan discounted payback period yang dihitung adalah 13,13 tahun, 12,83 tahun, 12,78 tahun dan 12,26 tahun

Automotive developments led to increased demand for fuel. Vehicle need fossil fuels to move them, while the fossil energy in this world is decreasing over time because fossil energy cannot be renewed. This has triggered the development of the use of electrical energy in the transportation system as a substitute for fossil fuels whose energy source is from renewable energy such as biomass energy (such as methane), hydropower, geothermal power, wind energy, and solar energy. One method that can be done to reduce the use of fossil energy is by utilizing electrical energy as an energy source in cars. In this study, an electric car prototype was designed using a three-phase induction motor with 3 HP power as the main driving force. To find out the power consumption and torque produced, it is necessary to analyze the calculation of power and torque when loaded and without load. In this research, the electric car prototype uses load variants, 40 kg, 60 kg, and 100 kg. Where the maximum torque that can be generated by the motor when no load is 9.94 Nm and when it is loaded is a variation of the load of 100 kg of 11.80 N.m. Calculation of the maximum power that can be generated by the motor when no load is 1976.94 watts and when loaded is a variation of 100 kg of 1202.59 watts. The data from the calculation of torque is inversely proportional to power, where the greater the power, the smaller the torque produced.