10 th International Automotive Technologies Congress OTEKON 2020 6-7 September 2021, Virtual Congress ELECTRIFIED AUXILARY SYSTEM DEMAND CONTROL OF A HYBRID ELECTRIC REFUSE TRUCK Mehmet GÖL, Ahu Ece HARTAVİ 1, Istanbul Gelisim University, Electric and Automation Department, Istanbul, Turkey, mgol@gelisim.edu.tr 2 Corresponding Author: University of Surrey, Department of Mechanical Engineering Sciences, Surrey, UK, a.hartavikarci@surrey.ac.uk ABSTRACT Automotive manufacturers tried to meet challenges created by clean transport revolution. As more emphasis is put on the request for clean transport, as well as passenger cars, demand for electrified medium/heavy duty vehicles that can fully function on the road will increase. However, even though, electric/hybrid electric vehicles (EVs/HEVs) have demonstrated significant fuel consumption and emissions reductions, range and cost effectiveness has still been a barrier faced by many vehicle manufacturers. And this shifts the balance of technologies used in the vehicles even further in the direction of electrically powered auxiliary systems. The focus of this study is on energy consumption of the auxiliary systems. In this study, detailed vehicle simulation MATLAB/SIMULINK is used to investigate how to reduce the auxiliary sub system systems energy consumption. The methods used for reducing energy and fuel consumption are better control of the auxiliary system loading vehicle driveline and selection of more energy efficient components for the auxiliary systems. Keywords: Auxiliary system, Energy consumption, Hybrid Electric Refuse Truck 1. INTRODUCTION AND MAIN SECTIONS Day by day, increasing awareness of global warming, environmental concerns and fossil fuel reduction triggered demand for clean transport. Therefore EVs are the most preferred technology for substituting the fossil fuel-driven vehicle. Within this frame, world’s major cities set ambitious emissions targets to reduce carbon dioxide emission levels. Therefore , municipalities push the use of EVs mainly for waste collection and public transport. The Series Hybrid Refuse Trucks (Se-RTs) have several distinct advantages over conventional ones, which are:  Quieter Operation, which reduces the environmental noise pollution.  Reduced Tailpipe Emissions  Low Maintenance Cost due to the better time investment policy [1] The hybrid electric truck is suitable for reducing emissions and making fuel economy more efficient. Therefore, a detailed analysis of the energy consumption of the battery electric truck, innovative features such as recharging the battery with regenerative braking should be taken into account. It is not only the traction system on board a vehicle that consumes power. The number of, and diversity of, loads that are used either to just facilitate the operation of the vehicle, or to increase the comfort and usability of the vehicle is steadily increasing. Some of these loads are mechanically driven via a belt from the crankshaft of the ICE, and yet some are electrically driven. In hybrid vehicles, and especially those without an ICE like the Fuel Cell vehicle, it is beneficial or necessary to drive the auxiliary loads with electric power. There are several advantages of doing so: 1 The load can be more freely placed within the vehicle since they do not have to be connected to the belt in the front of the ICE. This give both a weight and volume benefit. 2 The efficiency can be significantly increased, since the possibilities to control the power consumption is bigger when an electric machine is driving the load. The AC compressor, as an example, can be driven at the optimal speed all the time. In a conventional vehicle the AC compressor is tied hard to the ICE speed which is related to the vehicle speed, not to what is best for the AC compressor [2].