Gearshift strategy extraction in the WLTC cycle for optimizing: Gasoline engine emissions, Energy and Fuel consumption

In most countries, the NEDC is used as a driving cycle. According to The International Council on Clean Transportation studies, the inefficiency and steady-state mode of the NEDC cycle in the past decades, there has been a profound disparity between Energy and Fuel consumption also, Greenhouse gas emissions in real-time driving and manufacturer's reports. For this reason, a new driving Cycle, worldwide harmonized light vehicles test cycle (WLTC), which provides driving characteristics in real-world conditions, was introduced. In this research, the gear-shift strategy in the WLTC cycle was investigated on the Peugeot 308 engine. In the WLTC cycle, at first; the required and available power is calculated, then the gearshift strategy is defined. The vehicle is simulated in the NEDC cycle with the GT-Suite Simulation software; then using the Kinematic Analysis and Design of Experiment (DOE) of the GT-Suite, by limiting the engine torque, engine speed, and throttle, 144 gear-shift maps will be produced. Finally, a gear-shift map with minimum fuel and energy consumption will be selected and optimized with gear change requirements for the WLTC cycle. The results show that even with the ideal gear-shifting map in the world cycle, carbon dioxide emissions, Fuel, and Energy consumption were increased by 32, 11, and 12.14% compared to the European cycle, respectively. Also, the reduction in engine speed reduces carbon dioxide emissions; overall, high engine speeds increase friction and worsen carbon dioxide emissions. So, in the world cycle, carbon dioxide pollutants are the most sensitive to the gear shifting strategy.