Start/Stop Strategies for Two-Wheelers in the Emerging Markets 2013-32-9125
Fuel economy of two-wheelers is an important factor influencing the purchasing psychology of the consumer within the emerging markets. Additionally, air pollution being a major environmental topic, there is a rising concern about vehicle emissions, especially in the big cities and their metropolitan areas. Potentially, the relatively expensive engine management systems are providing more features and value in comparison to the carburettor counterpart. The combustion system analysis is carried out on a 125 cm3 motorcycle engine and the subsequent numerical simulation comparing the carburettor and the Electronic (Port) Fuel Injection which provides a basis to establish the fuel consumption benefit for the electronic injection systems .
In order to add more flexibility to the engine management systems and provide additional fuel economy benefit the following strategies were numerically simulated and later validated on a chassis dynamometer:
Start/Stop: Engine is switched off at a stop while neutral gear is selected.
Stop-in-gear: Engine is switched off at a stop in any gear.
Idle Coasting: Engine is idling but disengaged from the transmission during coasting.
Start/Stop Coasting: Engine is switched off and decoupled from the transmission during coasting.
Simulation and dynamometer measurements are obtained based the same implementation of test cycles, which are, the Indian Drive Cycle (IDC) and the World Motorcycle Test Cycle (WMTC), urban part 1. Both cycles represent urban driving patterns, which are very common for two-wheeled transportation within the dynamically growing cities of the emerging markets. The resulting fuel efficiencies were compared to a stock bike configuration - a motorcycle without any of the above mentioned Start/Stop strategies, but with Electronic (Port) Fuel Injection.