Modification of a Hybrid City Bus Powertrain in the Aspect of Lower Fuel Consumption and Exhaust Emissions

Abstract

In this paper the authors present the methodology and results of exhaust emissions and energy consumption tests of an 18-meter city bus fitted with a serial hybrid drive. During the tests, parameters of the engine operation, capacitor charging level and exhaust emissions were recorded. The tests were performed under actual conditions of the bus operation in city traffic on a regular bus route. The testing cycles were conducted twice on the same vehicle. The first cycle was performed on the bus with the original configuration and the second one - on the optimized engine and drivetrain. The paper presents the results of the conducted investigations and a comparison that tells us whether the optimization changes have a positive influence on the vehicle reducing its energy consumption and exhaust emissions.