A series hybrid city bus with diesel engine and electric batteries is studied on a specified route. The study uses two different basic control strategies, “On/off” and “Continuous” strategy. These basic strategies are complemented in two ways. First, an “Adviser” strategy which filters the driver commands and gives driver support feedback based on the route data. Second, an “Adapter” strategy, which adapts the control to the route, using different control depending on the present position of the vehicle. Simulation results are presented. They show that the adviser and adapter strategies improves both emissions and fuel consumption. As an additional study, the advisor concept was tested on a conventional diesel bus with an automatic traansmission.

A series hybrid city bus with diesel engine and electric batteries is studied on a specified route. The study uses two different basic control strategies, “On/off” and “Continuous” strategy. These basic strategies are complemented in two ways. First, an “Adviser” strategy which filters the driver commands and gives driver support feedback based on the route data. Second, an “Adapter” strategy, which adapts and the control to the route, using different control depending on the vehicle present position. Simulation results are presented. They show that the adviser and adapter strategies improves both emissions and fuel consumption.

Many new vehicle propulsion concepts aim for lowering fuel consumption and emissions. Simulation is an efficient tool for design of such systems. An electric series hybrid city bus, driven on a specific route, is used as a case study for involving simulation in the design process. The first objective of this work is to verify models for transport task and driver. The second objective is to optimize the energy storage size with respect to fuel consumption, emissions and performance. The third objective is to evaluate the optimized hybrid bus. Comparisons are made with a conventional bus.

Problems concerning energy consumption and emissions in urban areas are well known and have received a great deal of attention. This paper focuses on one specific automotive area: city bus traffic. One promising way to control emissions from city buses is to use hybrid propulsion systems. A hybrid vehicle has a obvious potential to limit fuel consumption and undesired emissions compared to a tradi- tional one. The vehicle studied is a series electric vehicle where the power from a diesel en- gine is transferred via an energy storage. The vehicle is driven along a specified route. This study uses two different basic control strategies. These strategies are complemented in two ways. First, an "Adviser" which filters the drivers command and/or gives the driver support feedback. Second, a kind of adaptation to the route is made. This is carried out by using dif- ferent control depending on the position along the route. Simulations using mathematical models give levels of emissions and fuel consumption. An improvement in these aspects are achieved by adapting the control and by using the described "Adviser".