Abstract
Plug-in hybrid electric vehicles are developed in order to reduce the fuel consumption and the emission of carbon dioxide. Besides the series, parallel and power split configurations are commonly used for conventional hybrid electric vehicles, and multimode transmissions are used for plug-in hybrid electric vehicles, which are able to switch between different modes like parallel or series operation of the combustion engine and electric motor. Several concepts have already been discussed and presented. These concepts comprise novel structures and multi-speed operation for the combustion engine and the electric motor, respectively. For improving the fuel and energy consumption, model-based optimizations of multimode transmissions are performed. In the first step of the optimization, the optimal number of gears and transmission ratios, as well as the corresponding fuel and energy savings, are estimated. Based on these results, a new multimode transmission concept with two-speed transmissions for the combustion engine and the electric motor has been developed. The knowledge of the concrete concept enables the further optimizations of the transmission ratios and the transmission control. In order to prove the benefit of the new and optimized transmission concept, powertrain simulations have been carried out. The new powertrain concept is compared to a powertrain concept with single-speed transmissions for the internal combustion engine (ICE) and electric motor operation. The new transmission concept enables a significant improvement of the fuel consumption.
Highlights
Today, vehicle manufacturers are forced to reduce the fuel consumption of their products because of enhanced environmental regulations
The new powertrain concept is compared to a powertrain concept with single-speed transmissions for the internal combustion engine (ICE) and electric motor operation
A promising solution is the development of plug-in hybrid electric vehicles (PHEV), as they combine an extended electric cruising range and the possibility to propel the vehicle by an internal combustion engine (ICE) when the battery is depleted or when high performance is required
Summary
Vehicle manufacturers are forced to reduce the fuel consumption of their products because of enhanced environmental regulations. Each operation mode conforms one of the common powertrain configurations and the capability of switching them during the vehicle operation will combine the advantages of the available powertrain configurations These so called multimode or dedicated hybrid transmissions (DHT) are optimized for the application in PHEVs. Compared to add-on solutions, where the electric motor is added to a conventional automatic transmission, DHTs are less complex (less speeds) and the electric motors. Depending on the where the electric motor and connected to the final transmission drive by means of fixed transmission state of the clutch, the transmission enables a series hybrid mode, a parallel hybrid mode, an electric ratios.
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