VOITH Launches Two Hybrid Systems
2008-08-13 Source：english.chinabuses.com
Voith has developed the DIWAhybrid based upon the proven DIWA technology and supplemented it by an asynchronous motor. The strength of this parallel hybrid lies in its universal suitability, especially for applications in buses with higher average speeds. In heavy city traffic, Voith relies on the serial hybrid solution ElvoDrive. The core component for both solutions is an inverter especially developed by Voith for hybrid applications in buses.
Building upon its unique experience and the combined know-how in mechanics, electrics and electronics, Voith is able to offer two hybrid systems. One of them is the DIWAhybrid, combining the proven features of the DIWA transmission with an electric drive. The parallel hybrid utilizes well-known DIWA advantages, such as the power split principle in the starting range, the secondary retarder and the proven E 300 electronics with the diagnosis software ALADIN. These features are added by a low-loss asynchronous electric motor, which supports the diesel engine during starting and accelerating.
During braking, the asynchronous motor turns into a generator and acts as a primary retarder, which ideally supplements the DIWA secondary retarder. As a result, the service brake is protected and brake wear with its associated emissions of fine dust particles is reduced to a minimum. The DIWAhybrid is particularly effective in bus applications with higher average speeds.
The second one is the ElvoDrive, a serial hybrid system. Here, the required power is transmitted purely electrical, as with all serial solutions. The efficiency of the components is therefore of elementary importance. This is why the ElvoDrive relies on the Voith TFM technology (TFM = transverse flux machine) for both the generator and the electric motor. With its extremely high efficiency across a wide range, the TFM provides the conditions for an efficient overall system and consequently the reduction of power consumption and emissions.
The ElvoDrive generates maximum benefits in heavy city traffic with lower average speeds. Both systems have in common the Voith-developed inverter, ensuring reliable and stable energy management and providing the operator with maximum flexibility when it comes to specifying energy storage systems.
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