The application of electric traction motors in combination with internal combustion engines has the benefits of improved fuel economy, reduced emissions and enhanced driving performance. These benefits are also availavble to medium-duty commercial trucks, which operate on driving cycles that are appropriate for the energy improvements available from placing an electric motor in the driveline. There are several types and variations of Hybrid Electric Powertrains. Most of the systems that are being proposed for application to commercial trucks have similar operating features. An electric traction motor provides power to the vehicle driveline, in combination with the traditional internal combustion engine. Commercial vehicles typically use compression ignition engines, operating on diesel fuel. The traction motor requires a large amount of electric power, usually provided from direct current (DC) batteries through an inverter, which controls the torque and speed of the motor by switching the DC voltage on and off at high frequencies. The electric traction motor is capable of supplying power from the batteries to the driveline, and of absorbing power from the driveline by re-charging the batteries. The same traction motor (or in some cases, a separate device) can also convert mechanical power from the engine into electrical power for recharging the batteries, driving the traction motor, or providing alternating current (AC) power for auxiliary equipment. All of these elements and functions are coordinated by a central Powertrain Management Control Unit. Medium-duty trucks will benefit from the addition of Hybrid Electric Powertrains, but there are a number of concerns and issues that need to be addressed for successful implementation. System performance is more difficult than in cars, because the truck manufacturer integrates major components from several independent suppliers, who need to collaborate much more during the hybrid development process to ensure that the system will meet expectations. Some of the new system components have high-power electrical considerations, which need to be addressed in the process of developing and maintaining the new commercial vehicles. The buying behavior in the commercial vehicle market is different from the passenger vehicle market, which means that the added cost and capability of the Hybrid Electric Powertrain system is going to have to demonstrate measurable benefits. Truck buyers judge value more from a financial pay-back perspective than automobile buyers, so the fuel savings and performance benefits of Hybrid Electric Powertrain systems need to be showcased, to demonstrate that they can justify the purchase price.
Application of hybrid electric powertrains to medium duty trucks
2001
6 Seiten, 4 Bilder, 3 Quellen
Conference paper
English
Application of Hybrid Electric Powertrains to Medium Duty Trucks
British Library Conference Proceedings | 2001
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