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Scania utilizes gravity to save fuel


kscarbel2
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Södertälje / October 2, 2013

Scania has introduced “Eco-roll”, an advanced system that can lower customer fuel costs up to two percent. The Eco-roll system calculates when a truck should use gravity to roll in neutral downhill.

Scania Eco-roll is standard on long-haul trucks when ordered with Scania’s "Opticruise" automated manual transmission (AMT) and "Active Prediction" cruise control system, two-pedal system and Euro-6 (near EPA2010) engine.

The Scania Eco-roll system calculates which is the most fuel efficient, whether to roll down hills with the transmission in neutral and the engine idling or to use engine braking with the fuel supply switched off.

Choosing which is the most fuel-efficient – to cruise down a hill in neutral or under engine braking – is not as obvious as it may sound. Scania Active Prediction makes the calculation automatically. If the system chooses Eco-roll in order to make use of the kinetic energy, then the objective is to roll downhill in neutral for at least ten seconds since shorter sessions would be less useful. At the same time the speed should not be so high that engine braking is engaged, since this negatively affects the fuel energy already transferred to the engine.

Scania Active Prediction uses both GPS (for positioning) and topographic maps to control speed. Depending on which performance mode drivers select, the truck utilizes a number of strategies to either use as little fuel as possible or to optimize a high average speed.

A further development of Scania Active Prediction is that the system is now even better at optimizing gear changing strategies. By analyzing how much remains of an uphill gradient, unnecessary gear shifting can be avoided by utilizing the low-rev torque advantage of Scania engines.

http://www.scania.com/products-services/trucks/main-components/transmissions/transmission-technology/scania-opticruise/index.aspx

http://www.scania.com/products-services/trucks/safety-driver-support/driver-support-systems/active-prediction/

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