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Controlling gear engagement and disengagement on heavy trucks for minimization of fuel consumption

There is a potential to save fuel for heavy trucks by storing kinetic energy in the vehicle when driving downhill, because the speed adds kinetic energy to the vehicle which can be used after the downhill slope to propell the vehicle. This behavior can be even more utilized by disengaging the gear to reduce the friction in the driveline and thus increase the speed even more. Two di erent control strategies to choose when to disengage the gear is presented: One that uses instantaneous inclination and one predictive control scheme that uses look ahead information of the road topology. Simulation results show that gear disengagement in downhills can reduce the fuel consumption about 3%.

Anders Fröberg, Lars Nielsen, Lars-Gunnar Hedström and Magnus Pettersson

IFAC World Congress, 2005

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