Through a combination of new software and hardware upgrades for Euro 3 to 5 markets, Volvo Trucks’ updated D13 diesel engines can save up to three per cent in fuel in long-haul operations.
The new function is called Volvo Torque Assist and is intended to reduce fuel consumption by providing more efficient driving when the cruise control is disabled in long haul operations. Volvo Torque Assist is designed to give more fuel-efficient driving by automatically adapting the truck’s torque and acceleration to the road topography, the load and speed changes. The function is only active when driving without using cruise control. Another supporting function keeps the amount of injected fuel constant after the engine’s ‘green range’ has been passed. The slightly compromised performance is compensated by improved fuel economy.
The pedal map has also been recalibrated. A less sensitive pedal creates a smoother torque development, which, in turn, makes the truck easier to control. Drivers that are less skilled in economical driving benefit more than those who already have that driving style. The new software also gives a more significant result with heavy loads, many slope changes or large speed variations, while drivers transporting lighter loads with constant speed on flat roads will save less fuel.
The hardware upgrades in the Euro 6 Step D versions of the D13 engine, released earlier in 2019, are also being used to raise the standards of the Euro 3 to 5 engines. Internal friction has been reduced with new cylinder liners and new V-shaped oil scraper rings. The turbo efficiency has been improved and the engine management system is upgraded to a newer version with better capacity. In all, these hardware upgrades save around 1% fuel, while the fuel saving potential for the new software depends on driver experience and the operating conditions. Source