Three new longer tractors from DAF14 June 2021

Left to right: XG+, XG and XF

DAF has launched three new tractor models partly in response to the European Commission’s introduction of new masses and dimensions regulations that offer new design freedom.

The New Generation XF features a full new cab design with a 160 mm elongation at the front to improve aerodynamics, as well as a 75 mm lower cab datum compared to the current XF Super Space Cab and Space Cab. In combination with a large windscreen and ultra-low belt line, this improves direct vision.

In addition to the XF, DAF is introducing the XG and XG+, creating a new top-class market segment, which takes maximum benefit from the new masses and dimensions regulations. Next to the 160 mm elongated front, both flagship models feature no less than 330 mm extra length at the rear of the cab for more working space. The cab datum of the XG and XG+ is 125 mm higher than the New Generation XF. With a volume of 12.5 m3, the DAF XG+ has even 14% more volume than the current DAF XF Super Space Cab.

In addition to external aerodynamics, DAF has also adjusted engine compartment and under cab airflows. These include closures around the charge air cooler and the radiator, flow guides and recirculation barriers and closed wheel bay covers. All this has resulted in no less than 19% better aerodynamics and up to 6.3% out of a promised 10% fuel efficiency improvement.

New engine and after treatment technologies as well as sophisticated thermal management result in up to 3% additional fuel efficiency gain from the 10% overall improvement. The New Generation DAF XF, XG and XG+ are equipped with new powertrains, featuring new engine and transmission technologies and rear axle innovations. Combustion of the 10.8 litre PACCAR MX-11 and 12.9 litre PACCAR MX-13 engines has been optimised through the use of new injectors, a new cylinder head and block – allowing higher cylinder pressures – and a new design of pistons and liners. A new generation of efficient turbocharger is utilised for best air management and new air compressors, oil pumps and alternators ensure parasitic losses are reduced to a minimum. The exhaust after-treatment system is redesigned to achieve the shortest route from engine outlet to EAS-inlet for absolute minimum exhaust temperature loss for highest efficiency.

There are torque increases of 50 to 100 Nm in direct drive top gear. The top-rated 523bhp version now offers 2,550Nm in every lower gear and 2,700Nm in top gear. The new generation HE400 turbocharger improves air management, with maximum torque now available at 900 rpm, even for the MX-13 engine. In addition, the engine brake delivers up to 20% more torque at lower revs.

Full-electric and hydrogen-powered variants are promised at a later date.

Low vehicle weights (kerb weight of the New Generation XF 4x2 tractor in its most representative specification is only 6,912 kilogrammes) and enhanced driver assistance systems (Predictive Cruise Control 3 with extended EcoRoll functionalities and Preview Downhill Speed Control) bring the total efficiency gain up to 10%. The new models are equipped with a TraXon automated gearbox as standard, featuring new technologies like automatic drive-off gear selection, enhanced predictive features and (optional) urge-to-move. For maximum driveline efficiency, rear axles with reduced oil levels and new pinion bearings are employed. A new generation of brake callipers results in less frictional losses and a lower weight.

Because of the 160 mm longer cab front, a new chassis design was required. Newly designed and stiffened cross members and a new aluminium front underrun protection result in torsion stiffness and low weight (-/- 38 kilogrammes). In addition, the rear axle suspension has been redesigned to include a new geometry as well as a new fifth wheel position, resulting in an extended wheelbase (4,000 mm) for the XG and XG+.

Servicing arrangements have changed too. First, DAF introduces over-the-air-updates for the engine and after-treatment systems, the vehicle ECU, the Central Security Gateway (CSG) and DAF Connect. Uptime is also supported by service intervals of up to 200,000 kilometres. For long distance haulage, a long-drain option is available. This means for all on-road applications a service interval of once a year, said to be unique in the industry.

To improve direct vision, the New XF, XG and XG+ all feature a large windscreen (2.3 m2). As an option, on the co-driver’s side, a Kerb View Window is available, which – in combination with the new foldable co-driver seat – improves view of, for instance, pedestrians, cyclists and children next to the truck.

A new optional feature is digital mirrors. The DAF Digital Vision System replacing the main and wide-angle mirrors. Additional features include auto panning (following the rear of the trailer while cornering) and display overlays for additional information on the length of the vehicle, which is helpful for example when manoeuvring and overtaking. Even under extreme weather conditions, the heated cameras provide a clear view. As an industry-first, the cameras are electrically retractable.

In addition, the DAF Corner View is an option to replace the kerb and front view mirrors and which exceeds the field of vision of these conventional mirrors.

Safety devices onboard include brake assist, lane departure warning system and emergency brake lights. The latest version of Advanced Emergency Braking System (AEBS-3) can provide up to full autonomous emergency braking to assist with collision avoidance of both stationary and moving vehicles from a speed of up to 80 km/h. City Turn Assist system detects other road users or objects at the co-driver side.

Other optional systems include the new DAF Electronic Park Brake, engaging the brakes automatically when the engine is switched off. Low Speed Trailer Brake activates the trailer brakes independently for safe trailer coupling and decoupling. Park Brake Assist engages all brakes along with the park brake to ensure that the truck does not move during loading or unloading with a crane, or whilst operating a tipping body.

DAF will start series production of 4x2 and 6x2 tractor and rigid offerings of the new trucks in late 2021.

Transport Engineer

Related Companies
DAF Trucks Ltd

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