DAF launches revised CF and XF heavy trucks
UK market leader DAF has launched revised versions of its CF and XF heavy trucks, which offer increased payload and have new drivelines which are claimed to reduce fuel consumption by up to seven per cent. Service intervals have also been extended.
The major mechanical change is the switch to ZF’s TraXon automated gearbox, also to be found on new heavy MAN trucks. DAF has standardised on a 12-speed, with a 16-ratio version available as an option.
Revisions to the MX-11 and MX-13 engines include a new turbocharger, a new EGR system, and new valve actuation design. Pistons and injectors have been changed and compression ratios increased.
Parasitic losses have been reduced by the introduction of variable-speed cooling, steering and oil pumps.
Maximum torque on all engines but the highest output MX-13 is now available from 900 rpm, and high-ratio drive axles can be specified to allow cruising at 85 km/h at engine speeds as low as 1,000 rpm. Differential crownwheel and pinions have been revised to reduce noise and aid efficiency, while low-viscosity oils in smaller quantities and low-friction wheel bearings also reduce fuel consumption.
The trucks’ electronic architecture has also been renewed. Driveline management is now integrated; for example, the terrain-reading Predictive Cruise Control (PCC) and EcoRoll systems have been integrated, so EcoRoll can be active sooner, allowing the truck to freewheel for longer.
For instance, working together, on a downhill the two systems can now calculate whether the truck has sufficient momentum to carry it up to the summit of the next incline within a set speed bandwidth without re-engaging drive.
Performance of the Paccar engine brake has also been enhanced. On the MX-11 it now generates a maximum of 340 kW of braking power with a 20 per cent boost between 1,000 and 1,500 rpm. The MX-13’s brake has a maximum output of 360 kW, with a 30 per cent boost between 1,200 and 1,500 rpm.
Aerodynamic detailing on the big XF cab has been cleaned up, and a new more aerodynamic sun visor profile is shared with the CF.
A new compact exhaust aftertreatment system has been developed, with a 40 per cent reduction in volume over the previous design. DAF claims the more compact box does not inhibit engine efficiency: in fact, its faster warm-up allows the engine to switch to its most efficient fuel map faster and more frequently.
The reduced volume makes for a less cluttered chassis and around 50 per cent of the claimed 100 kg total weight-saving for the new trucks comes from the revised exhaust can.
Service intervals for the new trucks can be extended from 150,000 to 200,000 km, and the diesel particulate filter can run for up to 500,000 km between cleans.
The new trucks also incorporate the DAF Connect fleet management system first revealed at last year’s IAA Show.
Drivers will enjoy new cab interior trims and dashboards, a new climate-control and ventilation system and new interior lighting. A top-of-the range Exclusive Line trim option, with leather seats and steering wheel, is available.
Initial production starts in the summer of 4×2 and 6×2 tractors and rigids, with others to follow in the autumn.
Introducing the new trucks to the British market at the Commercial Vehicle Show, DAF Trucks president Preston Feight said they offered “the best possible solutions for both the customer and the driver”.
