New Euro-V engines, revised transmission, and new chassis from Volvo Trucks

  • 01-May-2009 03:51 EDT
New engine range.jpg

Revisions to Volvo Trucks' Euro-V engines include lower compression ratios and an electrically controlled oil thermostat.

Following the revisions to the D16 16-L engine fitted to the Volvo FH16 truck to comply with the Euro-V emissions legislation, Volvo Trucks has announced changes to the remaining 7.0-, 11-, and 13-L engine ranges to meet Euro-V requirements. The changes are accompanied by revisions to Volvo’s I-Shift automated transmission and revisions to final drive ratios. The company has also introduced new axle configurations for rigid chassis.

The Euro-V engine range is scheduled to enter production in June.

Volvo claims that the Euro-V revisions have simultaneously increased power output and reduced fuel consumption by up to 3%. For the 13-L D13 engine, maximum power output has been raised by 20 hp (15 kW) to 540 hp (403 kW), while peak torque has risen by 100 N·m (74 lb·ft) to 2600 N·m (1920 lb·ft) at 1000 rpm. The changes mean that there are now five output options from the D13 engine: 380, 420, 460, 500, and 540 hp (283, 313, 343, 373, and 403 kW). Peak torque now spans the 1900 to 2600 N·m (1400 to 1920 lb·ft) range.

The Volvo FM series, fitted with a lower-mounted variant of the Volvo Trucks cab, is available with all D13 engine ratings except 540 hp. Similarly, the standard-mounted cab for the FH range is available with all power options except for 380 hp.

Modifications to the Euro-V D13 engine, compared with the Euro-IV variant, include a new piston bowl, cylinder liners, and piston rings. These changes result in a slightly reduced compression ratio. An electrically controlled oil thermostat has been introduced to control oil temperature better, and the engine also gains a two-speed coolant pump.

A turbocharger waste gate is used with all power outputs. Similarly, all variants gain a pilot injection pulse for the fuel injection system, said to reduce combustion noise by 2.0 dB(A). The selective catalytic reduction (SCR) muffler gains a revised catalytic coating.

The Volvo engine brake (VEB) will be available with two power outputs. The VEB, available as an option with 380- and 420-hp variants, will offer up to 300 kW (402 hp) of engine braking at 2300 rpm. The VEB+ will provide up to 375 kW (503 hp) of engine braking also at 2300 rpm.

The engine power take off (PTO) will provide up to 1000 N·m (738 lb·ft) of torque at a standstill or 650 N·m (479 lb·ft) while on the move. Oil change intervals are set at 100,000 km (62,100 mi) using VDS4 grade engine oil.

The Euro-V 11-L D11 engine, offered with the Volvo FM cab, will also be available with a broader range of power outputs: 330, 370, 410, and 450 hp (246, 276, 306, and 336 kW). Maximum torque spans 1600 to 2150 N·m (1180 to 1585 lb·ft). The engine is available with the VEB, which can deliver up to 290 kW (389 hp) of engine braking at 2400 rpm. The PTO offers the same outputs as the D13 engine and the same oil change intervals with VDS4 grade oil.

As with the D13 engine, the compression ratio for the D11 engine has been lowered slightly. The turbocharger is effectively the same as that used for Euro-IV variants but designed to handle the raised power output of the engine. An electrically controlled waste gate is used for the turbocharger for all power ratings. Like the D13 engine, an electrically controlled oil thermostat has also been introduced, along with a two-speed coolant pump and improved SCR muffler coating.

Both D13 and D11 engines are also available to enhanced environmentally friendly vehicle (EEV) standard.

The 7.0-L D7 engine is offered with the Volvo FL and FE cabs and gains more power ratings at Euro-V. There are now five ratings: 240, 260, 290, 300, and 340 hp (179, 194, 216, 224, and 254 kW). Maximum torque output spans 940 to 1300 N·m (693 to 960 lb·ft).

An engine brake is available as an option for all versions, offering up to 188 kW (252 hp) of engine braking at 2800 rpm. A maximum of 600 N·m (443 lb·ft) of torque is available from the PTO. Either VDS3 or VDS4 grade engine oil can be used to provide oil change intervals of 100,000 km.

The D7 common-rail fuel system uses the same injectors and pump as for Euro-IV, but the common-rail pressure mapping has been revised.

The Volvo I-Shift 12-speed automated transmission has also been revised for use with the new engines. New features are designed to reduce fuel consumption, improve traction, and offer more comfortable gear shifting.

The revised functions include an improved freewheeling mode, which is automatically activated when neither engine power nor engine braking is required. Drivers can also influence the gear-change pattern by indicating if the vehicle is heavily loaded or not. With a light load, the revised gear-changing pattern will reduce fuel consumption to that expected when the I-Shift is specified with the “Long haul and fuel economy” software package.

On slippery surfaces, a new option is designed to improve traction. The option is called, “Enhanced performance–poor roads.” This will ensure gear changes are made at higher engine speeds while fewer gear shifts are used. The objective is to avoid power loss in driving and reduce the risk of wheel spin with the application of torque after a gearshift. Drivers can also avoid an upshift if not required by pressing a button on the shift selector.

This program starts off at higher engine speeds to improve starting torque. Another function speeds up clutch release and makes it easier to rock the vehicle out if it gets stuck in soft ground. Multiple downshifts are also possible in this mode to make driving on steep gradients easier.

Volvo has also introduced an expanded range of air-suspended axle bogies and front axles. Among these is the Volvo 8x4 “Tridem,” a factory-fitted, three-axle, air-suspended bogie with a steered tag axle. Three axles and a short rear overhang are designed to provide good stability and grip in difficult conditions, while the steered tag axle and short wheelbase is designed to offer good maneuverability.

For a vehicle with a 32-t (35-ton) gross weight, 3.9-m (12.8-ft) wheelbase, and steered tag axle, Volvo claims a turning radius of 7.8 m (25.6 ft). The chassis can provide bogie loads up to 32 t and gross weights up to 42.5 t (46.8 ton).

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