The autobox features an optional Geartronic manual mode, as is expected in a vehicle targeting the premium class. Its
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The autobox features an optional Geartronic manual mode, as is expected in a vehicle targeting the premium class. (Photo: Volvo Cars of Canada) |
electronically controlled, of course, and features a "W" on the console, representing a special "winter" mode that was ideal for the conditions outside. Basically, winter mode starts the car out in second rather than first gear, reducing the opportunity for wheel spin and therefore enhancing traction.
Traction control is part of the XC package, mind you, a truly sophisticated engine and brake managed system that makes the most of slippery situations.
Of course, traction control only enhances the sophisticated Haldex all-wheel drive system. In more detail, the technology incorporates a mechanical pump, control valve and wet multi-plate clutch in order to send drive power to the rear. While this might be a more mechanically technical description of its components than your personal education may have covered, suffice to say the various parts combine to instantaneously launch the car forward with only a fraction of an inch of slip. This is unlike
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An impressive traction control setup only enhances the sophisticated Haldex all-wheel drive system. (Photo: Volvo Cars of Canada) |
the majority of all-wheel drive systems offered, which allow significant slip prior to takeoff, a practice that is more prone to either getting stuck in one place or promoting lateral sliding.
How does it get power down to the rear wheels almost instantaneously? A small electrically-powered auxiliary pump pre-pressurizes the system so that power transfer happens quickly. Any sense of slippage causes a pressurized blast of oil to make a B-line to the wet clutch in the rear differential, temporarily melding the clutch plates and simultaneously sending power to the rear wheels. Hey, that almost sounded simple for a minute.