L-ai cam jignit cu controlul tracțiunii.
Se pare ca e al stabilității:
How VDC Works
The VDC control module monitors various sensors (wheel speed, yaw rate, lateral-g) and evaluates the data to determine the vehicle’s direction. At the same time, the VDC control module receives driver inputs indicating steering angle and brake pressure to determine the driver’s intended direction. If there is a discrepancy between driver input and vehicle direction, VDC applies a corrective measure.
To correct understeer (front wheels don’t follow intended path), VDC applies braking force to the inside rear wheel. This counter-action pivots the car around the braked wheel and helps put it back on the driver’s intended course. At the same time, VDC optimizes All-Wheel Drive control by decreasing transfer clutch engagement to reduce power at the front wheels.
To correct oversteer (rear end slides out), VDC applies braking force to the outside front wheel. This counter-action pivots the car around the braked wheel to help bring the rear of the vehicle back in line. At the same time, VDC optimizes All-Wheel Drive control by increasing transfer clutch engagement to transfer more power to the front wheels. During an emergency lane change, for example, the quick change in direction could induce both understeer and oversteer. VDC responds by making continual adjustments to optimize stability and control.
VDC Advanced Logic
The Subaru VDC system responds to the varied conditions a driver might encounter on both dry and slippery surfaces. During straight-line acceleration, VDC controls engine output and braking of individual wheels (through TCS) and VTD All-Wheel Drive transfer clutch operation. During straight-line braking, the ABS function controls the braking action and the All-Wheel Drive transfer clutch operation.
Responding to oversteer with throttle depressed, VDC will:
Apply a strong brake force to the outer front wheel
Apply a slight brake force to the outer rear wheel
Increase transfer clutch engagement to transfer power to the front
Reduce engine output
Responding to oversteer with the brakes applied, VDC will:
Reduce brake force on the inner front wheel
Reduce brake force on the inner rear wheel
Increase brake pressure on the outer front wheel if the brake force applied by the driver is insufficient (in addition to the previous two steps)
Responding to understeer with the throttle depressed, VDC will:
Apply a slight brake force to the inner front wheel
Apply a strong brake force to the inner rear wheel
Reduce transfer clutch engagement to reduce power at the front wheels
Reduce engine output
Responding to understeer with the brakes applied, VDC will:
Reduce brake force on the outer front wheel
Reduce brake force to the outer rear wheel
Increase the brake force on the inner front wheel if the brake force applied by the driver is insufficient (in addition to the first two steps)
Increasing straight-line stability, VDC will:
Activate the centre differential clutches and lock the centre differential to stabilise the vehicle once it is driving in a straight line after a sharp steering manoeuvre. This takes advantage of the tendency for a vehicle with a locked centre differential to go straight.
Limited-Slip Rear Differential
For even greater traction capability, Subaru equips the 2005 Legacy 2.5 GT and all 2005 Outbacks with a viscous limited-slip rear differential. If one rear wheel starts to lose traction, the differential automatically diverts power to the other wheel. A limited-slip differential not only enhances traction on slippery road surfaces, but it is also a handling aid. For example, as the car enters a curve and weight transfers to the outside wheel, the inside wheel can lose traction. The limited-slip differential would, in this case, maintain the inside wheel’s speed making the vehicle more stable.
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