crazymjb

Alright. I know the car can brake either of the four wheels to help with steering. I also know that the car can brake one wheel to feed power to the other through the differential to help one get out of ice or snow. What exactly is the VSA. Is that the entire thing, or is that just the front two wheels for ice+rain traction? Is there a different Electronic Stability Program? What about traction control?

rets

First of all, 3GTL isn't AWD yet, the "power" won't be delivered or separated from one wheel to another.

Bascially, VSA uses 4 wheels' brakes to help control the 3GTL in additional to ECU/DBW controls the torque from the engine.


Then, you could read this below.

VEHICLE STABILITY ASSIST (VSA)

The TL is equipped with 4-channel VSA that helps the driver retain control of the car in the event the vehicle reaches its dynamic traction limits, for example through aggressive cornering, encountering ice or dirt on the road, or entering a decreasing-radius corner too fast.

In the event of understeer (where the front tires lose grip), the system applies the inside front and rear brakes to increase yaw (vehicle "rotation"), slowing the vehicle and enabling it to complete the turn. Engine torque may also be reduced by coordination of the Drive-by-Wire Throttle System and Engine Controller.

The 4-channel system controls all four brakes independently. In the event of oversteer (where the rear tires lose grip), the system applies the outside front and rear brakes to decrease yaw, slowing the vehicle and enabling it to stay on its intended path.

An indicator light on the instrument panel alerts the driver whenever the VSA system is actively enhancing the vehicle's stability.

TheTraction Control System (TCS) component of VSA uses sensors that monitor each of the wheels and a computer-controlled modulation of engine power and front brakes to help prevent wheel spin when starting out or accelerating. If the sensors detect wheel spin, TCS reduces engine power and applies brake force to the affected wheels. This helps the TL maintain traction during acceleration and helps the driver retain steering control, even when accelerating on slippery surfaces.

A cockpit switch is provided to disable the vehicle stability and traction control aspects of the system while leaving the ABS system fully functional.


Plus, 3GTL also has Electronic Brake Force Distribution, Brake Assist, and ABS in conjunction with VSA/TCS.

crazymjb

Thanks. I know the power isnt seperated. The TCS is what I was reffering too. The differential is designed to give power to the wheel that is easier to turn, which would, in the real world, be the wheel on ice. If that wheel was to spin really quickly while the one with grip sat on a say, non icy patch of ground, the TCS would apply brake pressure to that wheel, thus causing the differential to give the power to the wheel on the ground. I am pretty sure the TL does do this.