Wednesday, September 12, 2007

Lucky, my beloved car didnt give up on me...

Almost got into an accident today, lost control of the car, by going into oversteer when cornering. When i try to correct it, somehow the AYC and ACD took over the control and makes the car sway left and right when auto correcting the power to the wheel. As a result, almost hitting the roadside kerb. Luckily, in the end it is able to go straight.

AYC:
(right hand bend), by increasing the level of torque to the left rear wheel and reducing the torque level to the right wheel, it is possible to change the yaw movement of the vehicle. This in turn will cause the vehicle to steer inwards and reduce the amount of slip on the front tyres, thus resulting in reduced under-steer.

It also works if over-steer occurs, by reducing the torque level to the left hand rear wheel and increasing the torque level to the right hand wheel, again changing the yaw movement to reduce over-steer.

By controlling the amount of torque transmitted to the rear wheels when there is less traction, or a difference in grip on the road surface, AYC also works to improve acceleration and stability on slippery roads.

ACD:
The Active Centre Differential, first introduced in the Evo VII, is an electronically controlled hydraulic multi-plate clutch which distributes torque between the front and rear to improve traction under acceleration out of a corner. It works in conjunction with Active Yaw Control which enhances grip and steering response whilst driving through the bend itself. Using sensors, ACD regulates slippage in the 50:50 torque-split diff from free to lock-up according to speed and load. So under hard acceleration the ACD moves towards lock-up to put more torque down on the road for stronger traction, but with rapid steering inputs it operates virtually like an open differential to improve steering feel and response.

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