Almost correct :wink:RSnyder said:The standard traction control simply cuts power to the front wheels when they spin faster than the rear wheels.
Further clarification. Traction control generally results in a combination of reduced engine power (selective cylinder shut off, spark retard, gear upshifts, or throttle retard) followed by hydraulic brake apply to the driven slipping wheels if needed to slow it to the target slip rate (maximum allowed wheel slip above the actual vehicle speed). It is necessary to allow some slip if the vehicle is accelerating, the same situation where negative slip is needed to achieve efficient antilock braking. This can be done on one or more driven wheels independently if the hydaulic brakes are used. The Pruis is front wheel drive, meaning only the front wheels can accelerate the vehicle through power application, thus traction control is performed only on the front wheels. Also, the Pruis drive system is rather unique, and as such the engine power reduction portion of traction control is partially achieved by reducing electric motor torque through the power split device.Victor said:Almost correct :wink:RSnyder said:The standard traction control simply cuts power to the front wheels when they spin faster than the rear wheels.
Traction control applies breaking to the driven wheels to stop a driven wheel from spinning, for exmple on ice. The driven wheel can be rear or (as in the Pruis) front wheel, or in the case of a 4x4 any wheel.
I was reading the window sticker for the car, I left it in my glove box. Where it says: Traction Control, right after it, it says: TRAC. So it might stand for both. Go to John's site: http://john1701a.com/index.html and on the left go to Prius Info, and the Window Sticker - N. It shows it there.RSnyder said:The abbreviation TRAC normally stands for Toyota Rent-A-Car, not traction control.