Not doubting your driving but it's extremely simple to activate VSCon dry pavement. All you have to do is go over a speed bump slow and accelerate while going over it. Another way is go up an incline slow while cornering at full steering lock.
It sounds like you are talking more so about TRAC than VSC. If you do as you say over the speed bump your rear wheels will 'pop up' tricking the 4R into thinking it is loosing traction, and it will throttle back (TRAC) with a flash of that on the dash. A straight line will NOT activate the VSC system. When the VSC system is activated you will get flashing icons on the dash (forget which one), BUT you will also get an audio beep from the 4R letting you know it just activated. I cruise over the speed bumps at the mall and grocery store and it has never happened to me.
I have to disagree with you on "VSC having more to do than just wheel spin" though. VSC exists to keep all wheels turning at a correct rpm. While there are many inputs into the VSC system there are only a few things that VSC will do to counter those inputs. 1) Is to use the braking system to slow down the offending wheel(s) spin by pulsing the brakes and 2)
Yes...and...No - TRAC exists to keep the wheel spinning at the same RPM's VSC exists to keep the 4R from spinning out and flipping over. Say for example you are going around a corner and hit some black ice with the 4R and the rear end starts to slide out, the 4R's sensors (These include a yaw rate sensor, a G-sensor and a steering angle sensor.) detect it and the 4R's essentially takes control give and will keep the vehicle from spinning out and possibly flipping over..... please read below for the full details.....(like you said, obviously it is not turning the front wheels, but it knows which direction they are pointed and takes that into consideration when making the throttle/braking corrections)
How Does It Work?
Sensors can detect that the vehicle is skidding sideways, and when this happens, Toyota’s Vehicle Stability Control system can apply braking force independently to any of the four wheels while automatically controlling engine output. Together, these careful adjustments help to prevent lateral skidding.
The VSC system electronically monitors speed and direction, and compares the vehicle's direction of travel with the driver's steering, acceleration and braking inputs. VSC can help compensate for loss of traction which can cause skids. It utilizes some components shared with the Anti-lock Brake System (ABS) and an electronically controlled engine throttle as well as a dedicated computer and sensors providing information to the VSC system. These include a yaw rate sensor, a G-sensor and a steering angle sensor. When VSC is active, a warning beep tone and instrument panel warning light indicate that the system is functioning. In many cases, VSC reacts well before the driver is aware of a loss of traction. As with other safety technologies, such as anti-lock brakes, it is important to drive safely, since Vehicle Stability Control cannot defy the laws of physics, nor can it provide more traction than exists in a given condition.
While VSC has revolutionized vehicle steering and traction control, it does have limits. The system cannot provide more traction than exists between the vehicle and the road surface, and it cannot prevent lateral skidding if the driver makes extreme steering actions.
Vehicle Stability Control is a revolutionary technology that has helped reduce the number of accidents dramatically by assisting drivers in controlling lateral skidding. In fact, the National Highway Traffic Safety Administration has found that passenger cars equipped with VSC are involved in 35% fewer car accidents than those without the technology. For SUVs, the difference is even more dramatic – those with VSC are involved in 67% fewer accidents.
Toyota became one of the pioneers in developing vehicle stability control systems in the late 1980s by examining how tanks are maneuvered. Through a revolutionary technology designed to control the right and left brakes separately, Toyota took a new approach to brake design that reduces the chances of lateral skidding.
Toyota featured its first version of the VSC system on the 1995 Crown Majesta.
VSC
