Will the CVT gearbox run into the mountains?

12/06/2021

case study

Test a Teana, the model is 2015 2.0L+CVT, old car, ran close to 60,000 kilometers

Short distance mountain road driving, the intensity is only half of the ordinary mountain road running, the throttle Give a little too much, the whole acceleration process is not much, because after all is not a performance car, measuring the limit of the problem is more convergence, but after the end of the mountain road into the main road about 5 minutes after the red light in the small slope road, the car suddenly appeared stutter, and then appear to step on the gas pedal after the car speed does not increase. At that time, it had stepped on nearly 4000 rpm, but only maintained less than 30 km/h.

At that time, I only thought there were two things going on. One is that the transmission is bad, and the other is that the transmission is protected. After trying several times to step on the gas pedal to shift to P gear or no better, I decided to turn off the engine and restart, and that's when it returned to normal.

CVT is not suitable for running mountain roads?

First of all, here's how CVT transmissions work. CVT transmission is called CVT continuously variable transmission. It relies on the steel belt and cone wheel, and the speed ratio changes through the radius change of the steel belt constantly sliding on the cone wheel, which is the same as AT stepping on the stairs and CVT sitting on the slide, constantly changing the speed.

Because it only relies on the friction of the steel belt to complete the speed ratio, the problem of slippage definitely exists. Although there is an anti-slip program, it is still inevitable, especially when I run on mountain roads. This is when the big foot on the gas pedal, which is the performance of slippage.

to sum up

Both AT and dual-clutch gearboxes can achieve rapid and continuous downshifts to ensure deceleration. The reason why CVT gearboxes are most unsuitable for mountain running is that they can’t downshift quickly.

CVT gearboxes are now basically used in some models that emphasize economic comfort. Because of the good ride comfort, as long as there is no skidding, there will be no setbacks. It is positioned for daily driving in the city.