The difference between ecvt and cvt

ECVT is a hybrid gearbox with integrated motor. Its structure is completely different from CVT, but theoretically it can realize stepless gearbox, so it is explained in the same English.

The full spelling of CVT is continuously variable transmission. Three words mean: continuous, variable/variable, transmission. Together, it means continuous transmission Compared with the traditional AT, CVT can be understood as continuously variable transmission, so it is interpreted as continuously variable transmission in Chinese. Theoretically, a gearbox without a fixed transmission ratio can also be called this.

The difference between ecvt and cvt

First, structural differences.

The structure of CVT is mainly composed of two groups of pulleys (driving pulley and driven pulley) and transmission belt (steel belt), oil pump, hydraulic torque converter, actuator (valve body and oil circuit), sensor and control computer. The composition is complex and the steel belt bears limited torque, so it can only be used as the transmission system in small vehicles.

The structure of ECVT is much simpler. It is not as complicated as the clutch, torque converter or gear shaft group in the traditional gearbox system, but consists of a group of planetary gears and two motors.

Second, the working principle is different.

In CVT technology, No.2 motor is used as starting, low-speed drive and hybrid drive; 1 motor is mainly used to start the engine and generate electricity. In most cases, the engine does not directly drive the wheels. Connect the planetary carrier of the engine. 1 motor is connected to sun gear, No.2 motor is connected to external gear ring, and external gear ring is connected to power output shaft.

ECVT not only transmits power, but also couples the energy of engine and motor to realize power output. Therefore, it is actually a power combination system, which is a power distribution mechanism specially matched with hybrid electric vehicles. So it is also called PSD (power shunt device). The official definition given by Toyota is "power distributor", not "transmission".

Third, the power supply scheme is different.

ECVT is the electric transmission mechanism of Toyota's strong hybrid power scheme, which consists of two motors and a set of planetary gears. It can realize electric drive, stepless speed change and energy recovery.

CVT refers to an ordinary mechanical continuously variable transmission.