First, structural differences.
1 and CVT are 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 complicated, and the steel belt bears limited torque, so it can only be used as a transmission system in small vehicles.
2. The structure of 2.ECVT is much simpler. It has no complicated mechanism such as clutch, torque converter or gear shaft in traditional gearbox system, but consists of a group of planetary gears and two motors.
Second, the working principle is different.
1, CVT technology, No.2 motor as starting, low-speed drive, hybrid drive; 1 motor is mainly used to start the engine and generate electricity. In most cases, APP engine does not directly drive the wheels. The engine is connected with the download star carrier, the 1 motor is connected with the sun gear, the No.2 motor is connected with the outer gear ring, and the outer gear ring is connected with the power output shaft.
2.ECVT not only transmits power, but also couples the energy of engine and motor to realize power output, so it is actually a power combination system and a power distribution mechanism specially matched with hybrid electric vehicles.
Third, the power supply scheme is different.
1 and ECVT can also realize stepless speed change through integrated motors. This gearbox structure includes planetary gear sets and two motors, and there is no clutch or hydraulic torque converter. The motor is used to couple and provide the power output of the engine. ECVT is actually not a transmission element, but a power element, or rather a power distributor.
2.CVT refers to an ordinary mechanical continuously variable transmission.
The above contents refer to Baidu Encyclopedia -CVT and Baidu Encyclopedia.