Research on the development trend of new energy automobile transmission

Single-gear transmissions are commonly used in transmission systems for new energy vehicles (including pure electric vehicles, hybrid vehicles, etc.). The single-speed transmission has a simple structure, low cost, and high transmission efficiency. The single-speed transmission consists of a two-stage gear transmission in which the second-stage gear drive integrates the differential. In recent years, two-speed transmissions, coaxial transmissions, transmissions with integrated electronic disconnect differentials, transmissions with integrated dual clutch differentials, motor controller transmission three-in-one assemblies, and transmissions with integrated engine motor generators have emerged. New transmissions.

1 two-speed transmission

Compared with the single-speed transmission with a reduction ratio of 9-10.5, the two-speed transmission has a low-speed reduction ratio of 11-12, which satisfies the acceleration and climbing performance, and the required maximum motor torque can be reduced; The ratio is set to 5-9, which meets the maximum speed requirements, and the maximum motor speed required can be reduced. The motor's maximum torque and maximum speed are reduced, which makes the motor smaller and lighter. Moreover, the two-speed transmission allows the motor to operate at the optimum efficiency point, reducing fuel consumption.

3 Integrated transmission with electronic disconnect differential

At high speeds, the electronic disconnect differential separates the motor from the wheels to increase system efficiency at high speeds and prevent motor overspeed. The electronic disconnect differential controls the engagement or disengagement of the dog clutch and the Hall sensor is used to measure the clutch position non-contact.

4 Transmission with integrated dual clutch differential

The dual clutch system replaces the traditional differential to precisely adjust the torque of each wheel for left and right wheel torque vector control. Achieve torque limit and realize electronic limited slip differential lock function. Improve system efficiency when disconnected.

5 two-speed coaxial transmission with dual clutch differential

The transmission combines the characteristics of the above three-speed, coaxial, and dual-clutch differentials

6 motor controller transmission three-in-one assembly

The three-in-one assembly has a compact structure, high power density, high system efficiency, simple installation, and reduced cable, providing an overall solution.

7 Transmission with integrated engine motor generator

Realize the switching between pure electric, series hybrid, parallel hybrid, hybrid hybrid and other modes, improving vehicle performance and efficiency.