Performance analysis and optimization design of variant CR-CR 9-speed automatic transmission

Area of Science:

• Automotive Engineering
• Mechanical Engineering
• Vehicle Dynamics

Background:

• Increasing demand for fuel-efficient, comfortable, and eco-friendly automobiles drives innovation in high-gear automatic transmissions (ATs).
• Lack of systematic research methodologies has hindered advancements in high-gear AT development.

Purpose of the Study:

• To present a novel performance analysis and optimization method for high-gear variant CR-CR 9-speed automatic transmissions.
• To provide a theoretical foundation and technical support for improving and applying high-gear ATs.

Main Methods:

• Utilized the lever method to calculate transmission ratios, component speeds, and torques, deriving a general formula for transmission efficiency.
• Developed a scaled optimization algorithm to determine optimal transmission structures and speed ratio step values for enhanced performance.
• Employed 3D modeling and simulation to validate theoretical findings and the proposed efficient structure.

Main Results:

• Derived a general formula for transmission efficiency in high-gear ATs.
• Identified optimal transmission structure schemes and speed ratio step value ranges for improved efficiency.
• Validated the theoretical derivations and the feasibility of the optimized structure through simulations.

Conclusions:

• The presented method offers a systematic approach to analyzing and optimizing high-gear automatic transmissions.
• The findings support the development of more efficient and high-performing ATs, meeting automotive industry demands.
• This research provides a foundation for future improvements and preferred applications of advanced AT technology.