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The Necessity and Technical Challenges of Multi-speed Transmissions for Electric Vehicles
- Categories:Industry News
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- Time of issue:2016-04-21 14:05
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(Summary description)In addition to mileage concerns, charging and cost issues, the challenge of developing electric vehicles in the future will be to provide the same drivability as traditional power vehicles, including starting performance, high-speed cruising, and hill starting performance.
The Necessity and Technical Challenges of Multi-speed Transmissions for Electric Vehicles
(Summary description)In addition to mileage concerns, charging and cost issues, the challenge of developing electric vehicles in the future will be to provide the same drivability as traditional power vehicles, including starting performance, high-speed cruising, and hill starting performance.
- Categories:Industry News
- Author:
- Origin:
- Time of issue:2016-04-21 14:05
- Views:
Information
In addition to mileage concerns, charging and cost issues, the challenge of developing electric vehicles in the future will be to provide the same drivability as traditional power vehicles, including starting performance, high-speed cruising, and hill starting performance. Multi-speed transmissions will achieve these performances. A valid path. In addition, the multi-speed transmission can give full play to the efficiency of the drive motor (increased by about 10%), thereby reducing the requirements for battery capacity and motor power.
However, some people believe that single-speed transmission (reducer) has obvious advantages, such as simple system, high comfort (because no gear shifts are required), low cost and limited efficiency improvement of multi-speed transmission, only 1-2% , Maybe even reduce efficiency. In addition, the development of multi-speed transmissions is not an easy task. The additional weight, system complexity, cost, shift shock and HVH are all challenges to the development of multi-speed transmissions.
Is the multi-speed transmission of electric vehicles necessary? Is it just icing on the cake, or even superfluous? As the production of electric vehicles continues to grow rapidly, the debate on this issue is shifting up a gear. In addition, what are the feasible technical solutions for multi-speed transmissions, what are the technical challenges, and how to solve them? These may be the issues that professionals in the industry are more concerned about.
In fact, many universities, transmission and vehicle companies at home and abroad are working hard to develop multi-speed transmissions, and some companies have even reached or are close to mass production.
The 8th International Automotive Transmission and Drive Technology Symposium TMC2016 jointly organized by the Chinese Society of Automotive Engineers and China Automotive Hansi Management Consulting Co., Ltd. will be held on April 28-29 at the Renaissance Beijing R & F Hotel. The seminar will provide 45 reports to introduce and discuss traditional power vehicle transmission enhancement technology, (plug-in) hybrid and electric vehicle transmission and drive technology.
The topic of electric vehicles at this conference has also received positive responses from companies. BorgWarner, Protean, Ricardo, Zhongke Shenjiang, HOERBIGER, hofer, SMT and other companies will introduce electric vehicle transmissions at this conference. And related products and development technologies, including multi-speed transmissions, in-wheel motors, gear shifting devices suitable for electric vehicles, power electronics, transmission simulation optimization technology, etc.
After this keynote speech, the conference will organize an interactive talk show, inviting experts from Shanghai Jieneng, Zhongke Shenjiang, Protean, BorgWarner, and Ricardo to engage in interactive discussions with representatives of the above-mentioned industry concerns. The specific questions are as follows:
What is the role of multi-speed transmission?
How will the multi-speed transmission in the European and American markets develop in the future?
Does or under what circumstances need a multi-speed transmission in the Chinese market?
What are the technical solutions for multi-speed transmissions, and what is the future development trend?
What are the main technical difficulties of multi-speed transmissions and how to solve them?
The following is a brief introduction to part of the electric vehicle transmission technical report for everyone to see.
Ricardo: Low-cost transmission concept for new energy vehicles
The development of many hybrid vehicles is often limited to modifying existing complex and expensive automatic transmissions, such as A/T or DCT. Focusing on low cost and maintaining the functionality and comfort of the hybrid system, Ricardo has developed a series of hybrid concepts based on manual transmission manufacturing and AMT drive technology. As a result, a modular, low-cost transmission has been developed, which can be widely used in EV, HEV and PHEV vehicles. In this speech, Ricardo will introduce these concepts and analyze the advantages that this method brings to new energy vehicle transmissions.
Zhongke Shenjiang: market demand and technology for 2-3 gear transmissions for pure electric vehicles
Due to the characteristics of the motor, the traditional pure electric vehicle adopts a fixed speed ratio reducer to meet the general performance requirements. However, in addition to the inability of the fixed speed ratio to give full play to the efficiency of the motor, there are also many problems in the driving motor, such as heat generation, noise, bearing life, high gear processing accuracy, and high cost. With the rapid development of the electric vehicle industry, consumers have higher and higher performance requirements for electric vehicles, and traditional fixed-speed ratio reducers cannot meet the development trend. This report will introduce the development and production of Zhongke Shenjiang's 2-3 gear transmission.
Protean: Understanding the challenges of integrated in-wheel motors for passenger cars
In-wheel motor is one of the development trends of pure electric vehicle drive system and has many advantages. This article will share the challenges and development experience encountered by Protean in the integration of in-wheel motor systems, such as vehicle control and dynamics, suspension and braking design and installation and other problems and solutions, and will introduce how in-wheel motors are required to enter the market in batches. Preparation.
SMT: Innovation and optimization of traditional electric drive systems: continuously increasing motor speed, technical challenges and efficient virtual design solutions
This report will discuss the mainstream technology trends of the continuous increase in motor speed and the continuous improvement of transmission efficiency and NVH performance requirements, introduce the main technical challenges faced in the design of drive systems to meet these often conflicting technical requirements, and show the virtual reality of traditional drive systems. Design and modeling methods, and illustrate the key performance parameters (durability, transmission efficiency, weight, noise and vibration) through case analysis and the method of simulating and analyzing these parameters.
HOERBIGER: Gear shifting device for electric vehicles
The available shifting devices (multi-disc clutch, synchronizer and claw clutch) on the traditional gearbox often cannot fully meet the special application requirements of electric vehicle powertrain. HOERBIGER has further developed a traditional synchronizer suitable for electric drive to achieve a shorter installation length, a shorter shift stroke, and minimization of drag torque and NVH.
Hofer powertrain: Scalable high-voltage and high-current power electronic platform (can be used for system development, vehicle driving or test benches)
The report proposed a high-voltage, high-current power electronic software and hardware development and test platform, which has high practicability, is conducive to shortening the product development and testing verification cycle, and is in line with the development trend of high-voltage power electronics.
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