At the Global New Energy Vehicle Supply Chain Innovation Conference held on September 16, Wang Binggang, leader of the National New Energy Vehicle Innovation Project Expert Group, said that the "comprehensive electric drive plan" should be used to replace the "no combustion time" "Table" is more in line with China's national conditions. Comprehensive electric drive can eliminate the boundaries between transmission vehicles and new energy vehicle technology systems, build a new overall technical structure and industrial chain layout for China's automobile industry, and help form an overall development of China's automobile industry. Ideas and layout.
Wang Binggang, leader of the expert group of the National New Energy Vehicle Innovation Project (Photo source: Global New Energy Vehicle Supply Chain Innovation Conference)
Under the comprehensive electric drive, the electric drive system will undoubtedly Becoming the top priority in the future automobile industry chain. In this regard, Wang Binggang emphasized: “We must learn from the lessons of the internal combustion engine industry, increase independent research and development and industrial development of electric drive systems, and pay attention to the research and development of key materials, core parts/components, main control chips (MCUs) and software architectures. , forming an independent and controllable industrial chain. ”
Integrated and deeply integrated electric drive systems have become a trend
As the core technology of new energy vehicles, especially electric vehicles, electric drive systems The performance, efficiency, size, weight, reliability, etc. are directly related to the performance of the vehicle and even the overall efficiency. At the 2020 International Automotive Transmission and Drive Technology Symposium, Chinese and foreign experts agreed that electric drive systems are rapidly developing in the direction of lightweight, platform-based, and intelligent, and integrated design is an effective way to cater to this development trend.
Some expert analysis pointed out that in the future, electric drive integration will be like Lego toys, which will standardize the design and production of automobile parts to achieve modularization. This kind of module can be installed on different models of the OEM, improving the reuse rate of parts, shortening the vehicle development and iteration cycle, helping to establish unified quality standards, and also helping to reduce development, manufacturing and procurement costs.
Based on this, the integration of electric drive systems has been the focus of development of major car companies and parts suppliers in recent years. As early as 2017, the power systems of Tesla's Model Y and Model 3 have evolved from electronic controls, motors, reducers, OBCs, DCDC, etc. in the form of individual components to the 3+3 platform. Currently, a The three-in-one module of "Electronically Controlled Motor Reducer" and the three-in-one module of "OBC DCDC PDU". Model Y and Model 3 adopt platform integrated design, with a parts reuse rate as high as 76%.
At present, the "three-in-one" technology based on the traditional mechanical level has gradually matured, while the "all-in-one" technology at the power electronic level has become a hot research area in the industry, especially power devices. In-depth integration with power devices.
In addition, in response to the lightweight design requirements of electric vehicles, the "all-in-one" integrated solution is also the most effective weight reduction solution for electric drive systems at this stage. It is understood that the "all-in-one" integration solution can not only enjoy the shell coupling and cooling system, but also the circuit and power switching devices, reducing the volume and weight of the electric drive system by about 30%, and the power density reaches 1.9kw/ kg.
At the same time, the smaller drive system can be easily deployed horizontally on more models, and can also maximize the seating space for end users. This highly integrated design also provides Cars have laid the foundation for becoming a mobile "third space" besides homes and offices.
The industry's first hyper-converged power domain solution will be launched
It should be pointed out that the electric drive system not only replaces the engine of traditional fuel vehicles as the embodiment of power, but also serves as the driving force for electric vehicles. The cornerstone of intelligence. Especially with the development of intelligent connected electric vehicles, the intelligence and OTA of power systems have become new areas of competition in the industry.
It is reported that after Tesla completed the intelligentization and OTA of assisted driving and cockpit, it began to intelligentize and OTA the power system.
Currently, Model 3 has launched a software upgrade package priced at RMB 14,100 that can increase the acceleration from 100 kilometers per hour from 4.6 seconds to 4.1 seconds. This means that Tesla has established a new moat in the power system.
From the perspective of the industry, the key to leading the development of the next generation power system modular platform is not only a physically integrated modular platform, but also a modular platform with deep functional integration. Only in this way can the power system be fully integrated. Intelligence and OTA lay the hardware foundation. Therefore, the next-generation power system modular platform should be a modular platform that deeply integrates hardware, software, and cloud.
From a specific implementation level, the hardware part should first undergo in-depth system integration to minimize the application of wiring harnesses, pipelines, brackets, and fasteners, and achieve optimal volume and cost of the power system; On this basis, the software carries out centralized control and functional integration. Through standard software architecture, software and hardware decoupling and software hierarchical decoupling are implemented to achieve software forward compatibility with hardware and software minimum upgrade packages, truly achieving fast and dynamic , secure OTA; finally, through hardware sensor pre-embedding, preliminary screening of vehicle-side data, and synchronization with the cloud, vehicle-cloud data collaboration is achieved.
A senior leader of Huawei once pointed out: "Future intelligent connected cars need 360-degree perception, transmit a large amount of information, and make inferences and decisions based on the collected information. We recommend that communication and computing Combined, the car is made into a distributed Ethernet three domain controller architecture (CCA) to realize software-defined cars and continue to improve the experience for consumers. ”
As a veteran player in the power electronics industry, Under the main tone of software-defined cars, Huawei is once again at the forefront in the field of deep integration of electric drive systems. It is reported that at the upcoming 2020 Beijing Auto Show, Huawei will launch the industry's first highly integrated all-in-one electric drive system. This system has the characteristics of high integration, high reliability, and modularity, and can help speed up vehicle development by 2 Monthly, cost reduction by tens of millions.
Judging from the countdown poster recently exposed, the hyper-converged power domain solution launched by Huawei this time includes seven major components: BCU, PDU, DCDC, MCU, OBC, motor, and reducer, realizing the traditional machinery From "three-in-one" at the power electronics level to "all-in-one" at the power electronics level, it is deeply integrated. More information about the hyper-converged power domain solution will be further announced by Huawei on September 25, and Gasgoo will also continue to pay attention.
This article comes from the author of Autohome Chejiahao and does not represent the views and positions of Autohome.