The starting point of the relaxed quartet
The pursuit of four-wheel independent drive technology and ultimate safety 20 years ago
As early as 2004, BYD released the ET pure electric concept car at the Beijing Auto Show, which is equipped with a four-wheel motor and can independently control the torque of four wheels.
At that time, the new energy automobile industry had just started, and the industrial support was immature. The mass production of four-motor technology requires high-performance batteries, high-power integrated motors, efficient electronic control and accurate software control capabilities, but the research in these fields was still blank at that time.
At the same time, in the aspect of fuel vehicles, because the traditional body stability control technology to control the active safety of vehicles has bottlenecks in perception speed and accuracy, there are also problems in implementation, such as slow response, low efficiency, low power and low degree of four-wheel differentiation, and there are a large number of accidents caused by instability and out of control every year.
It can be said that controlling the body posture through four-wheel drive independent drive technology is BYD's initial intention to pursue ultimate safety.
The ET concept car carries BYD's bold vision of the ultimate safety of the car: let the car have four independent and powerful legs like a cheetah.
02
Yi Sifang's confidence
More than 10 years of experience in mass production of wheel-side motors and world-leading technology patents.
BYD has more than 65,438+00 years of experience in motor design, manufacturing and mass production control: from 2065,438+03, BYD took the lead in applying hub motor technology to K9 pure electric buses and exported them to Britain.
BYD has accumulated more than 65,438+00 years of motor technology in research and development. The key core technology can't be bought, and we can only rely on independent research and development to continuously cultivate a "technical fish pond". Yi Sifang is a master of technical fish ponds.
03
The birth of Yi Sifang
100% self-developed third power and system platform
Why didn't we release the platform of looking up to the brand and easy Sifang technology after the comprehensive development of wheel motor technology for many years? This is because high-end models have the ultimate pursuit of power, space occupation, torque, perception and control: high-performance batteries, high-power integrated motors, efficient electronic control and software control capabilities are indispensable.
Easy Sifang technology platform: each system has achieved 100% independent research and development, including: front dual motor assembly, rear dual motor assembly, central controller, blade battery and other core components; At the same time, it also covers the corresponding control systems such as vehicles, engines, motors and batteries. The comprehensive independent research and development capability endows Yi Sifang with strong product strength.
Easy Sifang is suitable for pure electric and hybrid platforms, and can fully cover many high-end models such as hard-core off-road and super-running to meet the diverse needs of users.
Hardware part: Easy Sifang is the ultimate safety technology platform that truly realizes independent driving of four motors, deep fusion perception of vehicles and vector control of body stability. Four motors constitute the core power source of the vehicle, and each motor can control each wheel independently, so as to realize the driving, braking, forward and backward of a single wheel, which makes the vehicle have super body attitude adjustment ability.
Easy square electric drive assembly system
The technical indicators are leading the industry in an all-round way: the deep integration design of motor and electric cabinet is adopted for the first time, the structure is more compact and the space utilization rate is greatly improved. The motor power covers 220kW~240kW, the torque is 320Nm~420Nm, the efficiency is as high as 97.7%, the maximum speed is 20500rpm, and the horsepower of the whole vehicle exceeds 1000 horsepower. The technical indicators are fully ahead of the industry.
Both front and rear are equipped with differential locks to further strengthen the ability of off-road extrication: off-road vehicles equipped with easy platform can accelerate for three seconds in 100 kilometers, and the super power performance reaches the super-running level. At the same time, the front and rear electric drive assemblies are equipped with differential locks, which further strengthens the off-road ability.
Simple square electric control
All models of E-Sifang platform are equipped with a new generation of silicon carbide SiC as standard, and the highest efficiency can reach 99.5%. With higher computing power and control speed, the current output capacity is increased by 50%, the power density is increased by 100%, and the working efficiency of the whole vehicle is increased by more than 3%.
If electrification is the first half,
Then the interactive integration of electrification and intelligence is the second half.
Yi Sifang is an all-round subversion.
Innovative technology of traditional automobile drive system capability.
Software part: The electronic and electrical architecture combining the central computing platform and the distributed controller is adopted, and four motors are endowed with "super brains" through the closed loop of vehicle-level integrated sensing, decision-making, control and cloud data to realize the ultimate safety of vehicles.
Yi Sifang put forward the concept of fusion perception for the first time in the industry, which truly achieved the deep integration of electrification and intelligence.
How to perceive
It integrates various sensors of the whole vehicle, including traditional real-time data, such as inertial navigation, motor wheel speed, steering, tire pressure and so on. And intelligent driving sensing data such as camera, laser radar, millimeter wave radar and high-precision positioning, so that vehicles can receive all kinds of signals most quickly and accurately, and provide more powerful data support for four-motor identification, decision-making and control. In addition, Yi Fangfang also gives full play to the sensing ability of the wheel motor, which is much higher than the sensing efficiency and accuracy of the traditional fuel vehicle, and senses the four-wheel motion state of the vehicle in real time, providing rich sensing data support for the dynamic control of vehicle driving.
How to control
In the face of the massive data obtained after fusion perception, Yisi Road technology platform needs an efficient and fast control architecture to analyze the data quickly, so it adopts a highly collaborative control architecture of central computing platform and domain control architecture. The central controller adopts a chip with large computing power, and realizes the real-time communication of sensor information and control strategy with the controllers in each domain through the vehicle-mounted network with high bandwidth, low delay and high security. Thanks to this, the easy Sifang technology platform can effectively synchronize and fuse multi-modal sensing signals from controllers in various domains, and realize accurate and diversified control of four motors through the highly cooperative work of controllers and sensors.
How to implement it
According to the system perception and data deconstruction control of the above-mentioned high-power platform, the four motors have obtained strong information support, and can vector control the driving force of each wheel in magnitude and direction, and independently adjust different speed and torque combinations to realize the driving, braking, forward and backward of each wheel, which not only has stronger power, but also realizes the complete decoupling of the torque magnitude and direction of the four wheels, and the torque of the four wheels can be large or small, and can be positive or negative.
so far
Flexible limbs.
And the super-brain easy-to-square technology platform.
Looking up at U8 can be a piece of cake.
This article comes from the car stereo of the author of Easy Car Number, and the copyright belongs to the author. Please contact the author for any form of reprint. The content only represents the author's point of view and has nothing to do with the car reform.