On November 14, Lei Jun officially released the pre-research technology of Xiaomi automobile intelligent chassis.
The four core technologies of Xiaomi full active suspension, Xiaomi super four motor system, Xiaomi 48V line control and Xiaomi 48V line steering are demonstrated.
In just one year, Xiaomi released three generations of chassis technology, which really achieved mass production, release and pre-research generation.
Xiaomi intelligent chassis pre-research technology, Xiaomi SU7 intelligent chassis helps to create “the best car to drive within 500000”.
SU7 Ultra intelligent chassis was born in New Zealand and achieved peak performance.
While the intelligent chassis pre-research technology greatly improves the ride comfort and driving control limit, it is more oriented to the future, showing Xiaomi car’s thinking about the future intelligent chassis: helping to achieve fully self-driving, getting through the deep integration of “human-car home ecology”, and creating a comprehensive digital base.
Xiaomi full active suspension, “zero bumps, zero roll, zero pitch”, active suspension can be called the pinnacle of suspension technology, is the configuration of millions of luxury cars.
Each wheel end of Xiaomi full active suspension is equipped with power up to 4.
6kW power source and double valve CDC, which is the core difference between full active suspension and ordinary air spring + CDC semi-active suspension.
Xiaomi full active suspension is different from the “forced labor” of semi-active suspension changed by road surface stimulation, Xiaomi full active suspension turns passively into active, does not depend on vehicle movement and road conditions, and relies on the power source to control the resistance of each wheel separately.
to achieve accurate control of the body posture, so that daily ride is more comfortable, limit driving control is more robust.
The power source filters the road surface impact by quickly adjusting the size and direction of the force.
Compared with semi-active suspension to restrain roll, bump and pitch, full-active suspension can achieve “zero turbulence, zero roll, zero pitch”, and even achieve “reverse roll” similar to motorcycle bending.
Xiaomi full active suspension can also take power directly from the EHV system, and the system lift of 44400N can even lift two SU7 Max, which is the basis of “continuous take-off in place”.
Of course, this function is not for show, the strong lifting force enables the vehicle to easily resolve the strong impact of the ground.
Xiaomi full active suspension is also connected to “Human-car Family Ecology” to achieve mobile phone-controlled suspension.
Lei Jun also demonstrated Xiaomi 15 control suspension dance in the video.
Want to dance smoothly, requires the suspension to have a very high adjustment range and speed, millet full active suspension 140mm height adjustment range, can let the vehicle through a large ridge, but also can achieve the suspension welcome function, full of ritual.
100 times the adjusting speed of the air spring, it can accurately filter out very fine road bumps.
In the era of intelligent driving, fully active suspension can also be combined with road preview, cloud data, etc.
, to achieve prediction and adjust the suspension in advance, bringing the comfortable experience of “magic carpet suspension”.
It can also cooperate with other executive agencies to achieve a smooth and safe intelligent driving experience.
At the same time, it is also ready for fully autopilot in the future.
Xiaomi Super four Motor system, 2054PS large horsepower, small size, accurate control, multi-dimensional challenge to the technical limits of electric drive, Xiaomi Super four Motor system, 2 new pre-developed motors + 2 V8s rear motors, constitute a new Xiaomi Super four Motor system.
The maximum horsepower has reached an amazing 2054PS, with no more than five cars surpassing 2000PS in the world, all of which are super cars in the tens of millions of classes.
Xiaomi newly developed pre-dual electric drive system, Xiaomi newly developed front motor single motor maximum horsepower 449PS, peak torque 380N ·m, maximum speed 28000rpm.
High horsepower and high speed once again verify Xiaomi’s unremitting pursuit of peak performance.
With the X-Pin winding stator, the engineers of Xiaomi Automobile have overcome the huge challenge of increasing power in limited space.
The newly developed front motor has achieved extreme results in reducing volume and weight.
In the aspect of stator winding, X-Pin winding is innovated.
Compared with the current mainstream H-Pin winding, X-Pin winding is optimized at the welding end, eliminating the straight line segment, reducing the end height of the winding and reducing the overall size of the motor.
Planetary reducer, millet front double motor explosion diagram, in addition, we also innovated the design of planetary reducer, so that a single reducer weight reduction 7kg, size reduction 50mm.
At the same time, the front dual motor system adopts coaxial arrangement, and the system size is further reduced compared with the parallel axis arrangement.
Originally, only one motor can be arranged on the front axle, but now two can be arranged to further improve the power performance of the whole vehicle.
Based on the design concept of high horsepower and small volume, the power density of the newly developed front motor is also increased by 75%, up to 11.
89kW/kg.
Reducing the volume of the electric drive can also effectively increase the riding space.
Of course, the four-motor is not only a simple increase in number and horsepower, the key is to achieve a four-wheel independent drive, giving driving more possibilities and bringing unparalleled driving fun.
The four motors of Xiaomi Super four Motor system can achieve 500 torque control per second, which is safer, more stable, easier to control, and always maintains a good body posture, so that ordinary people have the ability to control the car like a race car driver.
Lei Jun shows scenes such as in-situ U-turn and compass U-turn, which are typical applications of four-motor independent drives.
By controlling the tires on the left and right sides to rotate in the opposite direction, the in-situ turn around the center of the vehicle can be realized.
a single wheel can be locked by braking, and the compass can be turned around the wheel.
Xiaomi super four-motor system not only realizes these functions, but also makes further exploration.
The speed of the U-turn in place can be controlled, as fast as you want, and slow as you want, showing a very high ability of control.
In addition, the Xiaomi super four-motor system can make a continuous U-turn for many times, which puts forward high requirements for the cooling system of the motor.
The stator of the super four-motor system adopts double-cycle three-dimensional oil cooling technology, compared with the one-way oil circuit design commonly used in the industry, the effective heat dissipation area is increased by 100%.
the rotor adopts S-type oil circuit design, realizing the synchronous cooling of the rotating shaft and the iron core.
This set of heat dissipation system is installed on the rear drive system of SU7 Ultra, which brings the astonishing result that the maximum cooling of the Niubei test motor is more than 30 degrees Celsius.
In-situ U-turn and compass U-turn are also very practical in daily use, making it easier to operate and drive in narrow spaces or complex road conditions, especially in emergencies, you can quickly adjust the direction of the vehicle and improve driving safety.
For novice drivers, these functions can also reduce driving pressure, make it easier for them to control the vehicle, and improve driving self-confidence.
The world’s first 48V trunk line controlBraking, faster response, overall improvement of safety performance, Xiaomi intelligent chassis pre-research technology to achieve 48V chassis system line control.
The voltage of the low-voltage system was upgraded from 12V to 48V, and the low-voltage loss was reduced by 75%.
High voltage brings more bandwidth to meet the growing demand for high-power devices of intelligent vehicles.
In addition to the benefits of the chassis system, users can also enjoy more efficient refrigerators, more powerful chips, more screens, and so on, further opening up the “full ecological” integration of people and cars.
In addition, with the increase of voltage, the weight of the wire harness is also reduced to further meet the demand of lightweight.
At present, only pure electric models such as Tesla Cybertruck have realized 48V low-voltage system, and Xiaomi’s technology reserve is in the leading position in the industry.
The wire-controlled chassis is the basis for the integration of intelligence and motorization.
after canceling the mechanical connection and using electrical signal transmission, the man-machine can be decoupled, and the vehicle can carry out driving tasks automatically without relying on the operation of the driver.
After the mechanical structure is cancelled, the mechanical transmission loss is reduced and the vehicle weight can be reduced at the same time.
It has laid a solid foundation for the realization of high-level self-driving.
Based on 48V line control, Xiaomi has achieved two technological breakthroughs.
The first is Xiaomi’s world’s first 48V full-dry line-controlled brake.
The so-called “all-dry” refers to no hydraulic oil, the use of electric calipers, through the motor to push the piston to clamp the brake disc to achieve wire-controlled telex.
Optimize the layout of the whole vehicle to make maintenance easier.
Xiaomi 48V line controls the movement, and the on-line braking system increases the response speed by 40%, braking faster, and the drag torque is reduced by 50%, which increases the mileage by more than 10km.
The foot feeling of the pedal is three-level adjustable, and you can customize different driving styles such as comfort, standard, sports and so on.
Safety performance has been improved in an all-round way, designed in accordance with the industry’s highest functional safety level standard (ASIL-D).
Double-piston electronic brake caliper, Xiaomi pioneered double-piston electronic brake caliper, which adopts imitation clamp design, beautiful color and quite a sense of movement.
Functionally, its friction area is more than 50% larger than that of a single piston of the same design.
In the face of fierce driving conditions such as the track, it can further reduce the temperature rise of the brake disc and can rest assured to gallop on the track.
For the first time in China, 48V steering by wire is realized, the cockpit layout without steering wheel is realized, fully autopilot is supported natively, Xiaomi 48V steering by wire, 48V steering by wire technology realizes the decoupling of steering wheel and wheel, there is no mechanical connection between steering wheel and wheel, using “line” connection, the relationship between steering wheel angle and wheel angle can be adjusted by software, and the steering ratio range is up to 515 / 15.
It takes into account the flexibility of low-speed turning and the stability of high-speed lane change.
In a particular scene, it is even possible to kill the steering wheel without turning the wheel.
At the same time, in terms of security, it is designed in accordance with the industry’s highest functional safety level standard (ASIL-D).
Under this premise, the steering wheel, which we are familiar with, will have more possibilities and new breakthroughs.
If you want to enjoy driving, you can install the steering wheel.
if you want to play games in the car, you can change to a variety of special-shaped steering wheels.
if you want to be fully autopilot, you can just put away or remove the steering wheel.
Based on the on-line chassis, a “software-defined car” can also be realized, and the same car can have different brake feet, different steering styles, different road sense feedback, different suspension soft and hard.
“driving a BMW, taking a Mercedes-Benz” can be achieved in one car.
AI continues to empower, intelligent chassis will eventually become a comprehensive digital base, smart driving is not only the competition of sensors, chips, large models, the performance of the executive layer determines the user experience, Xiaomi car from the very beginning, for the original support for fully self-driving, but also more fun smart chassis ready for continuous investment.
Most importantly, the unique AI capability of Xiaomi Group will continue to enable the chassis to fully break through the “full ecology of people and cars”, and the smart chassis will become a comprehensive digital base, facing more forward-looking technological development in the future, bringing unprecedented experience changes.
Ten times the investment, adhere to the self-research of the underlying core technology, the chassis, as one of the three major parts of the traditional car, is the foundation of a good car.
in the intelligent era, the intelligent chassis, together with intelligent driving and intelligent cockpit, has become the “new three pieces” of intelligent cars.
At present, the software and hardware of Xiaomi intelligent chassis have applied for 56 patents, 37 of which are invention patents.
The development of smart chassis has just begun, and the technology released this time is only a small part, far from the end we believe.
In the future, Xiaomi will continue to invest ten times in smart chassis, intelligent cockpit, intelligent driving, electronic and electrical architecture, and stand on top of the world with the top products and technology.
The next generation of smart cars is within reach.
Please look forward to it.
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