How many times has your family hit your sunroof because of a speed bump mind? Are you a tuning enthusiast?
If you just go with CDC shocks that’s too bad, because it won’t achieve the handling you want!
Air suspension is too noisy, requires repeated trips to the garage when pre-fitted, wastes most of your time and doesn’t work as well as it should …… If you are thinking the same thing, then please be patient and read this introduction to improve the Tesla’s overly stiff chassis 100%! Get started now.
Tesla Absorbers – Magnet Suspension System for Tesla Model 3 and Tesla Model Y
On the Same Level as the Supercars, Tesla Absorbers – is the Magnetic Suspension System for the Tesla Model 3 and Model Y is a specially designed suspension system that consumes only 20 watts of electricity, is non-destructive to install (4 hours), and improves handling and comfort! This suspension system is a 100% solution to Tesla’s stiff chassis problem ?But……….. why is it so amazing?
Firstly, we need to understand how this pause works, after all, Guys reading this article are also very attentive consumers!
Tesla Absorbers – Magnetic Suspension System for Tesla Model 3 and Model Y Description of Control Functions
| No. | module | Function Description |
| 1 | Adaptive control function | According to the current speed, steering wheel angle, body acceleration in all directions, spring sag acceleration and other information to determine the road conditions and vehicle status, automatically calculate the damping force of the suspension, according to the damper model to automatically control the PWM, so as to control the damper current, to achieve the expected damping control objectives, to achieve the best comfort and handling |
| 2 | sports mode | Increased damper damping force for aggressive handling demands |
| 3 | Comfort Mode | Soft damper characteristics for comfort |
| 4 | Driving Mode Selection System | Ability to adjust damper characteristics in response to different driving modes |
| 5 | Bump&hole function | Optimum comfort when crossing speed bumps/bumpers/well covers |
| 6 | Anti-roll control function | Change the damping force of the left and right dampers to reduce the transient vehicle roll angle. |
| 7 | Anti-nodding control function | By the brake pedal, longitudinal acceleration change amount and other signals, through the enhancement of the damping force of the damper to control the vehicle nodding, so that the body front pitch small |
| 8 | Anti-tilt control function | The damping force of the damper is increased appropriately for a short period of time by signals from the brake pedal, longitudinal acceleration change amount, etc. to reduce the rearward movement during start-up and rapid acceleration. |
| 9 | Vehicle start/stop control | Provide corresponding damping mode and control current according to vehicle start/stop control |
| 10 | Closed loop monitoring of output current | Identifies whether the output current is at the desired value and adjusts if there is a deviation |
Tesla Absorbers – Magnetic Suspension System for Tesla Model 3 and Model Y consists of a sensing system, an intelligent control system, a smart material (i.e., magnetorheological fluid) and a magnetorheological damper. The sensing system completes the information acquisition and uploading of vehicle state, the intelligent control system completes the decision-making calculation and the application of target current, and the magnetorheological damper outputs the required target damping force, thus controlling the vehicle attitude.
MRD = Schematic structure of an magnetic shock absorber
Features of the Tesla MRC suspension MRD product:
- Fast response: the frequency of change of damping force can be more than 1000 times per second;
- High durability: the change of mechanical properties after long-term work is very small, and its effect is negligible when measured from the perspective of vehicle dynamics;
- High adjustability: the adjustable range of the damping force is large, and the force coverage is much larger than that of ordinary dampers by 100%.
- low temperature sensitivity: at different temperatures, the rate of change of the damping force is much smaller than that of an ordinary damper.
Magnetorheological fluid (MRF)
Typical properties of Tesla MRC suspension magnetorheological fluids
| Appearance | Dark grey liquid |
| Zero-field viscosity (mPa.s, 40°C) | 75±15 （800～1200 s-1slope） |
| Density, g/cm 3 (room temperature) | 2.60～2.75 |
| Solid content (wt%), % | 78.26 |
| Operating temperature (°C) | -45～130 |
| Flash point (°C) | >150 |
Tesla MRC suspension Magnetorheological Fluid Product Features
- Low zero-field viscosity
The very low viscosity under zero magnetic field conditions facilitates the actuator to obtain the lowest possible lower limit of the adjusting force value.
- High yield strength
The high yield strength in the presence of an applied magnetic field facilitates the actuator to obtain the highest possible upper limit of the regulated force value.
- Good wide temperature range
It can be used normally for a long time in the range of -45℃-130℃.
- Good resistance to sedimentation
Low settling rate after prolonged standing and no hard settling.
- Good re-dispersibility
Very easy to re-dispersed and homogeneous after prolonged standing and settling.
- Good resistance to thickening
No IUT (using thickening) occurs after a long time of use.
- Good aging resistance
Long-term use is not easy due to oxidation, temperature, light, mechanical force and other factors occurring aging phenomenon.
- good mobility
Excellent flowability after withdrawal of the applied magnetic field.
- Good sealing compatibility
The use of special materials and formulations, good compatibility with sealing materials, which is conducive to ensuring the reliability of the seal.
- Good friction reduction
The low coefficient of friction with the contact surface contributes to the mechanical properties of the actuator.
- Good resistance to abrasion
Long-term use has a low wear effect on the contact surfaces, which contributes to the durability of the actuator.
- Greener environment
Prepared with environmentally friendly materials and processes, it is friendly to the environment.
Photographs of the ECU
ECU technical characteristics:
- System features
The system adopts a modelling and modular platform control strategy to develop the functional software of the electronically controlled suspension system, which can help customers realize various functions such as whole-vehicle motion attitude calculation, vertical vibration control, body height control and whole-vehicle communication, and can provide matching calibration services.
- Functional Safety
It supports ISO26262 ASIL B safety level and meets the application requirements of magnetorheological system.
- Hardware and software features
Software development follows the requirements of ASPICE process system and ISO26262 development process, which can achieve comprehensive management and traceability of requirements, design, model, code and test.
The controller hardware adopts the development scheme with high integration, good adaptability and easy to expand functions. It adopts a new generation of 32-bit high-performance processor, and the hardware design is compatible with a higher sequence of main chips to support the needs of arithmetic power and memory resource expansion. Powerful power management chip can provide an important guarantee for the safe operation of the whole system, and at the same time, it has the function of periodically waking up the system. The controller integrates a six-axis inertial sensor chip, reserving a variety of types of sensor signal acquisition input channels. The output has 4-8 output channels.
- Mechanical structure
Mechanical structure design adopts separate mounting scheme, taking into account the hardware PCB layout and heat dissipation requirements, the overall size is compact, occupies less space, and can be conveniently and flexibly arranged in the passenger compartment or aft cabin. It can meet the operating temperature of -40℃ ~ 85℃ and IP6K9K dustproof and waterproof performance level.
Control Algorithm
Canopy control strategy (SH) and acceleration-driven damping control strategy (ADD) = SH-ADD two classic semi-active control strategies can be complementary in terms of control effect. The canopy control strategy has a better control effect in the low frequency band (around the body resonance frequency), while the acceleration-driven damping control has a better control effect in the middle and high frequency bands (above the body resonance frequency).
The optimised hybrid canopy-acceleration-driven damping control algorithm (SH-ADD) uses a simple frequency band selector to identify the transient characteristics of the suspension; the canopy control strategy is selected in the case of low-frequency vibration, and the acceleration-driven damping control strategy is selected for the other frequency ranges.
In the figure below, the SH-ADD algorithm is used to compare with other control strategies that target ride comfort. It can be concluded that the control effect of this algorithm is almost optimal, and it can almost perfectly combine the advantages of canopy control and acceleration-driven damping control. As a result, its control is very close to the lower limit of the frequency response curve. In fact, it is difficult to find other control algorithms with better control results for body acceleration.
Comparison of standardised performance indicators: ride comfort – (left histogram) and road holding – (right histogram).
Ride comfort oriented control algorithms and SH-ADD algorithms with standardised performance metrics trade-offs against passive suspension system, ride comfort and road adhesion limit values (dashed lines) for damping values (solid lines with colour changes).
Tesla MRC Suspension: the heart of control of the automotive chassis ride experience
1) According to the basic principles of automotive dynamics, the decisive factor for the overall attitude of the car is the damping and stiffness of the suspension;
2) Tesla MRC Suspension can independently regulate suspension damping and stiffness, but also coordinate other components (ESC, steering, ABS, etc.) to regulate other forces on the wheels;
3) Tesla MRC Suspension can regulate the motion attitude of the car to ensure vehicle driving experience and driving safety, the key to chassis line control.
The magnetorheological fluid (MRF) is filled in the specially designed magnetorheological damper (MRD). When the road surface is uneven and causes wheel hopping, the vibration response information of the car is transmitted to the control system through the sensors, and the controller calculates and decides according to the pre-set control algorithm (optimised SH-ADD algorithm), and sends out the corresponding commands, adjusting the current of the electromagnetic coils in the damping channel in real time, and then changing the magnetic field strength.
The magnetic field strength in the damping channel is adjusted in real time to produce different yield stresses and apparent viscosity coefficients, thus adjusting the output damping force of the magnetorheological damper and achieving continuous and controllable adjustment of the damping force to achieve the purpose of intelligent vibration damping of automobile suspensions, thus maintaining the handling and comfort of the car in a perfect state.
Tesla MRC Suspension Pros
In the vehicle dynamics analysis, the steering response of the vehicle with the magnetorheological suspension is more rapid and higher speeds can be achieved. In the steering wheel angle step test, the trajectory of the vehicle with the magnetorheological suspension was shorter, indicating better handling. In the cornering performance test, the magnetorheological suspension adjusts the suspension damping value thousands of times per second, which enhances the support of the vehicle’s suspension during cornering, strengthens the tyre’s lateral grip and reduces the body roll.
In acceleration tests on bumpy roads, the magnetorheological suspension limits body bounce and keeps the tyres in contact with the ground at all times, resulting in shorter acceleration times to 100km. The performance of the magnetorheological suspension is excellent, while comfort is improved compared to conventional suspension. In terms of filtering out low-frequency body vibrations and high-frequency road noise, the magnetorheological suspension has a clear advantage over conventional suspensions.
Compared with CDC electro-hydraulic adjustable suspension, magnetorheological damper (MRD) has fewer parts and a simpler structure, and the biggest feature of MRD is its rapid response, adjusting suspension damping up to 1,000 times per second, which is much faster than that of CDC.
Magnetorheological intelligent suspension in the European and American automotive markets, magnetorheological suspension products have been commercially available on a large scale for more than 20 years, and are widely equipped with supercars, luxury cars and C-class sedans,Cadillac. According to Transparency Market Research’s forecast in 2019, in the next 15-20 years, nearly half of the world’s automotive vibration dampers will use magnetorheological technology. The application of magnetorheological materials in dampers greatly promotes the process of suspension intelligence.
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