Solutions
Since its founding, Huahai Technology has upheld the spirit of excellence and innovation, earning unanimous praise from customers through high-quality controller products, continuously improving development tools and comprehensive technical services.
Chassis By-wire Control
Introduction
Based on Huahai Technology's RapidECU all-domain electronic control development platform, this solution addresses industry pain points of traditional mechanical chassis — bulky structure, low control precision, lagging response, poor intelligent expandability, inability to adapt to high-level autonomous driving, and weak multi-actuator coordination consistency — delivering a professional overall chassis x-by-wire solution. Centered on the three core systems of brake-by-wire, steer-by-wire and suspension-by-wire, it eliminates traditional mechanical hard connections and adopts precise all-domain electrical signal control, achieving electronic, refined and redundant management of chassis actuators. It is the core foundational architecture for high-level intelligent driving, all-domain body attitude control and vehicle dynamic performance upgrades. Backed by a full proprietary toolchain — ECUCoder automatic code generation, MeCa chassis-specific calibration, SimCar x-by-wire-chassis-dedicated HIL simulation and the SimCore vehicle dynamics virtual proving ground — it is fully compatible with MATLAB/Simulink model-based development, supports the AUTOSAR architecture, SOA service-oriented adaptation and the ISO 26262 ASIL-D functional safety system, and adapts to all categories of battery-electric, hybrid and range-extender vehicles. It covers the full lifecycle of prototype algorithm validation, chassis bench commissioning, vehicle dynamics calibration and mass production, comprehensively improving vehicle handling, comfort, driving stability and intelligent-driving execution precision.
Scheme architecture diagram

Four-layer full-stack chassis x-by-wire system architecture

Plain Text
┌────────────────────────────────────────────────────────────────────────┐
│ Top Development Tool Layer (Full-chain Closed Loop)

│ ECUCoder auto code generation   │

| MeCa X-chassis calibration      │

| SimCar X-by-wire HIL             │

| SimCore vehicle dynamics simulation │

| Bus recorder │
├─────────────────────────────────────────────────────────┤
│ Middleware Software Layer (Chassis X-by-wire Core)   │
│ Brake-by-wire calculation logic   │

| Steer-by-wire following control   │

| Active suspension adjustment strategy   │

| Vehicle posture closed-loop control   │

| Multi-actuator coordinated scheduling   │

| X-by-wire redundancy safety mechanism   │

| Road-condition adaptation   │

| Chassis fault diagnostics   │

| Dynamic fault-tolerant degradation |├─────────────────────────────────────────────────────────┤
│ Hardware Layer (Dedicated X-by-wire Chassis Controller Platform)│
│ S5 high-end chassis domain controller    │

| S3 motion X-by-wire fusion controller    │

| High-precision signal acquisition    │

| High-speed PWM actuator drive    │

| Multi-channel CAN FD/Ethernet    │

| Dual-redundancy hardware design    │

| Automotive-grade wide-temperature anti-interference architecture│
├─────────────────────────────────────────────────────────┤
│ Vehicle Application Layer (Full-domain X-by-wire Control)  │
│ Brake-by-wire precise deceleration    │

| Steer-by-wire angle tracking    │

| Suspension posture adaptation    │

| Chassis execution for intelligent driving    │

| Stability control under extreme conditions    │

| Vehicle dynamic performance optimization  |└──────────────────────────────────────────────────────────────────────┘

System interconnection logic

Chassis attitude sensors, wheel-speed sensors, steering-angle sensors and braking / suspension actuators → chassis x-by-wire unit (dynamics calculation, precise command allocation, multi-mechanism coordination) → cross-domain coordinated execution by the vehicle central domain, motion domain and intelligent driving domain. The upper-computer toolchain completes the full closed loop of x-by-wire strategy modeling, automatic code generation, chassis dynamics HIL closed-loop simulation, real-vehicle performance calibration, production flashing and fault diagnostics.

Functional Features

1. Three-in-one all-domain x-by-wire coordinated control. 

Integrating brake-by-wire, steer-by-wire and active suspension-by-wire into unified management, it breaks down the silos between traditional chassis systems and realizes real-time coordinated braking, steering and attitude adjustment, solving the fragmented handling, unsynchronized response and poor extreme-condition stability of traditional chassis, and building an all-domain electronic intelligent chassis.

2. High-precision dynamic command response. 

Eliminating mechanical transmission play and lag errors, it adopts millisecond-level precision electrical signal transmission and closed-loop calculation; steering angle, braking force and suspension damping are steplessly and finely adjustable, with control precision far exceeding traditional mechanical chassis, perfectly matching the precise execution needs of high-level intelligent driving.

3. All-condition body attitude adaptive control. 

With built-in high-precision vehicle dynamics algorithms, it identifies cornering, slopes, high speed, low-friction roads and heavy-load bumpy conditions in real time, actively adjusting suspension stiffness, braking distribution and steering assist to suppress cornering roll, stabilize high-speed attitude and optimize bumpy-road filtering, greatly improving vehicle ride quality.

4. Multi-redundancy safety and fault tolerance. 

With dual hardware backup and software multi-redundancy design, it provides real-time fault detection, strategy degradation and redundancy takeover for sensor failures, actuator faults and bus anomalies, eliminating single-point failure risks of the x-by-wire system and fully meeting high-level autonomous driving functional safety requirements.

5. Deep intelligent-driving adaptation and closed-loop execution.

 It precisely responds to all-scenario commands from the intelligent driving domain such as ACC, AEB, LCC and automatic lane change, achieving seamless connection between intelligent-driving decisions and chassis execution, solving the lagging execution, insufficient precision and poor following of traditional chassis, and greatly improving the smoothness and safety of intelligent driving.

6. Model-based development and full-scenario simulation. 

X-by-wire chassis dynamics, coordinated control and safety redundancy strategies are quickly built on Simulink, and ECUCoder generates automotive-grade production code with one click. The dedicated x-by-wire HIL bench simulates hundreds of thousands of extreme road and fault conditions for strategy iteration and reliability validation, greatly reducing real-vehicle test risks.

Advantages of the plan

1. Comprehensive chassis performance upgrade with handling feel benchmarked against premium joint-venture brands. 

Electronic precision control thoroughly solves the play, slow response and poor smoothness of traditional mechanical chassis; vehicle steering precision, braking linearity and attitude stability are greatly improved, the handling ceiling under extreme conditions is significantly raised, and vehicle dynamic performance achieves a leap forward.

2. Self-controlled core technology breaking foreign monopolies. 

X-by-wire coordination algorithms, dynamics calculation, redundancy safety strategies and chassis calibration logic are all developed in-house; the full toolchain has no overseas licensing binding, with fully open low-level code, enabling independent iteration of core chassis algorithms and accumulation of domestic high-end x-by-wire chassis core technology IP.

3. High development efficiency and rapid model adaptation. 

With reusable same-source software and hardware and full upfront MIL/SIL/HIL verification, a large amount of chassis matching and strategy optimization is completed on virtual benches without repeated real-vehicle tuning; compared with traditional chassis development, R&D and calibration cycles are shortened by more than 50%.

4. Highly expandable architecture for intelligent driving iteration. 

The x-by-wire electronic architecture naturally adapts to high-level autonomous driving upgrades; the software-hardware decoupled design allows continuous chassis performance optimization and intelligent chassis function expansion through software iteration, adapting to L2++ to L4 intelligent driving upgrades without hardware changes.

5. Lightweight, low-energy-consumption, high-durability vehicle. 

Eliminating numerous mechanical transmission parts and hydraulic mechanisms simplifies the chassis structure, achieving vehicle lightweighting and reducing chassis mechanical losses and driving energy consumption; the electronic controllable design reduces component wear, greatly improving chassis service life and durability reliability.

6. Fully meeting automotive-grade mass production standards. 

Strictly following the IATF 16949 automotive quality system and ISO 26262 functional safety development process, it supports the full set of DV/PV high/low temperature, vibration, endurance, EMC and fault-injection tests for the x-by-wire chassis, directly satisfying OEM mass-production audit standards for premium models.

Model Selection Recommendation
Success Case
Fill in your email to get the latest updates.

We will keep you informed of the current use cases, new solutions and products, as well as training and events at any time. Please fill in your email address to subscribe for free.

Online message
  • *Name

  • *Company

  • *Phone

  • *Email

  • Message

Submit
Warning pop-up window