| Item | Specification |
| System Name | Steering by Wire (SbW) |
| Maximum Rack Force | 20,000N |
| Power Supply | Distributed Dual Power Supply Redundancy |
| Position Sensing | Distributed Dual Rack Position Sensors |
| Mechanical Transmission | Dual Mechanical Transmission System Redundancy |
| Controller Design | Distributed Dual Controllers (ASIL D) |
| Communication Backup | Four Private CAN Backup Channels |
| Operating Voltage Range | 6-18V (Typical) |
| Operating Temperature Range | -40℃ ~ 85℃ |
| Functional Safety Level | ASIL D |
| IP Rating | IP69 (Dustproof & Waterproof) |
| OTA Update Support | Supported (Including Rollback Function) |
Steer-By-Wire (SBW) is an advanced steering technology that replaces traditional mechanical steering connections with electronic signals, consisting of steering wheel module, ECU and actuator. As a core hardware for L3+ autonomous driving, SBW is crucial for enhancing driving safety, optimizing driving experience and enabling flexible vehicle design. The SBW technology trends toward high integration, cost reduction and widespread adoption, with core features including steering decoupling, variable steering ratio and full redundancy. Dowway, a key player in the SBW industry, boasts strengths in advanced material solutions, precise system integration and reliable ASIL-D compliant safety technologies.
Steer-By-Wire (SBW) Basic Principle
The core of Steer-By-Wire (SBW) technology lies in eliminating mechanical links between the steering wheel and wheels, realizing complete decoupling of steering input and output. The SBW system operates through electronic signal transmission: sensors on the steering wheel convert the driver’s steering intention into electronic signals, which are transmitted to the electronic control unit (ECU). The ECU processes the signals by integrating real-time data such as vehicle speed, and then issues control commands to the steering actuator to drive wheel steering. Meanwhile, the torque simulator in the system provides natural road feedback to the driver, ensuring a comfortable driving feel.
Steer-By-Wire (SBW) Application Necessity
Steer-By-Wire (SBW) has obvious application necessity in multiple dimensions. In terms of safety, SBW optimizes collision protection design, reducing the risk of leg injury by 30% in collisions, and adopts multi-level redundancy design to meet ASIL-D safety standards, ensuring driving safety. In terms of driving experience, SBW realizes variable steering ratio, which is flexible at low speeds and stable at high speeds, and supports personalized steering feel adjustment. For autonomous driving, SBW is a core supporting hardware that enables stationary or retractable steering wheels. In addition, SBW eliminates traditional mechanical structures, releasing 20% of the engine compartment space and improving vehicle design flexibility.
Steer-By-Wire (SBW) Development Trend
The global Steer-By-Wire (SBW) market shows a rapid growth trend. It is expected to grow from 2.31 billion yuan in 2025 to more than 30 billion yuan in 2030, with a compound annual growth rate (CAGR) of 67.1%, and the market penetration rate is expected to reach 30% by 2030. Cost reduction is a key driver of SBW’s mass-market adoption: the cost of SBW systems is expected to drop below 4,000 yuan in 2025 and further to 2,500-3,000 yuan in 2030. The main development trends of SBW technology include high integration with chassis through “corner modules” and software-defined OTA upgrade capabilities.
Steer-By-Wire (SBW) Technical Characteristics
Steer-By-Wire (SBW) has five core technical characteristics: 1. Full steering decoupling, laying the foundation for flexible steering adjustment; 2. Dynamic variable steering ratio, adapting to different driving speeds; 3. Millisecond-level fast response, improving driving stability; 4. Triple redundancy design, meeting ASIL-D safety standards; 5. Programmable road feel, filtering useless vibrations while retaining critical road feedback to enhance driving comfort.
Dowway’s Competitive Advantages in Steer-By-Wire (SBW) Industry
Dowway has unique competitive advantages in the Steer-By-Wire (SBW) industry: 1. Advanced material support: Providing high-performance silicone elastomers and conformal coatings to ensure SBW system durability under extreme conditions; 2. Excellent system integration capability: Realizing seamless connection between SBW systems, chassis and autonomous driving systems, and optimizing algorithms to balance driving comfort and stability; 3. Reliable safety compliance: Self-developed multi-level redundancy design to ensure ASIL-D safety standard compliance; 4. Customization and mass production support: Offering customized SBW solutions for various vehicle types and supporting rapid market launch; 5. Deep autonomous driving synergy: Leading in integrating SBW with L3+ autonomous driving technologies, supporting silent/retractable steering wheels and other functions.
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