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Integrated Systems And Specialized Vehicles
Integrated Systems And Specialized Vehicles
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Industrial Intelligence
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Intelligent Transportation
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Standardized Decoding: How to Define the "Safety Bottom Line" and "Collaborative Language" for Intelligent Chassis?
Release time:
2026-03-20 16:45
As the automotive electrical/electronic architecture evolves toward centralization, the intelligent chassis, as the core carrier affecting vehicle handling, comfort, and active safety, is undergoing a profound transformation from a traditional distributed architecture to a domain controller centralized architecture. Against this backdrop, the China Society of Automotive Engineers (China SAE) approved and released two group standards, Hardware Functional Safety Requirements and Verification for Passenger Vehicle Intelligent Chassis Domain Controllers (T/CSAE 466-2025) and Communication Interface Requirements for Passenger Vehicle Intelligent Chassis Domain Controllers (T/CSAE 467-2025), providing the industry with unified technical specifications and design guidelines. As the primary lead unit for these two standards, Beijing Jingwei Hirain Technologies Co., Inc. (Hirain), in collaboration with multiple key industry enterprises, universities, and research institutions, jointly completed the compilation of the standards.
Adhering to the principles of "actionable, assessable, and forward-looking," the two standards achieve multiple innovations in technical content, offering clear technical guidance for the standardization and industrialization of intelligent chassis technology.
▎ T/CSAE 466-2025 Hardware Functional Safety Requirements and Verification for Passenger Vehicle Intelligent Chassis Domain Controllers
● Standard Positioning and Core Architecture
T/CSAE 466-2025 is a technical specification for the hardware functional safety of passenger vehicle intelligent chassis domain controllers. The standard systematically proposes requirements from multiple dimensions, including hardware design, safety mechanisms, redundancy architecture, fault handling, and test verification. It forms two main pillars: "Hardware Functional Safety Requirements" (defining what to do) and "Hardware Functional Safety Verification" (defining how to verify). These two pillars form a closed loop, ensuring the standard's implementability.
● Core Technical Highlights
✓ Dual MCU Redundancy + Independent Monitoring Architecture: The standard explicitly requires that when the system degradation mode is "fail-operational," a dual control chip (MCU) redundancy design must be adopted, along with a fault detection and safety processing module independent of the main control chip, to prevent the impact of microcontroller failures on vehicle safety.
✓ Comprehensive Coverage of Safety Requirements for Key Hardware Modules: The standard details detailed functional safety design requirements for microcontrollers, external expansion memory, power supply systems, communication modules, input interfaces (e.g., wheel speed, steering angle, pedal signals), and drive outputs (e.g., EPB motor, air spring solenoid valve), providing a solid foundation for hardware design.
✓ Emphasis on Independence and Self-Test Capability: Safety mechanisms must achieve physical or logical isolation from the modules they monitor and possess self-test capabilities to avoid latent failures that could lead to loss of safety functions.
✓ Quantified Safe State and Response Time Limits: For safety goals related to lateral, longitudinal, and vertical control, the standard specifies that a safe state transition must be completed within the Fault Handling Time Interval (FHTI), ensuring driving safety under extreme operating conditions.
✓ Multi-Dimensional Verification System: The standard proposes a multi-dimensional verification method encompassing durability testing, robustness testing, functional testing, and fault injection testing. It also includes appendices with test plans for reliability, EMC, electrical performance, etc., making the standard "assessable and implementable."
✓ Quantified Safety Metrics: Key hardware safety metrics such as Single-Point Fault Metric (SPFM), Latent Fault Metric (LFM), and Probabilistic Metric for Random Hardware Failures (PMHF) are specified with target values, providing quantitative basis for product development.
As the first domestic technical specification focused on the hardware functional safety of passenger vehicle intelligent chassis domain controllers, this standard addresses the industry-wide challenge of "how to design safe and reliable chassis domain control hardware." Its release signifies significant progress in China's core intelligent chassis technology field, providing a crucial technical foundation for the hardware functional safety of intelligent chassis domain controllers and playing an important role in promoting the high-quality development of intelligent connected vehicles.
▎ T/CSAE 467-2025 Communication Interface Requirements for Passenger Vehicle Intelligent Chassis Domain Controllers
● Standard Background and Objectives
As x-by-wire technologies such as brake-by-wire, steer-by-wire, and air suspension gradually enter vehicles, the chassis domain controller (or domain controllers with chassis functions) has become the hub for integrating longitudinal, lateral, and vertical control. However, varying interface definitions among different suppliers lead to collaboration difficulties. T/CSAE 467-2025 systematically proposes unified requirements for the communication interfaces of chassis domain controllers. Based on an easily producible electrical/electronic architecture, it provides a detailed definition of the intra-domain and extra-domain interfaces for the chassis domain controller, aiming to establish a common "language" for collaborative development across the industrial chain, thereby helping to break down industry collaboration barriers.
● Core Technical Content
The standard proposes a general architecture diagram for the chassis domain, which satisfies both current chassis x-by-wire technologies and incorporates a forward-looking intelligent chassis domain communication architecture. By systematically formulating interface specifications for the four major systems—braking, steering, suspension, and propulsion—it ultimately aims to realize a complete x-by-wire chassis solution based on the chassis domain controller. Its technical content is compatible with existing chassis technology application scenarios and prospectively supports the application of cutting-edge technologies like brake-by-wire and steer-by-wire. The release of this standard provides clear technical specifications for chassis domain controller interfaces and offers crucial support for the standardized development of the industry.
Currently, Hirain has launched the following two domain controller products that meet the requirements of the standards:
✓ Chassis Domain Controller (VMCU): Focused on chassis control, this controller adopts a dual control chip (MCU) redundancy design and can control dual electronic parking brakes (EPB), dual-chamber air springs, and dual-valve adjustable dampers (CDC). Simultaneously, it can collect information such as wheel speeds, electronic parking brake switch status, and vehicle body attitude (IMU) to achieve coordinated control of vehicle longitudinal, lateral, and vertical dynamics, resulting in smoother driving and more precise handling.
✓ Rear Domain Controller (Re-ZCU): Utilizing a single control chip (MCU), this controller retains chassis control functions such as single electronic parking brake (EPB), dual-chamber air springs, and dual-valve adjustable dampers (CDC). In addition, it integrates common body control functions – such as rear tailgate control, rear seat adjustment, rear air conditioning control, and rear lighting control. It consolidates chassis and partial body functions, helping to simplify the vehicle's electrical layout, reduce overall vehicle weight, and lower costs.
From vague technological roadmaps to clear standard establishment, and from isolated corporate practices to open industry sharing, these two standards not only unify technical language and development interfaces but also initially construct a "safe, reliable, collaborative, and efficient" technical framework for China's intelligent chassis sector. As the lead unit for the standards, Hirain, leveraging its deep expertise in functional safety, chassis electronics, and domain controllers, translates standard requirements into mature products and solutions. This empowers customers to efficiently develop safe and reliable intelligent chassis systems and aids the intelligent chassis industry's transition from early technological exploration to a new phase of standardized and systematic development, laying a solid foundation for the long-term health and scalable growth of the industry.
Looking ahead, Hirain will continue to uphold its core philosophy of "Value Innovation, Customer Service," persistently deepening its efforts in the fields of intelligent chassis and functional safety technology. It aims to provide customers with efficient and reliable system solutions, support China's intelligent connected vehicle industry in overcoming core technological bottlenecks, and strive to achieve a leapfrog development from "technology follower" to "standard leader."
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