Domestic MCU Progress in New Energy Vehicle Control Systems

The push for automotive chip localization in China has accelerated domestic MCU adoption in new energy vehicles. Over the past two years, penetration rates in body control modules (BCM) have climbed to approximately 20–25%, driven by cost advantages and improved supply chain stability. In battery management systems (BMS), domestic MCUs now account for roughly 10–15% of new designs, though high-reliability requirements continue to limit wider deployment.

BCM applications have become a beachhead for domestic MCU suppliers due to lower complexity and less stringent safety requirements. Products based on ARM Cortex-M0/M3 cores now handle tasks such as window lift, door lock, and lighting control. For BMS, domestic MCUs are increasingly used in cell monitoring units where redundancy is not critical, but their presence in master controllers remains low. The main barriers are insufficient analog peripheral accuracy and limited support for multiple communication protocols like CAN-FD and daisy-chain architectures.

The most formidable barrier remains functional safety certification, particularly ASIL-D for safety-critical subsystems such as brake-by-wire or steering. Domestic MCU suppliers face challenges in developing hardware fault detection mechanisms, dual-core lockstep architectures, and comprehensive safety documentation that meets ISO 26262 requirements. Without a certified ecosystem of software libraries and toolchains, even technically capable chips struggle to gain approval from tier-1 suppliers and automakers for the highest integrity levels.