Application of J1939 to OBD2 cable in new energy vehicles

Application of J1939 to OBD2 cable in new energy vehicles

In new energy vehicles, J1939 to OBD2 cables are mainly used for diagnostic interface adaptation, data acquisition and monitoring, charging station communication, and cross brand vehicle compatibility. Its core value lies in realizing the conversion between J1939 protocol and OBD2 standard interface, thereby meeting the communication needs of new energy vehicles in diagnosis, maintenance, and charging processes. The following are specific application scenarios and analysis:

1、 Diagnostic interface adaptation and data acquisition

Diagnostic interface adaptation: The diagnostic interface of new energy vehicles usually adopts the 16 pin universal connector (OBD2 interface) defined in ISO 15031-3, which supports multiple communication protocols. However, some new energy vehicles, especially commercial models, may adopt J1939 protocol as the internal communication standard. The J1939 to OBD2 cable undergoes physical layer conversion, allowing diagnostic tools to access the J1939 network through the OBD2 interface and read vehicle status information, fault codes, and other data.

Data collection and monitoring: During the research and development, testing, and after-sales service stages of new energy vehicles, engineers need to collect vehicle operating data to analyze performance, optimize control strategies, or diagnose faults. The J1939 to OBD2 cable can be connected to a data logger or diagnostic software to real-time collect key parameters such as engine speed, battery status, and motor temperature, providing data support for vehicle optimization.

2、 Charging station communication is compatible with standards

Charging station communication: The J1939 to OBD2 cable achieves communication between the charging station and the vehicle BMS through protocol conversion, ensuring the safety and efficiency of the charging process.

Standard compatibility: With the expansion of the new energy vehicle market, there are differences in the communication protocols used by different brands of vehicles. The J1939 to OBD2 cable, through standardized interface design, is compatible with multiple vehicle models, reducing the adaptation cost of charging stations and diagnostic equipment and promoting industry standardization development.

3、 Vehicle compatibility and fleet management

Vehicle compatibility: In fleet management, vehicles may come from different manufacturers and their communication protocols may differ. The J1939 to OBD2 cable converts protocols, allowing the same diagnostic tool to adapt to different brands of vehicles, simplifying management processes and improving operational efficiency.

Third party device access: For third-party device manufacturers, J1939 to OBD2 cables provide a unified interface standard, reducing product development complexity. Equipment manufacturers do not need to develop adaptation layers or protocol converters for different vehicle models to achieve communication between devices and vehicles.