I wonder why GM is posting the battery aspects of this rig against SAE J1634 revision 2017 and not most recent revision 2021? Anyone familiar with SAE standards that can break that down in human speak?
EDIT:
I ran my question through AI... interesting...
Differences Between J1634_201707 and J1634_202104
1. Purpose and Scope The J1634 standard outlines procedures for measuring the energy consumption and range of battery electric vehicles (BEVs). The 201707 version primarily focused on establishing baseline methodologies for testing BEVs under specific conditions. In contrast, the 202104 version expands upon these methodologies, incorporating more recent advancements in technology and testing practices to provide a more comprehensive framework for evaluating BEV performance.
2. Testing Procedures The J1634_201707 version included basic testing protocols that were somewhat limited in scope. It provided guidelines for controlled laboratory conditions but did not fully address real-world driving scenarios. The J1634_202104 version introduces enhanced testing procedures that account for a wider variety of driving conditions, including urban, highway, and mixed environments. This change reflects an understanding that real-world performance can differ significantly from laboratory results.
3. Data Collection and Analysis In the earlier version (J1634_201707), data collection methods were relatively straightforward, focusing on key metrics like energy consumption per distance traveled. The updated version (J1634_202104) emphasizes a more sophisticated approach to data analysis, encouraging the use of advanced telemetry systems to gather detailed information about vehicle performance during tests. This includes factors such as temperature effects, battery state of charge variations, and other dynamic parameters that influence energy consumption.
4. Inclusion of New Technologies The 202104 revision incorporates considerations for newer technologies in electric vehicles, such as regenerative braking systems and advanced battery management systems. These technologies were either not addressed or only minimally covered in the 201707 version. By including these elements, the updated standard aims to provide a more accurate representation of modern BEV capabilities.
5. Regulatory Compliance The J1634_202104 version also aligns with evolving regulatory requirements concerning emissions and efficiency standards set by various governing bodies around the world. This ensures that manufacturers can utilize this standard to meet compliance obligations while also providing consumers with reliable information regarding vehicle performance.
In summary, the differences between J1634_201707 and J1634_202104 lie in their scope, testing procedures, data collection methods, inclusion of new technologies, and alignment with regulatory compliance, reflecting advancements in electric vehicle technology and a greater emphasis on real-world applicability.
