GB/T 18276-2017 in English

Interpretation of the National Standard of the People's Republic of China GB/T 18276—2017

1. Background and significance of the standard revision

GB/T 18276—2017 replaces the original GB/T 18276—2000, and mainly optimizes and improves the dynamic bench test methods and evaluation indicators of in-use commercial vehicles. New standard:

• Limited scope of application to in-use commercial vehicles equipped with spark ignition or compression ignition engines
• Added the definition of the term "drive wheel output power" to replace the terms "net power" in the old version
• Added specific requirements for test equipment, test preparation and result evaluation
• Adjusted the test method and deleted the contents of acceleration time, coasting distance and time test

2. Comparative analysis of standard framework

3. Interpretation of core technical points

The core of the standard is to measure the output power of the drive wheel or the wheel-side stable vehicle speed through the chassis dynamometer as an indicator for evaluating the dynamic performance of the vehicle. The key parameters include:

• Maximum torque condition: used to measure the output capacity of the engine at the peak torque point
• Rated power condition: evaluates the continuous output capacity of the engine at rated speed
• Drive wheel output power: comprehensively reflects the power transmission efficiency and mechanical status

4. Implementation Suggestions and Notes

This standard provides a unified technical basis for the dynamic performance evaluation of operating vehicles. It is recommended that relevant testing institutions strictly follow the standard requirements to equip chassis dynamometers that meet the technical requirements of JT/T 445, and regularly calibrate the equipment to ensure measurement accuracy.