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Article by: Suguru Nakajima, Project Manager, Braking Systems in Applus IDIADA
Read part one HERE | part two HERE
Benchmarking plays a crucial role in the automotive industry, allowing manufacturers to compare their vehicles with competitors, analyze performance, identify areas for improvement, and maintain competitiveness in an evolving market.
The first part of this article introduced the benchmarking activities performed by Applus IDIADA, with special interest in the state-of-the-art braking systems for EVs. That text covered the gathering of specifications for a particular example vehicle, as well as presenting some pedal feeling results. The second part continued with the testing program, dealing with brake blending, reaction time, stopping distance, etc. This third and last part of the article covers the last test (creep groan), and presents some future steps and recommendations.
2.6 Creep Groan:
Assessment of low frequency noise (creep groan) which is considered a major concern for EVs:
- Test conditions: Usage of standardized VDA314 method for full vehicle brake creep groan analysis.
- Results:
- Metrics: Subjective evaluations and Sound Pressure Levels (SPLs).
Key Findings and Observations:
- Creep groan analysis, following VDA314 methodology, becomes increasingly important in EVs due to reduced friction brake usage, requiring comprehensive evaluation of both subjective and objective parameters.
Future Directions and Recommendations:
- Expand Thermal Analysis: Develop an objective evaluation of the de-rating strategy of the powertrain to provide insights into thermal management and performance under various conditions.
- Enhanced User Experience Studies: Conduct research on user preferences for regenerative braking levels to provide valuable market and marketability perspectives.
- Integration with ADAS Systems:
- Evaluate interaction between regenerative braking and advanced driver assistance systems.
- Study the impact on emergency braking scenarios.
- Assess performance with upcoming autonomous driving features.
- Extended Environmental Testing: Investigate the effects of extreme temperatures on regenerative braking efficiency, despite the potentially high cost of such test scenarios.
- Energy Recovery Optimization:
- Investigate potential improvements in energy recovery strategies.
- Analyze the balance between comfort and maximum energy recuperation.
- Develop standardized testing procedures for energy recovery efficiency.
In conclusion, the advanced brake benchmarking for EVs presented in this article highlights the significant changes in braking technology and performance evaluation necessitated by the shift towards electric vehicles. The integration of regenerative braking, sophisticated blended braking systems, and the need for new testing methodologies underscore the complexity of modern EV braking systems.
About Applus IDIADA
With over 25 years’ experience and 2,450 engineers specializing in vehicle development, Applus IDIADA is a leading engineering company providing design, testing, engineering, and homologation services to the automotive industry worldwide.
Applus IDIADA is located in California and Michigan, with further presence in 25 other countries, mainly in Europe and Asia.
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