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Summary of Vehicle Test Validation Results with Dynamometer Analysis

This document provides a summary of the vehicle test validations conducted using a dynamometer. It highlights measurements across various drivability conditions, comparing results from different vehicles in cold and warm cycles. Key observations include engine speed inconsistencies during gear shifts and their impact on drivability performance. Proposals for improving drivability and engine management are presented, focusing on reducing risks of engine cut-off and enhancing repeatability during tests. The analysis covers standard tests, CO2 emissions, and thermal management aspects of light-duty vehicles.

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Summary of Vehicle Test Validation Results with Dynamometer Analysis

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  1. WLTC VALIDATION 1 14/10/2011- M. CAPITAINE

  2. SUMMARY • VEHICULE TEST • DYNAMOMETER • MESUREMENTS • TEST SUMMARY • DRIVABILITY • COMPARAISON JAPAN/STEVEN • DRIVABILITY => ~CO2 • THERMO MANAGEMENT

  3. VEHICULE TEST

  4. DYNAMOMETER DYNAMOMETER FOR LIGHT-DUTY VEHICULES STANDARD TESTS

  5. MESUREMENTS

  6. TESTS SUMMARY Comment : Same driver for all tests

  7. DRIVABILITY LOW / VEHICULE A / GEAR SHIFT JAPAN / COLD TEST SUMMARY ROLLER SPEED

  8. DRIVABILITY MIDDLE / VEHICULE A / GEAR SHIFT JAPAN / COLD TEST SUMMARY ROLLER SPEED

  9. DRIVABILITY HIGH / VEHICULE B / GEAR SHIFT JAPAN / COLD TEST SUMMARY ROLLER SPEED • DURING SMALL DECELERATIONS : • SPEED MANAGEMENT DONE WITH ACCEL PEDAL (NO BREAK PEDAL) • REPETABILITY DETERIORATED

  10. DRIVABILITY EXT-HIGH / VEHICULE B / GEAR SHIFT JAPAN / COLD TEST SUMMARY ROLLER SPEED TARGET SPEED IS HARD TO FOLLOW (ENGINE IN FULL ACCEL)

  11. DRIVABILITY OBSERVATIONS SYNTHESIS & PROPOSALS • LOW • Observation : Engine speed too low during some low speed phases • Cause : Gear shift engaged too long • Result : Risk of engine cut-off • Proposal : Disengage gear shift earlier • MIDDLE • Observation : Engine speed too high during some accelerations having engaged • Cause : Gear shift 1 • Result : Engine point unrepresentative of reality • Proposal : Gear shift 2

  12. DRIVABILITY OBSERVATIONS SYNTHESIS & PROPOSALS • HIGH (& ALL PHASES) • Observation : Speed management with accel pedal during some of the small decelerations • (engine break or small acceleration, but not with the break pedal => Otherwise with the speed was out of the tolerances) • Result : Risk of deterioration of the repetability (??) • EXTRA-HIGH (& HIGH PHASE MAIN ACCELERATION, DEPENDING ON ENGINE POWER) • Observation : Target speed is hard to follow during the main acceleration • Cause : Engine in full acceleration (depending on engine power) • Result : • Vehicule cannot follow the cycle • Deteriorates the repetability • Proposal : Limit the acceleration (not speed)

  13. COMPAR JAPAN / STEVEN No fundamental difference of drivability between the two gear shift procedures, but changes engine speed :

  14. DRIVABILITY => ~CO2 • Significant dispersion in the Extra-High cycle • Cause : Engine in full acceleration

  15. DRIVABILITY => ~CO2 • Significant dispersion in the Extra-High cycle • Possible cause : Engine in full acceleration

  16. THERMO MANAGEMENT • ENGINE HOT AT HALF OF THE MID CYCLE

  17. THERMO MANAGEMENT • HOT FROM THE HALF OF THE LOW CYCLE

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