toolchain development for hybrid driveability assessment ... · accelerator pedal position...

Toolchain Development for Hybrid Driveability Assessment & ImprovementDr. Jianning ZHAO,

MSc S. DENG,

MSc E. FICHERA,

Dr. S. KLACAR

Dr. J. Zhao, S. Deng, E. Fichera, Dr. S. Klacar, CEVT, Sweden

Toolchain Development for Hybrid Drivability Assessment & Improvement

1. Introduction

2. Toolchain development

3. Test Case and Result

4. Summary

Introduction: Automotive Product Challenges

• Strict CO2 emission legislations

• High expectation of excellent driveability

• Shortened development cycle

Figures from left to right are from ICCT, Statista, and AVL, respectively.

Introduction: Continuous Driveability Improvement

• V-cycle-based development process in CEVT/GPRI, especially for complex hybrid powertrains

• Hybrid driveability assessment and improvement in early powertrain design phase

• Dedicated driveability optimization in latter integration phase

Definition Qualification

Implementation

IntegrationDesign

Production


Introduction: Objective

• Based on GT-SUITE 0D/1D simulation, developing driveability toolchain in order to

• Front-load driveability assessment and improvement at powertrain system level,

• Front-load propulsion system and component design for vehicle requirements.



1. Introduction



4. Summary

Toolchain Development: Generic Approach

• Aiming to driveability assessment and improvement, toolchain starts with

• Hybrid Test via virtual test based on GT-SUITE,

• Test Data Handling for automated process,

• Driveability Assessment by AVL-Drive giving driveability rates.

• Driveability is improved by iteratively strengthened concept.


Toolchain Development: Hybrid Test with GT-SUITE

• Based on 0D/1D models, GT-SUITE simulates following relevant signals for hybrid powertrains.


• Longitudinal Vehicle Acceleration,

• Vehicle Speed,

• Engine Speed ,

• Electric Machine Speed,

• Electric Machine Torque,

• Battery SOC,

• Battery Voltage,

• Battery Current,

• Current Gear Number.

• Accelerator Pedal Position,

• Brake State,

• Brake Pedal Position.

HEV Toolchain Development: Hybrid Test - Driver I

• Driver I:


HEV Toolchain Development: Hybrid Test - Driver II

• Driver II


Driver II

Driver II:

HEV Toolchain Development: Hybrid Test - Comparison

• Compared with Driver I, Driver II

• Heavily influences powertrain operation,

• Significantly affects tracing reference speed,

• Close to real driving condition,

• Fully involved in simulation process.



1. Introduction



4. Summary

Test Case: Hybrid Vehicle

• Main characteristics

• C-segment SUV

• P2.5 HEV

• Dual clutch transmission of 7 speeds

• Dedicated hybrid engine of 3 cylinders

• Test cycles

• Geely Cycle


Result: Vehicle Speed


Vehicle Speed comparison between test and Driver I

Vehicle Speed comparison between test and Driver II

• Simulated speed of two drivers in GT-SUITE was compared with reference Geely Cycle.

• Both Driver I and II can follow the reference speed.

• Detailed comparison will be performed after collecting complete test data.

Result : Accelerator Position


Accelerator pedal position comparison between test and Driver I

Accelerator pedal position comparison between test and Driver II

• Simulated accelerator pedal position of Driver I and II was compared with measured one.

• Driver I cannot approximate accelerator pedal position well due to simplified model data applied.

• Driver II reached better magnitude level yet with frequent signal fluctuations.

Results: Hybrid Driveability Comparison

• Driveability comparison among measurement, Driver I and II over Geely City Cycle.

• Overall rating of Driver I was closer to test data compared to Driver II.

• Different of overall rating of Driver I and II may be caused by poor quality of accelerator signal.


Driver IDriver IITest


1. Introduction



4. Summary

Summary

• Conclusion

• Toolchain for hybrid driveability assessment and improvement was developed based on GT-SUITE 0D/1D simulation and AVL-Drive.

• Two driver models were examined in GT-SUITE for better signal generation.

• Perspective

• Relevant signal correlation with complete test data is ongoing.

• Driver III based on GT-SUITE advanced drive object will be investigated for smoother signals.


Thanks for your attention!

CEVT - Powertrain Engineering


toolchain development for hybrid driveability assessment ... · accelerator pedal position...

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