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

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

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.

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

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.

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

Toolchain Development: Hybrid Test with GT-SUITE

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

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

• 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:

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

HEV Toolchain Development: Hybrid Test - Driver II

• Driver II

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

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.

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

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

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

Result: Vehicle Speed

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

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

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

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.

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

Driver IDriver IITest

Toolchain Development for Hybrid Drivability Assessment & Improvement

1. Introduction

2. Toolchain development

3. Test Case and Result

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.

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

Thanks for your attention!

CEVT - Powertrain Engineering

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