Performance Prediction of Automotive Air Conditioning System for Different Driving Cycle Conditions

Transcription

1 Performance Prediction of Automotive Air Conditioning System for Different Driving Cycle Conditions Rangarajan S a, Yamamuro Tsuyoshi b, SasiKumar M a, Kubo Masaaki b, Anand G a a Renault Nissan Technology and Business Centre India Pvt. Ltd., Chennai, India b NISSAN MOTOR CO., Ltd., Okatsukoku, Atsugi, Kanagawa, Japan CAE-2 System Simulation GT-SUITE User Conference Dec 07, 2015

2 Outcome of the seminar 1. Calibration of Mobile AC Components 2. Types of Compressor and its control logics 3. Performance of AC system for different driving cycle 4. Fuel consumption study with AC - ON/OFF 5. Conclusion 2

3 CONTENTS Contents 1. Introduction 2. Performance of AC system 3. Conclusion 3

4 1 INTRODUCTION About the Company - RNTBCI Renault Nissan Technology & Business Centre India Pvt. Ltd. is a joint venture, established under the Renault Nissan Alliance on 21st September, We cater to the localization needs of Renault and Nissan in various research, business and automotive technologies such as Advanced Research and Development, Advanced CAE (Computer-Aided Engineering), Product Development, Digital Vehicle Development and Information Systems Development. We are a captive centre, that also has an in-house Software development centre and Purchase Global purchasing organization. Currently, we have a workforce of employees. Technology R & AE Vehicle & P/Train Global Engineering Support Process Engineering Cost Estimation IS/IT Business Purchasing BPO Shared Service Center 4

5 1 INTRODUCTION Scope Physical Layout Simulation Layout Deliverables Image courtesy to rowleystires.com 5

6 1 INTRODUCTION Evolution of AC Compressor Image courtesy to Delphi Fixed Displacement Compressor Variable Displacement Compressor Image courtesy to Denso Image courtesy to Prideautocare.com Image courtesy to Sanden Variable Speed Electric Compressor 6

7 1 INTRODUCTION Simulation Steps Component Level Calibration of MAC Components Condenser Evaporator Compressor Thermal Expansion Valve Component Heat Exchanger Nusselt Correlation fit Compressor Performance Map data TXV 4 Quadrant Chart System Control Level Logic Validation System Integration Condenser Evaporator Compressor Thermal Expansion Valve Control Strategy Compressor control logic Duty Calculation PI Controller Driving Cycle Cool Down 5Cycle LA4 System Level Control Logic Validation Charge quantity optimization Blower and Condenser air flow rate Compressor Speed and Initial temperatures T devapair Vs Clutch engagement FDC P s Vs % duty (Displacement) VDC T devapair Vs % duty (N compressor ) VSEC Evaporator & Condenser air outlet temperature Cabin Temperature Compressor torque Fuel Consumption 7

8 1 INTRODUCTION MAC Component Calibration Compressor Components Calibration Parameters Results Mass flow Multiplier Efficiency Multiplier Heat Exchangers Condenser / Evaporator Heat Transfer Multiplier Friction Multiplier 8

9 1 INTRODUCTION MAC Component Calibration Components Calibration Parameters Results TXV TXV time constant 1st Quadrant Temp (K) Pressure (bar) Lift (mm) 3 rd Quadrant Mass Flow Rate (kg/s) nd Quadrant Pressure (bar) Lift (mm) Source: Data from GT-TXV tutorial model Cabin Cabin Lumped Mass Internal HTC 9

10 CONTENTS Contents 1. Introduction 2. Performance of AC system 3. Conclusion 10

11 2 PERFORMANCE OF AC SYSTEM AC Performance - Fixed Displacement Compressor Objective A/C Cycle performance for Fixed Displacement Compressor (FDC) Inputs Results Hot Environment [Temp (ºC) & R.H (%)] COMP ON/OFF based on Td evapair Vehicle Speed - V1, V2 and Idling Challenges AC Pipes ( suction side) heat pick-up (thermal inertia loss) has impact on evaporator air outlet temperature. 11

12 2 PERFORMANCE OF AC SYSTEM AC Performance - Variable Displacement Compressor Objective A/C Cycle performance with Variable Displacement Compressor (VDC). Effect of fuel consumption on Fixed and Variable displacement compressor. Results Challenges Modeling of VDC using PI Control logic and validation of compressor displacement. 12

13 2 PERFORMANCE OF AC SYSTEM Fuel Consumption Study Fuel Consumption Study Comparison between FDC & VDC Outcome Torque on VDC is Lower than FDC. Effect of fuel consumption on VDC Lower than FDC. Fuel economy for VDC higher than the FDC. 13

14 2 PERFORMANCE OF AC SYSTEM AC Performance - Variable Speed Electric Compressor Objective To predict HEV A/C Cycle performance for a Fixed displacement type Variable Speed Electric Compressor (VSEC) model driven by inverter. Results Challenges Modeling of VSEC using PI Control logic and modeling of thermocouple object Lag response for evaporator air outlet temperature. 14

15 Contents 1. Introduction 2. Performance of AC system 3. Conclusion 15

16 3 CONCLUSION Conclusion Simulation results of AC Cycle performance are were well correlated with test data Fuel consumption was found to be less in VDC comparison with FDC. Using system simulation we can reduce number of prototype testing and its cost avoidance Challenges Detail geometry inputs required for Heat exchangers & Cabin. Performance map data TXV & Compressor. Heat Pick-up (thermal inertia loss) on AC Cycle pipes. 16

17 Thank You 17