Prime Time Evaluation for Engine Lubrication System

Transcription

1 Prime Time Evaluation for Engine Lubrication System Model based approach by using GT-SUITE Shuran Cheng FCA US LLC Yifan Zhou DEP Meng Li DEP Wei Tao FCA US LLC Powertrain Virtual Engineering GT 17 - Plymouth, MI 2017 FCA US LLC

2 Objective Develop oil circuit analytical models to Predict time for the oil to reach target component Optimize lubrication system to reduce the prime time Prime Time = pump fill time + circuit fill time Time for the oil to flow from pickup tube to the lubrication system. pump fill time circuit fill time Oil Circuit of Pentastar Upgrade 2

3 Normalized Pressure Critical Input Parameters Design parameters: 1. Oil circuit geometry (length, width ) 2. Bearing geometry (diameter, clearance, groove ) 3. Oil pump design Hydraulic component pressure vs flow rate curve 1. Cam Phasers 2. Piston cooling jets (PCJ) 3. Hydraulic lash adjusters (HLA) Cylinder pressure Initial condition 1. Temperature 2. Composition Cylinder Pressure Crank Angle [degree] 3

4 Engine Speed Simulation Assumptions Oil Type: 5W30 Constant oil temperature: -20C Standard predictive components are used for priming analysis Initial composition: 100% air Engine Speed Nominal bearing clearances Time vs engine speed profile Time 4

5 Model Building from CAD GT-SPACECLAIM GEM3D GT-ISE Import CAD model into GT-SPACECLAIM and extract fluid core Export fluid core to GEM3D and create 1D model for GT-ISE Complete model setup and run from GT-ISE All three images in this slide: Courtesy Gamma Technologies; used with permission 5

6 Engine Lubrication Model Oil Circuit Model Cranktrain Oil pump (vane) Note: Adapted from Gama Technologies demo models. 6

7 Oil Pump Model A detailed oil pump model is built and used in this simulation Build the pump model from a CAD model in GEM3D; Vanes, rotor and control valve are included; The model can predict the flow rate of the pump; Aeration effect can be considered. Courtesy Gamma Technologies; used with permission 7

8 Pressure Prediction Correlation Prime Time Correlation Pressure at Main Oil GT Simulation Test Time Simulation correlates well with the test data. 8

9 Volume Fraction Prime Time Change due to Different Designs 100 Air Volume in Cylinder Head Optimized Design 40 Courtesy Gamma Technologies; used with permission 20 0 Baseline Design Design Proposal 1 Design Proposal 2 Time Different design proposals will change the time for the oil to fill the system 9

10 Volume Fraction Prime Time Change due to Different Temperatures 100 Air Volume in Cylinder Head Courtesy Gamma Technologies; used with permission C 25C Time Different temperatures will change the time for the oil to reach the whole system 10

11 Priming Results Animation Animation to visualize total air volume fraction and oil volume fraction in the system. 100% Air 100% Oil Note: Adapted from Gama Technologies demo models. 11

12 Priming Results Animation Animation to visualize pressure distribution in the system. Pressure (abs. bar) Note: Adapted from Gama Technologies demo models. 12

13 Conclusions GT-SUITE is capable of predicting the prime time of engine lubrication system. GT-SUITE simulation result correlates well with the dyno test. The model can be used to evaluate different designs in order to reduce prime time. 13

14 Q & A 14