Evaluation of control set points for Dual Use Heater Core and AGS using a 1D transient Thermal model

Topics for discussion

1. What are Dual Use Heater Core (DUHC) and Active Grill Shutters (AGS) technologies?

2. 1D Powertrain Thermal Model

3. Evaluate control set points of DUHC and AGS

2

Active Grill Shutters

AGS• Shutters in front of the cooling pack

that partially block the airflow from going through the cooling pack to reduce drag

• “EPA will provide a credit for active aerodynamic technologies that can demonstrate a reduction in aerodynamic drag of 3% or more. The credit will be 0.6 g/mile for cars and 1.0 g/mile for trucks when the reduction in aerodynamic drag is around 3%”

3

Dual Use Heater Core Technology

Dual Use Heater Core Technology – 3 modes of operation

5

AC OFF, Cooling ON AC ON, Cooling ON

HEAT ON, Cooling ON

The Crowded Space – Set Points

6

1D Thermal System Model in Flowmaster

7

Effect of DUHC on AGS

Paper # (if applicable) 8

Scenario 1 – No overlap

9

Scenario 1 – No overlap

Paper # (if applicable) 10

Scenario 1 – No overlap

Paper # (if applicable) 11

Scenario 2 – Effect of Gap between set-points

12

Scenario 2 – Effect of Gap between set-points

13

Scenario 3 – Increase in AGS activation time

14

Scenario 3 – Increase in AGS activation time

Take-aways

a) Need Active Thermal Management to make technologies play well together

b) A successful application of 1D engine thermal model to analyze the benefits of complementary but interfering technologies

c) The DUHC technology provides supplemental cooling to the engine and enables the AGS to remain closed for longer periods during road load driving conditions. The DUHC also increases the trailer tow rating of the vehicle by providing additional engine cooling.

d) For lower speeds, the overlap of the thermostat set point with the DUHC and the AGS have minimal impact on their efficacy as the system is airflow limited.

e) Increasing the AGS duration by moving the AGS shut of temperature to an earlier temperature is a trade-off between AGS cycling and AGS closure rate

16

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Founder and Principal InvestigatorSudhi Uppuluri has over 16 years of experience in the simulation industry. He worked as a consulting engineer and sales manager at Flowmaster USA for 8 years. He has various technical publications on related subjects in SAE and AIAA journals. He holds a Masters in Aerospace Engineering from the University of Illinois at Urbana-Champaign and a Certificate in Strategy and Innovation from the MIT Sloan School of business.

Recent technical publications

Uppuluri, S., Proulx, J., Marovic, B., and Naiknaware, A., "Characterizing Thermal Interactions Between Engine Coolant, Oil and Ambient for an Internal Combustion Engine," SAE Int. J. Engines 6(2):827-832, 2013, doi:10.4271/2013-01-0960.

Scott, T., Chang, F., Khandaker, M., and Uppuluri, S., "Transient Thermal Modeling of Power Train Components," SAE Int. J. Passeng. Cars - Mech. Syst. 5(2):962-973, 2012, doi:10.4271/2012-01-0956.

Uppuluri, S., Computational Sciences Experts Group; Sadek S. Rahman, Chrysler Group LLC, “Active Transient Thermal Management for improved Fuel economy”, 2012 SAE Thermal Management System Symposium

Chang, F., Malipeddi, S., Uppuluri, S., and Shapiro, S., "Underhood Thermal Management of Off-Highway Machines Using 1D-Network Simulations," SAE Technical Paper 2003-01-3405, 2003, doi:10.4271/2003-01-3405.

Uppuluri, S., Naiknaware, CSEG, LLC,“Evaluation of Various Engine Control Strategy for Optimal Engine Thermal Operation”, 2014 SAE World Congress: Oral Only Talk

Uppuluri, S., CSEG, LLC,“Analysis Led Design and Industry Trends in 1D Powertrain Simulation”, 2013 SAE World Congress: Oral Only Talk

Uppuluri, S., CSEG, LLC, “Dual use heater core for better trailer tow rating”, 2013 SAE Thermal Management System Symposium, Oral Only Talk