This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Controlling Variable Coolant Temperature in Internal Combustion Engines and its Effects on Fuel Consumption
Technical Paper
2014-32-0064
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Increasing the efficiency and durability of internal combustion engines is one of the major concerns of engineers in the development of modern road vehicles. Emission legislations are becoming intensively strict each year, forcing manufacturers to deploy sophisticated engine control strategies. The engine coolant temperature is conventionally controlled with mechanical elements such as wax-thermostat and belt-driven mechanical water-pump, which result in engine temperature fluctuations and delayed response to variable inputs.
Variable coolant temperature is beneficial; it can decrease the hydrodynamic frictional losses of lubricated engine parts in light duty conditions. Moreover it improves performance and protects engine parts from thermal stresses and sealing failure in heavy duty conditions.
In this paper the feasibility of controlling coolant temperature is examined in different driver demand conditions using electric flow-control valve replacing conventional thermostat. Urban, extra urban and highway cycles are tested on Honda insight 2003 (without the electric motor) from Advisor software vehicle simulator. The engine conditions, speed and load, in corresponding cycles have been derived and used as an input to Matlab Simulink model consisting of engine cooling components, table of optimized coolant temperature and Brake Specific Fuel Consumption calculation algorithms.
We demonstrated that fuel consumption savings of more than 1% in urban and extra-urban cycles can be achieved, however fuel consumption in highway cycle show negligible advantage. The system responds quickly to cooling since there is an amount of cold water reserved in the radiator; however the response is delayed in warming trends.
Recommended Content
Authors
Topic
Citation
Khanjani, K., Deng, J., and Ordys, A., "Controlling Variable Coolant Temperature in Internal Combustion Engines and its Effects on Fuel Consumption," SAE Technical Paper 2014-32-0064, 2014, https://doi.org/10.4271/2014-32-0064.Also In
References
- Sandoval , D. and Heywood , J. An Improved Friction Model for Spark-Ignition Engines SAE Technical Paper 2003-01-0725 2003 10.4271/2003-01-0725
- Choukroun , A. and Chanfreau , M. Automatic Control of Electronic Actuators for an Optimized Engine Cooling Thermal Management SAE Technical Paper 2001-01-1758 2001 10.4271/2001-01-1758
- Pang , H. , Brace , C. , and Akehurst , S. Potential of a Controllable Engine Cooling System to Reduce NOx Emissions in Diesel Engines SAE Technical Paper 2004-01-0054 2004 10.4271/2004-01-0054
- Thomas , S. , Saroop , A. , Rajak , R. , and Muthiah , S. Investigation on the Effect of Coolant Temperature on the Performance and Emissions of Naturally Aspirated Gasoline Engine SAE Technical Paper 2011-26-0089 2011 10.4271/2011-26-0089
- Koch , F. and Haubner , F. Cooling System Development and Optimization for DI Engines SAE Technical Paper 2000-01-0283 2000 10.4271/2000-01-0283
- Eberth , J. , Wagner , J. , Afshar , B. , and Foster , R. Modeling and Validation of Automotive “Smart” Thermal Management System Architectures SAE Technical Paper 2004-01-0048 2004 10.4271/2004-01-0048
- Allen , D. and Lasecki , M. Thermal Management Evolution and Controlled Coolant Flow SAE Technical Paper 2001-01-1732 2001 10.4271/2001-01-1732
- Ribeiro , E. , de Carvalho Meira , J. , and de Andrade Filho , A. Electric Valve for Coolant Temperature Control (TCV) SAE Technical Paper 2007-01-2791 2007 10.4271/2007-01-2791