# Method for Determining Thermal Resistances in Coupled Simulator: For Electric Valve Timing Control System

Paper #:
• ## 2015-01-1301

Published:
• 2015-04-14
DOI:
• 10.4271/2015-01-1301
Citation:
Yoneya, N., Yamasaki, M., Yamanaka, A., Mikawa, K. et al., "Method for Determining Thermal Resistances in Coupled Simulator: For Electric Valve Timing Control System," SAE Technical Paper 2015-01-1301, 2015, doi:10.4271/2015-01-1301.
Author(s):
Affiliated:
Pages:
8
Abstract:
We developed a thermal calculation 1D simulator for an electric valve timing control system (VTC). A VTC can optimize the open and close timing of the intake and exhaust valves depending on the driving situation. Since a conventional VTC is driven hydraulically, the challenges are response speed and operation limit at low temperature. Our company has been developing an electric VTC for quick response and expansion of operating conditions. Currently, it is necessary to optimize the motor and reduction gear design to balance quicker response with downsizing. Therefore, a coupled simulator that can calculate electricity, mechanics, control, and thermo characteristics is required. In 1D simulation, a thermal network method is commonly used for thermal calculation. However, an electric VTC is attached to the end of a camshaft; therefore, determining thermal resistances is difficult. We propose a method of determining thermal resistances, using both theoretical and experimental approaches. Thermal resistances of convective heat transfer are calculated automatically by using the formula of the heat transfer coefficient while referring to the rotation speed of the electric VTC and engine. Thermal resistances of conduction are calculated based on heat conduction formula. Thermal resistances that cannot be calculated directly are determined through parameter identification by using test equipment that can measure the inner temperature of an electric VTC under driving conditions. The calculation and measured temperature were in agreement within less than 10°C under stable and transient conditions. This enables the coupled simulator to calculate the characteristics of an electric VTC including thermal behaviors.
Sector:
Topic:
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Select
Price
List
\$27.00
Mail
\$27.00
Members save up to 40% off list price.
Special Offer
Share
Page URL

### Related Items

Technical Paper / Journal Article
2010-10-19
Event
2017-10-10
Book
2004-03-13
Technical Paper / Journal Article
2010-10-25
Standard
2012-12-03
Article
2016-09-06
Training / Education
2014-04-14
Technical Paper / Journal Article
2010-10-25
Article
2016-09-06
Article
2016-09-20
Training / Education
2012-08-02
Training / Education
2017-11-01
Article
2016-08-24
Article
2016-08-25
Article
2017-01-11
Training / Education
2010-03-15
Technical Paper / Journal Article
2010-10-25
Technical Paper / Journal Article
2010-10-25
Standard
2016-05-10
Training / Education
2013-08-22
Training / Education
2010-03-15
Standard
2014-06-05
Standard
2013-05-03
Technical Paper / Journal Article
2010-10-19
Technical Paper / Journal Article
2010-10-25