Throttle icing: Understanding the icing mechanism and effects of various throttle features

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Title: Throttle icing: Understanding the icing mechanism and effects of various throttle features
Author: Galante-Fox, Julie M.; Jarvis, Donald E.; Garrick, Robert D.; Chen, Alfred J.
Abstract: Some Electronic Throttle Control (ETC) Air Control Valves (ACV) on automotive internal combustion engines are susceptible to icing of the throttle valve. Ice formation can result in an increase in torque required to open or close the valve. Laboratory studies were conducted to improve the understanding of throttle valve icing on electronic throttle control valves with both aluminum and composite (plastic) bodies over various bore sizes (4 cylinder to 8 cylinder engines). Study results indicated that ice compression at the bore and valve gap, not ice adhesion, is the major contributor to the ETC-ACV icing phenomenon. In addition, testing of parts with various bore sizes, orientations and surface cleanliness resulted in further understanding of the icing issue.
Description: The following papers are published on this website with permission from SAE International. As a user of this website, you are permitted to view these papers on-line, download these .pdf files and print one copy of these papers at no cost for your use only. The downloaded .pdf files and printout of these SAE papers may not be copied, distributed or forwarded to others or for the use of others. SAE Paper # 2008-01-0439 © **2008 SAE International.
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Date: 2008

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