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A Digital Electronic Shift Schedule Control for Vehicular Automatic Transmissions
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English
Abstract
A digital transmission shift schedule control has been developed which measures throttle position and vehicle speed to determine the proper gear ratio based on preprogrammed upshift and downshift schedules.
Transmission pleasability was evaluated for various degrees of resolution for these two primary input variables. Five- and six-bit vehicle speed and three- and four-bit throttle position resolutions were tested. Throttle position was measured with an experimental variable reluctance (variable frequency oscillator) device, located above the throttle pedal; vehicle speed was measured by a magnetic pickup from a toothed wheel on the transmission output shaft.
The electronic control system has been evaluated for over 4000 miles under city, highway, sea level and high altitude conditions.
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Authors
Citation
Casey, G., "A Digital Electronic Shift Schedule Control for Vehicular Automatic Transmissions," SAE Technical Paper 790044, 1979, https://doi.org/10.4271/790044.Also In
References
- Chana H.E. Fedewa W.L. Mahoney J.E. “An Analytical Study of Transmission Modifications as Related to Vehicle Performance and Economy,” SAE Paper No. 770418 SAE International Automotive Engineering Congress and Exposition Detroit, Michigan 28 February 4 March 1977
- Reddy J.N. “Sensors for Automotive Engine Control.” SAE Paper No. 770399 SAE International Engineering Congress and Exposition Detroit, Michigan 28 February 4 March 1977