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A Steady State Vehicle Model to Predict Engine and Transmission Performance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1999 by SAE International in United States
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A steady state vehicle model is developed that will predict engine and automatic transmission operating conditions based on various vehicle configurations and operating conditions. The model provides a better understanding of the effects, including direction and magnitude, of changes in vehicle configuration and/or operating conditions on powertrain requirements. The model results can then be used as input into powertrain matching decisions. In general, the model will begin by determining vehicle road load requirements (wheel speed and torque) as a function of vehicle speed based on ambient, road, and vehicle inputs. Such road load requirement will then be cascaded into input and output requirements of the rear axle, transmission gearing, torque converter (locked and unlocked), and finally the engine. Wide open throttle engine torque data will also be translated into tractive effort at the wheels and resulting acceleration capability versus the vehicle road load requirements.
|Technical Paper||Powertrain Matching for Better Fuel Economy|
|Journal Article||Development of Innovative Toyota 10-Speed Longitudinal Automatic Transmission|
|Technical Paper||In-Situ Measurement of Holistic Powertrain Efficiency in Vehicles|
CitationJawad, B., Trimboli, B., and Ranspach, P., "A Steady State Vehicle Model to Predict Engine and Transmission Performance," SAE Technical Paper 1999-01-0742, 1999, https://doi.org/10.4271/1999-01-0742.
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