Transmission efficiency and component losses are imperative in the transmission development process. Initially, these efficiency and losses are used in analytical models to predict fuel economy and to assist in heat exchanger sizing. Then, when hardware components are available, physical testing is performed to verify the inputs to the initial models and to provide feedback to the analysis groups.
Today, General Motors will use either efficiency data or component loss data for Fuel Economy analysis and/or heat exchanger sizing. There are many differences between the two types of data sets. Therefore, a detailed test plan is required to further understand these differences between these two data sets and drive toward more accurate results.
Students who join this project team will determine the correlation between transmission efficiency and component losses and will provide feedback to the GM analysis community to improve modeling techniques and to the design community on high component losses.
Student Team Objectives
- Literature benchmarking of analysis techniques for transmission spin losses
- Measure total transmission loaded using a dynamometer [Transmission Efficiency]
- Measure the following component level losses using a dynamometer or component level test stand:
- By Major Subsystem
- By Subcomponent (Seals, Bearings, Etc…)
- Will utilize current test fixture capabilities for bench test
- Pump Loss
- Torque Converter Loss
- Correlate Efficiency vs Component level losses
- Provide feedback to modeling and design community