Browse Publications Technical Papers 2019-01-0349

Modeling and Validation of a Transmission E-Pump for Application in Hybrid Vehicles 2019-01-0349

The Electric Pump (E-Pump) is a critical component in the hybrid transmission system. The E-Pump provides flow to maintain a stable line pressure when the engine is in an off state. The main applications of the E-Pump are Park Pawl engagement and disengagement, engine start-stop operation and shadow shifting. A Systems Engineering Approach was followed to develop a medium fidelity plant model for the E-Pump. The developed model was initially tested and validated in the Model in-the loop (MIL) environment. After initial validation, the model was integrated into the overall vehicle model which was then tested on the Software in-the loop (SIL) and Hardware in-the loop (HIL) environments. The model was validated across different platforms and several operating conditions. The basic applications of the E-Pump such as park pawl actuation, engine starting and shadow shifting were validated. The model was later validated using the data, which was acquired on a prototype vehicle run on a dynamometer. The goal was to develop a common model, which could be used across different simulation platforms such as MIL, SIL and HIL. Development of the E-Pump model enabled early testing of critical requirements related to basic functionality of the system which otherwise would have be difficult to test. This in turn accelerated the software development process, which resulted in developing a mature and robust software even before the actual hardware was available. This paper describes the modeling and the verification and validation methods that was used for implementing the E-pump model across several platforms.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Efficient Power Electronic Inverter Control Developed in an Automotive Hardware-in-the-Loop Setup


View Details


Using High-Fidelity Multibody Vehicle Models in Real-Time Simulations


View Details


A Hardware-in-the-Loop (HIL) Bench Test of a GT-Power Fast Running Model for Rapid Control Prototyping (RCP) Verification


View Details