Application of Model-based Development to Engine Restart Vibration After Idling Stop

Paper #:
  • 2017-01-1053

Published:
  • 2017-03-28
Abstract:
Adoption of idling stop systems continues to increase even in non-hybrid vehicles with conventional engines in order to enhance fuel economy. Engine restart vibration occurs when returning from idling stop, so it is more frequent than the vibration that occurs during normal engine start-up, and engine restart vibration becomes more noticeable. Investigation is needed in the initial stages of vehicle development to predict the accurate level of engine restart vibration. This study presents a case of using the model-based development (MBD) process for engine restart vibration from the initial stages of development. 1. The new evaluation method of engine restart vibration: This uses the frequency weighting and the fouth power vibration dose values (VDV) prescribed by ISO 2631-1. They are applied by multiplying the seat vibration acceleration measured during restart. The obtained VDV in each direction are used as the engine restart vibration evaluation values. 2. CAE for predicting restart vibration, including prediction of in-cylinder pressure: This study attempted to establish CAE model for predicting engine restart vibration in order to determine the each parts characteristic at an early stage. And this study attempted to predict engine restart vibration by treating in-cylinder pressure as the theoretical prediction value from each engine control parameter. Application of the MBD process from the initial stages of development makes it possible to determine the power plant and car body characteristics, which are deeply related to engine restart vibration.
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