Machine Vision System for Quantifying Engine Valve Deposits

Paper #:
  • 932807

Published:
  • 1993-10-01
Citation:
Hansen, A., Brooker, A., and Reid, J., "Machine Vision System for Quantifying Engine Valve Deposits," SAE Technical Paper 932807, 1993, https://doi.org/10.4271/932807.
Pages:
10
Abstract:
Inlet valve deposits in gasoline engines have a significant effect on engine operation with particular reference to cold starting and driveability. Present methods of quantifying these deposits by weighing them or rating them with the aid of a visual rating scale are recognized as not being reliable indices of the detrimental effect of these deposits. A valve deposit quantification system was developed that relied on the use of machine vision. Algorithms were formulated to track the silhouetted edge profile of a backlit valve from which a valve volume was determined. The valve deposit volume was calculated as the difference in volume between the valve in its clean and coked states. The system was able to detect a minimum coke deposit level of 0.06g at the 95% confidence limit, the accuracy being based on the correlation between the volume as determined by the vision system and the mass of the deposit.
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