A Stochastic Knock Control Algorithm

2009-01-1017

04/20/2009

Event
SAE World Congress & Exhibition
Authors Abstract
Content
In this paper a new knock control algorithm is developed based on a stochastic interpretation of the knock signal and on a control objective specified as a certain percentage of knocking cycles. Unlike previous ‘stochastic’ knock controllers, the new algorithm does not average or low pass filter the knock intensity signal and the transient response of the controller is consequently much faster. The performance of the new controller is compared in detail with the response of a traditional deterministic controller using a simple but effective knock simulation tool. The results show that the new controller is able to operate at a more advanced mean spark angle and that there is much less cyclic variance about this mean. The transient response to excess knocking events is as fast, or faster, than the conventional controller, though the rate of recovery from overly retarded conditions is slower. These results suggest that the new controller will deliver increased torque and engine efficiency under knock limited conditions.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-1017
Pages
10
Citation
Peyton Jones, J., Muske, K., Frey, J., and Scholl, D., "A Stochastic Knock Control Algorithm," SAE Technical Paper 2009-01-1017, 2009, https://doi.org/10.4271/2009-01-1017.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-1017
Content Type
Technical Paper
Language
English