Patent ID: 6880381
Filing Date: 2005-04-19
Classification: F02P,G01L,Y02T

Abstract:
1. A knock detection device comprising: cylinder pressure detecting means for detecting cylinder pressure in an internal combustion engine; threshold value computing means for computing a knock detection threshold value based on cylinder pressures for a plurality of cycles detected by said cylinder pressure detecting means; and knock occurrence determining means for determining the occurrence or non-occurrence of knock, based on said threshold value computed by said threshold value computing means, wherein said knock detection device further comprises: maximum cylinder pressure detecting means for detecting a maximum cylinder pressure in each cycle from said cylinder pressures detected by said cylinder pressure detecting means; maximum cylinder pressure fluctuation detecting means for detecting a maximum cylinder pressure fluctuation in each cycle from said cylinder pressures detected by said cylinder pressure detecting means; and heavy knock occurrence determining means for determining the occurrence or non-occurrence of heavy knock in a given cycle, based on said maximum cylinder pressure fluctuation detected by said maximum cylinder pressure fluctuation detecting means and said maximum cylinder pressure detected by said maximum cylinder pressure detecting means.