US 6,981,487 B2
Knocking determination apparatus for internal combustion engine
Motoki Ohtani, Toyota (Japan)
Assigned to Toyota Jidosha Kabushiki Kaisha, Toyota (Japan)
Filed on Nov. 08, 2004, as Appl. No. 10/982,854.
Claims priority of application No. 2003-382842 (JP), filed on Nov. 12, 2003.
Prior Publication US 2005/0098156 A1, May 12, 2005
Int. Cl. F02P 5/00 (2006.01)
U.S. Cl. 123—406.37 18 Claims
OG exemplary drawing
 
1. An apparatus for determining whether or not knocking has occurred in an internal combustion engine, the internal combustion engine including a first injector for directly injecting fuel into a combustion chamber, a second injector for injecting fuel into an intake system, and a knock sensor for detecting information relating to knocking and generating an output signal, the apparatus comprising:
a knocking determination means for determining whether or not knocking has occurred based on the output signal of the knock sensor during a knock determination period; and
an altering means for altering the knock determination period in accordance with a ratio between the amount of fuel the first injector injects and the amount of fuel the second injector injects.