US 12,215,646 B1
Abnormality diagnosis device for internal combustion engine
Akihiro Katayama, Toyota (JP); and Yoshifumi Matsuda, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Jun. 27, 2024, as Appl. No. 18/756,038.
Claims priority of application No. 2023-178316 (JP), filed on Oct. 16, 2023.
Int. Cl. F02D 41/22 (2006.01)
CPC F02D 41/222 (2013.01) [F02D 2041/223 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An abnormality diagnosis device for an internal combustion engine, the abnormality diagnosis device comprising:
a setting unit that is connected to an intake passage and that sets a reference value for pressure in the passage through which gas flows;
an accumulating unit for accumulating a difference between the reference value and the pressure, from a point in time of the pressure falling below the reference value, to obtain a cumulative value; and
a diagnosis unit for diagnosing an abnormality of the passage based on the cumulative value, wherein,
when no peak is present in the pressure, the setting unit sets the reference value based on a state of the internal combustion engine, and
when a peak is present in the pressure, the setting unit sets the peak as the reference value.