Abnormality diagnosis device for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsAkihiro Katayama, Yoshifumi Matsuda
Life of this patent
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Abstract
A setting unit which is connected to an intake passage and defines a reference value for a pressure in a passage through which gas flows, an accumulating unit which integrates a difference between the reference value and the pressure from a point in time when the pressure falls below the reference value and acquires an cumulative value, and a diagnosis unit which diagnoses an abnormality of the passage based on the cumulative value, wherein when there is no peak in the pressure, the setting unit sets the reference value based on a state of the internal combustion engine, and when there is a peak in the pressure, the setting unit sets the peak as the reference value in the abnormality diagnosis device.
Claims5
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.
Dependencies are inferred from the claim text.