US 7,353,102 B2 · Trouble diagnosis apparatus for supercharger of internal combustion engine

Abstract

An internal combustion engine includes parallel first and second intake passages, and the intake passages respectively include first and second superchargers. A first airflow meter measures the intake air amount in the first intake passage. A second airflow meter measures the intake air amount in the second intake passage. An ECU obtains an air amount difference between the intake air amount measured by the first airflow meter and the intake air amount measured by the second airflow meter to compare the obtained air amount difference with a predetermined abnormality determination value. The ECU determines that an abnormality has occurred in one of the superchargers when the air amount difference exceeds the abnormality determination value. The abnormality determination of the superchargers is based on the air amount difference between the intake passages. This accurately determines the occurrence of an abnormality in the superchargers regardless of structure of the intake passages.

Claims20

Dependent claims

A diagnostic apparatus for first and second superchargers of an internal combustion engine provided in parallel first and second intake passages, respectively, the diagnostic apparatus comprising:

a first measuring device for measuring intake air amount in the first intake passage at a portion downstream from the first supercharger;
a second measuring device for measuring intake air amount in the second intake passage at a portion downstream from the second supercharger;
an air amount difference computer for obtaining an air amount difference, which is the difference between the intake air amount measured by the first measuring device and the intake air amount measured by the second measuring device;
and
a determination unit for comparing the obtained air amount difference with a preset abnormality determination value and determining that an abnormality has occurred in either one of the first and second superchargers when the air amount difference exceeds the abnormality determination value.

2 more elements

A diagnostic apparatus for first and second superchargers of an internal combustion engine provided in first and second intake passages extending from first and second cylinder banks, respectively, the diagnostic apparatus comprising:

a first measuring device, arranged in the first intake passage at a portion downstream from the first supercharger, for measuring intake air amount of said portion;
a second measuring device, arranged in the second intake passage at a portion downstream from the second supercharger, for measuring intake air amount of said portion;
an air amount difference computer for obtaining an air amount difference, which is the difference between the intake air amount measured by the first measuring device and the intake air amount measured by the second measuring device;
a determination unit for determining whether or not the obtained air amount difference has exceeded an abnormality determination value prerecorded on a recording medium as a reference value for determining abnormality in the superchargers;
an abnormality warning unit for warning that an abnormality has occurred in one of the first and second superchargers when the air amount difference exceeds the abnormality determination value;
and
a controller for controlling the air amount difference computer, the determination unit, and the abnormality warning unit.

4 more elements

Dependencies are inferred from the claim text.

Trouble diagnosis apparatus for supercharger of internal combustion engine

Life of this patent

Trouble diagnosis apparatus for supercharger of internal combustion engine

Life of this patent

Abstract

Claims20