PATENT CLAIM ANALYSIS

Application Number: 15864312
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2018-05
Patent Classification: ["060", "276000"]

Abstract:
An internal combustion engine comprises an exhaust purification catalyst and an air-fuel ratio sensor arranged at a downstream side of the exhaust purification catalyst, stops or decreases a feed of fuel as fuel cut control, and controls an air-fuel ratio of exhaust gas to a rich air-fuel ratio after the end of the fuel cut control as post reset rich control. The diagnosis system calculates a first characteristic of change of air-fuel ratio at the time when the output air-fuel ratio first passes a first air-fuel ratio region leaner than a stoichiometric air-fuel ratio and a second characteristic of change of air-fuel ratio at the time when the output air-fuel ratio first passes a second air-fuel ratio region including a stoichiometric air-fuel ratio. The diagnosis system diagnoses the abnormality of the air-fuel ratio sensor based on the first characteristic of change of air-fuel ratio and the second characteristic of change of air-fuel ratio. As a result, it is possible to suppress the effects of the change of state of the exhaust purification catalyst while accurately diagnosing the abnormality of deterioration of response of a downstream side air-fuel ratio sensor.

Claim (Index 20):
A diagnosis system of an internal combustion engine comprising an exhaust purification catalyst arranged in an exhaust passage of the internal combustion engine and being able to store oxygen in inflowing exhaust gas and an air-fuel ratio sensor arranged at a downstream side of the exhaust purification catalyst in a direction of exhaust flow and detecting an air-fuel ratio of exhaust gas flowing out from the exhaust purification catalyst, stopping or decreasing a feed of fuel to a combustion chamber as fuel cut control, and controlling an air-fuel ratio of exhaust gas flowing into the exhaust purification catalyst after the end of the fuel cut control to a rich air-fuel ratio richer than a stoichiometric air-fuel ratio as post reset rich control,\n wherein the diagnosis system comprises a change characteristic calculating means for calculating a characteristic of change of air-fuel ratio when the output air-fuel ratio of the air-fuel ratio sensor first passes a part of an air-fuel ratio region of a stoichiometric air-fuel ratio or more, after the end of the fuel cut control, based on an output air-fuel ratio output from the air-fuel ratio sensor, a converged air-fuel ratio detecting means for detecting an output air-fuel ratio when a speed of change of output air-fuel ratio of the air-fuel ratio sensor becomes a reference speed or less after the end of the fuel cut control, as a converged output air-fuel ratio, based on an output air-fuel ratio output from the air-fuel ratio sensor, and an abnormality diagnosing means for diagnosing abnormality of the air-fuel ratio sensor base on the characteristic of change of air-fuel ratio calculated by the change characteristic calculating means and a converged output air-fuel ratio detected by the converged air-fuel ratio detecting means.

Metadata:
- Claim Count in Document: 17.0
- Percentile: 86.0
- Lexical Diversity: 2.72222
- Patent Class: 60.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['14900849', '14900792', '14900645', '14847674', '14496187']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7553238030756668
- 35 USC 102 Novelty (BERT): 0.5967201380721117
- Combined Prediction Score: 0.7394634365753113
- Mean Citation Score: 445.328088
- Max Citation Score: 516.9739400000002
- Similarity Product: 512.1545304425492

Labels:
- Claim Label 101: 0
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 0
- Label 101 Adjusted: 0

Dataset: test