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 22):
The abnormality diagnosis system of an internal combustion engine according to  claim 21  wherein\n the characteristic of change of air-fuel ratio is a change of speed of air-fuel ratio which is a change of speed when an output air-fuel ratio of the air-fuel ratio sensor first passes through the air-fuel ratio region, and \n the abnormality diagnosing means judges that the air-fuel ratio sensor is abnormal when a corrected change of speed of air-fuel ratio calculated by correcting the change of speed of air-fuel ratio is slower than a speed of change used as reference for abnormality, and judges that the air-fuel ratio sensor is normal when the corrected change of speed of air-fuel ratio is faster than a speed of change used as reference for abnormality.

Metadata:
- Claim Count in Document: 17.0
- Percentile: 86.0
- Lexical Diversity: 2.72222
- Patent Class: 60.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: False
- Related Applications: ['14900849', '14900792', '14900645', '14847674', '14496187']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7825769960761156
- 35 USC 102 Novelty (BERT): 0.5785550016128538
- Combined Prediction Score: 0.7621747966297895
- Mean Citation Score: 445.328088
- Max Citation Score: 516.9739400000002
- Similarity Product: 415.6343935397709

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