PATENT CLAIM ANALYSIS

Application Number: 15887189
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-08
Patent Classification: ["204", "424000"]

Abstract:
A gas detection device includes a temperature control part configured to control an amount of energization to a heater so that an impedance of an element part matches a target impedance, to thereby control a temperature of the heater. The temperature control part is configured to set a first target impedance as the target impedance while performing application voltage control for air-fuel ratio detection, and set a second target impedance as the target impedance while performing application voltage control for SOx detection.

Claim (Index 1):
A gas detection device, comprising:\n an element part, which is provided in an exhaust passage of an internal combustion engine, said element part comprising an electrochemical cell comprising a solid electrolyte body having oxide ion conductivity and a first electrode and a second electrode formed on respective surface of said solid electrolyte body, and a diffusion resistance body made of a porous material through which exhaust gas flowing through said exhaust passage is allowed to pass, said element part being configured so that said exhaust gas flowing through said exhaust passage reaches said first electrode through said diffusion resistance body; an element impedance detection part configured to detect an impedance of said element part; a heating part configured to generate heat when a current is supplied, to thereby heat said element part; a temperature control part configured to control an amount of energization to said heating part based on said detected impedance of said element part, to thereby control a temperature of said element part; a voltage application part configured to apply a voltage between said first electrode and said second electrode; a current detection part configured to detect an output current, which is a current flowing between said first electrode and said second electrode; and a measurement control part configured to use said voltage application part to control an application voltage, which is said voltage applied between said first electrode and said second electrode, use said current detection part to acquire said output current, and perform one of determination of whether or not sulfur oxide having a concentration equal to or more than a predetermined concentration is contained in said exhaust gas and detection of said concentration of said sulfur oxide in said exhaust gas, wherein: said measurement control part is configured to:\n use said voltage application part to perform application voltage control for air-fuel ratio detection of setting said application voltage to a voltage that brings said output current to a limiting current of oxygen, to thereby detect said air-fuel ratio of mixture supplied to said internal combustion engine based on said output current acquired during a period in which said application voltage control for said air-fuel ratio detection is being performed; and \n use said voltage application part to perform application voltage control for SOx detection of performing at least one cycle of an application voltage sweep of: performing a voltage increase sweep of increasing said application voltage from a first voltage selected from a first voltage range more than a lower limit voltage in a region of said limiting current and less than a decomposition start voltage of said sulfur oxide to a second voltage selected from a second voltage range more than said decomposition start voltage of said sulfur oxide; and then performing a voltage decrease sweep of decreasing the application voltage from said second voltage to said first voltage, to thereby acquire, based on said output current, a parameter correlating with a degree of a change that is generated in said output current resulting from a current flowing between said first electrode and said second electrode due to a phenomenon that sulfur adsorbed to said first electrode returns to sulfur oxide through a reoxidation reaction on said first electrode when said application voltage becomes less than said decomposition start voltage of said sulfur oxide in a period of said voltage decrease sweep, and is generated in said output current that increases as said concentration of said sulfur oxide contained in said exhaust gas increases; and \n perform one of said determination of whether or not said sulfur oxide having a concentration equal to or more than said predetermined concentration is contained in said exhaust gas and said detection of said concentration of said sulfur oxide in said exhaust gas; and \n said temperature control part is configured to:\n control, when said application voltage control for said air-fuel ratio detection is being performed, said amount of energization so that said temperature of said element part matches a first temperature in accordance with a first temperature characteristic, which is a relationship between said impedance of said element part and said temperature of said element part in a case where said application voltage control for said air-fuel ratio detection is being performed; and \n control, when said application voltage control for said SOx detection is being performed, said amount of energization so that said temperature of said element part matches a second temperature, which is one of a temperature equal to said first temperature and a temperature different from said first temperature, in accordance with a second temperature characteristic, which is a relationship between said impedance of said element part and said temperature of said element part in a case where said application voltage control for said SOx detection is being performed.

Metadata:
- Claim Count in Document: 9.0
- Percentile: 88.0
- Lexical Diversity: 2.09756
- Patent Class: 204.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15841924', '15796240', '15841941', '14894848', '15082032']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8202701940215483
- 35 USC 102 Novelty (BERT): 0.5476189756524378
- Combined Prediction Score: 0.7930050721846372
- Mean Citation Score: 353.85681800000015
- Max Citation Score: 417.24445
- Similarity Product: 393.4232744996338

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

Dataset: test