PATENT CLAIM ANALYSIS

Application Number: 15892851
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-08
Patent Classification: ["204", "408000"]

Abstract:
A gas detection device includes a temperature control part configured to detect an element impedance by applying a high frequency voltage to an element part, and to control an electric power to be supplied to a heating part based on the detected element impedance. The temperature control part is configured, when the applied voltage control for SOx detection is being performed and at least a voltage decrease sweep is being performed, to perform a second element temperature control to stop detecting the element impedance to set the electric power to be supplied to the heating part to a predetermined electric power.

Claim (Index 1):
A gas detection device, comprising:\n an element part, provided in an exhaust gas passage of an internal combustion engine, having an electrochemical cell including: a solid electrolyte body having oxide ion conductivity; 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 gas passage is allowed to pass, said element part being configured so that said exhaust gas flowing through said exhaust gas passage reaches said first electrode through said diffusion resistance body; 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; a measurement control part configured to use said voltage application part to control an applied 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, based on said acquired output current, a determination as to whether or not sulfur oxide having a concentration equal to or higher than a predetermined concentration is contained in said exhaust gas or a detection of a concentration of said sulfur oxide in said exhaust gas; an element impedance detection part configured to apply a high frequency voltage between said first electrode and said second electrode to thereby detect an impedance of said element part; a heating part configured to generate heat having a heat amount corresponding to an electric power supplied thereto to thereby heat said element part; and a temperature control part configured:\n to have said element impedance detection part perform or stop said detection of said impedance of said element part by applying said high frequency voltage; and \n to control said electric power supplied to said heating part to thereby control a temperature of said element part, \n wherein, said measurement control part is configured: to use said voltage application part to perform applied voltage control for air-fuel ratio detection by setting said applied voltage to a voltage that brings said output current to a limiting current of oxygen, to thereby detect an air-fuel ratio of mixture supplied to said internal combustion engine based on said output current acquired during a period in which said applied voltage control for said air-fuel ratio detection is being performed; to use said voltage application part to perform applied voltage control for SOx detection which includes an applied voltage sweep at least for one cycle, said applied voltage sweep including a voltage increase sweep and a voltage decrease sweep, wherein\n said voltage increase sweep increases said applied voltage from a first voltage to a second voltage, said first voltage is within a first voltage range higher than a lower limit voltage in a region of said limiting current and lower than a decomposition start voltage of said sulfur oxide, and said second voltage is within a second voltage range higher than said decomposition start voltage of said sulfur oxide, and \n said voltage decrease sweep decreases said applied voltage from said second voltage to said first voltage, \n to acquire, based on said output current, a parameter correlating with a degree of a change in said output current caused by a current flowing between said first electrode and said second electrode owing to a phenomenon that sulfur adsorbed to said first electrode returns to sulfur oxide through a reoxidation reaction on said first electrode when said applied voltage becomes lower than said decomposition start voltage of said sulfur oxide while said voltage decrease sweep is being performed, said change in said output current being larger as said concentration of said sulfur oxide contained in said exhaust gas being larger; and to perform, based on said acquired parameter, said determination or said detection; and said temperature control part is configured: to perform, while said applied voltage control for said air-fuel ratio detection is being performed, a first element temperature control to control said temperature of said element part by having said element impedance detection part detect said impedance of said element part through applying said high frequency voltage and by controlling said electric power supplied to said heating part in such a manner that said detected impedance of said element part comes close to a target impedance; and to have said element impedance detection part stop applying said high frequency voltage to stop detecting said element impedance, and perform a second element temperature control to set said electric power supplied to said heating part to a predetermined electric power, while said applied voltage control for said SOx detection is being performed and at least said voltage decrease sweep is being performed.

Metadata:
- Claim Count in Document: 9.0
- Percentile: 88.0
- Lexical Diversity: 2.12
- Patent Class: 204.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15887189', '15796240', '15841941', '15841924', '14894848']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8234142092608094
- 35 USC 102 Novelty (BERT): 0.573066976460727
- Combined Prediction Score: 0.7983794859808012
- Mean Citation Score: 382.04044000000016
- Max Citation Score: 470.1913
- Similarity Product: 454.3101536163687

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

Dataset: test