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US 7,568,375 B2Granted
Gas sensor, gas sensor system, and controlling method thereof
AssigneeHonda Motor Co., Ltd.
InventorsTakashi Sasaki, Akihiro Suzuki, Takashi Saito, Hidetoshi Oishi
Life of this patent
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Abstract
A gas sensor disposed on a wall of a gas passage, the gas sensor including: a gas detector detecting a target gas contained in the gas flowing in the gas passage; a detector which houses therein the gas detector and has a gas chamber into which the gas is introduced; and a cutoff valve controlling the introducing of the gas into the gas chamber from the gas passage.
Claims5
A gas sensor system comprising:
- a gas sensor disposed on a wall of a gas passage, the gas sensor comprising:
- a gas detector detecting a target gas contained in the gas flowing in the gas passage;
- a detector housing which houses therein the gas detector and has a gas chamber into which the gas is introduced;
- and
- a cutoff unit controlling the introduction of the gas into the gas chamber from the gas passage;
- and
- a controller controlling the motion of the cutoff unit, wherein the controller controls a cutoff valve to introduce the gas into the gas chamber from the gas passage only when measuring the target gas;
- wherein the gas passage is an off-gas line of a fuel cell, the target gas is hydrogen, and the detection of the target gas is performed during the power generation of the fuel cell.
5 more elements
A gas sensor system comprising:
- a gas sensor disposed on a wall of a gas passage, the gas sensor comprising:
- a gas detector detecting a target gas contained in the gas flowing in the gas passage;
- a detector housing which houses therein the gas detector and has a gas chamber into which the gas is introduced;
- a cutoff unit controlling the introduction of the gas into the gas chamber from the gas passage;
- and
- at least one protrusion which protrudes into the gas chamber from the wall of the gas chamber;
- and
- a controller controlling the cutoff unit, wherein the controller controls a cutoff valve to introduce the gas into the gas chamber from the gas passage only when measuring the target gas;
- wherein the gas passage is an off-gas line of the fuel cell, the target gas is hydrogen, and the detection of the target gas is performed during the power generation of the fuel cell.
6 more elements
A method for controlling a gas sensor system including a gas detector, a gas chamber, a cutoff valve, and a controller, the method comprising the steps of:
- controlling, by the controller, the cutoff valve to introduce the gas into the gas chamber from a gas passage;
- detecting, by the gas detector, a target gas contained in the gas introduced into the gas chamber, wherein
- the controller introduces the gas into the gas chamber from the gas passage only when measuring the target gas by controlling the cutoff valve;
- wherein the gas passage is an off-gas line of a fuel cell, the target gas is hydrogen, and the detection of the target gas is performed during the power generation of the fuel cell.
1 more element
A gas sensor system for detecting a target gas contained in air flowing through a gas passage, the gas sensor system comprising:
- a gas detector which detects a target gas;
- a detector housing in which the gas is introduced;
- a gas chamber which is disposed in the detector housing and houses therein the gas detector;
- an intrusion controller which is disposed at a connection hole between the detector housing and the gas chamber and which limits the intrusion of moisture contained in gas into the gas chamber;
- a cutoff unit which performs an opening and closing of a through hole between the gas passage and the detector housing;
- and
- a controller which controls the motion of the cutoff unit;
- wherein the cutoff unit includes:
- a valve for opening and closing the through hole,
- a spring member which pushes the valve in a direction closing the through hole, and closes the through hole with one end of the valve,
- a housing which houses therein the spring member and the other end of the valve, and
- a compressed air supply unit which supplies compressed air into the housing to move the valve in a direction opening the through hole by the compressed air.
9 more elements
A gas sensor system for detecting a target gas contained in air flowing through a gas passage, the gas sensor system comprising:
- a gas detector which detects a target gas;
- a detector housing in which the gas is introduced;
- a gas chamber which is disposed in the detector housing and houses therein the gas detector;
- an intrusion controller which is disposed at a connection hole between the detector housing and the gas chamber and which limits the intrusion of moisture contained in gas into the gas chamber;
- a cutoff unit which performs an opening and closing of a through hole between the gas passage and the detector housing;
- and
- a controller which controls the motion of the cutoff unit;
- wherein the gas passage is an off-gas line of a fuel cell, the target gas is hydrogen, and the detection of the target gas is performed during the power generation of the fuel cell.
5 more elements
Dependencies are inferred from the claim text.