Hydrogen detection system
A technology for a hydrogen detection system and a detection element, which is applied in the field of hydrogen detection systems, can solve problems such as the deterioration of detection sensitivity and the limit of the amount of silicon compound adhesion, and achieve the effect of restoring the sensitivity of hydrogen detection.
Inactive Publication Date: 2012-08-08
HONDA MOTOR CO LTD
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Problems solved by technology
[0007] However, in Patent Document 1, the silicon compound in the atmosphere is always attached to the silicon capture layer, so there is a limit to the amount of the silicon compound attached.
Therefore, although it is possible to prolong the time until the detection sensitivity deteriorates, the detection sensitivity still deteriorates eventually.
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Embodiment Construction
[0079] Below, refer to Figure 1 ~ Figure 13 , An embodiment of the present invention will be explained. "Structure of Fuel Cell Vehicles"
[0080] figure 1 The fuel cell vehicle 200 shown is equipped with a fuel cell system 100 including a PEFC (PolymeR ElectRolyte Fuel Cell) type fuel cell stack 110, a hydrogen tank 121 (hydrogen storage mechanism), and hydrogen sensors 10A to 10D. The fuel cell stack 110 The generated electric power is used to rotate a drive motor (not shown) to travel.
[0081] The fuel cell stack 110 is arranged in the center channel 201, and the hydrogen tank 121 is arranged in the tank chamber 202. The center tunnel 201 is an elongated space extending in the front-rear direction formed by swelling the center portion of the floor 203 in the vehicle width direction upward. The tank chamber 202 is a cylindrical space extending in the vehicle width direction formed by swelling the rear part of the bottom plate 203 corresponding to the outer shape of the hydrog...
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The present invention provides a hydrogen detection system for recovering a hydrogen detection sensitivity of a hydrogen sensor. The hydrogen detection system 1 comprises a hydrogen sensor 10A having a detection element 21 made of a catalytic metal which burns hydrogen so as to generate combustion heat, so as to detect a hydrogen concentration based on a detected value of the detection element, a heating unit can heat the detection element 21, a hydrogen storage unit 121 is included, and a hydrogen guiding pipe can guide the hydrogen from the hydrogen storage unit to the detection element; a cleaning valve 124 arranged on the hydrogen guiding pipe; a first dilution unit (D1) arranged between the cleaning valve 124 and the detection element 21 and used for diluting the hydrogen by using a cathode exhaust gas; and an ECU 150 which can control the hydrogen concentration from the first dilution unit (D1) towards the detection element 21, thus the temperature of the detection element 21 is raised to or above the desorption temperature of the adhered silicon compound by the combustion heat of the hydrogen.
Description
Technical field [0001] The present invention relates to a hydrogen detection system. Background technique [0002] In recent years, as a clean energy source, a fuel cell using hydrogen as a fuel gas has attracted attention, and the development of a fuel cell vehicle equipped with this fuel cell as an energy source for driving the vehicle is progressing. In addition, the fuel cell vehicle is equipped with a hydrogen sensor, and when hydrogen leaks, the hydrogen sensor is used to detect the leak. [0003] As the hydrogen sensor, a contact combustion type hydrogen sensor with simple structure and easy miniaturization is used. However, hydrogen sensors are known to have the following situation: when silicon compound vapor is present in the atmosphere of the use environment, the silicon compound will adhere to the detection element, and the detection sensitivity of the detection element will deteriorate over time (silicon (Si) poisoning) . [0004] Therefore, a technique of directly co...
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IPC IPC(8): G01N27/16
CPCG01N27/16
Inventor 塚林俊二大石英俊冈岛一博
Owner HONDA MOTOR CO LTD