Energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor and alarm method

Abstract

The present invention relates to the field of hydrogen safety management technology, and provides an energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor and alarm method, including a vehicle signal input terminal, a primary alarm circuit and a secondary alarm circuit; the vehicle signal input terminal is electrically connected to the primary alarm circuit and the secondary alarm circuit respectively; when the hydrogen concentration at the detection position is greater than a first preset value and less than a second preset value, the primary alarm circuit activates a primary alarm, and when the hydrogen concentration at the detection position is greater than or equal to the second preset value, the secondary alarm circuit activates a secondary alarm. The present invention can be well applied to vehicle operation scenarios, and at the same time, when the hydrogen concentration is low, the energy consumption is basically 0, which well meets the static power consumption requirements of the whole vehicle, and can also realize the safety state detection of vehicle hydrogen safety under the premise of energy saving, and has the characteristics of simple structure, high reliability, strong stability, good energy-saving performance, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen safety management, and in particular to a hydrogen concentration alarm sensor and an alarm method for an energy-saving hydrogen fuel vehicle. Background Art

[0002] With the popularization of hydrogen fuel cell vehicles, hydrogen safety has received more and more attention. The existing hydrogen concentration sensors are not suitable for the vehicle architecture, resulting in high power consumption and limited application scenarios, making them not well suited for vehicle application scenarios. Summary of the invention

[0003] The present invention provides an energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor and an alarm method, aiming to solve the technical problems of high power consumption and poor applicability of traditional hydrogen concentration sensors.

[0004] In order to achieve the above object, the present invention provides an energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor, the energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor comprising: a vehicle signal input terminal, a primary alarm circuit and a secondary alarm circuit;

[0005] The vehicle signal input terminal is electrically connected to the primary alarm circuit and the secondary alarm circuit respectively;

[0006] When the hydrogen concentration at the detection position is greater than the first preset value and less than the second preset value, the first-level alarm circuit activates the first-level alarm. When the hydrogen concentration at the detection position is greater than or equal to the second preset value, the second-level alarm circuit activates the second-level alarm.

[0007] Preferably, the first-level alarm circuit comprises: a first voltage-dividing resistor, a second voltage-dividing resistor, a first hydrogen-sensitive tube, a first diode and a first-level alarm signal output terminal;

[0008] One end of the first voltage-dividing resistor is connected to the positive electrode of the vehicle signal input terminal, the other end of the first voltage-dividing resistor is connected to one end of the second voltage-dividing resistor, the other end of the second voltage-dividing resistor is respectively connected to the b pole and the c pole of the first hydrogen-sensitive tube, the e pole of the first hydrogen-sensitive tube is connected to the positive electrode of the first diode, and the negative electrode of the first diode is connected to the negative electrode of the vehicle signal input terminal.

[0009] Preferably, the secondary alarm circuit comprises: a third voltage-dividing resistor, a fourth voltage-dividing resistor, a second hydrogen-sensitive tube, a second diode and a secondary alarm signal output terminal;

[0010] One end of the third voltage-dividing resistor is connected to the positive electrode of the vehicle signal input terminal, the other end of the third voltage-dividing resistor is connected to one end of the fourth voltage-dividing resistor, the other end of the fourth voltage-dividing resistor is respectively connected to the b pole and the c pole of the second hydrogen-sensitive tube, the e pole of the second hydrogen-sensitive tube is connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the negative electrode of the vehicle signal input terminal.

[0011] Preferably, the positive collection pin and the negative collection pin of the first-level alarm signal output end are respectively connected to the other end of the second voltage-dividing resistor and the cathode of the first diode.

[0012] Preferably, the positive collection pin and the negative collection pin of the secondary alarm signal output end are respectively connected to the other end of the fourth voltage-dividing resistor and the cathode of the second diode.

[0013] Preferably, the first preset value is 2%, and the second preset value is 4%.

[0014] Preferably, the voltage of the vehicle signal input terminal is 12V.

[0015] In addition, in order to achieve the above purpose, based on the energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor, the present invention also provides an alarm method of the energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor, comprising the following steps:

[0016] Collect the level status of the positive collection pin of the first-level alarm output end and the positive collection pin of the second-level alarm output end:

[0017] (a) If the positive acquisition pin of the first-level alarm signal output end is at a high level, the hydrogen concentration at the detection position is less than the first preset value, that is, the hydrogen concentration is within a normal range;

[0018] (b) if the positive collection pin of the primary alarm signal output end is at a low level and the positive collection pin of the secondary alarm signal output end is at a high level, the hydrogen concentration at the detection position is greater than the first preset value and less than the second preset value, and the primary alarm circuit activates the primary alarm;

[0019] (c) If the positive acquisition pin of the secondary alarm signal output end is at a low level, the hydrogen concentration at the detection position is greater than or equal to the second preset value, and the secondary alarm circuit activates the secondary alarm.

[0020] The beneficial effects brought about by the technical solution provided by the present invention are as follows: the present invention provides an energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor and alarm method, including a two-stage alarm circuit, which can be well adapted to vehicle operation scenarios. At the same time, when the hydrogen concentration is low, the energy consumption is basically zero, which well meets the static power consumption requirements of the whole vehicle. Under the premise of energy saving, the safety status detection of vehicle hydrogen safety can also be realized. It has the characteristics of simple structure, high reliability, strong stability, good energy-saving performance, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a circuit diagram of a hydrogen concentration alarm sensor for an energy-saving hydrogen fuel vehicle of the present invention;

[0022] Figure 2 This is a flow chart of an alarm method of a hydrogen concentration alarm sensor for an energy-saving hydrogen fuel vehicle of the present invention;

[0023] In the figure: 1-positive electrode of vehicle power input signal, 2-negative electrode of vehicle power input signal, 3-first voltage-dividing resistor, 4-second voltage-dividing resistor, 5-first hydrogen-sensitive tube, 6-first diode, 7-third voltage-dividing resistor, 8-fourth voltage-dividing resistor, 9-second hydrogen-sensitive tube, 10-second diode, 11-positive collection pin of the signal output end of the first-level alarm circuit, 12-positive collection pin of the signal output end of the second-level alarm circuit, 13-negative collection pin of the signal output end of the first and second-level alarm circuits. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0025] Please refer to Figure 1 , Figure 1 It is a circuit diagram of a hydrogen concentration alarm sensor for an energy-saving hydrogen fuel vehicle of the present invention;

[0026] An energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor provided by the present invention comprises: a vehicle signal input terminal, a primary alarm circuit and a secondary alarm circuit;

[0027] The vehicle signal input terminal is electrically connected to the primary alarm circuit and the secondary alarm circuit respectively;

[0028] When the hydrogen concentration at the detection position is greater than the first preset value and less than the second preset value, the first-level alarm circuit activates the first-level alarm. When the hydrogen concentration at the detection position is greater than or equal to the second preset value, the second-level alarm circuit activates the second-level alarm.

[0029] In this embodiment, the first-level alarm circuit includes: a first voltage-dividing resistor 3, a second voltage-dividing resistor 4, a first hydrogen-sensitive tube 5, a first diode 6 and a first-level alarm signal output terminal;

[0030] One end of the first voltage-dividing resistor 3 is connected to the positive electrode 1 of the vehicle signal input terminal, the other end of the first voltage-dividing resistor 3 is connected to one end of the second voltage-dividing resistor 4, the other end of the second voltage-dividing resistor 4 is respectively connected to the b pole and the c pole of the first hydrogen-sensitive tube 5, the e pole of the first hydrogen-sensitive tube 5 is connected to the positive electrode of the first diode 6, and the negative electrode of the first diode 6 is connected to the negative electrode 2 of the vehicle signal input terminal.

[0031] In this embodiment, the secondary alarm circuit includes: a third voltage-dividing resistor 7, a fourth voltage-dividing resistor 8, a second hydrogen-sensitive tube 9, a second diode 10 and a secondary alarm signal output terminal;

[0032] One end of the third voltage-dividing resistor 7 is connected to the positive electrode 1 of the vehicle signal input terminal, the other end of the third voltage-dividing resistor 7 is connected to one end of the fourth voltage-dividing resistor 8, the other end of the fourth voltage-dividing resistor 8 is respectively connected to the b pole and the c pole of the second hydrogen-sensitive tube 9, the e pole of the second hydrogen-sensitive tube 9 is connected to the positive electrode of the second diode 10, and the negative electrode of the second diode 10 is connected to the negative electrode 2 of the vehicle signal input terminal.

[0033] In this embodiment, the positive collection pin 11 and the negative collection pin 13 of the first-level alarm signal output end are connected to the other end of the second voltage-dividing resistor 4 and the cathode of the first diode 5 respectively.

[0034] In this embodiment, the positive collection pin 12 and the negative collection pin 13 of the secondary alarm signal output end are connected to the other end of the fourth voltage-dividing resistor 8 and the cathode of the second diode 9 respectively.

[0035] As an optional implementation, the first preset value is 2%, the second preset value is 4%, and the specific parameter values ​​can be adjusted according to actual conditions.

[0036] As an optional implementation, the voltage of the vehicle signal input terminal is 12V.

[0037] The working principle of the hydrogen concentration alarm sensor for energy-saving hydrogen fuel vehicle in this embodiment is as follows:

[0038] When the hydrogen concentration at the collection position is lower than the first preset value (2%), due to the high impedance of the first hydrogen sensitive tube 5, the current of the first-level alarm circuit loop is lower than the conduction current of the first diode 6, and the first diode 6 is in a cut-off state. At this time, the output level of the positive collection pin 11 at the output end of the first-level alarm signal is IN+, which is in a high level state; when the hydrogen concentration at the collection position slowly increases to higher than the first preset value (2%), the impedance of the first hydrogen sensitive tube 5 slowly decreases, causing the current of the first-level alarm circuit loop to be greater than or equal to the conduction current of the first diode 6, and the first diode 6 is in a conducting state. At this time, a The output level of the positive acquisition pin 11 at the output end of the first alarm signal is the conduction voltage of the first diode 6 plus the divided voltage of the first hydrogen sensitive tube 5. Since the impedance of the first hydrogen sensitive tube 5 is very small, the output level of the positive acquisition pin 11 at the output end of the first alarm signal is relatively low and is in a low level state. In this way, the positive acquisition pin 11 at the output end of the first alarm signal is in a high and low level state, thereby obtaining whether the hydrogen concentration information around the sensor exceeds the first preset value, and the relevant alarm information can be obtained through the output end of the positive acquisition pin 11 at the output end of the first alarm signal, thereby realizing a first-level alarm.

[0039] When the concentration is lower than the first preset value (2%), since the first diode 6 is in the cut-off state, there is basically no current in the first-level alarm circuit loop, and the power consumption is basically 0, thereby achieving the purpose of low power consumption;

[0040] Similarly, when the hydrogen concentration at the collection position is lower than the second preset value (4%), due to the high impedance of the second hydrogen sensitive tube 9, the current of the secondary alarm circuit loop is lower than the conduction current of the second diode 10, and the second diode 10 is in a cut-off state. At this time, the output level of the positive collection pin 12 at the secondary alarm signal output end is IN+, which is in a high level state; when the hydrogen concentration at the collection position slowly increases to be greater than or equal to the second preset value (4%), the impedance of the second hydrogen sensitive tube 9 slowly decreases, causing the current of the secondary alarm circuit loop to be greater than or equal to the conduction current of the second diode, and the second diode 10 is in a conducting state. At this time, The output level of the positive collection pin 12 at the secondary alarm signal output end is the conduction voltage of the second diode 10 plus the divided voltage of the second hydrogen sensitive tube 9. Since the impedance of the second hydrogen sensitive tube 9 is very small, the output level of the positive collection pin 12 at the secondary alarm signal output end is relatively low at this time and is in a low level state; in this way, the high and low level states of the positive collection pin 12 at the secondary alarm signal output end can be realized, so as to obtain whether the hydrogen concentration information around the sensor exceeds the second preset value (4%), and the relevant alarm information can be obtained through the output port of the positive collection pin 12 at the secondary alarm signal output end, thereby realizing the secondary alarm.

[0041] Please refer to Figure 2In this embodiment, based on the above energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor, an alarm method is also provided, including the following steps:

[0042] Get the level status of the positive acquisition pin 11 of the first-level alarm output terminal and the positive acquisition pin 12 of the second-level alarm output terminal:

[0043] (a) If the positive acquisition pin 11 of the first-level alarm signal output end is at a high level, the hydrogen concentration at the detection position is less than the first preset value, that is, the hydrogen concentration is within a normal range;

[0044] (b) If the positive collection pin 11 of the first-level alarm signal output end is at a low level, and the positive collection pin 12 of the second-level alarm signal output end is at a high level, the hydrogen concentration at the detection position is greater than the first preset value and less than the second preset value, and the first-level alarm circuit activates the first-level alarm;

[0045] (c) If the positive collecting pin 12 of the secondary alarm signal output end is at a low level, the hydrogen concentration at the detection position is greater than or equal to the second preset value, and the secondary alarm circuit activates the secondary alarm.

[0046] The present invention provides an energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor and an alarm method, which are specially designed for the hydrogen safety of the vehicle and provide a two-stage alarm circuit. The hydrogen concentration detection accuracy is high and it can be well adapted to the vehicle operation scenario. At the same time, when the hydrogen concentration is low, the energy consumption is basically zero, which well meets the static power consumption requirement of the whole vehicle. Under the premise of energy saving, the safety state detection of the vehicle hydrogen safety can also be realized. The sensor has the characteristics of simple structure, high reliability, strong stability, good energy-saving performance, etc.

[0047] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0048] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor, characterized in that: The energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor comprises: a vehicle signal input terminal, a primary alarm circuit and a secondary alarm circuit; the vehicle signal input terminal is electrically connected to the primary alarm circuit and the secondary alarm circuit respectively; when the hydrogen concentration at the detection position is greater than a first preset value and less than a second preset value, the primary alarm circuit activates a primary alarm, and when the hydrogen concentration at the detection position is greater than or equal to the second preset value, the secondary alarm circuit activates a secondary alarm; The first-level alarm circuit comprises: a first voltage-dividing resistor (3), a second voltage-dividing resistor (4), a first hydrogen-sensitive tube (5), a first diode (6) and a first-level alarm signal output terminal; one end of the first voltage-dividing resistor (3) is connected to the positive electrode (1) of the vehicle signal input terminal, the other end of the first voltage-dividing resistor (3) is connected to one end of the second voltage-dividing resistor (4), the other end of the second voltage-dividing resistor (4) is respectively connected to the b pole and the c pole of the first hydrogen-sensitive tube (5), the e pole of the first hydrogen-sensitive tube (5) is connected to the positive electrode of the first diode (6), and the negative electrode of the first diode (6) is connected to the negative electrode (2) of the vehicle signal input terminal; the positive acquisition pin (11) of the first-level alarm signal output terminal is connected to the other end of the second voltage-dividing resistor, and the negative acquisition pin (13) of the first-level alarm signal output terminal is connected to the negative electrode of the first diode (6); The secondary alarm circuit comprises: a third voltage-dividing resistor (7), a fourth voltage-dividing resistor (8), a second hydrogen-sensitive tube (9), a second diode (10) and a secondary alarm signal output terminal; one end of the third voltage-dividing resistor (7) is connected to the positive electrode (1) of the vehicle signal input terminal, the other end of the third voltage-dividing resistor (7) is connected to one end of the fourth voltage-dividing resistor (8), the other end of the fourth voltage-dividing resistor (8) is respectively connected to the b pole and the c pole of the second hydrogen-sensitive tube (9), the e pole of the second hydrogen-sensitive tube (9) is connected to the positive electrode of the second diode (10), and the negative electrode of the second diode (10) is connected to the negative electrode (2) of the vehicle signal input terminal; the positive acquisition pin (12) of the secondary alarm signal output terminal is connected to the other end of the fourth voltage-dividing resistor (8), and the negative acquisition pin (13) of the secondary alarm signal output terminal is connected to the negative electrode of the second diode (10).

2. The energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor as claimed in claim 1, characterized in that: The first preset value is 2%, and the second preset value is 4%.

3. The energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor as claimed in claim 1, characterized in that: The voltage of the vehicle signal input terminal is 12V.

4. An alarm method for an energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor, applied to the energy-saving hydrogen fuel vehicle hydrogen concentration alarm sensor according to any one of claims 1 to 3; characterized in that: The alarm method comprises the following steps: collecting the level states of the positive collection pin (11) of the first-level alarm output end and the positive collection pin (12) of the second-level alarm output end: (a) if the positive collection pin (11) of the first-level alarm signal output end is at a high level, the hydrogen concentration at the detection position is less than a first preset value, that is, the hydrogen concentration is within a normal range; (b) if the positive collection pin (11) of the first-level alarm signal output end is at a low level and the positive collection pin (12) of the second-level alarm signal output end is at a high level, the hydrogen concentration at the detection position is greater than the first preset value and less than the second preset value, and the first-level alarm circuit starts the first-level alarm; (c) if the positive collection pin (12) of the second-level alarm signal output end is at a low level, the hydrogen concentration at the detection position is greater than or equal to the second preset value, and the second-level alarm circuit starts the second-level alarm.

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