CN114878084B - Hydrogen leakage detection method for hydrogen energy vehicle - Google Patents

Abstract

The invention belongs to the technical field of hydrogen energy vehicles, and discloses a hydrogen leakage detection method for a hydrogen energy vehicle, which comprises the following steps: s1: detecting the concentration of hydrogen; s2: judging whether the concentration of the hydrogen reaches a first hydrogen concentration limit value or not; if yes, performing S3; if not, S4 is carried out; s3: judging whether the duration of the concentration of the hydrogen reaching the first hydrogen concentration limit value reaches a first time or not; if yes, S6 is carried out; if not, S4 is carried out; s4: calculating the accumulated hydrogen concentration in the second time; s5: judging whether the accumulated hydrogen concentration in the second time reaches a second hydrogen concentration limit value or not; if yes, S6 is carried out; if not, no processing is carried out; s6: and reporting the hydrogen leakage fault. The detection result of the hydrogen leakage detection method for the hydrogen energy vehicle is more accurate, the hydrogen leakage can be detected in time, and the safety performance of the vehicle is improved.

Description

A hydrogen leak detection method for a hydrogen energy vehicle

technical field

The invention relates to the technical field of hydrogen energy vehicles, in particular to a method for detecting hydrogen leakage of hydrogen energy vehicles.

Background technique

A hydrogen energy vehicle is a vehicle powered by a hydrogen fuel cell, which is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. Vehicles using hydrogen fuel cells have the characteristics of zero emissions, high efficiency, low noise, and fast energy replenishment. Hydrogen fuel cells are considered to be ideal vehicle power devices to replace traditional internal combustion engines. The detection of hydrogen leakage is the key to ensure the safe operation of hydrogen energy vehicles.

In the prior art, there are generally two methods for detecting whether hydrogen gas leaks. One is to judge whether there is hydrogen gas leakage by comparing the change of hydrogen gas quality with the hydrogen gas consumption rate. Errors are prone to misjudgment. The other is to install a hydrogen concentration sensor at a fixed position to monitor the concentration of hydrogen. When the concentration of hydrogen is detected to exceed the set limit and maintain for a period of time, the hydrogen concentration sensor will send out an alarm. However, due to the strong diffusion ability and good escape of hydrogen gas, and the hydrogen concentration sensor is installed in an open space, when hydrogen gas leaks, the hydrogen gas is easily affected by environmental factors when it diffuses, resulting in the concentration of hydrogen gas being unable to maintain or continue to rise. As a result, the detection results are not accurate enough. When a hydrogen leakage problem occurs in the vehicle, it may not be detected in time, and there is a safety risk.

Contents of the invention

The purpose of the present invention is to provide a method for detecting hydrogen gas leakage of a hydrogen energy vehicle, so as to solve the problem of inaccurate detection results of the method for detecting whether hydrogen gas leaks in the prior art.

For reaching this purpose, the present invention adopts following technical scheme:

A hydrogen energy vehicle hydrogen leakage detection method, comprising:

S1: Detect the concentration of hydrogen;

S2: judging whether the concentration of the hydrogen reaches the first hydrogen concentration limit;

If yes, proceed to S3;

If not, go to S4;

S3: judging whether the duration for which the hydrogen concentration reaches the first hydrogen concentration limit reaches a first time;

If yes, proceed to S6;

If not, go to S4;

S4: Calculate the accumulated hydrogen concentration within the second time;

S5: judging whether the accumulated hydrogen concentration within the second time reaches a second hydrogen concentration limit;

If yes, proceed to S6;

If not, do not process;

S6: Report a hydrogen leakage fault.

As a preferred solution of the above hydrogen energy vehicle hydrogen leakage detection method, the calculation of the cumulative hydrogen concentration within the second time in S4 includes:

By integrating the hydrogen concentration within the second time, the cumulative hydrogen concentration within the second time is calculated.

As a preferred solution of the above hydrogen energy vehicle hydrogen leakage detection method, the detection of hydrogen concentration in S1 includes:

The hydrogen concentration is detected by the hydrogen concentration sensor.

As a preferred solution of the above hydrogen energy vehicle hydrogen leakage detection method, the first time and the second time are set according to the installation position of the hydrogen concentration sensor and the distance between the hydrogen concentration sensor and the hydrogen leakage position. time.

As a preferred solution of the hydrogen gas leakage detection method for a hydrogen energy vehicle, the first hydrogen concentration limit is equal to the product of the first set hydrogen concentration and the first hydrogen concentration correction coefficient.

As a preferred solution of the hydrogen leakage detection method for a hydrogen energy vehicle, the first hydrogen concentration correction coefficient is obtained from the first hydrogen concentration correction coefficient-vehicle speed relationship table according to the vehicle speed.

As a preferred solution of the hydrogen energy vehicle hydrogen leakage detection method described above, the first set hydrogen concentration is set according to the installation position of the hydrogen concentration sensor and the distance between the hydrogen concentration sensor and a hydrogen leakage position.

As a preferred solution of the above-mentioned method for detecting hydrogen gas leakage of a hydrogen energy vehicle, the second hydrogen gas concentration limit is equal to the product of the second set hydrogen gas concentration and the second hydrogen gas concentration correction coefficient.

As a preferred solution of the hydrogen leakage detection method for a hydrogen energy vehicle, the second hydrogen concentration correction coefficient is obtained from the second hydrogen concentration correction coefficient-vehicle speed relationship table according to the vehicle speed.

As a preferred solution of the above hydrogen energy vehicle hydrogen leakage detection method, the second set hydrogen concentration is set according to the installation position of the hydrogen concentration sensor and the distance between the hydrogen concentration sensor and the hydrogen leakage position.

Beneficial effects of the present invention:

The object of the present invention is to provide a method for detecting hydrogen gas leakage of a hydrogen energy vehicle. The method for detecting hydrogen gas leakage of a hydrogen energy vehicle judges whether the concentration of hydrogen reaches the first hydrogen concentration limit, and if so, judges that the concentration of hydrogen reaches the first hydrogen concentration. Whether the duration of the concentration limit reaches the first time, if it is also reached, report the hydrogen leakage fault. When the concentration of hydrogen does not reach the first hydrogen concentration limit or the concentration of hydrogen reaches the first hydrogen concentration limit but the duration does not reach the first time, it is judged whether the accumulated hydrogen concentration reaches the second hydrogen concentration within the second consecutive time If the concentration limit is reached, a hydrogen leakage fault will also be reported. The method for detecting hydrogen gas leakage of a hydrogen energy vehicle can be used when hydrogen gas leakage occurs, but due to the influence of environmental factors during the diffusion of hydrogen gas, the concentration of hydrogen gas does not reach the first hydrogen gas concentration limit or the duration of reaching the first hydrogen gas concentration limit When hydrogen leakage is not detected within the first time, the hydrogen leakage can be detected in time by judging that the accumulated hydrogen concentration in the second time has reached the second hydrogen concentration limit, so that the detection result is more accurate and timely Detect hydrogen leakage and improve vehicle safety performance.

Description of drawings

Fig. 1 is a flow chart of a method for detecting hydrogen gas leakage of a hydrogen energy vehicle provided by a specific embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the orientation or positional relationship of the terms "up", "down", and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or It should not be construed as limiting the invention by implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation. In addition, the terms "first" and "second" are only used for distinction in description, and have no special meaning.

The present invention provides a method for detecting hydrogen gas leakage of a hydrogen energy vehicle, as shown in Figure 1, the method for detecting hydrogen gas leakage of a hydrogen energy vehicle includes:

S1: Detect the concentration of hydrogen.

The concentration of hydrogen is detected by the hydrogen concentration sensor installed on the hydrogen energy vehicle.

Hydrogen concentration sensors are installed above the bottle mouth valve of the hydrogen bottle on the hydrogen energy vehicle, above the fuel cell engine and inside the passenger compartment. It can be understood that, according to actual needs, the hydrogen concentration sensor can also be arranged at other positions.

S2: judging whether the hydrogen concentration reaches the first hydrogen concentration limit; if yes, proceed to S3; if not, proceed to S4.

Wherein, the first hydrogen concentration limit is equal to the product of the first set hydrogen concentration and the first hydrogen concentration correction coefficient.

The first set hydrogen concentration is set according to the installation position of the hydrogen concentration sensor and the distance between the hydrogen concentration sensor and the hydrogen leakage position. According to the experience of the staff, the relationship between the installation position of the hydrogen concentration sensor and the distance between the hydrogen concentration sensor and the hydrogen leakage position and the first set hydrogen concentration is obtained. It can be understood that the position prone to hydrogen leakage is the position on the vehicle where hydrogen gas leakage is likely to occur.

According to the driving speed of the vehicle, the first hydrogen concentration correction coefficient is obtained through the first hydrogen concentration correction coefficient-vehicle speed relationship table.

The first hydrogen concentration correction parameter is negatively correlated with the vehicle speed, and the first hydrogen concentration correction coefficient-vehicle speed relationship table is obtained through experiments. The specific test process is: simulate a hydrogen leak at one place of the vehicle, keep the leaked hydrogen concentration at the first initial concentration value p ₁ , drive at a fixed speed and record the first actual concentration detected by the hydrogen concentration sensor at this speed , calculate the average value q ₁ of the first actual hydrogen concentration during the entire vehicle running process, and divide the average value q ₁ of the first actual concentration by the first initial concentration value p ₁ to obtain the first hydrogen concentration correction coefficient corresponding to the vehicle speed. The vehicle is driven at different speeds to test the average value q ₁ of the first actual concentration corresponding to different speeds to obtain the first hydrogen concentration correction coefficients corresponding to different speeds, thereby obtaining the first hydrogen concentration correction coefficient-vehicle speed relationship table. Among them, considering the influence of different driving directions, the vehicle driving route is given priority to the circular route during the test.

During the actual driving process of the vehicle, the VCU obtains the first hydrogen concentration correction coefficient by looking up the first hydrogen concentration correction coefficient-vehicle speed relationship table according to the vehicle speed during the driving process. Therefore, the first hydrogen concentration correction coefficient is a variable value related to the vehicle speed, and in this case the hydrogen leakage fault can be judged more accurately.

S3: Determine whether the duration of the hydrogen concentration reaching the first hydrogen concentration limit reaches the first time; if yes, go to S6; if not, go to S4.

Wherein, the first time is set according to the installation position of the hydrogen gas concentration sensor and the distance between the hydrogen gas concentration sensor and the hydrogen leakage position. According to the experience of the staff, the relationship between the installation position of the hydrogen concentration sensor and the distance between the hydrogen concentration sensor and the hydrogen leakage position and the first time is obtained.

S4: Calculate the cumulative hydrogen concentration within the second time period.

Wherein, by integrating the hydrogen concentration detected by the hydrogen concentration sensor within the second time, the accumulated hydrogen concentration within the second time is calculated, that is, the accumulated hydrogen concentration within the second continuous time is calculated.

Set the second time according to the installation position of the hydrogen concentration sensor and the distance between the hydrogen concentration sensor and the hydrogen leakage position. The relationship between the installation position of the hydrogen concentration sensor and the distance between the hydrogen concentration sensor and the hydrogen leakage position and the second time is obtained according to the experience of the staff.

S5: Judging whether the accumulated hydrogen concentration within the second time reaches the second hydrogen concentration limit; if yes, go to S6.

Wherein, the second hydrogen concentration limit is equal to the product of the second set hydrogen concentration and the second hydrogen concentration correction coefficient. According to the driving speed of the vehicle, the second hydrogen concentration correction coefficient is obtained through the second hydrogen concentration correction coefficient-vehicle speed relationship table.

The second hydrogen concentration correction coefficient-vehicle speed relationship table is obtained through experimental testing. The specific test process is: simulate a hydrogen leak at one place of the vehicle, keep the concentration of the leaked hydrogen at the second initial concentration value p ₂ , drive on a circular route at a fixed speed and record the hydrogen concentration detected by the hydrogen concentration sensor at this speed For the second actual concentration, the two conditions of the vehicle traveling on the circular route for at least three laps and the driving time of the vehicle for at least the second time must be met during the test. Preferably, the travel time is N times the second time. Randomly select a time period of the second time, and calculate the second actual concentration q ₂ accumulated in the second time. The second hydrogen concentration correction coefficient corresponding to the vehicle speed is obtained by dividing the second actual concentration q2 accumulated in the _second time by the second initial concentration value _p2 . The vehicle is driven at different speeds to test the second actual concentration q ₂ accumulated in the second time corresponding to different speeds to obtain the second hydrogen concentration correction coefficient corresponding to different speeds, thereby obtaining the second hydrogen concentration correction coefficient-vehicle speed Relational tables.

The second set hydrogen concentration is set according to the installation position of the hydrogen concentration sensor and the distance between the hydrogen concentration sensor and the hydrogen leakage position. According to the experience of the staff, the relationship between the installation position of the hydrogen concentration sensor and the distance between the hydrogen concentration sensor and the hydrogen leakage position and the second set hydrogen concentration is obtained.

If the accumulated hydrogen concentration within the second time period does not reach the second hydrogen concentration limit, no processing is performed. At this time, it is considered that the vehicle has not leaked hydrogen, so no treatment is performed.

S6: Report a hydrogen leakage fault.

Optionally, when a hydrogen leak is detected, a fault alarm is issued while reporting a hydrogen leak fault.

The method for detecting hydrogen gas leakage of a hydrogen energy vehicle can be used when hydrogen gas leakage occurs, but due to the influence of environmental factors during the diffusion of hydrogen gas, the concentration of hydrogen gas does not reach the first hydrogen gas concentration limit or the duration of reaching the first hydrogen gas concentration limit When hydrogen leakage is not detected within the first time, the hydrogen leakage can be detected in time by judging that the accumulated hydrogen concentration in the second time has reached the second hydrogen concentration limit, so that the detection result is more accurate and timely Detect hydrogen leakage and improve vehicle safety performance.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. Various obvious changes, readjustments, and substitutions will occur to those skilled in the art without departing from the scope of the present invention. It is not necessary and impossible to exhaustively list all the implementation manners here. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (7)

1. A hydrogen leakage detection method for a hydrogen energy vehicle, comprising:

s1: detecting the concentration of hydrogen;

s2: judging whether the concentration of the hydrogen reaches a first hydrogen concentration limit value or not;

if yes, performing S3;

if not, S4 is carried out;

s3: judging whether the duration of the hydrogen concentration reaching the first hydrogen concentration limit value reaches a first time or not;

if yes, S6 is carried out;

if not, S4 is carried out;

s4: calculating the accumulated hydrogen concentration in the second time;

s5: judging whether the accumulated hydrogen concentration in the second time reaches a second hydrogen concentration limit value or not;

if yes, S6 is carried out;

if not, no processing is carried out;

s6: reporting a hydrogen leakage fault;

wherein, detecting the concentration of hydrogen in S1 comprises: detecting the concentration of hydrogen by a hydrogen concentration sensor;

wherein the first hydrogen concentration limit is equal to the product of a first set hydrogen concentration and a first hydrogen concentration correction coefficient;

obtaining a first hydrogen concentration correction coefficient through a first hydrogen concentration correction coefficient-vehicle speed relation table according to the vehicle running speed; the first hydrogen concentration correction coefficient is inversely related to the vehicle running speed.

2. The hydrogen leakage detection method for a hydrogen energy-source vehicle according to claim 1, wherein calculating the accumulated hydrogen concentration over the second time in S4 includes:

and calculating the accumulated hydrogen concentration in the second time by integrating the hydrogen concentration in the second time.

3. The hydrogen leakage detection method for a hydrogen energy vehicle according to claim 1, characterized in that the first time and the second time are set in accordance with a mounting position of the hydrogen concentration sensor and a distance between the hydrogen concentration sensor and a position where hydrogen leakage is likely.

4. A hydrogen leakage detection method for a hydrogen energy-powered vehicle as claimed in claim 1, characterized in that the first set hydrogen concentration is set based on a mounting position of the hydrogen concentration sensor and a distance between the hydrogen concentration sensor and a position where hydrogen leakage is likely.

5. A hydrogen-energy-source-vehicle hydrogen leakage detection method according to claim 1, characterized in that the second hydrogen concentration limit value is equal to a product of a second set hydrogen concentration and a second hydrogen concentration correction coefficient.

6. The hydrogen leakage detection method for a hydrogen energy-powered vehicle according to claim 5, characterized in that the second hydrogen concentration correction factor is obtained from a second hydrogen concentration correction factor-vehicle speed relationship table in accordance with a vehicle running speed.

7. A hydrogen leakage detection method for a hydrogen energy-source vehicle according to claim 5, characterized in that the second set hydrogen concentration is set based on a mounting position of the hydrogen concentration sensor and a distance between the hydrogen concentration sensor and a position where hydrogen leakage is likely.

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