Intelligent control device and control method for safe fuel cut-off of dynamometer rack

Abstract

The invention relates to an intelligent control device and a control method for safe fuel cut-off of a dynamometer rack. The device comprises a dynamometer rack, a fuel consumption measuring system, a fuel supply system, a first gas alarm, a second gas alarm, a third gas alarm, a fourth gas alarm, a gas alarm system, a stop valve and an exhaust fan. The control method comprises the steps that according to oil consumption in an oil consumption measuring system, when an error set by a dynamometer rack system within 10 S exceeds 20% of a standard value, it is judged that leakage possibly exists in a fuel oil supply pipeline and the oil consumption measuring system, and a dynamometer rack gives an alarm or when any oil consumption value is under a constant load working condition in the test process, the leakage condition is judged to be abnormal; according to calculated values of an oil tank pressure sensor and a flow float switch of the oil consumption testing system, the oil tank liquid level decline variable quantity within 3S is read, if the oil tank liquid level decline difference value is larger than or equal to 30 mm, it is judged that the fuel oil supply pipeline and the oil consumption measuring system possibly have the leakage condition, and the dynamometer rack gives an alarm. When the problem of gasoline fuel leakage occurs, an alarm can be given in time, and fuel is cut off rapidly.

Description

Technical Field

[0001] The invention belongs to the field of automobile technology, and in particular to an intelligent control device and a control method for safe oil cut-off of a dynamometer bench. Background Art

[0002] When a complete vehicle is tested on a dynamometer, gasoline fuel is needed to measure fuel consumption, and gasoline fuel leakage may occur occasionally. Currently, there is no gasoline fuel leakage alarm monitoring and control system on site, and it can only be checked regularly by patrol personnel. As a result, the dynamometer cannot be discovered in the first time when a gasoline fuel leakage alarm occurs occasionally, and the system control cannot be used to automatically and safely cut off the fuel supply in the first time. In addition, gasoline evaporates very quickly and is extremely dangerous, which increases the safety risks of personnel and tests, and also causes waste of gasoline fuel. Summary of the invention

[0003] In order to solve the above problems, the present invention provides an intelligent control device and control method for safe fuel cut-off of a dynamometer bench, which can monitor data such as fuel pressure, fuel consumption and gas concentration after gasoline fuel leakage in real time. When a gasoline fuel leakage problem occurs, an alarm is issued in time and the fuel is quickly cut off, thereby improving the safety of personnel and test operations and reducing the waste of gasoline fuel.

[0004] The technical solution of the present invention is described as follows in conjunction with the accompanying drawings:

[0005] In the first aspect, the present invention provides an intelligent control device for safe fuel cut-off of a dynamometer bench, comprising a dynamometer bench 1, a fuel consumption measurement system 2, a fuel supply system 3, a first gas alarm 4, a second gas alarm 5, a third gas alarm 6, a fourth gas alarm 7, a gas alarm system 8, a shut-off valve 12 and an exhaust fan 13; the dynamometer bench 1 is connected to the fuel consumption measurement system 2; the fuel consumption measurement system 2 is connected to the fuel supply system 3 and a vehicle; the first gas alarm is installed on the connecting pipeline between the fuel supply system 3 and the fuel consumption measurement system 2 Alarm device 4; a second gas alarm device 5 is installed in the pipeline of the fuel consumption measuring system 2 supplying fuel to the whole vehicle; a third gas alarm device 6 is installed at the lower right of the fuel consumption measuring system 2; a fourth gas alarm device 7 is installed at the upper left of the fuel consumption measuring system 2; the first gas alarm device 4, the second gas alarm device 5, the third gas alarm device 6, the fourth gas alarm device 7 are connected to the gas alarm system 8; a shut-off valve 12 is provided between the fuel consumption measuring system 2 and the fuel supply system 3; an exhaust fan 13 is added to the dynamometer bench 1 in the test room.

[0006] Furthermore, the fuel consumption measurement system 2 adopts a fuel consumption meter 17 .

[0007] Furthermore, the fuel consumption measurement system 2 uses a consumption system oil tank 14 , a flow float switch 15 and an oil tank pressure sensor 16 .

[0008] Furthermore, the gas alarm system 8 includes a main controller 9 , a display screen 10 and a buzzer 11 .

[0009] Furthermore, the exhaust fan 13 is a dual-speed exhaust fan capable of running at high speed and low speed.

[0010] In a second aspect, the present invention further provides a control method for a dynamometer test bench safe oil cut-off intelligent control device, comprising the following steps:

[0011] S11, any fuel consumption value under constant load conditions, the standard fuel consumption value X is measured according to the fuel consumption meter 17; during actual operation, the actual fuel consumption value Y is measured according to the fuel consumption meter 17;

[0012] S12, whether the fuel consumption error ratio within 10 seconds set by the dynamometer bench 1, i.e., YX / X*100%, exceeds 20% of the standard value;

[0013] S13, if the fuel consumption error within 10 seconds does not exceed 20% of the standard value, the system operates normally; if the fuel consumption error within 10 seconds exceeds or is equal to 20% of the standard value, it is determined that there may be leakage in the fuel supply pipeline and the fuel consumption measurement system 2, the dynamometer bench 1 alarms, and prompts the bench operator to check whether there is fuel leakage on site;

[0014] S14. If the personnel confirm that there is no fuel leakage, the dynamometer stand 1 is reset and the device resumes normal operation; if the personnel confirm that there is a fuel leakage, the gas alarm system 8 is started synchronously, and the exhaust fan 13 is operated at high speed or low speed according to different gas concentrations.

[0015] In a third aspect, the present invention provides a control method for a dynamometer test bench safe oil cut-off intelligent control device, comprising the following steps:

[0016] S21. According to all loads of the current vehicle model, the flow float switch 15 and the tank pressure sensor 16 in the consumption system tank 14 are used to measure, record and calculate the fuel consumption standard value X, fuel consumption rate standard value Z and fuel consumption level standard value of all loads;

[0017] S22. For any fuel consumption value under constant load conditions, the standard value Z of fuel consumption rate is fixed. The dynamometer bench 1 sets the fuel consumption level drop standard value A of the consumption system tank 14 within 3 seconds and the actual fuel consumption level measurement value B. Whether the drop difference BA is greater than 30 mm;

[0018] S23, if the difference BA of the fuel consumption level drop in the consumption system tank 14 is less than 30mm within 3s, the system is operating normally; if the difference BA of the fuel consumption level drop in the consumption system tank 14 is less than or equal to 30mm within 3s, it is determined that there may be leakage in the fuel supply pipeline and the fuel consumption measurement system 2, the dynamometer bench 1 will alarm, and prompt the bench operator to check whether there is fuel leakage on site;

[0019] S24. If the personnel confirm that there is no fuel leakage, the dynamometer stand 1 is reset and the device resumes normal operation; if the personnel confirm that there is a fuel leakage, the gas alarm control system 8 is started synchronously, and the exhaust fan 13 is operated at high speed or low speed according to different gas concentrations.

[0020] Furthermore, the method for starting the gas alarm system 8 is as follows:

[0021] The first gas alarm 4, the second gas alarm 5, the third gas alarm 6, and the fourth gas alarm 7 detect gas concentrations simultaneously;

[0022] When any of the first gas alarm 4, the second gas alarm 5, the third gas alarm 6, and the fourth gas alarm 7 detects a gas leak, the display screen 10 of the gas alarm system 8 will display the gas alarm at the corresponding numbered position and the excessive concentration; the dynamometer stand 1 transmits the gas alarm signal to the control system in the dynamometer stand 1 through I / O communication with the gas alarm system 8, thereby realizing online monitoring, real-time data transmission, and setting the secondary alarm threshold.

[0023] Furthermore, when the gas alarm detects that the gas concentration is less than 25%LEL, the system operates normally; when the gas alarm detects that 25%LEL≤gas concentration<40%LEL, the first level warning is enabled, the shut-off valve 12 is closed, the buzzer 11 alarms, the dynamometer stand 1 alarms, and the exhaust fan runs at a low speed; when the gas alarm detects that the gas concentration is greater than or equal to 40%LEL, the second level warning is enabled, the shut-off valve 12 is closed, the buzzer 11 alarms, the dynamometer stand 1 alarms, and the exhaust fan runs at a high speed.

[0024] The beneficial effects of the present invention are:

[0025] 1) The present invention utilizes a dynamometer bench and a fuel consumption measurement system to monitor fuel leakage in the fuel pipeline and its ancillary facilities through algorithms and Internet of Things based on fuel consumption, and adds four gas detection alarms (CH4 gas detection) near the fuel consumption measurement system and the ancillary gasoline fuel pipeline. When fuel leakage occurs in the gasoline fuel pipeline, gas detection alarms at different locations detect that the gas concentration in the surrounding area exceeds the standard, and a two-level alarm is activated. At this time, the buzzer of the gas alarm will emit two alarm sounds of different frequencies, and immediately remind the on-site operator to check the gas detection alarm at the current alarm position on the display screen, so that the alarm position can be found intuitively;

[0026] 2) The gas alarm system of the present invention integrates a dynamometer bench to synchronize alarm information. According to the range of different gas concentration exceeding the standard, it determines whether it is necessary to stop the current operating test equipment, automatically starts the exhaust fan, and quickly dilutes the gas. At this time, the operation and maintenance personnel can quickly conduct on-site inspections and repairs, realize real-time online monitoring and rapid repairs, and discover and deal with problems in advance before the fire protection system intervenes, ensuring the safe and efficient operation of the laboratory;

[0027] 3) The present invention has a high degree of automation, a novel method, clear control logic, is easy to understand, and has strong practicality, thus ensuring the smooth progress of the vehicle bench test. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a structural schematic diagram of an intelligent control device for safe oil cut-off of a dynamometer bench according to the present invention;

[0030] Figure 2 This is a flow chart of a dynamometer test bench safe oil cut-off intelligent control method according to the present invention;

[0031] Figure 3 It is a flow chart of another intelligent control method for safe oil cut-off of a dynamometer bench according to the present invention;

[0032] Figure 4 This is a flow chart of the method for starting the gas alarm system of the present invention.

[0033] In the figure:

[0034] 1. Dynamometer stand; 2. Fuel consumption measurement system; 3. Fuel supply system; 4. First gas alarm; 5. Second gas alarm; 6. Second gas alarm; 7. Fourth gas alarm; 8. Gas alarm system; 9. Gas alarm system; 10. Display screen; 11. Buzzer; 12. Shut-off valve; 13. Exhaust fan; 14. Consumption system oil tank; 15. Flow float switch; 16. Oil tank pressure sensor; 17. Fuel consumption meter. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0037] Embodiment 1

[0038] See also Figure 1 The present embodiment provides an intelligent control device for safe oil cut-off of a dynamometer bench, comprising a dynamometer bench 1, a fuel consumption measurement system 2, a fuel supply system 3, a first gas alarm 4, a second gas alarm 5, a third gas alarm 6, a fourth gas alarm 7, a gas alarm system 8, a shut-off valve 12 and an exhaust fan 13.

[0039] The dynamometer bench 1 is connected to the fuel consumption measurement system 2; the fuel consumption measurement system 2 is connected to the fuel supply system 3 and the vehicle; a first gas alarm 4 is installed on the connecting pipeline between the fuel supply system 3 and the fuel consumption measurement system 2; a second gas alarm 5 is installed in the pipeline of the fuel consumption measurement system 2 that supplies fuel to the whole vehicle; a third gas alarm 6 is installed at the lower right of the fuel consumption measurement system 2; a fourth gas alarm 7 is installed at the upper left of the fuel consumption measurement system 2; the first gas alarm 4, the second gas alarm 5, the third gas alarm 6, and the fourth gas alarm 7 are connected to the gas alarm system 8; a shut-off valve 12 is provided between the fuel consumption measurement system 2 and the fuel supply system 3; an exhaust fan 13 is added to the dynamometer bench 1 in the test room.

[0040] Furthermore, the fuel consumption measurement system 2 adopts a fuel consumption meter 17 or a consumption system oil tank 14 , a flow float switch 15 and an oil tank pressure sensor 16 .

[0041] The gas alarm system 8 includes a main controller 9 , a display screen 10 and a buzzer 11 .

[0042] The exhaust fan 13 is a dual-speed exhaust fan capable of high-speed operation and low-speed operation, and the parameters of the high-speed operation and the low-speed operation are set in advance.

[0043] Embodiment 2

[0044] See also Figure 2 This embodiment provides a control method for a dynamometer test bench safe oil cut-off intelligent control device, comprising the following steps:

[0045] S11, any fuel consumption value under constant load conditions, the standard fuel consumption value X is measured according to the fuel consumption meter 17; during actual operation, the actual fuel consumption value Y is measured according to the fuel consumption meter 17;

[0046] S12, whether the fuel consumption error ratio within 10 seconds set by the dynamometer bench 1, i.e., YX / X*100%, exceeds 20% of the standard value;

[0047] S13, if the fuel consumption error within 10 seconds does not exceed 20% of the standard value, the system operates normally; if the fuel consumption error within 10 seconds exceeds or is equal to 20% of the standard value, it is determined that there may be leakage in the fuel supply pipeline and the fuel consumption measurement system 2, the dynamometer bench 1 alarms, and prompts the bench operator to check whether there is fuel leakage on site;

[0048] S14. If the personnel confirm that there is no fuel leakage, the dynamometer stand 1 is reset and the device resumes normal operation; if the personnel confirm that there is a fuel leakage, the gas alarm system 8 is started synchronously, and the exhaust fan 13 is operated at high speed or low speed according to different gas concentrations.

[0049] The method for starting the gas alarm system 8 is as follows:

[0050] The first gas alarm 4, the second gas alarm 5, the third gas alarm 6, and the fourth gas alarm 7 can detect gas concentrations simultaneously;

[0051] See also Figure 4When any of the first gas alarm 4, the second gas alarm 5, the third gas alarm 6, and the fourth gas alarm 7 detects a gas leak, the display screen 10 of the gas alarm system 8 will display the gas alarm at the corresponding numbered position and the excessive concentration; the dynamometer stand 1 transmits the gas alarm signal to the control system in the dynamometer stand 1 through I / O communication with the gas alarm system 8, thereby realizing online monitoring, real-time data transmission, and setting the secondary alarm threshold.

[0052] Furthermore, when the gas alarm detects that the gas concentration is less than 25%LEL, the system operates normally; when the gas alarm detects that 25%LEL≤gas concentration<40%LEL, the first level warning is enabled, the shut-off valve 12 is closed, the buzzer 11 alarms, the dynamometer stand 1 alarms, and the exhaust fan runs at a low speed; when the gas alarm detects that the gas concentration is greater than or equal to 40%LEL, the second level warning is enabled, the shut-off valve 12 is closed, the buzzer 11 alarms, the dynamometer stand 1 alarms, and the exhaust fan runs at a high speed.

[0053] Embodiment 3

[0054] See also Figure 3 This embodiment also provides a control method for a dynamometer test bench safe oil cut-off intelligent control device, comprising the following steps:

[0055] S21. According to all loads of the current vehicle model, the flow float switch 15 and the tank pressure sensor 16 in the consumption system tank 14 are used to measure, record and calculate the fuel consumption standard value X, fuel consumption rate standard value Z and fuel consumption level standard value of all loads;

[0056] S22. For any fuel consumption value under constant load conditions, the standard value Z of fuel consumption rate is fixed. The dynamometer bench 1 sets the fuel consumption level drop standard value A of the consumption system tank 14 within 3 seconds and the actual fuel consumption level measurement value B. Whether the drop difference BA is greater than 30 mm;

[0057] S23, if the difference BA of the fuel consumption level drop in the consumption system tank 14 is less than 30mm within 3s, the system is operating normally; if the difference BA of the fuel consumption level drop in the consumption system tank 14 is less than or equal to 30mm within 3s, it is determined that there may be leakage in the fuel supply pipeline and the fuel consumption measurement system 2, the dynamometer bench 1 will alarm, and prompt the bench operator to check whether there is fuel leakage on site;

[0058] S24. If the personnel confirm that there is no fuel leakage, the dynamometer stand 1 is reset and the device resumes normal operation; if the personnel confirm that there is a fuel leakage, the gas alarm control system 8 is started synchronously, and the exhaust fan 13 is operated at high speed or low speed according to different gas concentrations.

[0059] The method for starting the gas alarm system 8 is as follows:

[0060] The first gas alarm 4, the second gas alarm 5, the third gas alarm 6, and the fourth gas alarm 7 can detect gas concentrations simultaneously;

[0061] See also Figure 4 When any of the first gas alarm 4, the second gas alarm 5, the third gas alarm 6, and the fourth gas alarm 7 detects a gas leak, the display screen 10 of the gas alarm system 8 will display the gas alarm at the corresponding numbered position and the excessive concentration; the dynamometer stand 1 transmits the gas alarm signal to the control system in the dynamometer stand 1 through I / O communication with the gas alarm system 8, thereby realizing online monitoring, real-time data transmission, and setting the secondary alarm threshold.

[0062] Furthermore, when the gas alarm detects that the gas concentration is less than 25%LEL, the system operates normally; when the gas alarm detects that 25%LEL≤gas concentration<40%LEL, the first level warning is enabled, the shut-off valve 12 is closed, the buzzer 11 alarms, the dynamometer stand 1 alarms, and the exhaust fan runs at a low speed; when the gas alarm detects that the gas concentration is greater than or equal to 40%LEL, the second level warning is enabled, the shut-off valve 12 is closed, the buzzer 11 alarms, the dynamometer stand 1 alarms, and the exhaust fan runs at a high speed.

[0063] The gas alarm system is integrated with the dynamometer stand to synchronize alarm information. According to the range of gas concentration exceeding the standard, it determines whether it is necessary to stop the currently running test equipment and automatically starts the exhaust fan to quickly dilute the gas. At this time, the operation and maintenance personnel can quickly conduct on-site inspections and repairs, realize real-time online monitoring and rapid repairs, and discover and deal with problems in advance before the fire protection system intervenes, ensuring the safe and efficient operation of the laboratory.

[0064] In summary, the present invention has a high degree of automation, a novel method, clear control logic, is easy to understand, and has strong practicality, thus ensuring the smooth progress of the vehicle bench test.

[0065] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention. These simple variations all belong to the protection scope of the present invention.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0067] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An intelligent control device for safe oil cut-off of a dynamometer bench, characterized in that: The invention comprises a dynamometer stand (1), a fuel consumption measurement system (2), a fuel supply system (3), a first gas alarm (4), a second gas alarm (5), a third gas alarm (6), a fourth gas alarm (7), a gas alarm system (8), a cut-off valve (12) and an exhaust fan (13); the dynamometer stand (1) is connected to the fuel consumption measurement system (2); the fuel consumption measurement system (2) is connected to the fuel supply system (3) and a vehicle; the first gas alarm (4) is installed on the connecting pipeline between the fuel supply system (3) and the fuel consumption measurement system (2); the fuel consumption measurement system (2) is connected to the fuel supply system (3) and the vehicle; the fuel supply system (3) is connected to the fuel consumption measurement system (2) and the fuel supply system (3 ... supply system (3) and the vehicle; the fuel supply system (3) is connected to the fuel supply system (3) and the vehicle; the fuel supply system (3) is connected to the fuel supply system (3) and the vehicle; the fuel supply system (3) is connected to the fuel supply system (3) and the vehicle; the fuel supply system (3) is connected to the fuel supply system ) A second gas alarm (5) is installed in the pipeline for supplying fuel to the whole vehicle; a third gas alarm (6) is installed at the lower right of the fuel consumption measurement system (2); a fourth gas alarm (7) is installed at the upper left of the fuel consumption measurement system (2); the first gas alarm (4), the second gas alarm (5), the third gas alarm (6), and the fourth gas alarm (7) are connected to the gas alarm system (8); a shut-off valve (12) is provided between the fuel consumption measurement system (2) and the fuel supply system (3); and an exhaust fan (13) is added to the dynamometer bench (1) in the test room.

2. The intelligent control device for safe oil cut-off of a dynamometer bench according to claim 1 is characterized in that: The fuel consumption measurement system (2) adopts a fuel consumption meter (17).

3. The intelligent control device for safe oil cut-off of a dynamometer bench according to claim 1, characterized in that: The oil consumption measurement system (2) adopts a consumption system oil tank (14), a flow float switch (15) and an oil tank pressure sensor (16).

4. The intelligent control device for safe oil cut-off of a dynamometer bench according to claim 1, characterized in that: The gas alarm system (8) comprises a main controller (9), a display screen (10) and a buzzer (11).

5. The intelligent control device for safe oil cut-off of a dynamometer bench according to claim 1, characterized in that: The exhaust fan (13) is a dual-speed exhaust fan capable of running at high speed and low speed.

6. The control method of the intelligent control device for safe oil cut-off of a dynamometer bench according to claim 2 is characterized in that: The following steps are involved: S11, under a fixed load condition, a standard fuel consumption value X is measured by the fuel consumption meter (17); during actual operation, an actual fuel consumption value Y is measured by the fuel consumption meter (17); S12, dynamometer (1) sets the fuel consumption error ratio within 10 seconds, i.e. (YX) / X*100%, to see whether it exceeds 20% of the standard value; S13, if the fuel consumption error within 10 seconds does not exceed 20% of the standard value, the system operates normally; if the fuel consumption error within 10 seconds exceeds or is equal to 20% of the standard value, it is determined that there may be leakage in the fuel supply pipeline and the fuel consumption measurement system (2), the dynamometer bench (1) alarms, and prompts the bench operator to check whether there is fuel leakage on site; S14. If the personnel confirm that there is no fuel leakage, the dynamometer stand (1) is reset and the device resumes normal operation; if the personnel confirm that there is a fuel leakage, the gas alarm system (8) is started synchronously, and the exhaust fan (13) is operated at high speed or low speed according to different gas concentrations.

7. The control method of the intelligent control device for safe oil cut-off of a dynamometer bench according to claim 3 is characterized in that: The following steps are involved: S21, measuring all loads of the current vehicle model, using the flow float switch (15) and the tank pressure sensor (16) in the consumption system tank (14) to measure, record and calculate the fuel consumption standard value X, fuel consumption rate standard value Z and fuel consumption level standard value of all loads; S22. For any fuel consumption value under a constant load condition, the standard value Z of the fuel consumption rate is fixed. The dynamometer bench (1) sets the fuel consumption level drop standard value A of the fuel consumption tank (14) of the consumption system within 3 seconds and the actual fuel consumption level measurement value B. Whether the drop difference BA is greater than 30 mm; S23, if the difference BA of the fuel consumption level drop in the consumption system tank (14) within 3 seconds is less than 30 mm, the system is operating normally; if the difference BA of the fuel consumption level drop in the consumption system tank (14) within 3 seconds is less than or equal to 30 mm, it is determined that there may be leakage in the fuel supply pipeline and the fuel consumption measurement system (2), the dynamometer bench (1) issues an alarm, and prompts the bench operator to check whether there is fuel leakage on site; S24. If the personnel confirm that there is no fuel leakage, the dynamometer stand (1) is reset and the device resumes normal operation; if the personnel confirm that there is a fuel leakage, the gas alarm control system (8) is started synchronously, and the exhaust fan (13) is operated at high speed or low speed according to different gas concentrations.

8. The control method of the intelligent control device for safe oil cut-off of a dynamometer bench according to claim 6 or 7, characterized in that: The method for starting the gas alarm system (8) is as follows: The first gas alarm (4), the second gas alarm (5), the third gas alarm (6), and the fourth gas alarm (7) detect gas concentration simultaneously; When any of the first gas alarm (4), the second gas alarm (5), the third gas alarm (6) and the fourth gas alarm (7) detects a gas leak, the display screen (10) of the gas alarm system (8) will display the gas alarm at the corresponding numbered position and the excessive concentration; the dynamometer stand (1) transmits the gas alarm signal to the control system in the dynamometer stand (1) by performing I / O communication with the gas alarm system (8), thereby realizing online monitoring, real-time data transmission, and setting a secondary alarm threshold.

9. The control method of the intelligent control device for safe oil cut-off of a dynamometer bench according to claim 8 is characterized in that: When the gas alarm detects that the gas concentration is less than 25% LEL, the system operates normally; when the gas alarm detects that 25% LEL ≤ gas concentration < 40% LEL, the first level warning is activated, the shut-off valve (12) is closed, the buzzer (11) alarms, the dynamometer stand (1) alarms, and the exhaust fan operates at a low speed; when the gas alarm detects that the gas concentration is greater than or equal to 40% LEL, the second level warning is activated, the shut-off valve (12) is closed, the buzzer (11) alarms, the dynamometer stand (1) alarms, and the exhaust fan operates at a high speed.

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