A methanol engine monitoring method for a full methanol compression ignition loader

Abstract

The present invention discloses a methanol engine monitoring method for a full methanol compression ignition loader, the methanol engine monitoring method comprising: the vehicle controller monitors the exhaust temperature of each cylinder of the methanol engine in real time through an exhaust temperature detection device, and the vehicle controller combines the methanol engine parameters input by the engine electronic control unit to determine whether the methanol engine is abnormal. The present invention can monitor the methanol engine so as to timely discover the abnormality of the methanol engine, thereby effectively protecting the methanol engine; in addition, the present invention can also accurately determine the problem points of the abnormality of the methanol engine, making it convenient for maintenance personnel to perform maintenance.

Description

Technical Field

[0001] The invention relates to the field of loaders, in particular to a methanol engine monitoring method of a full methanol compression ignition loader. Background Art

[0002] The three essential elements for existing engine combustion include combustibles, combustion-supporting materials and ignition sources; the corresponding engine parts are the fuel supply system, intake system and ignition system. When the engine is used for a long time, some faults will inevitably occur in the parts; for example: for the fuel supply system, after the engine has been working for a long time, the injector and the injection pump may have abnormal faults such as wear, blockage, and abnormal fuel supply. If not handled in time, it will cause damage to related parts such as connecting rods and sleeves; and for the intake system, if the engine air filter is blocked, the throttle is stuck, etc., causing poor engine intake, it will lead to insufficient power and eventually cause the engine to stall. At the same time, dust entering the engine combustion chamber will cause wear of parts and even cause serious consequences of engine cylinder scuffing; for the ignition system, such as a single-fuel methanol compression ignition engine that uses a preheat plug to assist the combustion of methanol, the preheat plug will eventually face the situation of preheat plug aging after a long period of continuous heating. The preheat plug is prone to failure after aging, which will cause serious consequences of engine cylinder scuffing. From the foregoing, it can be seen that the working status of the engine needs to be analyzed so that the engine can be shut down and an alarm can be sounded in time when an abnormality occurs, thereby avoiding serious damage to the engine.

[0003] However, as a new type of energy engine, the methanol engine used in the all-methanol compression ignition loader has insufficient test verification data for its application in vehicles, and it is impossible to accurately analyze the working status of each cylinder of the methanol engine through data model building, so it is impossible to accurately judge the working status of each cylinder of the methanol engine.

[0004] In view of the above problems, it is necessary to study a methanol engine monitoring method for a full methanol compression ignition loader, which is used to monitor the methanol engine so as to detect abnormalities of the methanol engine in time. Summary of the invention

[0005] The object of the present invention is to provide a methanol engine monitoring method for an all-methanol compression ignition loader, which is used to monitor the methanol engine so as to promptly discover the abnormality of the methanol engine.

[0006] In order to achieve the above object, the solution of the present invention is:

[0007] A methanol engine monitoring method for an all-methanol compression ignition loader is based on a methanol engine monitoring system; the methanol engine monitoring system comprises a vehicle controller, an exhaust temperature detection device, and an engine electronic control unit; the exhaust temperature detection device comprises a plurality of exhaust temperature sensors for respectively detecting the exhaust temperature of each cylinder of the methanol engine; each exhaust temperature sensor is electrically connected to the vehicle controller; the engine electronic control unit is electrically connected to the vehicle controller; the engine electronic control unit is used to input methanol engine parameters to the vehicle controller; the methanol engine parameters include the speed of the methanol engine, the output torque, the throttle opening, the working current of each preheating plug, and the engine exhaust temperature MAP diagram at different speeds and different throttle openings;

[0008] The methanol engine monitoring method of an all-methanol compression ignition loader comprises:

[0009] The vehicle controller monitors the exhaust temperature of each cylinder of the methanol engine in real time through the exhaust temperature detection device. At the same time, the vehicle controller combines the methanol engine parameters input by the engine electronic control unit to determine whether the methanol engine is abnormal.

[0010] The vehicle controller determines whether the methanol engine is abnormal, including at least one of a first abnormality judgment, a second abnormality judgment, a third abnormality judgment, a fourth abnormality judgment, a fifth abnormality judgment, a sixth abnormality judgment, a seventh abnormality judgment and an eighth abnormality judgment.

[0011] The first abnormality judgment is: when the vehicle controller detects that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller also detects that the exhaust temperature of at least one cylinder of the methanol engine within the preset monitoring time is less than the minimum exhaust temperature value in the engine exhaust temperature MAP diagram and the working current of the glow plug corresponding to the cylinder is abnormal, then the vehicle controller determines that the methanol engine has an ignition system abnormality;

[0012] The second abnormality is judged as follows: when the vehicle controller detects a sudden change in speed and a sudden drop in output torque of the methanol engine, if the vehicle controller also detects that the difference in exhaust temperature between any two cylinders of the methanol engine is greater than a set difference threshold within a predetermined monitoring time, and the working current of the glow plug corresponding to the cylinder with the lower exhaust temperature of the two cylinders is abnormal, the vehicle controller determines that an ignition system abnormality occurs in the methanol engine.

[0013] When the vehicle controller determines that the methanol engine has an ignition system abnormality, the vehicle controller sends a speed limit message to the engine electronic control unit, so that the engine electronic control unit performs speed limit processing on the methanol engine so that the methanol engine speed is limited to idle speed.

[0014] The third abnormality judgment is: when the vehicle controller detects that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller also detects that the exhaust temperature of at least one cylinder of the methanol engine is less than the minimum exhaust temperature value in the engine exhaust temperature MAP diagram during the preset monitoring time and the working current of the glow plug corresponding to the cylinder is normal, then the vehicle controller determines that the methanol engine has an abnormality in the fuel supply system;

[0015] The fourth abnormality judgment is: when the vehicle controller monitors that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller also monitors that the difference in exhaust temperature between any two cylinders of the methanol engine is greater than the set difference threshold within the predetermined monitoring time, and the working current of the preheating plug corresponding to the cylinder with the lower exhaust temperature among the two cylinders is normal, the vehicle controller determines that the methanol engine has an abnormality in the fuel supply system.

[0016] When the vehicle controller determines that the methanol engine has an abnormality in the fuel supply system, the vehicle controller sends a speed limit message to the engine electronic control unit, so that the engine electronic control unit performs speed limit processing on the methanol engine, so that the methanol engine speed is limited to 50% of the rated speed.

[0017] The fifth abnormality is judged as follows: when the vehicle controller detects a sudden change in speed and a sudden drop in output torque of the methanol engine, if the vehicle controller also detects that the exhaust temperature in each cylinder of the methanol engine is lower than the normal exhaust temperature range value in the engine exhaust temperature MAP diagram within the preset monitoring time, and the working current of the preheating plugs corresponding to each cylinder of the methanol engine is normal, then the vehicle controller determines that the methanol engine has an abnormality in the intake system or fuel supply system.

[0018] When the vehicle controller determines that the methanol engine has an abnormality in the intake system or fuel supply system, the vehicle controller sends a speed limit message to the engine electronic control unit, so that the engine electronic control unit performs speed limit processing on the methanol engine, so that the methanol engine speed will be limited to idle speed.

[0019] The sixth abnormality judgment is: when the methanol engine cannot be started, if the vehicle controller detects that the working current of the glow plugs corresponding to each cylinder of the methanol engine is abnormal, the vehicle controller determines that the methanol engine has an ignition system abnormality;

[0020] The seventh abnormality judgment is: when the methanol engine cannot be started, if the vehicle controller detects that the working current of the glow plugs corresponding to each cylinder of the methanol engine is normal, the vehicle controller determines that the fuel supply system or the air intake system of the methanol engine is abnormal;

[0021] The eighth abnormality is judged as follows: when the vehicle controller monitors that the speed, output torque and working current of each preheating plug of the methanol engine are normal, if the vehicle controller also monitors that the exhaust temperature of at least one cylinder of the methanol engine within the preset monitoring time is less than the minimum exhaust temperature value in the engine exhaust temperature MAP diagram, or the vehicle controller also monitors that the difference in exhaust temperature between any two cylinders of the methanol engine is greater than the set difference threshold within the preset monitoring time, then the vehicle controller determines that the exhaust temperature detection device of the methanol engine is abnormal.

[0022] When the vehicle controller determines that the methanol engine has an abnormality, the vehicle controller sends a corresponding abnormality message to the instrument and feeds back the corresponding abnormality.

[0023] After adopting the above scheme, the vehicle controller of the present invention monitors the exhaust temperature of each cylinder of the methanol engine in real time through the exhaust temperature detection device, and at the same time, the vehicle controller combines the methanol engine parameters input by the engine electronic control unit to determine whether the methanol engine is abnormal, thereby realizing the monitoring of the methanol engine, so as to timely discover the abnormality of the methanol engine, which helps to protect the methanol engine. In addition, the present invention can also accurately determine the problem points of the abnormality of the methanol engine, which is convenient for maintenance personnel to perform maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The schematic diagram of the methanol engine monitoring system of the present invention is shown in FIG.

[0025] Description of labels:

[0026] Cylinder 1, exhaust temperature sensor 2, exhaust manifold 3, glow plug 4, current sensor 5, engine electronic control unit 6, vehicle controller 7, instrument 8. DETAILED DESCRIPTION

[0027] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0028] like Figure 1As shown, the present invention discloses a methanol engine monitoring system of a full methanol compression ignition loader, which includes a vehicle controller 7, an exhaust temperature detection device, and an engine electronic control unit 6; wherein the exhaust temperature detection device includes a plurality of exhaust temperature sensors 2 for respectively detecting the exhaust temperature of each cylinder 1 of the methanol engine, each exhaust temperature sensor 2 of the exhaust temperature detection device can be specifically arranged between each cylinder 1 of the methanol engine and each exhaust manifold 3, and each exhaust temperature sensor 2 of the exhaust temperature detection device is electrically connected to the vehicle controller 7; the engine electronic control unit 6 is electrically connected to the vehicle controller 7, and the engine electronic control unit 6 is used to input methanol engine parameters to the vehicle controller 7; the methanol engine parameters include the speed of the methanol engine, the output torque, the throttle opening, the working current of each preheat plug 4, and the engine exhaust temperature MAP diagram at different speeds and different throttle openings; the working current of the preheat plug 4 can be detected by the current sensor 5.

[0029] The present invention also discloses a methanol engine monitoring method for an all-methanol compression ignition loader, which is based on the methanol engine monitoring system as described above; the methanol engine monitoring method for an all-methanol compression ignition loader specifically includes: the vehicle controller 7 monitors the exhaust temperature of each cylinder 1 of the methanol engine in real time through an exhaust temperature detection device, and at the same time, the vehicle controller 7 determines whether the methanol engine is abnormal in combination with the methanol engine parameters input by the engine electronic control unit 6; the vehicle controller 7 determines whether the methanol engine is abnormal, including at least one of a first abnormality judgment, a second abnormality judgment, a third abnormality judgment, a fourth abnormality judgment, a fifth abnormality judgment, a sixth abnormality judgment, a seventh abnormality judgment and an eighth abnormality judgment.

[0030] In an embodiment of the present invention, the first abnormality is judged as follows: when the vehicle controller 7 detects that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller 7 also detects that the exhaust temperature of at least one cylinder 1 of the methanol engine within a preset monitoring time (which may be 1 minute) is less than the minimum exhaust temperature value in the engine exhaust temperature MAP diagram and the working current of the preheat plug 4 corresponding to the cylinder 1 is abnormal, then the vehicle controller 7 determines that the methanol engine has an ignition system abnormality; at this time, the vehicle controller 7 may send a speed limit message to the engine electronic control unit 6, so that the engine electronic control unit 6 performs speed limit processing on the methanol engine and the speed of the methanol engine is limited to idle speed; at the same time, the vehicle controller 7 may also send an ignition system abnormality message to the instrument 8 to feedback the abnormality of the methanol engine ignition system and remind the user to perform timely maintenance.

[0031] In an embodiment of the present invention, the second abnormality is judged as follows: when the vehicle controller 7 detects that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller 7 also detects that the difference in exhaust temperature between any two cylinders 1 of each cylinder 1 of the methanol engine is greater than a set difference threshold within a predetermined monitoring time (which may be 1 minute), and the working current of the preheat plug 4 corresponding to the cylinder 1 with the lower exhaust temperature of the two cylinders 1 is abnormal, then the vehicle controller 7 determines that the methanol engine has an ignition system abnormality; at this time, the vehicle controller 7 may send a speed limit message to the engine electronic control unit 6, so that the engine electronic control unit 6 performs speed limit processing on the methanol engine and limits the speed of the methanol engine to idle speed; at the same time, the vehicle controller 7 may also send an ignition system abnormality message to the instrument 8 to feedback the abnormality of the methanol engine ignition system and remind the user to perform timely maintenance.

[0032] In an embodiment of the present invention, the third abnormality is judged as follows: when the vehicle controller 7 detects that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller 7 also detects that the exhaust temperature of at least one cylinder 1 of the methanol engine is less than the minimum exhaust temperature value in the engine exhaust temperature MAP diagram during the preset monitoring time (which may be 1 minute) and the working current of the preheat plug 4 corresponding to the cylinder 1 is normal, then the vehicle controller 7 determines that the methanol engine has a fuel supply system abnormality; at this time, the vehicle controller 7 may send a speed limit message to the engine electronic control unit 6, so that the engine electronic control unit 6 performs speed limit processing on the methanol engine and the speed of the methanol engine is limited to 50% of the rated speed; at the same time, the vehicle controller 7 may also send a fuel supply system abnormality message to the instrument 8 to feedback the abnormality of the methanol engine fuel supply system and remind the user to perform timely maintenance.

[0033] In an embodiment of the present invention, the fourth abnormality is judged as follows: when the vehicle controller 7 detects that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller 7 also detects that the difference in exhaust temperature between any two cylinders 1 of each cylinder 1 of the methanol engine is greater than a set difference threshold (which may be 150°C) within a predetermined monitoring time (which may be 1 minute), and the working current of the preheating plug 4 corresponding to the cylinder 1 with the lower exhaust temperature of the two cylinders 1 is normal, then the vehicle controller 7 determines that the methanol engine has an abnormal fuel supply system; at this time, the vehicle controller 7 may send a speed limit message to the engine electronic control unit 6, so that the engine electronic control unit 6 performs speed limit processing on the methanol engine and limits the speed of the methanol engine to 50% of the rated speed; at the same time, the vehicle controller 7 may also send an abnormal fuel supply system message to the instrument 8 to feedback the abnormal fuel supply system of the methanol engine and remind the user to perform timely maintenance.

[0034] In an embodiment of the present invention, the fifth abnormality is judged as follows: when the vehicle controller 7 detects that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller 7 also detects that the exhaust temperature in each cylinder 1 of the methanol engine is lower than the normal exhaust temperature range value in the engine exhaust temperature MAP diagram within a preset monitoring time (which may be 1 minute), and the working current of the preheat plug 4 corresponding to each cylinder 1 of the methanol engine is normal, then the vehicle controller 7 determines that the methanol engine has an intake system or a fuel supply system abnormality; at this time, the vehicle controller 7 may send a speed limit message to the engine electronic control unit 6, so that the engine electronic control unit 6 performs speed limit processing on the methanol engine so that the speed of the methanol engine will be limited to idle speed; at the same time, the vehicle controller 7 may also send an intake system or a fuel supply system abnormality message to the instrument 8, feedback the intake system or the fuel supply system abnormality of the methanol engine, and remind the user to perform timely maintenance.

[0035] In an embodiment of the present invention, the sixth abnormality is judged as follows: when the methanol engine cannot be started, if the vehicle controller 7 detects that the working currents of the preheat plugs 4 corresponding to the cylinders 1 of the methanol engine are all abnormal, the vehicle controller 7 determines that the methanol engine has an ignition system abnormality; at this time, the vehicle controller 7 can send an ignition system abnormality message to the instrument 8, feedback the methanol engine ignition system abnormality, and remind the user to repair it in time.

[0036] In an embodiment of the present invention, the seventh abnormality is judged as follows: when the methanol engine cannot start, if the vehicle controller 7 detects that the working currents of the preheat plugs 4 corresponding to the cylinders 1 of the methanol engine are normal, the vehicle controller 7 determines that the methanol engine has an abnormality in the fuel supply system or the air intake system; at this time, the vehicle controller 7 can send an abnormality message of the fuel supply system or the air intake system to the instrument 8, feedback the abnormality of the fuel supply system or the air intake system of the methanol engine, and remind the user to carry out repairs in time.

[0037] In an embodiment of the present invention, the eighth abnormality is judged as follows: when the vehicle controller 7 monitors that the speed, output torque and working current of each preheating plug 4 of the methanol engine are normal, if the vehicle controller 7 also monitors that the exhaust temperature of at least one cylinder 1 of the methanol engine within the preset monitoring time is less than the minimum exhaust temperature value in the engine exhaust temperature MAP diagram, or the vehicle controller 7 also monitors that the difference in exhaust temperature between any two cylinders 1 of each cylinder 1 of the methanol engine is greater than the set difference threshold within the predetermined monitoring time, then the vehicle controller 7 judges that the exhaust temperature detection device of the methanol engine is abnormal; at this time, the vehicle controller 7 may send an abnormality message of the exhaust temperature detection device to the instrument 8, feedback the abnormality of the exhaust temperature detection device, and remind the user to repair it in time.

[0038] In the embodiment of the present invention, a sudden change in speed means that, under non-throttle control, the speed of the methanol engine drops instantly and the drop is more than 300 revolutions. A sudden drop in output torque means that, under non-throttle control, the output torque of the methanol engine drops instantly and the drop is more than 200 Nm.

[0039] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A method for monitoring a methanol engine of an all-methanol compression ignition loader, characterized in that: The methanol engine monitoring method of a full methanol compression ignition loader is based on a methanol engine monitoring system; the methanol engine monitoring system includes a vehicle controller, an exhaust temperature detection device, and an engine electronic control unit, the exhaust temperature detection device includes a plurality of exhaust temperature sensors for respectively detecting the exhaust temperature of each cylinder of the methanol engine, each exhaust temperature sensor is electrically connected to the vehicle controller, the engine electronic control unit is electrically connected to the vehicle controller, and the engine electronic control unit is used to input methanol engine parameters to the vehicle controller; the methanol engine parameters include the speed of the methanol engine, the output torque, the throttle opening, the working current of each preheating plug, and the engine exhaust temperature MAP diagram at different speeds and different throttle openings; The methanol engine monitoring method of an all-methanol compression ignition loader comprises: The vehicle controller monitors the exhaust temperature of each cylinder of the methanol engine in real time through the exhaust temperature detection device. At the same time, the vehicle controller combines the methanol engine parameters input by the engine electronic control unit to determine whether the methanol engine is abnormal; The vehicle controller determines whether the methanol engine is abnormal, including a first abnormality determination and a second abnormality determination; The first abnormality judgment is: when the vehicle controller detects that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller also detects that the exhaust temperature of at least one cylinder of the methanol engine within the preset monitoring time is less than the minimum exhaust temperature value in the engine exhaust temperature MAP diagram and the working current of the glow plug corresponding to the cylinder is abnormal, then the vehicle controller determines that the methanol engine has an ignition system abnormality; The second abnormality is judged as follows: when the vehicle controller detects a sudden change in speed and a sudden drop in output torque of the methanol engine, if the vehicle controller also detects that the difference in exhaust temperature between any two cylinders of the methanol engine is greater than a set difference threshold within a predetermined monitoring time, and the working current of the glow plug corresponding to the cylinder with the lower exhaust temperature of the two cylinders is abnormal, the vehicle controller determines that an ignition system abnormality occurs in the methanol engine.

2. The method for monitoring a methanol engine of an all-methanol compression ignition loader according to claim 1, characterized in that: The vehicle controller determines whether the methanol engine is abnormal and also includes at least one of a third abnormality judgment, a fourth abnormality judgment, a fifth abnormality judgment, a sixth abnormality judgment, a seventh abnormality judgment and an eighth abnormality judgment.

3. The method for monitoring a methanol engine of an all-methanol compression ignition loader according to claim 1, characterized in that: When the vehicle controller determines that the methanol engine has an ignition system abnormality, the vehicle controller sends a speed limit message to the engine electronic control unit, so that the engine electronic control unit performs speed limit processing on the methanol engine so that the methanol engine speed is limited to idle speed.

4. The method for monitoring a methanol engine of an all-methanol compression ignition loader according to claim 2, characterized in that: The third abnormality judgment is: when the vehicle controller detects that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller also detects that the exhaust temperature of at least one cylinder of the methanol engine is less than the minimum exhaust temperature value in the engine exhaust temperature MAP diagram during the preset monitoring time and the working current of the glow plug corresponding to the cylinder is normal, then the vehicle controller determines that the methanol engine has an abnormality in the fuel supply system; The fourth abnormality judgment is: when the vehicle controller monitors that the methanol engine has a sudden change in speed and a sudden drop in output torque, if the vehicle controller also monitors that the difference in exhaust temperature between any two cylinders of the methanol engine is greater than the set difference threshold within the predetermined monitoring time, and the working current of the preheating plug corresponding to the cylinder with the lower exhaust temperature among the two cylinders is normal, the vehicle controller determines that the methanol engine has an abnormality in the fuel supply system.

5. The method for monitoring a methanol engine of an all-methanol compression ignition loader according to claim 4, characterized in that: When the vehicle controller determines that the methanol engine has an abnormality in the fuel supply system, the vehicle controller sends a speed limit message to the engine electronic control unit, so that the engine electronic control unit performs speed limit processing on the methanol engine, so that the methanol engine speed is limited to 50% of the rated speed.

6. The method for monitoring a methanol engine of an all-methanol compression ignition loader according to claim 2, characterized in that: The fifth abnormality is judged as follows: when the vehicle controller detects a sudden change in speed and a sudden drop in output torque of the methanol engine, if the vehicle controller also detects that the exhaust temperature in each cylinder of the methanol engine is lower than the normal exhaust temperature range value in the engine exhaust temperature MAP diagram within the preset monitoring time, and the working current of the preheating plugs corresponding to each cylinder of the methanol engine is normal, then the vehicle controller determines that the methanol engine has an abnormality in the intake system or fuel supply system.

7. The method for monitoring a methanol engine of an all-methanol compression ignition loader according to claim 6, characterized in that: When the vehicle controller determines that the methanol engine has an abnormality in the intake system or fuel supply system, the vehicle controller sends a speed limit message to the engine electronic control unit, so that the engine electronic control unit performs speed limit processing on the methanol engine, so that the methanol engine speed will be limited to idle speed.

8. The method for monitoring a methanol engine of an all-methanol compression ignition loader according to claim 2, characterized in that: The sixth abnormality judgment is: when the methanol engine cannot be started, if the vehicle controller detects that the working current of the glow plugs corresponding to each cylinder of the methanol engine is abnormal, the vehicle controller determines that the methanol engine has an ignition system abnormality; The seventh abnormality judgment is: when the methanol engine cannot be started, if the vehicle controller detects that the working current of the glow plugs corresponding to each cylinder of the methanol engine is normal, the vehicle controller judges that the fuel supply system or the air intake system of the methanol engine is abnormal; The eighth abnormality is judged as follows: when the vehicle controller monitors that the speed, output torque and working current of each preheating plug of the methanol engine are normal, if the vehicle controller also monitors that the exhaust temperature of at least one cylinder of the methanol engine within the preset monitoring time is less than the minimum exhaust temperature value in the engine exhaust temperature MAP diagram, or the vehicle controller also monitors that the difference in exhaust temperature between any two cylinders of the methanol engine is greater than the set difference threshold within the preset monitoring time, then the vehicle controller determines that the exhaust temperature detection device of the methanol engine is abnormal.

9. A method for monitoring a methanol engine of an all-methanol compression ignition loader according to any one of claims 1 to 8, characterized in that: When the vehicle controller determines that the methanol engine has an abnormality, the vehicle controller sends a corresponding abnormality message to the instrument and feeds back the corresponding abnormality.

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