Methanol engine emission control device, engine and vehicle

Abstract

The utility model discloses a methanol engine emission control device, an engine and a vehicle. The emission control device for the methanol engine comprises a formaldehyde sensor, a methanol sensor, a power management system, a tail gas treatment gas tank and a control valve, the formaldehyde sensor and the methanol sensor are arranged on an exhaust pipe of the engine; the control valve is arranged on a pipeline for connecting the tail gas treatment gas tank and the exhaust pipe; the power management system is in signal connection with the formaldehyde sensor, the methanol sensor, the tail gas treatment gas tank and the control valve, the tail gas treatment gas tank comprises an oxygen tank and a high-pressure air tank, and the power management system is used for controlling the control valve according to measured values of the sensors, so that gas in the oxygen tank and the high-pressure air tank enters the exhaust pipe according to a preset proportion. According to the emission control device for the methanol engine, the content of exhaust gas can be detected in real time in the running process of the methanol engine, tail gas emission is controlled according to the detection result, the engine can run safely and reliably, and environmental pollution can be reduced easily.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a methanol engine emission control device, an engine, and a vehicle. Background Art

[0002] Methanol engines have great potential for development because they emit low levels of carbon dioxide during combustion, helping to reduce environmental pollution, improve air quality, and meet increasingly stringent environmental regulations and emission standards. However, incomplete combustion in methanol engines under certain conditions can result in methanol and formaldehyde gases in their exhaust. These gases, released into the atmosphere, can affect air quality and the ecological environment. Therefore, there is an urgent need for a device to detect and control exhaust gases during methanol engine operation, enabling precise monitoring of engine operating conditions. Utility Model Content

[0003] The present application discloses a methanol engine emission control device, an engine, and a vehicle, which can detect exhaust gas in real time during the operation of the methanol engine and control tail gas emissions based on the detection results, so as to ensure safe and reliable operation of the engine and help reduce environmental pollution.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides a methanol engine emission control device, comprising a formaldehyde sensor, a methanol sensor, a power management system, an exhaust gas treatment tank, and a control valve;

[0006] The formaldehyde sensor and the methanol sensor are both arranged in the exhaust pipe of the engine, and are used to detect the formaldehyde content and the methanol content in the exhaust gas of the engine;

[0007] The tail gas treatment tank is connected to the exhaust pipe;

[0008] The control valve is arranged on the pipeline connecting the exhaust gas treatment tank and the exhaust pipe;

[0009] The power management system is signal-connected to the formaldehyde sensor, the methanol sensor, the exhaust gas treatment tank and the control valve. The exhaust gas treatment tank includes an oxygen tank and a high-pressure air tank. The power management system is used to control the control valve according to the formaldehyde content and methanol content detected by the formaldehyde sensor and the methanol sensor, so that the gas in the oxygen tank and the high-pressure air tank enters the exhaust pipe according to a preset ratio.

[0010] The methanol engine emission control device includes a formaldehyde sensor and a methanol sensor, both mounted on the engine's exhaust pipe for real-time detection of formaldehyde and methanol content in the engine's exhaust gas, respectively. Because formaldehyde and methanol gases can also cause environmental damage, this application also implements emission control for exhaust gases. The methanol engine emission control device also includes a power management system, an exhaust gas treatment tank, and a control valve. The exhaust gas treatment tank is connected to the exhaust pipe and includes an oxygen tank and a high-pressure air tank. The control valve is located in the pipeline connecting the exhaust gas treatment tank and the exhaust pipe and controls the flow of air in the pipeline. The power management system is signal-connected to the formaldehyde sensor, the methanol sensor, the exhaust gas treatment tank, and the control valve. The formaldehyde and methanol sensors transmit their collected measurements, including formaldehyde and methanol content, to the power management system. The power management system then controls the control valve based on the formaldehyde and methanol content to ensure that gases from the oxygen tank and high-pressure air tank enter the exhaust pipe at a predetermined ratio.

[0011] Because methanol in a methanol engine generates high temperatures during combustion, the formaldehyde and methanol in the exhaust react chemically with oxygen under these high-temperature conditions to produce carbon dioxide and water, thereby reducing the production and release of harmful gases. Simultaneously, oxygen reacts with other harmful gases in the exhaust, such as carbon monoxide and nitric oxide, to produce carbon dioxide and nitrogen dioxide, further reducing their production and release. The heat generated by these gas reactions helps reduce carbon deposits in the exhaust pipe and soot in the vehicle's muffler, thereby improving engine oil quality, reducing vehicle operating costs, and enhancing engine reliability.

[0012] The methanol engine emission control device of the present application can detect the exhaust gas content in real time during the operation of the methanol engine, and control the tail gas emissions according to the detection results, so that the engine can operate safely and reliably, which is conducive to reducing environmental pollution.

[0013] In some embodiments, the control device further includes a one-way valve, which is disposed on a pipeline connecting the exhaust gas treatment tank and the exhaust pipe, and is used to allow air flow from the exhaust gas treatment tank to flow to the exhaust pipe.

[0014] In some embodiments, the control device includes a first pipeline and a second pipeline, the oxygen tank is connected to the exhaust pipe through the first pipeline, and the high-pressure air tank is connected to the exhaust pipe through the second pipeline;

[0015] The control valve includes a first control valve and a second control valve. The first control valve is arranged on the first pipeline and is used to control the on-off of the oxygen flow in the first pipeline; the second control valve is arranged on the second pipeline and is used to control the on-off of the high-pressure air flow in the second pipeline.

[0016] In some embodiments, a first one-way valve is provided on the first pipeline for allowing air flow from the oxygen tank to flow to the exhaust pipe; a second one-way valve is provided on the second pipeline for allowing air flow from the high-pressure air tank to flow to the exhaust pipe.

[0017] In some embodiments, the control device further includes a display, and the display is signal-connected to the power management system.

[0018] In some embodiments, the control device further comprises a signal indicator light, wherein the signal indicator light is signal-connected to the power management system;

[0019] The signal indicator light includes three working states. When the signal indicator light is in a first working state, the signal indicator light displays a first color; when the signal indicator light is in a second working state, the signal indicator light displays a second color; when the signal indicator light is in a third working state, the signal indicator light displays a third color.

[0020] In some embodiments, the control device also includes an alarm, which is signal-connected to the power management system and is used to issue an alarm when the formaldehyde content and methanol content in the exhaust gas detected by the formaldehyde sensor and the methanol sensor are greater than or equal to a preset value.

[0021] In some embodiments, the control valve is a solenoid valve.

[0022] In a second aspect, the present application provides an engine, comprising a methanol engine emission control device as described in the first aspect, wherein the power management system is further used to limit the engine torque output when the formaldehyde content and methanol content in the exhaust gas detected by the formaldehyde sensor and the methanol sensor are greater than preset values.

[0023] In a third aspect, the present application provides a vehicle comprising the engine as described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a methanol engine emission control device provided in an embodiment of the present application;

[0025] Figure 2 A schematic structural diagram of another methanol engine emission control device provided in an embodiment of the present application;

[0026] Icons: 1. Formaldehyde sensor; 2. Methanol sensor; 3. Power management system; 4. Exhaust treatment tank; 41. Oxygen tank; 42. High-pressure air tank; 5. Control valve; 51. First control valve; 52. Second control valve; 6. Exhaust pipe; 7. One-way valve; 71. First one-way valve; 72. Second one-way valve; 8. First pipeline; 9. Second pipeline; 10. Display. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

[0029] In a methanol engine, in a special working environment and under severe working conditions, incomplete fuel combustion will cause exhaust gas to exceed the standard. During the operation of the vehicle, gas leakage may cause environmental pollution, ecological damage and explosion of the whole vehicle, which will eventually affect the emission performance and safety of the whole vehicle and reduce reliability. Based on the above problems, the embodiments of the present application provide a methanol engine emission control device, engine, and vehicle, which can realize exhaust gas detection and early warning, improve the safety and reliability of the whole machine operation, protect the driver, indirectly increase the engine life, reduce unnecessary economic losses, and meet development needs. At the same time, it can reduce the impact of toxic gases generated by the engine on the atmosphere and the damage to air quality and the ecological environment.

[0030] First, as Figure 1 and Figure 2 As shown, the embodiment of the present application provides a methanol engine emission control device, including a formaldehyde sensor 1, a methanol sensor 2, a power management system 3, an exhaust gas treatment tank 4 and a control valve 5;

[0031] The formaldehyde sensor 1 and the methanol sensor 2 are both arranged in the exhaust pipe 6 of the engine, and are used to detect the formaldehyde content and the methanol content in the exhaust gas of the engine;

[0032] The tail gas treatment tank 4 is connected to the exhaust pipe 6;

[0033] The control valve 5 is arranged on the pipeline connecting the exhaust gas treatment tank 4 and the exhaust pipe 6;

[0034] The power management system 3 is signal-connected to the formaldehyde sensor 1, the methanol sensor 2, the exhaust gas treatment tank 4 and the control valve 5. The exhaust gas treatment tank 4 includes an oxygen tank 41 and a high-pressure air tank 42. The power management system 3 is used to control the control valve 5 according to the formaldehyde content and methanol content detected by the formaldehyde sensor 1 and the methanol sensor 2, so that the gas in the oxygen tank 41 and the high-pressure air tank 42 enters the exhaust pipe 6 according to a preset ratio.

[0035] The above-mentioned methanol engine emission control device includes a formaldehyde sensor 1 and a methanol sensor 2. Both the formaldehyde sensor 1 and the methanol sensor 2 are installed in the exhaust pipe 6 of the engine and are used to detect the formaldehyde content and methanol content in the engine exhaust gas in real time. Because formaldehyde and methanol gases can also cause damage to the environment, this application also implements emission control of the exhaust gas. The methanol engine emission control device of this application also includes a power management system 3, an exhaust gas treatment gas tank 4 and a control valve 5. Among them, the exhaust gas treatment gas tank 4 is connected to the exhaust pipe 6, and the exhaust gas treatment gas tank 4 includes an oxygen tank 41 and a high-pressure air tank 42. The control valve 5 is arranged on the pipeline connecting the exhaust gas treatment gas tank 4 and the exhaust pipe 6, and is used to control the on-off of the airflow in the pipeline. The power management system 3 is signal-connected to the formaldehyde sensor 1, the methanol sensor 2, the exhaust gas treatment gas tank 4 and the control valve 5. Formaldehyde sensor 1 and methanol sensor 2 transmit collected measurement values ​​to power management system 3. The measurement values ​​include formaldehyde content and methanol content, such as formaldehyde and methanol concentrations. Power management system 3 controls control valve 5 based on the formaldehyde and methanol content to allow the gases in oxygen tank 41 and high-pressure air tank 42 to enter exhaust pipe 6 in a preset ratio. High-pressure air can improve the balance and stability of operation.

[0036] It should be noted that the preset ratio can have two meanings: First, the power management system 3 can control the amount of oxygen and high-pressure air entering the exhaust pipe 6 by adjusting the opening of the control valve 5 to ensure that the amount of exhaust gas to be treated is met. Second, the power management system 3 can also control the opening of the oxygen tank 41 and the high-pressure air tank 42 to ensure that the oxygen and high-pressure air flow out in a certain ratio.

[0037] Because methanol in a methanol engine generates high temperatures during combustion, the formaldehyde and methanol in the exhaust react chemically with oxygen under these high-temperature conditions to produce carbon dioxide and water, thereby reducing the production and release of harmful gases. Simultaneously, oxygen reacts with other harmful gases in the exhaust, such as carbon monoxide and nitric oxide, to produce carbon dioxide and nitrogen dioxide, further reducing their production and release. The heat generated by these gas reactions helps reduce carbon deposits in the exhaust pipe and soot in the vehicle's muffler, thereby improving engine oil quality, reducing vehicle operating costs, and enhancing engine reliability.

[0038] The chemical reactions of formaldehyde, methanol, and high-purity oxygen at high temperatures are: 2CH3OH + 3O2 → 2CO2 + 4H2O, HCHO + O2 → CO2 + H2O, CO + O2 → CO2, and NO + O2 → NO2. When exhaust gas anomalies are detected, the Power Management System 3 automatically identifies and processes the harmful gases, reducing pollutant emissions.

[0039] The methanol engine emission control device of the present application can detect the exhaust gas content in real time during the operation of the methanol engine, and control the tail gas emissions according to the detection results, so that the engine can operate safely and reliably, which is conducive to reducing environmental pollution.

[0040] It should be noted that the power management system 3 of the embodiment of the present application can be an electronic control unit (ECU). The formaldehyde sensor 1 contains an electrolyte, a working electrode, and a counting electrode. After the formaldehyde gas enters the sensor through a specific filter membrane, an oxidation-reduction reaction occurs in the electrolyte, generating a current signal. The higher the formaldehyde concentration, the stronger the electrical signal generated. The concentration of formaldehyde can be determined by measuring the strength of the electrical signal. Its advantages are high sensitivity and relatively good selectivity, and it can detect the formaldehyde concentration more accurately. For example, the Shengsrui SFA30 sensor module has precise formaldehyde sensing performance. The core component of the methanol sensor 2 is a semiconductor material. When methanol gas contacts the semiconductor surface, it causes the resistance value of the semiconductor to change. Using this resistance change to detect the concentration of methanol gas has the advantages of low cost, small size, and easy integration. It is suitable for large-scale application in methanol gas detection systems in vehicles to reduce the cost of the entire vehicle.

[0041] In some embodiments, the control device further includes a one-way valve 7, which is disposed on a pipeline connecting the exhaust gas treatment tank 4 and the exhaust pipe 6, and is configured to allow air to flow from the exhaust gas treatment tank 4 to the exhaust pipe 6. The provision of the one-way valve 7 can prevent harmful exhaust gas from flowing into the exhaust gas treatment tank 4.

[0042] In some embodiments, the control device includes a first pipeline 8 and a second pipeline 9, the oxygen tank 41 is connected to the exhaust pipe 6 through the first pipeline 8, and the high-pressure air tank 42 is connected to the exhaust pipe 6 through the second pipeline 9;

[0043] The control valve 5 includes a first control valve 51 and a second control valve 52. The first control valve 51 is arranged on the first pipeline 8 and is used to control the on-off of the oxygen flow in the first pipeline 8; the second control valve 52 is arranged on the second pipeline 9 and is used to control the on-off of the high-pressure air flow in the second pipeline 9.

[0044] One possible implementation method is Figure 2 As shown, to facilitate control of the flow of oxygen and high-pressure air into exhaust pipe 6, the methanol engine emission control device of the present embodiment can be provided with two pipelines: a first pipeline 8 for allowing oxygen from oxygen tank 41 to flow into exhaust pipe 6, and a second pipeline 9 for allowing high-pressure air from high-pressure air tank 42 to flow into exhaust pipe 6. A first control valve 51 and a second control valve 52 are respectively provided on first pipeline 8 and second pipeline 9 for controlling the flow of oxygen and high-pressure air, respectively. This arrangement facilitates control of the flow of oxygen and high-pressure air based on the measured values ​​of formaldehyde sensor 1 and methanol sensor 2, and facilitates operation.

[0045] In some embodiments, a first one-way valve 71 is provided on the first pipeline 8 to allow air flow from the oxygen tank 41 to the exhaust pipe 6; a second one-way valve 72 is provided on the second pipeline 9 to allow air flow from the high-pressure air tank 42 to the exhaust pipe 6. Similarly, the provision of the first one-way valve 71 and the second one-way valve 72 can prevent harmful exhaust gas from flowing into the oxygen tank 41 and the high-pressure air tank 42.

[0046] In some embodiments, the control device further includes a display 10 , which is signal-connected to the power management system 3 .

[0047] One possible implementation method is Figure 1 and Figure 2 As shown, the methanol engine emission control device of the embodiment of the present application further includes a display 10, which is signal-connected to the power management system 3. The display 10 can display the measurement values ​​of the formaldehyde sensor 1 and the methanol sensor 2 in real time, facilitating accurate control of the engine's operating status and enabling timely maintenance in the event of special circumstances.

[0048] In some embodiments, the control device further includes a signal indicator light (not shown in the figure), which is signal-connected to the power management system 3;

[0049] The signal indicator light includes three working states. When the signal indicator light is in the first working state, the signal indicator light displays a first color; when the signal indicator light is in the second working state, the signal indicator light displays a second color; when the signal indicator light is in the third working state, the signal indicator light displays a third color.

[0050] In one possible implementation, the methanol engine emission control device of the present embodiment further includes a signal indicator (not shown). The signal indicator is connected to the power management system 3 and can display different colors based on the measurement results of the formaldehyde sensor 1 and the methanol sensor 2. For example, when the formaldehyde and methanol content in the exhaust gas detected by the formaldehyde sensor 1 and the methanol sensor 2 are less than preset values, the signal indicator is in a first operating state, in which the signal indicator lights up green, indicating that the engine combustion is normal. When the formaldehyde and methanol content in the exhaust gas detected by the formaldehyde sensor 1 and the methanol sensor 2 are equal to the preset values, the signal indicator is in a second operating state, in which the signal indicator lights up yellow, indicating an abnormal engine condition, prompting the driver to visit a service station for repair as soon as possible. When the formaldehyde and methanol content in the exhaust gas detected by the formaldehyde sensor 1 and the methanol sensor 2 are greater than the preset values, the signal indicator is in a third operating state, in which the signal indicator lights up red, indicating that there is a serious risk to engine operation, and the power management system 3 will then limit the engine torque output. By using the measurement data of formaldehyde sensor 1 and methanol sensor 2, the working combustion status of the engine during dynamic operation is calculated and displayed through signal indicator lights, making it easy for the driver to confirm the engine operating status, which is beneficial to improving the safety of engine operation.

[0051] It should be noted that the preset values ​​in the embodiments of this application are determined as follows: With the engine in a normal state, universal test data is collected on a test bench to measure engine exhaust gas data. Based on the universal test data, the engine state data at this point serves as a baseline zero point. A deteriorated combustion test is then conducted, and the values ​​at each load point are determined based on the universal test data. The test is terminated until the engine fails to meet the test requirements. The data at this point, which does not meet the requirements, is then defined as the full-scale value of the measurement range, i.e., the preset values ​​in the embodiments of this application.

[0052] A MAP chart is drawn based on the zero-point value and full-scale value of the engine's operating status. When the engine's dynamic measurement value is equal to the full-scale value of the measured pressure difference range, an early warning is issued to remind the driver that maintenance is required. At this time, the ECU does not limit the engine torque output. If the driver does not perform maintenance inspections, the difference between the two ends of the engine during dynamic operation will seriously exceed the full-scale value range. At this time, the ECU's on-board diagnostic system (OBD) limits the engine torque output, and the driver needs to go to a service station for maintenance immediately to prevent greater damage caused by not taking measures when engine problems occur, thereby better protecting the safe operation of the engine and the rights of customers.

[0053] In some embodiments, the control device further includes an alarm (not shown), which is signal-connected to the power management system 3 and is configured to issue an alarm when the formaldehyde and methanol content in the exhaust gas detected by the formaldehyde sensor 1 and the methanol sensor 2 are greater than or equal to preset values. The alarm can be used to remind the driver to take appropriate action if they are not paying attention to the signal indicator light and display 10, thereby improving safety.

[0054] In some embodiments, the control valve 5 is a solenoid valve. It is understood that the control valve 5 can also be other valves that control the flow of gas, and there is no specific limitation.

[0055] In a second aspect, embodiments of the present application provide an engine comprising the methanol engine emission control device of the first aspect, wherein the power management system is further configured to limit engine torque output when the formaldehyde and methanol contents in the exhaust gas detected by the formaldehyde sensor and the methanol sensor are greater than preset values. Because the engine includes all the technical features of the methanol engine emission control device, it also includes all the beneficial effects of the methanol engine emission control device, which will not be further elaborated here.

[0056] In a third aspect, embodiments of the present application provide a vehicle comprising the engine of the second aspect. Because the vehicle comprises the engine, and the engine includes all the technical features of the methanol engine emission control device, the vehicle also includes all the beneficial effects of the methanol engine emission control device, which will not be further elaborated here.

[0057] In summary, the methanol engine emission control device of the present application can perform gas detection without disassembling engine parts. As long as the measured value is detected, engine maintenance or early warning reminders can be performed. At the same time, the control device can effectively reduce the toxic gases emitted due to the special working state of the whole machine. The device adopts differential detection, dynamically detects the working state of the engine at all times, and reprocesses the engine exhaust to reduce the impact of the exhaust on the atmosphere and the damage to the air quality and ecological environment. When the measured value exceeds the preset value, early warning protection can be performed, which can not only improve the safety of the engine, but also improve the personal safety factor of the operator during the operation of the engine, avoid accidents, and improve the efficiency of safe operation.

[0058] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A methanol engine emission control device, characterized in that: It includes a formaldehyde sensor (1), a methanol sensor (2), a power management system (3), an exhaust gas treatment tank (4) and a control valve (5); The formaldehyde sensor (1) and the methanol sensor (2) are both arranged in the exhaust pipe (6) of the engine and are used to detect the formaldehyde content and the methanol content in the exhaust gas of the engine; The tail gas treatment tank (4) is connected to the exhaust pipe (6); The control valve (5) is arranged on a pipeline connecting the tail gas treatment tank (4) and the exhaust pipe (6); The power management system (3) is signal-connected to the formaldehyde sensor (1), the methanol sensor (2), the exhaust gas treatment tank (4), and the control valve (5); the exhaust gas treatment tank (4) includes an oxygen tank (41) and a high-pressure air tank (42); the power management system (3) is used to control the control valve (5) according to the formaldehyde content and methanol content detected by the formaldehyde sensor (1) and the methanol sensor (2), so that the gases in the oxygen tank (41) and the high-pressure air tank (42) enter the exhaust pipe (6) according to a preset ratio.

2. The control device according to claim 1, characterized in that The control device further comprises a one-way valve (7), which is arranged on a pipeline connecting the exhaust gas treatment tank (4) and the exhaust pipe (6) and is used to allow air flow from the exhaust gas treatment tank (4) to flow to the exhaust pipe (6).

3. The control device according to claim 1, characterized in that The control device comprises a first pipeline (8) and a second pipeline (9), the oxygen tank (41) is connected to the exhaust pipe (6) via the first pipeline (8), and the high-pressure air tank (42) is connected to the exhaust pipe (6) via the second pipeline (9); The control valve (5) comprises a first control valve (51) and a second control valve (52). The first control valve (51) is arranged on the first pipeline (8) and is used to control the on-off of the oxygen gas flow in the first pipeline (8); the second control valve (52) is arranged on the second pipeline (9) and is used to control the on-off of the high-pressure air flow in the second pipeline (9).

4. The control device according to claim 3, characterized in that The first pipeline (8) is provided with a first one-way valve (71) for allowing air flow from the oxygen tank (41) to flow to the exhaust pipe (6); the second pipeline (9) is provided with a second one-way valve (72) for allowing air flow from the high-pressure air tank (42) to flow to the exhaust pipe (6).

5. The control device according to claim 1, characterized in that The control device further comprises a display (10), and the display (10) is connected to the power management system (3) by signal.

6. The control device according to claim 1, characterized in that The control device further comprises a signal indicator light, which is connected to the power management system (3) by signal; The signal indicator light includes three working states. When the signal indicator light is in a first working state, the signal indicator light displays a first color; when the signal indicator light is in a second working state, the signal indicator light displays a second color; when the signal indicator light is in a third working state, the signal indicator light displays a third color.

7. The control device according to claim 1, characterized in that The control device further comprises an alarm, which is connected to the power management system (3) by signal and is used to issue an alarm when the formaldehyde content and methanol content in the exhaust gas detected by the formaldehyde sensor (1) and the methanol sensor (2) are greater than or equal to a preset value.

8. The control device according to claim 1, characterized in that The control valve is a solenoid valve.

9. An engine, characterized in that: The invention comprises a methanol engine emission control device as described in any one of claims 1 to 8, wherein the power management system (3) is further used to limit the engine torque output when the formaldehyde content and methanol content in the exhaust gas detected by the formaldehyde sensor (1) and the methanol sensor (2) are greater than preset values.

10. A vehicle, characterized in that: Comprising the engine of claim 9.

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