Hydrogen energy catalysis environment-friendly device for reducing pollutants discharged by electronic fuel injection engine

Abstract

The invention discloses a hydrogen energy catalysis environment-friendly device for reducing pollutants discharged by an electronic fuel injection engine. The hydrogen energy catalysis environment-friendly device comprises a hydrogen source, a hydrogen injection metering module, a hydrogen control module and a hydrogen nozzle. The hydrogen source is connected with the hydrogen nozzle through the hydrogen injection metering module, and the hydrogen control module is connected with the hydrogen injection metering module; and the hydrogen nozzle is arranged on an engine exhaust pipeline in front of the three-way catalyst. Hydrogen is sprayed into the automobile exhaust system from the front of the automobile three-way catalyst, the sprayed hydrogen and oxynitride exhausted by an engine are mixed and then flow to the three-way catalyst, the three-way catalyst improves the activity of the oxynitride and the hydrogen in the exhaust system, the oxynitride and the hydrogen react chemically to generate nitrogen and water, and the nitrogen and the water are sprayed into the automobile exhaust system. When the tail gas exhausted by the engine is measured, the emission amount of oxynitride is greatly reduced. According to the invention, the defect that the emission of harmful gases is increased while the lean burn technology saves energy is overcome, the environment can be protected, and the realization of the dual-carbon goal in China is assisted.

Description

Technical Field

[0001] The invention relates to the technical field of engine energy conservation and emission reduction, and in particular to a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines. Background Art

[0002] The current exhaust pollutant control technology of electronic fuel injection engines is based on air-fuel ratio control, using sensors such as air flow meters as reference signals to calculate the basic fuel injection amount of the engine, so that the air-fuel ratio of the engine is kept near the optimal air-fuel ratio of 14.7:1. Only when the air-fuel ratio is close to 14.7:1, the fuel economy / power performance and environmental performance of the engine can be in the best balance. When the air-fuel ratio of the engine is in a rich mixture state less than 14.7:1, such as an air-fuel ratio of 13.7:1, the engine fuel consumption increases, the hydrocarbons (HC) and carbon monoxide (CO) and particulate matter in the emission pollutants increase, and the nitrogen oxide (NO) emissions decrease; when the air-fuel ratio of the engine is in a lean mixture state greater than 14.7:1, such as an air-fuel ratio of 15.7:1, the engine fuel consumption decreases, the hydrocarbons (HC) and carbon monoxide (CO) and particulate matter in the emission pollutants decrease, and the nitrogen oxide (NO) emissions increase.

[0003] With the development of the times, internal combustion engine technology is also developing in a more environmentally friendly direction. Globally, lean combustion technology has become the key development direction of energy-saving and emission reduction technology for internal combustion engines. However, lean combustion technology will lead to a substantial increase in nitrogen oxides (NO) in engine exhaust pollutants. This restricts the application and development of lean combustion as an energy-saving and emission reduction technology. Therefore, how to control the emission of nitrogen oxides (NO) while developing lean combustion technology has become the main technical research direction of major automobile companies. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines. The device utilizes hydrogen to catalyze the emission of pollutants, thereby saving engine fuel consumption and reducing engine pollutant emissions, thereby achieving the environmental protection purpose of energy conservation and emission reduction.

[0005] The invention discloses a hydrogen catalytic environmental protection device for reducing pollutant emissions from an electronic fuel injection engine. The engine is connected to an engine control module, and an exhaust pipe of the engine is provided with a first three-way catalytic converter or two second three-way catalytic converters and a first three-way catalytic converter sequentially arranged along the exhaust direction; the hydrogen catalytic environmental protection device comprises: a hydrogen source, a hydrogen injection metering module, a hydrogen control module and a hydrogen nozzle;

[0006] The hydrogen source is connected to the hydrogen nozzle via the hydrogen injection metering module, and the hydrogen control module is connected to the hydrogen injection metering module;

[0007] The hydrogen nozzle is installed on the engine exhaust pipe before the first three-way catalyst, and is used to spray hydrogen into the engine exhaust pipe from the front of the first three-way catalyst; or, the hydrogen nozzle is installed on the engine exhaust pipe between the first three-way catalyst and the second three-way catalyst, and is used to spray hydrogen into the engine exhaust pipe from between the first three-way catalyst and the second three-way catalyst.

[0008] As a further improvement of the present invention, the hydrogen source is a hydrogen storage device or a hydrogen production module that produces hydrogen by electrolyzing water;

[0009] When the hydrogen source is a hydrogen production module, the hydrogen control module is also connected to the hydrogen production module to control the hydrogen production module to start or stop working.

[0010] As a further improvement of the present invention, the hydrogen catalytic environmental protection device is installed at a preset position of the vehicle, and the hydrogen control module is connected to the vehicle power supply.

[0011] As a further improvement of the present invention, it also includes: an oxygen sensor;

[0012] The oxygen sensor is installed on the exhaust pipe of the engine before the first three-way catalytic converter, or the oxygen sensor is installed on the exhaust pipe of the engine before the first three-way catalytic converter and the second three-way catalytic converter;

[0013] The oxygen sensor is connected to the engine control module, and the engine control module controls the engine to perform lean combustion based on sensing data of the oxygen sensor.

[0014] As a further improvement of the present invention, it also includes: a mixed gas regulating device;

[0015] The mixed gas regulating device is connected between the oxygen sensor and the engine control module, and is used to adjust the sensor data transmitted by the oxygen sensor to the engine control module, so as to control the engine to perform lean combustion.

[0016] As a further improvement of the present invention, the engine control module is connected to the hydrogen control module, the hydrogen injection metering module or the hydrogen nozzle, and is used to send a hydrogen injection amount instruction to the hydrogen control module, the hydrogen injection metering module or the hydrogen nozzle.

[0017] As a further improvement of the present invention, it also includes: a first nitrogen oxide sensor and a second nitrogen oxide sensor;

[0018] When a first three-way catalytic converter is provided, the first nitrogen oxide sensor is installed on the exhaust pipe before the first three-way catalytic converter, and the second nitrogen oxide sensor is installed on the exhaust pipe after the first three-way catalytic converter;

[0019] When two first three-way catalytic converters and second three-way catalytic converters are provided, the first nitrogen oxide sensor is installed on the exhaust pipe before the second three-way catalytic converter, and the second nitrogen oxide sensor is installed on the exhaust pipe after the first three-way catalytic converter.

[0020] As a further improvement of the present invention, the first nitrogen oxide sensor and the second nitrogen oxide sensor are connected to the hydrogen control module;

[0021] The first nitrogen oxide sensor obtains the original nitrogen oxide emissions of the engine, the hydrogen control module sends a hydrogen injection amount instruction that matches the engine nitrogen oxide emissions to the hydrogen injection metering module, the second nitrogen oxide sensor obtains the nitrogen oxide content signal after treatment by the three-way catalytic converter, and determines whether the treated nitrogen oxides are reduced to a preset target value. If not, the size of the hydrogen injection amount delivered to the hydrogen control module is adjusted accordingly to achieve a closed loop.

[0022] As a further improvement of the present invention, the first nitrogen oxide sensor and the second nitrogen oxide sensor are connected to the engine control module, and the engine control module is connected to the hydrogen control module, the hydrogen injection metering module or the hydrogen nozzle;

[0023] The first nitrogen oxide sensor obtains the original nitrogen oxide emission of the engine, and the engine control module sends a hydrogen injection amount instruction that matches the engine nitrogen oxide emission to the hydrogen control module, the hydrogen injection metering module or the hydrogen nozzle. The second nitrogen oxide sensor obtains the nitrogen oxide content signal after treatment by the three-way catalytic converter, and determines whether the treated nitrogen oxide is reduced to a preset target value. If it is not reduced to the preset target value, the size of the hydrogen injection amount delivered to the hydrogen control module, the hydrogen injection metering module or the hydrogen nozzle is adjusted accordingly to achieve a closed loop.

[0024] As a further improvement of the present invention, the engine is a lean-burn engine, and the hydrogen injection amount standard of the hydrogen nozzle is: at least 5 ml of hydrogen is required per minute for every 100 ppm concentration of nitrogen oxides.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention utilizes electrolysis of water to produce hydrogen or installs a hydrogen storage device, and sprays hydrogen into the exhaust system of the automobile from the front of the automobile three-way catalytic converter. The sprayed hydrogen mixes with the nitrogen oxides discharged by the engine and flows to the three-way catalytic converter. The three-way catalytic converter increases the activity of nitrogen oxides and hydrogen in the exhaust system. The two react chemically to generate nitrogen and water. At this time, the exhaust gas discharged by the engine is measured, and the emission of nitrogen oxides is greatly reduced. The present invention solves the drawback of increased harmful gas emissions while saving energy in lean combustion technology, can protect the environment, and help achieve my country's dual carbon goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a hydrogen catalytic environmental protection device for reducing pollutant emissions from an electronic fuel injection engine disclosed in the present invention;

[0028] Figure 2 This is a schematic diagram of the application of the hydrogen catalytic environmental protection device disclosed in Example 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the application of the hydrogen catalytic environmental protection device disclosed in Example 2 of the present invention;

[0030] Figure 4 This is a schematic diagram of the application of the hydrogen catalytic environmental protection device disclosed in Example 3 of the present invention;

[0031] Figure 5 This is a schematic diagram of the application of the hydrogen catalytic environmental protection device disclosed in Example 4 of the present invention;

[0032] Figure 6 This is a schematic diagram of the application of the hydrogen energy catalytic environmental protection device disclosed in Example 5 of the present invention;

[0033] Figure 7 This is a schematic diagram of the application of the hydrogen energy catalytic environmental protection device disclosed in Example 6 of the present invention;

[0034] Figure 8 This is a schematic diagram of the application of the hydrogen energy catalytic environmental protection device disclosed in Example 7 of the present invention;

[0035] Fig. 9 This is a schematic diagram of the application of the hydrogen energy catalytic environmental protection device disclosed in Example 8 of the present invention;

[0036] Fig.10 This is a schematic diagram of the application of the hydrogen catalytic environmental protection device disclosed in Example 9 of the present invention;

[0037] Fig.11 This is a schematic diagram of the application of the hydrogen energy catalytic environmental protection device disclosed in Example 10 of the present invention;

[0038] Fig.12This is a schematic diagram of the application of the hydrogen catalytic environmental protection device disclosed in Example 11 of the present invention;

[0039] Fig.13 This is a schematic diagram of the application of the hydrogen energy catalytic environmental protection device disclosed in Example 12 of the present invention.

[0040] In the figure:

[0041] 1. Hydrogen production module; 2. Hydrogen injection metering module; 3. Hydrogen control module; 4. Hydrogen nozzle; 5. Engine control module; 6. Engine; 7. Oxygen sensor; 8. First three-way catalytic converter; 9. Second three-way catalytic converter; 10. First nitrogen oxide sensor; 11. Second nitrogen oxide sensor; 12. Mixed gas adjustment device. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0043] The present invention is further described in detail below by taking the hydrogen production module as a hydrogen source as an example in conjunction with the accompanying drawings:

[0044] The inventor of the present invention has been engaged in the research of automobile pollutant emission control technology for many years. By reducing the engine fuel injection amount, a lean engine air-fuel ratio is obtained. Through detection, it is found that the engine fuel consumption and emitted pollutants (hydrocarbons, carbon monoxide and particulate matter) are greatly reduced, the carbon dioxide emissions are correspondingly reduced, and the nitrogen oxide emissions are significantly increased; under the above circumstances, through continuous experiments, it is found that hydrogen is a highly efficient reducing agent for nitrogen oxides, and the products are water and nitrogen.

[0045] For this reason, Figure 1As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing the emission of pollutants from an electronic fuel injection engine, comprising: a hydrogen production module 1, a hydrogen injection metering module 2, a hydrogen control module 3 and a hydrogen nozzle 4; the hydrogen production module 1 is connected to the hydrogen nozzle 4 through the hydrogen injection metering module 2, the hydrogen control module 3 is connected to the hydrogen production module 1 and the hydrogen injection metering module 2 to control the operation of the hydrogen production module 1 and the hydrogen injection metering module 2, and the hydrogen nozzle 4 is installed on the engine exhaust pipe before the three-way catalytic converter to spray hydrogen from the front of the automobile three-way catalytic converter into the automobile exhaust pipe, and the sprayed hydrogen and the nitrogen oxides discharged by the engine are mixed and flow to the three-way catalytic converter; the three-way catalytic converter increases the activity of nitrogen oxides and hydrogen in the exhaust system, and the two produce a chemical reaction to generate nitrogen and water. At this time, the exhaust gas discharged by the engine is measured, and the emission of nitrogen oxides is greatly reduced. The present invention solves the disadvantage of increased harmful gas emissions while saving energy in lean combustion technology, can protect the environment, and help achieve my country's dual carbon goals.

[0046] Embodiment 1:

[0047] like Figure 2 As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing the emission of pollutants from an electronic fuel injection engine, which can be installed on a vehicle using gasoline, methanol, or natural gas as fuel; it comprises: a hydrogen production module 1, a hydrogen injection metering module 2, a hydrogen control module 3, a hydrogen nozzle 4, an engine control module 5, an engine 6, an oxygen sensor 7, and a first three-way catalytic converter 8; wherein the engine 6 is connected to the engine control module 5, and the exhaust pipe of the engine 6 is provided with a first three-way catalytic converter 8; the hydrogen production module 1 is connected to the hydrogen nozzle 4 via the hydrogen injection metering module 2, and the hydrogen control module 3 is connected to the hydrogen production module 1. Module 1 is connected to the hydrogen injection metering module 2 to control the operation of the hydrogen production module 1 and the hydrogen injection metering module 2. The hydrogen nozzle 4 is installed on the engine exhaust pipe before the first three-way catalytic converter 8, and is used to spray hydrogen into the exhaust pipe of the engine from the front of the first three-way catalytic converter 8; the oxygen sensor 7 is installed on the engine exhaust pipe before the first three-way catalytic converter 8, and the oxygen sensor 7 is connected to the engine control module 5. Based on the sensor data of the oxygen sensor 7, the engine control module 5 adjusts the internal program to reduce the fuel injection amount and output a lean mixture to control the engine to perform lean combustion.

[0048] The assembly and use method of this embodiment includes:

[0049] (1) Install the hydrogen catalytic energy-saving and environmental protection device at a suitable location on the vehicle;

[0050] (2) Install the hydrogen nozzle 4 in front of the first three-way catalytic converter 8 of the automobile;

[0051] (3) Install the connecting pipeline from the hydrogen injection metering module 2 to the hydrogen nozzle 4;

[0052] (4) Connect the positive and negative electrodes of the power supply of the hydrogen control module 3 to the vehicle power supply;

[0053] (5) Starting the engine 6, the hydrogen production module 1 starts to work and produces hydrogen;

[0054] (6) The hydrogen control module 3 controls the hydrogen injection metering module 2 to inject a preset amount of hydrogen into the exhaust pipe of the vehicle through the connecting pipeline and the hydrogen nozzle 4; wherein, after a large number of experimental data, under different engine operating conditions, each 100ppm concentration of nitrogen oxides requires at least 5 ml of hydrogen per minute for reduction reaction, preferably 30-200 ml of hydrogen; further, before the vehicle is started, the hydrogen control module 3 has set the corresponding hydrogen injection amount and injection method in advance;

[0055] (7) The hydrogen is mixed with the engine exhaust gas in the exhaust pipe. Under the catalytic action of the first three-way catalytic converter 8, the hydrogen and the nitrogen oxides undergo a chemical reaction to generate water and nitrogen.

[0056] Embodiment 2:

[0057] like Figure 3 As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0058] Different from Example 1, this embodiment has a second three-way catalytic converter 9 and a first three-way catalytic converter 8 arranged in sequence along the exhaust direction on the exhaust pipe of the engine, and a hydrogen nozzle 4 is installed on the engine exhaust pipe between the first three-way catalytic converter 8 and the second three-way catalytic converter 9, and is used to spray hydrogen from between the first three-way catalytic converter 8 and the second three-way catalytic converter 9 into the exhaust pipe of the engine; the oxygen sensor 7 is installed on the engine exhaust pipe before the second three-way catalytic converter 9.

[0059] The assembly and use method of this embodiment includes:

[0060] (1) Install the hydrogen catalytic energy-saving and environmental protection device at a suitable location on the vehicle;

[0061] (2) The hydrogen nozzle 4 is installed in the engine exhaust pipe between the first three-way catalytic converter 8 and the second three-way catalytic converter 9 of the automobile;

[0062] (3) Install the connecting pipeline from the hydrogen injection metering module 2 to the hydrogen nozzle 4;

[0063] (4) Connect the positive and negative electrodes of the power supply of the hydrogen control module 3 to the vehicle power supply;

[0064] (5) Starting the engine 6, the hydrogen production module 1 starts to work and produces hydrogen;

[0065] (6) The hydrogen control module 3 controls the hydrogen injection metering module 2 to inject a preset amount of hydrogen into the exhaust pipe of the vehicle through the connecting pipeline and the hydrogen nozzle 4; wherein, after a large number of experimental data, under different engine operating conditions, each 100 ppm concentration of nitrogen oxides requires at least 5 ml of hydrogen per minute for reduction reaction; further, before the vehicle is started, the hydrogen control module 3 has already set the corresponding hydrogen injection amount and injection method in advance;

[0066] (7) The exhaust gas generated by the engine is first processed by the second three-way catalytic converter 9, and then mixed with the hydrogen injected by the hydrogen nozzle. Under the catalytic action of the first three-way catalytic converter 8, the hydrogen and nitrogen oxides undergo a chemical reaction to generate water and nitrogen.

[0067] Embodiment 3:

[0068] like Figure 4 As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0069] Different from Example 1, this embodiment also includes: a first nitrogen oxide sensor 10 and a second nitrogen oxide sensor 11; the first nitrogen oxide sensor 10 is installed on the exhaust pipe before the first three-way catalytic converter 8, and the second nitrogen oxide sensor 11 is installed on the exhaust pipe after the first three-way catalytic converter 8; the first nitrogen oxide sensor 10 and the second nitrogen oxide sensor 11 are connected to the hydrogen control module 3.

[0070] The assembly and use method of this embodiment includes:

[0071] (1) Install the hydrogen catalytic energy-saving and environmental protection device at a suitable location on the vehicle;

[0072] (2) Install the hydrogen nozzle 4 in front of the first three-way catalytic converter 8 of the automobile;

[0073] (3) Install the connecting pipeline from the hydrogen injection metering module 2 to the hydrogen nozzle 4;

[0074] (4) Adjusting the internal program of the engine control module 5 to reduce the amount of fuel injection and output a leaner mixture. At this time, the engine's fuel consumption and hydrocarbons, carbon monoxide and particulate matter are reduced, while nitrogen oxide emissions increase;

[0075] (5) A first nitrogen oxide sensor 10 is installed on the exhaust pipe between the engine and the first three-way catalytic converter 8, and a second nitrogen oxide sensor 11 is installed on the exhaust pipe behind the first three-way catalytic converter 8, both of which communicate with the hydrogen control module 3;

[0076] (6) Connect the positive and negative electrodes of the power supply of the hydrogen control module 3 to the vehicle power supply;

[0077] (7) Starting the engine 6, the hydrogen production module 1 starts to work and produces hydrogen;

[0078] (8) The hydrogen control module 3 obtains the original nitrogen oxide emission of the engine through the first nitrogen oxide sensor 10, and the hydrogen control module 3 sends a hydrogen injection amount instruction matching the engine nitrogen oxide emission to the hydrogen injection metering module 2 through the connection line; wherein, under different engine operating conditions, at least 5 ml of hydrogen is required per minute for each 100 ppm concentration of nitrogen oxides for reduction reaction;

[0079] (9) The hydrogen injection metering module 2 injects hydrogen into the exhaust pipe of the vehicle through the connecting pipeline and the hydrogen nozzle 4;

[0080] (10) The hydrogen gas mixes with the engine exhaust gas in the exhaust pipe and flows to the first three-way catalytic converter 8. Under the catalytic action of the first three-way catalytic converter 8, the hydrogen gas and the nitrogen oxides react chemically to generate water and nitrogen.

[0081] (11) The hydrogen control module 3 determines whether the nitrogen oxide content has been reduced to the target value based on the nitrogen oxide content signal fed back by the second nitrogen oxide sensor 11 installed on the exhaust pipe behind the three-way catalytic converter. If it has not been reduced to the preset target value, the hydrogen injection amount delivered to the hydrogen injection metering module 2 is adjusted accordingly, and the nitrogen oxide emission is accurately controlled through the above closed-loop feedback.

[0082] Embodiment 4:

[0083] like Figure 5 As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0084] Different from Example 3, this embodiment has a second three-way catalytic converter 9 and a first three-way catalytic converter 8 arranged in sequence along the exhaust direction on the exhaust pipe of the engine, and a hydrogen nozzle 4 is installed on the engine exhaust pipe between the first three-way catalytic converter 8 and the second three-way catalytic converter 9, and is used to spray hydrogen into the exhaust pipe of the engine from between the first three-way catalytic converter 8 and the second three-way catalytic converter 9; an oxygen sensor 7 and a first nitrogen oxide sensor 10 are installed on the engine exhaust pipe before the second three-way catalytic converter 9.

[0085] The method of use of this embodiment is basically the same as that of embodiment 3.

[0086] Embodiment 5:

[0087] like Figure 6As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0088] Different from the first embodiment, the engine control module 5 of this embodiment is connected to the hydrogen control module 3 and is used to send a hydrogen injection amount instruction to the hydrogen control module 3 .

[0089] The assembly and use method of this embodiment includes:

[0090] (1) Install the hydrogen catalytic energy-saving and environmental protection device at a suitable location on the vehicle;

[0091] (2) Install the hydrogen nozzle 4 in front of the first 8 three-way catalytic converter of the vehicle;

[0092] (3) Install the connecting pipeline from the hydrogen injection metering module 2 to the hydrogen nozzle 4;.

[0093] (4) Install the connection line from the hydrogen control module 3 to the engine control module 5;

[0094] (5) Adjusting the internal program of the engine control module 5 to reduce the amount of fuel injection and output a leaner mixture. At this time, the engine's fuel consumption and hydrocarbons, carbon monoxide and particulate matter are reduced, while nitrogen oxide emissions increase;

[0095] (6) Connect the positive and negative electrodes of the power supply of the hydrogen control module 3 to the vehicle power supply;

[0096] (7) Starting the engine 6, the hydrogen production module 1 starts to work and produces hydrogen;

[0097] (8) The engine control module 5 sends a hydrogen injection instruction to the hydrogen control module 3 through the connection line; wherein, under different engine operating conditions, at least 5 ml of hydrogen is required per minute for each 100 ppm concentration of nitrogen oxides for reduction reaction;

[0098] (9) The hydrogen control module 3 sends a hydrogen injection amount instruction to the hydrogen injection metering module 2, and the hydrogen injection metering module 2 injects hydrogen into the exhaust pipe of the vehicle through the connecting pipeline and the hydrogen nozzle 4;

[0099] (10) The hydrogen is mixed with the engine exhaust gas in the exhaust pipe and flows to the first three-way catalytic converter 8. Under the catalytic action of the first three-way catalytic converter 8, the hydrogen and the nitrogen oxides undergo a chemical reaction to generate water and nitrogen.

[0100] Embodiment 6:

[0101] like Figure 7As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0102] Different from the second embodiment, the engine control module 5 of this embodiment is connected to the hydrogen control module 3 and is used to send a hydrogen injection amount instruction to the hydrogen control module.

[0103] The method of use of this embodiment is basically the same as that of embodiment 5.

[0104] Embodiment 7:

[0105] like Figure 8 As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0106] Different from Embodiment 4, in this embodiment, the first nitrogen oxide sensor 10 and the second nitrogen oxide sensor 11 are connected to the engine control module 5 , and the engine control module 5 is connected to the hydrogen control module 3 .

[0107] The assembly and use method of this embodiment includes:

[0108] (1) Install the hydrogen catalytic energy-saving and environmental protection device at a suitable location on the vehicle;

[0109] (2) The hydrogen nozzle 4 is installed in the engine exhaust pipe between the first three-way catalytic converter 8 and the second three-way catalytic converter 9 of the automobile;

[0110] (3) Install the connecting pipeline from the hydrogen injection metering module 2 to the hydrogen nozzle 4;.

[0111] (4) Adjusting the internal program of the engine control module 5 to reduce the amount of fuel injection and output a leaner mixture. At this time, the engine's fuel consumption and hydrocarbons, carbon monoxide and particulate matter are reduced, while nitrogen oxide emissions increase;

[0112] (5) A first nitrogen oxide sensor 10 is installed on the exhaust pipe between the engine 6 and the second three-way catalytic converter 9, and a second nitrogen oxide sensor 11 is installed on the exhaust pipe behind the first three-way catalytic converter 8, both of which communicate with the engine control module 5;

[0113] (6) Connect the positive and negative electrodes of the power supply of the hydrogen control module 3 to the vehicle power supply;

[0114] (7) Starting the engine 6, the hydrogen production module 1 starts to work and produces hydrogen;

[0115] (8) The engine control module 5 obtains the original nitrogen oxide emission of the engine through the first nitrogen oxide sensor 10, and the engine control module 5 sends a hydrogen injection amount instruction matching the engine nitrogen oxide emission to the hydrogen control module 3 through the connection line; wherein, under different engine operating conditions, at least 5 ml of hydrogen is required per minute for each 100 ppm concentration of nitrogen oxides to undergo a reduction reaction;

[0116] (9) The hydrogen control module 3 controls the hydrogen injection metering module 2 to inject hydrogen into the exhaust pipe of the vehicle through the connecting pipeline and the hydrogen nozzle 4;

[0117] (10) The exhaust gas generated by the engine is first processed by the second three-way catalytic converter 9, and then mixed with the hydrogen injected by the hydrogen nozzle. Under the catalytic action of the first three-way catalytic converter 8, the hydrogen and the nitrogen oxides undergo a chemical reaction to generate water and nitrogen.

[0118] (11) The engine control module 5 determines whether the nitrogen oxide content has been reduced to the target value based on the nitrogen oxide content signal fed back by the second nitrogen oxide sensor 11 installed on the exhaust pipe behind the three-way catalytic converter. If it has not been reduced to the preset target value, the engine control module 5 adjusts the amount of hydrogen injection delivered to the hydrogen control module 3 accordingly, and accurately controls the nitrogen oxide emission through the above closed-loop feedback.

[0119] Embodiment 8:

[0120] like Fig. 9 As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0121] Different from the fourth embodiment, in this embodiment, the first nitrogen oxide sensor 10 and the second nitrogen oxide sensor 11 are connected to the engine control module 5 , and the engine control module 5 is connected to the hydrogen injection metering module 2 .

[0122] The method of use of this embodiment is basically the same as that of Embodiment 7, except that the engine control module 5 sends a hydrogen injection amount instruction that matches the engine nitrogen oxide emissions to the hydrogen injection metering module 2 through a connecting line; and the engine control module 5 determines whether the nitrogen oxides are reduced to the target value based on the nitrogen oxide content signal of the part fed back by the second nitrogen oxide sensor 11 installed on the exhaust pipe behind the three-way catalytic converter. If it is not reduced to the preset target value, the size of the hydrogen injection amount delivered to the hydrogen injection metering module 2 is adjusted accordingly, and the nitrogen oxide emissions are accurately controlled through the above-mentioned closed-loop feedback.

[0123] Embodiment 9:

[0124] like Fig.10As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0125] Different from the fourth embodiment, the first nitrogen oxide sensor 10 and the second nitrogen oxide sensor 11 are connected to the engine control module 5 in this embodiment, and the engine control module 5 is connected to the hydrogen nozzle 4 .

[0126] The method of use of this embodiment is basically the same as that of Embodiment 7; the difference is that the engine control module 5 sends a hydrogen injection amount instruction that matches the engine's nitrogen oxide emissions to the hydrogen nozzle 4 through a connecting line; and the engine control module 5 determines whether the nitrogen oxides are reduced to the target value based on the nitrogen oxide content signal of the part fed back by the second nitrogen oxide sensor 11 installed on the exhaust pipe behind the three-way catalytic converter. If it is not reduced to the preset target value, the size of the hydrogen injection amount delivered to the hydrogen nozzle 4 is adjusted accordingly, and the nitrogen oxide emissions are accurately controlled through the above-mentioned closed-loop feedback.

[0127] Embodiment 10:

[0128] like Fig.11 As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0129] Different from Example 7, this embodiment is provided with a mixture regulating device 12 between the oxygen sensor 7 and the engine control module 5. Without adjusting the internal program of the engine control module 5, the sensor data transmitted to the engine control module 5 by the oxygen sensor 7 is adjusted through the mixture regulating device 12, so that the engine control module 5 reduces the fuel injection amount based on the adjusted sensor data and outputs a lean mixture to control the engine to perform lean combustion.

[0130] The assembly and use methods of this embodiment are basically the same as those of Embodiment 7, except that in step (4), an engine external mixture adjustment device 12 is installed on the connection line between the oxygen sensor 7 and the engine control module 5, and the signal transmitted by the oxygen sensor 7 to the engine control module 5 is adjusted to reduce the fuel injection amount and output a leaner mixture. At this time, the engine's fuel consumption and hydrocarbons, carbon monoxide and particulate matter are reduced, while the nitrogen oxide emissions are increased.

[0131] Embodiment 11:

[0132] like Fig.12 As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0133] Different from Example 8, this embodiment is provided with a mixture regulating device 12 between the oxygen sensor 7 and the engine control module 5. Without adjusting the internal program of the engine control module 5, the sensor data transmitted to the engine control module 5 by the oxygen sensor 7 is adjusted through the mixture regulating device 12, so that the engine control module 5 reduces the fuel injection amount based on the adjusted sensor data and outputs a lean mixture to control the engine to perform lean combustion.

[0134] The assembly and use methods of this embodiment are basically the same as those of Embodiment 8, except that in step (4), an engine external mixture adjustment device 12 is installed on the connection line between the oxygen sensor 7 and the engine control module 5, and the signal transmitted by the oxygen sensor 7 to the engine control module 5 is adjusted to reduce the fuel injection amount and output a leaner mixture. At this time, the engine's fuel consumption and hydrocarbons, carbon monoxide and particulate matter are reduced, while the nitrogen oxide emissions are increased.

[0135] Embodiment 12:

[0136] like Fig.13 As shown, the present invention provides a hydrogen catalytic environmental protection device for reducing pollutant emissions from electronic fuel injection engines, which can be installed on vehicles using gasoline, methanol, or natural gas as fuel;

[0137] Different from Example 9, this embodiment is provided with a mixture regulating device 12 between the oxygen sensor 7 and the engine control module 5. Without adjusting the internal program of the engine control module 5, the sensor data transmitted to the engine control module 5 by the oxygen sensor 7 is adjusted through the mixture regulating device 12, so that the engine control module 5 reduces the fuel injection amount based on the adjusted sensor data and outputs a lean mixture to control the engine to perform lean combustion.

[0138] The assembly and use methods of this embodiment are basically the same as those of Embodiment 9, except that in step (4), an engine external mixture adjustment device 12 is installed on the connection line between the oxygen sensor 7 and the engine control module 5, and the signal transmitted by the oxygen sensor 7 to the engine control module 5 is adjusted to reduce the fuel injection amount and output a leaner mixture. At this time, the engine's fuel consumption and hydrocarbons, carbon monoxide and particulate matter are reduced, while the nitrogen oxide emissions are increased.

[0139] In order to verify the performance of the hydrogen catalytic environmental protection device of the present invention, the relevant emission reduction effect comparison data is shown in Table 1.

[0140] Table 1 Test model: Honda Fit Displacement: 1.5L Year: 2006 Emission standard: National III Mileage: 221527km

[0141]

[0142]

[0143] It can be seen from this that the present invention can reduce the content of pollutants such as nitrogen oxides and particulate matter in the exhaust gas after the engine has a lean air-fuel ratio and is equipped with a hydrogen energy environmental protection device.

[0144] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydrogen catalytic environmental protection device for reducing pollutant emissions from an electronic fuel injection engine, wherein the engine is connected to an engine control module, and an exhaust pipe of the engine is provided with a first three-way catalytic converter or two second three-way catalytic converters and a first three-way catalytic converter sequentially arranged along the exhaust direction; characterized in that: include: A hydrogen source, a hydrogen injection metering module, a hydrogen control module and a hydrogen nozzle; The hydrogen source is connected to the hydrogen nozzle via the hydrogen injection metering module, and the hydrogen control module is connected to the hydrogen injection metering module; The hydrogen nozzle is installed on the engine exhaust pipe before the first three-way catalyst, and is used to spray hydrogen into the engine exhaust pipe from the front of the first three-way catalyst; or, the hydrogen nozzle is installed on the engine exhaust pipe between the first three-way catalyst and the second three-way catalyst, and is used to spray hydrogen into the engine exhaust pipe from between the first three-way catalyst and the second three-way catalyst.

2. The hydrogen catalytic environmental protection device according to claim 1, characterized in that: The hydrogen source is a hydrogen storage device or a hydrogen production module that produces hydrogen by electrolyzing water; When the hydrogen source is a hydrogen production module, the hydrogen control module is also connected to the hydrogen production module to control the hydrogen production module to start or stop working.

3. The hydrogen catalytic environmental protection device according to claim 1, characterized in that: The hydrogen catalytic environmental protection device is installed at a preset position of the vehicle, and the hydrogen control module is connected to the vehicle power supply.

4. The hydrogen catalytic environmental protection device according to claim 1, characterized in that: Also includes: Oxygen sensor; The oxygen sensor is installed on the exhaust pipe of the engine before the first three-way catalytic converter, or the oxygen sensor is installed on the exhaust pipe of the engine before the first three-way catalytic converter and the second three-way catalytic converter; The oxygen sensor is connected to the engine control module, and the engine control module controls the engine to perform lean combustion based on sensing data of the oxygen sensor.

5. The hydrogen catalytic environmental protection device according to claim 4, characterized in that: Also includes: Mixed gas regulating device; The mixed gas regulating device is connected between the oxygen sensor and the engine control module, and is used to adjust the sensor data transmitted by the oxygen sensor to the engine control module, so as to control the engine to perform lean combustion.

6. The hydrogen catalytic environmental protection device according to any one of claims 1 to 5, characterized in that: The engine control module is connected to the hydrogen control module, the hydrogen injection metering module or the hydrogen nozzle, and is used to send a hydrogen injection amount instruction to the hydrogen control module, the hydrogen injection metering module or the hydrogen nozzle.

7. The hydrogen catalytic environmental protection device according to any one of claims 1 to 5, characterized in that: Also includes: a first nitrogen oxide sensor and a second nitrogen oxide sensor; When a first three-way catalytic converter is provided, the first nitrogen oxide sensor is installed on the exhaust pipe before the first three-way catalytic converter, and the second nitrogen oxide sensor is installed on the exhaust pipe after the first three-way catalytic converter; When two first three-way catalytic converters and second three-way catalytic converters are provided, the first nitrogen oxide sensor is installed on the exhaust pipe before the second three-way catalytic converter, and the second nitrogen oxide sensor is installed on the exhaust pipe after the first three-way catalytic converter.

8. The hydrogen catalytic environmental protection device according to claim 7, characterized in that: The first nitrogen oxide sensor and the second nitrogen oxide sensor are connected to the hydrogen control module; The first nitrogen oxide sensor obtains the original nitrogen oxide emissions of the engine, the hydrogen control module sends a hydrogen injection amount instruction that matches the engine nitrogen oxide emissions to the hydrogen injection metering module, the second nitrogen oxide sensor obtains the nitrogen oxide content signal after treatment by the three-way catalytic converter, and determines whether the treated nitrogen oxides are reduced to a preset target value. If not, the size of the hydrogen injection amount delivered to the hydrogen control module is adjusted accordingly to achieve a closed loop.

9. The hydrogen catalytic environmental protection device according to claim 7, characterized in that: The first nitrogen oxide sensor and the second nitrogen oxide sensor are connected to the engine control module, and the engine control module is connected to the hydrogen control module, the hydrogen injection metering module or the hydrogen nozzle; The first nitrogen oxide sensor obtains the original nitrogen oxide emission of the engine, and the engine control module sends a hydrogen injection amount instruction that matches the engine nitrogen oxide emission to the hydrogen control module, the hydrogen injection metering module or the hydrogen nozzle. The second nitrogen oxide sensor obtains the nitrogen oxide content signal after treatment by the three-way catalytic converter, and determines whether the treated nitrogen oxide is reduced to a preset target value. If it is not reduced to the preset target value, the size of the hydrogen injection amount delivered to the hydrogen control module, the hydrogen injection metering module or the hydrogen nozzle is adjusted accordingly to achieve a closed loop.

10. The hydrogen catalytic environmental protection device according to claim 1, characterized in that: The engine is a lean-burn engine, and the hydrogen injection amount standard of the hydrogen nozzle is: at least 5 ml of hydrogen is required per minute for every 100 ppm concentration of nitrogen oxides.

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