Device for reducing nitrogen oxide emission of engine and control method

Abstract

The invention relates to the technical field of engines, in particular to a device for reducing nitrogen oxide emission of an engine and a control method, and the device comprises an air inlet pipe, an air filter and a humidifying and cooling mechanism; the air inlet pipe is communicated with the air filter, the air filter is communicated with the humidifying and cooling mechanism through a first air pipe, the humidifying and cooling mechanism is connected with an air inlet main pipe through a corrugated rubber pipe, an air inlet control valve is arranged on the air inlet main pipe, and the air inlet main pipe is connected to an engine through an air inlet manifold. After air is filtered by the air filter, the air flows out of the first air pipe and enters the humidifying and cooling mechanism, and the air treated by the humidifying and cooling mechanism enters the air inlet header pipe and the air inlet manifold through the corrugated rubber pipe and finally enters the engine. The air inlet temperature can be reduced, so that the combustion temperature of the engine is reduced, generation of nitric oxide is reduced, and the purpose of reducing nitric oxide emission of the engine is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of engines, and particularly to a device and a control method for reducing nitrogen oxide emissions of an engine. Background Art

[0003] Traditional engine intake systems often only include basic components such as intake pipes and air filters, which are used to supply clean air to the engine. However, such traditional intake systems have limited effectiveness in reducing nitrogen oxide emissions. In recent years, although some advanced engine technologies, such as selective catalytic reduction (SCR) systems, consume a large amount of vehicle urea, increasing the usage cost and having problems such as urea crystallization blockage. In addition, simply improving engine combustion technology to reduce nitrogen oxide emissions has limited effectiveness and may affect the power performance and combustion efficiency of the engine.

[0004] Therefore, a new device and control method for reducing nitrogen oxide emissions of an engine are needed to effectively reduce nitrogen oxide emissions without affecting the performance of the engine. Summary of the Invention

[0005] The present invention provides a device and a control method for reducing nitrogen oxide emissions of an engine, which reduce nitrogen oxide emissions by reducing the intake air temperature and the combustion temperature.

[0006] In a first aspect, the technical solution of the present invention provides a device for reducing nitrogen oxide emissions of an engine, including an intake pipe, an air filter, and a humidifying and cooling mechanism; The intake pipe is communicated with the air filter, the air filter is communicated with the humidifying and cooling mechanism through a first air pipe, the humidifying and cooling mechanism is connected with an intake main pipe through a corrugated rubber pipe, an intake control valve is arranged on the intake main pipe, and the intake main pipe is connected to the engine through an intake manifold; After the air is filtered by the air filter, it flows out from the first air pipe and enters the humidifying and cooling mechanism. The air processed by the humidifying and cooling mechanism enters the intake main pipe and the intake manifold through the corrugated rubber pipe, and finally enters the engine.

[0007] As a preference of the technical solution of the present invention, the humidifying and cooling mechanism includes a water tank, the water tank is connected with an intake humidifying unit through a water supply pipe for supplying water to the intake humidifying unit; at the same time, the water tank is also connected with a gas-liquid separator through a return pipe; The front end of the intake humidifying unit is connected to the first air pipe behind the air filter, so that the filtered air can enter the humidifying and cooling mechanism; the rear end of the intake humidifying unit is connected to the gas-liquid separator, and the air after cooling and humidifying treatment enters the gas-liquid separator for water-vapor separation; the rear end of the gas-liquid separator is connected to the intake main pipe through a corrugated rubber pipe, and the air after separating the water vapor enters the engine intake system.

[0008] The water tank provides water source for the air intake humidification unit, and supplies water through the water supply pipe, enabling the atomizing nozzles to spray water mist into the air to achieve humidification and cooling. The return pipe returns the water separated by the air-water separator to the water tank, realizing the recycling of water resources and saving water resources. At the same time, the setting of the air-water separator can effectively remove the excess water vapor in the air, ensure that the humidity of the air entering the engine is moderate, and avoid affecting the normal combustion and performance of the engine due to excessive humidity.

[0009] As a preference of the technical solution of the present invention, the air intake humidification unit includes a plurality of atomizing nozzles communicated with the water supply pipe; the air-water separator is installed behind the atomizing nozzles.

[0010] The setting of a plurality of atomizing nozzles can increase the contact area between the water mist and the air, make the water evaporate more fully, thereby improving the effect of humidification and cooling, more effectively reducing the intake air temperature, and reducing the generation of nitrogen oxides. The air-water separator is installed behind the atomizing nozzles, which can timely separate the excess water vapor in the humidified air, ensure the air quality entering the engine, and avoid adverse effects on the engine performance caused by excessive moisture.

[0011] As a preference of the technical solution of the present invention, a temperature sensor and a humidity sensor are arranged on the pipeline connected to the output end of the air-water separator, a water supply regulating switch is arranged on the water supply pipe, and an air-water separation switch is also arranged on the air-water separator; The air-water separator switch controls the working state of the air-water separator.

[0012] The temperature sensor and the humidity sensor real-time monitor the temperature and humidity of the intake air, providing accurate data support for the intelligent controller. The water supply regulating switch can accurately control the water supply volume according to the instructions of the intelligent controller, realizing the adjustment of the degree of humidification and cooling. The air-water separation switch can control the working state of the air-water separator, turn on or off the air-water separator when needed, or adjust its working intensity, ensure that the temperature and humidity of the air entering the engine meet the requirements, and improve the operation efficiency and stability of the device.

[0013] As a preference of the technical solution of the present invention, the device further includes an intelligent controller, and the temperature sensor, the humidity sensor, the water supply regulating switch, the air-water separation switch and the intake air control valve are respectively connected to the intelligent controller. The intelligent controller, as the control core of the whole device, connects the temperature sensor, the humidity sensor, the water supply regulating switch, the air-water separation switch and the intake air control valve, realizing the centralized control and coordinated operation of each component. Through the analysis and processing of signals such as temperature and humidity, the intelligent controller can accurately control the working state of each component according to the actual operation situation of the engine, enable the device to adaptively adjust the working parameters, and improve the effect of reducing nitrogen oxide emissions and the operation performance of the engine.

[0014] Preferably, as a technical solution of the present invention, a temperature sensor is used to detect the intake air temperature and transmit a temperature signal to an intelligent controller; a humidity sensor is used to monitor the intake air humidity and transmit a humidity signal to the intelligent controller, and the intelligent controller controls the states of a water supply regulating switch, a gas-water separation switch, and an intake air control valve according to the received temperature and humidity signals.

[0015] Based on the signals transmitted by the temperature sensor and the humidity sensor, the intelligent controller can real-time monitor the temperature and humidity of the intake air and accurately control the states of the water supply regulating switch, the gas-water separation switch, and the intake air control valve accordingly. It can achieve precise adjustment of the temperature and humidity of the intake air, ensuring that the air entering the engine is always within an appropriate temperature and humidity range, which not only guarantees the combustion efficiency of the engine but also effectively reduces the emission of nitrogen oxides.

[0016] Preferably, as a technical solution of the present invention, the intelligent controller receives the engine operating condition information transmitted by the engine management system, and the engine operating conditions include engine speed, engine load, engine exhaust temperature, and in-cylinder temperature of the engine; The intelligent controller analyzes the received temperature, operating condition, and humidity signals and adjusts the water supply regulating switch and the gas-water separator switch.

[0017] The intelligent controller receives the engine operating condition information transmitted by the engine management system and conducts a comprehensive analysis in combination with the temperature and humidity signals, enabling a more comprehensive understanding of the engine's operating state. According to the actual operating conditions of the engine, it precisely adjusts the water supply regulating switch and the gas-water separator switch, enabling the device to better adapt to the engine's requirements under different operating conditions, further improving the effect of reducing nitrogen oxide emissions while ensuring the engine's power performance and stability.

[0018] Preferably, as a technical solution of the present invention, the intelligent controller dynamically adjusts the preset thresholds of the intake air temperature, in-cylinder temperature, and exhaust temperature based on the engine operating state parameters, and compares the real-time monitored intake air temperature, in-cylinder temperature, and exhaust temperature with the corresponding preset thresholds respectively; the preset thresholds include an upper limit threshold and a lower limit threshold; If any temperature exceeds the preset upper limit threshold, the controller turns on the water supply regulating switch, pumps the water in the water tank into the humidifying and cooling mechanism, and combines it with the air in the form of water mist particles through the atomizing nozzle. At the same time, the gas-water separator is started synchronously; When the intake air temperature, in-cylinder temperature, and exhaust temperature are all lower than the preset lower limit threshold, the controller turns off the water supply regulating switch. At the same time, the gas-water separator is turned off or the opening degree of the gas-water separation switch is adjusted to adjust the working intensity of the gas-water separator.

[0019] The intelligent controller dynamically adjusts the preset temperature threshold, and automatically controls the working states of the water supply regulating switch and the gas-water separator according to the comparison result between the real-time temperature and the threshold. It realizes the intelligent and adaptive control of the device, can effectively reduce the intake air temperature under different engine operating conditions and environmental conditions, avoid excessive humidification or too high heat load, and minimize the nitrogen oxide emissions while ensuring the engine combustion efficiency.

[0020] In a second aspect, the technical solution of the present invention further provides a control method for a device for reducing nitrogen oxide emissions of an engine, including the following steps: Control the intake air control valve to open, and the device for reducing nitrogen oxide emissions of the engine starts to work; The intelligent controller receives the engine condition information transmitted by the engine management system, and the engine conditions include engine speed, engine load, engine exhaust temperature, and in-cylinder temperature of the engine; The intelligent controller analyzes the received temperature, condition, and humidity signals, and adjusts the water supply regulating switch and the gas-water separator switch. By controlling the intake air control valve to open to start the device, the device can work in time when needed. The intelligent controller receives the engine condition information and analyzes and adjusts it in combination with the temperature and humidity signals, realizing the automatic operation of the device, which can adaptively adjust the working parameters according to the actual operation of the engine, effectively reduce the nitrogen oxide emissions of the engine, and improve the environmental protection performance of the vehicle.

[0021] As a preference of the technical solution of the present invention, the step that the intelligent controller analyzes the received temperature, condition, and humidity signals and adjusts the water supply regulating switch and the gas-water separator switch includes: The intelligent controller dynamically adjusts the preset thresholds of the intake air temperature, in-cylinder temperature, and exhaust temperature according to the engine operating state parameters, and compares the real-time monitored intake air temperature, in-cylinder temperature, and exhaust temperature with the corresponding preset thresholds respectively; the preset thresholds include an upper limit threshold and a lower limit threshold; If any temperature exceeds the preset upper limit threshold, the controller opens the water supply regulating switch, pumps out the water in the water tank and sends it into the humidification and cooling mechanism, combines with the air in the form of water mist particles through the atomizing nozzle, and at the same time, starts the gas-water separator to work synchronously; When the intake air temperature, in-cylinder temperature, and exhaust temperature are all lower than the preset lower limit threshold, the controller closes the water supply regulating switch, and at the same time, closes the gas-water separator or adjusts the opening degree of the gas-water separation switch to further adjust the working intensity of the gas-water separator.

[0022] The intelligent controller analyzes the temperature, working conditions, and humidity signals, and precisely adjusts the water supply regulating switch and the gas-water separator switch according to the preset thresholds. It realizes the intelligent control of the device, can automatically adjust the working states of humidification, cooling, and gas-water separation according to the operating state of the engine and the temperature and humidity of the intake air. On the premise of ensuring the normal operation of the engine and combustion efficiency, it effectively reduces nitrogen oxide emissions and improves the reliability and adaptability of the device.

[0023] As can be seen from the above technical solutions, the present application has the following advantages: Through the combination of the intake pipe, air filter, and humidification and cooling mechanism, a complete intake air treatment channel is formed. The air is first filtered by the filter to remove impurities and prevent the impurities from entering the engine and causing wear to it; then it is processed by the humidification and cooling mechanism, which can reduce the intake air temperature, lower the engine combustion temperature, thereby reducing the generation of nitrogen oxides and achieving the purpose of reducing nitrogen oxide emissions from the engine. Brief Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the present application, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is the overall schematic diagram of the intake system where the present device is located.

[0026] Figure 2 It is the internal schematic structural diagram of the humidification and cooling mechanism.

[0027] In the figure, 1 - intake pipe, 2 - air filter, 3 - humidification and cooling mechanism, 4 - corrugated hose, 5 - intake control valve, 6 - intake main pipe, 7 - atomizing nozzle, 8 - gas-water separator, 9 - temperature and humidity sensor, 10 - intelligent controller, 11 - water tank, 12 - water supply regulating switch, 13 - intake air humidification unit, 14 - gas-water separator switch, 15 - in-cylinder temperature and exhaust temperature signal. Detailed Description of the Embodiments

[0028] To make the application purpose, features, and advantages of the present application more obvious and understandable, the technical solutions protected by the present application will be clearly and completely described below by using specific embodiments and the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this patent.

[0029] Such as Figure 1As shown in the figure, an embodiment of the present invention provides a device for reducing nitrogen oxide emissions of an engine, which includes an intake pipe 1, an air filter 2, and a humidifying and cooling mechanism 3; The intake pipe 1 is communicated with the air filter 2, the air filter 2 is communicated with the humidifying and cooling mechanism 3 through a first air pipe, the humidifying and cooling mechanism 3 is connected with an intake main pipe 6 through a corrugated rubber pipe 4, an intake control valve 5 is arranged on the intake main pipe 6, and the intake main pipe 6 is connected to the engine through an intake manifold; After the air is filtered by the air filter 2, it flows out from the first air pipe and enters the humidifying and cooling mechanism 3. The air processed by the humidifying and cooling mechanism 3 enters the intake main pipe and the intake manifold through the corrugated rubber pipe 4, and finally enters the engine.

[0030] In an embodiment of the present invention, the intake pipe is used to guide external air into the device; the air filter is communicated with the intake pipe and is used to filter the incoming air; the humidifying and cooling mechanism is communicated with the air filter through a first air pipe and is used to humidify and cool the filtered air; the humidifying and cooling mechanism is connected with an intake main pipe through a corrugated rubber pipe, the intake main pipe receives the humidified and cooled air through the corrugated rubber pipe, and an intake control valve for adjusting the air flow is arranged on the intake main pipe; the intake main pipe is connected with an intake manifold and is used to distribute the air to each cylinder of the engine.

[0031] In actual manufacturing, the intake pipe is made of wear-resistant and corrosion-resistant metal or engineering plastic materials to ensure that it can withstand a certain pressure and has a long service life. The air filter uses an efficient filtering material, such as a paper filter element or a fiber filter element, which can effectively filter impurities in the air. The humidifying and cooling mechanism 3 can be designed as an independent box body, and connection interfaces with the first air pipe and the corrugated rubber pipe are reserved inside. The intake pipe and the air filter are communicated by means of threaded connection or flange connection, and the air filter is connected with the humidifying and cooling mechanism through the first air pipe, and a connection method with good sealing performance can also be adopted. The humidifying and cooling mechanism is connected with the intake main pipe through a corrugated rubber pipe, an intake control valve is installed on the intake main pipe, and the intake main pipe is then connected to the engine through the intake manifold, and all components are tightly connected to ensure smooth air flow. Here, the first air pipe is a clean air pipe.

[0032] In some embodiments, as Figure 2 shown, the humidifying and cooling mechanism 3 includes a water tank 11, the water tank 11 is connected with an intake humidifying unit 13 through a water supply pipe for supplying water to the intake humidifying unit 13; at the same time, the water tank 11 is also connected with a gas-water separator 8 through a return pipe; The front end of the intake air humidifying unit 13 is connected to the first air pipe behind the air filter 2, so that the filtered air can enter the humidifying and cooling mechanism; the rear end of the intake air humidifying unit 13 is connected to the air-water separator 8, and the air after cooling and humidifying treatment enters the air-water separator 8 for air-water separation; the rear end of the air-water separator 8 is connected to the intake main pipe 6 through the corrugated rubber pipe 4, and the air after separating the water vapor enters the engine intake system.

[0033] The water tank provides water source for the intake air humidifying unit, and supplies water through the water supply pipe, so that the atomizing nozzles can spray water mist into the air to achieve humidifying and cooling. The return pipe returns the water separated by the air-water separator to the water tank to realize the recycling of water resources and save water resources. At the same time, the setting of the air-water separator can effectively remove the excess water vapor in the air, ensure that the air entering the engine has a moderate humidity, and avoid affecting the normal combustion and performance of the engine due to too high humidity.

[0034] The water tank is made of plastic or metal with a certain volume and strength, and is internally provided with a water level sensor for monitoring the water level in the water tank. The water supply pipe and the return pipe are both made of water-resistant and high-pressure-resistant pipes, and are connected to the water tank, the intake air humidifying unit and the air-water separator by means of quick connectors or welding. The intake air humidifying unit can be designed as a cavity, and pipes communicating with the water supply pipe are arranged inside, and a plurality of atomizing nozzles are installed on the pipes. The air-water separator can adopt a centrifugal or filtering structure and is installed at a suitable position at the rear end of the intake air humidifying unit to ensure that the air can pass through smoothly.

[0035] In the embodiment of the present invention, the intake air humidifying unit 13 includes a plurality of atomizing nozzles 7 communicated with the water supply pipe; the air-water separator 8 is installed behind the atomizing nozzles 7.

[0036] The setting of a plurality of atomizing nozzles can increase the contact area between the water mist and the air, make the water evaporate more fully, thereby improving the humidifying and cooling effect, more effectively reducing the intake air temperature, and reducing the generation of nitrogen oxides. The air-water separator is installed behind the atomizing nozzles, which can timely separate the excess water vapor in the humidified air, ensure the air quality entering the engine, and avoid adverse effects of too much water on the engine performance.

[0037] The atomizing nozzles are selected as high-pressure atomizing nozzles, and their spraying angles and spray particle sizes can be selected according to actual needs. A plurality of atomizing nozzles are evenly arranged on the pipes in the intake air humidifying unit and communicated with the water supply pipe through the pipes to ensure that the water can be evenly sprayed into the air. The air-water separator selects products with appropriate specifications and types according to parameters such as air flow rate and moisture content, and is installed in the air flow channel behind the atomizing nozzles to ensure that the air can pass through smoothly and effective air-water separation can be carried out.

[0038] In an embodiment of the present invention, a temperature sensor and a humidity sensor are provided on the pipeline connected to the output end of the air-water separator. A water supply adjustment switch 12 is provided on the water supply pipe, and an air-water separation switch 14 is further provided on the air-water separator; The air-water separation switch 14 controls the working state of the air-water separator 8.

[0039] The temperature sensor and the humidity sensor monitor the temperature and humidity of the incoming air in real time, providing accurate data support for the intelligent controller. The water supply adjustment switch 12 can accurately control the water supply volume according to the instructions of the intelligent controller, realizing the adjustment of the humidification and cooling degree. The air-water separation switch 14 can control the working state of the air-water separator 8, turn on or off the air-water separator when needed, or adjust its working intensity, ensuring that the temperature and humidity of the air entering the engine meet the requirements, and improving the operation efficiency and stability of the device.

[0040] The temperature sensor and the humidity sensor are selected as products with high precision and fast response speed, and are installed on the pipeline connected to the output end of the air-water separator to ensure that the temperature and humidity of the incoming air can be accurately detected. The water supply adjustment switch can adopt an electric control valve or a solenoid valve, which is installed on the water supply pipe and connected to the intelligent controller through a control circuit. The air-water separation switch adopts an electric switch or a pneumatic switch, which is installed on the air-water separator and used to control the working state of the air-water separator.

[0041] In an embodiment of the present invention, the device further includes an intelligent controller 10, and the temperature sensor, the humidity sensor, the water supply adjustment switch, the air-water separation switch and the intake air control valve are respectively connected to the intelligent controller. As the control core of the entire device, the intelligent controller connects the temperature sensor, the humidity sensor, the water supply adjustment switch, the air-water separation switch and the intake air control valve, realizing the centralized control and coordinated operation of each component. By analyzing and processing signals such as temperature and humidity, the intelligent controller can accurately control the working state of each component according to the actual operating conditions of the engine, enabling the device to adaptively adjust the working parameters and improving the effect of reducing nitrogen oxide emissions and the operating performance of the engine.

[0042] In an embodiment of the present invention, the temperature sensor is used to detect the intake air temperature and transmit the temperature signal to the intelligent controller; the humidity sensor is used to monitor the intake air humidity and transmit the humidity signal to the intelligent controller, and the intelligent controller controls the states of the water supply adjustment switch, the air-water separation switch and the intake air control valve according to the received temperature and humidity signals.

[0043] The intelligent controller can select an industrial-grade microcontroller or a programmable logic controller (PLC), which has multiple input and output interfaces for connecting with temperature sensors, humidity sensors, water supply regulating switches, gas-water separation switches, and intake control valves. By writing corresponding control programs, intelligent control of each component can be achieved. Connect the signal output ends of the temperature sensor and the humidity sensor to the input interface of the intelligent controller, and connect the control ends of the water supply regulating switch, the gas-water separation switch, and the intake control valve to the output interface of the intelligent controller to ensure the accurate execution of signal transmission and control instructions.

[0044] Based on the signals transmitted by the temperature sensor and the humidity sensor, the intelligent controller can continuously monitor the temperature and humidity of the intake air and accurately control the states of the water supply regulating switch, the gas-water separation switch, and the intake control valve accordingly. It can achieve precise adjustment of the temperature and humidity of the intake air, keeping the air entering the engine within an appropriate temperature and humidity range all the time, which not only ensures the combustion efficiency of the engine but also effectively reduces the emissions of nitrogen oxides.

[0045] In the embodiment of the present invention, the intelligent controller receives the engine operating condition information transmitted by the engine management system, and the engine operating conditions include engine speed, engine load, engine exhaust temperature, and in-cylinder temperature of the engine. The intelligent controller analyzes the received temperature, operating condition, and humidity signals and adjusts the water supply regulating switch and the gas-water separator switch.

[0046] The intelligent controller receives the operating condition information transmitted by the engine management system and conducts comprehensive analysis in combination with the temperature and humidity signals, enabling a more comprehensive understanding of the engine's operating state. According to the actual operating conditions of the engine, it precisely adjusts the water supply regulating switch and the gas-water separator switch, enabling the device to better adapt to the needs of the engine under different operating conditions, further improving the effect of reducing nitrogen oxide emissions, and at the same time ensuring the power performance and stability of the engine.

[0047] The temperature sensor and the humidity sensor continuously monitor the temperature and humidity of the intake air and transmit the real-time signals to the intelligent controller. The signal processing module inside the intelligent controller processes the received temperature and humidity signals, such as amplification and filtering, and then analyzes them through the data analysis module. According to the analysis results, the control output module of the intelligent controller sends corresponding control instructions to the water supply regulating switch, the gas-water separation switch, and the intake control valve to adjust their working states. For example, when the temperature is too high, the intelligent controller controls the water supply regulating switch to increase the opening degree and increase the water injection volume; when the humidity is too high, it controls the gas-water separation switch to enhance the working intensity of the gas-water separator.

[0048] The intelligent controller is connected to the engine management system through a communication interface, and receives operating condition information such as engine speed, engine load, engine exhaust temperature, and in-cylinder temperature of the engine. A data processing model is established inside the intelligent controller, and the received temperature, operating condition, and humidity signals are input into this model for comprehensive analysis. According to the analysis results, the intelligent controller outputs corresponding control instructions to adjust the water supply regulating switch and the gas-water separator switch. For example, when the engine is running at high load and the intake air temperature is relatively high, the intelligent controller increases the opening degree of the water supply regulating switch and simultaneously enhances the working intensity of the gas-water separator.

[0049] In the embodiment of the present invention, the intelligent controller dynamically adjusts the preset thresholds of the intake air temperature, in-cylinder temperature, and exhaust temperature according to the engine operating state parameters, and compares the real-time monitored intake air temperature, in-cylinder temperature, and exhaust temperature with the corresponding preset thresholds respectively; the preset thresholds include an upper limit threshold and a lower limit threshold. If any temperature exceeds the preset upper limit threshold, the controller turns on the water supply regulating switch, pumps out the water in the water tank and sends it to the humidifying and cooling mechanism, and combines it with air in the form of water mist particles through the atomizing nozzle. At the same time, the gas-water separator is started synchronously. When the intake air temperature, in-cylinder temperature, and exhaust temperature are all lower than the preset lower limit threshold, the controller closes the water supply regulating switch. At the same time, the gas-water separator is closed or the opening degree of the gas-water separation switch is adjusted to further adjust the working intensity of the gas-water separator.

[0050] The intelligent controller dynamically adjusts the temperature preset thresholds, and automatically controls the working states of the water supply regulating switch and the gas-water separator according to the comparison results of the real-time temperature and the thresholds. It realizes the intelligent and adaptive control of the device, can effectively reduce the intake air temperature under different engine operating conditions and environmental conditions, avoid excessive humidification or too high heat load, and minimize the nitrogen oxide emissions while ensuring the engine combustion efficiency.

[0051] Inside the intelligent controller, there is a threshold range of the intake air temperature, in-cylinder temperature, and exhaust temperature preset according to different engine operating state parameters. During the operation of the device, the intelligent controller dynamically adjusts the preset thresholds according to the real-time received engine operating state parameters such as engine speed and load. The temperature sensors real-time monitor the intake air temperature, in-cylinder temperature, and exhaust temperature, and transmit the data to the intelligent controller. The intelligent controller compares the real-time temperature with the corresponding preset thresholds. When any temperature exceeds the preset upper limit threshold, the intelligent controller sends an opening instruction to the water supply regulating switch and starts the gas-water separator at the same time; when the intake air temperature, in-cylinder temperature, and exhaust temperature are all lower than the preset lower limit threshold, the intelligent controller closes the water supply regulating switch and closes the gas-water separator or adjusts its working intensity according to the actual situation.

[0052] In the embodiments of the present invention, the water tank serves as a water source storage container, storing water for humidification and cooling. The water tank is connected to the intake air humidification unit through a water supply pipe, providing necessary water resources for the subsequent water spraying and atomization process. The design of the water tank takes into account its capacity size to meet the water requirements of the engine under different working conditions. At the same time, a water level sensor can be equipped to issue an alarm when the water level is too low, reminding to replenish the water source. The clean air filtered by the air filter enters the intake air humidification unit through the first air pipe. The function of the air filter is to remove dust, impurities, etc. in the air, ensuring the purity of the air entering the humidification and cooling mechanism, and avoiding damage to subsequent components or affecting the humidification and cooling effect.

[0053] A water supply adjustment switch is provided on the water supply pipe, and this switch is controlled by the intelligent controller. The intelligent controller receives the engine working condition information (such as engine speed, engine load, engine exhaust temperature, in-cylinder temperature of the engine, etc.) transmitted from the temperature sensor, humidity sensor, and engine management system. When the intelligent controller analyzes and determines that humidification and cooling are required (for example, when it monitors that the intake air temperature, in-cylinder temperature, or exhaust temperature exceeds the preset upper threshold), it will turn on the water supply adjustment switch, allowing the water in the water tank to flow into the intake air humidification unit through the water supply pipe. The intake air humidification unit includes multiple atomizing nozzles communicated with the water supply pipe. When water flows into the atomizing nozzles, the atomizing nozzles atomize the water into tiny water mist particles. These tiny water mist particles have a large surface area and can fully contact the air entering the intake air humidification unit. Since water needs to absorb heat when changing from a liquid state to a gaseous state, the water mist will absorb the heat in the air during the evaporation process, thereby reducing the temperature of the air. The uniform arrangement of multiple atomizing nozzles can ensure that the water mist is evenly distributed in the air, improving the humidification and cooling effect.

[0054] The air after cooling and humidification treatment contains a certain amount of water vapor, and water-air separation needs to be carried out to avoid excessive moisture entering the engine and affecting its normal operation. The water-air separator is installed behind the atomizing nozzles. When the intelligent controller turns on the water supply adjustment switch to spray water, it will synchronously start the water-air separator. The water-air separator usually uses a centrifugal, filtration, or a combination of both methods for water-air separation. For a centrifugal water-air separator, when air enters, it will make a high-speed rotational movement inside. Due to the higher density of water than air, under the action of centrifugal force, water droplets will be thrown towards the inner wall of the separator and flow down along the inner wall to the bottom; for a filtration water-air separator, when air passes through the filter material, water droplets will be intercepted and adsorbed by the filter material, and the dry air will continue to flow through the filter layer. The separated water flows back to the water tank through the return pipe, realizing the recycling of water resources.

[0055] The intelligent controller dynamically adjusts the water supply regulating switch and the air-water separator switch according to the analysis results. For example, when it is monitored that the air temperature is still higher than the set value, the opening degree of the water supply regulating switch will be appropriately increased to increase the water spraying amount to further lower the temperature; when it is monitored that the air humidity is close to the appropriate range, the working intensity of the water-air separator will be adjusted to avoid excessive dehumidification. At the same time, the intelligent controller will also dynamically adjust the preset thresholds of the intake air temperature, the in-cylinder temperature, and the exhaust gas temperature according to the operating state parameters of the engine, ensuring that the humidification and cooling mechanism can be accurately adjusted according to the actual working conditions of the engine.

[0056] The embodiment of the present invention also provides a control method for a device for reducing nitrogen oxide emissions of an engine, including: S1: Control the intake air control valve to open, and the device for reducing nitrogen oxide emissions of the engine starts to work; S2: The intelligent controller receives the engine working condition information transmitted by the engine management system, and the engine working conditions include engine speed, engine load, engine exhaust gas temperature, and in-cylinder temperature of the engine; S3: The intelligent controller analyzes the received temperature, working condition, and humidity signals, and adjusts the water supply regulating switch and the air-water separator switch.

[0057] By controlling the intake air control valve to open to start the device, the device can work in time when needed. The intelligent controller receives the engine working condition information and analyzes and adjusts it in combination with the temperature and humidity signals, realizing the automatic operation of the device, being able to adaptively adjust the working parameters according to the actual operating conditions of the engine, effectively reducing the nitrogen oxide emissions of the engine, and improving the environmental protection performance of the vehicle.

[0058] When the vehicle starts or when it is necessary to reduce nitrogen oxide emissions, the operator sends an instruction to the intelligent controller through the vehicle control system or the control button on the device to control the intake air control valve to open. The intelligent controller establishes a connection with the engine management system through the communication interface and receives the working condition information such as engine speed, engine load, engine exhaust gas temperature, and in-cylinder temperature of the engine in real time. At the same time, the temperature sensor and the humidity sensor monitor the temperature and humidity of the intake air in real time and transmit the signals to the intelligent controller. The intelligent controller analyzes and processes the received temperature, working condition, and humidity signals, and adjusts the water supply regulating switch and the air-water separator switch according to the preset control strategy.

[0059] In an embodiment of the present invention, the steps of the intelligent controller analyzing the received temperature, working condition, and humidity signals and adjusting the water supply regulating switch and the air-water separator switch include: The intelligent controller dynamically adjusts the preset thresholds of the intake air temperature, in-cylinder temperature, and exhaust gas temperature according to the engine operating state parameters, and compares the real-time monitored intake air temperature, in-cylinder temperature, and exhaust gas temperature with the corresponding preset thresholds respectively; the preset thresholds include upper limit thresholds and lower limit thresholds; If any temperature exceeds the preset upper limit threshold, the controller turns on the water supply regulating switch, pumps out the water in the water tank and sends it into the humidifying and cooling mechanism, and combines it with the air in the form of water mist particles through the atomizing nozzle. At the same time, the gas-water separator is started synchronously; When the intake air temperature, in-cylinder temperature, and exhaust gas temperature are all lower than the preset lower limit threshold, the controller turns off the water supply regulating switch. At the same time, the gas-water separator is turned off or the opening degree of the gas-water separation switch is adjusted to adjust the working intensity of the gas-water separator.

[0060] The intelligent controller precisely adjusts the water supply regulating switch and the gas-water separator switch according to the preset thresholds through the analysis of temperature, working condition, and humidity signals. It realizes the intelligent control of the device, can automatically adjust the working states of humidifying and cooling and gas-water separation according to the engine operating state and the intake air temperature and humidity conditions, and effectively reduces nitrogen oxide emissions and improves the reliability and adaptability of the device on the premise of ensuring the normal operation and combustion efficiency of the engine.

[0061] The data analysis module inside the intelligent controller dynamically adjusts the preset thresholds of the intake air temperature, in-cylinder temperature, and exhaust gas temperature according to the received engine operating state parameters such as engine speed and load. The temperature sensors transmit the real-time monitored intake air temperature, in-cylinder temperature, and exhaust gas temperature to the intelligent controller, and the intelligent controller compares these real-time temperatures with the corresponding preset thresholds. If any temperature exceeds the preset upper limit threshold, the control output module of the intelligent controller sends an opening instruction to the water supply regulating switch and a starting instruction to the gas-water separation switch at the same time; when the intake air temperature, in-cylinder temperature, and exhaust gas temperature are all lower than the preset lower limit threshold, the intelligent controller sends a closing instruction to the water supply regulating switch and sends a closing or opening degree adjusting instruction to the gas-water separation switch according to the actual situation.

[0062] In another embodiment of the present invention, the intelligent controller analyzes the received temperature, working condition, and humidity signals, and adopts the method of fuzzy inference in the process of adjusting the water supply regulating switch and the gas-water separator switch. The specific process is as follows: Fuzzy rules are established. The intelligent controller respectively converts the accurate values of the obtained engine speed, engine load, temperature signal and humidity signal into the membership degrees of fuzzy sets. According to the membership degrees of the fuzzy sets and the fuzzy rule base, fuzzy inference is carried out to obtain the fuzzy set of the output variable; the fuzzy set of the output variable is converted into an accurate value, and the accurate value obtained by defuzzification is used as the control signal to drive the feed water regulating switch and the gas-water separator switch; the output variables include the opening degree of the feed water regulating switch and the state of the gas-water separator switch.

[0063] Here, the input variables include the engine speed n, the engine load L, the ambient temperature Tenv, and the ambient humidity Henv; the output variables include the opening degree Kw of the feed water regulating switch and the state Sws of the gas-water separator switch. It should be noted that the opening degree Kw of the feed water regulating switch is used to control the amount of water entering the humidification and cooling device, and its value range is usually 0-100%. The state Sws of the gas-water separator switch can be set to discrete values, such as 0 indicating off and 1 indicating on.

[0064] For the engine speed n, the fuzzy sets can be defined as "low", "medium", and "high". For example, the "low" speed range may be 0-1000 r / min, the "medium" speed range is 1000-2500 r / min, and the "high" speed range is above 2500 r / min.

[0065] For the engine load L, the fuzzy sets can be defined as "light", "medium", and "heavy". For example, the "light" load is 0-30%, the "medium" load is 30-70%, and the "heavy" load is 70-100%.

[0066] For the ambient temperature Tenv, the fuzzy sets are "cold", "warm", and "hot". Assume that the "cold" temperature range is -20-10 °C, the "warm" temperature range is 10-25 °C, and the "hot" temperature range is above 25 °C.

[0067] For the ambient humidity Henv, the fuzzy sets are "dry", "moderate", and "wet". For example, the "dry" humidity range is 0-30%, the "moderate" humidity range is 30-70%, and the "wet" humidity range is 70-100%.

[0068] Common membership functions include triangular, trapezoidal, Gaussian, etc. Taking the "low" fuzzy set of the engine speed as an example, if the triangular membership function is adopted, its expression is:

[0069] Where n1 and n2 are the boundary values of the "low" speed range, such as n1 = 0 and n2 = 1000. According to the input accurate value n, calculate its membership degree in each fuzzy set.

[0070] According to the membership degrees of the input variables and the fuzzy rule base, perform fuzzy inference to obtain the fuzzy set of the output variable. Taking the Mamdani inference method as an example, for each rule, calculate the membership degree of its premise condition, usually using the minimum operation (min). For example, for Rule 1, the membership degree of the premise condition is:

[0071] Then, according to the conclusion of the rule, obtain the fuzzy set of the output variable. For the "large" opening degree of the feed water regulating switch, its membership degree is μ rule1 The intersection with the "large" opening degree fuzzy set. Perform inference on all rules, and finally merge the output fuzzy sets of each rule, usually using the maximum operation (max).

[0072] Convert the fuzzy set of the output variable into an exact value. Taking the centroid method as an example, for the opening degree Kw of the feed water regulating switch, its exact value is calculated as follows:

[0073] where , which means within the value range of the opening degree of the feed water regulating switch , multiply each opening degree value by its corresponding membership degree and then perform integration. This is equivalent to performing a weighted sum of all possible opening degree values according to their membership degrees, reflecting the relative importance of different opening degrees in the fuzzy set. represents the membership degree within the same value range ， It is used to normalize the result of the numerator so that the calculated exact value is within the given opening degree value range. For the switch state Sws of the gas-water separator, its exact value (0 or 1) can be determined by the maximum membership degree method according to the membership degree of its fuzzy set.

[0074] Take the exact value obtained by defuzzification as the control signal to drive the feed water regulating switch and the gas-water separator switch. For example, convert the exact value of the opening degree Kw of the feed water regulating switch into the corresponding electrical signal to control the actual opening degree of the regulating switch; according to the exact value of the switch state Sws of the gas-water separator, control the opening or closing of the switch.

[0075] Continuously monitor parameters such as the engine speed, load, ambient temperature, and humidity, and repeat the above steps to continuously adjust the states of the feed water regulating switch and the gas-water separator switch according to the real-time working conditions to achieve adaptive adjustment. At the same time, the fuzzy rule base and membership function can be optimized and adjusted according to the actual operation effect to improve the accuracy and stability of the control.

[0076] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for reducing engine nitrogen oxide emissions, characterized in that: Including air intake pipe, air filter and humidification and cooling mechanism; The air intake pipe is connected to the air filter, the air filter is connected to the humidification and cooling mechanism through the first air pipe, the humidification and cooling mechanism is connected to the air intake manifold through the corrugated rubber hose, the air intake manifold is provided with an air intake control valve, and the air intake manifold is connected to the engine through the intake manifold; After being filtered by the air filter, the air enters the humidification and cooling mechanism through the first air pipe. The air after humidification and cooling flows into the intake manifold through the corrugated rubber hose and then enters the engine through the intake manifold, thereby reducing the nitrogen oxide emissions of the engine.

2. The device for reducing engine nitrogen oxide emissions according to claim 1, characterized in that: The humidification and cooling mechanism includes a water tank, which is connected to an air intake humidification unit through a water supply pipe, and is used to supply water to the air intake humidification unit; at the same time, the water tank is also connected to an air-water separator through a water return pipe; The front end of the air intake humidification unit is connected to the first air pipe after the air filter, so that the filtered air can enter the humidification and cooling mechanism; the rear end of the air intake humidification unit is connected to the air-water separator, and the air that has been cooled and humidified enters the air-water separator for water vapor separation; the rear end of the air-water separator is connected to the intake main pipe through a corrugated rubber hose, and the air after water vapor separation enters the engine intake system.

3. The device for reducing engine nitrogen oxide emissions according to claim 2, characterized in that: The air intake humidification unit comprises a plurality of atomizing nozzles connected with a water supply pipe; the air-water separator is installed behind the atomizing nozzles.

4. The device for reducing engine nitrogen oxide emissions according to claim 3, characterized in that: The pipeline connected to the output end of the gas-water separator is provided with a temperature sensor and a humidity sensor, the water supply pipe is provided with a water supply regulating switch, and the gas-water separator is also provided with a gas-water separation switch; The gas-water separator switch controls the working state of the gas-water separator.

5. The device for reducing engine nitrogen oxide emissions according to claim 4, characterized in that: The device also includes an intelligent controller, and the temperature sensor, humidity sensor, water supply regulating switch, air-water separation switch and air intake control valve are respectively connected to the intelligent controller.

6. The device for reducing engine nitrogen oxide emissions according to claim 5, characterized in that: The temperature sensor is used to detect the intake air temperature and transmit the temperature signal to the intelligent controller; the humidity sensor is used to monitor the intake air humidity and transmit the humidity signal to the intelligent controller. The intelligent controller controls the status of the water supply regulating switch, the air-water separation switch and the intake control valve according to the received temperature and humidity signals.

7. The device for reducing engine nitrogen oxide emissions according to claim 6, characterized in that: The intelligent controller receives engine operating condition information transmitted by the engine management system, wherein the engine operating condition includes engine speed, engine load, engine exhaust temperature, and engine cylinder temperature; The intelligent controller analyzes the received temperature, working condition and humidity signals, and adjusts the water supply regulating switch and the gas-water separator switch.

8. The device for reducing engine nitrogen oxide emissions according to claim 7, characterized in that: The intelligent controller dynamically adjusts the preset thresholds of intake air temperature, cylinder temperature and exhaust temperature according to the engine operating status parameters, and compares the real-time monitored intake air temperature, cylinder temperature and exhaust temperature with the corresponding preset thresholds respectively; The preset threshold includes an upper threshold and a lower threshold; If any temperature exceeds the preset upper threshold, the controller water supply adjustment switch is turned on, the water in the water tank is pumped out and sent to the humidification and cooling mechanism, and is combined with the air in the form of water mist particles through the atomizing nozzle. At the same time, the air-water separator is started synchronously; When the intake temperature, cylinder temperature and exhaust temperature are all lower than the preset lower limit threshold, the controller turns off the water supply regulating switch and at the same time, turns off the gas-water separator or adjusts the opening of the gas-water separation switch to adjust the working intensity of the gas-water separator.

9. A control method for a device for reducing engine nitrogen oxide emissions, characterized in that: include: The intake control valve is controlled to open, and the device for reducing the engine's nitrogen oxide emissions starts to work; The intelligent controller receives engine operating condition information transmitted by the engine management system, wherein the engine operating condition includes engine speed, engine load, engine exhaust temperature, and engine cylinder temperature; The intelligent controller analyzes the received temperature, working condition and humidity signals, and adjusts the water supply regulating switch and the gas-water separator switch.

10. The control method of the device for reducing engine nitrogen oxide emissions according to claim 9, characterized in that: The intelligent controller analyzes the received temperature, working condition and humidity signals, and the steps of adjusting the water supply regulating switch and the gas-water separator switch include: The intelligent controller dynamically adjusts the preset thresholds of the intake temperature, cylinder temperature and exhaust temperature according to the engine operating state parameters, and compares the real-time monitored intake temperature, cylinder temperature and exhaust temperature with the corresponding preset thresholds respectively; the preset thresholds include an upper threshold and a lower threshold; If any temperature exceeds the preset upper threshold, the controller water supply adjustment switch is turned on, the water in the water tank is pumped out and sent to the humidification and cooling mechanism, and is combined with the air in the form of water mist particles through the atomizing nozzle. At the same time, the air-water separator is started synchronously; When the intake temperature, cylinder temperature and exhaust temperature are all lower than the preset lower limit threshold, the controller turns off the water supply regulating switch and at the same time, turns off the gas-water separator or adjusts the opening of the gas-water separation switch to adjust the working intensity of the gas-water separator.

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