A pressure detection system, control method and vehicle for an EGR valve

Abstract

This invention provides a pressure detection system, control method, and vehicle for an EGR valve, relating to the field of vehicle technology. The EGR valve pressure detection system includes a pressure measuring device, a first air pipe, a second air pipe, and a cleaning device. The pressure measuring device includes an inner cavity and a detection unit disposed within the inner cavity. The inner cavity is connected to the inlet and outlet ends of the EGR valve via the first and second air pipes, respectively. The detection unit is used to detect the pressure in the first and second air pipes within the inner cavity. The cleaning device is connected to the inner cavity and is used to clean the inner cavity with gas. The beneficial effect of this invention is that it can reduce the margin in the EGR rate calibration, thereby improving engine thermal efficiency.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to an EGR valve pressure detection system, control method, and vehicle. Background Technology

[0002] To enhance market competitiveness and further reduce engine fuel consumption, improving vehicle engine thermal efficiency has become a trend. In pursuit of higher thermal efficiency, EGR (Exhaust Gas Recirculation) technology is widely used, requiring the measurement of the pressure difference across the EGR valve for accurate flow calculation and control.

[0003] To assess the impact of exhaust gas recirculation (EGR) on engine performance, the engine's EGR rate typically needs to be calibrated. However, in practical applications, the pressure sensors measuring the EGR valve may suffer from corrosion of the sensor sealant, contamination, and condensation that can lead to freezing in winter. This can result in significant measurement accuracy deviations. To ensure stable engine operation without misfires or other abnormal combustion issues, the EGR rate calibration must account for the accuracy deviations caused by pressure sensor contamination and aging. In this case, the EGR rate calibration usually allows for a large margin, which can affect the engine's thermal efficiency. Summary of the Invention

[0004] The problem addressed by this invention is how to reduce the margin of the EGR rate calibration in order to improve engine thermal efficiency.

[0005] To address the aforementioned problems, this invention provides a pressure detection system for an EGR valve, comprising: a pressure measuring device, a first air pipe, a second air pipe, and a cleaning device. The pressure measuring device includes an inner cavity and a detection unit disposed within the inner cavity. The inner cavity is connected to the inlet and outlet of the EGR valve via the first and second air pipes, respectively. The detection unit is used to detect the pressure of the first and second air pipes within the inner cavity. The cleaning device is connected to the inner cavity and is used to clean the inner cavity with gas.

[0006] The pressure detection system for the EGR valve in this invention connects a pressure measuring device with an internal cavity to the inlet and outlet of the EGR valve. This allows exhaust gas to enter the internal cavity of the pressure measuring device via a first air pipe before passing through the EGR valve, and again via a second air pipe after passing through the EGR valve. The pressure is detected by a sensor within the internal cavity, allowing for the determination of the pressure difference for EGR valve control. A cleaning device is installed to remove any remaining exhaust gas and potential water droplets from the internal cavity, mitigating contamination and icing of the pressure measuring device and ensuring it remains in a relatively clean environment. The cleanliness of the system ensures the accuracy of the pressure data detected by the sensor. Therefore, when setting the EGR rate, there is no need to consider the measurement deviation of the pressure measuring device, thus reducing the required EGR rate margin. Furthermore, because the cleaning device effectively cleans the pressure measuring device, including reducing or even preventing internal icing, it is better suited to different regional environments. This further avoids the need for a larger margin in vehicle manufacturing due to EGR rate considerations, facilitating standardized vehicle manufacturing, reducing overall costs, and enabling more precise engine control, thereby improving engine thermal efficiency.

[0007] Furthermore, the cleaning device includes a negative pressure device and an air filter, the negative pressure device and the air filter being respectively connected to the inner cavity.

[0008] Furthermore, the cleaning device also includes a first gas conduction component and a second gas conduction component. The negative pressure device is connected to the inner cavity through the first gas conduction component, and the air filter is connected to the inner cavity through the second gas conduction component. The second gas conduction component is used to ensure that the flow rate of the gas introduced into the inner cavity is less than the flow rate of the gas discharged through the first gas conduction component.

[0009] Furthermore, the first gas conduction assembly includes a third gas pipe, the second gas conduction assembly includes a fourth gas pipe, the two ends of the third gas pipe are respectively connected to the negative pressure device and the pressure measuring device, and the two ends of the fourth gas pipe are respectively connected to the air filter and the pressure measuring device.

[0010] The diameter of the fourth gas pipe is larger than that of the third gas pipe, and / or the first gas conduction assembly further includes a first gas valve, the second gas conduction assembly further includes a second gas valve, the first gas valve is located at the third gas pipe, and the second gas valve is located at the fourth gas pipe.

[0011] This invention also proposes a control method for an EGR valve pressure detection system, applied to the EGR valve pressure detection system described above. The control method for the EGR valve pressure detection system includes the following steps:

[0012] Acquire engine operating condition data;

[0013] The operating status of the cleaning device is determined based on the operating condition data.

[0014] The control method for the EGR valve pressure detection system in this invention is used to control the aforementioned EGR valve pressure detection system, and it has the same technical effect as the aforementioned EGR valve pressure detection system. Furthermore, during control, by acquiring engine operating condition data, precise control of the cleaning device is achieved, thereby enabling the cleaning device to better coordinate with vehicle operation when cleaning the pressure measuring device. For example, different cleaning intensities can be applied under different operating conditions, all achieving good cleaning results. This improves engine thermal efficiency while ensuring stable engine operation without misfires or other abnormal combustion problems.

[0015] Furthermore, the operating condition data includes engine load and engine speed; determining the operating status of the cleaning device based on the operating condition data includes the following steps:

[0016] The opening time and duration of the first and second air valves of the cleaning device are determined based on the engine load and the engine speed.

[0017] Furthermore, determining the opening time and duration of the first and second air valves of the cleaning device based on the engine speed and engine load includes the following steps:

[0018] When the engine load is in a preset medium-high load range, the opening time of the first air valve is determined to be the time when the engine speed is at a first preset speed, the opening duration of the second air valve is determined to be a first preset opening duration, and the opening duration of the first air valve is determined to be the sum of the first preset opening duration and the first preset interval duration, wherein the opening time of the second air valve is later than the opening time of the first air valve.

[0019] Furthermore, determining the opening time and duration of the first and second air valves of the cleaning device based on the engine speed and engine load also includes the following steps:

[0020] When the engine load is in a preset low load range, the opening time of the first air valve is determined to be the time when the engine speed is at a second preset speed, the opening duration of the second air valve is determined to be a second preset opening duration, and the opening duration of the first air valve is determined to be the sum of the second preset opening duration and the second preset interval duration, wherein the opening time of the second air valve is later than the opening time of the first air valve, the second preset interval duration is longer than the first preset interval duration, and the second preset opening duration is longer than the first preset opening duration.

[0021] Furthermore, the control method for the pressure detection system of the EGR valve also includes the following steps:

[0022] After cleaning the pressure measuring device with a cleaning device, the gas composition inside the pressure measuring device is obtained;

[0023] The EGR rate is adjusted according to the gas composition, and when the EGR rate reaches a preset EGR rate, a prompt instruction is generated to remind the user to maintain the cleaning device or pressure measuring device.

[0024] The present invention also proposes a vehicle including a pressure detection system for an EGR valve as described above, and / or including a memory and a processor, the memory for storing a computer program, the processor for implementing a control method for the pressure detection system for an EGR valve as described above when the computer program is executed.

[0025] The vehicle in this invention has similar technical effects to the pressure detection system of the EGR valve and the control method of the pressure detection system of the EGR valve described above, and will not be described in detail here. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the pressure detection system for the EGR valve described in an embodiment of the present invention. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the pressure detection system for the EGR valve described in an embodiment of the present invention. Figure 2 ;

[0028] Figure 3 The flow chart of the control method for the pressure detection system of the EGR valve described in this embodiment of the invention. Figure 1 ;

[0029] Figure 4 The flow chart of the control method for the pressure detection system of the EGR valve described in this embodiment of the invention. Figure 2 .

[0030] Explanation of reference numerals in the attached drawings: 1-Pressure measuring device; 2-First air pipe; 3-Second air pipe; 4-Cleaning device; 5-EGR valve; 8-ECU central control unit; 101-Inner cavity; 401-Negative pressure device; 402-Air filter; 403-First gas conduction assembly; 404-Second gas conduction assembly; 413-Third air pipe; 414-Fourth air pipe; 423-First air valve; 424-Second air valve. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various ways and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0032] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0033] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0034] Figure 1 and Figure 2 In the diagram, both hollow and solid arrows indicate the direction of gas flow. Specifically, hollow arrows also indicate the direction in which exhaust gas flows in.

[0035] Reference Figure 1As shown in the figure, an embodiment of the present invention proposes a pressure detection system for an EGR valve, comprising: a pressure measuring device 1, a first air pipe 2, a second air pipe 3, and a cleaning device 4. The pressure measuring device 1 includes an inner cavity 101 and a detection unit disposed in the inner cavity 101. The inner cavity 101 is used to communicate with the inlet end and outlet end of the EGR valve 5 through the first air pipe 2 and the second air pipe 3, respectively. The detection unit is used to detect the pressure of the first air pipe 2 and the second air pipe 3 in the inner cavity 101, respectively. The cleaning device 4 is communicated with the inner cavity 101 and is used to clean the inner cavity 101 with gas.

[0036] In this embodiment of the invention, a pressure measuring device 1 with an inner cavity 101 is connected to the inlet and outlet ends of the EGR valve 5, thereby enabling... Figure 1 The direction of the gas flow indicated by the hollow arrow, which is also the direction of the exhaust gas flow, enters the inner cavity of the pressure measuring device 1 through the first gas pipe 2 before passing through the EGR valve 5, and enters the inner cavity 101 of the pressure measuring device 1 through the second gas pipe 3 after passing through the EGR valve 5. The corresponding pressure is detected by the detection part in the inner cavity, thereby determining the pressure difference for controlling the EGR valve 5. Furthermore, by providing a cleaning device 4, gas can be introduced into the inner cavity of the pressure measuring device 1. In one embodiment, cleaning gas is introduced to clean the exhaust gas pollution and any water droplets that may be mixed in within the inner cavity 101, thereby alleviating the pollution of the pressure measuring device 1 by the exhaust gas and preventing icing. This allows the pressure measuring device 1 to be in a better clean state, thus maintaining the accuracy of the pressure data detected by the sensing unit. Therefore, when setting the EGR rate, there is no need to consider the measurement deviation of the pressure measuring device 1 too much, and there is no need to reserve a large EGR rate margin. At the same time, because the cleaning device 4 can clean the pressure measuring device 1 well, including reducing or even avoiding internal icing, it can be better adapted to different regional environments. From this perspective, it also further avoids the need to set a larger margin when considering the EGR rate during automobile manufacturing, which also facilitates standardized vehicle manufacturing, reduces overall costs, and the reduction of the EGR rate margin can further achieve precise engine control, thereby improving the engine's thermal efficiency.

[0037] In an optional embodiment of the present invention, the cleaning device 4 includes a negative pressure device 401 and an air filter 402, wherein the negative pressure device 401 and the air filter 402 are respectively connected to the inner cavity 101.

[0038] Reference Figure 2As shown, in this embodiment, the negative pressure device 401 and the air filter 402 work together to ventilate and clean the inner cavity 101 of the pressure measuring device 1. Specifically, the pressure measuring device 1 can be provided with an air inlet and an air outlet, which are connected to the inner cavity 101. The negative pressure device 401 is connected to the air outlet, so that air can be drawn to the outside through the connected air inlet, inner cavity 101 and air outlet, realizing the introduction and export of gas into and out of the inner cavity 101. In addition, the air filter 402 is connected to the air inlet, so that the outside air is introduced into the inner cavity 101 after being cleaned by the air filter 402. Then, the cleaned air is mixed with the exhaust gas in the inner cavity 101 and cleaned the inside of the inner cavity 101. Then, it is drawn out from the air outlet by the negative pressure device 401, so as to ensure a good cleaning effect on the pressure measuring device and enable the pressure measuring device to accurately detect pressure.

[0039] In an optional embodiment of the present invention, the cleaning device 4 further includes a first gas conduction component 403 and a second gas conduction component 404. The negative pressure device 401 is connected to the inner cavity 101 through the first gas conduction component 403, and the air filter 402 is connected to the inner cavity 101 through the second gas conduction component 404. The second gas conduction component 404 is used to make the flow rate of the gas introduced into the inner cavity 101 less than the flow rate of the gas discharged through the first gas conduction component 403.

[0040] Reference Figure 2 As shown, in this embodiment of the invention, the negative pressure device 401 is connected to the inner cavity 101 through the first gas conduction component 403, enabling air circulation between the inner cavity 101 and the negative pressure device 401. Similarly, the air filter 402 is connected to the inner cavity 101 through the second gas conduction component 404, enabling air circulation between the air filter 402 and the inner cavity 101. Under the action of the negative pressure device 401, air flows along... Figure 2The air enters the air filter 402 from the outside in the direction indicated by the middle arrow. After cleaning the air, it enters the inner cavity 101 through the second gas guiding component 404, where it is cleaned. Then, under the action of the negative pressure device 401, it flows out from the first gas guiding component 403. The first gas guiding component 403 and the second gas guiding component 404 can actively or passively create a difference in velocity between the air entering and exiting the inner cavity 101. Specifically, the gas velocity entering the inner cavity 101 is less than the gas velocity exiting the inner cavity 101, so that when... When the gas velocity entering the inner cavity 101 is relatively low, a diffusion effect is formed, allowing the gas more time to diffuse and mix with the exhaust gas in the inner cavity 101, thus achieving cleaning. Due to the slower velocity, the probability of collisions between gas molecules increases, thereby promoting the mixing effect. In addition, when the gas velocity exiting the inner cavity 101 is higher, turbulence is formed within the inner cavity 101, promoting the mixing of clean gas and exhaust gas within the inner cavity 101, further improving the cleaning effect on the inner cavity 101, and ensuring that the pressure measuring device 1 can perform accurate gas pressure detection for a long time.

[0041] In an optional embodiment of the present invention, the first gas conduction component 403 includes a third gas pipe 413, the second gas conduction component 404 includes a fourth gas pipe 414, the two ends of the third gas pipe 413 are respectively connected to the negative pressure device 401 and the pressure measuring device 1, and the two ends of the fourth gas pipe 414 are respectively connected to the air filter 402 and the pressure measuring device 1.

[0042] The diameter of the fourth air pipe 414 is larger than the diameter of the third air pipe 413, and / or the first gas conduction component 403 further includes a first air valve 423, and the second gas conduction component 404 further includes a second air valve 424. The first air valve 423 is disposed at the third air pipe 413, and the second air valve 424 is disposed at the fourth air pipe 414.

[0043] In this embodiment, both the first gas conduction component 403 and the second gas conduction component 404 are simply tube structures, namely the third air tube 413 and the fourth air tube 414. However, the diameter of the fourth air tube 414 is larger than that of the third air tube 413. This means that when the negative pressure device 401 is working, under the same gas flow rate, the air tube with the larger diameter has a lower flow rate. This allows the gas flow rate introduced into the inner cavity 101 to be lower than the gas flow rate exiting the inner cavity 101 through the tube structure itself, thereby improving the cleaning effect on the inner cavity 101 and ensuring that the pressure measuring device 1 can perform accurate gas pressure detection for a long time.

[0044] In another embodiment, the first gas conduction component 403 and the second gas conduction component 404 may further include a first gas valve 423 and a second gas valve 424, respectively. Specifically, both may be solenoid valves and are fixedly installed at the pressure measuring device 1 to respectively realize the conduction of the third gas pipe 413 and the fourth gas pipe 414, and even the flow rate control of the gas entering and exiting as mentioned above. In a specific embodiment, the opening and closing of the first gas valve 423 and the second gas valve 424 can also be controlled to better form a negative pressure in the inner cavity 101, thereby enabling better cleaning of the pressure measuring device 1. For example, after closing the second gas valve 424, the first gas valve 423 can be closed for a period of time to help exhaust gas be more fully extracted from the inner cavity 101, ensuring the degree of cleanliness. In addition, in some embodiments, the control of each component in the cleaning device 4 can also be realized according to the vehicle's operating conditions, thereby ensuring the cleaning effect and the stability of vehicle operation.

[0045] Reference Figure 3 As shown, another embodiment of the present invention provides a control method for an EGR valve pressure detection system, applied to the EGR valve pressure detection system described above. The control method for the EGR valve pressure detection system includes the following steps:

[0046] Acquire engine operating condition data;

[0047] The operating status of the cleaning device 4 is determined based on the operating condition data.

[0048] The control method for the EGR valve pressure detection system in this embodiment of the invention is used to control the aforementioned EGR valve pressure detection system, and it has the same technical effect as the aforementioned EGR valve pressure detection system. Furthermore, in this embodiment, during control, the cleaning device 4 is precisely controlled by acquiring engine operating condition data. This allows the cleaning device 4 to coordinate well with vehicle operation when cleaning the pressure measuring device 1. For example, different cleaning intensities can be applied under different operating conditions, all achieving good cleaning results. This improves engine thermal efficiency while ensuring stable engine operation without misfires or other abnormal combustion problems.

[0049] Specifically, the operating condition data includes engine load and engine speed; determining the operating status of the cleaning device 4 based on the operating condition data includes the following steps:

[0050] The opening time and duration of the first valve 423 and the second valve 424 of the cleaning device 4 are determined based on the engine load and the engine speed.

[0051] Specifically, in this embodiment of the invention, the opening time and duration of the first valve 423 and the second valve 424 are controlled by combining the engine load and engine speed in the engine operating condition data. Correspondingly, the opening time and duration also correspond to the closing time of the first valve 423 and the second valve 424. This allows for control of the intake and exhaust of air in the inner cavity 101, ensuring that the air cleaned by the air filter 402 in the cleaning device 4 can stably enter the inner cavity 101, be fully mixed in the inner cavity 101, and be discharged. At the same time, this cleaning process is matched with the engine operation. For example, corresponding to different engine loads and engine speeds, the first valve 423 and the second valve 424 are opened at different times and controlled for a certain period of time. During this process, the overall operation of the engine will not be significantly affected.

[0052] Reference Figure 4 As shown, in an optional embodiment of the present invention, determining the opening time and opening duration of the first valve 423 and the second valve 424 of the cleaning device based on the engine speed and the engine load includes the following steps:

[0053] When the engine load is in a preset medium-high load range, the opening time of the first air valve 423 is determined to be the time when the engine speed is at a first preset speed, the opening duration of the second air valve 424 is determined to be a first preset opening duration, and the opening duration of the first air valve 423 is determined to be the sum of the first preset opening duration and the first preset interval duration, wherein the opening time of the second air valve 424 is later than the opening time of the first air valve 423.

[0054] Specifically, after acquiring operating condition data such as engine load and engine speed, the opening time and duration of the first air valve 423 and the second air valve 424 are determined based on these data, thereby realizing the control of the cleaning device 4.

[0055] By defining different load ranges, the engine load can be classified as high load, medium load, low load, etc. When the engine detects in real time that it is in the load range corresponding to high load or medium load, it indicates that the engine load is in the preset medium-high load area. When it is in the load range of low load, it indicates that it is in the preset low load area.

[0056] Specifically, when the engine load is in a preset medium-high load range, the first air valve 423 opens ahead of the second air valve 424. The opening time of the first air valve 423 coincides with the engine speed reaching a first preset speed, which can be set according to actual conditions, such as 0 or near that speed. This ensures that when the engine load is in the preset medium-high load range and the engine speed is 0, the first air valve 423 opens. At this time, the negative pressure device 401 is activated by default. The first air valve 423 is opened first to evacuate the inner cavity 101, creating negative pressure. Then, after a certain interval, the second air valve 424 opens, allowing air to pass through the air filter 401. 2. The filtered gas is subjected to negative pressure and enters the inner cavity 101 along the fourth air pipe 414 to achieve cleaning of the inner cavity 101. The opening time of the second air valve 424 is set to a first preset opening time to continuously introduce clean air into the inner cavity 101 for a period of time to clean the inner cavity 101. Since the second air valve 424 opens later than the first air valve 423, the opening time of the first air valve 423 is set to be longer, which can be until or close to the closing time of the second air valve 424. For example, in an optional embodiment of the present invention, after setting the opening time of the first air valve 423, the first air valve 423 and the second air valve 424 close simultaneously, thereby adapting to the operation of the engine.

[0057] When the engine load is in a preset low load range, the opening time of the first air valve 423 is determined to be the time when the engine speed is at a second preset speed, the opening duration of the second air valve 424 is determined to be a second preset opening duration, and the opening duration of the first air valve 423 is determined to be the sum of the second preset opening duration and the second preset interval duration, wherein the opening time of the second air valve 424 is later than the opening time of the first air valve 423, the second preset interval duration is longer than the first preset interval duration, and the second preset opening duration is longer than the first preset opening duration.

[0058] In this embodiment of the invention, when the engine load is in a preset low load range, the engine may produce more exhaust gas. Therefore, the first valve 423 is opened earlier than the second valve 424, and the opening time of the first valve 423 is when the engine speed is at a second preset speed condition. The second preset speed condition can be set according to the actual situation. The second preset speed condition can be the same as or different from the first preset speed condition. For example, in this embodiment of the invention, it can be set to the same time when the speed is 0. In other embodiments, it can be adaptively adjusted to be different from the first preset speed condition, thereby adapting to different application scenarios.

[0059] First, the first air valve 423 is opened to evacuate the inner cavity 101 and create a negative pressure. Then, after a certain interval, the second air valve 424 is opened, and the air filtered by the air filter 402 enters the inner cavity 101 through the fourth air pipe 414 under the action of negative pressure to achieve cleaning of the inner cavity 101. The opening time of the second air valve 424 is set to a second preset opening time, which is longer than the first preset opening time. Therefore, when the engine is in a preset low-load area, the time for the air filter 402 to introduce clean air into the inner cavity 101 is increased. Correspondingly, the first air valve 423 is also open for a longer time to more thoroughly clean the pressure measuring device 1, so as to ensure the accuracy of the pressure measuring device 1 in detecting pressure. At the same time, in this embodiment of the invention, the second preset interval is longer than the first preset interval. For example, when the first air valve 423 opens earlier, the first air valve 423 also closes later than the second air valve 424, ensuring that the clean gas and exhaust gas in the inner cavity 101 are completely mixed, and the self-cleaning effect is more thorough.

[0060] In one specific embodiment, when the engine is in a preset medium-high load range, the first air valve 423 opens when the engine speed is 0, and then the second air valve 424 opens after a delay of 0.25 seconds to introduce clean gas into the inner cavity 101 for cleaning the pressure measuring device 1. The first preset opening time is 1 second, that is, the second air valve 424 closes after opening for 1 second. At this time, the first preset interval time is set to 0.25 seconds, that is, the opening time of the first air valve 423 is 1.25 seconds, and it closes at the same time as the second air valve 424. This allows for rapid cleaning of the inner cavity 101 without affecting the operation of the engine under medium-high load conditions, and ensures the cleaning effect.

[0061] In another specific embodiment, when the engine is in a preset low-load area, the first valve 423 also opens when the engine speed is 0, and then the second valve 424 opens after a delay of 0.25 seconds. That is, the opening time of the second valve 424 is 0.25 seconds after the opening of the first valve 423. The second preset opening time is 2 seconds, that is, the second valve 424 closes after opening for 2 seconds. At this time, the second preset interval time is set to 0.5 seconds, that is, the opening time of the first valve 423 is 2.5 seconds, and it closes later than the closing time of the second valve 424. This allows for more thorough cleaning of the inner cavity 101. The exhaust time is longer than the intake time, and the negative pressure in the inner cavity 101 will continue for a period of time, thereby allowing the exhaust gas to be more fully extracted and ensuring the accuracy of the pressure measurement after cleaning.

[0062] In an optional embodiment, the cleaning process described above can be performed periodically, or the opening and closing of the first air valve 423 and the second air valve 424 can be repeated two or more times for each start of the cleaning device 4, thereby achieving multiple cleanings. For example, after the first air valve 423 and the second air valve 424 have completed a cleaning process and then closed, the opening and closing control of the first air valve 423 and the second air valve 424 can be performed again after an interval of 5-10 minutes, so as to make the cleaning more thorough. In addition, it can also better prevent water vapor condensation in the inner cavity 101 from affecting the measurement results.

[0063] The pressure measuring device 1 is cleaned by the cleaning device 4 to ensure that it accurately measures pressure over a long period of time, and then feeds this information back to the relevant controller for engine operation control. Experiments show that the overall pressure measurement accuracy of the pressure measuring device 1 can be improved by approximately 1-2%. Therefore, when setting the EGR rate, the percentage margin can typically be reduced, for example, to A-1.5%, where A% is the conventional EGR rate setting value, and 1.5% represents the improved overall pressure measurement accuracy of the pressure measuring device 1. This smaller EGR rate setting ensures stable engine control while achieving higher thermal efficiency.

[0064] In an optional embodiment of the present invention, after cleaning the pressure measuring device 1 by the cleaning device 4, the control method of the pressure detection system of the EGR valve further includes the step of:

[0065] Obtain the gas composition of the inner cavity 101 of the pressure measuring device 1;

[0066] The EGR rate is adjusted according to the gas composition, and when the EGR rate reaches the preset EGR rate, a prompt instruction is generated to remind the user to maintain the cleaning device 4.

[0067] Cleaning device 4 improves the accuracy of pressure measuring device 1 by cleaning pressure measuring device 1. However, with prolonged use, the equipment still faces aging and contamination. Furthermore, when cleaning device 4 uses pipes, negative pressure equipment 401, and air filter 402, contamination also occurs. This raises concerns about ensuring stable engine control and the need for equipment repair or replacement. Therefore, in this embodiment, after cleaning pressure measuring device 1 with cleaning device 4, the gas composition of the inner cavity 101 of pressure measuring device 1 can be obtained by, for example, by installing a gas sensor inside or directly detecting the outgoing gas. This gas composition reflects the current cleaning efficiency of cleaning device 4 on the inner cavity 101, such as whether it can still ensure sufficient cleaning of the inner cavity 101, and the degree of decrease in cleaning efficiency as the equipment operates. For example, as time increases, the proportion of exhaust gas, water vapor, or pollutants in the gas composition gradually increases. Based on this change in proportion, the degree of aging or contamination of cleaning device 4 and pressure measuring device 1 can be determined.

[0068] Therefore, when determining the gas composition, the EGR rate can be adjusted. For example, if the aging or contamination of the cleaning device 4 and the pressure measuring device 1 significantly increases, thus affecting the pressure measurement results of the pressure measuring device 1, the originally set smaller EGR rate can be adaptively increased to improve the margin to a certain extent while ensuring the stability of engine operation. This adjustment process can be gradual or abrupt. The frequency of adjusting the EGR rate according to the gas composition can be adjusted at a set interval, such as once a month. When the EGR rate reaches the preset EGR rate, it indicates that the engine's thermal efficiency has been compromised to a certain extent to ensure stable engine operation. It also reflects that some components of the cleaning device 4 or the pressure measuring device 1 have reached their service life limit. Therefore, a prompt instruction is generated to remind the user to maintain the cleaning device 4 or the pressure measuring device 1, prompting the user to clean or replace the equipment or consumables, thereby improving the measurement effect of the pressure measuring device 1. Subsequently, the EGR rate can be adjusted again to improve the engine's thermal efficiency.

[0069] Another embodiment of the present invention provides a vehicle including a pressure detection system for an EGR valve as described above, and / or including a memory and a processor, the memory for storing a computer program, the processor for implementing a control method for the pressure detection system for an EGR valve as described above when the computer program is executed.

[0070] Reference Figure 2As shown, in this embodiment of the invention, the memory and processor are integrated into the vehicle's ECU (Electronic Control Unit) central control unit 8, thereby receiving the engine's operating condition data to execute the control method of the pressure detection system and achieving accurate real-time control of the cleaning device.

[0071] The vehicle in this invention has similar technical effects to the pressure detection system of the EGR valve and the control method of the pressure detection system of the EGR valve described above, and will not be described in detail here.

[0072] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A control method for a pressure detection system of an EGR valve, characterized in that, A pressure detection system for an EGR valve is provided, comprising a pressure measuring device (1), a first air pipe (2), a second air pipe (3), and a cleaning device (4). The pressure measuring device (1) includes an inner cavity (101) and a detection unit disposed in the inner cavity (101). The inner cavity (101) is connected to the inlet and outlet of the EGR valve (5) respectively via the first air pipe (2) and the second air pipe (3). The detection unit is used to detect the pressure of the first air pipe (2) and the second air pipe (3) respectively in the inner cavity (101). The cleaning device (4) is connected to the inner cavity (101) and is used to clean the inner cavity (101) with gas. The control method of the pressure detection system for the EGR valve includes: Acquire engine operating condition data; The operating status of the cleaning device (4) is determined based on the operating condition data. The operating condition data includes engine load and engine speed; the determination of the operating status of the cleaning device (4) based on the operating condition data includes: determining the opening time and opening duration of the first air valve (423) and the second air valve (424) of the cleaning device (4) based on the engine load and the engine speed; The step of determining the opening time and duration of the first air valve (423) and the second air valve (424) of the cleaning device based on the engine speed and the engine load includes: when the engine load is in a preset medium-high load range, determining the opening time of the first air valve (423) to be the moment when the engine speed is at a first preset speed, determining the opening duration of the second air valve (424) to be a first preset opening duration, and determining the opening duration of the first air valve (423) to be the sum of the first preset opening duration and the first preset interval duration, wherein the opening time of the second air valve (424) is later than that of the first air valve (423). 23) Opening time; when the engine load is in the preset low load area, the opening time of the first air valve (423) is determined to be the time when the engine speed is in the second preset speed condition, the opening duration of the second air valve (424) is determined to be the second preset opening duration, and the opening duration of the first air valve (423) is determined to be the sum of the second preset opening duration and the second preset interval duration, wherein the opening time of the second air valve (424) is later than the opening time of the first air valve (423), the second preset interval duration is longer than the first preset interval duration, and the second preset opening duration is longer than the first preset opening duration.

2. The control method for the pressure detection system of the EGR valve according to claim 1, characterized in that, The cleaning device (4) includes a negative pressure device (401) and an air filter (402), which are respectively connected to the inner cavity (101).

3. The control method for the pressure detection system of the EGR valve according to claim 2, characterized in that, The cleaning device (4) further includes a first gas conduction component (403) and a second gas conduction component (404). The negative pressure device (401) is connected to the inner cavity (101) through the first gas conduction component (403), and the air filter (402) is connected to the inner cavity (101) through the second gas conduction component (404). The second gas conduction component (404) is used to make the flow rate of the gas introduced into the inner cavity (101) less than the flow rate of the gas discharged through the first gas conduction component (403).

4. The control method for the pressure detection system of the EGR valve according to claim 3, characterized in that, The first gas conduction assembly (403) includes a third gas pipe (413), and the second gas conduction assembly (404) includes a fourth gas pipe (414). The two ends of the third gas pipe (413) are respectively connected to the negative pressure device (401) and the pressure measuring device (1), and the two ends of the fourth gas pipe (414) are respectively connected to the air filter (402) and the pressure measuring device (1). The diameter of the fourth gas pipe (414) is larger than the diameter of the third gas pipe (413), and / or, the first gas conduction assembly (403) further includes a first gas valve (423), and the second gas conduction assembly (404) further includes a second gas valve (424), the first gas valve (423) is located at the third gas pipe (413), and the second gas valve (424) is located at the fourth gas pipe (414).

5. The control method for the pressure detection system of the EGR valve according to claim 1, characterized in that, Also includes: After cleaning the pressure measuring device (1) by the cleaning device (4), the gas composition of the inner cavity (101) of the pressure measuring device (1) is obtained; The EGR rate is adjusted according to the gas composition, and when the EGR rate reaches the preset EGR rate, a prompt instruction is generated to remind the user to maintain the cleaning device (4) or the pressure measuring device (1).

6. A vehicle, characterized in that, It includes a memory and a processor, the memory being used to store a computer program, and the processor being used to implement, when the computer program is executed, a control method for the pressure detection system of the EGR valve as described in any one of claims 1-5.

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