A method, device, system and engine for removing water from a pressure sensor

Abstract

The present invention discloses a method, device, system and engine for removing water from a pressure sensor, and relates to the field of engine technology. By monitoring the state of an exhaust gas recirculation valve and determining the pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve, a variety of working conditions can be covered, the detected pressure deviation is more accurate, and the accuracy of exhaust gas recirculation rate control can be improved. The water storage state of the pressure sensor is determined according to the pressure deviation, and the purge mechanism is controlled to purge the pressure sensor with a corresponding purge pressure under different water storage states, which can ensure that the service life of the pressure sensor upstream of the exhaust gas recirculation valve is as long as possible, improve the pressure measurement accuracy, and thus improve the accuracy of exhaust gas recirculation rate control. The method for removing water from a pressure sensor provided by an embodiment of the present invention can ensure the accuracy of engine exhaust gas recirculation rate control, thereby ensuring the stability of engine operation and emission performance.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a method, device, system and engine for removing water from a pressure sensor. Background Art

[0002] Against the backdrop of increasing emission requirements and customer demands for product performance, the engine's original emission levels and power performance need to be precisely controlled.

[0003] The exhaust gas recirculation (EGR) valve in an engine directs some exhaust gas into the intake system, lowering combustion temperatures and reducing nitrogen oxide (NOx) emissions. Exhaust gas pressure upstream of the EGR valve is a key parameter influencing EGR flow. Natural gas engines require precise control of the EGR rate, which necessitates accurate pressure measurement upstream of the valve. Because water can accumulate in the EGR line, water deposited on the pressure sensor upstream of the valve can cause the measured pressure to be lower than the actual pressure, affecting the accuracy of EGR rate control. Summary of the Invention

[0004] The present invention provides a method, device, system and engine for removing water from a pressure sensor, which can ensure the accuracy of controlling the exhaust gas recirculation rate of the engine, thereby ensuring the stability of engine operation and emission performance.

[0005] In a first aspect, an embodiment of the present invention provides a method for removing water from a pressure sensor, which is applicable to an engine including an exhaust gas recirculation valve, a water removal system for a pressure sensor, and a throttle valve, wherein the pressure sensor is located upstream of the exhaust gas recirculation valve; the exhaust gas recirculation valve is disposed in a connecting pipeline between an intake pipe and an exhaust pipe of the engine; the throttle valve is disposed in the intake pipe of the engine, and the connecting pipeline downstream of the exhaust gas recirculation valve is connected to the intake pipe downstream of the throttle valve; the water removal method for the pressure sensor is implemented using the water removal system for the pressure sensor, and the water removal system for the pressure sensor includes a purge mechanism, which is used to purge water accumulated on the pressure sensor;

[0006] The water removal method comprises:

[0007] monitoring a status of the exhaust gas recirculation valve;

[0008] determining a pressure deviation upstream of the exhaust gas recirculation valve according to a state of the exhaust gas recirculation valve;

[0009] determining a water storage state of the pressure sensor according to the pressure deviation;

[0010] The purge mechanism is controlled to purge the pressure sensor at a corresponding purge pressure according to the water storage state.

[0011] Optionally, determining the pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve includes:

[0012] When it is monitored that the exhaust gas recirculation valve is in a fully closed state, obtaining the pressure upstream of the throttle valve;

[0013] obtaining a calculated pressure upstream of the exhaust gas recirculation valve according to the pressure upstream of the throttle valve;

[0014] A first pressure deviation upstream of the exhaust gas recirculation valve is determined according to the calculated pressure and an actually measured pressure upstream of the exhaust gas recirculation valve.

[0015] Optionally, determining the pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve includes:

[0016] When it is detected that the exhaust gas recirculation valve is in an open state, obtaining a throttle pressure ratio;

[0017] When the acquired throttle pressure ratio is less than a first preset value, determining the amount of fresh intake air according to the throttle pressure ratio and the throttle opening; wherein the throttle pressure ratio is a ratio of a pressure downstream of the throttle to a pressure upstream of the throttle;

[0018] Obtaining a first exhaust gas recirculation flow rate according to the total intake air flow rate and the fresh intake air amount;

[0019] A second pressure deviation upstream of the exhaust gas recirculation valve is obtained according to the first exhaust gas recirculation flow rate and a second exhaust gas recirculation flow rate calculated by an original exhaust gas recirculation model.

[0020] Optionally, the engine further includes an oxygen sensor, which is disposed in the exhaust pipe; after obtaining the throttle pressure ratio when the exhaust gas recirculation valve is monitored to be in an open state, the method further includes:

[0021] When the exhaust gas recirculation valve is detected to be in an open state, a throttle pressure ratio is obtained, where the throttle pressure ratio is a ratio of a pressure downstream of the throttle to a pressure upstream of the throttle;

[0022] When the acquired throttle pressure ratio is greater than a first preset value, a third pressure deviation upstream of the exhaust gas recirculation valve is obtained according to a change in a signal from the oxygen sensor.

[0023] Optionally, determining the water storage state of the pressure sensor according to the pressure deviation includes:

[0024] When the pressure deviation is between a first threshold and a second threshold, determining that a small amount of water is stored on the pressure sensor;

[0025] Controlling the purge mechanism to purge the pressure sensor with a corresponding purge pressure according to the water storage state includes:

[0026] The purge mechanism is controlled to purge the pressure sensor at a first purge pressure.

[0027] Optionally, determining the water storage state of the pressure sensor according to the pressure deviation includes:

[0028] When the pressure deviation is between a second threshold and a third threshold, determining that the amount of water stored on the pressure sensor is between a trace amount and a serious amount;

[0029] Controlling the purge mechanism to purge the pressure sensor with a corresponding purge pressure according to the water storage state includes:

[0030] The purge mechanism is controlled to purge the pressure sensor at a second purge pressure.

[0031] Optionally, determining the water storage state of the pressure sensor according to the pressure deviation includes:

[0032] When the pressure deviation is greater than a third threshold, determining that there is serious water accumulation on the pressure sensor;

[0033] Controlling the purge mechanism to purge the pressure sensor with a corresponding purge pressure according to the water storage state includes:

[0034] controlling the purge mechanism to purge the pressure sensor at a third purge pressure;

[0035] The first threshold, the second threshold, and the third threshold increase sequentially, and the first purge pressure, the second purge pressure, and the third purge pressure increase sequentially.

[0036] In a second aspect, an embodiment of the present invention further provides a water removal device for a pressure sensor, comprising:

[0037] An exhaust gas recirculation valve status monitoring module is used to monitor the status of the exhaust gas recirculation valve;

[0038] a pressure deviation determining module, configured to determine a pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve monitored by the exhaust gas recirculation valve state monitoring module;

[0039] a water storage state determining module, configured to determine a water storage state of the pressure sensor according to the pressure deviation determined by the pressure deviation determining module;

[0040] The purge mechanism control module is used to control the purge mechanism to purge the pressure sensor at a corresponding purge pressure according to the water storage state determined by the water storage state determination module.

[0041] In a third aspect, an embodiment of the present invention further provides a water removal system for a pressure sensor, including a purge mechanism;

[0042] The purging mechanism is used for purging water stored on the pressure sensor.

[0043] In a fourth aspect, an embodiment of the present invention further provides an engine, comprising an exhaust gas recirculation valve, the water removal system of the pressure sensor described in the third aspect, and a throttle valve.

[0044] The water removal method, device, system and engine for the pressure sensor provided by the embodiment of the present invention can cover a variety of working conditions by monitoring the state of the exhaust gas recirculation valve and determining the pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve. The detected pressure deviation is more accurate, which can improve the accuracy of the exhaust gas recirculation rate control. The water storage state of the pressure sensor is determined according to the pressure deviation, and the purge mechanism is controlled to purge the pressure sensor with the corresponding purge pressure under different water storage states. This can ensure that the service life of the pressure sensor upstream of the exhaust gas recirculation valve is as long as possible, improve the pressure measurement accuracy, and thus improve the accuracy of the exhaust gas recirculation rate control. The water removal method for the pressure sensor provided by the embodiment of the present invention can ensure the accuracy of the engine exhaust gas recirculation rate control, thereby ensuring the stability of the engine operation and the emission performance.

[0045] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 This is a schematic structural diagram of an engine provided by an embodiment of the present invention;

[0048] Figure 2 This is a flow chart of a method for removing water from a pressure sensor provided by an embodiment of the present invention;

[0049] Figure 3is a flow chart of another method for removing water from a pressure sensor provided by an embodiment of the present invention;

[0050] Figure 4 It is a structural schematic diagram of a water removal device for a pressure sensor provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0053] Figure 1 is a structural diagram of an engine provided by an embodiment of the present invention, Figure 2 This is a flow chart of a method for removing water from a pressure sensor provided by an embodiment of the present invention. The method for removing water from a pressure sensor according to an embodiment of the present invention is applicable to Figure 1 The engine shown in the figure includes an exhaust gas recirculation valve 110, a water removal system 200 for a pressure sensor, and a throttle valve 120. The pressure sensor 130 is located upstream of the exhaust gas recirculation valve 110. The exhaust gas recirculation valve 110 is arranged in a connecting pipe C between an intake pipe A and an exhaust pipe B of the engine. The throttle valve 120 is arranged in the intake pipe A of the engine, and the connecting pipe C downstream of the exhaust gas recirculation valve 110 is connected to the intake pipe A downstream of the throttle valve 120. The water removal method for the pressure sensor provided in the embodiment of the present invention adopts the following method: Figure 1 The water removal system 200 for the pressure sensor shown in FIG is implemented, and the water removal system 200 for the pressure sensor includes a purging mechanism, which is used to purge the water accumulated on the pressure sensor 130 .

[0054] refer to Figure 2, the water removal method comprises the following steps:

[0055] S210: Monitor the status of the exhaust gas recirculation valve.

[0056] Specifically, the exhaust gas recirculation valve can be in a fully closed state or an open state.

[0057] S220: Determine a pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve.

[0058] It is understandable that a single detection method cannot cover the needs of the engine under different operating conditions, resulting in poor applicability of the detection results. The present invention determines the pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve, which can cover various operating conditions of the engine. The detected pressure deviation is more accurate, which can improve the accuracy of exhaust gas recirculation rate control.

[0059] S230: Determine the water storage state of the pressure sensor according to the pressure deviation.

[0060] Specifically, the water status of the pressure sensor includes a slight amount of water on the pressure sensor, a water level between slight and severe, and a severe water level on the pressure sensor. The water status of the pressure sensor can be determined based on the pressure deviation by setting a pressure deviation threshold in advance.

[0061] S240 , controlling the purge mechanism to purge the pressure sensor at a corresponding purge pressure according to the water storage state.

[0062] Specifically, the purge pressure corresponding to different water storage conditions can be set in advance to avoid using excessively high purge pressures in all water storage conditions, which could reduce the life of the pressure sensor, affect pressure measurement accuracy, and affect the accuracy of EGR rate control. Staggered purges can be performed during non-EGR rate calculations to prevent EGR rate deviations caused by purges, thereby preventing impacts on system stability and, consequently, EGR rate control accuracy.

[0063] The embodiment of the present invention monitors the state of the exhaust gas recirculation valve and determines the pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve. This can cover a variety of working conditions, detect more accurate pressure deviations, and improve the accuracy of exhaust gas recirculation rate control. The water storage state of the pressure sensor is determined according to the pressure deviation, and the purge mechanism is controlled to purge the pressure sensor with a corresponding purge pressure under different water storage states. This can ensure that the service life of the pressure sensor upstream of the exhaust gas recirculation valve is as long as possible, improve the pressure measurement accuracy, and thus improve the accuracy of exhaust gas recirculation rate control. The water removal method of the pressure sensor provided by the embodiment of the present invention can ensure the accuracy of engine exhaust gas recirculation rate control, thereby ensuring the stability of engine operation and emission performance.

[0064] Figure 3 This is a flow chart of another method for removing water from a pressure sensor provided by an embodiment of the present invention, with reference to Figure 3 , the water removal method comprises the following steps:

[0065] S310: Monitor the status of the exhaust gas recirculation valve.

[0066] S321. When it is detected that the exhaust gas recirculation valve is in a fully closed state, obtain the pressure upstream of the throttle valve.

[0067] S331. Obtain a calculated pressure upstream of the exhaust gas recirculation valve based on the pressure upstream of the throttle valve.

[0068] S341. Determine a first pressure deviation upstream of the exhaust gas recirculation valve according to the calculated pressure and the actually measured pressure upstream of the exhaust gas recirculation valve.

[0069] Specifically, the measured pressure upstream of the exhaust gas recirculation valve is measured by a pressure sensor upstream of the exhaust gas recirculation valve. The calculated pressure is subtracted from the actually measured measured pressure upstream of the exhaust gas recirculation valve to obtain a first pressure deviation upstream of the exhaust gas recirculation valve.

[0070] It is understandable that when the exhaust gas recirculation valve is monitored to be in a fully closed state, there is a one-to-one correspondence between the pressure upstream of the exhaust gas recirculation valve and the pressure upstream of the throttle valve. The pressure upstream of the exhaust gas recirculation valve can be inferred by directly measuring the pressure upstream of the throttle valve to obtain the calculated pressure upstream of the exhaust gas recirculation valve. The calculated pressure can then be compared with the actually measured pressure upstream of the exhaust gas recirculation valve, thereby determining the first pressure deviation upstream of the exhaust gas recirculation valve.

[0071] S360: Determine the water storage state of the pressure sensor according to the pressure deviation.

[0072] Specifically, in this embodiment, the water storage state of the pressure sensor is determined according to the first pressure deviation.

[0073] S370 , controlling the purge mechanism to purge the pressure sensor with a corresponding purge pressure according to the water storage state.

[0074] Optional, Figure 2 Step S220 in the embodiment may include steps S321 to S341.

[0075] Continue to refer Figure 3 , after step S310, the following steps may also be included:

[0076] S322: When it is detected that the exhaust gas recirculation valve is in the open state, obtain the throttle pressure ratio.

[0077] S332: When the acquired throttle pressure ratio is less than a first preset value, determine the amount of fresh intake air according to the throttle pressure ratio and the throttle opening.

[0078] The throttle pressure ratio is the ratio of the pressure downstream of the throttle valve to the pressure upstream of the throttle valve. The throttle pressure ratio can reflect the throttling state of the engine's intake system. Specifically, when the throttle pressure ratio is greater than a first preset value, the throttle throttling effect is better. For example, the first preset value can be set to 0.95.

[0079] S342: Obtain a first exhaust gas recirculation flow rate according to the total intake air flow rate and the fresh intake air amount.

[0080] S352: Obtain a second pressure deviation upstream of the exhaust gas recirculation valve according to the first exhaust gas recirculation flow rate and a second exhaust gas recirculation flow rate calculated by the original exhaust gas recirculation model.

[0081] It is understood that when the EGR valve is monitored to be open and the acquired throttle pressure ratio is less than the first preset value, the throttle valve is not fully open, and the throttle flow equation has high calculation accuracy. The fresh intake air volume is calculated using the throttle pressure ratio and throttle opening, and the first EGR flow rate is obtained by subtracting the fresh intake air volume from the total intake air flow rate. Based on the first EGR flow rate and the second EGR flow rate calculated using the original EGR model, a second pressure deviation upstream of the EGR valve can be inferred.

[0082] S360: Determine the water storage state of the pressure sensor according to the pressure deviation.

[0083] Specifically, in this embodiment, the water storage state of the pressure sensor is determined according to the second pressure deviation.

[0084] S370 , controlling the purge mechanism to purge the pressure sensor with a corresponding purge pressure according to the water storage state.

[0085] Optional, Figure 2 Step S220 may further include steps S322 to S352.

[0086] On the basis of the above embodiment, the engine further includes an oxygen sensor, which is arranged in the exhaust pipe; Figure 3 , after step S322, the following steps may also be included:

[0087] S333: When the acquired throttle pressure ratio is greater than a first preset value, obtain a third pressure deviation upstream of the exhaust gas recirculation valve according to a signal change of the oxygen sensor.

[0088] It should be noted that when the throttle pressure ratio is greater than the first preset value, the throttle is close to fully open, the throttle throttling effect is weakened, and the throttle throttling equation is no longer applicable, which will lead to a decrease in detection accuracy.

[0089] It's understandable that when the exhaust gas recirculation valve is detected to be open and the throttle pressure ratio is greater than the first preset value, the throttle is near full open, and the throttle equation calculation is inaccurate. The intake system is no longer subject to throttling, and combustion is closer to stoichiometric combustion. At this point, the oxygen sensor signal is more stable. Based on the oxygen sensor signal changes, a third pressure deviation upstream of the exhaust gas recirculation valve can be obtained. The oxygen sensor is used to detect the oxygen concentration in the engine exhaust, which indirectly reflects the air-fuel ratio.

[0090] S360: Determine the water storage state of the pressure sensor according to the pressure deviation.

[0091] Specifically, in this embodiment, the water storage state of the pressure sensor is determined according to the third pressure deviation.

[0092] S370 , controlling the purge mechanism to purge the pressure sensor with a corresponding purge pressure according to the water storage state.

[0093] Optional, Figure 2 Step S220 may further include step S322 and step S333.

[0094] Optionally, based on the above embodiment, step S360 includes: when the pressure deviation is between the first threshold and the second threshold, determining that a small amount of water is present on the pressure sensor. Step S370 includes: controlling the purge mechanism to purge the pressure sensor at a first purge pressure.

[0095] Exemplarily, the first purge pressure is 1 bar.

[0096] Optionally, based on the above embodiment, step S360 further includes: when the pressure deviation is between the second threshold and the third threshold, determining that the amount of water stored on the pressure sensor is between trace and severe. Step S370 further includes: controlling the purge mechanism to purge the pressure sensor at a second purge pressure.

[0097] Exemplarily, the second purge pressure is 2 bar.

[0098] Optionally, based on the above embodiment, step S360 further includes: determining that there is severe water accumulation on the pressure sensor when the pressure deviation is greater than a third threshold. Step S370 further includes: controlling the purge mechanism to purge the pressure sensor at a third purge pressure. The first, second, and third thresholds increase sequentially, and the first, second, and third purge pressures increase sequentially.

[0099] Exemplarily, the third purge pressure is 3 bar.

[0100] It is understandable that because the pressure sensor upstream of the exhaust gas recirculation valve has a certain pressure tolerance limit, excessively high purge pressure will shorten the life of the pressure sensor. Therefore, it is necessary to classify the purge pressure, and avoid using a higher purge pressure when the water storage volume is low. By adjusting the purge pressure based on the pressure deviation, the embodiment of the present invention can ensure the longest possible service life of the pressure sensor upstream of the exhaust gas recirculation valve.

[0101] In summary, the pressure sensor dewatering method provided by the embodiments of the present invention performs multi-level diagnosis based on the exhaust gas recirculation valve status to determine the pressure deviation upstream of the exhaust gas recirculation valve. This method addresses the low accuracy and poor applicability of existing techniques for detecting pressure drift upstream of the exhaust gas recirculation valve. By combining a layered diagnostic strategy with multiple detection methods under different operating conditions, precise detection of the pressure deviation upstream of the exhaust gas recirculation valve is achieved. The purge pressure is then dynamically adjusted based on the pressure deviation, thereby ensuring engine operating stability and emissions performance. By employing different diagnostic methods according to different operating conditions, the full operating range is covered, ensuring optimal diagnostic performance at each level. The pressure sensor dewatering method provided by the embodiments of the present invention ensures accurate control of the engine's exhaust gas recirculation rate, thereby ensuring stable engine operation and emissions performance. Furthermore, staggered purges during non-exhaust gas recirculation rate calculations prevent purge-induced deviations in the exhaust gas recirculation rate, thereby preventing system stability and thus impacting the accuracy of exhaust gas recirculation rate control.

[0102] Figure 4 This is a schematic diagram of a water removal device for a pressure sensor according to an embodiment of the present invention. Figure 4 The device includes: an exhaust gas recirculation valve state monitoring module 410, a pressure deviation determination module 420, a water storage state determination module 430 and a purge mechanism control module 440.

[0103] The exhaust gas recirculation valve status monitoring module 410 is used to monitor the status of the exhaust gas recirculation valve; the pressure deviation determination module 420 is used to determine the pressure deviation upstream of the exhaust gas recirculation valve according to the status of the exhaust gas recirculation valve monitored by the exhaust gas recirculation valve status monitoring module 410; the water storage status determination module 430 is used to determine the water storage status of the pressure sensor according to the pressure deviation determined by the pressure deviation determination module 420; the purge mechanism control module 440 is used to control the purge mechanism to purge the pressure sensor with a corresponding purge pressure according to the water storage status determined by the water storage status determination module 430.

[0104] The water removal device for the pressure sensor provided in an embodiment of the present invention can execute the water removal method for the pressure sensor provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. For contents not described in detail in this embodiment, please refer to the water removal method for the pressure sensor provided in the above embodiment.

[0105] Continue to refer Figure 1 The embodiment of the present invention further provides a water removal system 200 for a pressure sensor, comprising a purge mechanism; the purge mechanism is used to purge the water stored on the pressure sensor.

[0106] The purge mechanism of the embodiment of the present invention can dynamically and timely remove water from the pressure sensor upstream of the exhaust gas recirculation valve, thereby reducing the time required for manual processing.

[0107] Continue to refer Figure 1 An embodiment of the present invention further provides an engine, including an exhaust gas recirculation valve 110 , a water removal system 200 for the pressure sensor of the above embodiment, and a throttle valve 120 .

[0108] Continue to refer Figure 1 The engine further includes a pressure sensor 130 located upstream of an exhaust gas recirculation valve 110. The exhaust gas recirculation valve 110 is disposed in a connecting pipe C between an intake pipe A and an exhaust pipe B of the engine. A throttle valve 120 is disposed in the intake pipe A of the engine, and a connecting pipe C downstream of the exhaust gas recirculation valve 110 is connected to the intake pipe A downstream of the throttle valve 120.

[0109] Continue to refer Figure 1 The engine further includes: an exhaust gas recirculation valve downstream sensor 140 , an intercooler 150 , a turbocharger 160 , an exhaust gas recirculation cooler 170 , an exhaust gas recirculation check valve 180 and a cylinder 190 .

[0110] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0111] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for removing water from a pressure sensor, characterized in that: Applicable to an engine including an exhaust gas recirculation valve, a water removal system of a pressure sensor, and a throttle valve, wherein the pressure sensor is located upstream of the exhaust gas recirculation valve; the exhaust gas recirculation valve is arranged in a connecting pipeline between an intake pipe and an exhaust pipe of the engine; the throttle valve is arranged in the intake pipe of the engine, and the connecting pipeline downstream of the exhaust gas recirculation valve is connected to the intake pipe downstream of the throttle valve; the water removal method of the pressure sensor is implemented by the water removal system of the pressure sensor, and the water removal system of the pressure sensor includes a purge mechanism, which is used to purge water accumulated on the pressure sensor; The water removal method comprises: monitoring a status of the exhaust gas recirculation valve; determining a pressure deviation upstream of the exhaust gas recirculation valve according to a state of the exhaust gas recirculation valve; determining a water storage state of the pressure sensor according to the pressure deviation; controlling the purge mechanism to purge the pressure sensor at a corresponding purge pressure according to the water storage state; Determining the pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve includes: When it is monitored that the exhaust gas recirculation valve is in a fully closed state, obtaining the pressure upstream of the throttle valve; obtaining a calculated pressure upstream of the exhaust gas recirculation valve according to the pressure upstream of the throttle valve; determining a first pressure deviation upstream of the exhaust gas recirculation valve according to the calculated pressure and an actually measured pressure upstream of the exhaust gas recirculation valve; When it is detected that the exhaust gas recirculation valve is in an open state, obtaining a throttle pressure ratio; When the acquired throttle pressure ratio is less than a first preset value, determining the amount of fresh intake air according to the throttle pressure ratio and the throttle opening; wherein the throttle pressure ratio is a ratio of a pressure downstream of the throttle to a pressure upstream of the throttle; Obtaining a first exhaust gas recirculation flow rate according to the total intake air flow rate and the fresh intake air amount; obtaining a second pressure deviation upstream of the exhaust gas recirculation valve according to the first exhaust gas recirculation flow rate and a second exhaust gas recirculation flow rate calculated by an original exhaust gas recirculation model; The engine further includes an oxygen sensor disposed in the exhaust pipe; after obtaining the throttle pressure ratio when the exhaust gas recirculation valve is detected to be in an open state, the engine further includes: When the acquired throttle pressure ratio is greater than a first preset value, a third pressure deviation upstream of the exhaust gas recirculation valve is obtained according to a change in a signal from the oxygen sensor.

2. The method for removing water from a pressure sensor according to claim 1, wherein: Determining the water status of the pressure sensor according to the pressure deviation includes: When the pressure deviation is between a first threshold and a second threshold, determining that a small amount of water is stored on the pressure sensor; Controlling the purge mechanism to purge the pressure sensor with a corresponding purge pressure according to the water storage state includes: The purge mechanism is controlled to purge the pressure sensor at a first purge pressure.

3. The method for removing water from a pressure sensor according to claim 2, wherein: Determining the water status of the pressure sensor according to the pressure deviation includes: When the pressure deviation is between a second threshold and a third threshold, determining that the amount of water stored on the pressure sensor is between a trace amount and a serious amount; Controlling the purge mechanism to purge the pressure sensor with a corresponding purge pressure according to the water storage state includes: The purge mechanism is controlled to purge the pressure sensor at a second purge pressure.

4. The method for removing water from a pressure sensor according to claim 3, wherein: Determining the water status of the pressure sensor according to the pressure deviation includes: When the pressure deviation is greater than a third threshold, determining that there is serious water accumulation on the pressure sensor; Controlling the purge mechanism to purge the pressure sensor with a corresponding purge pressure according to the water storage state includes: controlling the purge mechanism to purge the pressure sensor at a third purge pressure; The first threshold, the second threshold, and the third threshold increase sequentially, and the first purge pressure, the second purge pressure, and the third purge pressure increase sequentially.

5. A water removal device for a pressure sensor, characterized in that: include: An exhaust gas recirculation valve status monitoring module is used to monitor the status of the exhaust gas recirculation valve; a pressure deviation determining module, configured to determine a pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve monitored by the exhaust gas recirculation valve state monitoring module; a water storage state determining module, configured to determine a water storage state of the pressure sensor according to the pressure deviation determined by the pressure deviation determining module; a purge mechanism control module, configured to control the purge mechanism to purge the pressure sensor at a corresponding purge pressure according to the water storage state determined by the water storage state determination module; The determining the pressure deviation upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve monitored by the exhaust gas recirculation valve state monitoring module includes: When it is monitored that the exhaust gas recirculation valve is in a fully closed state, obtaining the pressure upstream of the throttle valve; obtaining a calculated pressure upstream of the exhaust gas recirculation valve according to the pressure upstream of the throttle valve; determining a first pressure deviation upstream of the exhaust gas recirculation valve according to the calculated pressure and an actually measured pressure upstream of the exhaust gas recirculation valve; When it is detected that the exhaust gas recirculation valve is in an open state, obtaining a throttle pressure ratio; When the acquired throttle pressure ratio is less than a first preset value, determining the amount of fresh intake air according to the throttle pressure ratio and the throttle opening; wherein the throttle pressure ratio is a ratio of a pressure downstream of the throttle to a pressure upstream of the throttle; Obtaining a first exhaust gas recirculation flow rate according to the total intake air flow rate and the fresh intake air amount; obtaining a second pressure deviation upstream of the exhaust gas recirculation valve according to the first exhaust gas recirculation flow rate and a second exhaust gas recirculation flow rate calculated by an original exhaust gas recirculation model; After acquiring the throttle pressure ratio when monitoring that the exhaust gas recirculation valve is in the open state, the method further includes: When the acquired throttle pressure ratio is greater than a first preset value, a third pressure deviation upstream of the exhaust gas recirculation valve is obtained according to a signal change of an oxygen sensor.

6. A water removal system for a pressure sensor, characterized in that: A water removal device and a purge mechanism comprising the pressure sensor according to claim 5; The purging mechanism is used for purging water stored on the pressure sensor.

7. An engine, characterized in that: The invention comprises an exhaust gas recirculation valve, a water removal system for the pressure sensor according to claim 6, and a throttle valve.

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