Water removal method, device and system for pressure sensor and engine

Abstract

The invention discloses a water removal method, device and system of a pressure sensor and an engine, and relates to the technical field of engines, the state of an exhaust gas recirculation valve is monitored, the upstream pressure deviation value of the exhaust gas recirculation valve is determined according to the state of the exhaust gas recirculation valve, various working conditions can be covered, the detected pressure deviation value is more accurate, and the water removal efficiency is improved. The control accuracy of the exhaust gas recirculation rate can be improved. The water storage state of the pressure sensor is determined according to the pressure deviation value, and the purging mechanism is controlled to purge the pressure sensor at the corresponding purging pressure in different water storage states, so that the service life of the pressure sensor at the upstream of the exhaust gas recirculation valve can be prolonged as long as possible, and the pressure measurement precision is improved; therefore, the control accuracy of the exhaust gas recirculation rate is improved. By the adoption of the water removal method of the pressure sensor, the control accuracy of the exhaust gas recirculation rate of the engine can be ensured, and therefore the operation stability and emission performance of the engine are ensured.

Description

Technical Field

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

[0002] Under the background of increasing emission requirements and customers' requirements for product performance, the original exhaust water level and power performance of the engine need to be accurately controlled.

[0003] The Exhaust Gas Re-circulation (EGR) valve in the engine is used to introduce part of the exhaust gas into the intake system to reduce the combustion temperature and reduce nitrogen oxide (NOx) emissions. The exhaust gas pressure upstream of the EGR valve is a key parameter affecting the EGR flow rate. A natural gas engine needs to accurately control the exhaust gas recirculation rate, which requires accurate measurement of the pressure upstream of the exhaust gas recirculation valve. Since water is generated in the exhaust gas recirculation pipeline, the pressure sensor upstream of the exhaust gas recirculation valve will cause the measured pressure to be lower than the actual pressure after being attached with water, affecting the accuracy of the exhaust gas recirculation 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 the exhaust gas recirculation rate control of the engine, thereby ensuring the stability of the engine operation and the 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 the pressure sensor and a throttle valve. The pressure sensor is located upstream of the exhaust gas recirculation valve; the exhaust gas recirculation valve is arranged in a connecting pipeline between the intake pipeline and the exhaust pipeline of the engine; the throttle valve is arranged in the intake pipeline of the engine, and the connecting pipeline downstream of the exhaust gas recirculation valve is connected to the intake pipeline downstream of the throttle valve; the water removal method for the pressure sensor is implemented by using the water removal system for the pressure sensor, and the water removal system for the pressure sensor includes a purging mechanism for purging the accumulated water on the pressure sensor.

[0006] The water removal method includes:

[0007] Monitoring the state of the exhaust gas recirculation valve;

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

[0009] Determining the accumulated water state of the pressure sensor according to the pressure deviation amount;

[0010] Control the purging mechanism to purge the pressure sensor at a corresponding purging pressure according to the water storage state.

[0011] Optionally, determining the pressure deviation amount 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, obtain the pressure upstream of the throttle valve;

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

[0014] Determine the first pressure deviation amount upstream of the exhaust gas recirculation valve according to the calculated pressure and the measured pressure upstream of the exhaust gas recirculation valve actually measured.

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

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

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

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

[0019] Obtain the second pressure deviation amount upstream of the exhaust gas recirculation valve according to the first exhaust gas recirculation flow rate and the second exhaust gas recirculation flow rate calculated by the original exhaust gas recirculation model.

[0020] Optionally, the engine further includes an oxygen sensor, and the oxygen sensor is arranged on the exhaust pipe; after obtaining the throttle pressure ratio when it is monitored that the exhaust gas recirculation valve is in an open state, it further includes:

[0021] When it is monitored that the exhaust gas recirculation valve is in an open state, obtain the throttle pressure ratio upstream, and the throttle pressure ratio is the ratio of the downstream pressure of the throttle valve to the upstream pressure of the throttle valve;

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

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

[0024] When the pressure deviation is between the first threshold and the second threshold, it is determined that there is a small amount of accumulated water on the pressure sensor;

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

[0026] Controlling the purging mechanism to purge the pressure sensor with a first purging pressure.

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

[0028] When the pressure deviation is between the second threshold and the third threshold, it is determined that the amount of accumulated water on the pressure sensor is between a small amount and a serious amount;

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

[0030] Controlling the purging mechanism to purge the pressure sensor with a second purging pressure.

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

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

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

[0034] Controlling the purging mechanism to purge the pressure sensor with a third purging pressure;

[0035] Wherein, the first threshold, the second threshold, and the third threshold increase in sequence, and the first purging pressure, the second purging pressure, and the third purging pressure increase in sequence.

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

[0037] An exhaust gas recirculation valve state monitoring module, configured to monitor the state of the exhaust gas recirculation valve;

[0038] A pressure deviation amount determination module, configured to determine the pressure deviation amount 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 accumulation state determination module, configured to determine the water accumulation state of the pressure sensor according to the pressure deviation amount determined by the pressure deviation amount determination module;

[0040] A purging mechanism control module, configured to control the purging mechanism to purge the pressure sensor at a corresponding purging pressure according to the water accumulation state determined by the water accumulation 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 purging mechanism;

[0042] The purging mechanism is used to purge the accumulated water on the pressure sensor.

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

[0044] The water removal method, device, system and engine for the pressure sensor provided by the embodiments 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 amount upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve. The detected pressure deviation amount is more accurate, which can improve the accuracy of exhaust gas recirculation rate control. Determining the water accumulation state of the pressure sensor according to the pressure deviation amount and controlling the purging mechanism to purge the pressure sensor at a corresponding purging pressure under different water accumulation states 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. Using the water removal method for the pressure sensor provided by the embodiments of the present invention can ensure the accuracy of the exhaust gas recirculation rate control of the engine, thereby ensuring the stability and emission performance of the engine operation.

[0045] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily 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 will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

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

[0048] Figure 2 is a flowchart of a water removal method for a pressure sensor provided by an embodiment of the present invention;

[0049] Figure 3It is a flowchart of another water removal method for a pressure sensor provided by an embodiment of the present invention;

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

[0051] In order to enable those skilled in the art to better understand the solution 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope 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 drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances 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 "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0053] Figure 1 It is a schematic structural diagram of an engine provided by an embodiment of the present invention, Figure 2 It is a flowchart of a water removal method for a pressure sensor provided by an embodiment of the present invention. The water removal method for the pressure sensor in the embodiment of the present invention is applicable to an engine as shown in Figure 1 The engine shown in 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 disposed in a connecting pipe C between an intake pipe A and an exhaust pipe B of the engine; the throttle valve 120 is disposed 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 by the embodiment of the present invention is implemented by using a water removal system 200 for a pressure sensor as shown in Figure 1 The water removal system 200 for a pressure sensor shown in includes a purging mechanism, and the purging mechanism is used to purge the accumulated water 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 state of the exhaust gas recirculation valve includes a fully closed state and 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 storage state of the pressure sensor includes a small amount of water on the pressure sensor, a water storage amount between a small amount and a serious amount, and a serious amount of water on the pressure sensor. The water storage state of the pressure sensor can be determined according to the pressure deviation by setting a threshold of the pressure deviation in advance.

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

[0062] Specifically, the purge pressure corresponding to different water storage states can be set in advance to avoid using too high a purge pressure in all water storage states, which reduces the life of the pressure sensor, affects the pressure measurement accuracy, and affects the accuracy of the exhaust gas recirculation rate control. The purge can be staggered when the exhaust gas recirculation rate is not calculated, which can prevent the exhaust gas recirculation rate deviation caused by the purge, avoid affecting the stability of the system operation, and thus avoid affecting the accuracy of the exhaust gas recirculation rate control.

[0063] 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 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 the exhaust gas recirculation rate control of the engine, thereby ensuring the stability of engine operation and emission performance.

[0064] Figure 3 It is a flowchart of another water removal method for a pressure sensor provided by an embodiment of the present invention. Referring to Figure 3 , the water removal method includes the following steps:

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

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

[0067] S331. Obtain the calculated pressure upstream of the exhaust gas recirculation valve according to the pressure upstream of the throttle valve.

[0068] S341. Determine the first pressure deviation amount upstream of the exhaust gas recirculation valve according to the calculated pressure and the measured pressure upstream of the actually measured 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. Subtracting the actually measured pressure upstream of the exhaust gas recirculation valve from the calculated pressure can obtain the first pressure deviation amount upstream of the exhaust gas recirculation valve.

[0070] It can be understood that when it is monitored that the exhaust gas recirculation valve is in the 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 deduced by directly measuring the pressure upstream of the throttle valve to obtain the calculated pressure upstream of the exhaust gas recirculation valve, and then comparing it with the actually measured pressure upstream of the exhaust gas recirculation valve, so as to determine the first pressure deviation amount upstream of the exhaust gas recirculation valve.

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

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

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

[0074] Optionally, Figure 2 step S220 in

[0075] Continue to refer to Figure 3 , after step S310, it may further include:

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

[0077] S332. When the obtained throttle pressure ratio is less than the first preset value, determine the fresh intake air quantity according to the throttle pressure ratio and the throttle opening degree.

[0078] Among them, the throttle pressure ratio is the ratio of the downstream pressure of the throttle valve to the upstream pressure 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 the first preset value, the throttle throttling effect is better. Exemplarily, the first preset value can be set to 0.95.

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

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

[0081] It can be understood that when it is monitored that the exhaust gas recirculation valve is in the open state and the obtained throttle pressure ratio is less than the first preset value, at this time the throttle valve is not fully opened, and the calculation accuracy of the throttle throttling equation is high. Calculate the fresh intake air quantity through the throttle pressure ratio and the throttle opening degree, and obtain the first exhaust gas recirculation flow rate by subtracting the fresh intake air quantity from the total intake air flow rate. According to the first exhaust gas recirculation flow rate and the second exhaust gas recirculation flow rate calculated by the original exhaust gas recirculation model, the second pressure deviation amount upstream of the exhaust gas recirculation valve can be deduced.

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

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

[0084] S370. Control the purging mechanism to purge the pressure sensor with the corresponding purging pressure according to the water storage state.

[0085] Optionally, Figure 2 Step S220 in

[0086] On the basis of the above embodiment, the engine further includes an oxygen sensor, and the oxygen sensor is arranged in the exhaust pipe; continue to refer to Figure 3 , after step S322, it may further include:

[0087] S333. When the obtained throttle pressure ratio is greater than the first preset value, obtain the third pressure deviation amount upstream of the exhaust gas recirculation valve according to the 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 weakens, and the throttle throttling equation is no longer applicable, which will lead to a decrease in detection accuracy.

[0089] It can be understood that when it is monitored that the exhaust gas recirculation valve is in the open state and the obtained throttle pressure ratio is greater than the first preset value, the throttle is close to fully open at this time, and the throttle throttling equation is not accurately calculated. The intake system is no longer affected by the throttle throttling effect, and the combustion is closer to stoichiometric combustion. At this time, the stability of the oxygen sensor signal is relatively high. According to the signal change of the oxygen sensor, the third pressure deviation amount upstream of the exhaust gas recirculation valve can be obtained. Among them, the oxygen sensor is used to detect the oxygen concentration in the engine exhaust gas and can indirectly reflect the air-fuel ratio.

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

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

[0092] S370. Control the purging mechanism to purge the pressure sensor with the corresponding purging pressure according to the water storage state.

[0093] Optionally, Figure 2 Step S220 in

[0094] Optionally, on the basis of the above embodiment, step S360 includes: when the pressure deviation amount is between the first threshold and the second threshold, it is determined that there is a small amount of water stored on the pressure sensor. Step S370 includes: controlling the purging mechanism to purge the pressure sensor with the first purging pressure.

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

[0096] Optionally, on the basis of the above embodiment, step S360 further includes: when the pressure deviation amount is between the second threshold and the third threshold, it is determined that the water storage amount on the pressure sensor is between a small amount and a serious amount. Step S370 further includes: controlling the purging mechanism to purge the pressure sensor with the second purging pressure.

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

[0098] Optionally, on the basis of the above embodiment, step S360 further includes: when the pressure deviation amount is greater than the third threshold, it is determined that there is serious water storage on the pressure sensor. Step S370 further includes: controlling the purging mechanism to purge the pressure sensor with the third purging pressure. Among them, the first threshold, the second threshold, and the third threshold increase in sequence, and the first purging pressure, the second purging pressure, and the third purging pressure increase in sequence.

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

[0100] It can be understood that, due to the certain pressure resistance limit of the pressure sensor upstream of the exhaust gas recirculation valve, an excessive purge pressure will reduce the service life of the pressure sensor. Therefore, it is necessary to classify the purge pressure, and a higher purge pressure should not be used when the water storage is low. In the embodiment of the present invention, the purge pressure is adjusted according to the pressure deviation amount, which can ensure the longest possible service life of the pressure sensor upstream of the exhaust gas recirculation valve.

[0101] In summary, the water removal method of the pressure sensor provided by the embodiment of the present invention performs multi-level diagnosis according to the state of the exhaust gas recirculation valve to determine the pressure deviation amount upstream of the exhaust gas recirculation valve, which can solve the problems of low detection accuracy and poor applicability of the pressure drift upstream of the exhaust gas recirculation valve in the prior art. Through the hierarchical diagnosis strategy, combined with a variety of detection means under different working conditions, the accurate detection of the pressure deviation amount upstream of the exhaust gas recirculation valve is realized, and then the purge pressure is dynamically adjusted according to the situation of the pressure deviation amount, so as to ensure the stability of the engine operation and the emission performance. According to different operating conditions, different diagnostic means are adopted to ensure that all operating condition ranges are covered and the optimal diagnostic method for each level is ensured. By using the water removal method of the pressure sensor provided by the embodiment of the present invention, the accuracy of the engine exhaust gas recirculation rate control can be ensured, thereby ensuring the stability of the engine operation and the emission performance. In addition, during the non-exhaust gas recirculation rate calculation, the staggered purge is performed, which can prevent the deviation of the exhaust gas recirculation rate caused by the purge, avoid affecting the stability of the system operation, and thus avoid affecting the accuracy of the exhaust gas recirculation rate control.

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

[0103] The exhaust gas recirculation valve state monitoring module 410 is used to monitor the state of the exhaust gas recirculation valve; the pressure deviation amount determination module 420 is used to determine the pressure deviation amount 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 410; the water storage state determination module 430 is used to determine the water storage state of the pressure sensor according to the pressure deviation amount determined by the pressure deviation amount 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 state determined by the water storage state determination module 430.

[0104] The water removal device of the pressure sensor provided by the embodiment of the present invention can execute the water removal method of the pressure sensor provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. For the content not described in detail in this embodiment, reference can be made to the water removal method of the pressure sensor provided by the above embodiment.

[0105] Continuing to refer Figure 1 , the embodiment of the present invention also provides a water removal system 200 for a pressure sensor, including a purging mechanism; the purging mechanism is used to purge the accumulated water on the pressure sensor.

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

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

[0108] Continuing to refer Figure 1 , the engine further includes a pressure sensor 130 located upstream of the 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; the throttle valve 120 is disposed 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.

[0109] Continuing 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 various forms of processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in the present invention can be executed 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, and no limitation is made herein.

[0111] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for removing water from a pressure sensor, characterized in that, An engine applicable to a water removal system including an exhaust gas recirculation valve, a pressure sensor, and a throttle valve. 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 pipeline and an exhaust pipeline of the engine; the throttle valve is disposed in the intake pipeline of the engine, and the connecting pipeline downstream of the exhaust gas recirculation valve is connected to the intake pipeline 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 purging mechanism for purging the accumulated water on the pressure sensor; The water removal method includes: Monitoring the state of the exhaust gas recirculation valve; Determining the pressure deviation amount upstream of the exhaust gas recirculation valve according to the state of the exhaust gas recirculation valve; Determining the water accumulation state of the pressure sensor according to the pressure deviation amount; Controlling the purging mechanism to purge the pressure sensor with a corresponding purging pressure according to the water accumulation state.

2. The water removal method of the pressure sensor according to claim 1, characterized in that, The determining the pressure deviation amount 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 the calculated pressure upstream of the exhaust gas recirculation valve according to the pressure upstream of the throttle valve; Determining the first pressure deviation amount upstream of the exhaust gas recirculation valve according to the calculated pressure and the measured pressure upstream of the exhaust gas recirculation valve actually measured.

3. The water removal method of the pressure sensor according to claim 1, characterized in that, The determining the pressure deviation amount 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 an open state, obtaining the throttle pressure ratio; When the obtained throttle pressure ratio is less than a first preset value, determining the fresh intake air amount according to the throttle pressure ratio and the throttle opening; wherein, the throttle pressure ratio is the ratio of the downstream pressure of the throttle valve to the upstream pressure of the throttle valve; Obtaining the first exhaust gas recirculation flow rate according to the total intake air flow rate and the fresh intake air amount; Obtaining the second pressure deviation amount upstream of the exhaust gas recirculation valve according to the first exhaust gas recirculation flow rate and the second exhaust gas recirculation flow rate calculated by the original exhaust gas recirculation model.

4. The water removal method of the pressure sensor according to claim 3, characterized in that, The engine further includes an oxygen sensor disposed in the exhaust pipeline; After the obtaining the throttle pressure ratio when it is monitored that the exhaust gas recirculation valve is in an open state, it further includes: When the obtained throttle pressure ratio is greater than the first preset value, obtaining the third pressure deviation amount upstream of the exhaust gas recirculation valve according to the signal change of the oxygen sensor.

5. The water removal method of the pressure sensor according to claim 1, characterized in that, The determining the water accumulation state of the pressure sensor according to the pressure deviation amount includes: When the pressure deviation amount is between a first threshold and a second threshold, determining that there is a small amount of accumulated water on the pressure sensor; Controlling the purging mechanism to purge the pressure sensor with a corresponding purging pressure according to the water accumulation state includes: Controlling the purging mechanism to purge the pressure sensor with a first purging pressure.

6. The water removal method of the pressure sensor according to claim 5, characterized in that, The determining the water accumulation state of the pressure sensor according to the pressure deviation amount includes: When the pressure deviation amount is between the second threshold value and the third threshold value, it is determined that the water storage amount on the pressure sensor is between a small amount and a serious amount; Controlling the purging mechanism to purge the pressure sensor with a corresponding purging pressure according to the water storage state includes: Controlling the purging mechanism to purge the pressure sensor with a second purging pressure.

7. The water removal method of the pressure sensor according to claim 6, characterized in that Determining the water storage state of the pressure sensor according to the pressure deviation amount includes: When the pressure deviation amount is greater than the third threshold value, it is determined that there is serious water storage on the pressure sensor; Controlling the purging mechanism to purge the pressure sensor with a corresponding purging pressure according to the water storage state includes: Controlling the purging mechanism to purge the pressure sensor with a third purging pressure; Wherein, the first threshold value, the second threshold value and the third threshold value increase in sequence, and the first purging pressure, the second purging pressure and the third purging pressure increase in sequence.

8. A water removal device for a pressure sensor, characterized in that, Comprising: An exhaust gas recirculation valve state monitoring module for monitoring the state of the exhaust gas recirculation valve; A pressure deviation amount determining module for determining the pressure deviation amount 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 for determining the water storage state of the pressure sensor according to the pressure deviation amount determined by the pressure deviation amount determining module; A purging mechanism control module for controlling the purging mechanism to purge the pressure sensor with a corresponding purging pressure according to the water storage state determined by the water storage state determining module.

9. A water removal system for a pressure sensor, characterized in that, Comprising a purging mechanism; The purging mechanism is used to purge the water storage on the pressure sensor.

10. An engine, characterized in that, Comprising an exhaust gas recirculation valve, a water removal system for the pressure sensor according to claim 9, and a throttle valve.

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