Control method and device for deflation valve of vehicle supercharger and vehicle

Abstract

The invention relates to the technical field of vehicle power, in particular to a deflation valve control method and device of a vehicle supercharger, a vehicle and a storage medium. The current pressure ratio and the current supercharger flow of the supercharger are calculated according to the current operation parameters, and the surge pressure ratio of the supercharger is obtained according to the current supercharger flow; and according to the surge pressure ratio and the current pressure ratio, the opening and closing action of a deflation valve of the supercharger is generated, so that the deflation valve is opened before surge of the supercharger occurs. Therefore, the problems that in the related technology, once the accelerator is loosened, even if surge does not occur, the deflation valve of the supercharger is opened, so that the deflation valve is abraded, the service life of the deflation valve is shortened, the energy consumption of the vehicle is increased, and long-term economy and reliability of the vehicle are not facilitated are solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle power technology, and in particular to a method and device for controlling an air release valve of a vehicle supercharger, and a vehicle. Background Art

[0002] The bleed valve is mainly used in vehicles equipped with turbochargers and is an important part of the turbocharger system. The main design purpose of the bleed valve is to prevent supercharger surge and to avoid a sudden decrease in vehicle air flow under certain operating conditions, which would lead to a sharp drop in supercharger efficiency. With the development of vehicle technology, the vehicle supercharger bleed valve has been upgraded from early mechanical control to electronic control, such as electric bleed valves, especially electric switch bleed valves, which have gradually become mainstream because they can achieve faster response and precise control.

[0003] In the related art, the control method of the electric switch type bleed valve is mostly to open the electric switch type bleed valve when the vehicle throttle is released. That is, when the vehicle throttle is released, the intake air demand of the vehicle engine decreases, but due to the inertia of the turbine blades, the turbine will continue to compress the air. The bleed valve opens when it detects that the pressure in the intake pipe exceeds the safety threshold, and quickly releases the excess compressed air, thereby protecting the turbocharger system from surging and maintaining the normal working pressure of the system.

[0004] However, when the vehicle throttle is released, the supercharger may not necessarily surge, so the action of opening the bleed valve is considered an invalid action, resulting in ineffective wear of the bleed valve, greatly reducing the service life of the bleed valve, wasting energy, reducing the applicability and reliability of the vehicle, and reducing customer stickiness. Summary of the invention

[0005] The present application provides a method and device for controlling a bleed valve of a vehicle supercharger, and a vehicle, so as to solve the problems in the related art that once the accelerator is released, the bleed valve of the supercharger is opened even when surge does not occur, causing the bleed valve to wear, shorten its service life, increase vehicle energy consumption, and be detrimental to the long-term economy and reliability of the vehicle.

[0006] A first aspect of the present application provides a method for controlling a bleed valve of a vehicle supercharger, comprising the following steps: obtaining current operating parameters of a vehicle supercharger; calculating a current pressure ratio and a current supercharger flow rate of the supercharger according to the current operating parameters, and obtaining a pressure ratio at which the supercharger surges according to the current supercharger flow rate; generating a switching action of a bleed valve of the supercharger according to the surge pressure ratio and the current pressure ratio, so as to open the bleed valve before the supercharger surges.

[0007] Through the above technical scheme, the embodiment of the present application can quickly calculate the pressure ratio based on the current operating parameters and compare it with the surge threshold, intelligently determine whether the air bleed valve needs to be opened, and achieve accurate and effective control of the air bleed valve, thereby avoiding the situation where the air bleed valve is opened when surge does not occur, reducing the wear of the air bleed valve, extending the service life of the air bleed valve, and improving the utilization efficiency of energy consumption.

[0008] Optionally, in one embodiment of the present application, obtaining the pressure ratio at which the supercharger surges according to the current supercharger flow rate includes: using the current supercharger flow rate as an index, querying a relationship table of flow rate-current supercharger operating condition surge pressure ratio, and obtaining the surge pressure ratio.

[0009] Through the above technical solution, the embodiment of the present application adopts a pre-established accurate flow-surge pressure ratio relationship table to accurately obtain the surge pressure ratio, improve the practicality and efficiency of the calculation, effectively improve the accuracy of surge judgment, and is simple and effective.

[0010] Optionally, in one embodiment of the present application, calculating the current pressure ratio and the current supercharger flow of the supercharger according to the current operating parameters includes: calculating the current pressure ratio according to the post-boosting pressure and the pre-boosting pressure of the current operating parameters; calculating the current supercharger flow according to the mass flow rate flowing through the supercharger, the exhaust temperature and the pre-turbine pressure of the current operating parameters.

[0011] Through the above technical solution, the embodiment of the present application directly uses the current operating parameters to calculate the pressure and supercharger flow in real time, improves the accuracy and real-time performance of the calculation, is more suitable for the current scenario, and is simple and reliable.

[0012] Optionally, in one embodiment of the present application, the switching action of generating the air bleed valve of the supercharger according to the surge pressure ratio and the current pressure ratio includes: obtaining a first reference value according to the surge pressure ratio and a first preset safety threshold; when the current pressure ratio is greater than or equal to the first reference value, the switching action is an opening action.

[0013] Through the above technical solution, the embodiment of the present application can accurately control the opening of the air release valve according to the comparison result of the real-time current pressure ratio and the first reference value, ensuring that the supercharger will not operate under an unsafe pressure ratio, avoiding failures that may be caused by excessive pressure or improper control, and improving the safety of operation.

[0014] Optionally, in an embodiment of the present application, it further includes: obtaining a second reference value according to the pressure ratio and a second preset safety threshold; and closing the air release valve when the current pressure ratio is less than or equal to the second reference value.

[0015] Through the above technical solution, the embodiment of the present application accurately controls the closing of the air release valve according to the comparison result between the current pressure ratio and the second reference value, thereby reducing unnecessary power consumption and wear of the air release valve and extending the service life of the air release valve.

[0016] A second aspect of the present application provides a purge valve control device for a vehicle supercharger, comprising: an acquisition module, used to acquire current operating parameters of a vehicle supercharger; a calculation module, used to calculate a current pressure ratio of the supercharger and a current supercharger flow rate according to the current operating parameters, and acquire a pressure ratio at which the supercharger surges according to the current supercharger flow rate; and a control module, used to generate a switching action of the purge valve of the supercharger according to the surge pressure ratio and the current pressure ratio, so as to open the purge valve before the supercharger surges.

[0017] Through the above technical scheme, the embodiment of the present application can quickly calculate the pressure ratio based on the current operating parameters and compare it with the surge threshold, intelligently determine whether the bleed valve needs to be opened, and achieve accurate and effective control of the bleed valve, avoiding the situation where the bleed valve is opened when surge does not occur, reducing the wear of the bleed valve, and improving the utilization efficiency of energy consumption, which is simple and effective.

[0018] Optionally, in an embodiment of the present application, the calculation module includes: a retrieval unit, which is used to query a relationship table of flow-current supercharger operating condition surge pressure ratio using the current supercharger flow as an index to obtain the pressure ratio.

[0019] Through the above technical solution, the embodiment of the present application adopts a pre-established accurate flow-surge pressure ratio relationship table to accurately obtain the surge pressure ratio, improve the practicality and efficiency of the calculation, and effectively improve the accuracy of surge judgment.

[0020] Optionally, in one embodiment of the present application, the calculation module includes: a first calculation unit, used to calculate the current pressure ratio according to the post-boost pressure and the pre-boost pressure of the current operating parameters; a second calculation unit, used to calculate the current supercharger flow according to the mass flow rate flowing through the supercharger, the exhaust temperature and the pre-turbine pressure of the current operating parameters.

[0021] Through the above technical solution, the embodiment of the present application directly uses the current operating parameters to calculate the pressure ratio and the supercharger flow in real time, thereby improving the accuracy and real-time performance of the calculation, being more in line with the current scenario, and being simple and reliable.

[0022] Optionally, in one embodiment of the present application, the control module includes: a third calculation unit, used to obtain a first reference value based on the surge pressure ratio and a first preset safety threshold; a first control unit, used to, when the current pressure ratio is greater than or equal to the first reference value, the switch action is an opening action.

[0023] Through the above technical solution, the embodiment of the present application can accurately control the opening of the air release valve according to the comparison result of the real-time current pressure ratio and the first reference value, ensuring that the supercharger will not operate under an unsafe pressure ratio, avoiding possible failures caused by excessive pressure or improper control, and improving the safety of operation.

[0024] Optionally, in one embodiment of the present application, the control module includes: a fourth calculation unit, used to obtain a second reference value based on the surge pressure ratio and a second preset safety threshold; a second control unit, used to close the bleed valve when the current pressure ratio is less than or equal to the second reference value.

[0025] Through the above technical solution, the embodiment of the present application accurately controls the closing of the air release valve according to the comparison result between the current pressure ratio and the second reference value, thereby reducing unnecessary power consumption and wear of the air release valve and extending the service life of the air release valve.

[0026] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle supercharger purge valve control method as described in the above embodiment.

[0027] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the program is executed by a processor, the above-mentioned method for controlling an air release valve of a vehicle supercharger is implemented.

[0028] A fifth aspect of the present application provides a computer program product, including a computer program, which, when executed, is used to implement the above-mentioned method for controlling an air release valve of a vehicle supercharger.

[0029] The embodiment of the present application can obtain the current operating parameters of the vehicle supercharger, and use the current operating parameters to calculate the current pressure ratio of the supercharger and the current supercharger flow rate. Furthermore, the critical pressure ratio of the impending or ongoing surge is obtained through the current supercharger flow rate, and the calculated current pressure ratio is compared with the surge critical pressure ratio. The opening and closing of the air release valve is controlled according to the comparison result. By accurately controlling the switching action of the air release valve, not only the energy consumption utilization rate is improved, but also the wear of the supercharger air release valve is reduced.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0032] Figure 1 A flow chart of a method for controlling an air release valve of a vehicle supercharger provided according to an embodiment of the present application;

[0033] Figure 2 is a schematic diagram of a characteristic curve of a vehicle supercharger according to an embodiment of the present application;

[0034] Figure 3 It is a flow chart of a method for controlling an air release valve of a vehicle supercharger according to a specific embodiment of the present application;

[0035] Figure 4 It is a structural schematic diagram of a purge valve control device for a vehicle supercharger provided according to an embodiment of the present application;

[0036] Figure 5 This is an example diagram of the structure of a vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0038] The following describes the bleed valve control method, device, and vehicle of the vehicle supercharger of the embodiment of the present application with reference to the accompanying drawings. In view of the problems in the related technologies mentioned in the above background technology, such as the waste of energy consumption, wear of the bleed valve, and shortened service life caused by opening the bleed valve when it is not necessary, which is not conducive to the long-term economy and reliability of the vehicle, the present application provides a bleed valve control method for a vehicle supercharger, in which the current operating parameters of the vehicle supercharger can be obtained, and the current pressure ratio and current supercharger flow of the supercharger can be calculated using the current operating parameters. Further, the critical boost ratio of the impending or ongoing surge is obtained through the current supercharger flow, and the calculated current boost ratio is compared with the surge critical boost ratio, and the opening and closing of the bleed valve is controlled according to the comparison result. By accurately controlling the switching action of the bleed valve, not only the utilization rate of energy consumption is improved, but also the wear of the supercharger bleed valve is reduced, and the service life of the bleed valve is extended. Thereby, the problem in the related art that once the accelerator is released, the bleed valve of the supercharger is opened even when surge does not occur, causing the bleed valve to wear, shortening its service life, increasing vehicle energy consumption, and being detrimental to the long-term economy and reliability of the vehicle is solved.

[0039] Specifically, Figure 1 A schematic flow chart of a method for controlling an air release valve of a vehicle supercharger provided in an embodiment of the present application.

[0040] like Figure 1 As shown, the air release valve control method of the vehicle supercharger includes the following steps:

[0041] In step S101 , current operating parameters of a supercharger of a vehicle are obtained.

[0042] It should be understood that the current operating parameters of the supercharger include but are not limited to: the pressure after supercharging P2, the pressure before supercharging P1, the pressure before the turbine P3, the exhaust temperature T3, and the mass flow rate m1 flowing through the supercharger (for the convenience of explanation, these parameters are summarized as the current operating parameters of the supercharger). The following is an explanation of the meaning of each term:

[0043] Pressure after boosting P2: The air pressure after being compressed by the turbocharger. The turbocharger improves combustion efficiency and engine power by increasing the air pressure entering the engine.

[0044] Pre-boost pressure P1: The air pressure before entering the turbocharger.

[0045] Turbine pre-pressure P3: refers to the exhaust gas pressure before the turbine (part of the turbocharger, driven by exhaust gas). This parameter can understand the utilization of exhaust gas energy and the operating status of the turbine.

[0046] Exhaust temperature T3: The temperature of the exhaust gases as they leave the turbine, an important indicator of the thermal efficiency of the turbocharger and the engine. High temperatures may indicate incomplete combustion or inefficient turbines, while lower temperatures may mean efficient energy recovery.

[0047] Mass flow rate m1 flowing through the turbocharger: the mass of air flowing through the turbocharger per unit time.

[0048] During the actual implementation process, the operating parameters of the vehicle's current supercharger can be obtained by corresponding sensors on the vehicle. For example, the post-boost pressure P2, the pre-boost pressure P1 and the pre-turbine pressure P3 can be obtained through a pressure sensor, the exhaust temperature T3 can be obtained through a temperature sensor (or an exhaust temperature model), and the mass flow m1 flowing through the supercharger can be obtained through a mass flow meter.

[0049] The embodiment of the present application continuously obtains the operating parameters of the current supercharger. By obtaining the operating parameters of multiple key superchargers, the real-time working status of the supercharger is fully and accurately understood, providing a reliable data basis for subsequent calculations and decisions, and improving the accuracy of subsequent data models.

[0050] In step S102, the current pressure ratio of the supercharger and the current supercharger flow rate are calculated according to the current operating parameters, and the pressure ratio at which the supercharger surges is obtained according to the current supercharger flow rate.

[0051] It is understood that the current pressure ratio can refer to the ratio of the air pressure at the supercharger outlet to the air pressure at the supercharger inlet (usually the atmosphere). A higher pressure ratio means that more air is compressed and sent to the engine, which can increase combustion efficiency and output power. Supercharger flow refers to the mass or volume of air passing through the supercharger per unit time. The size of the supercharger flow directly affects the intake volume of the engine, and then affects the performance and efficiency of the engine. Under a given supercharger flow, when the pressure ratio reaches a certain value, the supercharger may surge. The above content is elaborated in detail below.

[0052] Optionally, in one embodiment of the present application, a current pressure ratio of the supercharger and a current supercharger flow rate are calculated according to current supercharger operating parameters, including: calculating the current pressure ratio according to the post-boosting pressure and the pre-boosting pressure of the current supercharger operating parameters; calculating the current supercharger flow rate according to the mass flow rate flowing through the supercharger, the exhaust temperature and the pre-turbine pressure of the current supercharger operating parameters.

[0053] In the actual implementation process, the calculation formula for the current supercharger pressure ratio can be:

[0054] K1=P2 / P1

[0055] Among them, K1 is the current supercharger pressure ratio, P2 is the pressure after supercharging, and P1 is the pressure before supercharging.

[0056] Furthermore, the calculation formula of the current supercharger flow is:

[0057]

[0058] Among them, m2 is the current supercharger flow corrected by temperature and pressure, m1 is the mass flow through the supercharger, T3 is the exhaust temperature, and P3 is the pressure before the turbine.

[0059] Based on the above formula, the embodiment of the present application can obtain the current supercharger pressure ratio by the ratio of the pressure after supercharging to the pressure before supercharging. The higher the ratio, the better the compression effect of the supercharger on the air, that is, the greater the pressure increase of the air entering the engine. The influence of temperature and pressure is taken into account when calculating the current supercharger flow rate. It can be seen from the formula that under the same mass flow rate, the higher the exhaust temperature or the lower the pressure before the turbine, the larger the corrected flow rate will be. This is because the gas density under high temperature and low pressure conditions is smaller, and the volume of gas of the same mass is larger, so the amount of gas flowing through the supercharger is more in volume. The embodiment of the present application can effectively monitor and adjust the performance of the supercharger in real time according to the formula, so that the engine can reach the best working state under various operating conditions and improve the performance of the vehicle.

[0060] Optionally, in one embodiment of the present application, obtaining the pressure ratio of the supercharger at which surge occurs according to the current supercharger flow rate includes: using the current supercharger flow rate as an index, querying a relationship table of flow rate-current supercharger operating condition surge pressure ratio, and obtaining the surge pressure ratio.

[0061] It should be understood that the above flow rate-current supercharger operating condition surge pressure ratio relationship table can be obtained through, but not limited to, experimental tests. The characteristic curve of the supercharger obtained by the current supercharger pressure ratio K1 and the current supercharger flow rate is as follows: Figure 2 As shown. Figure 2 It can be seen that the ordinate of the characteristic curve is the current supercharger pressure ratio K1, and the abscissa is the current supercharger flow m2 corrected by temperature and pressure. Each mark (nt) reflects the performance of the supercharger at a specific speed. The surge line divides the graph into different areas. The right side of the surge line is the stable area. When the operating point approaches or crosses the surge line and reaches the area on the left side of the surge line, the supercharger may experience unstable surge, that is, the vent valve needs to be opened.

[0062] The flow rate-current supercharger operating condition surge pressure ratio relationship table obtained from this characteristic curve is shown in Table 1. Table 1 is the flow rate-current supercharger operating condition surge pressure ratio relationship table, as shown below.

[0063] Table 1

[0064] m2(kg / s)K^0.5 / kPa 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 <![CDATA[Surge pressure ratio (K thr )]]> 1.1 1.2 1.6 2.2 2.4 3 3.1 3.2

[0065] It can be seen from the information in Table 1 that in some embodiments, when the flow rate m2 is 0.15, the surge pressure ratio is 2.2. This means that at this flow rate, when the pressure ratio of the supercharger exceeds 2.2, it may enter the surge region and become unstable.

[0066] The embodiment of the present application calculates the supercharger pressure ratio and flow rate in real time, instantly identifies the operating status of the supercharger, and accurately predicts the supercharger's operating condition close to surge, so as to facilitate subsequent intervention before surge occurs, avoid premature or late intervention, and optimize the overall performance of the supercharger.

[0067] In step S103, a switch action of the purge valve of the supercharger is generated according to the surge pressure ratio and the current pressure ratio, so as to open the purge valve before the supercharger surges.

[0068] It should be understood that the switch action of the bleed valve of the supercharger is generated according to the surge pressure ratio and the current pressure ratio, which can be understood as comparing the current pressure ratio with the set safety threshold. According to the comparison result, when the supercharger surges, the bleed valve is controlled to open, and when the supercharger is in the stable zone, the bleed valve remains closed. That is, when the bleed valve detects that the current pressure ratio exceeds the safety threshold, the vehicle's control system will control the bleed valve to open, so that part of the compressed air is released directly from the bleed valve to the front of the supercharger without entering the combustion chamber. In this way, the pressure in the intake pipe can be quickly reduced to avoid surge. Once the pressure ratio returns to the safe range, that is, the supercharger operates in the stable zone, the vehicle's control system will control the bleed valve to close to prevent unnecessary compressed air loss and improve engine efficiency. By accurately controlling the switch of the bleed valve, the engine performance is improved, the wear of the bleed valve is reduced, and the service life of the bleed valve is extended.

[0069] Optionally, in one embodiment of the present application, a switching action of a bleed valve of a supercharger is generated according to a surge pressure ratio and a current pressure ratio, including: obtaining a first reference value according to the surge pressure ratio and a first preset safety threshold; and when the current supercharger ratio is greater than or equal to the first reference value, the switching action is an opening action.

[0070] It can be understood that the first reference value is the pressure ratio value at which the supercharger is about to surge, and the condition for opening the purge valve is that the current supercharger pressure ratio is greater than or equal to the first reference value, and the formula is as follows:

[0071] K1≥K thr -K d1

[0072] Among them, K1 is the current supercharger pressure ratio, K thr is the surge pressure ratio of the current flow, K d1 The first preset safety threshold. K d1 It can be obtained from Table 2, which shows the flow rate-K d1 The relationship table is shown below.

[0073] Table 2

[0074] m2(kg / s)K^0.5 / kPa 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 Kd1 0.05 0.06 0.08 0.11 0.12 0.15 0.14 0.16

[0075] In actual implementation, when it is monitored that K1 reaches or exceeds the first reference value, the embodiment of the present application determines that the supercharger is about to surge and activates anti-surge measures, that is, opens the air valve to reduce the amount of air after supercharging, thereby reducing the pressure to avoid the occurrence of surge.

[0076] Optionally, in one embodiment of the present application, generating a switching action of a bleed valve of a supercharger according to a surge pressure ratio and a current pressure ratio further includes: obtaining a second reference value according to the surge pressure ratio and a second preset safety threshold; and closing the bleed valve when the current pressure ratio is less than or equal to the second reference value.

[0077] It can be understood that the second reference value is given by formula K thr -K d2 It is concluded that K thr is the surge pressure ratio at the current flow rate, K d2 is the second preset safety threshold. d2 It can be obtained from Table 3, which shows the flow rate-K d2 The relationship table is shown below.

[0078] Table 3

[0079] m2(kg / s)K^0.5 / kPa 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 <![CDATA[K d2 ]]> 0.08 0.1 0.14 0.2 0.22 0.28 0.3 0.31

[0080] In actual implementation, the bleed valve automatically opens when the boost pressure is detected to be too high to release the excess pressure. After the bleed valve is opened, the embodiment of the present application will continue to monitor K1. If the value of K1 drops below the second reference value, it indicates that the pressure has been effectively controlled and is no longer at risk of surging.

[0081] In this case, the embodiment of the present application can start a delay program, usually with a delay time set to 0.5 seconds. This delay is to ensure that the pressure of the supercharger is stabilized and to avoid pressure fluctuations caused by the rapid closing of the bleed valve. After the delay, the vehicle's control system controls the bleed valve to close and restores the supercharger to a normal boost state. While effectively preventing surge, it avoids unnecessary bleed, optimizes fuel efficiency and reduces wear on the bleed valve.

[0082] Combination Figure 3 As shown, the working principle of the vehicle supercharger exhaust valve control method of the present application embodiment is described in detail with an embodiment. Figure 3 As shown, the control steps of the exhaust valve of the vehicle supercharger are as follows:

[0083] Step S301: Obtain current operating parameters of the supercharger.

[0084] The current operating parameters of the supercharger include, but are not limited to: the pressure after supercharging P2, the pressure before supercharging P1, the pressure before the turbine P3, the exhaust temperature T3, and the mass flow rate m1 flowing through the supercharger.

[0085] Step S302: Calculate the current supercharger pressure ratio K1.

[0086] The formula for calculating the current supercharger pressure ratio is: K1 = P2 / P1

[0087] Step S303: Calculate the current supercharger flow rate.

[0088] The formula for calculating the current booster flow is:

[0089] Step S304: Look up the table to calculate the current supercharger operating condition surge pressure ratio K thr .

[0090] Current turbocharger operating condition surge pressure ratio K thr It can be obtained by querying the flow rate-current supercharger operating condition surge pressure ratio relationship table.

[0091] Step S305: K1≥K thr -K d1 .

[0092] Judgment condition: The current supercharger pressure ratio K1 is greater than or equal to the current supercharger operating condition surge pressure ratio K thr If yes, execute step S305, otherwise execute step S301.

[0093] Step S306: the air release valve is opened.

[0094] If the judgment condition of step S305 is met, the switch action of the purge valve of the supercharger is that the control system of the vehicle controls the purge valve to open.

[0095] Step S307: K1≤K thr -K d2 .

[0096] Judgment condition: The current supercharger pressure ratio K1 is less than or equal to the current supercharger operating condition surge pressure ratio K thr If yes, execute step S308, otherwise execute step S301.

[0097] Step S308: the air release valve is closed.

[0098] If the judgment condition of step S307 is met, the embodiment of the present application controls the air release valve to close.

[0099] In the actual implementation process, the sensor on the vehicle obtains the operating parameters of the current supercharger, which include but are not limited to the post-supercharging pressure, the pre-supercharging pressure, the turbine pre-pressure (or model calculation), the exhaust temperature (or model calculation), and the mass flow rate flowing through the supercharger. The embodiment of the present application uses the above formula to calculate the current supercharger pressure ratio and the current supercharger flow rate respectively, and the supercharger characteristic curve is obtained based on the current supercharger flow rate, the supercharger pressure ratio and the speed under different working conditions, and then the surge pressure ratio table under the current supercharger flow rate can be obtained. The supercharger pressure ratio that surges under the current working condition can be obtained by querying this table, and the supercharger pressure ratio under the current working condition is compared with the first reference value. If the supercharger pressure ratio is greater than or equal to the first reference value, the vent valve is opened.

[0100] In some cases, after the purge valve is opened for a certain period of time, the pressure ratio of the supercharger drops below the second reference value, and the embodiment of the present application closes the purge valve to reduce energy loss.

[0101] The embodiment of the present application compares the current supercharger pressure ratio with the calculated reference value to achieve dynamic control of the air release valve, avoid surge, and keep the air release valve closed during stable operation, thereby reducing energy loss, reducing wear on the air release valve, and extending the service life of the air release valve.

[0102] According to the air bleed valve control method for a vehicle supercharger proposed in an embodiment of the present application, the current operating parameters of the vehicle supercharger can be obtained, and the current pressure ratio of the supercharger and the current supercharger flow rate can be calculated using the current operating parameters. Furthermore, the critical boost ratio for an impending or currently surging condition can be obtained using the current supercharger flow rate, and the calculated current boost ratio and the surge critical boost ratio can be compared. The opening and closing of the air bleed valve can be controlled based on the comparison result. By accurately controlling the switching action of the air bleed valve, not only the energy consumption utilization rate is improved, but also the wear of the supercharger air bleed valve can be reduced, thereby extending the service life of the air bleed valve.

[0103] Next, the exhaust valve control device of a vehicle supercharger according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0104] Figure 4 4 is a block diagram of a purge valve control device for a vehicle supercharger according to an embodiment of the present application.

[0105] like Figure 2 As shown, the purge valve control device 10 of the vehicle supercharger includes: an acquisition module 100 , a calculation module 200 and a control module 300 .

[0106] Specifically, the acquisition module 100 is used to acquire current operating parameters of the supercharger of the vehicle.

[0107] The calculation module 200 is used to calculate the current supercharger pressure ratio and the current supercharger flow rate of the supercharger according to the current operating parameters, and obtain the pressure ratio at which the supercharger surges according to the current supercharger flow rate.

[0108] The control module 300 is used to generate a switching action of the purge valve of the supercharger according to the supercharger ratio and the current supercharger ratio, so as to open the purge valve when the supercharger surges.

[0109] Optionally, in one embodiment of the present application, the calculation module 200 includes: a retrieval unit, which is used to query the relationship table of flow-current supercharger operating condition surge pressure ratio by taking the current supercharger flow as an index to obtain the surge pressure ratio.

[0110] Optionally, in one embodiment of the present application, the calculation module 200 includes: a first calculation unit and a second calculation unit.

[0111] The first calculation unit is used to calculate the current supercharger ratio according to the post-boosting pressure and the pre-boosting pressure of the current operating parameters.

[0112] The second calculation unit is used to calculate the current supercharger flow rate according to the mass flow rate flowing through the supercharger, the exhaust temperature and the turbine inlet pressure of the current operating parameters.

[0113] Optionally, in one embodiment of the present application, the control module 300 includes: a third calculation unit and a first control unit.

[0114] Wherein, the third calculation unit is used to obtain a first reference value according to the surge pressure ratio and the first preset safety threshold.

[0115] The first control unit is used for, when the current supercharger ratio is greater than or equal to the first reference value, the switch action is an opening action.

[0116] Optionally, in one embodiment of the present application, the control module 300 includes: a fourth calculation unit and a second control unit.

[0117] The fourth calculation unit is used to obtain a second reference value according to the surge pressure ratio and the second preset safety threshold.

[0118] The second control unit is used to close the purge valve when the current supercharger ratio is less than or equal to a second reference value.

[0119] It should be noted that the above explanation of the embodiment of the air release valve control method of a vehicle supercharger is also applicable to the air release valve control device of a vehicle supercharger of this embodiment, and will not be repeated here.

[0120] According to the air bleed valve control device of a vehicle supercharger proposed in the embodiment of the present application, the current operating parameters of the vehicle supercharger can be obtained, and the current pressure ratio of the supercharger and the current supercharger flow rate can be calculated using the current operating parameters. Furthermore, the critical boost ratio for an impending or currently surging condition can be obtained using the current supercharger flow rate, and the calculated current boost ratio and the surge critical boost ratio can be compared. The opening and closing of the air bleed valve can be controlled based on the comparison result. By accurately controlling the switching action of the air bleed valve, not only the energy consumption utilization rate is improved, but also the wear of the supercharger air bleed valve can be reduced, thereby extending the service life of the air bleed valve.

[0121] Figure 5 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0122] A memory 501 , a processor 502 , and a computer program stored in the memory 501 and executable on the processor 502 .

[0123] When the processor 502 executes the program, the purge valve control method of the vehicle supercharger provided in the above embodiment is implemented.

[0124] Furthermore, the vehicle also includes:

[0125] The communication interface 503 is used for communication between the memory 501 and the processor 502 .

[0126] The memory 501 is used to store computer programs that can be executed on the processor 502 .

[0127] The memory 501 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0128] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0129] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can communicate with each other through an internal interface.

[0130] The processor 502 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0131] The embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the above-mentioned method for controlling the exhaust valve of a vehicle supercharger is implemented.

[0132] The embodiment of the present application also provides a computer program product, including a computer program, which is used to implement the above-mentioned vehicle supercharger purge valve control method when executed.

[0133] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0134] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0135] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0136] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0137] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0138] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0139] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0140] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for controlling an air release valve of a vehicle supercharger, characterized in that: The following steps are involved: Obtaining current operating parameters of the vehicle's supercharger; Calculating a current pressure ratio of the supercharger and a current supercharger flow rate according to the current operating parameters, and obtaining a pressure ratio at which the supercharger surges according to the current supercharger flow rate; A switching action of the purge valve of the supercharger is generated according to the surge pressure ratio and the current pressure ratio, so as to open the purge valve before surge occurs in the supercharger.

2. The method according to claim 1, characterized in that The step of obtaining the pressure ratio at which the supercharger surges according to the current supercharger flow rate includes: The current supercharger flow rate is used as an index to query a relationship table of flow rate-current supercharger operating condition surge pressure ratio to obtain the surge pressure ratio.

3. The method according to claim 1, characterized in that The calculating the current pressure ratio and the current supercharger flow rate of the supercharger according to the current operating parameters includes: Calculating the current pressure ratio according to the post-boosting pressure and the pre-boosting pressure of the current operating parameter; The current supercharger flow rate is calculated according to the mass flow rate flowing through the supercharger, the exhaust temperature and the turbine inlet pressure of the current operating parameters.

4. The method according to claim 1, characterized in that: The step of generating a switch action of the purge valve of the supercharger according to the surge pressure ratio and the current pressure ratio includes: obtaining a first reference value according to the supercharger ratio and a first preset safety threshold; When the current pressure ratio is greater than or equal to the first reference value, the switch action is an opening action.

5. The method according to claim 1 or 4, characterized in that: Also includes: obtaining a second reference value according to the supercharger ratio and a second preset safety threshold; When the current pressure ratio is less than or equal to the second reference value, the purge valve is closed.

6. A vent valve control device for a vehicle supercharger, characterized in that: include: An acquisition module, used for acquiring current operating parameters of a supercharger of a vehicle; a calculation module, configured to calculate a current pressure ratio of the supercharger and a current supercharger flow rate according to the current operating parameters, and to obtain a pressure ratio at which the supercharger surges according to the current supercharger flow rate; The control module is used to generate a switch action of the air release valve of the supercharger according to the surge pressure ratio and the current pressure ratio, so as to open the air release valve before the supercharger surges.

7. The device according to claim 6, characterized in that The calculation module comprises: A first calculation unit, configured to calculate the current pressure ratio according to the post-boosting pressure and the pre-boosting pressure of the current operating parameter; The second calculation unit is used to calculate the current supercharger flow rate according to the mass flow rate flowing through the supercharger, the exhaust temperature and the turbine inlet pressure of the current operating parameters.

8. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the purge valve control method for a vehicle supercharger according to any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the purge valve control method of a vehicle supercharger as claimed in any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that The computer program is executed to implement the purge valve control method of a vehicle supercharger according to any one of claims 1 to 5.

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