Engine system and control method and control device therefor

Abstract

The application discloses an engine system and a control method and a control device thereof. The control method comprises the following steps: determining a closed-loop control mode of an exhaust throttle valve; if the closed-loop control mode of the exhaust throttle valve is an air intake amount control mode, determining a first air intake flow according to a first oxygen concentration collected by a first oxygen concentration sensor, and performing closed-loop control on the exhaust throttle valve according to the first air intake flow; if the closed-loop control mode of the exhaust throttle valve is a pressure control mode, determining a first pressure deviation according to first pressure data collected by a first pressure sensor, and performing closed-loop control on the exhaust throttle valve according to the first pressure deviation. In the application, the closed-loop control mode of the exhaust throttle valve has multiple modes, so if one of the closed-loop control modes fails or is not accurate, the closed-loop control on the exhaust throttle valve can be performed by using other closed-loop control modes, so that the normal operation of the engine system can be ensured, and the reliability and control precision of the exhaust throttle valve control are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine, in particular to an engine system and a control method and device thereof. BACKGROUND

[0002] The engine (for example, diesel engine) comprises an exhaust throttle valve (ETV) installed in an exhaust passage of the engine. The exhaust throttle valve functions to adjust the exhaust gas flow rate by changing the opening degree of the exhaust throttle valve so that the treated exhaust gas meets the requirements of national regulations.

[0003] At present, the opening degree of the exhaust throttle valve is controlled by a motor. If a fault occurs, it may result in a large error in the opening degree of the exhaust throttle valve, affecting the normal use of the engine. SUMMARY

[0004] The present application provides an engine system and a control method and device thereof to improve the control reliability of the exhaust throttle valve.

[0005] According to an aspect of the present application, a control method of an engine system is provided, the engine system comprising an engine, a first oxygen concentration sensor installed on the exhaust side of the engine, an exhaust throttle valve and a first pressure sensor;

[0006] The control method comprises:

[0007] determining a closed-loop control mode of the exhaust throttle valve;

[0008] if the closed-loop control mode of the exhaust throttle valve is an intake amount control mode, determining a first intake flow rate according to a first oxygen concentration collected by the first oxygen concentration sensor, and performing closed-loop control on the exhaust throttle valve according to the first intake flow rate;

[0009] if the closed-loop control mode of the exhaust throttle valve is a pressure control mode, determining a first pressure deviation according to first pressure data collected by the first pressure sensor, and performing closed-loop control on the exhaust throttle valve according to the first pressure deviation.

[0010] Further, the determination of the closed-loop control mode of the exhaust throttle valve comprises:

[0011] under a steady state condition of the engine, determining the first intake flow rate according to the first oxygen concentration collected by the first oxygen concentration sensor;

[0012] if the first intake flow rate is greater than or equal to a first intake threshold value, entering the intake amount control mode; or if the first intake flow rate is less than the first intake threshold value, entering the pressure control mode.

[0013] Further, determining the first intake air flow according to the first oxygen concentration collected by the first oxygen concentration sensor comprises:

[0014] M A = M F *(X O +K A ) / (K B -X O );

[0015] wherein M A is the first intake air flow, M F is the fuel consumption data of the engine, X O is the first oxygen concentration, K A and K B are constants related to oxygen concentration and intake air flow.

[0016] Further, the closed-loop control of the exhaust throttle valve according to the first intake air flow comprises:

[0017] calculating the difference between the first intake air flow and a target intake air flow to obtain a first intake air deviation, and controlling the exhaust throttle valve according to the first intake air deviation.

[0018] Further, determining the first pressure deviation according to the first pressure data collected by the first pressure sensor comprises:

[0019] calculating the difference between the first pressure data and a target pressure value to obtain a first pressure deviation, and controlling the exhaust throttle valve according to the first pressure deviation.

[0020] Further, the intake air control mode further comprises:

[0021] determining a second intake air flow according to intake air side information collected by an intake air side sensor;

[0022] controlling the exhaust throttle valve according to the first intake air flow and the second intake air flow.

[0023] Further, the closed-loop control of the exhaust throttle valve according to the first intake air flow and the second intake air flow comprises:

[0024] calculating the difference between the first intake air flow and a target intake air flow to obtain a first intake air deviation, and calculating the difference between the second intake air flow and the target intake air flow to obtain a second intake air deviation;

[0025] controlling the exhaust throttle valve according to the average of the first intake air deviation and the second intake air deviation.

[0026] According to another aspect of the present application, there is provided a control device of an engine system, the engine system comprising an engine, a first oxygen concentration sensor installed on an exhaust side of the engine, an exhaust throttle valve, and a first pressure sensor;

[0027] The control device comprises:

[0028] a mode selection module for determining a closed-loop control mode of the exhaust throttle valve;

[0029] a first control module for determining a first intake flow rate according to a first oxygen concentration acquired by the first oxygen concentration sensor when the closed-loop control mode of the exhaust throttle valve is an intake amount control mode, and performing closed-loop control on the exhaust throttle valve according to the first intake flow rate;

[0030] a second control module for determining a first pressure deviation according to first pressure data acquired by the first pressure sensor when the closed-loop control mode of the exhaust throttle valve is a pressure control mode, and performing closed-loop control on the exhaust throttle valve according to the first pressure deviation.

[0031] According to another aspect of the present application, there is provided an engine system comprising the control device as described above;

[0032] The engine system further comprises an engine, a first oxygen concentration sensor installed on an exhaust side of the engine, an exhaust throttle valve, and a first pressure sensor;

[0033] The control device is electrically connected to the first oxygen concentration sensor, the exhaust throttle valve, and the first pressure sensor, respectively.

[0034] Further, the engine system further comprises a turbine;

[0035] The exhaust throttle valve is located between the turbine and the first oxygen concentration sensor, and the exhaust throttle valve is arranged on an output side of the turbine.

[0036] The first oxygen concentration sensor and the first pressure sensor are installed on the exhaust side of the engine; if it is determined that the closed-loop control mode of the exhaust throttle valve is the intake air amount control mode, the first oxygen concentration sensor collects the oxygen concentration of the exhaust passage to obtain a first oxygen concentration, the first intake air flow is calculated according to the first oxygen concentration, and the closed-loop control of the exhaust throttle valve is performed according to the first intake air flow; if it is determined that the closed-loop control mode of the exhaust throttle valve is the pressure control mode, the first pressure sensor collects the pressure of the exhaust passage to obtain first pressure data, the first pressure deviation is determined according to the first pressure data, and the closed-loop control of the exhaust throttle valve is performed according to the first pressure deviation. In the application, there are multiple closed-loop control modes of the exhaust throttle valve, so if one of the closed-loop control modes fails or is not accurately controlled, the closed-loop control of the exhaust throttle valve can be performed by using other closed-loop control modes, so that the normal operation of the engine system can be ensured, and the reliability and control accuracy of the exhaust throttle valve control are improved.

[0037] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the application, nor is it used to limit the scope of the application. Other features of the application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0039] Figure 1 is a schematic diagram of an engine system provided by an embodiment of the application;

[0040] Figure 2 is a schematic diagram of a control method of an engine system provided by an embodiment of the application;

[0041] Figure 3 is a schematic diagram of a control device provided by an embodiment of the application;

[0042] Figure 4 is a schematic diagram of an electronic device provided by an embodiment of the application. DETAILED DESCRIPTION

[0043] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work should belong to the protection scope of the present application.

[0044] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a list of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products or devices.

[0045] Figure 1 is a schematic diagram of an engine system provided by an embodiment of the present application, as shown in Figure 1 The engine system includes a control device 101, and further includes an engine 102, a first oxygen concentration sensor 103 installed on an exhaust side of the engine 102, an exhaust throttle valve 104, and a first pressure sensor 105. The control device 101 is electrically connected to the first oxygen concentration sensor 103, the exhaust throttle valve 104, and the first pressure sensor 105, respectively. Optionally, the engine system further includes a turbine 106. The exhaust throttle valve 104 is located between the turbine 106 and the first oxygen concentration sensor 103, and the exhaust throttle valve 104 is arranged on an output side of the turbine 106.

[0046] In the embodiment, the engine system includes the control device 101, which communicates with each component in the engine system. The control device 101 receives signals of the components in the engine system and processes the signals, and then applies control signals to the components in the engine system to make the engine system operate normally.

[0047] The engine system comprises an engine 102, the engine 102 comprising an intake side and an exhaust side, the intake side of the engine 102 can be understood as the front processing of the engine, and the exhaust side of the engine 102 can be understood as the rear processing of the engine. The intake side of the engine 102 comprises an intake passage through which gas enters the engine 102. The exhaust side of the engine 102 comprises an exhaust passage through which the gas processed by the engine 102 is output.

[0048] The exhaust side of the engine 102 comprises a first oxygen concentration sensor 103, an exhaust throttle valve 104, a first pressure sensor 105 and a turbine 106 installed in the exhaust passage.

[0049] The optional first pressure sensor 105 is installed between the engine 102 and the turbine 106, specifically, the first pressure sensor 105 is installed between the exhaust port of the engine 102 and the input side of the turbine 106. The installation position of the optional first pressure sensor 105 is close to the exhaust port of the engine 102, and the first pressure sensor 105 is used to detect the pressure in the exhaust passage. Since the first pressure sensor 105 is installed at the input side of the turbine 106, the pressure data collected by the first pressure sensor 105 is the pre-turbine exhaust pressure. It can be understood that the installation position of the first pressure sensor is not limited to Figure 1 As shown, the installation position of the first pressure sensor can be reasonably designed as long as the product allows, and then the pressure data detected by the first pressure sensor represents the pressure in the exhaust passage at the installation position thereof.

[0050] The optional first oxygen concentration sensor 103 and the exhaust throttle valve 104 are both installed at the output side of the turbine 106, specifically, the exhaust throttle valve 104 is installed between the output side of the turbine 106 and the first oxygen concentration sensor 103. The opening degree change of the exhaust throttle valve 104 will affect the gas flow in the exhaust passage. The first oxygen concentration sensor 103 is used to detect the oxygen concentration in the exhaust passage. It can be understood that the installation positions of the first oxygen concentration sensor and the exhaust throttle valve are not limited to Figure 1 As shown, the installation positions of the first oxygen concentration sensor and the exhaust throttle valve can be reasonably designed as long as the product allows; for example, the first oxygen concentration sensor is installed at the input side of the turbine, or the exhaust throttle valve is installed at the input side of the turbine, etc.

[0051] The control device 101 is electrically connected to the first oxygen concentration sensor 103, the exhaust throttle valve 104 and the first pressure sensor 105 respectively. The control device 101 can obtain the oxygen concentration collected by the first oxygen concentration sensor 103, and can obtain the pressure data collected by the first pressure sensor 105. After analyzing and processing the signals of the components in the engine system, the control device 101 can control the opening degree of the exhaust throttle valve 104 to make the operating condition of the engine system meet the requirements. The control device 101 includes a microcontroller, a single-chip microcomputer or other devices that can perform data operation and processing. The control device 101 can be integrated in the vehicle controller ECU.

[0052] The intake side of the optional engine 102 includes one or more intake side sensors installed in the intake passage, and the optional intake side sensors include a temperature and pressure sensor 107. The temperature and pressure sensor 107 is installed close to the air inlet of the engine 102, and can detect the temperature and pressure in the intake passage as an independent sensor. In other embodiments, the temperature sensor and the pressure sensor can be independent of each other, and the intake side of the engine includes a plurality of intake side sensors, including a temperature sensor and a pressure sensor. The installation position of the temperature and pressure sensor 107 is not limited to Figure 1 As shown in the figure, the installation position of the temperature and pressure sensor can be reasonably designed as long as the product allows, and then the temperature and pressure data detected by the temperature and pressure sensor represent the temperature and pressure in the intake passage at the installation position thereof.

[0053] Figure 2 is a schematic diagram of a control method of an engine system provided by an embodiment of the present application. The embodiment can be applicable to the closed-loop control of the exhaust throttle valve of a vehicle. The control method can be executed by a control device, which can be realized in the form of hardware and / or software. The control device can be configured in the engine system, which can be the engine system of any vehicle. In the embodiment, the optional control device and the engine system are not limited to Figure 1 As shown in the figure.

[0054] As shown in the figure, Figure 2 The control method includes:

[0055] Step 210, determining the closed-loop control mode of the exhaust throttle valve;

[0056] Step 220, if the closed-loop control mode of the exhaust throttle valve is the intake amount control mode, determining the first intake flow rate according to the first oxygen concentration collected by the first oxygen concentration sensor, and performing closed-loop control on the exhaust throttle valve according to the first intake flow rate;

[0057] If the closed-loop control mode of the exhaust throttle valve is the pressure control mode, a first pressure deviation is determined according to the first pressure data collected by the first pressure sensor, and the closed-loop control of the exhaust throttle valve is performed according to the first pressure deviation.

[0058] In the embodiment, the closed-loop control mode of the exhaust throttle valve has multiple modes. If one of the closed-loop control modes fails, such as a sensor failure or inaccurate data collection, another closed-loop control mode can be used, so that the normal operation of the engine system can be ensured, and the reliability and accuracy of the control of the exhaust throttle valve are improved.

[0059] Specifically, the closed-loop control mode of the exhaust throttle valve includes at least an intake amount control mode and a pressure control mode. The intake amount control mode is to perform the closed-loop control of the exhaust throttle valve according to the intake flow rate, and the pressure control mode is to perform the closed-loop control of the exhaust throttle valve according to the pressure in the exhaust passage. It can be understood that, under the condition of ensuring the normal closed-loop control of the exhaust throttle valve, the closed-loop control mode of the exhaust throttle valve can also include other modes, and is not limited to the intake amount control mode of performing the closed-loop control of the exhaust throttle valve according to the intake flow rate, and is not limited to the pressure control mode of performing the closed-loop control of the exhaust throttle valve according to the pressure in the exhaust passage. The closed-loop control described herein is a control method using PID parameter adjustment, that is, comparing the output feedback value with the input set value, and making them infinitely close through PID parameter adjustment.

[0060] The closed-loop control mode of the exhaust throttle valve can be determined according to the priority of multiple different control modes preset in the control device, and the required closed-loop control mode is determined according to the priority. When the closed-loop control mode with high priority fails, or has a large error, or the sensor drifts and fails, the next closed-loop control mode is sequentially determined as the required closed-loop control mode. For example, the priority of the pressure control mode is higher than that of the intake amount control mode in the control device, so that the pressure control mode is used by default to perform the closed-loop control of the exhaust throttle valve under normal conditions. However, when the pressure control mode fails, such as the sensor collecting signals being damaged, the intake amount control mode is sequentially used to perform the closed-loop control of the exhaust throttle valve.

[0061] Setting the priority is only a simple mechanical determination of the closed-loop control mode of the exhaust throttle valve. In the present application, other ways of determining the closed-loop control mode of the exhaust throttle valve can also be used.

[0062] Optionally, the closed-loop control mode of the exhaust throttle valve is determined as follows: under the steady state condition of the engine, a first intake flow rate is determined according to the first oxygen concentration collected by the first oxygen concentration sensor; if the first intake flow rate is greater than or equal to a first intake threshold value, the intake amount control mode is entered; or if the first intake flow rate is less than the first intake threshold value, the pressure control mode is entered.

[0063] In the embodiment, the first intake flow rate can also be used as a judgment basis when the engine is in a steady state condition. When the first intake flow rate is less than the first intake threshold value, it indicates that the intake flow rate is small, and if the intake amount control mode is used, the small intake flow rate will result in poor control accuracy. When the first intake flow rate is greater than or equal to the first intake threshold value, it indicates that the intake flow rate is large, and if the intake amount control mode is used, the large intake flow rate is conducive to subsequent adjustment, and the control accuracy can be improved. Therefore, if the first intake flow rate is less than the first intake threshold value, the pressure control mode is entered.

[0064] It should be noted that the control method shown in the embodiment can improve the closed-loop control accuracy of the exhaust throttle valve in the steady state condition of the engine. However, it is not limited thereto, and the control method shown in the embodiment can also be executed in a non-steady state condition under the circumstances required by the product. Figure 2

[0065] It can be understood that if the first intake flow rate is greater than or equal to the first intake threshold value, the intake amount control mode is entered, and in the intake amount control mode, the first intake flow rate obtained can be directly used to perform closed-loop control on the exhaust throttle valve, and it is not necessary to calculate the first intake flow rate again.

[0066] If the closed-loop control mode of the exhaust throttle valve is the intake amount control mode, it is necessary to determine the first intake flow rate, and the first intake flow rate described herein is the actual intake flow rate. Specifically, the first oxygen concentration sensor collects the oxygen concentration of the exhaust passage to obtain the first oxygen concentration, and the first oxygen concentration is the oxygen concentration of the exhaust passage after the exhaust throttle valve. Then, the first intake flow rate is calculated according to the first oxygen concentration. Then, the exhaust throttle valve is controlled based on the first intake flow rate, and specifically, the opening degree of the exhaust throttle valve is increased or decreased according to the change of the first intake flow rate.

[0067] ​Optionally, the closed-loop control of the exhaust throttle valve according to the first intake flow rate comprises: calculating the difference between the first intake flow rate and a target intake flow rate to obtain a first intake deviation, and controlling the exhaust throttle valve according to the first intake deviation. The target intake flow rate is the calibration intake flow rate corresponding to the engine system in the current driving cycle. It can be understood that the target intake flow rate can be different in different driving conditions. Obviously, the smaller the difference between the first intake flow rate and the target intake flow rate, the closer the first intake flow rate is to the calibration intake flow rate corresponding to the engine system in the current driving cycle; the greater the difference between the first intake flow rate and the target intake flow rate, the greater the degree of deviation of the first intake flow rate from the calibration intake flow rate corresponding to the engine system in the current driving cycle. According to the degree of deviation of the first intake flow rate from the calibration intake flow rate corresponding to the engine system in the current driving cycle, the opening of the exhaust throttle valve is adjusted so that the difference between the first intake flow rate and the target intake flow rate is within the allowable error range. Specifically, the control device pre-stores the calibration intake flow rate of the engine system corresponding to each driving condition and the allowable error range. The control device obtains the calibration intake flow rate of the engine system corresponding to the current driving condition as the target intake flow rate according to the current driving condition.

[0068] If the closed-loop control mode of the exhaust throttle valve is the pressure control mode, the first pressure data needs to be determined, wherein the first pressure data is the pressure of the exhaust passage. Specifically, the first pressure sensor collects the pressure of the exhaust passage to obtain the first pressure data; then the first pressure deviation is obtained according to the comparison between the first pressure data and the target pressure data; and then the exhaust throttle valve is controlled according to the first pressure deviation, specifically the opening of the exhaust throttle valve is increased or decreased according to the change of the size of the first pressure deviation.

[0069] Optionally, the first pressure deviation is determined according to the first pressure data collected by the first pressure sensor, and the first pressure deviation comprises: calculating a difference between the first pressure data and a target pressure value to obtain the first pressure deviation, and performing closed-loop control on the exhaust throttle valve according to the first pressure deviation. The target pressure value is a calibration pressure value corresponding to the engine system in the current driving cycle. It can be understood that the target pressure value may be different in different driving conditions. Obviously, the smaller the difference between the first pressure data and the target pressure value, the closer the first pressure data is to the calibration pressure value corresponding to the engine system in the current driving cycle; the greater the difference between the first pressure data and the target pressure value, the greater the degree of deviation of the first pressure data from the calibration pressure value corresponding to the engine system in the current driving cycle. According to the degree of deviation of the first pressure data from the calibration pressure value corresponding to the engine system in the current driving cycle, the opening of the exhaust throttle valve is adjusted so that the difference between the first pressure data and the target pressure value is within an allowable error range. Specifically, the control device pre-stores the calibration pressure value of the engine system corresponding to each driving condition and the allowable error range. The control device obtains the calibration pressure value of the engine system corresponding to the current driving condition as the target pressure value according to the current driving condition.

[0070] In the present application, a first oxygen concentration sensor and a first pressure sensor are installed on the exhaust side of the engine; if it is determined that the closed-loop control mode of the exhaust throttle valve is the intake air amount control mode, the first oxygen concentration sensor collects the oxygen concentration of the exhaust passage to obtain a first oxygen concentration, a first intake air flow rate is calculated according to the first oxygen concentration, and closed-loop control is performed on the exhaust throttle valve according to the first intake air flow rate; if it is determined that the closed-loop control mode of the exhaust throttle valve is the pressure control mode, the first pressure sensor collects the pressure of the exhaust passage to obtain first pressure data, a first pressure deviation is determined according to the first pressure data, and closed-loop control is performed on the exhaust throttle valve according to the first pressure deviation. In the present application, there are multiple closed-loop control modes for the exhaust throttle valve, so if one of the closed-loop control modes fails or is not accurate, the other closed-loop control modes can be used to perform closed-loop control on the exhaust throttle valve, thereby ensuring the normal operation of the engine system and improving the reliability and control accuracy of the exhaust throttle valve control.

[0071] Optionally, the first intake air flow rate is determined according to the first oxygen concentration collected by the first oxygen concentration sensor, and the first intake air flow rate comprises:

[0072] M A = M F *(X O + K A ) / (K B -X O );

[0073] wherein M A is the first intake air flow rate, M F is the fuel consumption data of the engine, X Ois the first oxygen concentration, K A and K B Both are constants related to oxygen concentration and intake air volume.

[0074] In this embodiment, the control device pre-stores the formula M A =M F *(X O +K A ) / (K B -X O ), where K A It is a constant related to oxygen concentration and intake air volume. K can be selected here. A is 3.045, K B It is a constant related to oxygen concentration and intake air volume. K can be selected here. B is 0.21. Then M A =M F *(X O +3.045) / (0.21-X O ).

[0075] The control method shown in this embodiment may be optionally executed under steady-state operating conditions. The vehicle controller must first determine whether the engine is in a steady-state operating condition. Specifically, the vehicle controller determines whether the engine is in a steady-state condition based on parameters such as the engine speed, fuel supply, dew point detection and release performed by the upstream oxygen concentration sensor, exhaust throttle valve opening stability, and a first oxygen concentration. If the vehicle controller detects that the engine speed, fuel supply, dew point detection and release performed by the upstream oxygen concentration sensor, and exhaust throttle valve opening are all stable, and the first oxygen concentration is within a set calibration range, the engine is determined to be in a steady-state condition.

[0076] In this embodiment, if the vehicle controller or control device determines that the engine is in a steady-state operating condition, the control device collects the first oxygen concentration X through the first oxygen concentration sensor. O The control device is also electrically connected to the engine to obtain the engine's fuel consumption data M F , the X obtained at the same time O and M F Substitute into formula M A =M F *(X O +3.045) / (0.21-X O ), the first intake air flow M can be obtained A , the first intake air flow M A It can be understood as the actual intake flow or fresh intake air volume in the engine system. The first intake flow M is obtained AThen, a difference between the first intake flow and a target intake flow is calculated to obtain a first intake deviation, and the exhaust throttle valve is controlled in a closed loop according to the first intake deviation.

[0077] It can be understood that, in the initial stage of the control method, the first intake flow M A The control method can be used to determine the closed loop control mode of the exhaust throttle valve. If the first intake flow is greater than or equal to a first intake threshold, the intake amount control mode is entered; if the first intake flow is less than the first intake threshold, the pressure control mode is entered.

[0078] Optionally, in the intake amount control mode, the second intake flow is determined according to the intake side information collected by the intake side sensor, and the exhaust throttle valve is controlled in a closed loop according to the first intake flow and the second intake flow.

[0079] Optionally, the closed loop control of the exhaust throttle valve according to the first intake flow and the second intake flow includes: calculating a difference between the first intake flow and a target intake flow to obtain a first intake deviation, and calculating a difference between the second intake flow and the target intake flow to obtain a second intake deviation; and controlling the exhaust throttle valve in a closed loop according to the average of the first intake deviation and the second intake deviation.

[0080] In the embodiment, the second intake flow can be increased. The average of the second intake flow and the first intake flow is taken as the actual intake flow, so that the control accuracy of the intake amount control mode can be improved.

[0081] It can be understood that the first intake flow is calculated based on the first oxygen concentration, i.e., the exhaust side parameter. Here, the second intake flow is not related to the first oxygen concentration, but considers the parameters of the intake side of the engine. Specifically, the intake side information at least includes temperature data and pressure data of the intake passage, and the second intake flow is calculated according to the temperature data and the pressure data of the intake passage. Then, the first intake flow is calculated according to the exhaust side parameter, and the second intake flow is calculated according to the intake side parameter. The average of the two is taken as the actual intake flow, which can improve the calculation accuracy of the actual intake flow. The closed loop control of the exhaust throttle valve is performed according to the actual intake flow, which can improve the control accuracy of the intake amount control mode.

[0082] The control device has the formula (1) stored in advance:

[0083]

[0084] Wherein, φ f is the charging efficiency, A Q is the initial intake flow, A T is the second intake flow, P d is the intake pipe pressure, P e is the ambient pressure, T dPintake is the intake pipe temperature, D is the cylinder diameter, L is the stroke, i is the number of cylinders of the engine, and n is the rotation speed of the engine. C Pintake is the intake pipe temperature, D is the cylinder diameter, L is the stroke, i is the number of cylinders of the engine, and n is the rotation speed of the engine.

[0085] The control method shown in the embodiment can be optionally executed in a steady state. If the control device determines that the engine is in a steady state, the control device obtains the intake pipe pressure P d and the intake pipe temperature T d through an intake-side sensor, and further obtains the initial intake flow A Q and the ambient pressure P e through other intake-side sensors. The control device further calls relevant operating parameters of the engine system, such as the cylinder diameter D C , the stroke L, the number of cylinders i of the engine, and the rotation speed n of the engine. According to the intake pipe pressure P d and the intake pipe temperature T d , the charge efficiency φ f can be calculated. Substituting φ f , A Q , P d , P e , T d , D C , L, i, and n into formula (1), the second intake flow A T can be calculated.

[0086] The average of the first intake flow and the second intake flow is determined as the actual intake flow, i.e., the fresh air intake amount. The actual intake flow is subtracted from the target intake flow to obtain an intake deviation, and the exhaust throttle valve is controlled in a closed loop according to the intake deviation.

[0087] Alternatively, the difference between the first intake flow and the target intake flow is calculated to obtain a first intake deviation, and the difference between the second intake flow and the target intake flow is calculated to obtain a second intake deviation. The exhaust throttle valve is controlled in a closed loop according to the average of the first intake deviation and the second intake deviation.

[0088] In the embodiment, when the intake amount closed loop control mode is adopted, the second intake flow on the intake side can be calculated, the first intake flow on the exhaust side can be calculated, and the exhaust throttle valve is controlled in a closed loop according to the second intake flow and the first intake flow, which can improve the reliability and control accuracy of the exhaust throttle valve control.

[0089] It should be noted that the actual intake flow rate can be obtained by simply summing and averaging the first intake flow rate and the second intake flow rate. However, it is not limited thereto. In other embodiments, a calculation model of the actual intake flow rate can be preset in the control device, which considers various factors such as the weight, gain and process error of each parameter; the first intake flow rate and the second intake flow rate are substituted into the preset calculation model to calculate the actual intake flow rate. The calculation model of the actual intake flow rate in the control device is not specifically limited herein.

[0090] Based on the same inventive concept, the embodiment of the present application provides a control device of an engine system, which can execute the control method of any of the above-mentioned embodiments, and the control device is integrated in the engine system.

[0091] Figure 3 is a schematic diagram of a control device provided by the embodiment of the present application, as shown in Figure 3 The control device includes a mode selection module 310, a first control module 320 and a second control module 330; the mode selection module 310 is used to determine the closed-loop control mode of the exhaust throttle valve; the first control module 320 is used to determine the first intake flow rate according to the first oxygen concentration collected by the first oxygen concentration sensor when the closed-loop control mode of the exhaust throttle valve is the intake amount control mode, and to perform closed-loop control on the exhaust throttle valve according to the first intake flow rate; the second control module 330 is used to determine the first pressure deviation according to the first pressure data collected by the first pressure sensor when the closed-loop control mode of the exhaust throttle valve is the pressure control mode, and to perform closed-loop control on the exhaust throttle valve according to the first pressure deviation.

[0092] In the present application, the first oxygen concentration sensor and the first pressure sensor are installed on the exhaust side of the engine; if it is determined that the closed-loop control mode of the exhaust throttle valve is the intake amount control mode, the first oxygen concentration sensor collects the oxygen concentration of the exhaust passage to obtain the first oxygen concentration, the first intake flow rate is calculated according to the first oxygen concentration, and the closed-loop control on the exhaust throttle valve is performed according to the first intake flow rate; if it is determined that the closed-loop control mode of the exhaust throttle valve is the pressure control mode, the first pressure sensor collects the pressure of the exhaust passage to obtain the first pressure data, the first pressure deviation is determined according to the first pressure data, and the closed-loop control on the exhaust throttle valve is performed according to the first pressure deviation. In the present application, there are multiple closed-loop control modes of the exhaust throttle valve, so if one of the closed-loop control modes fails or is not accurate, the closed-loop control on the exhaust throttle valve can be performed by using other closed-loop control modes, so that the normal operation of the engine system can be ensured, and the reliability and control accuracy of the exhaust throttle valve control can be improved.

[0093] The control device provided by the embodiment of the present application can execute the control method provided by any of the embodiments of the present application, and has the corresponding functional modules and beneficial effects of the execution method.

[0094] Figure 4 FIG is a schematic diagram of an electronic device provided by an embodiment of the present invention. Figure 4 As shown, electronic device 410 is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic device 410 may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0095] The electronic device 410 includes at least one processor 411 and a memory connected to the at least one processor 411 in communication, such as a read-only memory (ROM) 412, a random access memory (RAM) 413, etc., wherein the memory stores a computer program that can be executed by the at least one processor 411. The computer program is executed by the at least one processor 411 so that the at least one processor 411 can perform the method described in any embodiment of the present invention. The processor 411 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 412 or the computer program loaded from the storage unit 418 to the random access memory (RAM) 413. Various programs and data required for the operation of the electronic device 410 can also be stored in the RAM 413. The processor 411, ROM 412, and RAM 413 are connected to each other via a bus 414. An input / output (I / O) interface 415 is also connected to the bus 414.

[0096] Multiple components in electronic device 410 are connected to I / O interface 415, including an input unit 416, such as a keyboard, mouse, etc.; an output unit 417, such as various types of displays, speakers, etc.; a storage unit 418, such as a magnetic disk, optical disk, etc.; and a communication unit 419, such as a network card, modem, wireless communication transceiver, etc. The communication unit 419 allows electronic device 410 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0097] The processor 411 can be various general-purpose and / or special-purpose processing components having processing and computing capabilities. Some examples of the processor 411 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, and the like. The processor 411 performs various methods and processes described above, such as the methods described in any embodiment of the present application.

[0098] The embodiments of the present application provide a computer-readable storage medium storing a computer program, which is used to cause the processor 411 to implement the method described in any embodiment of the present application when executed. In some embodiments, the method can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as the storage unit 418. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 410 via the ROM 412 and / or the communication unit 419. When the computer program is loaded into the RAM 413 and executed by the processor 411, one or more steps of the method described above can be performed. Alternatively, in other embodiments, the processor 411 can be configured to perform the method described in any embodiment of the present application by any other appropriate means (for example, by means of firmware).

[0099] Various embodiments of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (PLD), a computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0100] Computer programs for implementing the methods of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer program, when executed, enables the functions / acts specified in the flowcharts and / or block diagrams to be implemented. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as a standalone software package and partially on a remote machine or entirely on a remote machine or server.

[0101] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of a machine-readable storage medium will include one or more lines of a program of instructions in a transitory signal, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0102] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0103] The systems and techniques described herein can be implemented in a computing system that includes a back end component, e.g., as a data server, or that includes a middleware component, e.g., an application server, or that includes a front end component, e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described herein, or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0104] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0105] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present disclosure. For example, the steps recited in the present disclosure can be executed in parallel, executed in series, or executed in different orders, as long as the desired results of the technical solutions of the present disclosure can be achieved, and the present disclosure is not limited herein.

[0106] The above detailed description does not constitute a limitation on the protection scope of the present application. 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 replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A control method of an engine system characterized by, The engine system comprises an engine, a first oxygen concentration sensor installed on an exhaust side of the engine, an exhaust throttle valve, and a first pressure sensor; The control method comprises: determining a closed-loop control mode of the exhaust throttle valve; if the closed-loop control mode of the exhaust throttle valve is an intake amount control mode, determining a first intake flow rate according to a first oxygen concentration collected by the first oxygen concentration sensor, determining a second intake flow rate according to intake side information collected by an intake side sensor, and performing closed-loop control on the exhaust throttle valve according to the first intake flow rate and the second intake flow rate; if the closed-loop control mode of the exhaust throttle valve is a pressure control mode, determining a first pressure deviation according to first pressure data collected by the first pressure sensor, and performing closed-loop control on the exhaust throttle valve according to the first pressure deviation.

2. The control method according to claim 1, characterized by, Determining the closed-loop control mode of the exhaust throttle valve comprises: when the engine is in a steady state working condition, determining the first intake flow rate according to the first oxygen concentration collected by the first oxygen concentration sensor; if the first intake flow rate is greater than or equal to a first intake threshold value, entering the intake amount control mode; or if the first intake flow rate is less than the first intake threshold value, entering the pressure control mode.

3. The control method according to claim 1, characterized by, Determining the first intake flow rate according to the first oxygen concentration collected by the first oxygen concentration sensor comprises: ； wherein M A is the first intake air flow rate, M F is the oil consumption data of the engine, X O is the first oxygen concentration, K A and K B are constants related to oxygen concentration and intake air amount.

4. The control method according to claim 1, characterized by, Determining the first pressure deviation according to the first pressure data collected by the first pressure sensor comprises: calculating a difference between the first pressure data and a target pressure value to obtain the first pressure deviation, and performing closed-loop control on the exhaust throttle valve according to the first pressure deviation.

5. The control method according to claim 1, characterized by, Performing closed-loop control on the exhaust throttle valve according to the first intake flow rate and the second intake flow rate comprises: calculating a difference between the first intake flow rate and a target intake flow rate to obtain a first intake deviation, and calculating a difference between the second intake flow rate and the target intake flow rate to obtain a second intake deviation; performing closed-loop control on the exhaust throttle valve according to an average value of the first intake deviation and the second intake deviation.

6. A control device of an engine system characterized by comprising: The engine system comprises an engine, a first oxygen concentration sensor installed on an exhaust side of the engine, an exhaust throttle valve, and a first pressure sensor; The control device is integrated in the engine system and is configured to perform the control method according to any one of claims 1-5.

7. An engine system characterized by, Comprises: The control device according to claim 6; The control device is electrically connected to the first oxygen concentration sensor, the exhaust throttle valve, and the first pressure sensor, respectively.

8. The engine system of claim 7, wherein Further comprises: a turbine; The exhaust throttle valve is located between the turbine and the first oxygen concentration sensor, and the exhaust throttle valve is arranged on an output side of the turbine.

Images