Engine system and control method and control device thereof

Abstract

The invention discloses an engine system and a control method and device thereof. The control method comprises the steps that a closed-loop control mode of an exhaust throttle valve is determined; if the closed-loop control mode of the exhaust throttle valve is an air inflow control mode, first air inflow is determined according to first oxygen concentration collected by a first oxygen concentration sensor, and closed-loop control is conducted on the exhaust throttle valve according to the first air inflow; and if the closed-loop control mode of the exhaust throttle valve is the pressure control mode, first pressure deviation is determined according to first pressure data collected by the first pressure sensor, and closed-loop control is conducted on the exhaust throttle valve according to the first pressure deviation. According to the exhaust throttle valve control method, the exhaust throttle valve has multiple closed-loop control modes, if one closed-loop control mode breaks down or control is inaccurate, other closed-loop control modes can be adopted for closed-loop control of the exhaust throttle valve, in this way, normal operation of an engine system can be guaranteed, and the control reliability and control precision of the exhaust throttle valve are improved.

Description

Technical Field

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

[0002] The engine (such as a diesel engine) includes an exhaust throttle valve ETV, which is installed in the exhaust passage of the engine. The function of the exhaust throttle valve is to adjust the exhaust gas flow rate by changing the opening of the exhaust throttle valve so that the treated exhaust gas meets the requirements of national regulations.

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

[0004] The invention provides an engine system and a control method and a control device thereof, so as to improve the control reliability of an exhaust throttle valve.

[0005] According to one aspect of the present invention, there is provided a control method for an engine system, the engine system comprising an engine, a first oxygen concentration sensor mounted on an 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 air quantity control mode, a first intake air flow rate is determined according to a first oxygen concentration collected by the first oxygen concentration sensor, and the exhaust throttle valve is closed-loop controlled according to the first intake air flow rate;

[0009] If the closed-loop control mode of the exhaust throttle valve is a pressure control mode, a first pressure deviation is determined according to first pressure data collected by the first pressure sensor, and the exhaust throttle valve is closed-loop controlled according to the first pressure deviation.

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

[0011] When the engine is in a steady-state condition, determining the first intake air flow rate according to the first oxygen concentration collected by the first oxygen concentration sensor;

[0012] If the first intake air flow rate is greater than or equal to the first intake air threshold, the intake air quantity control mode is entered; or, if the first intake air flow rate is less than the first intake air threshold, the pressure control mode is entered.

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

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

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

[0016] Further, performing closed-loop control on the exhaust throttle valve according to the first intake air flow rate includes:

[0017] A difference between the first intake air flow rate and a target intake air flow rate is calculated to obtain a first intake air deviation, and closed-loop control is performed on 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 includes:

[0019] The difference between the first pressure data and the target pressure value is calculated to obtain a first pressure deviation, and the exhaust throttle valve is closed-loop controlled according to the first pressure deviation.

[0020] Furthermore, the intake air volume control mode further includes:

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

[0022] The exhaust throttle valve is closed-loop controlled according to the first intake air flow rate and the second intake air flow rate.

[0023] Further, performing closed-loop control on the exhaust throttle valve according to the first intake air flow rate and the second intake air flow rate includes:

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

[0025] The exhaust throttle valve is closed-loop controlled according to an average of the first intake deviation and the second intake deviation.

[0026] According to another aspect of the present invention, there is provided a control device for an engine system, the engine system comprising an engine, a first oxygen concentration sensor mounted 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, used for determining a closed-loop control mode of the exhaust throttle valve;

[0029] a first control module, configured to determine a first intake flow rate according to a first oxygen concentration collected by the first oxygen concentration sensor when the closed-loop control mode of the exhaust throttle valve is an intake air quantity control mode, and perform closed-loop control on the exhaust throttle valve according to the first intake air flow rate;

[0030] The second control module is used to determine a first pressure deviation according to first pressure data collected by the first pressure sensor when the closed-loop control mode of the exhaust throttle valve is a pressure control mode, and perform closed-loop control on the exhaust throttle valve according to the first pressure deviation.

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

[0032] Also included is: an engine, a first oxygen concentration sensor mounted on the 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, it also includes: a turbine;

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

[0036] In the present invention, a first oxygen concentration sensor and a first pressure sensor are installed on the exhaust side of the engine; if the closed-loop control mode of the exhaust throttle valve is determined to be the intake air volume control mode, the first oxygen concentration sensor collects the oxygen concentration of the exhaust passage to obtain the first oxygen concentration, calculates the first intake air flow rate according to the first oxygen concentration, and performs closed-loop control on the exhaust throttle valve according to the first intake air flow rate; if the closed-loop control mode of the exhaust throttle valve is determined to be the pressure control mode, the first pressure sensor collects the pressure of the exhaust passage to obtain the first pressure data, determines the first pressure deviation according to the first pressure data, and performs closed-loop control on the exhaust throttle valve according to the first pressure deviation. In the present invention, there are multiple closed-loop control modes for the exhaust throttle valve. If one of the closed-loop control modes fails or the control is inaccurate, other closed-loop control modes can be used to perform closed-loop control of 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.

[0037] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

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

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

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] Figure 1 is a schematic diagram of an engine system provided by an embodiment of the present invention, such as Figure 1 As shown, the engine system includes: a control device 101; and also includes: an engine 102, a first oxygen concentration sensor 103 installed on the 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. The optional engine system also 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 set on the output side of the turbine 106.

[0046] In this embodiment, the engine system includes a control device 101, which communicates with various components in the engine system. The control device 101 receives and processes signals from multiple components in the engine system, and then applies control signals to multiple components in the engine system to enable the engine system to operate normally.

[0047] The engine system includes an engine 102, and the engine 102 includes an intake side and an exhaust side. The intake side of the engine 102 can be understood as the pre-processing of the engine, and the exhaust side of the engine 102 can be understood as the post-processing of the engine. The intake side of the engine 102 includes an intake passage, and the gas enters the engine 102 through the intake passage. The exhaust side of the engine 102 includes an exhaust passage, and the gas processed by the engine 102 is output through the exhaust passage.

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

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

[0050] The first oxygen concentration sensor 103 and the exhaust throttle valve 104 are optionally installed on 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 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 is understood that the installation position of the first oxygen concentration sensor and the exhaust throttle valve is not limited to Figure 1 As shown, if the product allows, the installation positions of the first oxygen concentration sensor and the exhaust throttle valve can be reasonably designed; for example, the first oxygen concentration sensor is installed on the input side of the turbine, or the exhaust throttle valve is installed on the input side of the turbine, and so on.

[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 the control device 101 can obtain the pressure data collected by the first pressure sensor 105. After analyzing and processing the signals of various components in the engine system, the control device 101 can control the opening of the exhaust throttle valve 104 so that the operating condition of the engine system meets the requirements. The control device 101 includes devices such as a microcontroller and a single-chip microcomputer that can perform data calculation processing. The control device 101 can be integrated in the vehicle controller ECU of the vehicle.

[0052] The optional intake side of the 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 optional installation position of the temperature and pressure sensor 107 is close to the intake port of the engine 102. The temperature and pressure sensor 107 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 multiple intake side sensors, and the multiple intake side sensors include temperature sensors and pressure sensors. The installation position of the temperature and pressure sensor 107 is not limited to Figure 1 As shown, if the product allows, the installation position of the temperature and pressure sensor can be reasonably designed, then the temperature data and pressure data detected by the temperature and pressure sensor represent the temperature and pressure in the intake passage at the installation position.

[0053] Figure 2 is a schematic diagram of a control method for an engine system provided by an embodiment of the present invention. This embodiment is applicable to the case of exhaust throttle valve closed-loop control of a vehicle. The control method can be executed by a control device. The control device can be implemented in the form of hardware and / or software. The control device can be configured in an engine system. The engine system can be an engine system of any vehicle. The optional control device and engine system in this embodiment refer to Figure 1 As shown, but not limited to.

[0054] like Figure 2 As shown, the control method includes:

[0055] Step 210, determining a 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 air volume control mode, a first intake air flow rate is determined according to a first oxygen concentration collected by a first oxygen concentration sensor, and the exhaust throttle valve is closed-loop controlled according to the first intake air flow rate;

[0057] Step 230: If the closed-loop control mode of the exhaust throttle valve is the pressure control mode, determine a first pressure deviation according to first pressure data collected by the first pressure sensor, and perform closed-loop control on the exhaust throttle valve according to the first pressure deviation.

[0058] In this embodiment, there are multiple closed-loop control modes for the exhaust throttle valve. If one of the closed-loop control modes fails, such as failure of components such as sensors or inaccurate data collection, other closed-loop control modes can be used, which can ensure the normal operation of the engine system and improve the reliability and accuracy of the exhaust throttle valve control.

[0059] Specifically, the closed-loop control mode of the exhaust throttle valve includes at least an intake volume control mode and a pressure control mode. The intake volume control mode is to perform closed-loop control on the exhaust throttle valve based on the intake flow rate, and the pressure control mode is to perform closed-loop control on the exhaust throttle valve based on the pressure in the exhaust passage. It can be understood that, while 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, not limited to the intake volume control mode that performs closed-loop control of the exhaust throttle valve based on the intake flow rate, nor limited to the pressure control mode that performs closed-loop control of the exhaust throttle valve based on the pressure in the exhaust passage. The closed-loop control described herein is a control method that uses PID parameter adjustment, that is, the output feedback value is compared with the input set value, and the PID parameter adjustment is used to make it infinitely close.

[0060] Here, the closed-loop control mode of the exhaust throttle valve is determined by presetting the priorities of multiple different control modes in the control device, and determining the currently required closed-loop control mode according to the priority. When a closed-loop control mode with a high priority fails, or has a large error, or the sensor drift fails, the next level of closed-loop control mode is sequentially determined as the currently required closed-loop control mode. Exemplarily, the priority of the pressure control mode pre-designed in the control device is higher than the intake volume control mode. Then, under normal circumstances, the pressure control mode is used by default for closed-loop control of the exhaust throttle valve; but when the pressure control mode fails, such as the sensor collecting the signal is damaged, the intake volume control mode is sequentially used for closed-loop control of the exhaust throttle valve.

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

[0062] The optional closed-loop control mode of the exhaust throttle valve includes: when the engine is in a steady-state condition, determining a first intake flow rate based on a first oxygen concentration collected by a first oxygen concentration sensor; if the first intake flow rate is greater than or equal to a first intake threshold, entering an intake volume control mode; or, if the first intake flow rate is less than the first intake threshold, entering a pressure control mode.

[0063] In this 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, it means that the intake flow rate is small. If the intake volume control mode is adopted, 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, it means that the intake flow rate is large. If the intake volume control mode is adopted, the large intake flow rate is convenient for subsequent adjustment and can improve control accuracy. Therefore, if the first intake flow rate is less than the first intake threshold, the pressure control mode is entered.

[0064] It should be noted that the control method shown in this embodiment can be used to perform closed-loop control of the exhaust throttle valve under steady-state conditions of the engine, which can improve the closed-loop control accuracy of the exhaust throttle valve. However, it is not limited to this. If the product requires, Figure 2 The control method shown can also be performed in non-steady-state conditions.

[0065] It can be understood that if the first intake flow rate is greater than or equal to the first intake threshold and the intake volume control mode is entered, then in the intake volume control mode, the exhaust throttle valve can be directly closed-loop controlled based on the obtained first intake flow rate without having to repeatedly calculate the first intake flow rate.

[0066] If the closed-loop control mode of the exhaust throttle valve is the intake air volume control mode, it is necessary to determine the first intake air flow rate, and the first intake air flow rate mentioned here is the actual intake air 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 can be the oxygen concentration of the exhaust passage after the exhaust throttle valve; then the first intake air flow rate is calculated based on the first oxygen concentration; then, the exhaust throttle valve is closed-loop controlled based on the first intake air flow rate, and specifically the opening of the exhaust throttle valve is increased or decreased according to the relevant changes of the first intake air flow rate.

[0067] The exhaust throttle valve may be selectively controlled in a closed loop according to the first intake flow rate, including: calculating the difference between the first intake flow rate and the target intake flow rate to obtain a first intake deviation, and performing closed loop control on the exhaust throttle valve according to the first intake deviation. Here, the target intake flow rate is the calibrated intake flow rate corresponding to the engine system in the current driving cycle. It can be understood that the target intake flow rate may be different under 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 calibrated intake flow rate corresponding to the engine system in the current driving cycle; the larger the difference between the first intake flow rate and the target intake flow rate, the greater the degree to which the first intake flow rate deviates from the calibrated intake flow rate corresponding to the engine system in the current driving cycle. According to the degree to which the first intake flow rate deviates from the calibrated 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 calibrated intake flow rate and the allowable error range of the engine system corresponding to each driving condition. The control device obtains the calibrated intake flow rate of the corresponding engine system according to the current driving situation as the target intake flow rate.

[0068] If the closed-loop control mode of the exhaust throttle valve is a pressure control mode, it is necessary to determine the first pressure data, which 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 by comparing the first pressure data with the target pressure data; then, the exhaust throttle valve is closed-loop controlled based on the first pressure deviation, specifically increasing or decreasing the opening of the exhaust throttle valve according to the change in the size of the first pressure deviation.

[0069] Optionally, determining the first pressure deviation according to the first pressure data collected by the first pressure sensor includes: calculating the difference between the first pressure data and the 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. Here, the target pressure value is the calibrated pressure value corresponding to the engine system in the current driving cycle. It can be understood that the target pressure value may be different under 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 calibrated pressure value corresponding to the engine system in the current driving cycle; the larger the difference between the first pressure data and the target pressure value, the greater the degree to which the first pressure data deviates from the calibrated pressure value corresponding to the engine system in the current driving cycle. According to the degree to which the first pressure data deviates from the calibrated 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 the allowable error range. Specifically, the control device pre-stores the calibrated pressure value and the allowable error range of the engine system corresponding to each driving condition. The control device obtains the calibrated pressure value of the corresponding engine system as the target pressure value according to the current driving condition.

[0070] In the present invention, a first oxygen concentration sensor and a first pressure sensor are installed on the exhaust side of the engine; if the closed-loop control mode of the exhaust throttle valve is determined to be the intake air volume control mode, the first oxygen concentration sensor collects the oxygen concentration of the exhaust passage to obtain the first oxygen concentration, calculates the first intake air flow rate according to the first oxygen concentration, and performs closed-loop control on the exhaust throttle valve according to the first intake air flow rate; if the closed-loop control mode of the exhaust throttle valve is determined to be the pressure control mode, the first pressure sensor collects the pressure of the exhaust passage to obtain the first pressure data, determines the first pressure deviation according to the first pressure data, and performs closed-loop control on the exhaust throttle valve according to the first pressure deviation. In the present invention, there are multiple closed-loop control modes for the exhaust throttle valve. If one of the closed-loop control modes fails or the control is inaccurate, other closed-loop control modes can be used to perform closed-loop control of 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, determining the first intake air flow rate according to the first oxygen concentration collected by the first oxygen concentration sensor includes:

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

[0073] Among them, 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 They are all 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 is a constant related to oxygen concentration and intake air volume. K can be selected here. A is 3.045, K B 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 can be optionally executed under steady-state conditions. Then the vehicle controller of the vehicle needs to first determine whether the engine is in a steady-state 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 completed by the upstream oxygen concentration sensor, valve opening stability of the exhaust throttle valve, and the first oxygen concentration. Among them, if the vehicle controller detects that the engine speed, fuel supply, dew point detection and release completed by the upstream oxygen concentration sensor, valve opening stability of the exhaust throttle valve, etc. are all in a stable state, and the first oxygen concentration is within the set calibration range, it is determined that the engine is in a steady-state condition.

[0076] In this embodiment, if the vehicle controller or the control device determines that the engine is in a steady-state 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 amount in the engine system. The first intake flow M is obtained AThen, a difference between the first intake flow rate and the target intake flow rate is calculated to obtain a first intake deviation, and the exhaust throttle valve is closed-loop controlled according to the first intake deviation.

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

[0078] The optional intake volume control mode also includes: determining a second intake flow rate based on intake side information collected by an intake side sensor; and performing closed-loop control of the exhaust throttle valve based on the first intake flow rate and the second intake flow rate.

[0079] Optional closed-loop control of the exhaust throttle valve based on the first intake flow rate and the second intake flow rate includes: calculating the difference between the first intake flow rate and the target intake flow rate to obtain a first intake deviation, and calculating the difference between the second intake flow rate and the target intake flow rate to obtain a second intake deviation; and closed-loop control of the exhaust throttle valve based on the average of the first intake deviation and the second intake deviation.

[0080] In this embodiment, the second intake air flow rate may be increased, and the average of the second intake air flow rate and the first intake air flow rate may be used as the actual intake air flow rate, thereby improving the control accuracy of the intake air flow control mode.

[0081] It can be understood that the first intake flow rate is calculated based on the first oxygen concentration, i.e., the exhaust side parameter. Here, the second intake flow rate has nothing to do with the first oxygen concentration, but takes into account the parameters of the intake side of the engine. Specifically, the intake side information at least includes the temperature data and pressure data of the intake passage, and the second intake flow rate is calculated based on the temperature data and pressure data of the intake passage. Then the first intake flow rate is calculated based on the exhaust side parameters, and the second intake flow rate is calculated based on the intake side parameters. The average of the two is used as the actual intake flow rate, which can improve the calculation accuracy of the actual intake flow rate. The closed-loop control of the exhaust throttle valve is performed based on this actual intake flow rate, which can improve the control accuracy of the intake volume control mode.

[0082] The control device pre-stores formula (1):

[0083]

[0084] Among them, φ f is the charging efficiency, A Q is the initial intake air flow rate, A T is the second intake air flow rate, P d is the intake manifold pressure, P e is the environmental pressure, T dis the intake pipe temperature, D C is the cylinder diameter, L is the stroke, i is the number of cylinders of the engine, and n is the engine speed.

[0085] The control method shown in this embodiment can be optionally executed under steady-state conditions. If the control device determines that the engine is in a steady-state condition, the control device obtains the intake pipe pressure P through the intake side sensor. d and intake pipe temperature T d The control device also obtains the initial intake air flow rate A through other intake side sensors Q and environmental pressure P e The control device also retrieves relevant operating parameters of the engine system such as cylinder diameter D C , stroke L, number of cylinders i of the engine and engine speed n. According to the intake manifold pressure P d and intake pipe temperature T d , the inflation efficiency φ can be calculated f . f , A Q , P d , P e , T d , D C , L, i and n are substituted into formula (1) to calculate the second intake flow rate A T .

[0086] The average of the first intake flow rate and the second intake flow rate is determined as the actual intake flow rate, i.e., the fresh intake flow rate, and then the actual intake flow rate is subtracted from the target intake flow rate to obtain the intake deviation, and the exhaust throttle valve is closed-loop controlled based on the intake deviation.

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

[0088] In this embodiment, when the intake volume closed-loop control mode is adopted, the second intake flow rate on the intake side can be calculated, and the first intake flow rate on the exhaust side can be calculated. The exhaust throttle valve is closed-loop controlled based on the second intake flow rate and the first intake flow rate, which can improve the reliability and control accuracy of the exhaust throttle valve control.

[0089] It should be noted that the actual intake air flow rate can be obtained by simply summing the first intake air flow rate and the second intake air flow rate and then calculating the average value. However, it is not limited to this. In other embodiments, the control device may be preset with a calculation model for the actual intake air flow rate, and the calculation model takes into account various factors such as the weights, gains, and process errors of various parameters; the first intake air flow rate and the second intake air flow rate are substituted into the preset calculation model to calculate the actual intake air flow rate. The calculation model for the actual intake air flow rate in the control device is not specifically limited here.

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

[0091] Figure 3 is a schematic diagram of a control device provided by an embodiment of the present invention, such as Figure 3 As shown, 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 volume control mode, and 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 perform closed-loop control on the exhaust throttle valve according to the first pressure deviation.

[0092] In the present invention, a first oxygen concentration sensor and a first pressure sensor are installed on the exhaust side of the engine; if the closed-loop control mode of the exhaust throttle valve is determined to be the intake air volume control mode, the first oxygen concentration sensor collects the oxygen concentration of the exhaust passage to obtain the first oxygen concentration, calculates the first intake air flow rate according to the first oxygen concentration, and performs closed-loop control on the exhaust throttle valve according to the first intake air flow rate; if the closed-loop control mode of the exhaust throttle valve is determined to be the pressure control mode, the first pressure sensor collects the pressure of the exhaust passage to obtain the first pressure data, determines the first pressure deviation according to the first pressure data, and performs closed-loop control on the exhaust throttle valve according to the first pressure deviation. In the present invention, there are multiple closed-loop control modes for the exhaust throttle valve. If one of the closed-loop control modes fails or the control is inaccurate, other closed-loop control modes can be used to perform closed-loop control of 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.

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

[0094] Figure 4 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 processing, 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 required 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, and 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, and 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. In the RAM 413, various programs and data required for the operation of the electronic device 410 can also be stored. The processor 411, the ROM 412, and the 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 the electronic device 410 are connected to the I / O interface 415, including: an input unit 416, such as a keyboard, a mouse, etc.; an output unit 417, such as various types of displays, speakers, etc.; a storage unit 418, such as a disk, an optical disk, etc.; and a communication unit 419, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 419 allows the electronic device 410 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0097] The processor 411 may be a variety of general and / or special processing components with 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 special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 411 performs the various methods and processes described above, such as the method described in any embodiment of the present invention.

[0098] An embodiment of the present invention provides a computer-readable storage medium, which stores a computer program, and the computer program is used to implement the method described in any embodiment of the present invention when the processor 411 executes. In some embodiments, the method can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a 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 ROM412 and / or communication unit 419. When the computer program is loaded into RAM413 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 invention in any other appropriate manner (for example, by means of firmware).

[0099] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0100] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0101] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, 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 disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0102] To provide interaction with a user, the systems and techniques described herein may 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 trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0103] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may 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] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may 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 difficult management and weak business scalability in traditional physical hosts and VPS services.

[0105] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0106] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for an engine system, characterized in that: The engine system includes an engine, a first oxygen concentration sensor mounted 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 air quantity control mode, a first intake air flow rate is determined according to a first oxygen concentration collected by the first oxygen concentration sensor, and the exhaust throttle valve is closed-loop controlled according to the first intake air flow rate; If the closed-loop control mode of the exhaust throttle valve is a pressure control mode, a first pressure deviation is determined according to first pressure data collected by the first pressure sensor, and the exhaust throttle valve is closed-loop controlled according to the first pressure deviation.

2. The control method according to claim 1, characterized in that: Determining the closed-loop control mode of the exhaust throttle valve includes: When the engine is in a steady-state condition, determining the first intake air flow rate according to the first oxygen concentration collected by the first oxygen concentration sensor; If the first intake air flow rate is greater than or equal to the first intake air threshold, the intake air quantity control mode is entered; or, if the first intake air flow rate is less than the first intake air threshold, the pressure control mode is entered.

3. The control method according to claim 1, characterized in that: Determining a first intake air flow rate according to a first oxygen concentration collected by the first oxygen concentration sensor includes: M A =M F *(X O +K A ) / (K B -X O ); Among them, M A is the first intake air flow rate, M F is the fuel consumption data of the engine, X O is the first oxygen concentration, K A and K B They are all constants related to oxygen concentration and intake air volume.

4. The control method according to claim 1, characterized in that: Performing closed-loop control on the exhaust throttle valve according to the first intake air flow rate includes: A difference between the first intake air flow rate and a target intake air flow rate is calculated to obtain a first intake air deviation, and closed-loop control is performed on the exhaust throttle valve according to the first intake air deviation.

5. The control method according to claim 1, characterized in that: Determining a first pressure deviation according to first pressure data collected by the first pressure sensor includes: The difference between the first pressure data and the target pressure value is calculated to obtain a first pressure deviation, and the exhaust throttle valve is closed-loop controlled according to the first pressure deviation.

6. The control method according to claim 1, characterized in that: The intake air volume control mode further includes: determining a second intake air flow rate according to intake side information collected by an intake side sensor; The exhaust throttle valve is closed-loop controlled according to the first intake air flow rate and the second intake air flow rate.

7. The control method according to claim 6, characterized in that: Performing closed-loop control on the exhaust throttle valve according to the first intake air flow rate and the second intake air flow rate includes: Calculating a difference between the first intake air flow rate and a target intake air flow rate to obtain a first intake air deviation, and calculating a difference between the second intake air flow rate and the target intake air flow rate to obtain a second intake air deviation; The exhaust throttle valve is closed-loop controlled according to an average of the first intake deviation and the second intake deviation.

8. A control device for an engine system, characterized in that: The engine system includes an engine, a first oxygen concentration sensor mounted on an exhaust side of the engine, an exhaust throttle valve, and a first pressure sensor; The control device comprises: A mode selection module, used for determining a closed-loop control mode of the exhaust throttle valve; a first control module, configured to determine a first intake flow rate according to a first oxygen concentration collected by the first oxygen concentration sensor when the closed-loop control mode of the exhaust throttle valve is an intake air quantity control mode, and perform closed-loop control on the exhaust throttle valve according to the first intake air flow rate; The second control module is used to determine a first pressure deviation according to first pressure data collected by the first pressure sensor when the closed-loop control mode of the exhaust throttle valve is a pressure control mode, and perform closed-loop control on the exhaust throttle valve according to the first pressure deviation.

9. An engine system, characterized in that: include: The control device as claimed in claim 8; Also included is: an engine, a first oxygen concentration sensor mounted on the exhaust side of the engine, an exhaust throttle valve, and a first pressure sensor; The control device is electrically connected to the first oxygen concentration sensor, the exhaust throttle valve, and the first pressure sensor, respectively.

10. The engine system according to claim 9, characterized in that Also includes: turbine; The exhaust throttle valve is located between the turbine and the first oxygen concentration sensor, and the exhaust throttle valve is provided on an output side of the turbine.

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