Diesel engine combustion parameter adjustment method, device, equipment and readable storage medium

Abstract

The application provides a diesel engine combustion parameter adjustment method, device, equipment and readable storage medium. The method comprises the following steps: obtaining combustion parameters corresponding to each preset nitrogen oxide emission amount; calculating an engine nitrogen oxide target emission amount based on an engine system nitrogen oxide standard emission amount and a nitrogen oxide conversion efficiency; comparing the engine nitrogen oxide target emission amount with each preset nitrogen oxide emission amount to obtain a comparison result; and determining a diesel engine combustion parameter based on the comparison result and the combustion parameters corresponding to each preset nitrogen oxide emission amount. Through the application, the problem that liquid economy cannot be reduced under the premise of meeting the nitrogen oxide emission requirement is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, and particularly relates to a diesel engine combustion parameter adjustment method, device, equipment and readable storage medium. BACKGROUND

[0002] Liquid economy is the comprehensive economy considering fuel consumption and urea consumption. At present, due to the characteristics of the diesel engine, the nitrogen oxide emission level is inversely related to the fuel consumption. How to reduce the liquid economy under the premise of meeting the nitrogen oxide emission requirement is a technical problem to be solved urgently. SUMMARY

[0003] The main purpose of the present application is to provide a diesel engine combustion parameter adjustment method, device, equipment and readable storage medium, which aims to reduce the liquid economy under the premise of meeting the nitrogen oxide emission requirement.

[0004] In a first aspect, the present application provides a diesel engine combustion parameter adjustment method, which comprises:

[0005] obtaining a combustion parameter corresponding to each preset nitrogen oxide emission amount;

[0006] calculating an engine nitrogen oxide target emission amount based on an engine system nitrogen oxide standard emission amount and a nitrogen oxide conversion efficiency;

[0007] comparing the engine nitrogen oxide target emission amount with each preset nitrogen oxide emission amount to obtain a comparison result;

[0008] determining a diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission amount.

[0009] Optionally, the each preset nitrogen oxide emission amount comprises: a minimum engine nitrogen oxide emission amount, an engine nitrogen oxide emission amount at the end of engine system use and an engine nitrogen oxide emission amount at the best liquid economy, wherein the minimum engine nitrogen oxide emission amount is less than the engine nitrogen oxide emission amount at the end of engine system use, and the engine nitrogen oxide emission amount at the end of engine system use is less than the engine nitrogen oxide emission amount at the best liquid economy.

[0010] Optionally, the step of comparing the engine nitrogen oxide target emission amount with each preset nitrogen oxide emission amount to obtain a comparison result comprises:

[0011] comparing the engine nitrogen oxide target emission amount with the minimum engine nitrogen oxide emission amount, the engine nitrogen oxide emission amount at the end of engine system use and the engine nitrogen oxide emission amount at the best liquid economy;

[0012] the comparison result is that the engine NOx target emission is less than or equal to the minimum engine NOx emission, or the engine NOx target emission is greater than the minimum engine NOx emission and less than or equal to the engine NOx emission at the end of the engine system service life, or the engine NOx target emission is greater than the engine NOx emission at the end of the engine system service life and less than or equal to the engine NOx emission at the best liquid economy, or the engine NOx target emission is greater than the engine NOx emission at the best liquid economy.

[0013] Optionally, when the comparison result is that the engine NOx target emission is less than or equal to the minimum engine NOx emission, the step of determining the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset engine NOx emission comprises:

[0014] determining the diesel engine combustion parameter as the combustion parameter corresponding to the minimum engine NOx emission.

[0015] Optionally, when the comparison result is that the engine NOx target emission is greater than the minimum engine NOx emission and less than or equal to the engine NOx emission at the end of the engine system service life, the step of determining the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset engine NOx emission comprises:

[0016] calculating a first difference value of the engine NOx target emission minus the minimum engine NOx emission and a second difference value of the engine NOx emission at the end of the engine system service life minus the minimum engine NOx emission;

[0017] calculating a quotient of the first difference value divided by the second difference value, and taking the quotient as a first trade-off coefficient;

[0018] calculating a third difference value of the combustion parameter corresponding to the engine NOx emission at the end of the engine system service life minus the combustion parameter corresponding to the minimum engine NOx emission;

[0019] calculating a first sum value of the third difference value multiplied by the first trade-off coefficient plus the combustion parameter corresponding to the minimum engine NOx emission, and taking the first sum value as the diesel engine combustion parameter.

[0020] Optionally, when the comparison result is that the engine NOx target emission is greater than the engine NOx emission at the end of the engine system service life and less than or equal to the engine NOx emission at the best liquid economy, the step of determining the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset engine NOx emission comprises:

[0021] a fourth difference value between the engine nitrogen oxide target emission amount and the engine nitrogen oxide emission amount at the end of the service life of the engine system, and a fifth difference value between the engine nitrogen oxide emission amount at the time of the best liquid economy and the engine nitrogen oxide emission amount at the end of the service life of the engine system;

[0022] a quotient of the fourth difference value divided by the fifth difference value, the quotient being used as a second trade-off coefficient;

[0023] a sixth difference value between the combustion parameter corresponding to the engine nitrogen oxide emission amount at the time of the best liquid economy and the combustion parameter corresponding to the engine nitrogen oxide emission amount at the end of the service life of the engine system;

[0024] a second sum value of the sixth difference value multiplied by the second trade-off coefficient and the combustion parameter corresponding to the engine nitrogen oxide emission amount at the end of the service life of the engine system, the second sum value being used as the diesel engine combustion parameter.

[0025] Optionally, when the comparison result is that the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the time of the best liquid economy, the step of determining the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission amount comprises:

[0026] determining the diesel engine combustion parameter as the combustion parameter corresponding to the engine nitrogen oxide emission amount at the time of the best liquid economy.

[0027] In a second aspect, the present application further provides a diesel engine combustion parameter adjustment device, which comprises:

[0028] an acquisition module, configured to acquire the combustion parameter corresponding to each preset nitrogen oxide emission amount;

[0029] a calculation module, configured to calculate an engine nitrogen oxide target emission amount based on an engine system nitrogen oxide standard emission amount and a nitrogen oxide conversion efficiency;

[0030] a comparison module, configured to compare the engine nitrogen oxide target emission amount with each preset nitrogen oxide emission amount to obtain a comparison result;

[0031] a parameter determination module, configured to determine a diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission amount.

[0032] In a third aspect, the present application provides a diesel engine combustion parameter adjustment device, which comprises a processor, a memory, and a diesel engine combustion parameter adjustment program stored in the memory and executable by the processor, wherein the diesel engine combustion parameter adjustment program, when executed by the processor, implements the steps of the diesel engine combustion parameter adjustment method as described above.

[0033] In a fourth aspect, the present application provides a readable storage medium, which stores a diesel engine combustion parameter adjustment program, wherein the diesel engine combustion parameter adjustment program, when executed by a processor, implements the steps of the diesel engine combustion parameter adjustment method as described above.

[0034] In the present application, the combustion parameters corresponding to each preset nitrogen oxide emission amount are obtained; the engine nitrogen oxide target emission amount is calculated based on the engine system nitrogen oxide standard emission amount and the nitrogen oxide conversion efficiency; the engine nitrogen oxide target emission amount is compared with each preset nitrogen oxide emission amount to obtain a comparison result; and the diesel engine combustion parameter is determined based on the comparison result and the combustion parameters corresponding to each preset nitrogen oxide emission amount. Through the present application, the engine nitrogen oxide target emission amount emitted by the diesel engine system is monitored in real time, and the diesel engine combustion parameter is adjusted according to the actual engine nitrogen oxide target emission amount, i.e., the diesel engine combustion parameter is determined from the combustion parameters corresponding to each preset nitrogen oxide emission amount, so that the engine can reduce the vehicle operating cost as much as possible under the premise of meeting the emission regulations, improve the liquid economy and the robustness of nitrogen oxide emission, and solve the problem that the liquid economy cannot be reduced under the premise of meeting the nitrogen oxide emission requirements. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The figure is a flowchart of an embodiment of the diesel engine combustion parameter adjustment method of the present application;

[0036] Figure 2 The figure is a flowchart of an embodiment of the diesel engine combustion parameter adjustment method of the present application; Figure 1 The figure is a first detailed flowchart of step S40 in the embodiment of the diesel engine combustion parameter adjustment method of the present application;

[0037] Figure 3 The figure is a second detailed flowchart of step S40 in the embodiment of the diesel engine combustion parameter adjustment method of the present application; Figure 1 The figure is a second detailed flowchart of step S40 in the embodiment of the diesel engine combustion parameter adjustment method of the present application;

[0038] Figure 4 The figure is a functional module diagram of an embodiment of the diesel engine combustion parameter adjustment device of the present application;

[0039] Figure 5 The figure is a hardware structure diagram of the diesel engine combustion parameter adjustment device involved in the embodiment of the present application.

[0040] The objectives, functional characteristics and advantages of the present application will be further illustrated in conjunction with the embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

[0042] In a first aspect, the embodiments of the present application provide a diesel engine combustion parameter adjustment method.

[0043] In an embodiment, the diesel engine combustion parameter adjustment method comprises the following steps. Figure 1 Figure 1 FIG. 1 is a flowchart of an embodiment of the diesel engine combustion parameter adjustment method of the present application. As shown in FIG. 1, the diesel engine combustion parameter adjustment method comprises the following steps. Figure 1

[0044] In step S10, combustion parameters corresponding to each preset nitrogen oxide emission amount are obtained.

[0045] In this embodiment, the engine is tested for multiple combustion parameters at several special working points, and the specific fuel consumption (g / kWh) and nitrogen oxide emission amount (g / kWh) at each working point are recorded, and a relationship curve between the specific fuel consumption (g / kWh) and the nitrogen oxide emission amount (g / kWh) is drawn. Each nitrogen oxide emission amount corresponding to each preset nitrogen oxide emission amount is obtained on the relationship curve between the specific fuel consumption (g / kWh) and the nitrogen oxide emission amount (g / kWh), each working point corresponding to each nitrogen oxide emission amount corresponding to each preset nitrogen oxide emission amount is determined, and the combustion parameters corresponding to each working point are obtained. According to the corresponding relationship between the combustion parameters corresponding to each working point, each working point corresponding to each nitrogen oxide emission amount, and each nitrogen oxide emission amount corresponding to each preset nitrogen oxide emission amount, the combustion parameters corresponding to each preset nitrogen oxide emission amount can be determined.

[0046] In step S20, the engine nitrogen oxide target emission amount is calculated based on the engine system nitrogen oxide standard emission amount and the nitrogen oxide conversion efficiency.

[0047] In this embodiment, the nitrogen oxide emission amount NO xout_ measured by the SCR outlet nitrogen oxide sensor and the nitrogen oxide emission amount NO x_in measured by the SCR inlet nitrogen oxide sensor are substituted into the formula to calculate the nitrogen oxide conversion efficiency η. The nitrogen oxide conversion efficiency η and the engine system nitrogen oxide standard emission amount BSNO x_limit are substituted into the formula ​​The engine nitrogen oxide target emission amount can be calculated. The engine system is composed of an engine and an aftertreatment system. The engine system emission is the pollutant generated by the engine and purified by the aftertreatment system, and the measuring point is at the outlet of the aftertreatment system. The engine emission is the pollutant generated by the engine and not purified by the aftertreatment system, and the measuring point is between the engine and the aftertreatment system. The engine system nitrogen oxide standard emission amount is the emission amount that meets the nitrogen oxide emission standard. The engine nitrogen oxide target emission amount is the engine nitrogen oxide emission amount formulated to make the engine system nitrogen oxide emission meet the emission standard.

[0048] In step S30, the engine nitrogen oxide target emission amount is compared with each preset nitrogen oxide emission amount to obtain a comparison result.

[0049] In this embodiment, the engine nitrogen oxide target emission amount is compared with each preset nitrogen oxide emission amount to obtain a comparison result, so as to determine the preset nitrogen oxide emission amount closest to the engine nitrogen oxide target emission amount.

[0050] In step S40, the diesel engine combustion parameters are determined based on the comparison result and the combustion parameters corresponding to each preset nitrogen oxide emission amount.

[0051] In this embodiment, the preset nitrogen oxide emission amount closest to the engine nitrogen oxide target emission amount is determined based on the comparison result. The combustion parameters corresponding to the preset nitrogen oxide emission amount closest to the engine nitrogen oxide target emission amount are selected from the combustion parameters corresponding to each preset nitrogen oxide emission amount. The combustion parameters of the diesel engine are determined based on the combustion parameters corresponding to the preset nitrogen oxide emission amount closest to the engine nitrogen oxide target emission amount. Through real-time monitoring of the nitrogen oxide emission of the diesel engine system, the combustion parameters are adjusted according to the actual nitrogen oxide emission amount, so as to reduce the vehicle operating cost as much as possible under the premise of meeting the emission regulations, and improve the liquid economy and the robustness of nitrogen oxide emission.

[0052] In the embodiment, the combustion parameters corresponding to each preset nitrogen oxide emission amount are obtained; the engine nitrogen oxide target emission amount is calculated based on the engine system nitrogen oxide standard emission amount and the nitrogen oxide conversion efficiency; the engine nitrogen oxide target emission amount is compared with each preset nitrogen oxide emission amount to obtain a comparison result; and the diesel engine combustion parameters are determined based on the comparison result and the combustion parameters corresponding to each preset nitrogen oxide emission amount. Through the embodiment, the engine nitrogen oxide target emission amount emitted by the diesel engine system is monitored in real time, the diesel engine combustion parameters are adjusted according to the actual engine nitrogen oxide target emission amount, that is, the diesel engine combustion parameters are determined from the combustion parameters corresponding to each preset nitrogen oxide emission amount, so that the engine can reduce the vehicle operation cost as much as possible under the premise of meeting the emission regulations, improve the liquid economy and the robustness of nitrogen oxide emission, and solve the problem that the liquid economy cannot be reduced under the premise of meeting the nitrogen oxide emission requirements.

[0053] Further, in an embodiment, the each preset nitrogen oxide emission amount includes: a minimum engine nitrogen oxide emission amount, an engine nitrogen oxide emission amount at the end of the service life of the engine system, and an engine nitrogen oxide emission amount at the best liquid economy, wherein the minimum engine nitrogen oxide emission amount is less than the engine nitrogen oxide emission amount at the end of the service life of the engine system, and the engine nitrogen oxide emission amount at the end of the service life of the engine system is less than the engine nitrogen oxide emission amount at the best liquid economy.

[0054] In the embodiment, each preset nitrogen oxide emission amount includes: a minimum engine nitrogen oxide emission amount affected by a piston, an oil injector injection cone angle, and a diesel injection advance angle, an engine nitrogen oxide emission amount at the end of the service life of the engine system affected by engine consistency and engine life end selective catalytic reduction (SCR) conversion efficiency, and an engine nitrogen oxide emission amount at the best liquid economy affected by the SCR conversion efficiency at the beginning of use, the ratio of urea to fuel, and the ratio of market fuel urea price, wherein the minimum engine nitrogen oxide emission amount is less than the engine nitrogen oxide emission amount at the end of the service life of the engine system, and the engine nitrogen oxide emission amount at the end of the service life of the engine system is less than the engine nitrogen oxide emission amount at the best liquid economy. Wherein the liquid economy = fuel consumption + urea solution consumption * K, the fuel consumption + urea solution consumption * K is minimum at the best liquid economy, and K is used to represent the quotient of the urea solution price divided by the fuel price.

[0055] Further, in an embodiment, the step of comparing the engine nitrogen oxide target emission amount with each preset nitrogen oxide emission amount to obtain a comparison result includes:

[0056] comparing the engine nitrogen oxide target emission amount with the minimum engine nitrogen oxide emission amount, the engine nitrogen oxide emission amount at the end of the engine system service life, and the engine nitrogen oxide emission amount at the best liquid economy;

[0057] The comparison result is that the engine nitrogen oxide target emission amount is less than or equal to the minimum engine nitrogen oxide emission amount, or the engine nitrogen oxide target emission amount is greater than the minimum engine nitrogen oxide emission amount and less than or equal to the engine nitrogen oxide emission amount at the end of the engine system service life, or the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the end of the engine system service life and less than or equal to the engine nitrogen oxide emission amount at the best liquid economy, or the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the best liquid economy.

[0058] In this embodiment, the engine nitrogen oxide target emission amount BSNOx_target is compared with the minimum engine nitrogen oxide emission amount BSNOx_1, the engine nitrogen oxide emission amount BSNOx_2 at the end of the engine system service life, and the engine nitrogen oxide emission amount BSNOx_3 at the best liquid economy. Since BSNOx_1 is less than BSNOx_2, and BSNOx_2 is less than BSNOx_3, the comparison result is that the engine nitrogen oxide target emission amount is less than or equal to the minimum engine nitrogen oxide emission amount (BSNOx_target≤BSNOx_1), or the engine nitrogen oxide target emission amount is greater than the minimum engine nitrogen oxide emission amount and less than or equal to the engine nitrogen oxide emission amount at the end of the engine system service life (BSNOx_1<BSNOx_target≤BSNOx_2), or the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the end of the engine system service life and less than or equal to the engine nitrogen oxide emission amount at the best liquid economy (BSNOx_2<BSNOx_target≤BSNOx_3), or the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the best liquid economy (BSNOx_target>BSNOx_3).

[0059] Further, in an embodiment, when the comparison result is that the engine nitrogen oxide target emission amount is less than or equal to the minimum engine nitrogen oxide emission amount, the step of determining the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission amount comprises:

[0060] determining the diesel engine combustion parameter as the combustion parameter corresponding to the minimum engine nitrogen oxide emission amount.

[0061] In the embodiment, when the comparison result is that the engine nitrogen oxide target emission amount is less than or equal to the minimum engine nitrogen oxide emission amount (BSNOx_target≤BSNOx_1), the combustion parameter corresponding to the minimum engine nitrogen oxide emission amount is the combustion parameter of the diesel engine.

[0062] Further, in an embodiment, when the comparison result is that the engine nitrogen oxide target emission amount is greater than the minimum engine nitrogen oxide emission amount and less than or equal to the engine nitrogen oxide emission amount at the end of the service life of the engine system, the step of determining the combustion parameter of the diesel engine based on the comparison result and the combustion parameter corresponding to each preset engine nitrogen oxide emission amount comprises:

[0063] calculating a first difference between the engine nitrogen oxide target emission amount and the minimum engine nitrogen oxide emission amount and a second difference between the engine nitrogen oxide emission amount at the end of the service life of the engine system and the minimum engine nitrogen oxide emission amount;

[0064] calculating a quotient of the first difference divided by the second difference, and taking the quotient as a first weighting coefficient;

[0065] calculating a third difference between the combustion parameter corresponding to the engine nitrogen oxide emission amount at the end of the service life of the engine system and the combustion parameter corresponding to the minimum engine nitrogen oxide emission amount;

[0066] calculating a first sum of the third difference multiplied by the first weighting coefficient and the combustion parameter corresponding to the minimum engine nitrogen oxide emission amount, and taking the first sum as the combustion parameter of the diesel engine.

[0067] In the embodiment, when the engine nitrogen oxide target emission amount is greater than the minimum engine nitrogen oxide emission amount and less than or equal to the engine nitrogen oxide emission amount at the end of the service life of the engine system (BSNOx_1<BSNOx_target≤BSNOx_2), a first difference between the engine nitrogen oxide target emission amount and the minimum engine nitrogen oxide emission amount and a second difference between the engine nitrogen oxide emission amount at the end of the service life of the engine system and the minimum engine nitrogen oxide emission amount are calculated, a quotient of the first difference divided by the second difference is calculated, and the obtained quotient is taken as a first weighting coefficient k1, i.e.

[0068]

[0069] The third difference value of the combustion parameter corresponding to the engine nitrogen oxide emission amount at the end of the engine system service life minus the combustion parameter corresponding to the minimum engine nitrogen oxide emission amount is calculated, and a first sum value of the combustion parameter corresponding to the minimum engine nitrogen oxide emission amount plus the product of the third difference value multiplied by the first trade-off coefficient is calculated, and the first sum value is taken as the diesel engine combustion parameter. Specifically, if the combustion parameter includes the injection quantity, the rail pressure and the advance angle, the injection quantity I of the diesel engine is calculated as I=k1(I2-I1)+I1, the rail pressure P of the diesel engine is calculated as P=k1(P2-P1)+P1, and the advance angle T of the diesel engine is calculated as T=k1(T2-T1)+T1. Wherein, I1 is used to represent the injection quantity corresponding to the minimum engine nitrogen oxide emission amount, I2 is used to represent the injection quantity corresponding to the engine nitrogen oxide emission amount at the end of the engine system service life, P1 is used to represent the rail pressure corresponding to the minimum engine nitrogen oxide emission amount, P2 is used to represent the rail pressure corresponding to the engine nitrogen oxide emission amount at the end of the engine system service life, T1 is used to represent the advance angle corresponding to the minimum engine nitrogen oxide emission amount, and T2 is used to represent the advance angle corresponding to the engine nitrogen oxide emission amount at the end of the engine system service life. It should be noted that if the combustion parameter also includes other variables, the calculation method is the same.

[0070] Further, in an embodiment, when the comparison result is that the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the end of the engine system service life and less than or equal to the engine nitrogen oxide emission amount at the best liquid economy, the step of determining the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission amount comprises:

[0071] calculating a fourth difference value of the engine nitrogen oxide target emission amount minus the engine nitrogen oxide emission amount at the end of the engine system service life and a fifth difference value of the engine nitrogen oxide emission amount at the best liquid economy minus the engine nitrogen oxide emission amount at the end of the engine system service life;

[0072] calculating a quotient of the fourth difference value divided by the fifth difference value, and taking the quotient as a second trade-off coefficient;

[0073] calculating a sixth difference value of the combustion parameter corresponding to the engine nitrogen oxide emission amount at the best liquid economy minus the combustion parameter corresponding to the engine nitrogen oxide emission amount at the end of the engine system service life;

[0074] calculating a second sum value of the combustion parameter corresponding to the engine nitrogen oxide emission amount at the end of the engine system service life plus the product of the sixth difference value multiplied by the second trade-off coefficient, and taking the second sum value as the diesel engine combustion parameter.

[0075] In the embodiment, when the comparison result is that the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the end of the service life of the engine system and less than or equal to the engine nitrogen oxide emission amount at the best liquid economy (BSNOx_2<BSNOx_target≤BSNOx_3), a fourth difference value of the engine nitrogen oxide target emission amount minus the engine nitrogen oxide emission amount at the end of the service life of the engine system and a fifth difference value of the engine nitrogen oxide emission amount at the best liquid economy minus the engine nitrogen oxide emission amount at the end of the service life of the engine system are calculated, a quotient of the fourth difference value divided by the fifth difference value is calculated, and the obtained quotient is taken as the second trade-off coefficient k2, that is,

[0076] A sixth difference value of the combustion parameter corresponding to the engine nitrogen oxide emission amount at the best liquid economy minus the combustion parameter corresponding to the engine nitrogen oxide emission amount at the end of the service life of the engine system is calculated, and a second sum value of the product of the obtained sixth difference value multiplied by the second trade-off coefficient plus the combustion parameter corresponding to the engine nitrogen oxide emission amount at the end of the service life of the engine system is calculated, and the second sum value is taken as the diesel engine combustion parameter. Specifically, if the combustion parameter includes the injection amount, the rail pressure, and the advance angle, the injection amount I of the diesel engine is calculated as I=k2(I3-I2)+I2, the rail pressure P of the diesel engine is calculated as P=k2(P3-P2)+P2, and the advance angle T of the diesel engine is calculated as T=k2(T3-T2)+T2. Wherein I2 represents the injection amount corresponding to the engine nitrogen oxide emission amount at the end of the service life of the engine system, I3 represents the injection amount corresponding to the engine nitrogen oxide emission amount at the best liquid economy, P2 represents the rail pressure corresponding to the engine nitrogen oxide emission amount at the end of the service life of the engine system, P3 represents the rail pressure corresponding to the engine nitrogen oxide emission amount at the best liquid economy, T2 represents the advance angle corresponding to the engine nitrogen oxide emission amount at the end of the service life of the engine system, and T3 represents the advance angle corresponding to the engine nitrogen oxide emission amount at the best liquid economy. It should be noted that if the combustion parameter also includes other variables, the calculation method is the same.

[0077] Further, in an embodiment, when the comparison result is that the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the best liquid economy, the step of determining the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission amount comprises:

[0078] The diesel engine combustion parameter is determined as the combustion parameter corresponding to the engine nitrogen oxide emission amount at the best liquid economy.

[0079] In the embodiment, when the comparison result is that the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the time of the best liquid economy (BSNOx_target>BSNOx_3), the combustion parameter corresponding to the engine nitrogen oxide emission amount at the time of the best liquid economy is the combustion parameter of the diesel engine.

[0080] In a second aspect, the embodiment of the present application further provides a diesel engine combustion parameter adjusting device.

[0081] In an embodiment, the diesel engine combustion parameter adjusting device comprises: Figure 4 , Figure 4 FIG. 1 is a schematic diagram of functional modules of an embodiment of the diesel engine combustion parameter adjusting device according to the present application. Figure 4 As shown in FIG. 1, the diesel engine combustion parameter adjusting device comprises:

[0082] an obtaining module 10, configured to obtain a combustion parameter corresponding to each preset nitrogen oxide emission amount;

[0083] a calculating module 20, configured to calculate an engine nitrogen oxide target emission amount based on an engine system nitrogen oxide standard emission amount and a nitrogen oxide conversion efficiency;

[0084] a comparing module 30, configured to compare the engine nitrogen oxide target emission amount with each preset nitrogen oxide emission amount to obtain a comparison result;

[0085] a parameter determining module 40, configured to determine a diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission amount.

[0086] Further, in an embodiment, the each preset nitrogen oxide emission amount comprises: a minimum engine nitrogen oxide emission amount, an engine nitrogen oxide emission amount at the end of the service life of the engine system, and an engine nitrogen oxide emission amount at the time of the best liquid economy, wherein the minimum engine nitrogen oxide emission amount is less than the engine nitrogen oxide emission amount at the end of the service life of the engine system, and the engine nitrogen oxide emission amount at the end of the service life of the engine system is less than the engine nitrogen oxide emission amount at the time of the best liquid economy.

[0087] Further, in an embodiment, the comparing module 30 is configured to:

[0088] compare the engine nitrogen oxide target emission amount with the minimum engine nitrogen oxide emission amount, the engine nitrogen oxide emission amount at the end of the service life of the engine system, and the engine nitrogen oxide emission amount at the time of the best liquid economy;

[0089] the comparison result is that the engine nitrogen oxide target emission amount is less than or equal to the minimum engine nitrogen oxide emission amount, or the engine nitrogen oxide target emission amount is greater than the minimum engine nitrogen oxide emission amount and less than or equal to the engine nitrogen oxide emission amount at the end of the service life of the engine system, or the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the end of the service life of the engine system and less than or equal to the engine nitrogen oxide emission amount at the best liquid economy, or the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the best liquid economy.

[0090] Further, in an embodiment, when the comparison result is that the engine nitrogen oxide target emission amount is less than or equal to the minimum engine nitrogen oxide emission amount, the parameter determination module 40 is specifically configured to:

[0091] determine the diesel engine combustion parameter as the combustion parameter corresponding to the minimum engine nitrogen oxide emission amount.

[0092] Further, in an embodiment, when the comparison result is that the engine nitrogen oxide target emission amount is greater than the minimum engine nitrogen oxide emission amount and less than or equal to the engine nitrogen oxide emission amount at the end of the service life of the engine system, the parameter determination module 40 is specifically configured to:

[0093] calculate a first difference between the engine nitrogen oxide target emission amount and the minimum engine nitrogen oxide emission amount and a second difference between the engine nitrogen oxide emission amount at the end of the service life of the engine system and the minimum engine nitrogen oxide emission amount;

[0094] calculate a quotient of the first difference divided by the second difference, and take the quotient as a first trade-off coefficient;

[0095] calculate a third difference between the combustion parameter corresponding to the engine nitrogen oxide emission amount at the end of the service life of the engine system and the combustion parameter corresponding to the minimum engine nitrogen oxide emission amount;

[0096] calculate a first sum of the third difference multiplied by the first trade-off coefficient and the combustion parameter corresponding to the minimum engine nitrogen oxide emission amount, and take the first sum as the diesel engine combustion parameter.

[0097] Further, in an embodiment, when the comparison result is that the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the end of the service life of the engine system and less than or equal to the engine nitrogen oxide emission amount at the best liquid economy, the parameter determination module 40 is specifically configured to:

[0098] a fourth difference value between the target engine NOx emission and the engine NOx emission at the end of the engine system service life, and a fifth difference value between the engine NOx emission at the best liquid economy and the engine NOx emission at the end of the engine system service life;

[0099] calculating a quotient of the fourth difference value divided by the fifth difference value, and taking the quotient as a second trade-off coefficient;

[0100] calculating a sixth difference value between the combustion parameter corresponding to the engine NOx emission at the best liquid economy and the combustion parameter corresponding to the engine NOx emission at the end of the engine system service life;

[0101] calculating a second sum value of a product of the sixth difference value multiplied by the second trade-off coefficient and the combustion parameter corresponding to the engine NOx emission at the end of the engine system service life, and taking the second sum value as the diesel engine combustion parameter.

[0102] Further, in an embodiment, when the comparison result is that the target engine NOx emission is greater than the engine NOx emission at the best liquid economy, the parameter determination module 40 is specifically configured to:

[0103] determine the diesel engine combustion parameter as the combustion parameter corresponding to the engine NOx emission at the best liquid economy.

[0104] The functions of the modules in the diesel engine combustion parameter adjustment apparatus correspond to the steps in the diesel engine combustion parameter adjustment method, and the functions and implementation processes of the modules are not described here again.

[0105] In a third aspect, an embodiment of the present application provides a diesel engine combustion parameter adjustment device. The diesel engine combustion parameter adjustment device can be a personal computer (PC), a notebook computer, a server, or other device with data processing function.

[0106] Reference Figure 5 , Figure 5Fig. 1 is a schematic diagram of a hardware structure of the diesel engine combustion parameter adjustment device according to an embodiment of the present application. In the embodiment of the present application, the diesel engine combustion parameter adjustment device can include a processor 1001 (for example, a central processing unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is configured to realize the connection and communication among the components; the user interface 1003 can include a display and an input unit such as a keyboard; the network interface 1004 can optionally include a standard wired interface, a wireless interface (for example, a WI-FI interface), and the memory 1005 can be a random access memory (RAM) or a non-volatile memory such as a disk memory, and the memory 1005 can optionally be a storage device independent of the processor 1001. Those skilled in the art can understand that the hardware structure shown in Fig. 1 does not constitute a limitation on the present application, and can include more or fewer components than those shown in the figure, or combine some components, or arrange different components. Figure 5 The hardware structure shown in Fig. 1 does not constitute a limitation on the present application, and can include more or fewer components than those shown in the figure, or combine some components, or arrange different components.

[0107] With reference to the foregoing description of the diesel engine combustion parameter adjustment method, the diesel engine combustion parameter adjustment device according to the embodiment of the present application can be configured to execute the diesel engine combustion parameter adjustment method. Figure 5 Figure 5 The memory 1005 as a computer storage medium in the embodiment of the present application can include an operating system, a network communication module, a user interface module, and a diesel engine combustion parameter adjustment program. The processor 1001 can call the diesel engine combustion parameter adjustment program stored in the memory 1005, and execute the diesel engine combustion parameter adjustment method provided by the embodiment of the present application.

[0108] In a fourth aspect, the embodiment of the present application further provides a readable storage medium.

[0109] The diesel engine combustion parameter adjustment program is stored on the readable storage medium of the present application, and when the diesel engine combustion parameter adjustment program is executed by a processor, the steps of the diesel engine combustion parameter adjustment method described above are realized.

[0110] The method realized when the diesel engine combustion parameter adjustment program is executed can refer to each embodiment of the diesel engine combustion parameter adjustment method of the present application, and will not be described herein.

[0111] ​It should be noted that, in this document, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0112] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0113] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of software and the necessary general hardware platform, of course, they can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) as described above, and includes a number of instructions for causing a terminal device to execute the methods described in the various embodiments of the present application.

[0114] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation made by using the content of the specification and drawings, or directly or indirectly applied to other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method of adjusting a combustion parameter of a diesel engine, characterized by, The diesel engine combustion parameter adjusting method comprises: obtaining a combustion parameter corresponding to each preset nitrogen oxide emission amount; calculating an engine nitrogen oxide target emission amount based on an engine system nitrogen oxide standard emission amount and a nitrogen oxide conversion efficiency; comparing the engine nitrogen oxide target emission amount with each preset nitrogen oxide emission amount to obtain a comparison result; determining a diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission amount; each preset nitrogen oxide emission amount comprises: a minimum engine nitrogen oxide emission amount, an engine nitrogen oxide emission amount at the end of engine system use, and an engine nitrogen oxide emission amount at the best liquid economy, wherein the minimum engine nitrogen oxide emission amount is less than the engine nitrogen oxide emission amount at the end of engine system use, and the engine nitrogen oxide emission amount at the end of engine system use is less than the engine nitrogen oxide emission amount at the best liquid economy; wherein liquid economy = fuel consumption + urea solution consumption * K, K is used to represent the quotient of the price of urea solution divided by the price of fuel; the engine nitrogen oxide emission amount at the end of engine system use is affected by engine consistency and engine life end selective catalytic reduction (SCR) conversion efficiency; the step of comparing the engine nitrogen oxide target emission amount with each preset nitrogen oxide emission amount to obtain a comparison result comprises: comparing the engine nitrogen oxide target emission amount with the minimum engine nitrogen oxide emission amount, the engine nitrogen oxide emission amount at the end of engine system use, and the engine nitrogen oxide emission amount at the best liquid economy; the comparison result is that the engine nitrogen oxide target emission amount is less than or equal to the minimum engine nitrogen oxide emission amount, or the engine nitrogen oxide target emission amount is greater than the minimum engine nitrogen oxide emission amount and less than or equal to the engine nitrogen oxide emission amount at the end of engine system use, or the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the end of engine system use and less than or equal to the engine nitrogen oxide emission amount at the best liquid economy, or the engine nitrogen oxide target emission amount is greater than the engine nitrogen oxide emission amount at the best liquid economy; when the comparison result is that the engine nitrogen oxide target emission amount is greater than the minimum engine nitrogen oxide emission amount and less than or equal to the engine nitrogen oxide emission amount at the end of engine system use, the step of determining a diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission amount comprises: calculating a first difference value of the engine nitrogen oxide target emission amount minus the minimum engine nitrogen oxide emission amount and a second difference value of the engine nitrogen oxide emission amount at the end of engine system use minus the minimum engine nitrogen oxide emission amount; calculating a first quotient of the first difference value divided by the second difference value, taking the first quotient as a first trade-off coefficient; calculating a third difference value of the combustion parameter corresponding to the engine nitrogen oxide emission amount at the end of engine system use minus the combustion parameter corresponding to the minimum engine nitrogen oxide emission amount; adding a first sum of the product of the third difference multiplied by the first trade-off coefficient and the combustion parameter corresponding to the minimum engine nitrogen oxide emission to the combustion parameter corresponding to the minimum engine nitrogen oxide emission as the diesel engine combustion parameter.

2. The diesel combustion parameter adjustment method according to claim 1, characterized by, When the comparison result is that the engine nitrogen oxide target emission is less than or equal to the minimum engine nitrogen oxide emission, the step of determining the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission includes: determining the diesel engine combustion parameter as the combustion parameter corresponding to the minimum engine nitrogen oxide emission.

3. The diesel combustion parameter adjustment method of claim 1 wherein, When the comparison result is that the engine nitrogen oxide target emission is greater than the engine nitrogen oxide emission at the end of the service life of the engine system and less than or equal to the engine nitrogen oxide emission at the best liquid economy, the step of determining the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission includes: calculating a fourth difference of the engine nitrogen oxide target emission minus the engine nitrogen oxide emission at the end of the service life of the engine system and a fifth difference of the engine nitrogen oxide emission at the best liquid economy minus the engine nitrogen oxide emission at the end of the service life of the engine system; calculating a second quotient of the fourth difference divided by the fifth difference as a second trade-off coefficient; calculating a sixth difference of the combustion parameter corresponding to the engine nitrogen oxide emission at the best liquid economy minus the combustion parameter corresponding to the engine nitrogen oxide emission at the end of the service life of the engine system; adding a second sum of the product of the sixth difference multiplied by the second trade-off coefficient and the combustion parameter corresponding to the engine nitrogen oxide emission at the end of the service life of the engine system to the combustion parameter corresponding to the engine nitrogen oxide emission at the end of the service life of the engine system as the diesel engine combustion parameter.

4. The diesel combustion parameter adjustment method of claim 1 wherein, When the comparison result is that the engine nitrogen oxide target emission is greater than the engine nitrogen oxide emission at the best liquid economy, the step of determining the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission includes: determining the diesel engine combustion parameter as the combustion parameter corresponding to the engine nitrogen oxide emission at the best liquid economy.

5. A diesel combustion parameter adjusting device characterized by comprising: The diesel engine combustion parameter adjustment device includes: an acquisition module configured to acquire the combustion parameter corresponding to each preset nitrogen oxide emission; a calculation module configured to calculate the engine nitrogen oxide target emission based on the engine system nitrogen oxide standard emission and the nitrogen oxide conversion efficiency; a comparison module configured to compare the engine nitrogen oxide target emission with each preset nitrogen oxide emission to obtain a comparison result; a parameter determination module configured to determine the diesel engine combustion parameter based on the comparison result and the combustion parameter corresponding to each preset nitrogen oxide emission. The each preset nitrogen oxide emission quantity comprises: a minimum engine nitrogen oxide emission quantity, an engine system end-of-life engine nitrogen oxide emission quantity, and a liquid economy best engine nitrogen oxide emission quantity, wherein the minimum engine nitrogen oxide emission quantity is less than the engine system end-of-life engine nitrogen oxide emission quantity, and the engine system end-of-life engine nitrogen oxide emission quantity is less than the liquid economy best engine nitrogen oxide emission quantity; wherein liquid economy = fuel consumption + urea solution consumption * K, K is used to represent the quotient of the urea solution price divided by the fuel price; the engine system end-of-life engine nitrogen oxide emission quantity is affected by engine consistency and engine life end selective catalytic reduction (SCR) conversion efficiency; The comparison module is used for: The step of comparing the engine nitrogen oxide target emission quantity with each preset nitrogen oxide emission quantity to obtain a comparison result comprises: The engine nitrogen oxide target emission quantity is compared with the minimum engine nitrogen oxide emission quantity, the engine system end-of-life engine nitrogen oxide emission quantity, and the liquid economy best engine nitrogen oxide emission quantity; The comparison result is that the engine nitrogen oxide target emission quantity is less than or equal to the minimum engine nitrogen oxide emission quantity, or the engine nitrogen oxide target emission quantity is greater than the minimum engine nitrogen oxide emission quantity and less than or equal to the engine system end-of-life engine nitrogen oxide emission quantity, or the engine nitrogen oxide target emission quantity is greater than the engine system end-of-life engine nitrogen oxide emission quantity and less than or equal to the liquid economy best engine nitrogen oxide emission quantity, or the engine nitrogen oxide target emission quantity is greater than the liquid economy best engine nitrogen oxide emission quantity; When the comparison result is that the engine nitrogen oxide target emission quantity is greater than the minimum engine nitrogen oxide emission quantity and less than or equal to the engine system end-of-life engine nitrogen oxide emission quantity, the parameter determination module is specifically used for: A first difference value of the engine nitrogen oxide target emission quantity minus the minimum engine nitrogen oxide emission quantity and a second difference value of the engine system end-of-life engine nitrogen oxide emission quantity minus the minimum engine nitrogen oxide emission quantity are calculated; A first quotient of the first difference value divided by the second difference value is calculated, and the first quotient is used as a first trade-off coefficient; A third difference value of a combustion parameter corresponding to the engine system end-of-life engine nitrogen oxide emission quantity minus a combustion parameter corresponding to the minimum engine nitrogen oxide emission quantity is calculated; A first sum value of the third difference value multiplied by the first trade-off coefficient and the combustion parameter corresponding to the minimum engine nitrogen oxide emission quantity is calculated, and the first sum value is used as the diesel engine combustion parameter.

6. A diesel combustion parameter adjusting apparatus characterized by comprising: The diesel engine combustion parameter adjustment device comprises a processor, a memory, and a diesel engine combustion parameter adjustment program stored on the memory and executable by the processor, wherein when the diesel engine combustion parameter adjustment program is executed by the processor, the steps of the diesel engine combustion parameter adjustment method in any one of claims 1 to 4 are implemented.

7. A readable storage medium, characterized by, The readable storage medium has stored thereon a diesel engine combustion parameter adjustment program, wherein the diesel engine combustion parameter adjustment program, when executed by a processor, implements the steps of the diesel engine combustion parameter adjustment method according to any one of claims 1 to 4.

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