An exhaust temperature adjusting method and device, electronic equipment and storage medium

Abstract

The application discloses an exhaust temperature adjusting method and device, electronic equipment and a storage medium, and relates to the technical field of engines. The method comprises the following steps: obtaining matched expected exhaust manifold pressure and expected exhaust temperature according to engine speed and engine single-cycle fuel injection amount; obtaining actual exhaust manifold pressure according to upstream pressure of an exhaust temperature management valve, engine exhaust flow, downstream temperature of the exhaust temperature management valve, expected exhaust manifold pressure and expected exhaust temperature; and controlling the opening degree of the exhaust temperature management valve according to the pressure difference between the expected exhaust manifold pressure and the actual exhaust manifold pressure, so as to adjust the exhaust temperature through the opening degree of the exhaust temperature management valve. The technical scheme of the embodiment of the application realizes closed-loop control of the exhaust temperature based on the exhaust manifold pressure, greatly improves the adjusting accuracy of the exhaust temperature by calculating the actual exhaust manifold pressure, and avoids the influence of engine working conditions on the detection accuracy of sensors.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to an exhaust temperature regulation method, device, electronic equipment, and storage medium. Background Technology

[0002] Exhaust temperature is an important parameter of the engine, which not only affects the emission of harmful substances, but also directly affects the operational safety of engine components such as the combustion chamber, turbine blades and tailpipe. Therefore, effective regulation of exhaust temperature has become an important part of engine technology.

[0003] Existing exhaust temperature regulation components include intake throttle valves, cylinder deactivation systems, late injection systems, electric heaters, and burners. In traditional technical solutions, exhaust temperature regulation is usually achieved by directly acquiring the engine's exhaust temperature using temperature sensors and other detection devices, and then controlling the operating parameters of the currently used exhaust temperature regulation components based on the exhaust temperature to achieve exhaust temperature regulation.

[0004] However, with this adjustment method, the temperature sensor and other detection devices are often affected by the engine operating conditions, resulting in large detection deviations, which in turn reduces the accuracy of exhaust temperature regulation. At the same time, the aforementioned exhaust temperature regulation components also have the problem of poor regulation efficiency. Summary of the Invention

[0005] This invention provides an exhaust temperature regulation method, device, electronic device, and storage medium to solve the problem of low exhaust temperature regulation accuracy.

[0006] According to one aspect of the present invention, an exhaust temperature regulation method is provided, comprising:

[0007] Based on the engine speed and the amount of fuel injected in a single engine cycle, obtain the desired exhaust manifold pressure and desired exhaust temperature.

[0008] The actual exhaust manifold pressure is obtained based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature.

[0009] The differential pressure is obtained based on the desired exhaust manifold pressure and the actual exhaust manifold pressure, and the opening of the exhaust temperature management valve is controlled based on the differential pressure to regulate the exhaust temperature.

[0010] The process of obtaining the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature specifically includes: obtaining the actual intake efficiency based on the intake manifold pressure, engine speed, and desired exhaust manifold pressure; and obtaining the engine exhaust flow rate based on the actual intake efficiency, theoretical intake volume, and fuel flow rate. By obtaining the engine exhaust flow rate using the above calculation method based on the obtained desired exhaust manifold pressure, the accuracy of the engine exhaust flow rate calculation is greatly improved, thereby increasing the actual exhaust manifold pressure obtained based on the engine exhaust flow rate and ensuring precise control of the exhaust temperature.

[0011] The process of obtaining the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature specifically includes: obtaining the upstream pressure of the exhaust temperature management valve based on the downstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the opening degree of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve. The upstream pressure of the exhaust temperature management valve calculated in this way reduces the oscillation effects of upstream components such as the turbocharger, exhaust manifold, and cylinders, thereby improving the numerical accuracy of the upstream pressure of the exhaust temperature management valve.

[0012] The process of obtaining the upstream pressure of the exhaust temperature management valve based on its downstream pressure, engine exhaust flow rate, valve opening degree, and downstream temperature specifically includes: obtaining the downstream pressure of the exhaust temperature management valve based on atmospheric pressure, engine exhaust flow rate, and downstream temperature. The downstream pressure of the exhaust temperature management valve calculated in this way further avoids the influence of oscillations from upstream components such as the turbine, exhaust manifold, and cylinders, thus improving the numerical accuracy of the downstream pressure of the exhaust temperature management valve.

[0013] The process of obtaining the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature specifically includes: sequentially calculating the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency; based on the current exhaust charging efficiency, continuing to sequentially calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency until the number of iterations reaches a preset iteration threshold, at which point the current exhaust manifold pressure is taken as the actual exhaust manifold pressure. This iterative calculation achieves the acquisition of the actual exhaust manifold pressure, avoiding the influence of engine exhaust flow rate calculation errors on the actual exhaust manifold pressure value, and further improving the calculation accuracy of the actual exhaust manifold pressure.

[0014] After sequentially calculating the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency, the process further includes: based on the current exhaust charging efficiency, continuing to sequentially calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency until the difference between the current exhaust manifold pressure and the desired exhaust manifold pressure is less than or equal to a preset difference threshold. At this point, the current exhaust manifold pressure is taken as the actual exhaust manifold pressure. This reduces the number of iterations, lowers computational complexity, and improves the efficiency of obtaining the actual exhaust manifold pressure.

[0015] The step of obtaining the differential pressure based on the desired exhaust manifold pressure and the actual exhaust manifold pressure includes: obtaining the corrected desired exhaust manifold pressure based on the temperature difference between the actual exhaust temperature and the desired exhaust temperature; and obtaining the differential pressure based on the corrected desired exhaust manifold pressure and the actual exhaust manifold pressure. This achieves temperature deviation compensation for exhaust temperature and improves the robustness of exhaust temperature control.

[0016] According to another aspect of the present invention, an exhaust temperature regulating device is provided, comprising:

[0017] The desired value acquisition module is used to obtain the matching desired exhaust manifold pressure and desired exhaust temperature based on the engine speed and the amount of fuel injected in a single engine cycle.

[0018] The actual value acquisition module is used to acquire the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature.

[0019] The exhaust temperature regulation module is used to obtain the differential pressure based on the desired exhaust manifold pressure and the actual exhaust manifold pressure, and to control the opening of the exhaust temperature management valve based on the differential pressure, so as to regulate the exhaust temperature by adjusting the opening of the exhaust temperature management valve.

[0020] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0021] At least one processor; and

[0022] A memory communicatively connected to the at least one processor; wherein,

[0023] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the exhaust temperature regulation method according to any embodiment of the present invention.

[0024] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the exhaust temperature regulation method according to any embodiment of the present invention.

[0025] The technical solution of this invention obtains the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, and the downstream temperature of the exhaust temperature management valve. Then, based on the pressure difference between the actual exhaust manifold pressure and the desired exhaust manifold pressure, the opening of the exhaust temperature management valve is controlled. This adjusts the exhaust temperature by controlling the opening of the exhaust temperature management valve, achieving closed-loop control of exhaust temperature based on exhaust manifold pressure. Compared to traditional solutions that rely on sensors for temperature and pressure detection, this method, by calculating the actual exhaust manifold pressure, significantly improves the accuracy of exhaust temperature regulation and avoids the influence of engine operating conditions on sensor detection accuracy. Furthermore, adjusting the engine exhaust temperature based on the opening of the exhaust temperature management valve also improves the efficiency of engine exhaust temperature regulation.

[0026] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1A This is a schematic diagram of the structure of a diesel engine provided according to an embodiment of the present invention;

[0029] Figure 1B This is a schematic diagram showing the position of the stagnant gas in the cylinder according to an embodiment of the present invention;

[0030] Figure 1C This is a flowchart of an exhaust temperature regulation method provided in Embodiment 1 of the present invention;

[0031] Figure 2 This is a flowchart of another exhaust temperature regulation method provided in Embodiment 2 of the present invention;

[0032] Figure 3 This is a flowchart of another exhaust temperature regulation method provided in Embodiment 3 of the present invention;

[0033] Figure 4This is a schematic diagram of another exhaust temperature regulating device provided in Embodiment 4 of the present invention.

[0034] Figure 5 This is a schematic diagram of the structure of an electronic device that implements the exhaust temperature regulation method of the present invention. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] Figure 1A This is a schematic diagram of the structure of a diesel engine disclosed in an embodiment of the present invention, as shown below. Figure 1A As shown, the cylinder's intake port is connected to the intake manifold, the cylinder's exhaust port is connected to the exhaust manifold, the exhaust manifold outlet is connected to the turbine, and the turbine outlet is connected to the exhaust temperature control valve. Under normal engine operating conditions, at the end of the exhaust stroke of a four-stroke engine, the residual exhaust gas in the engine will crowd out some of the fresh air entering, thus reducing the amount of fresh air. Figure 1B As shown, the stagnant exhaust gas itself occupies the space shown in volume 1 in the cylinder. After expanding in an isentropic manner, it occupies the space jointly occupied by volume 1 and volume 2. That is, the fresh air flowing into the cylinder will be further reduced due to the isentropic expansion of the stagnant exhaust gas. In this embodiment of the invention, the engine type is not specifically limited.

[0038] Example 1

[0039] Figure 1CThis is a flowchart of an exhaust temperature regulation method provided in Embodiment 1 of the present invention. This embodiment is applicable to adjusting the opening of the exhaust temperature management valve by calculating the actual exhaust manifold pressure to achieve exhaust temperature regulation. The exhaust temperature regulation device can be implemented in hardware and / or software, and is configured in electronic equipment, typically in the vehicle's engine or on-board terminal equipment. Figure 1C As shown, the method includes:

[0040] S101. Based on the engine speed and the amount of fuel injected in a single engine cycle, obtain the desired exhaust manifold pressure and desired exhaust temperature.

[0041] Engine speed reflects the number of times the engine performs work per unit time and the amount of effective power. It can be obtained directly from the corresponding sensor in the engine or from the engine control system. The fuel injection quantity per engine cycle is the amount of fuel injected into the cylinder in each cycle of engine operation. It can be calculated in various ways. In this embodiment of the invention, the fuel injection quantity per engine cycle can be obtained from the engine control system.

[0042] The pressure-temperature reference table is a pre-drawn data comparison table created by vehicle engineers based on experience. It pre-configures the ideal exhaust manifold pressure (i.e., the desired exhaust manifold pressure) and the ideal exhaust temperature (i.e., the desired exhaust temperature) at different engine speeds and single-cycle fuel injection quantities. Therefore, after obtaining the current engine speed and single-cycle fuel injection quantity, the desired exhaust manifold pressure and desired exhaust temperature can be obtained from the pressure-temperature reference table. Furthermore, the desired exhaust manifold pressure and desired exhaust temperature can be calculated using pre-configured formulas based on the current engine speed and single-cycle fuel injection quantity.

[0043] S103. Obtain the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature.

[0044] The downstream temperature of the exhaust temperature management valve, i.e., the temperature at the outlet of the exhaust temperature management valve, can be obtained from a temperature sensor at that location or from the engine control system, expressed in T. ex This indicates the downstream temperature of the exhaust temperature management valve; engine exhaust flow rate refers to the rate at which the engine discharges the exhaust gases produced after combustion during operation, and its value can also be obtained from the engine control system, expressed in M. exThis indicates the engine exhaust flow rate; the upstream pressure of the exhaust temperature management valve, i.e., the pressure at the inlet of the exhaust temperature management valve, can be obtained from a pressure sensor at that location or from the engine control system, expressed in P. in This indicates the upstream pressure of the exhaust temperature management valve. Additionally, P is used. ref and T ref These represent the desired exhaust manifold pressure and the desired exhaust temperature, respectively.

[0045] Therefore, after obtaining the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, and the downstream temperature of the exhaust temperature management valve, the actual exhaust manifold pressure can be obtained through the following equation:

[0046]

[0047] Here, g3 represents a calibrated one-dimensional data table, characterizing a one-dimensional function of the Saint-Venant curve, specifically reflecting the specific relationship between turbine flow rate and turbine end pressure ratio. -1 This represents the inverse function of g3, which is the function obtained by swapping the independent and dependent variables of g3.

[0048] Optionally, in this embodiment of the invention, obtaining the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature specifically includes: obtaining the actual intake efficiency based on the intake manifold pressure, the engine speed, and the desired exhaust manifold pressure; and obtaining the engine exhaust flow rate based on the actual intake efficiency, the theoretical intake volume, and the fuel flow rate.

[0049] Specifically, the engine's initial charging efficiency can be obtained using the following equation:

[0050] Eff raw =g(P im (Equation 1-2)

[0051] Among them, Eff raw P represents the engine's initial charging efficiency. im Indicates intake manifold pressure, Ne represents engine speed; g(P) im Ne) can be a calibrated data table, based on P im And Ne query to get the matching Eff raw The value can also be a value containing the parameter P. im Polynomials of and Ne;

[0052] The exhaust gas charging efficiency of an engine can be obtained using the following equation:

[0053] Effex =h(P ex ,Ne) (Equation 1-3)

[0054] Among them, Eff ex P represents the exhaust-charge efficiency of an engine. ex h(P) represents the exhaust manifold pressure. ex Ne) can represent a calibrated data table, according to P ex And Ne query to get the matching Eff ex The value can also be a value containing the parameter P. ex Polynomials of Ne.

[0055] Substitute the above (Equation 1-2) and (Equation 1-3) into the following equation:

[0056]

[0057] The engine's actual intake efficiency (Eff) can then be obtained; then, the engine's fresh air flow rate can be obtained according to the following equation:

[0058] M air =M theo *Eff (Equation 1-5)

[0059] Among them, M air M represents the fresh air flow rate. theo This represents the theoretical intake volume, which can be obtained using the following equation:

[0060]

[0061] Among them, T im The intake manifold temperature is indicated and can be obtained from a temperature sensor built into the engine; V im R represents the intake manifold volume; R represents the gas constant.

[0062] Finally, the engine exhaust flow rate can be obtained using the following equation:

[0063] M ex =M air +M f (Equation 1-7)

[0064] Among them, M ex M represents the engine exhaust flow rate. f The engine fuel flow rate can also be obtained through the engine control system.

[0065] Specifically, since the exhaust manifold pressure in the above technical solution is the final value to be determined, it is obviously unknown during the calculation of engine exhaust flow. Therefore, the expected exhaust manifold pressure can be used as this value to calculate the engine exhaust flow. Compared to the estimation of engine exhaust flow in traditional technical solutions, this embodiment of the invention obtains the engine exhaust flow based on the obtained expected exhaust manifold pressure using the above calculation method, greatly improving the calculation accuracy of engine exhaust flow. This, in turn, improves the actual exhaust manifold pressure obtained based on the engine exhaust flow, ensuring precise control of exhaust temperature.

[0066] Optionally, in this embodiment of the invention, obtaining the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature specifically includes: obtaining the upstream pressure of the exhaust temperature management valve based on the downstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the opening degree of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve.

[0067] Specifically, the upstream pressure of the exhaust temperature management valve can be obtained not only directly through the corresponding sensor or through the engine control system, but also calculated using the following equation:

[0068]

[0069] Among them, P out The pressure downstream of the exhaust temperature management valve is represented by , which can be obtained through a corresponding pressure sensor or through the engine control system; u represents the opening degree of the exhaust temperature management valve; g2 represents a calibrated one-dimensional data table, also characterizing a one-dimensional function of the Saint-Venant curve. -1 f3 represents the inverse function of g2, which is the function obtained by exchanging the independent and dependent variables of g2; f3 represents a calibrated one-dimensional data table that reflects the relationship between the opening degree of the exhaust temperature control valve and the area of ​​the effective flow cross section.

[0070] Due to the structural limitations of diesel engines, when a pressure sensor is installed upstream of the exhaust temperature management valve, it is significantly affected by the oscillations of upstream components such as the turbine, exhaust manifold, and cylinder. Therefore, compared to installing a pressure sensor downstream of the exhaust temperature management valve, the upstream pressure sensor has lower detection accuracy. Thus, a pressure sensor can be installed downstream of the exhaust temperature management valve to obtain a more accurate value of the downstream pressure. The upstream pressure of the exhaust temperature management valve can then be calculated based on the downstream pressure, thereby reducing the oscillation effects of upstream components such as the turbine, exhaust manifold, and cylinder, and improving the numerical accuracy of the upstream pressure of the exhaust temperature management valve.

[0071] Optionally, in this embodiment of the invention, obtaining the upstream pressure of the exhaust temperature management valve based on the downstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the opening degree of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve specifically includes: obtaining the downstream pressure of the exhaust temperature management valve based on atmospheric pressure, the engine exhaust flow rate, and the downstream temperature of the exhaust temperature management valve.

[0072] Specifically, the downstream pressure of the exhaust temperature management valve can be obtained not only through corresponding sensors or through the engine control system, but also calculated using the following equation:

[0073]

[0074] Among them, P a f1 represents atmospheric pressure; when exhaust manifold pressure is used as an independent variable in (Equation 1-8) and (Equation 1-9), the desired exhaust manifold pressure can also be substituted in; f2 represents a calibrated one-dimensional data table used to calculate the pressure difference between the two ends of the post-processor.

[0075] Even with a pressure sensor installed downstream of the exhaust temperature management valve, it is still affected by the oscillations of upstream components such as the turbine, exhaust manifold, and cylinder. Therefore, compared to installing a pressure sensor downstream of the exhaust temperature management valve, the downstream pressure of the exhaust temperature management valve calculated in the above manner further avoids the influence of oscillations of upstream components such as the turbine, exhaust manifold, and cylinder, thus improving the numerical accuracy of the downstream pressure of the exhaust temperature management valve.

[0076] S103. Obtain the differential pressure based on the desired exhaust manifold pressure and the actual exhaust manifold pressure, and control the opening of the exhaust temperature management valve based on the differential pressure to regulate the exhaust temperature through the opening of the exhaust temperature management valve.

[0077] After obtaining the differential pressure based on the desired exhaust manifold pressure and the actual exhaust manifold pressure, the opening degree of the exhaust temperature management valve is calculated by the proportional-integral controller based on the differential pressure. Then, by controlling the opening degree of the exhaust temperature management valve, the exhaust temperature of the engine is adjusted.

[0078] The technical solution of this invention obtains the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, and the downstream temperature of the exhaust temperature management valve. Then, based on the pressure difference between the actual exhaust manifold pressure and the desired exhaust manifold pressure, the opening of the exhaust temperature management valve is controlled. This adjusts the exhaust temperature by controlling the opening of the exhaust temperature management valve, achieving closed-loop control of exhaust temperature based on exhaust manifold pressure. Compared to traditional solutions that rely on sensors for temperature and pressure detection, this method, by calculating the actual exhaust manifold pressure, significantly improves the accuracy of exhaust temperature regulation and avoids the influence of engine operating conditions on sensor detection accuracy. Furthermore, adjusting the engine exhaust temperature based on the opening of the exhaust temperature management valve also improves the efficiency of engine exhaust temperature regulation.

[0079] Example 2

[0080] Figure 2 This is a flowchart of an exhaust temperature regulation method provided in Embodiment 2 of the present invention. Based on Embodiment 1, this embodiment performs iterative calculations based on engine exhaust flow rate and exhaust manifold pressure to obtain the actual exhaust manifold pressure after iteration. Figure 2 As shown, the method includes:

[0081] S201. Based on the engine speed and the amount of fuel injected in a single engine cycle, obtain the desired exhaust manifold pressure and desired exhaust temperature.

[0082] S202. Calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency in sequence.

[0083] Exhaust manifold pressure is affected by engine exhaust flow rate, and engine exhaust flow rate is also affected by exhaust manifold pressure; the two are mutually influencing variables. Therefore, through iterative calculation, both values ​​can be made to stabilize, thereby obtaining the convergent value after iteration, that is, the exhaust manifold pressure after iteration is taken as the actual exhaust manifold pressure. As shown in the above technical solution, in the initial state of iteration, the engine's exhaust charging efficiency Eff can be... ex Set to 0, and calculate the actual intake efficiency, downstream pressure of the exhaust temperature management valve, upstream pressure of the exhaust temperature management valve, exhaust manifold pressure and exhaust charging efficiency in sequence using the following formulas (2-1) to (2-5).

[0084]

[0085]

[0086]

[0087]

[0088] Eff ex =h(P ex (Equation 2-5)

[0089] S203. Based on the current exhaust charging efficiency, continue to calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency in sequence until the number of iterations reaches the preset iteration threshold. Then, take the current exhaust manifold pressure as the actual exhaust manifold pressure.

[0090] After completing one iteration calculation, the value of (Equation 2-5) is substituted into (Equation 2-1) and the next iteration calculation is performed until the number of iterations reaches the preset iteration threshold. Then, the current exhaust manifold pressure obtained by (Equation 2-4) is used as the actual exhaust manifold pressure. The preset iteration threshold can be configured as needed. For example, the preset iteration threshold can be set to 3 to 5 times.

[0091] S204. Obtain the differential pressure based on the desired exhaust manifold pressure and the actual exhaust manifold pressure, and control the opening of the exhaust temperature management valve based on the differential pressure to regulate the exhaust temperature.

[0092] Optionally, in this embodiment of the invention, after sequentially calculating the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency, the method further includes: based on the current exhaust charging efficiency, continuing to sequentially calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency until the difference between the current exhaust manifold pressure and the desired exhaust manifold pressure is less than or equal to a preset difference threshold, at which point the current exhaust manifold pressure is taken as the actual exhaust manifold pressure.

[0093] Specifically, when iterating the above calculation formula, if the calculated current exhaust manifold pressure is close to the expected exhaust manifold pressure, that is, the difference between the current exhaust manifold pressure and the expected exhaust manifold pressure is small, i.e., less than or equal to the preset difference threshold, it also indicates that the current exhaust manifold pressure has converged. At this time, even if the preset iteration threshold is not reached, it can be considered that a relatively accurate exhaust manifold pressure has been obtained. Therefore, the current exhaust manifold pressure is taken as the actual exhaust manifold pressure, thereby reducing the number of iterations, reducing the computational complexity, and improving the efficiency of obtaining the actual exhaust manifold pressure.

[0094] The technical solution of this invention obtains the actual exhaust manifold pressure by iteratively calculating the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency. This allows the actual exhaust manifold pressure to be obtained through iterative calculation even without knowing the engine exhaust flow rate, avoiding the influence of the calculation error of the engine exhaust flow rate on the numerical value of the actual exhaust manifold pressure, and further improving the calculation accuracy of the actual exhaust manifold pressure.

[0095] Example 3

[0096] Figure 3 This is a flowchart of an exhaust temperature adjustment method provided in Embodiment 3 of the present invention. Based on Embodiment 1, this embodiment adjusts the temperature according to the difference between the actual exhaust temperature and the desired exhaust temperature to obtain the corrected desired exhaust manifold pressure. Figure 3 As shown, the method includes:

[0097] S301. Based on the engine speed and the amount of fuel injected in a single engine cycle, obtain the desired exhaust manifold pressure and desired exhaust temperature.

[0098] S302. Obtain the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature.

[0099] S303. Obtain the corrected desired exhaust manifold pressure based on the temperature difference between the actual exhaust temperature and the desired exhaust temperature.

[0100] The actual exhaust temperature is detected by a sensor located downstream of the exhaust temperature management valve, which measures the downstream temperature of the valve. The desired exhaust temperature is obtained by consulting a pressure-temperature reference table. Based on the temperature difference between the two, if the difference is positive, a weighted positive table is called to obtain a matching weight value. Then, based on the maximum positive deviation of the intake manifold pressure, this weight value is multiplied by the maximum positive deviation. The product is then added to the desired exhaust manifold pressure to obtain the corrected desired exhaust manifold pressure. The weighted positive table pre-configures the correspondence between different temperature differences and weight values, with the weight values ​​ranging from 0 to 1. The maximum positive deviation of the intake manifold pressure is the upper limit threshold of the safe pressure value, representing the maximum allowable pressure value of the intake manifold, and can be configured and generated as needed.

[0101] Similarly, if the temperature difference is negative, the negative weight table is called to obtain the matching weight value. Then, based on the maximum negative deviation of the intake manifold pressure, the weight value is multiplied by the maximum positive deviation. The product is then added to the desired exhaust manifold pressure to obtain the corrected desired exhaust manifold pressure. The negative weight table pre-configures the correspondence between different temperature differences and weight values. The weight values ​​range from 0 to 1. The maximum negative deviation of the intake manifold pressure is the lower limit threshold of the safe pressure value, which represents the minimum allowable pressure value of the intake manifold. It can also be configured and generated as needed.

[0102] S304. Obtain the differential pressure based on the corrected expected exhaust manifold pressure and the actual exhaust manifold pressure.

[0103] S305. The opening degree of the exhaust temperature management valve is controlled according to the differential pressure, so as to regulate the exhaust temperature by adjusting the opening degree of the exhaust temperature management valve.

[0104] The technical solution of this invention, after obtaining the actual exhaust manifold pressure, obtains the corrected desired exhaust manifold pressure based on the temperature difference between the actual exhaust temperature and the desired exhaust temperature, and then obtains the difference pressure based on the corrected desired exhaust manifold pressure and the actual exhaust manifold pressure, thereby realizing temperature deviation compensation of exhaust temperature, that is, reducing the exhaust temperature when the exhaust temperature is too high and increasing the exhaust temperature when the exhaust temperature is too low, thus improving the control robustness of exhaust temperature.

[0105] Example 4

[0106] Figure 4 This is a structural block diagram of an exhaust temperature regulating device provided in Embodiment 4 of the present invention. The device specifically includes:

[0107] The desired value acquisition module 401 is used to acquire the matching desired exhaust manifold pressure and desired exhaust temperature based on the engine speed and the amount of fuel injected in a single engine cycle.

[0108] The actual value acquisition module 402 is used to acquire the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature.

[0109] The exhaust temperature regulation module 403 is used to obtain the differential pressure based on the desired exhaust manifold pressure and the actual exhaust manifold pressure, and to control the opening of the exhaust temperature management valve based on the differential pressure, so as to regulate the exhaust temperature by adjusting the opening of the exhaust temperature management valve.

[0110] The technical solution of this invention obtains the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, and the downstream temperature of the exhaust temperature management valve. Then, based on the pressure difference between the actual exhaust manifold pressure and the desired exhaust manifold pressure, the opening of the exhaust temperature management valve is controlled. This adjusts the exhaust temperature by controlling the opening of the exhaust temperature management valve, achieving closed-loop control of exhaust temperature based on exhaust manifold pressure. Compared to traditional solutions that rely on sensors for temperature and pressure detection, this method, by calculating the actual exhaust manifold pressure, significantly improves the accuracy of exhaust temperature regulation and avoids the influence of engine operating conditions on sensor detection accuracy. Furthermore, adjusting the engine exhaust temperature based on the opening of the exhaust temperature management valve also improves the efficiency of engine exhaust temperature regulation.

[0111] Optionally, the actual value acquisition module 402 is specifically used to acquire the actual intake efficiency based on the intake manifold pressure, engine speed and desired exhaust manifold pressure; and to acquire the engine exhaust flow rate based on the actual intake efficiency, theoretical intake volume and fuel flow rate.

[0112] Optionally, the actual value acquisition module 402 is further used to acquire the upstream pressure of the exhaust temperature management valve based on the downstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the opening degree of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve.

[0113] Optionally, the actual value acquisition module 402 is further used to acquire the downstream pressure of the exhaust temperature management valve based on atmospheric pressure, engine exhaust flow rate, and downstream temperature of the exhaust temperature management valve.

[0114] Optionally, the actual value acquisition module 402 is further used to sequentially calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency; based on the current exhaust charging efficiency, it continues to sequentially calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency until the number of iterations reaches a preset iteration threshold, at which point the current exhaust manifold pressure is taken as the actual exhaust manifold pressure.

[0115] Optionally, the actual value acquisition module 402 is further used to continue to calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure and the exhaust charging efficiency in sequence based on the current exhaust charging efficiency, until the difference between the current exhaust manifold pressure and the expected exhaust manifold pressure is less than or equal to a preset difference threshold, and then the current exhaust manifold pressure is taken as the actual exhaust manifold pressure.

[0116] Optionally, the exhaust temperature adjustment module 403 is specifically used to obtain the corrected desired exhaust manifold pressure based on the temperature difference between the actual exhaust temperature and the desired exhaust temperature; and to obtain the pressure difference based on the corrected desired exhaust manifold pressure and the actual exhaust manifold pressure.

[0117] The above-described device can execute the exhaust temperature regulation method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. Technical details not described in detail in this embodiment can be found in the exhaust temperature regulation method provided in any embodiment of the present invention.

[0118] Example 5

[0119] Figure 5 A schematic diagram of an electronic device 10 that can be used to implement embodiments of the present invention is shown. The electronic device 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. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0120] like Figure 5As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0121] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0122] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as exhaust temperature regulation methods.

[0123] In some embodiments, the exhaust temperature regulation method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as a storage unit. In some embodiments, part or all of the computer program may be loaded and / or installed on a heterogeneous hardware accelerator via ROM and / or a communication unit. When the computer program is loaded into RAM and executed by a processor, one or more steps of the exhaust temperature regulation method described above may be performed. Alternatively, in other embodiments, the processor may be configured to perform the exhaust temperature regulation method by any other suitable means (e.g., by means of firmware).

[0124] Various embodiments 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-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0125] Computer programs used to implement 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, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0126] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0127] To provide user interaction, the systems and techniques described herein can be implemented on a heterogeneous hardware accelerator, which includes: 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 pointing device (e.g., a mouse or trackball) through which the user provides input to the heterogeneous hardware accelerator. Other types of devices can also be used to provide user interaction; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or haptic feedback); and input from the user can be received in any form (including sound input, voice input, or haptic input).

[0128] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0129] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0130] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0131] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An exhaust gas temperature adjustment method characterized by, include: Based on the engine speed and the amount of fuel injected in a single engine cycle, obtain the desired exhaust manifold pressure and desired exhaust temperature. The actual exhaust manifold pressure is obtained based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature. The differential pressure is obtained based on the expected exhaust manifold pressure and the actual exhaust manifold pressure, and the opening of the exhaust temperature management valve is controlled based on the differential pressure to regulate the exhaust temperature. The process of obtaining the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature specifically includes: Calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency in sequence. Based on the current exhaust charging efficiency, continue to calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency in sequence until the number of iterations reaches the preset iteration threshold. Then, the current exhaust manifold pressure is taken as the actual exhaust manifold pressure. or: After calculating the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency in sequence, it also includes: Based on the current exhaust charging efficiency, continue to calculate the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charging efficiency in sequence until the difference between the current exhaust manifold pressure and the desired exhaust manifold pressure is less than or equal to the preset difference threshold. Then, the current exhaust manifold pressure is taken as the actual exhaust manifold pressure.

2. The method of claim 1, wherein, The process of obtaining the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature specifically includes: The actual intake efficiency is obtained based on the intake manifold pressure, engine speed, and desired exhaust manifold pressure. The engine exhaust flow rate is obtained based on the actual intake efficiency, theoretical intake volume, and fuel flow rate.

3. The method of claim 1, wherein, The process of obtaining the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature specifically includes: The upstream pressure of the exhaust temperature management valve is obtained based on the downstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the opening degree of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve.

4. The method of claim 3, wherein, The process of obtaining the upstream pressure of the exhaust temperature management valve based on the downstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the opening degree of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve specifically includes: The downstream pressure of the exhaust temperature management valve is obtained based on atmospheric pressure, engine exhaust flow rate, and downstream temperature of the exhaust temperature management valve.

5. The method of claim 1, wherein, The step of obtaining the pressure difference based on the desired exhaust manifold pressure and the actual exhaust manifold pressure includes: The corrected desired exhaust manifold pressure is obtained based on the temperature difference between the actual exhaust temperature and the desired exhaust temperature. The differential pressure is obtained based on the corrected expected exhaust manifold pressure and the actual exhaust manifold pressure.

6. An exhaust temperature adjusting apparatus for executing the exhaust temperature adjusting method according to any one of claims 1 to 5, characterized by include: The desired value acquisition module is used to obtain the matching desired exhaust manifold pressure and desired exhaust temperature based on the engine speed and the amount of fuel injected in a single engine cycle. The actual value acquisition module is used to acquire the actual exhaust manifold pressure based on the upstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature. The exhaust temperature regulation module is used to obtain the differential pressure based on the desired exhaust manifold pressure and the actual exhaust manifold pressure, and to control the opening of the exhaust temperature management valve based on the differential pressure, so as to regulate the exhaust temperature by adjusting the opening of the exhaust temperature management valve.

7. An electronic device, comprising: The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the exhaust temperature regulation method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the exhaust temperature regulation method according to any one of claims 1-5.

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