Turbine power determination method and related apparatus

Abstract

The application discloses a turbine power determination method and related device, time average pressure data collected by a pressure sensor arranged in an exhaust pipe can be obtained; exhaust pulse pressure data corresponding to the time average pressure can be calculated according to the time average pressure and a pre-set pulse pressure calculation model; and transient turbine power of a turbine can be calculated according to the exhaust pulse pressure data and a pre-set transient power calculation model. As can be seen, the application can obtain corresponding exhaust pulse pressure data based on time average pressure data, and then accurately calculate transient turbine power at each moment based on the exhaust pulse pressure data, so that the influence of exhaust pulse pressure waves on turbine power is accurately considered, and thus the calculation result is relatively accurate and reliable.

Description

Technical Field

[0001] This invention relates to the field of engines, and in particular to a method and apparatus for determining turbine power. Background Technology

[0002] A turbocharger uses the energy of exhaust gas from the engine to drive a turbine to rotate. The turbine then drives a coaxial compressor to rotate, compressing the air to increase the intake volume. The exhaust gas in the exhaust pipe does work through the turbine and finally flows into the aftertreatment system. The pulse pressure in the exhaust pipe has a significant impact on the turbine expansion ratio, which in turn affects the turbine's power calculation. Currently, there is no accurate method for calculating the turbine's power under pulse pressure. Summary of the Invention

[0003] In view of the above problems, the present invention provides a turbine power determination method and related apparatus to overcome or at least partially solve the above problems.

[0004] Firstly, a method for determining turbine power includes:

[0005] Obtain time-averaged pressure data from a pressure sensor installed inside the exhaust pipe;

[0006] Based on the time-averaged pressure and the pre-set pulse pressure calculation model, the exhaust pulse pressure data corresponding to the time-averaged pressure is calculated.

[0007] The transient turbine power is calculated based on the exhaust pulse pressure data and the pre-set transient power calculation model.

[0008] Optionally, in some optional embodiments, the step of calculating the transient turbine power of the turbine based on the exhaust pulse pressure data and a pre-set transient power calculation model includes:

[0009] Select the instantaneous exhaust pressure value corresponding to the first moment from the exhaust pulse pressure data;

[0010] The instantaneous expansion ratio of the turbine at the first moment is obtained based on the instantaneous exhaust pressure value;

[0011] Based on the expansion ratio and the corresponding turbocharger speed, the transient turbine power of the engine at the first moment is calculated.

[0012] Optionally, in some alternative embodiments, determining the turbine's instantaneous expansion ratio at the first moment based on the instantaneous exhaust pressure value includes:

[0013] The ratio of the instantaneous exhaust pressure to the turbine back pressure is calculated as the expansion ratio, where the turbine back pressure is the turbine outlet pressure at the first moment.

[0014] Optionally, in some optional embodiments, the step of calculating the exhaust pulse pressure data corresponding to the time-averaged pressure based on the time-averaged pressure and a pre-set pulse pressure calculation model includes:

[0015] Based on the time-averaged pressure and the preset calibration value in the pulse pressure calculation model, the corresponding pulse pressure peak value and pulse pressure trough value are determined.

[0016] The exhaust pulse pressure data is obtained based on the peak value and trough value of the pulse pressure wave, wherein the exhaust pulse pressure data is a sine function curve.

[0017] In a second aspect, a turbine power determination device includes: a pressure data acquisition unit, a pulse data calculation unit, and a turbine power calculation unit;

[0018] The pressure data acquisition unit is used to acquire time-averaged pressure data collected by a pressure sensor installed in the exhaust pipe.

[0019] The pulse data calculation unit is used to calculate the exhaust pulse pressure data corresponding to the time average pressure based on the time average pressure and a pre-set pulse pressure calculation model.

[0020] The turbine power calculation unit is used to calculate the transient turbine power of the turbine based on the exhaust pulse pressure data and a pre-set transient power calculation model.

[0021] Optionally, in some alternative embodiments, the turbine power calculation unit includes: a pressure selection subunit, an expansion ratio calculation subunit, and a power calculation subunit;

[0022] The pressure selection subunit is used to select the instantaneous exhaust pressure value corresponding to the first moment from the exhaust pulse pressure data;

[0023] The expansion ratio calculation subunit is used to obtain the instantaneous expansion ratio of the turbine at the first moment based on the instantaneous exhaust pressure value;

[0024] The power calculation subunit is used to calculate the transient turbine power of the engine at the first moment based on the expansion ratio and the corresponding turbocharger speed.

[0025] Optionally, in some alternative embodiments, the expansion ratio calculation subunit includes: a ratio calculation subunit;

[0026] The ratio calculation subunit is used to calculate the ratio of the instantaneous exhaust pressure value to the turbine afterpressure as the expansion ratio, wherein the turbine afterpressure is the turbine outlet pressure at the first moment.

[0027] Optionally, in some alternative embodiments, the pulse data calculation unit includes: a waveform data determination subunit and a pulse data determination subunit;

[0028] The waveform data determination subunit is used to determine the corresponding pulse pressure peak value and pulse pressure trough value based on the time-averaged pressure and the preset calibration value in the pulse pressure calculation model.

[0029] The pulse data determination subunit is used to obtain the exhaust pulse pressure data based on the peak value and trough value of the pulse pressure wave, wherein the exhaust pulse pressure data is a sine function curve.

[0030] Thirdly, a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the turbine power determination method described in any of the preceding claims.

[0031] Fourthly, an electronic device includes at least one processor, and at least one memory and bus connected to the processor; wherein the processor and the memory communicate with each other via the bus; the processor is used to call program instructions in the memory to execute the turbine power determination method described in any of the preceding claims.

[0032] By employing the above technical solution, the present invention provides a turbine power determination method and related apparatus, which can obtain time-averaged pressure data collected by a pressure sensor installed in the exhaust pipe; calculate exhaust pulse pressure data corresponding to the time-averaged pressure based on the time-averaged pressure and a pre-set pulse pressure calculation model; and calculate the transient turbine power based on the exhaust pulse pressure data and a pre-set transient power calculation model. Therefore, it can be seen that the present invention can obtain corresponding exhaust pulse pressure data based on time-averaged pressure data, and then accurately calculate the transient turbine power at each moment based on the exhaust pulse pressure data, resulting in relatively accurate and reliable calculation results.

[0033] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 A flowchart of the first turbine power determination method provided by the present invention is shown;

[0036] Figure 2 A flowchart of the second turbine power determination method provided by the present invention is shown;

[0037] Figure 3 This invention provides a data schematic diagram.

[0038] Figure 4 A flowchart of the third turbine power determination method provided by the present invention is shown;

[0039] Figure 5 A flowchart of the fourth turbine power determination method provided by the present invention is shown;

[0040] Figure 6 A schematic diagram of the structure of the first turbine power determination device provided by the present invention is shown;

[0041] Figure 7 A schematic diagram of the structure of the second turbine power determination device provided by the present invention is shown;

[0042] Figure 8 A schematic diagram of the structure of the third turbine power determination device provided by the present invention is shown;

[0043] Figure 9 A schematic diagram of the structure of an electronic device provided by the present invention is shown. Detailed Implementation

[0044] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0045] like Figure 1 The present invention provides a method for determining turbine power, including: S100, S200 and S300;

[0046] S100: Obtain time-averaged pressure data collected by a pressure sensor installed in the exhaust pipe;

[0047] Optionally, the exhaust gas in the exhaust pipe performs work through the turbine and finally flows into the aftertreatment system. The pulse pressure in the exhaust pipe has a significant impact on the opening of the wastegate. Therefore, in order to accurately calculate the turbine power, this invention can install a corresponding pressure sensor inside the exhaust pipe to collect the corresponding exhaust gas pressure.

[0048] It should be noted that the pressure on the exhaust side of a multi-cylinder diesel engine repeats in a regular pressure pulsation pattern as the exhaust valve opens and closes (referred to as exhaust pulse pressure). However, the pressure sensor installed in the exhaust pipe typically measures time-averaged pressure data (referred to as exhaust pipe pressure), rather than pulse-like data.

[0049] S200. Based on the time-averaged pressure and the pre-set pulse pressure calculation model, calculate the exhaust pulse pressure data corresponding to the time-averaged pressure.

[0050] Optionally, the present invention can pre-establish the correspondence between time-averaged pressure, exhaust pulse pressure data, and other calibrated quantities to form the pulse pressure calculation model. When needed, the corresponding exhaust pulse pressure data can be obtained based on the time-averaged pressure.

[0051] For example, such as Figure 2 As shown, in some optional embodiments, S200 includes: S210 and S220;

[0052] S210. Based on the time-averaged pressure and the preset calibration value in the pulse pressure calculation model, determine the corresponding pulse pressure peak value and pulse pressure trough value.

[0053] Optionally, this invention requires obtaining exhaust pulse pressure data based on time-averaged pressure. However, time-averaged pressure is a flat, straight line on the time axis, while exhaust pulse pressure data is a fluctuating sinusoidal curve on the time axis. Therefore, this invention needs to determine the corresponding peak and trough values ​​of the pulse pressure waves.

[0054] Optionally, this invention can calibrate the pulse peak coefficient and pulse trough coefficient in the pulse pressure calculation model. These two coefficients can be calibrated into two images, with the X-axis of each image representing the engine speed and the engine fuel injection quantity, respectively. That is, the engine speed and the engine fuel injection quantity can be understood as preset calibration values ​​in the pulse pressure calculation model.

[0055] Optionally, in addition to these parameters, the calibration parameters can also include the exhaust valve opening duration (which can be set to a constant) and the number of engine cylinders (which determines the number of pulse repetitions). The corresponding firing interval can be obtained by using the exhaust valve opening duration and the number of engine cylinders.

[0056] S220. Obtain the exhaust pulse pressure data based on the peak value and trough value of the pulse pressure wave;

[0057] The exhaust pulse pressure data is a sine function curve.

[0058] Please see details. Figure 3 The data diagram shown illustrates the time-averaged pressure as described in this invention. Figure 3 The exhaust pressure shown in the figure, and the resulting exhaust pulse pressure data are as follows: Figure 3 The exhaust pulse pressure is shown in the figure.

[0059] S300. Based on the exhaust pulse pressure data and the pre-set transient power calculation model, the transient turbine power of the turbine is calculated.

[0060] Optionally, the transient power calculation model mentioned in this invention can be understood as a calculation formula. The exhaust pulse pressure data is used as the input parameter, and the corresponding transient turbine power can be calculated through the transient power calculation model.

[0061] It should be noted that the transient turbine power mentioned in this invention can be understood as the instantaneous power of the turbine, that is, the turbine power at any instant. This invention does not limit this.

[0062] Optional, such as Figure 4 As shown, in some optional embodiments, S300 includes: S310, S320 and S330;

[0063] S310. Select the instantaneous exhaust pressure value corresponding to the first moment from the exhaust pulse pressure data;

[0064] Optional, combined Figure 3 The data shown is an exhaust pulse pressure curve on the time axis, and the data may differ at different times. Therefore, this invention allows for the selection of data at a specific moment, i.e., the instantaneous exhaust pressure value, when it is necessary to calculate the transient turbine power at a certain moment.

[0065] S320. The instantaneous expansion ratio of the turbine at the first moment is obtained based on the instantaneous exhaust pressure value;

[0066] Optionally, the expansion ratio is a well-known technical concept in the art, and this invention will not describe it in detail. Please refer to the relevant descriptions in the art for details.

[0067] Optionally, the present invention does not impose specific limitations on the process of calculating the expansion ratio. For example, as Figure 5 As shown, in some optional embodiments, S320 includes: S321;

[0068] S321. Calculate the ratio of the instantaneous exhaust pressure value to the turbine after pressure as the expansion ratio;

[0069] Wherein, the turbine back pressure is the turbine outlet pressure at the first moment.

[0070] Optionally, the turbine back pressure can be obtained by sampling, and the present invention does not limit this.

[0071] S330. Based on the expansion ratio and the corresponding turbocharger speed, the transient turbine power of the engine at the first moment is calculated.

[0072] Optionally, the turbocharger speed can be obtained by consulting a MAP chart or by data acquisition; this invention does not impose any limitations on this.

[0073] It should be noted that, in calculating transient turbine power, this invention can also use parameters such as exhaust flow rate and exhaust temperature. Please refer to the following formula for details:

[0074] Power_tur=effi×Cp×M_exh×T3×(1-(1÷ER) (r÷(r-1)) ), where Powr_tur is the...

[0075] The transient turbine power is given by: effi, turbine efficiency, Cp, is the isobaric specific heat calculated from the instantaneous exhaust pressure and temperature, M_exh, exhaust flow rate, T3, exhaust temperature, ER, instantaneous expansion ratio, and r, exhaust gas specific heat ratio.

[0076] like Figure 6 As shown, the present invention provides a turbine power determination device, including: a pressure data acquisition unit 100, a pulse data calculation unit 200 and a turbine power calculation unit 300;

[0077] The pressure data acquisition unit 100 is used to acquire time-averaged pressure data collected by a pressure sensor installed in the exhaust pipe.

[0078] The pulse data calculation unit 200 is used to calculate the exhaust pulse pressure data corresponding to the time average pressure based on the time average pressure and a pre-set pulse pressure calculation model.

[0079] The turbine power calculation unit 300 is used to calculate the transient turbine power of the turbine based on the exhaust pulse pressure data and a pre-set transient power calculation model.

[0080] Optional, such as Figure 7As shown, in some optional embodiments, the turbine power calculation unit 300 includes: a pressure selection subunit 310, an expansion ratio calculation subunit 320, and a power calculation subunit 330;

[0081] The pressure selection subunit 310 is used to select the instantaneous exhaust pressure value corresponding to the first moment from the exhaust pulse pressure data;

[0082] The expansion ratio calculation subunit 320 is used to obtain the instantaneous expansion ratio of the turbine at the first moment based on the instantaneous exhaust pressure value;

[0083] The power calculation subunit 330 is used to calculate the transient turbine power of the engine at the first moment based on the expansion ratio and the corresponding turbocharger speed.

[0084] Optionally, in some alternative embodiments, the expansion ratio calculation subunit 320 includes: a ratio calculation subunit;

[0085] The ratio calculation subunit is used to calculate the ratio of the instantaneous exhaust pressure value to the turbine afterpressure as the expansion ratio, wherein the turbine afterpressure is the turbine outlet pressure at the first moment.

[0086] Optional, such as Figure 8 As shown, in some optional embodiments, the pulse data calculation unit 200 includes: a waveform data determination subunit 210 and a pulse data determination subunit 220;

[0087] The waveform data determination subunit 210 is used to determine the corresponding pulse pressure peak value and pulse pressure trough value based on the time-averaged pressure and the preset calibration value in the pulse pressure calculation model.

[0088] The pulse data determination subunit 220 is used to obtain the exhaust pulse pressure data based on the peak value and trough value of the pulse pressure wave, wherein the exhaust pulse pressure data is a sine function curve.

[0089] The present invention provides a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the turbine power determination method described in any of the preceding claims.

[0090] like Figure 9As shown, the present invention provides an electronic device 70, which includes at least one processor 701, at least one memory 702 and a bus 703 connected to the processor 701; wherein the processor 701 and the memory 702 communicate with each other through the bus 703; the processor 701 is used to call program instructions in the memory 702 to execute the turbine power determination method described above.

[0091] In this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0093] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined in this invention may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A method for determining turbine power, characterized in that, include: Obtain time-averaged pressure data from a pressure sensor installed inside the exhaust pipe; Based on the time-averaged pressure and a pre-set pulse pressure calculation model, exhaust pulse pressure data corresponding to the time-averaged pressure is calculated, including: determining the corresponding pulse pressure peak value and pulse pressure trough value based on the time-averaged pressure and a pre-set calibration value in the pulse pressure calculation model; obtaining the exhaust pulse pressure data based on the pulse pressure peak value and pulse pressure trough value, wherein the exhaust pulse pressure data is a sine function curve; The transient turbine power of the turbine is calculated based on the exhaust pulse pressure data and a pre-set transient power calculation model, including: selecting the instantaneous exhaust pressure value corresponding to the first moment from the exhaust pulse pressure data; obtaining the instantaneous expansion ratio of the turbine at the first moment based on the instantaneous exhaust pressure value; and calculating the transient turbine power of the engine at the first moment based on the expansion ratio and the corresponding turbocharger speed.

2. The method according to claim 1, characterized in that, The step of obtaining the turbine's instantaneous expansion ratio at the first moment based on the instantaneous exhaust pressure value includes: The ratio of the instantaneous exhaust pressure to the turbine back pressure is calculated as the expansion ratio, where the turbine back pressure is the turbine outlet pressure at the first moment.

3. A turbine power determining device, characterized in that, include: Pressure data acquisition unit, pulse data calculation unit, and turbine power calculation unit; The pressure data acquisition unit is used to acquire time-averaged pressure data collected by a pressure sensor installed in the exhaust pipe. The pulse data calculation unit is used to calculate the exhaust pulse pressure data corresponding to the time average pressure based on the time average pressure and a pre-set pulse pressure calculation model. The turbine power calculation unit is used to calculate the transient turbine power of the turbine based on the exhaust pulse pressure data and the pre-set transient power calculation model. The turbine power calculation unit includes: a pressure selection subunit, an expansion ratio calculation subunit, and a power calculation subunit; The pressure selection subunit is used to select the instantaneous exhaust pressure value corresponding to the first moment from the exhaust pulse pressure data; The expansion ratio calculation subunit is used to obtain the instantaneous expansion ratio of the turbine at the first moment based on the instantaneous exhaust pressure value; The power calculation subunit is used to calculate the transient turbine power of the engine at the first moment based on the expansion ratio and the corresponding turbocharger speed. The pulse data calculation unit includes: a waveform data determination subunit and a pulse data determination subunit; The waveform data determination subunit is used to determine the corresponding pulse pressure peak value and pulse pressure trough value based on the time-averaged pressure and the preset calibration value in the pulse pressure calculation model. The pulse data determination subunit is used to obtain the exhaust pulse pressure data based on the peak value and trough value of the pulse pressure wave, wherein the exhaust pulse pressure data is a sine function curve.

4. The apparatus according to claim 3, characterized in that, The expansion ratio calculation subunit includes: a ratio calculation subunit; The ratio calculation subunit is used to calculate the ratio of the instantaneous exhaust pressure value to the turbine afterpressure as the expansion ratio, wherein the turbine afterpressure is the turbine outlet pressure at the first moment.

5. A computer-readable storage medium having a program stored thereon, characterized in that, When the program is executed by the processor, it implements the turbine power determination method as described in any one of claims 1 to 2.

6. An electronic device, characterized in that, The electronic device includes at least one processor, and at least one memory and a bus connected to the processor; wherein the processor and the memory communicate with each other through the bus; the processor is used to call program instructions in the memory to execute the turbine power determination method as described in any one of claims 1 to 2.

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