A method, apparatus, device and storage medium for adjusting engine transient response

Abstract

The application provides a method, device, equipment and storage medium for adjusting engine transient response, the method comprising: determining a first oil pump demand flow value of a shovel in response to an action instruction of the shovel; determining a first hydraulic demand power value according to the first oil pump demand flow value and a current pump pressure value of the oil pump; determining a correction factor of a first hydraulic power maximum limit value according to a current intake pressure value of the engine, and correcting the first hydraulic power maximum limit value according to the correction factor to determine a second hydraulic power maximum limit value; and if the first hydraulic demand power value is greater than the second hydraulic power maximum limit value, adjusting the first oil pump demand flow value so that a second hydraulic demand power value determined based on the adjusted first pump demand flow value is not greater than the second hydraulic power maximum limit value; the method can avoid a large speed drop of the engine, improve responsiveness and maneuverability, and reduce oil consumption of the engine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, and particularly relates to a method and device for adjusting transient response of an engine, an apparatus and a storage medium. BACKGROUND

[0002] The existing method for limiting hydraulic power demand is to determine the maximum limit of hydraulic power according to the engine speed and the working mode of the excavator. However, in the transient state, due to the turbo lag effect, the engine intake volume is lower than that in the steady state under the same load. In order to meet the requirements of national regulations, the engine reduces the fuel injection amount to achieve a suitable air-fuel ratio and improve the combustion inefficiency. However, the reduction of the fuel injection amount will reduce the available power of the engine. If the maximum limit of hydraulic power remains unchanged as in the steady state, the hydraulic power demand may be higher than the available power of the engine, which may cause the engine to drop speed greatly, even trigger the anti-flameout of the engine, affect the supply of the demand flow, and further cause power interruption and poor responsiveness and controllability. Meanwhile, during the transition from the transient state to the steady state, the engine speed fluctuates frequently, and the fuel consumption also increases. SUMMARY

[0003] The present application provides a method and device for adjusting transient response of an engine, an apparatus and a storage medium, which can reduce the maximum limit of hydraulic power when the engine reduces the fuel injection amount to cause the available power of the engine to decrease, and adjust the hydraulic power demand, so that the hydraulic power demand is not greater than the maximum limit of hydraulic power, that is, the hydraulic power demand is less than the available power of the engine, thereby avoiding the engine from dropping speed greatly and improving the responsiveness and controllability.

[0004] In a first aspect, the present application provides a method for adjusting transient response of an engine, comprising:

[0005] determining a first oil pump demand flow value of an excavator in response to an action instruction of the excavator;

[0006] determining a first hydraulic power demand value according to the first oil pump demand flow value and a current pump pressure value of an oil pump, wherein the oil pump is used to provide hydraulic oil for a hydraulic system;

[0007] determining a correction factor of a first hydraulic power maximum limit according to a current intake pressure value of the engine, and correcting the first hydraulic power maximum limit according to the correction factor to determine a second hydraulic power maximum limit;

[0008] if the first hydraulic power demand value is greater than the second hydraulic power maximum limit, adjusting the first oil pump demand flow value, so that a second hydraulic power demand value determined based on the adjusted first pump demand flow value is not greater than the second hydraulic power maximum limit.

[0009] In one or more possible embodiments, the determining the correction factor of the first hydraulic power maximum limit value according to the current intake air pressure value of the engine comprises:

[0010] If the current intake air pressure of the engine is equal to the maximum intake air pressure, the correction factor of the first hydraulic power maximum limit value is determined as a preset fixed value;

[0011] If the current intake air pressure value of the engine is less than the maximum intake air pressure, a relationship curve corresponding to the action instruction and the first hydraulic power maximum limit value is selected from a plurality of preset intake air pressure and correction factor relationship curves;

[0012] The correction factor corresponding to the current intake air pressure of the engine is determined according to the selected relationship curve.

[0013] In one or more possible embodiments, the preset intake air pressure and correction factor relationship curve is established by the following method:

[0014] For any one action instruction, at least one second oil pump demand flow value corresponding to the any one action instruction is determined, wherein the at least one second oil pump demand flow value is obtained by adjusting an original oil pump demand flow value based on a third hydraulic power maximum limit value, and the third hydraulic power maximum limit value is obtained by correcting a fixed hydraulic power maximum limit value corresponding to the any one action instruction based on a preset correction factor;

[0015] For any one preset intake air pressure value, a plurality of engine speeds corresponding to the any one intake air pressure value and each second oil pump demand flow value are determined;

[0016] For any one determined engine speed, a speed drop value of the any one engine speed is determined according to the any one engine speed and a preset engine speed;

[0017] Based on the determined each speed drop value, a preset correction factor corresponding to the speed drop value meeting a preset range is selected from the preset correction factor as the correction factor corresponding to the any one preset intake air pressure value;

[0018] Each of the preset intake air pressure values and the corresponding correction factors are curve fitted to obtain the relationship curve.

[0019] In one or more possible embodiments, the preset intake air pressure and correction factor relationship curve is established by the following method:

[0020] For any one action instruction, determine at least one third oil pump demand flow value corresponding to the any one action instruction, wherein the at least one third oil pump demand flow value is obtained by adjusting an original oil pump demand flow value based on a preset hydraulic power maximum limit value; the preset hydraulic power maximum limit value is a preset value;

[0021] For a preset any one intake pressure value, using the any one intake pressure value and each third oil pump demand flow value, determine a corresponding plurality of engine speeds;

[0022] For any one engine speed determined, according to the any one engine speed and a preset engine speed, determine a speed drop value of the any one engine speed;

[0023] Based on the determined each said speed drop value, select a preset correction factor corresponding to the speed drop value satisfying the preset range from the preset correction factor as the correction factor corresponding to the any one preset intake pressure value; wherein the preset correction factor is the ratio of the preset hydraulic power maximum limit value and the fixed hydraulic power maximum limit value corresponding to the any one action instruction;

[0024] Curve fitting each said preset intake pressure value and the corresponding correction factor, to obtain the relationship curve.

[0025] In one or more possible embodiments, the selecting a preset correction factor corresponding to the speed drop value satisfying the preset range from the preset correction factor as the correction factor corresponding to the any one preset intake pressure value, comprises:

[0026] Determine each said speed drop value satisfying the preset range, select the preset correction factor corresponding to the smallest speed drop value as the correction factor corresponding to the any one intake pressure value.

[0027] In one or more possible embodiments, the determining the first oil pump demand flow of the excavator, comprises:

[0028] Determine the first oil pump demand flow of the excavator according to the product of the displacement of the oil pump and the speed of the oil pump;

[0029] If the first hydraulic demand power value is greater than the second hydraulic power maximum limit value, adjusting the first oil pump demand flow, comprises:

[0030] If the first hydraulic demand power value is greater than the second hydraulic power maximum limit value, keep the speed of the oil pump unchanged and reduce the displacement of the oil pump.

[0031] In one or more possible embodiments, the first hydraulic power maximum limit value is determined by:

[0032] According to a preset correspondence relationship between gears of the excavator, working modes and maximum hydraulic power limits, the first hydraulic power maximum limit corresponding to the current gear and the current working mode of the excavator is determined.

[0033] In a second aspect, the application provides a device for adjusting transient response of an engine, the device comprising:

[0034] An oil pump demand flow determination module configured to determine a first oil pump demand flow value of the excavator in response to an action instruction for the excavator.

[0035] A hydraulic demand power determination module configured to determine a first hydraulic demand power value according to the first oil pump demand flow value and a current pump pressure value of an oil pump configured to provide hydraulic oil for a hydraulic system.

[0036] A correction module configured to determine a correction factor of the first hydraulic power maximum limit according to a current intake pressure value of the engine, and correct the first hydraulic power maximum limit according to the correction factor to determine a second hydraulic power maximum limit.

[0037] An adjustment module configured to adjust the first oil pump demand flow value if the first hydraulic demand power value is greater than the second hydraulic power maximum limit, so that a second hydraulic demand power value determined based on the adjusted first pump demand flow value is not greater than the second hydraulic power maximum limit.

[0038] In a third aspect, the application provides a device for adjusting transient response of an engine, the device comprising:

[0039] At least one processor; and a memory communicatively connected with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of any one of the first aspect.

[0040] In a fourth aspect, the application provides a storage medium storing a computer program, the computer program being configured to enable a computer to perform the method of any one of the first aspect.

[0041] According to the method, device, equipment and storage medium for adjusting engine transient response provided in the application, when the available power of the engine is reduced due to the reduced fuel injection amount, a corresponding correction factor is determined according to the intake pressure, the maximum limit value of the hydraulic power is corrected according to the correction factor, and when the hydraulic demand power is greater than the maximum limit value of the corrected hydraulic power, the hydraulic demand power is adjusted so as to be not greater than the maximum limit value of the hydraulic power, that is, the hydraulic demand power is less than the available power of the engine, so that the engine is prevented from generating a large speed drop, and the responsiveness and maneuverability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0042] The drawings incorporated in the specification and forming a part thereof illustrate embodiments consistent with the present application and together with the description are used to explain the principles of the application, but are not to be construed as an undue limitation thereon.

[0043] Figure 1 A flow chart of a method for adjusting engine transient response according to an embodiment;

[0044] Figure 2 A method effect comparison chart according to an embodiment;

[0045] Figure 3 A device schematic diagram for adjusting engine transient response according to an embodiment;

[0046] Figure 4 A device schematic diagram for adjusting engine transient response according to an embodiment;

[0047] Figure 5 A storage medium schematic diagram according to an embodiment. DETAILED DESCRIPTION

[0048] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0049] It is to be understood that the terms "first", "second", and the like in the description and in the claims of the present disclosure and the above-described drawings are used to distinguish between similar objects, and do not necessarily have to describe a particular sequential or chronological order. It should be understood that the data thus used can be interchanged, where appropriate, so that the embodiments of the present disclosure described herein can be carried out in other sequences than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0050] In the prior related art, the maximum limit of the allowed hydraulic power is mainly determined according to the engine speed of the excavator and the working mode of the excavator, which is suitable for steady state conditions. However, in transient conditions, due to the turbo lag effect, the engine intake volume is lower than that in steady state conditions under the same load, that is, the engine intake pressure in transient conditions is lower than that in steady state conditions under the same load. At this time, the air-fuel ratio is low, the combustion is deteriorated, and the smoke is intensified. In order to meet the requirements of relevant regulations, the engine will reduce the fuel injection amount to achieve a suitable air-fuel ratio, reduce the combustion inefficiency. However, the reduction of the fuel injection amount will result in a reduction of the available power of the engine. If the maximum limit of the hydraulic power remains consistent with the steady state condition at this time, it is likely that the hydraulic demand power will be higher than the available power of the engine, which will cause the engine to have a large drop in speed, even trigger the engine anti-flameout, affect the supply of demand flow, and further cause power interruption, poor responsiveness and controllability. At the same time, during the transition from transient conditions to steady state conditions, the engine speed fluctuates frequently, and the fuel consumption also increases.

[0051] Based on the above problems, the present application provides a method, device, equipment and storage medium for adjusting engine transient response. When the engine reduces the fuel injection amount to cause the available power of the engine to decrease, the maximum limit of the hydraulic power is reduced, and the hydraulic demand power is adjusted so that the hydraulic demand power is not greater than the maximum limit of the hydraulic power, that is, the hydraulic demand power is less than the available power of the engine, thereby avoiding the engine from having a large drop in speed and improving the responsiveness and controllability.

[0052] Embodiment 1

[0053] The present application provides a method for adjusting engine transient response, as shown in Figure 1 The method comprises the following steps:

[0054] Step 101, in response to an action instruction for an excavator, determining a first oil pump demand flow value of the excavator;

[0055] In one or more possible embodiments, the first oil pump demand flow rate is determined according to an action instruction of the excavator, for example, an action of excavating, an action of unloading, an action of walking, an action of changing the angle of the excavator, etc.

[0056] In step 102, a first hydraulic demand power value is determined according to the first oil pump demand flow rate value and a current pump pressure value of the oil pump, wherein the oil pump is used to provide hydraulic oil for a hydraulic system.

[0057] In one or more possible embodiments, the first oil pump demand flow rate is determined according to an action of the excavator, and the current pump pressure value of the oil pump is determined according to a pressure sensor. The first hydraulic demand power value can be directly determined according to the formula P = p * Q, wherein P represents the hydraulic demand power value, p represents the current pump pressure value in pascal (Pa), Q represents the oil pump demand flow rate in cubic meters per second (m / s), and the oil pump is used to provide hydraulic oil for the hydraulic system. The hydraulic system transmits energy according to the hydraulic oil provided by the oil pump to enable the excavator to perform corresponding actions according to the action instruction. 3 / s), and the oil pump is used to provide hydraulic oil for the hydraulic system. The hydraulic system transmits energy according to the hydraulic oil provided by the oil pump to enable the excavator to perform corresponding actions according to the action instruction.

[0058] In step 103, a correction factor of the first hydraulic power maximum limit value is determined according to a current intake pressure value of the engine, and the first hydraulic power maximum limit value is corrected according to the correction factor to determine a second hydraulic power maximum limit value.

[0059] In one or more possible embodiments, the first hydraulic power maximum limit value can be directly determined in the case where the gear of the excavator and the working mode of the excavator are determined. Specifically, the first hydraulic power maximum limit value corresponding to the current gear and the current working mode of the excavator can be determined according to a preset corresponding relationship between the gear, the working mode, and the hydraulic power maximum limit value of the excavator. After the first hydraulic power maximum limit value and the action instruction of the excavator are determined, the correction factor corresponding to the current intake pressure of the engine can be determined from a plurality of relationship curves according to the corresponding relationship curve between the current intake pressure and the correction factor. After the correction factor is determined, the second hydraulic power maximum limit value is determined according to the product of the correction factor and the first hydraulic power maximum limit value. The second hydraulic power maximum limit value is the corrected hydraulic power maximum limit value. In the transient state, the available power of the engine decreases. The correction factor is a positive number less than or equal to 1. In order to limit the first hydraulic power maximum limit value to be less than or equal to the available power of the engine, the first hydraulic power maximum limit value needs to be multiplied by the correction factor to obtain the corrected hydraulic power maximum limit value, that is, the second hydraulic power maximum limit value, so that the second hydraulic power maximum limit value is less than the available power of the engine.

[0060] Step 104, if the first hydraulic demand power value is greater than the second hydraulic power maximum limit value, the first oil pump demand flow value is adjusted so that the second hydraulic demand power value determined based on the adjusted first pump demand flow value is not greater than the second hydraulic power maximum limit value.

[0061] In one or more possible embodiments, when it is determined that the calculated first hydraulic demand power value is greater than the second hydraulic power maximum limit value, the first hydraulic demand power value needs to be adjusted to be less than or equal to the second hydraulic power maximum limit value; the first oil pump demand flow of the excavator can be directly determined according to the product of the displacement of the oil pump and the rotating speed of the oil pump, so that the first oil pump demand flow is adjusted by reducing the displacement of the oil pump while keeping the rotating speed of the oil pump unchanged, so as to achieve the purpose of reducing the first oil pump demand flow; the first hydraulic demand power value is determined according to the product of the first oil pump demand flow value and the current pump pressure value of the oil pump, so that the first hydraulic demand power value is reduced by reducing the first oil pump demand flow value, and finally the second hydraulic demand power value determined based on the adjusted first pump demand flow value is determined to be not greater than the second hydraulic power maximum limit value; the second hydraulic power maximum limit value is less than the available power of the engine, and the second hydraulic demand power value not greater than the second hydraulic power maximum limit value means that the second hydraulic demand power value is less than the available power of the engine.

[0062] According to the method for adjusting the transient response of the engine provided in the present application, when the available power of the engine is reduced due to the reduction of the fuel injection amount, the maximum limit value of the hydraulic power is reduced, and the hydraulic demand power is adjusted so that the hydraulic demand power is not greater than the maximum limit value of the hydraulic power, that is, the hydraulic demand power is less than the available power of the engine, thereby avoiding the engine from generating a large drop in speed and improving the responsiveness and maneuverability.

[0063] In one or more possible embodiments, when the intake pressure is equal to the maximum intake pressure, the intake amount meets the requirements, so the engine does not perform smoke limitation and does not reduce the fuel injection amount, and the available power of the engine is equal to the theoretical maximum limit value of the engine. However, when the intake pressure is less than the maximum intake pressure, the engine needs to perform smoke limitation and reduce the fuel injection amount, and the available power of the engine is determined according to the following formula:

[0064]

[0065] wherein, F max is the maximum allowed fuel injection amount, mAir For the intake amount, λ0 is the excess air coefficient, and l0 is the theoretical air-fuel ratio; the excess air coefficient λ0 can represent the intake amount m Air That is, the relationship between the intake pressure and the maximum allowable injection amount F max When the excess air coefficient λ0 is constant, the smaller the intake pressure, the smaller the allowable injection amount, and the smaller the actual power of the engine, so the correction factor can be determined according to the intake pressure. The smaller the intake pressure, the smaller the correction factor, so as to limit the hydraulic power maximum limit to below the available power of the engine.

[0066] In one or more possible embodiments, the above-mentioned correction factor for determining the first hydraulic power maximum limit according to the current intake pressure value of the engine includes: if the current intake pressure of the engine is equal to the maximum value of the intake pressure, the correction factor for determining the first hydraulic power maximum limit is a preset fixed value; the maximum value of the intake pressure is a constant value after the turbocharger model is selected, and when the current intake pressure is the maximum value, that is, the constant value, the correction factor for determining the first hydraulic power maximum limit is directly determined as a preset fixed value. In this application, the preset fixed value is determined as 1. When it is determined that the current intake pressure is equal to the maximum value of the intake pressure, the correction factor for determining the first hydraulic power maximum limit is directly determined as 1. If the current intake pressure value of the engine is less than the maximum value of the intake pressure, select the relationship curve corresponding to the above action command and the first hydraulic power maximum limit from the preset multiple intake pressure and correction factor relationship curves; determine the correction factor corresponding to the current intake pressure of the engine according to the selected relationship curve; when it is determined that the current intake pressure value of the engine is less than the maximum value of the intake pressure, select the relationship curve corresponding to the above action command and the first hydraulic power maximum limit from the multiple preset intake pressure and correction factor relationship curves, and select the correction factor corresponding to the current intake pressure of the engine according to the relationship curve; for example, the first hydraulic power maximum limit includes three, A1, A2 and A3, and the action command includes two, B1 and B2. When it is determined that the first hydraulic power maximum limit is A2 and the action command is B1, it can be determined that the A2B1 relationship curve is selected from the multiple preset relationship curves, and the correction factor corresponding to the current intake pressure is determined according to the A2B1 relationship curve.

[0067] In one or more possible embodiments, the following two methods are used to establish the preset intake pressure and correction factor relationship curve:

[0068] The first kind, for any one action instruction, determine the at least one second oil pump demand flow value corresponding to the above any one action instruction, wherein the at least one second oil pump demand flow value is obtained by adjusting the original oil pump demand flow value based on the third hydraulic power maximum limit value, the third hydraulic power maximum limit value is obtained by correcting the fixed hydraulic power maximum limit value corresponding to the above any one action instruction based on the preset correction factor;For any one preset intake pressure value, using the above any one intake pressure value and each second oil pump demand flow value, determine the corresponding multiple engine speeds;For any one determined engine speed, according to the above any one engine speed and the preset engine speed, determine the drop speed value of any one engine speed;Based on the determined each above drop speed value, select the preset correction factor corresponding to the above drop speed value that meets the preset range from the preset correction factor as the correction factor corresponding to the above any one preset intake pressure value;Curve fitting is carried out for each of the above preset intake pressure value and the corresponding correction factor, and the above relationship curve is obtained.

[0069] For example, the action instruction for digging can determine an original oil pump demand flow value, and determine a hydraulic demand power value according to the original oil pump demand flow value and a preset oil pump pump pressure value. Any one of the preset intake pressure values is 80, and multiple preset correction factors are set for any one of the intake pressure values, which are 0.6, 0.7, 0.8, and 0.9, a total of four preset correction factors. The four preset correction factors correct a fixed hydraulic power maximum limit value to obtain four third hydraulic power maximum limit values, C1, C2, C3, and C4. The hydraulic demand power value determined according to the original oil pump demand flow value is compared with C1, C2, C3, and C4 respectively, and it is determined that C1, C2, and C3 are less than the hydraulic demand power value, and C4 is greater than the hydraulic demand power value. At this time, it is determined that the three third hydraulic power maximum limit values C1, C2, and C3 need to be adjusted, that is, the hydraulic demand power value needs to be adjusted below C1, C2, and C3. That is, the original oil pump demand flow value needs to be adjusted to adjust the hydraulic demand power value below C1, C2, and C3. Since the values of C1, C2, and C3 are different, the size of the adjusted original oil pump demand flow value is also different. When C1

[0070] Second, for any one action instruction, determine the at least one third oil pump demand flow value corresponding to the above any one action instruction, wherein the at least one third oil pump demand flow value is obtained by adjusting the original oil pump demand flow value based on the preset hydraulic power maximum limit value; The above-mentioned preset hydraulic power maximum limit value is a preset value; For any one preset intake pressure value, use the above-mentioned any one intake pressure value and each third oil pump demand flow value to determine the corresponding multiple engine speeds; For any one determined engine speed, determine the speed drop value of the any one engine speed according to the any one engine speed and the preset engine speed; Based on the determined each above-mentioned speed drop value, select the preset correction factor corresponding to the above-mentioned speed drop value that meets the preset range from the preset correction factor as the correction factor corresponding to the above-mentioned any one preset intake pressure value; Wherein, the above-mentioned preset correction factor is the ratio of the above-mentioned preset hydraulic power maximum limit value and the fixed hydraulic power maximum limit value corresponding to the above-mentioned any one action instruction; Curve fitting is carried out for each of the above-mentioned preset intake pressure value and the corresponding correction factor to obtain the above-mentioned relationship curve.

[0071] For example, for a digging action instruction, the original oil pump demand flow corresponding to the digging action instruction is determined, and a hydraulic demand power value is determined according to the original oil pump demand flow and a preset oil pump pressure value; and the preset hydraulic power maximum limit value is compared with the above-mentioned hydraulic demand power value, the above-mentioned preset hydraulic power maximum limit value is multiple, that is, the hydraulic demand power value is compared with the above-mentioned multiple preset hydraulic power maximum limit value, when the hydraulic demand power value is greater than the preset hydraulic power maximum limit value, the above-mentioned hydraulic demand power needs to be adjusted to be reduced below the above-mentioned preset hydraulic power maximum limit value; specifically, the hydraulic demand power value is 90, and the preset hydraulic power maximum limit value is 95, 90, 80, 70 and 60 respectively; for the preset hydraulic power maximum limit value of 95, the hydraulic demand power value does not need to be adjusted; for the preset hydraulic power maximum limit value of 90, the hydraulic demand power value also does not need to be adjusted; for the preset hydraulic power maximum limit value of 80, the hydraulic demand power value 90 needs to be adjusted to be below 80, according to the relationship between the original oil pump demand flow value and the hydraulic demand power value, it can be determined that the hydraulic demand power value can be reduced only by reducing the original oil pump demand flow value, and a third oil pump demand flow value is determined, the above-mentioned third oil pump demand flow value is the original oil pump demand flow value after adjustment; similarly, for the preset hydraulic power maximum limit value of 70 and 60, the original oil pump demand flow value also needs to be adjusted to obtain a third oil pump demand flow value; three third oil pump demand flow values are determined, for the above-mentioned three third oil pump demand flow values, the speed of three engines is obtained under the basis of a preset any intake pressure value, according to the speed of three engines and the preset engine speed, the drop speed value corresponding to the speed of three engines is determined, whether the above-mentioned three drop speed values meet the preset range is determined, if yes, the ratio of the preset hydraulic power maximum limit value corresponding to the three drop speed values to the fixed hydraulic power maximum limit value corresponding to the any action instruction is taken as a preset correction factor, any one of the above-mentioned three preset correction factors can be selected as a correction factor corresponding to any intake pressure value, or the ratio of the preset hydraulic power maximum limit value corresponding to the minimum drop speed value to the fixed hydraulic power maximum limit value corresponding to the any action instruction is taken as the correction factor corresponding to any intake pressure value; and finally, each of the above-mentioned preset intake pressure values and the corresponding correction factor are curve fitted to obtain the above-mentioned relationship curve.

[0072] According to the method for adjusting the transient response of the engine provided in the application, when the available power of the engine is reduced due to the reduced fuel injection amount, a corresponding correction factor is determined according to the intake pressure, the maximum limit value of the hydraulic power is corrected according to the correction factor, and when the hydraulic demand power is greater than the maximum limit value of the corrected hydraulic power, the hydraulic demand power is adjusted so that the hydraulic demand power is not greater than the maximum limit value of the hydraulic power, that is, the hydraulic demand power is less than the available power of the engine, the smaller the intake pressure, the smaller the correction factor, and the smaller the corrected hydraulic demand power, which can actively reduce the hydraulic demand power to below the available power of the engine in the transient state, for example, as shown in the comparison curve between the existing method and the method of the application, it can be obviously seen that the speed drop of the engine is obviously reduced, the responsiveness and maneuverability are improved, the fluctuation of the engine speed is reduced in the process of the transient state to the steady state, the transition time is shortened, the overall fuel consumption is reduced, and the work efficiency is improved. Figure 2

[0073] Embodiment 2

[0074] The application provides a device for adjusting the transient response of an engine, as shown in Figure 3 The device comprises:

[0075] An oil pump demand flow determination module 301 is configured to determine a first oil pump demand flow value of an excavator in response to an action instruction of the excavator.

[0076] A hydraulic demand power determination module 302 is configured to determine a first hydraulic demand power value according to the first oil pump demand flow value and a current pump pressure value of an oil pump, wherein the oil pump is configured to provide hydraulic oil for a hydraulic system.

[0077] A correction module 303 is configured to determine a correction factor of a first hydraulic power maximum limit value according to a current intake pressure value of an engine, and correct the first hydraulic power maximum limit value according to the correction factor to determine a second hydraulic power maximum limit value.

[0078] An adjustment module 304 is configured to adjust the first oil pump demand flow value if the first hydraulic demand power value is greater than the second hydraulic power maximum limit value, so that a second hydraulic demand power value determined based on the adjusted first pump demand flow value is not greater than the second hydraulic power maximum limit value.

[0079] Embodiment 3

[0080] ​The application provides an apparatus for adjusting engine transient response, comprising at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method for adjusting engine transient response.

[0081] As shown in Figure 4 The apparatus comprises a processor 401, a memory 402, a communication interface 403 and a bus 404. The processor 401, the memory 402 and the communication interface 403 are connected with each other through the bus 404.

[0082] The processor 401 is configured to read instructions in the memory 402 and execute the instructions to enable the at least one processor to perform the method for adjusting engine transient response provided by the above embodiments.

[0083] The memory 402 is configured to store various instructions and programs of the method for adjusting engine transient response provided by the above embodiments.

[0084] The bus 404 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 4 Only one thick line is used in the figure, but it does not mean that there is only one bus or only one type of bus.

[0085] The processor 401 can be a central processing unit (CPU), a network processor (NP), a graphic processing unit (GPU), or any combination of CPU, NP, and GPU. It can also be a hardware chip. The hardware chip can be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0086] Embodiment 4

[0087] In addition, the present application also provides a storage medium, such as a computer storage medium, a computer program, and a computer program product. Figure 5 As shown in the figure, the computer storage medium stores a computer program, and the computer program is used to make the computer execute any one of the methods in the above embodiments.

[0088] The memory can include a readable medium in the form of a volatile memory, such as a random access memory (RAM) 501 and / or a cache memory 502, and can further include a read-only memory (ROM) 503.

[0089] The memory can further include a program / utility 505 having a set of program modules 504, including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination thereof can include implementation of a network environment.

[0090] Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROMs, optical storage, etc.) containing computer usable program code.

[0091] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks. Figure 1 one or more flow or blocks.

[0092] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flow or blocks. Figure 1 one or more flow or blocks.

[0093] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks. Figure 1 one or more flow or blocks.

[0094] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method of adjusting engine transient response, characterized by, Comprising: in response to an action instruction for the excavator, determining a first oil pump demand flow value of the excavator; determining a first hydraulic demand power value according to the first oil pump demand flow value and a current pump pressure value of the oil pump, wherein the oil pump is used to provide hydraulic oil for a hydraulic system; determining a second hydraulic power maximum limit value by determining a correction factor of the first hydraulic power maximum limit value according to a current intake air pressure value of the engine and correcting the first hydraulic power maximum limit value according to the correction factor; wherein the correction factor of the first hydraulic power maximum limit value according to the current intake air pressure value of the engine comprises: if the current intake air pressure of the engine is equal to a maximum intake air pressure, determining the correction factor of the first hydraulic power maximum limit value as a preset fixed value; if the current intake air pressure value of the engine is less than the maximum intake air pressure, selecting a relationship curve corresponding to the action instruction and the first hydraulic power maximum limit value from a plurality of preset intake air pressure and correction factor relationship curves; and determining the correction factor corresponding to the current intake air pressure of the engine according to the selected relationship curve; the preset intake air pressure and correction factor corresponding relationship curve is established by the following way: For any one action instruction, determine at least one second oil pump demand flow value corresponding to the any one action instruction, wherein the at least one second oil pump demand flow value is obtained by adjusting an original oil pump demand flow value based on a third hydraulic power maximum limit value, and the third hydraulic power maximum limit value is obtained by correcting a fixed hydraulic power maximum limit value corresponding to the any one action instruction based on a preset correction factor; for any one preset intake pressure value, determine a plurality of engine speeds corresponding to the any one intake pressure value and each second oil pump demand flow value; for any one determined engine speed, determine a speed drop value of the any one engine speed according to the any one engine speed and a preset engine speed; based on each determined speed drop value, select a preset correction factor corresponding to the speed drop value meeting a preset range from preset correction factors as a correction factor corresponding to the any one preset intake pressure value; perform curve fitting on each preset intake pressure value and the corresponding correction factor to obtain the relationship curve; or, for any one action instruction, determine at least one third oil pump demand flow value corresponding to the any one action instruction, wherein the at least one third oil pump demand flow value is obtained by adjusting an original oil pump demand flow value based on a preset hydraulic power maximum limit value; the preset hydraulic power maximum limit value is a preset value; for any one preset intake pressure value, determine a plurality of engine speeds corresponding to the any one intake pressure value and each third oil pump demand flow value; for any one determined engine speed, determine a speed drop value of the any one engine speed according to the any one engine speed and a preset engine speed; based on each determined speed drop value, select a preset correction factor corresponding to the speed drop value meeting a preset range from preset correction factors as a correction factor corresponding to the any one preset intake pressure value; wherein the preset correction factor is a ratio of the preset hydraulic power maximum limit value to a fixed hydraulic power maximum limit value corresponding to the any one action instruction; perform curve fitting on each preset intake pressure value and the corresponding correction factor to obtain the relationship curve. If the first hydraulic demand power value is greater than the second hydraulic power maximum limit value, adjust the first oil pump demand flow value, so that the second hydraulic demand power value determined based on the adjusted first pump demand flow value is not greater than the second hydraulic power maximum limit value.

2. The method of claim 1, wherein, The selecting, from preset correction factors, a preset correction factor corresponding to the speed drop value meeting a preset range as a correction factor corresponding to the any one preset intake pressure value includes: Determining each speed drop value meeting a preset range, and selecting a preset correction factor corresponding to the smallest speed drop value as a correction factor corresponding to the any one intake pressure value.

3. The method of claim 1, wherein, The determining the first oil pump demand flow of the excavator includes: Determining the first oil pump demand flow of the excavator according to the product of the displacement of the oil pump and the speed of the oil pump; If the first hydraulic demand power value is greater than the second hydraulic power maximum limit value, adjusting the first oil pump demand flow comprises: If the first hydraulic demand power value is greater than the second hydraulic power maximum limit value, keeping the rotation speed of the oil pump unchanged and reducing the displacement of the oil pump.

4. The method according to any one of claims 1 to 3, characterized in that, The first hydraulic power maximum limit value is determined by the following method: According to a preset correspondence between the gear, the working mode and the hydraulic power maximum limit value of the excavator, the first hydraulic power maximum limit value corresponding to the current gear and the current working mode of the excavator is determined.

5. An apparatus for adjusting engine transient response, characterized by, The device comprises: An oil pump demand flow determination module for determining the first oil pump demand flow value of the excavator in response to an action instruction for the excavator; A hydraulic demand power determination module for determining a first hydraulic demand power value according to the first oil pump demand flow value and the current pump pressure value of the oil pump, wherein the oil pump is used to provide hydraulic oil for the hydraulic system; A correction module for determining a correction factor of the first hydraulic power maximum limit value according to the current intake air pressure value of the engine and correcting the first hydraulic power maximum limit value according to the correction factor to determine a second hydraulic power maximum limit value, wherein the correction factor of the first hydraulic power maximum limit value according to the current intake air pressure value of the engine comprises: if the current intake air pressure of the engine is equal to the maximum intake air pressure, determining the correction factor of the first hydraulic power maximum limit value as a preset fixed value; if the current intake air pressure value of the engine is less than the maximum intake air pressure, selecting a relationship curve corresponding to the action instruction and the first hydraulic power maximum limit value from a plurality of preset intake air pressure and correction factor relationship curves; and determining the correction factor corresponding to the current intake air pressure of the engine according to the selected relationship curve; The preset intake air pressure and correction factor relationship curve is established by the following method: For any one action instruction, determine at least one second oil pump demand flow value corresponding to the any one action instruction, wherein the at least one second oil pump demand flow value is obtained by adjusting an original oil pump demand flow value based on a third hydraulic power maximum limit value, and the third hydraulic power maximum limit value is obtained by correcting a fixed hydraulic power maximum limit value corresponding to the any one action instruction based on a preset correction factor; for any one preset intake pressure value, determine a plurality of engine speeds corresponding to the any one intake pressure value and each second oil pump demand flow value; for any one determined engine speed, determine a speed drop value of the any one engine speed according to the any one engine speed and a preset engine speed; based on each determined speed drop value, select a preset correction factor corresponding to the speed drop value meeting a preset range from preset correction factors, as a correction factor corresponding to the any one preset intake pressure value; perform curve fitting on each preset intake pressure value and the corresponding correction factor to obtain the relationship curve; or, for any one action instruction, determine at least one third oil pump demand flow value corresponding to the any one action instruction, wherein the at least one third oil pump demand flow value is obtained by adjusting an original oil pump demand flow value based on a preset hydraulic power maximum limit value; the preset hydraulic power maximum limit value is a preset value; for any one preset intake pressure value, determine a plurality of engine speeds corresponding to the any one intake pressure value and each third oil pump demand flow value; for any one determined engine speed, determine a speed drop value of the any one engine speed according to the any one engine speed and a preset engine speed; based on each determined speed drop value, select a preset correction factor corresponding to the speed drop value meeting a preset range from preset correction factors, as a correction factor corresponding to the any one preset intake pressure value; wherein the preset correction factor is a ratio of the preset hydraulic power maximum limit value to a fixed hydraulic power maximum limit value corresponding to the any one action instruction; perform curve fitting on each preset intake pressure value and the corresponding correction factor to obtain the relationship curve. The adjustment module is configured to, if the first hydraulic demand power value is greater than the second hydraulic power maximum limit value, adjust the first oil pump demand flow value, so that a second hydraulic demand power value determined based on the adjusted first pump demand flow value is not greater than the second hydraulic power maximum limit value.

6. An apparatus for adjusting engine transient response, characterized by, The device includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-4.

7. A storage medium, characterized by The storage medium stores a computer program for causing a computer to perform the method of any one of claims 1-4.

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