CN112012840B - Pressure release valve state evaluation control method and device and electronic equipment - Google Patents
Pressure release valve state evaluation control method and device and electronic equipment Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The embodiment of the invention discloses a method and a device for evaluating and controlling the state of a pressure release valve and electronic equipment, wherein the method comprises the following steps: acquiring a rail pressure change gradient in a rail pipe in an engine common rail system; inputting the rail pressure change gradient in the rail pipe to a rail pressure state evaluation functional state machine to obtain a rail pressure state evaluation value; inputting the rail pressure state evaluation value into a pressure release valve state evaluation state machine to obtain the current opening times and the current accumulated opening time of the pressure release valve; and alarming when the current opening times of the pressure relief valve is larger than the upper limit of the opening times and/or the current accumulated opening time of the pressure relief valve is larger than the upper limit of the accumulated opening time. The invention can accurately and effectively calculate the opening and closing times and the accumulated opening time of the pressure relief valve, and send out fault alarm information to remind a driver to replace the pressure relief valve when the opening and closing times and the accumulated opening time exceed a certain limit value, thereby ensuring the safe operation of the vehicle.
Description
Technical Field
The embodiment of the invention relates to the field of engines, in particular to a method and a device for evaluating and controlling the state of a pressure release valve in an engine common rail fuel system and electronic equipment.
Background
Along with the development of the high-pressure common rail system of the engine, the injection pressure of the common rail system is higher and higher to meet the requirements of higher environmental protection, energy conservation and emission reduction, and the pressure born by the rail pipe of the common rail fuel system is correspondingly increased. Under certain conditions, it may happen that the pressure in the rail exceeds the system safety limit, thereby causing damage to components of the fuel system and affecting the reliability and stability of the operation of the vehicle. Therefore, the common rail pipe is internally provided with the pressure relief valve (Pressure Release Valve, PRV) which has the function of timely opening the pressure relief when the condition of overrun of the internal pressure of the rail pipe occurs, so as to prevent the damage to the engine caused by the overhigh rail pressure.
The problems of open circuit, oil return channel blockage, rail pressure sensor faults and the like of a fuel metering valve on a high-pressure oil pump in a fuel system can cause the pressure in a common rail pipe to rise sharply, the pressure limit of the pressure relief valve is exceeded, the pressure in the rail pipe is reduced after the pressure relief valve is opened for pressure relief, the pressure relief valve is reset under the action of a spring, the pressure in the rail pipe is re-established, after the pressure exceeds the limit value again, the pressure relief valve is re-opened again, and the circulation is repeated, if the pressure relief valve is opened too many times or is opened for a long time, the functions of the pressure relief valve are seriously influenced, the fatigue damage of a spring in the pressure relief valve is caused, the problem that the pressure relief valve cannot be reset occurs, and the normal operation of the fuel system is influenced. If the vehicle cannot be replaced in time, the vehicle cannot normally run.
Disclosure of Invention
The embodiment of the invention aims to provide a method, a device and electronic equipment for evaluating and controlling the state of a pressure relief valve, which are used for solving the problem that the state of the pressure relief valve of an engine common rail fuel system is difficult to accurately monitor, and the problem that the normal operation of a vehicle is not realized due to the fact that the fatigue damage of a spring in the pressure relief valve cannot be timely alarmed.
In order to achieve the above purpose, the embodiment of the present invention mainly provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides a method for controlling state evaluation of a pressure release valve, including: acquiring a rail pressure change gradient in a rail pipe in an engine common rail system; inputting the rail pressure change gradient in the rail pipe to a rail pressure state evaluation functional state machine, so that the rail pressure state evaluation functional state machine obtains rail pressure state evaluation values according to the rail pressure change gradient in the rail pipe and rail pressure change evaluation parameters, wherein the rail pressure state evaluation values comprise six different rail pressure states; inputting the rail pressure state evaluation value into a pressure release valve state evaluation state machine, so that the pressure release valve state evaluation state machine obtains the current opening times and the current accumulated opening time of the pressure release valve according to the rail pressure state evaluation value, the engine speed, the rail pressure control state, the pressure release valve operation setting parameters, the historical accumulated opening times and the historical accumulated opening time of the pressure release valve; and alarming when the current opening times of the pressure relief valve is larger than the upper limit of the opening times and/or the current accumulated opening time of the pressure relief valve is larger than the upper limit of the accumulated opening time.
According to one embodiment of the invention, the rail pressure change evaluation parameter includes a rail pressure sensor actual rail pressure value, an average rail pressure substitution value, rail pressure sensor fault information, a first order rail pressure gradient set point, a second order rail pressure gradient set point, a waiting time set point before calculating an average rail pressure after a relief valve is opened, an average rail pressure time set point after calculating the relief valve is opened, a rail pressure deviation range set point, an engine state, and a relief valve state value.
According to one embodiment of the invention, the operation setting parameters of the pressure relief valve comprise a minimum engine speed setting value for opening the pressure relief valve after the engine is started, a safety detection waiting time setting value for closing the pressure relief valve after the engine is started, a maximum engine speed setting value for closing the pressure relief valve, a pressure wave shock impact time setting value after the pressure relief valve is forcedly opened, a waiting time setting value for reestablishing the pressure relief valve after the pressure relief valve is forcedly opened and a pressure wave shock impact minimum engine speed setting value.
According to one embodiment of the present invention, further comprising: and outputting a rail pressure average value after the pressure release valve is opened through the rail pressure state evaluation function state machine.
In a second aspect, an embodiment of the present invention further provides a pressure release valve state evaluation control device, including: the acquisition module is used for acquiring the rail pressure change gradient in the rail pipe in the common rail system of the engine; an alarm module; the control processing module is used for inputting the rail pressure change gradient in the rail pipe to a rail pressure state evaluation function state machine so that the rail pressure state evaluation function state machine obtains a rail pressure state evaluation value according to the rail pressure change gradient in the rail pipe and rail pressure change evaluation parameters, wherein the rail pressure state evaluation value comprises six different rail pressure states; the control processing module is also used for inputting the rail pressure state evaluation value into a pressure relief valve state evaluation state machine so that the pressure relief valve state evaluation state machine obtains the current opening times and the current accumulated opening time of the pressure relief valve according to the rail pressure state evaluation value, the engine speed, the rail pressure control state, the pressure relief valve operation setting parameters, the historical accumulated opening times and the historical accumulated opening time of the pressure relief valve; the control processing module is also used for alarming through the alarm module when the current opening times of the pressure relief valve is larger than the upper limit of the opening times and/or the current accumulated opening time of the pressure relief valve is larger than the upper limit of the accumulated opening time.
According to one embodiment of the invention, the rail pressure change evaluation parameter includes a rail pressure sensor actual rail pressure value, an average rail pressure substitution value, rail pressure sensor fault information, a first order rail pressure gradient set point, a second order rail pressure gradient set point, a waiting time set point before calculating an average rail pressure after a relief valve is opened, an average rail pressure time set point after calculating the relief valve is opened, a rail pressure deviation range set point, an engine state, and a relief valve state value.
According to one embodiment of the invention, the operation setting parameters of the pressure relief valve comprise a minimum engine speed setting value for opening the pressure relief valve after the engine is started, a safety detection waiting time setting value for closing the pressure relief valve after the engine is started, a maximum engine speed setting value for closing the pressure relief valve, a pressure wave shock impact time setting value after the pressure relief valve is forcedly opened, a waiting time setting value for reestablishing the pressure relief valve after the pressure relief valve is forcedly opened and a pressure wave shock impact minimum engine speed setting value.
According to one embodiment of the invention, the control processing module is further configured to output a rail pressure average value after the pressure relief valve is opened through the rail pressure state evaluation function state machine.
In a third aspect, an embodiment of the present invention further provides an electronic device, including: at least one processor and at least one memory; the memory is used for storing one or more program instructions; the processor is configured to execute one or more program instructions to perform the method for controlling state evaluation of a pressure relief valve according to the first aspect.
In a fourth aspect, embodiments of the present invention also provide a computer readable storage medium containing one or more program instructions for being executed with the method for controlling state evaluation of a pressure relief valve according to the first aspect.
The technical scheme provided by the embodiment of the invention has at least the following advantages:
the pressure release valve state evaluation control method, the pressure release valve state evaluation control device and the electronic equipment provided by the embodiment of the invention can accurately and effectively calculate the opening and closing times and the accumulated opening time of the pressure release valve, and when the opening and closing times and the accumulated opening time of the pressure release valve exceed a certain limit value, the pressure release valve state evaluation control method, the pressure release valve state evaluation control device and the electronic equipment send out fault alarm information to remind a driver to replace the pressure release valve, so that the safe operation of a vehicle is ensured.
Drawings
Fig. 1 is a flowchart of a method for controlling state evaluation of a pressure release valve according to an embodiment of the present invention.
FIG. 2 is a flow chart of a rail pressure condition evaluation function according to an embodiment of the present invention.
FIG. 3 is a flow chart of a status function of a pressure relief valve according to an embodiment of the present invention.
Fig. 4 is a block diagram of a state evaluation control device for a pressure release valve according to an embodiment of the present invention.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, interfaces, techniques, etc., in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected" and "connected" are to be construed broadly, and may be connected directly or indirectly through intermediaries, for example. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Fig. 1 is a flowchart of a method for controlling state evaluation of a pressure release valve according to an embodiment of the present invention. As shown in fig. 1, the method for controlling state evaluation of a pressure release valve according to an embodiment of the present invention includes:
s1: and obtaining the rail pressure change gradient in the rail pipe in the common rail system of the engine.
Specifically, according to actual pressure data obtained by the pressure sensor in the rail pipe, calculating a difference value between a pressure value at the current moment and a pressure value at the last moment, and dividing the difference value by the time between two times of value acquisition to obtain a pressure gradient value.
S2: the rail pressure change gradient inside the rail pipe is input into a rail pressure state evaluation function state machine, so that the rail pressure state evaluation function state machine obtains a rail pressure state evaluation value according to the rail pressure change gradient inside the rail pipe and rail pressure change evaluation parameters, and the rail pressure state evaluation value comprises six different rail pressure states.
Specifically, the rail pressure change gradient inside the rail pipe is used as an input quantity to enter a rail pressure state evaluation function state machine. The input of the rail pressure state evaluation function state machine further comprises an actual rail pressure value of the rail pressure sensor, an alternative value of the rail pressure, a fault of the rail pressure sensor, a first-order rail pressure gradient set value, a second-order rail pressure gradient set value, a waiting time set value before calculating average rail pressure after PRV is started, an average rail pressure time set value after PRV is started, a rail pressure deviation range set value, an engine state and a PRV state calculated by the pressure release valve PRV state evaluation function state machine. The output quantity of the state machine is an average rail pressure overrun fault after the PRV is opened, a rail pressure average value and a rail pressure state evaluation value are set after the pressure relief valve is opened, wherein the rail pressure state evaluation value enters a pressure relief valve PRV state evaluation function as input quantity.
TABLE 1 Rail pressure State evaluation function State machine input/output variable List
FIG. 2 is a flow chart of a rail pressure condition evaluation function according to an embodiment of the present invention. As shown in fig. 2, the rail pressure state evaluation includes six states, and first enters a rail pressure initialization state, and after the migration condition is satisfied, sequentially enters a first-order and second-order rail pressure change gradient evaluation state. If the rail pressure evaluation PRV is in the open state, the pressure relief valve is directly judged to be in the open state, and the rail pressure average pressure for a period of time after the pressure relief valve is opened is calculated in the state. If the average pressure value exceeds the set range, the rail pressure overrun state after the pressure relief valve is opened is entered, and the average pressure overrun fault is reported. When the PRV state judges that the closing state condition is met, the rail pressure evaluation relief valve opening state and the rail pressure overrun state after the PRV is opened can enter a first-order rail pressure change gradient state. The state in which rail pressure evaluation calculation is not performed means that when the rail pressure sensor fails, it is jumped from all the states into the state.
The rail pressure evaluation status function has 9 entry and exit conditions between the respective statuses as shown in table 2.
TABLE 2 Rail pressure evaluation State function entry and exit conditions between states
The rail pressure condition assessment function includes six states, the computational logic for each state, as shown in Table 3.
TABLE 3 calculation logic for rail pressure evaluation status function in each status
S3: the rail pressure state evaluation value is input into a pressure relief valve state evaluation state machine, so that the pressure relief valve state evaluation state machine obtains the current opening times and the current accumulated opening times of the pressure relief valve according to the rail pressure state evaluation value, the engine rotating speed, the rail pressure control state, the pressure relief valve operation setting parameters, the historical accumulated opening times and the historical accumulated opening times of the pressure relief valve.
Specifically, after the rail pressure evaluation state machine calculates, the rail pressure state evaluation value result is used as an input quantity to enter a pressure relief valve state evaluation module, and the input quantity of the pressure relief valve state evaluation module further comprises an engine speed, a rail pressure control state, a minimum engine speed set value for enabling the pressure relief valve to be opened after the engine is started, a safety detection waiting time set value after the engine is started, a maximum engine speed set value for enabling the pressure relief valve to be closed, a PRV accumulated opening time maximum set threshold value, a pressure relief valve accumulated opening frequency maximum set threshold value, a pressure wave shock impact time set value after the pressure relief valve is forcedly opened, a waiting for reestablishing a pressure time set value after the pressure relief valve is forcedly opened, a pressure wave shock impact minimum engine speed set value, a last driving cycle pressure relief valve accumulated opening frequency and accumulated opening time.
S4: and alarming when the current opening times of the pressure relief valve is larger than the upper limit of the opening times and/or the current accumulated opening time of the pressure relief valve is larger than the upper limit of the accumulated opening time.
The output variables of the pressure release valve PRV state evaluation state machine function comprise PRV cumulative opening times, PRV cumulative opening time, PRV opening faults, pressure wave shock impact times when the PRV is forcedly opened and pressure release valve PRV states, wherein the PRV states are used as input quantities to enter a rail pressure state evaluation function state machine. If the PRV cumulative opening times reach the maximum set threshold value and the PRV cumulative opening time reaches the maximum set threshold value, the PRV fatigue damage fault is triggered and the driver is reminded of the need of maintaining and replacing the pressure release valve.
The input and output variables of the state evaluation state machine of the pressure release valve PRV are shown in table 4.
Table 4 list of input/output variables for PRV state evaluation function state machine for pressure relief valve
FIG. 3 is a flow chart of a status function of a pressure relief valve according to an embodiment of the present invention. As shown in fig. 3, the pressure release valve PRV state evaluation function includes 5 states, and first enters a PRV initialization state, in which the stored values of the number of times the pressure release valve was opened and the cumulative time in the last driving cycle are read, and the time is counted, and when the engine speed is greater than a certain threshold, the state is entered into a PRV open state, and when the engine speed is less than a certain threshold and the state is in the PRV initialization state for greater than a set time, the state is entered into a PRV closed state. In the PRV on state, the on times and the accumulated on time are calculated, and the current data and the previous driving cycle data are accumulated and then stored in the ECU memory for reading in when the next driving cycle starts. After the accumulated opening times and the opening time reach a certain threshold, fault information is reported to prompt a driver to repair and replace the pressure relief valve. After the PRV is forced to be opened, the PRV is divided into a waiting-for-re-pressing state and a pressure wave shock impact state, and the two states can be mutually converted when the migration condition is met.
Entry and exit conditions between the various states of the PRV state evaluation function are shown in table 5.
TABLE 5PRV State evaluation function entry and exit conditions between states
The calculation logic for the PRV State evaluation function at each state is shown in Table 6.
TABLE 6 calculation logic for PRV State evaluation function at various states
The pressure relief valve state evaluation control method provided by the embodiment of the invention can accurately and effectively calculate the opening and closing times and the accumulated opening time of the pressure relief valve, and when the opening and closing times and the accumulated opening time exceed a certain limit value, the pressure relief valve state evaluation control method sends out fault alarm information to remind a driver to replace the pressure relief valve, so that the safe operation of a vehicle is ensured.
Fig. 4 is a block diagram of a state evaluation control device for a pressure release valve according to an embodiment of the present invention. As shown in fig. 4, a pressure release valve state evaluation control device according to an embodiment of the present invention includes: an acquisition module 100, an alarm module 200 and a control processing module 300.
The acquisition module 100 is used for acquiring the rail pressure change gradient inside the rail pipe in the common rail system of the engine; and an alarm module. The control processing module 300 is configured to input the rail pressure gradient inside the rail pipe to the rail pressure state evaluation function state machine, so that the rail pressure state evaluation function state machine obtains a rail pressure state evaluation value according to the rail pressure gradient inside the rail pipe and the rail pressure variation evaluation parameter, where the rail pressure state evaluation value includes six different rail pressure states. The control processing module 300 is further configured to input the rail pressure state evaluation value to a pressure relief valve state evaluation state machine, so that the pressure relief valve state evaluation state machine obtains a current opening frequency and a current accumulated opening time of the pressure relief valve according to the rail pressure state evaluation value, the engine speed, the rail pressure control state, the pressure relief valve operation setting parameter, the historical accumulated opening frequency and the historical accumulated opening time of the pressure relief valve. The control processing module 300 is further configured to alarm by the alarm module 200 when the current opening times of the pressure relief valve is greater than the upper limit of the opening times and/or the current accumulated opening time of the pressure relief valve is greater than the upper limit of the accumulated opening time.
In one embodiment of the invention, the rail pressure change evaluation parameters include a rail pressure sensor actual rail pressure value, an average rail pressure substitution value, rail pressure sensor fault information, a first order rail pressure gradient set point, a second order rail pressure gradient set point, a pre-calculated average rail pressure wait time set point after a relief valve is opened, a post-calculated average rail pressure time set point after a relief valve is opened, a rail pressure deviation range set point, an engine state, and a relief valve state value.
In one embodiment of the invention, the pressure relief valve operation setting parameters include a minimum engine speed setting for opening the pressure relief valve after engine start, a safety detection waiting time setting for engine start, a maximum engine speed setting for closing the pressure relief valve, a pressure wave shock impact time setting for forced opening the pressure relief valve, a waiting time setting for reestablishment after forced opening the pressure relief valve, and a pressure wave shock impact minimum engine speed setting.
In one embodiment of the present invention, the control processing module 300 is further configured to output the rail pressure average after the relief valve is opened via the rail pressure state evaluation function state machine.
It should be noted that, the specific implementation of the relief valve state evaluation control device according to the embodiment of the present invention is similar to the specific implementation of the relief valve state evaluation control method according to the embodiment of the present invention, and specific reference is made to the description of the relief valve state evaluation control method section, so that redundant descriptions are omitted.
In addition, other configurations and functions of the relief valve state evaluation control device according to the embodiments of the present invention are known to those skilled in the art, and in order to reduce redundancy, description thereof will be omitted.
The embodiment of the invention also provides electronic equipment, which comprises: at least one processor and at least one memory; the memory is used for storing one or more program instructions; the processor is configured to execute one or more program instructions to perform the method for controlling state evaluation of a pressure relief valve according to the first aspect.
The disclosed embodiments provide a computer readable storage medium having stored therein computer program instructions that, when executed on a computer, cause the computer to perform the above-described relief valve state evaluation control method.
In the embodiment of the invention, the processor may be an integrated circuit chip with signal processing capability. The processor may be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP for short), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC for short), a field programmable gate array (Field Programmable Gate Array, FPGA for short), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components.
The disclosed methods, steps, and logic blocks in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The processor reads the information in the storage medium and, in combination with its hardware, performs the steps of the above method.
The storage medium may be memory, for example, may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory.
The nonvolatile memory may be Read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically Erasable ROM (Electrically EPROM, EEPROM), or flash memory.
The volatile memory may be a random access memory (Random Access Memory, RAM for short) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), and direct memory bus RAM (Direct Rambus RAM, DRRAM).
The storage media described in embodiments of the present invention are intended to comprise, without being limited to, these and any other suitable types of memory.
Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present invention may be implemented in a combination of hardware and software. When the software is applied, the corresponding functions may be stored in a computer-readable medium or transmitted as one or more instructions or code on the computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention in further detail, and are not to be construed as limiting the scope of the invention, but are merely intended to cover any modifications, equivalents, improvements, etc. based on the teachings of the invention.
Claims (10)
1. A pressure release valve state evaluation control method, characterized by comprising:
acquiring a rail pressure change gradient in a rail pipe in an engine common rail system;
inputting the rail pressure change gradient in the rail pipe to a rail pressure state evaluation functional state machine, so that the rail pressure state evaluation functional state machine obtains a rail pressure state evaluation value according to the rail pressure change gradient in the rail pipe and rail pressure change evaluation parameters, wherein the rail pressure state evaluation comprises six different rail pressure states: firstly, entering a rail pressure initialization state, and sequentially entering a first-order and second-order rail pressure change gradient evaluation state after a migration condition is met; if the pressure relief valve enters the opening state of the pressure relief valve, calculating the rail pressure average pressure for a period of time after the pressure relief valve is opened; if the average pressure value exceeds the set range, entering a rail pressure overrun state after the pressure relief valve is opened, and reporting an average pressure overrun fault; when the pressure relief valve meets the condition of a closed state, the rail pressure evaluation pressure relief valve is in an open state, and the rail pressure overrun state after the pressure relief valve is opened enters a first-order rail pressure change gradient evaluation state; when the rail pressure sensor fails, jumping from all states to a state in which rail pressure evaluation calculation is not performed;
inputting the rail pressure state evaluation value into a pressure release valve state evaluation state machine, so that the pressure release valve state evaluation state machine obtains the current opening times and the current accumulated opening time of the pressure release valve according to the rail pressure state evaluation value, the engine speed, the rail pressure control state, the pressure release valve operation setting parameters, the historical accumulated opening times and the historical accumulated opening time of the pressure release valve;
and alarming when the current opening times of the pressure relief valve is larger than the upper limit of the opening times and/or the current accumulated opening time of the pressure relief valve is larger than the upper limit of the accumulated opening time.
2. The pressure relief valve state evaluation control method according to claim 1, wherein the rail pressure change evaluation parameter includes a rail pressure sensor actual rail pressure value, an average rail pressure substitution value, rail pressure sensor failure information, a first-order rail pressure gradient set value, a second-order rail pressure gradient set value, a waiting time set value before calculating an average rail pressure after opening the pressure relief valve, an average rail pressure time set value after calculating the pressure relief valve, a rail pressure deviation range set value, an engine state, and a pressure relief valve state value.
3. The pressure relief valve state evaluation control method according to claim 1, wherein the pressure relief valve operation setting parameters include a minimum engine speed setting value for opening the pressure relief valve after engine start, a safety detection waiting time setting value after engine start, a maximum engine speed setting value for closing the pressure relief valve, a pressure wave shock impact time setting value after the pressure relief valve is forcibly opened, a waiting time setting value for rebuilding after the pressure relief valve is forcibly opened, and a pressure wave shock impact minimum engine speed setting value.
4. The relief valve state evaluation control method according to claim 1, characterized by further comprising: and outputting a rail pressure average value after the pressure release valve is opened through the rail pressure state evaluation function state machine.
5. A relief valve state evaluation control device, characterized by comprising:
the acquisition module is used for acquiring the rail pressure change gradient in the rail pipe in the common rail system of the engine;
an alarm module;
the control processing module is used for inputting the rail pressure change gradient in the rail pipe to a rail pressure state evaluation functional state machine so that the rail pressure state evaluation functional state machine obtains a rail pressure state evaluation value according to the rail pressure change gradient in the rail pipe and rail pressure change evaluation parameters, and the rail pressure state evaluation comprises six different rail pressure states: firstly, entering a rail pressure initialization state, and sequentially entering a first-order and second-order rail pressure change gradient evaluation state after a migration condition is met; if the pressure relief valve enters the opening state of the pressure relief valve, calculating the rail pressure average pressure for a period of time after the pressure relief valve is opened; if the average pressure value exceeds the set range, entering a rail pressure overrun state after the pressure relief valve is opened, and reporting an average pressure overrun fault; when the pressure relief valve meets the condition of a closed state, the rail pressure evaluation pressure relief valve is in an open state, and the rail pressure overrun state after the pressure relief valve is opened enters a first-order rail pressure change gradient evaluation state; when the rail pressure sensor fails, jumping from all states to a state in which rail pressure evaluation calculation is not performed; the control processing module is also used for inputting the rail pressure state evaluation value into a pressure relief valve state evaluation state machine so that the pressure relief valve state evaluation state machine obtains the current opening times and the current accumulated opening time of the pressure relief valve according to the rail pressure state evaluation value, the engine speed, the rail pressure control state, the pressure relief valve operation setting parameters, the historical accumulated opening times and the historical accumulated opening time of the pressure relief valve; the control processing module is also used for alarming through the alarm module when the current opening times of the pressure relief valve is larger than the upper limit of the opening times and/or the current accumulated opening time of the pressure relief valve is larger than the upper limit of the accumulated opening time.
6. The pressure relief valve state evaluation control device according to claim 5, wherein the rail pressure change evaluation parameter includes a rail pressure sensor actual rail pressure value, an average rail pressure substitution value, rail pressure sensor failure information, a first-order rail pressure gradient set value, a second-order rail pressure gradient set value, a waiting time set value before calculating an average rail pressure after opening the pressure relief valve, an average rail pressure time set value after calculating the pressure relief valve, a rail pressure deviation range set value, an engine state, and a pressure relief valve state value.
7. The pressure relief valve state evaluation control device according to claim 5, wherein the pressure relief valve operation setting parameters include a minimum engine speed setting value for causing the pressure relief valve to open after engine start, a safety detection waiting time setting value for causing the pressure relief valve to close after engine start, a maximum engine speed setting value for causing the pressure relief valve to close, a pressure wave shock impact time setting value for causing the pressure relief valve to be forcibly opened, a waiting time setting value for reestablishing after the pressure relief valve is forcibly opened, and a pressure wave shock impact minimum engine speed setting value.
8. The pressure relief valve condition evaluation control device of claim 5, wherein the control processing module is further configured to output a rail pressure average value after a pressure relief valve is opened via the rail pressure condition evaluation function state machine.
9. An electronic device, the electronic device comprising: at least one processor and at least one memory;
the memory is used for storing one or more program instructions;
the processor configured to execute one or more program instructions to perform the pressure relief valve state assessment control method of any one of claims 1-4.
10. A computer-readable storage medium, wherein one or more program instructions for executing the relief valve state evaluation control method according to any one of claims 1-4 are contained in the computer-readable storage medium.
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