A control method and system of an engine, an electronic device and a storage medium

Abstract

The application provides an engine control method, system, electronic equipment and storage medium, relates to the field of engine operation control, and aims to solve the problem that the valve sticking condition is difficult to be disposed in the low-temperature and low-load operation of the engine at present. The valve sticking is confirmed by acquiring the oil supply pressure, the number of cylinders actually doing work is reduced, at least one cylinder with sticking is operated, the single-cylinder power of the cylinder with sticking and operation is improved, the exhaust temperature is improved, the sticking substance is burned, the valve sticking condition is improved, and the operation reliability of the engine is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine operation control, in particular to an engine control method, system, electronic device and storage medium. BACKGROUND

[0002] When a refrigerated truck or cold chain logistics vehicle operates in winter or cold regions, the engine intake temperature is low due to the low ambient temperature, and at the same time, the on-board equipment needs to operate for a long time, resulting in the engine being in a partial load operation or a long-time idle low load operation state. When the engine operates for a long time under low load in a low-temperature environment, the low intake temperature and low water temperature will cause poor fuel combustion, resulting in a large amount of unburned products. The unburned products and the accumulated carbon are mixed into a gelatinous substance, which adheres to the exhaust valve and enters the valve guide with the movement of the valve, causing the valve and guide to stick and jam, and further causing serious faults such as valve collision with piston.

[0003] A control method, control device, storage medium and processor of an engine are disclosed in a Chinese patent (publication number: CN117189383A). The operation condition of the engine is determined according to the ambient temperature and the engine load rate. When the engine load is too low and the cylinder temperature is too low, the engine is controlled to enter a deactivation mode, thereby increasing the load rate of the individual cylinder to reduce the risk of valve sticking. However, the current method cannot effectively monitor the sticking of the valve and the valve guide. It can only slow down the occurrence of valve sticking by deactivating the cylinder in a specific pattern, which is not very targeted. It is difficult to deal with the condition of valve sticking in a targeted manner, and the engine may be damaged and fail due to valve sticking if it is not dealt with in time. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide an engine control method, system, electronic device and storage medium. By obtaining the oil supply pressure to determine whether the valve is stuck, the cylinder corresponding to the stuck valve is kept running, and the cylinder without valve sticking is stopped. The number of cylinders actually doing work is reduced, thereby increasing the single-cylinder power of the cylinder with valve sticking and improving the exhaust temperature, so as to burn off the generated sticking material, improve the valve sticking condition, and improve the operation reliability of the engine.

[0005] The first purpose of the present application is to provide an engine control method, which adopts the following scheme:

[0006] Comprises:

[0007] Obtain the oil supply pressure, which is the pressure of the lubricating oil channel in the rocker arm;

[0008] When the oil supply pressure is in the preset oil pressure range, it is determined that valve sticking does not occur, and the engine operates normally.

[0009] When the oil supply pressure is greater than the preset oil pressure range, it is determined that valve sticking does not occur, and the valve clearance is adjusted.

[0010] When the oil supply pressure is less than the preset oil pressure range, it is determined that valve sticking occurs, and part of the cylinders of the engine are controlled to stop working, and at least one cylinder in which valve sticking occurs is kept working.

[0011] The preset oil pressure range is an oil pressure range in the lubricating oil passage when the cylinder does not have valve sticking and operates normally.

[0012] Further, when the oil supply pressure is in the preset oil pressure range, it is determined that the valve clearance is in the set clearance range, and the valve clearance corresponding to the cylinder is kept.

[0013] Further, when the oil supply pressure is greater than the preset oil pressure range, it is determined that the valve clearance is less than the set clearance range, and the valve clearance is increased to be in the set clearance range.

[0014] Further, when the oil supply pressure is less than the preset oil pressure range, it is determined that the valve clearance is greater than the set clearance range.

[0015] Further, the preset oil pressure range is determined according to the contact state of the rocker pad and the push rod ball head of the cylinder, and when the oil supply pressure is in the preset oil pressure range, the oil supply pressure and the pressure limiting spring pushing the push rod ball head are balanced.

[0016] Further, the control of the part of the cylinders of the engine to stop working includes: obtaining the cylinder order of the cylinder in which the valve guide sticking occurs, and controlling the cylinders of the engine in which the valve guide sticking does not occur to stop working.

[0017] Further, after the part of the cylinders of the engine is controlled to stop working, the exhaust temperature of the cylinder in which the valve sticking occurs is increased; after the part of the cylinders of the engine is controlled to stop working for a set time, the engine operates normally, the oil supply pressure is monitored again, and if the oil supply pressure is still less than the preset oil pressure range, the valve clearance is adjusted.

[0018] The second object of the application is to provide a control system of an engine, comprising:

[0019] The acquisition unit is configured to acquire an oil supply pressure, the oil supply pressure being a pressure of a lubricating oil passage in a rocker arm;

[0020] The control unit is configured to: when the oil supply pressure is in a preset oil pressure range, determine that valve sticking does not occur, and the engine operates normally; when the oil supply pressure is greater than the preset oil pressure range, determine that valve sticking does not occur, and adjust the valve clearance; and when the oil supply pressure is less than the preset oil pressure range, determine that valve sticking occurs, control part of the cylinders of the engine to stop working, and keep at least one cylinder in which valve sticking occurs working.

[0021] The preset oil pressure range is an oil pressure range in the lubricating oil passage when the cylinder does not have valve sticking and normally operates.

[0022] A third object of the present application is to provide an electronic device comprising a processor and a memory having stored thereon computer instructions that, when executed by the processor, cause the electronic device to perform the control method of the engine according to the first object.

[0023] A fourth object of the present application is to provide a computer-readable storage medium comprising a stored program, wherein the program, when executed, controls the device in which the computer-readable storage medium is located to perform the control method of the engine according to the first object.

[0024] Compared with the prior art, the present application has the advantages and positive effects that:

[0025] (1) For the problem that it is difficult to deal with the valve sticking condition when the engine operates at low temperature and low load, the present application confirms whether the valve sticks by obtaining the oil supply pressure, reduces the number of cylinders that actually work, and makes at least one cylinder in which valve sticking occurs work, thereby improving the single-cylinder power of the cylinder in which valve sticking occurs and keeps working, improving the exhaust temperature, burning the generated sticking material, improving the valve sticking condition, and improving the operation reliability of the engine.

[0026] (2) For a multi-cylinder engine, the valve sticking condition of each cylinder rocker arm inner lubricating oil passage can be identified according to the pressure of the lubricating oil passage, after identification, all cylinders in which the valve does not stick can be controlled to stop working, and the cylinder in which the valve sticks can be kept working, thereby improving the single-cylinder power of the cylinder in which the valve sticks.

[0027] (3) When the valve sticks, the reset of the valve will be stuck, causing the valve clearance to increase, the oil in the lubricating oil passage will leak from the push rod ball head and the rocker arm pad piece, causing the oil supply pressure to rapidly decrease, achieving the use of the oil supply pressure to realize the judgment of the valve sticking, and improving the identification efficiency of the valve working state.

[0028] (4) can also identify the working condition of too small valve clearance according to the pressure of lubricating oil channel in each cylinder rocker arm, when the valve clearance is too small, the oil pressure in the lubricating oil channel will be greater than the oil pressure in normal working, determine the oil pressure is too small and alarm, adjust the valve clearance. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein by reference. The illustrations are shown schematically and are not intended to limit the application.

[0030] Figure 1 The structure diagram of valve timing system of engine in embodiment 1-4 of the present application.

[0031] Figure 2 The schematic diagram of lubricating oil channel in rocker arm of engine in embodiment 1-4 of the present application.

[0032] Figure 3 The flow chart of judging valve clearance based on oil supply pressure in embodiment 1-4 of the present application.

[0033] In the figure, 1. rocker arm, 2. push rod, 3. rocker arm seat, 4. valve, 5. valve bridge, 6. rocker arm shaft, 7. pressure sensor, 8. tappet, 9. camshaft, 10. limit block, 11. push rod ball head, 12. rocker arm pad, 13. pressure limiting spring, 14. oil channel, 15. elephant foot. DETAILED DESCRIPTION

[0034] Embodiment 1

[0035] In a typical embodiment of the present application, as shown in Figures 1-3 , a control method of engine is given.

[0036] The structure of valve timing system of single cylinder of multi-cylinder engine is shown in Figure 1 , the camshaft 9 rotates, the reciprocating motion of tappet 8 is realized by the change of cam shape, the motion of tappet 8 is transmitted to rocker arm 1 by push rod 2, the rocker arm 1 swings around rocker arm shaft 6, the rocker arm shaft 6 is installed on rocker arm seat 3, the reciprocating motion of tappet 8 is converted into reciprocating motion of valve 4, so as to realize the opening and closing of valve 4 according to the designed rule, and then realize the intake and exhaust of engine according to the designed rule.

[0037] The structure of rocker arm 1 is shown in Figure 2As shown, the rocker arm 1 is internally provided with a lubricating oil channel, the rocker arm 1 is installed on the rocker shaft 6, and the oil channel 14 in the rocker shaft 6 is in communication with the lubricating oil channel in the rocker arm 1. One end of the rocker arm 1 is connected to the valve bridge 5 through the elephant foot 15, and the valve bridge 5 can drive the valve 4 to move; the other end of the rocker arm 1 is provided with a rocker pad 12, the rocker pad 12 is provided with a groove and is in communication with the lubricating oil channel, one end of the push rod 2 is slidably connected with a push rod ball head 11, the push rod ball head 11 abuts on the push rod 2 through a pressure limiting spring 13, the push rod ball head 11 abuts on the groove, and a structure similar to a one-way valve is formed between the rocker pad 12 and the push rod ball head 11. The lubricating oil in the lubricating oil channel can push the push rod ball head 11 to move in the groove of the rocker pad 12, so that the lubricating oil is discharged from the groove, the moving range of the push rod ball head 11 relative to the push rod 2 determines the discharge pressure of the lubricating oil, and the moving range of the push rod ball head 11 relative to the push rod 2 is affected by the gap between the valve bridge 5 and the elephant foot 15 of the rocker arm 1, that is, affected by the valve gap. The moving range of the push rod ball head 11 relative to the push rod 2 is determined by a limiting block 10, and the limiting block 10 is installed at the sliding connection position of the push rod ball head 11 and the push rod 2.

[0038] The valve gap is the gap between the valve bridge 5 and the elephant foot 15 of the rocker arm 1, and is used to compensate for the size change caused by thermal expansion.

[0039] When the lubricating oil in the lubricating oil channel cannot push the push rod ball head 11, it indicates that the push rod ball head 11 abuts on the rocker pad 12 tightly, the pressure limiting spring 13 has no compression allowance, the valve gap is too small, and the oil pressure in the lubricating oil channel is also relatively high; when the lubricating oil in the lubricating oil channel can just push the push rod ball head 11, it indicates that the elastic force of the pressure limiting spring 13 on the push rod ball head 11 is balanced with the oil pressure in the lubricating oil channel, the valve gap is in a normal range, and the oil pressure in the lubricating oil channel fluctuates in a normal range; when the lubricating oil in the lubricating oil channel is directly discharged from the position of the rocker pad 12 without resistance, it indicates that the push rod ball head 11 is separated from the rocker pad 12, the pressure limiting spring 13 has no elongation allowance, the valve gap is too large, the stable oil pressure in the lubricating oil channel is discharged from the position of the rocker pad 12, and the pressure in the lubricating oil channel is relatively low.

[0040] In the embodiment, a control method of an engine comprises:

[0041] An oil supply pressure is obtained, and the oil supply pressure is the pressure of the lubricating oil channel in the rocker arm 1;

[0042] When the oil supply pressure is in a preset oil pressure range, it is determined that the valve 4 is not stuck, and the engine is normally operated;

[0043] When the oil supply pressure is greater than the preset oil pressure range, it is determined that the valve 4 is not stuck, and the valve gap is adjusted;

[0044] When the oil supply pressure is less than the preset oil pressure range, it is determined that the valve 4 is stuck, and the engine is controlled to stop working in part of the cylinder and keep at least one cylinder working with the stuck valve;

[0045] The preset oil pressure range is the oil pressure range in the lubricating oil passage when the cylinder is not stuck with the valve 4 and the cylinder is normally running.

[0046] The oil supply pressure of the rocker shaft 6 is detected by adding a pressure sensor 7 on the rocker shaft 6, so as to be the oil supply pressure of the lubricating oil passage in the rocker arm 1. In other optional embodiments, the oil supply pressure can also be measured by other ways, such as setting a liquid pressure sensor 7 on the pipeline for conveying lubricating oil to the rocker shaft 6, etc. The lubricating oil can be engine oil, and the oil supply pressure is the engine oil pressure in the lubricating oil passage.

[0047] When the oil supply pressure is in the preset oil pressure range, it is determined that the valve 4 gap is in the set gap range, and the valve 4 gap corresponding to the cylinder is kept; the set gap range is the range of the valve 4 gap when the engine is normally running.

[0048] When the oil supply pressure is greater than the preset oil pressure range, it is determined that the valve 4 gap is less than the set gap range, and the valve 4 gap is increased to be in the set gap range.

[0049] When the oil supply pressure is less than the preset oil pressure range, it is determined that the valve 4 gap is greater than the set gap range.

[0050] The preset oil pressure range is determined according to the contact state of the rocker pad 12 and the push rod ball head 11 of the cylinder, and when the oil supply pressure is in the preset oil pressure range, the oil supply pressure is balanced with the pressure limiting spring 13 pushing the push rod ball head 11. For obtaining the preset oil pressure range, the oil pressure in the lubricating oil passage is measured when the engine cylinder is not stuck with the valve 4 under the normal running condition of the engine, and the preset oil pressure range is determined based on the maximum value and the minimum value.

[0051] As shown in Figure 3 The maximum value of the preset oil pressure range is determined by adjusting the valve 4 gap to 0. When the valve 4 gap is adjusted to 0, the engine cylinder is short-time running, and the engine oil pressure of the rocker shaft 6 is recorded as P1'. It can be understood that P1' can be appropriately increased to P1, P1>P1', and when the oil supply pressure is P during the engine running, and P is greater than P1' and close to P1, it can be determined that the valve 4 gap is too small.

[0052] Similarly, the minimum value of the preset oil pressure range is determined by adjusting the valve 4 gap to exceed the normal working state, as shown in Figure 3As shown, the valve 4 gap is adjusted to a set value, which is greater than the valve 4 gap in the normal working state, and the oil pressure of the rocker arm shaft 6 of the short-time running cylinder is recorded as P2'. It can be understood that P2' can also be appropriately increased to P2, P2

[0053] In this embodiment, after P1 and P2 are obtained, the engine is normally operated, and the oil pressure of the rocker arm shaft 6 is detected in real time as P, and the oil supply pressure of the lubricating oil passage in the rocker arm 1 is also P. If P is close to P1, it is determined that the valve 4 gap is too small, and an alarm information is sent to remind the operator to adjust the valve 4 gap; if P is close to P2, it is determined that the valve 4 gap is too large due to the adhesion of the valve 4 and the inability to rebound, and the cylinder temperature of the cylinder where the adhesion occurs is increased by executing the cylinder cut-off strategy.

[0054] For a multi-cylinder engine, a certain cylinder is not injected with fuel and does not do work, and then this cylinder is cut off, that is, the cylinder stops working. It can be understood that in this embodiment, the part of the engine is controlled to stop working, and at least one cylinder where the valve adhesion occurs is kept working, which means that at least one cylinder where the valve adhesion occurs is kept working, and at least one cylinder where the valve adhesion occurs or normally operates is stopped working.

[0055] In specific implementation, the following modes can be selected:

[0056] All cylinders where the valve adhesion occurs are kept running, and all cylinders where the valve adhesion does not occur are controlled to stop running.

[0057] All cylinders where the valve adhesion occurs are kept running, and one cylinder where the valve adhesion does not occur is controlled to stop running.

[0058] One cylinder where the valve adhesion occurs is kept running, and all other cylinders are controlled to stop running.

[0059] One cylinder where the valve adhesion occurs is kept running, and one cylinder where the valve adhesion occurs is controlled to stop running.

[0060] In other optional embodiments, the specific implementation mode can be selected and adjusted according to actual needs.

[0061] In combination with Figure 1 , Figure 2 and Figure 3When the normal valve 4 gap exists, the lubricating oil pushes the push rod ball head 11 to move downward, forming oil leakage, similar to the action of a one-way valve, the oil supply pressure and the spring force form a balance, and the oil pressure in the lubricating oil passage fluctuates in a small range. When the valve 4 gap is too small, the push rod ball head 11 is compressed to the push rod 2 shaft, the push rod ball head 11 cannot move, and the oil supply pressure is greater than the pressure in the lubricating oil passage when the normal valve 4 gap exists. When the valve 4 gap is too large, the push rod ball head 11 extends out of the shaft to the limit block 10, and the ball head cannot continue to elongate at this time. At this time, the valve 4 gap still exists, and the lubricating oil passage cannot establish a stable pressure. The lubricating oil in the rocker arm 1 is depressurized, and the pressure in the lubricating oil passage is also reduced to 0.

[0062] Since the engine adopts multiple cylinders, each cylinder is provided with a corresponding valve system, and the cylinder times of the cylinder in which the valve 4 conduit adhesion occurs are obtained, and the engine in which the valve 4 conduit adhesion does not occur is controlled to stop working.

[0063] After the working of part of the cylinders of the engine is controlled to stop, the exhaust temperature of the cylinder in which the valve 4 adhesion occurs can be improved, so that the adhesion generated is burned off, thereby improving the valve 4 conduit adhesion condition, and the reliability of the engine is improved.

[0064] After the working of part of the cylinders of the engine is controlled to stop for a set duration, the problem of the large valve 4 gap caused by the valve 4 adhesion is solved, the engine is restored to normal operation, the oil supply pressure is monitored again, and if the oil supply pressure is still less than the preset oil pressure interval, the valve 4 is faulty, and the valve 4 gap is adjusted.

[0065] The valve 4 adhesion condition of each cylinder can be identified according to the pressure in the lubricating oil passage of the rocker arm 1 of each cylinder. When the valve 4 adhesion occurs, the reset of the valve 4 will be stuck, which will cause the valve 4 gap to increase, the oil in the lubricating oil passage will leak from the push rod ball head 11 and the rocker arm pad 12, and the oil supply pressure will rapidly decrease. Therefore, the oil supply pressure can be used to judge the valve 4 adhesion, and the identification efficiency of the working state of the valve 4 is improved.

[0066] Embodiment 2

[0067] In another typical embodiment of the present application, as shown in Figures 1-3 a control system of an engine is given.

[0068] A control system of an engine comprises:

[0069] An acquisition unit is configured to acquire an oil supply pressure, the oil supply pressure being a pressure in a lubricating oil passage in a rocker arm 1;

[0070] The control unit is configured to: when the oil supply pressure is in a preset oil pressure range, determine that the valve 4 sticking does not occur, and the engine normally operates; when the oil supply pressure is greater than the preset oil pressure range, determine that the valve 4 sticking does not occur, and adjust the valve 4 gap; and when the oil supply pressure is less than the preset oil pressure range, determine that the valve 4 sticking occurs, control part of the cylinders of the engine to stop working, and keep at least one cylinder in which the valve sticking occurs to work.

[0071] The preset oil pressure range is an oil pressure range in the lubricating oil passage when the cylinder does not have the valve 4 sticking and normally operates.

[0072] The working process of the control system of the engine is described in the content of Embodiment 1, and will not be repeated here.

[0073] Embodiment 3

[0074] In another embodiment of the present application, as shown in Figures 1-3 An electronic device is given.

[0075] The electronic device includes one or more processors, one or more memories coupled to the processors, and a communication module coupled to the processors.

[0076] The memory can include one or more non-volatile memories and one or more volatile memories. Examples of the non-volatile memory include, but are not limited to, at least one of a Read-Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), a flash memory, a hard disk, a Compact Disc (CD), a Digital Versatile Disc (DVD), or other magnetic storage and / or optical storage. Examples of the volatile memory include, but are not limited to, at least one of a Random Access Memory (RAM), or other volatile memory that does not last for a power-off duration. The computer program can be stored in the ROM. The processor implements the above-mentioned engine control method when executing the computer program.

[0077] Embodiment 4

[0078] In another embodiment of the present application, as shown in Figures 1-3 A computer readable storage medium is given.

[0079] The program can be tangibly embodied in a computer readable medium which can include memory (such as internal memory 130 or other storage) in the device or another storage device accessed by the device. The program can be loaded from the computer readable medium into RAM for execution by the processor. The computer readable medium can include any type of tangible non-transitory memory, such as ROM, EPROM, flash memory, a hard disk, the computer readable storage medium storing a computer program which, when executed by the processor, implements the control method of the engine as in Embodiment 1.

[0080] The above descriptions are merely specific embodiments of the present application, but are not intended to limit the present application. Various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A control method of an engine characterized by comprising: The method comprises: obtaining a supply oil pressure, the supply oil pressure being a pressure of a lubricating oil passage in a rocker arm; when the supply oil pressure is in a preset oil pressure range, determining that valve sticking does not occur, and the engine is in normal operation; when the supply oil pressure is greater than the preset oil pressure range, determining that valve sticking does not occur, and adjusting a valve clearance; when the supply oil pressure is less than the preset oil pressure range, determining that valve sticking occurs, controlling part of cylinders of the engine to stop working, and keeping at least one cylinder in which valve sticking occurs working; wherein the preset oil pressure range is an oil pressure range in the lubricating oil passage when the cylinder does not have valve sticking and the cylinder is in normal operation.

2. The control method of the engine according to claim 1, characterized by, when the supply oil pressure is in the preset oil pressure range, determining that the valve clearance is in a set clearance range, and keeping the valve clearance corresponding to the cylinder; 3. The control method of the engine according to claim 2, characterized by, when the supply oil pressure is greater than the preset oil pressure range, determining that the valve clearance is less than the set clearance range, and increasing the valve clearance to be in the set clearance range.

4. The control method of the engine according to claim 1, characterized by, when the supply oil pressure is less than the preset oil pressure range, determining that the valve clearance is greater than the set clearance range.

5. The control method of an engine according to claim 1 or 4, characterized by, The preset oil pressure range is determined according to a contact state of a rocker pad and a push rod ball head of the cylinder, and when the supply oil pressure is in the preset oil pressure range, the supply oil pressure and a pressure limiting spring pushing the push rod ball head are balanced.

6. The control method of an engine according to claim 1, characterized by, After controlling part of the cylinders of the engine to stop working, the exhaust temperature of the cylinder in which valve sticking occurs is increased; after controlling part of the cylinders of the engine to stop working for a set time length, the engine is restored to normal operation, the supply oil pressure is monitored again, and if the supply oil pressure is still less than the preset oil pressure range, the valve clearance is adjusted.

7. A control system of an engine characterized by comprising: The method comprises: an obtaining unit configured to obtain a supply oil pressure, the supply oil pressure being a pressure of a lubricating oil passage in a rocker arm; a control unit configured to, when the supply oil pressure is in a preset oil pressure range, determine that valve sticking does not occur, and the engine is in normal operation; when the supply oil pressure is greater than the preset oil pressure range, determine that valve sticking does not occur, and adjust a valve clearance; and when the supply oil pressure is less than the preset oil pressure range, determine that valve sticking occurs, control part of cylinders of the engine to stop working, and keep at least one cylinder in which valve sticking occurs working. wherein the preset oil pressure range is an oil pressure range in the lubricating oil passage when the cylinder does not have valve sticking and the cylinder is in normal operation.

8. An electronic device, comprising: The electronic device comprises a processor and a memory, and the memory stores computer instructions, when the computer instructions are executed by the processor, the electronic device executes the control method of the engine in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored program, wherein when the program runs, the device in which the computer readable storage medium is located executes the control method of the engine in any one of claims 1-6.

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