CN113587801A - Valve clearance early warning device, method and equipment and engine - Google Patents

Valve clearance early warning device, method and equipment and engine Download PDF

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Publication number
CN113587801A
CN113587801A CN202110794693.6A CN202110794693A CN113587801A CN 113587801 A CN113587801 A CN 113587801A CN 202110794693 A CN202110794693 A CN 202110794693A CN 113587801 A CN113587801 A CN 113587801A
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China
Prior art keywords
valve
resistance
lift
determining
early warning
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CN202110794693.6A
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Chinese (zh)
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CN113587801B (en
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孙善良
岳永丽
王金东
姚久元
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The embodiment of the application discloses valve clearance early warning device, method, equipment and engine, and valve clearance early warning device includes electrically conductive gleitbretter, resistance block and ohmmeter, wherein: the conductive sliding sheet is fixed on the rod part of the air valve; the resistance block is fixed on a cylinder cover of the valve and is connected with the conductive slide sheet in a sliding manner so as to slide along with the movement of the valve; the resistance meter is connected with the resistance block and the conductive sliding sheet through a lead and used for measuring each resistance value when the resistance block slides, and the resistance value is used for early warning of the valve clearance. Therefore, valve clearance early warning is achieved according to the measured resistance value, and the running performance of the engine is improved.

Description

Valve clearance early warning device, method and equipment and engine
Technical Field
The application relates to the technical field of engines, in particular to a valve clearance early warning device, a method, equipment and an engine.
Background
Valve lash is an important factor that directly affects engine dynamics, economy, operational reliability, and the like. The valve clearance is too large, so that the opening degree of an intake valve is reduced, the opening time is shortened, insufficient air intake is caused, and the power of an engine is reduced; meanwhile, the opening degree of an exhaust valve is reduced, the opening time is shortened, the exhaust is not smooth, the waste gas in a combustion chamber is increased, and the economy of the engine is deteriorated. In addition, there is generated an impact sound between the transmission members and between the valve and the valve seat ring. The air valve clearance is too small, so that the air inlet valve is not closed tightly, air leakage of the engine is possible in a hot state, the power of the engine is reduced, and the oil consumption is increased; meanwhile, the exhaust valve is not closed tightly, so that the compression pressure of the engine is reduced, the power is reduced, and the oil consumption is increased.
Therefore, early warning is carried out on the valve clearance of the engine, and the influence of overlarge or undersize valve clearance on the performance of the engine is avoided, which is particularly important.
Disclosure of Invention
The embodiment of the application provides a valve clearance early warning device, a valve clearance early warning method, valve clearance early warning equipment and an engine, which are used for determining whether the valve clearance of the engine needs to be adjusted according to measured resistance, so that the running performance of the engine is improved.
In a first aspect, an embodiment of the present application provides a valve clearance early warning device, including: ohmmeter, resistance block and electrically conductive gleitbretter, wherein:
the conductive sliding sheet is fixed on the rod part of the air valve;
the resistance block is fixed on a cylinder cover of the valve and is connected with the conductive sliding sheet in a sliding mode so as to slide along with the movement of the valve;
the resistance meter is connected with the resistance block and the conductive sliding sheet through leads and used for measuring each resistance value when the resistance block slides, and the resistance value is used for valve clearance early warning.
In the embodiment of the application, the resistance meter, the resistance block and the conductive sliding sheet form a closed loop, the resistance block slides along with the movement of the valve, the effective length of the resistance block connected into the loop changes, and then the resistance value measured by the resistance meter changes, so that the valve running length can be determined according to the change of the resistance value, and then whether the valve clearance needs to be adjusted or not is determined according to the valve running length, and valve clearance early warning is carried out if the valve clearance needs to be adjusted. Therefore, valve clearance early warning is achieved according to the measured resistance value, and the running performance of the engine is improved.
In some exemplary embodiments, the stem portion of the valve is provided with a groove.
In some exemplary embodiments, the first end of the conductive sliding piece is a ring structure, and the first end of the conductive sliding piece is fixed at a groove of the rod part of the valve.
Above-mentioned embodiment, the electrically conductive gleitbretter of loop configuration is fixed in the groove of the pole portion of valve department, has avoided electrically conductive gleitbretter and valve guide contact friction and electrically conductive gleitbretter jamming fracture when the valve rotates.
In some exemplary embodiments, the second end of the conductive sliding piece is a snap structure, and the resistance block is connected with the conductive sliding piece through the snap structure and slides in the snap along with the movement of the valve.
In the embodiment, the resistance block is used for measuring the change of the resistance value along with the movement of the valve, so that the running length of the valve is determined.
In some exemplary embodiments, the apparatus further comprises a power source connected in a closed loop formed by the conductive slider, the resistive block and the ohmmeter.
In a second aspect, an embodiment of the present application provides a valve clearance warning method, which is applied to the valve clearance warning device in the first aspect, and the method includes:
acquiring a first maximum resistance value and a first minimum resistance value of the resistance block in the process of changing the valve from a closed state to an open state within a first preset time period, and a second maximum resistance value and a second minimum resistance value of the resistance block in the process of changing the valve from the closed state to the open state within a second preset time period, wherein the ending time of the first preset time period is earlier than the starting time of the second preset time period;
determining a first lift of the valve according to the first maximum resistance and the first minimum resistance, and determining a second lift of the valve according to the second maximum resistance and the second minimum resistance;
and if the difference between the first lift and the second lift exceeds a preset lift range, performing valve clearance early warning.
In the embodiment of the application, the lift ranges of the valve in the two preset durations are determined by determining the change of the resistance value of the valve from the closed state to the open state in the two preset durations without time crossing, and then whether the difference of the two lift ranges exceeds the preset lift range is judged, and if the difference exceeds the preset lift range, valve clearance early warning is carried out. Therefore, whether the valve clearance of the engine needs to be adjusted or not is judged in real time through valve clearance early warning, and therefore the running performance of the engine is improved.
In some exemplary embodiments, said determining a first lift of said valve based on said first maximum resistance and said first minimum resistance comprises:
determining a first effective access length of the resistance block according to the first maximum resistance;
determining a second effective access length of the resistance block according to the first minimum resistance;
determining the difference between the first effective access length and the second effective length as a first lift of the valve;
the determining a second lift of the valve based on the second maximum resistance and the second minimum resistance includes:
determining a third effective access length of the resistance block according to the second maximum resistance;
determining a fourth effective access length of the resistance block according to the second minimum resistance;
determining a difference between the third effective engagement length and the fourth effective length as a second lift of the valve.
In some exemplary embodiments, the starting time of the first preset period is a starting operation time of an engine.
In a third aspect, an embodiment of the present application provides a valve clearance warning apparatus, including a memory, an electronic control unit, and a computer program stored on the memory and operable on the electronic control unit, wherein the electronic control unit implements the steps of any one of the above methods when executing the computer program.
In a fourth aspect, an embodiment of the present application provides a valve clearance early warning device, which is integrated in a valve clearance early warning apparatus, including a resistance value obtaining module, a lift determining module, and an early warning module, wherein:
the resistance value acquisition module is used for acquiring a first maximum resistance value and a first minimum resistance value of the resistance block in the process of turning on the valve from the closed state in a first preset time length, and a second maximum resistance value and a second minimum resistance value of the resistance block in the process of turning on the valve from the closed state in a second preset time length, wherein the ending time of the first preset time length is earlier than the starting time of the second preset time length;
a lift determination module to determine a first lift of the valve based on the first maximum resistance and the first minimum resistance and to determine a second lift of the valve based on the second maximum resistance and the second minimum resistance;
and the early warning module is used for carrying out early warning on the valve clearance if the difference between the first lift and the second lift exceeds a preset lift range.
In some exemplary embodiments, the lift determination module is specifically configured to:
determining a first effective access length of the resistance block according to the first maximum resistance;
determining a second effective access length of the resistance block according to the first minimum resistance;
determining the difference between the first effective access length and the second effective length as a first lift of the valve;
the determining a second lift of the valve based on the second maximum resistance and the second minimum resistance includes:
determining a third effective access length of the resistance block according to the second maximum resistance;
determining a fourth effective access length of the resistance block according to the second minimum resistance;
determining a difference between the third effective engagement length and the fourth effective length as a second lift of the valve.
In some exemplary embodiments, the starting time of the first preset period is a starting operation time of an engine.
In a fifth aspect, an embodiment of the present application provides an engine including the valve clearance warning apparatus according to the first aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic illustration of an engine valve lash in the prior art;
fig. 2 is a schematic structural diagram of a valve clearance early warning device according to an embodiment of the present disclosure;
fig. 3 is a schematic application diagram of a door gap warning device according to an embodiment of the present disclosure;
FIG. 4 is a graphical illustration of resistance versus valve operating length versus time provided by an embodiment of the present application;
FIG. 5 is a schematic view of a valve recess configuration provided in an embodiment of the present application;
FIG. 6 is a flow chart of a valve lash warning method provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram of a valve clearance warning apparatus according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a valve clearance early warning device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
For convenience of understanding, terms referred to in the embodiments of the present application are explained below:
any number of elements in the drawings are by way of example and not by way of limitation, and any nomenclature is used solely for differentiation and not by way of limitation.
(1) Valve clearance: in cold assembly, the clearance between the valve and its transmission, as illustrated by the camshaft in fig. 1, is indicated by 11.
(2) An electronic control unit: an ECU (Electronic Control Unit) has the functions of operation and Control, and when the engine runs, it collects the signals of each sensor, performs operation, and converts the operation result into a Control signal to Control the operation of the controlled object.
In a specific practice process, the performance of the engine is affected when the valve clearance is too large or too small, for example, the exhaust gas of a combustion chamber is increased and the economic performance of the engine is changed when the valve clearance is too large; the valve clearance is too small, so that the power of the engine is reduced, and the oil consumption is increased.
Therefore, the application provides a valve clearance early warning device, this valve clearance early warning device includes ohmmeter, resistance block and electrically conductive gleitbretter, wherein: the conductive sliding sheet is fixed on the rod part of the air valve; the resistance block is fixed on a cylinder of the valve and is connected with the conductive slide sheet in a sliding manner so as to slide along with the movement of the valve; the resistance meter is connected with the resistance block and the conductive sliding sheet through a lead and used for measuring each resistance value when the resistance block slides, and the resistance value is used for early warning of the valve clearance.
After introducing the design concept of the embodiment of the present application, some simple descriptions are provided below for application scenarios to which the technical solution of the embodiment of the present application can be applied, and it should be noted that the application scenarios described below are only used for describing the embodiment of the present application and are not limited. In specific implementation, the technical scheme provided by the embodiment of the application can be flexibly applied according to actual needs.
Referring to fig. 1, which is a schematic diagram of an engine valve clearance provided in an embodiment of the present application, where 11 denotes a valve clearance, according to a technical solution of the embodiment of the present application, valve clearance early warning may be performed by measuring a resistance value of a resistance block in a valve clearance early warning device.
Of course, the method provided in the embodiment of the present application is not limited to be used in the application scenario shown in fig. 1, and may also be used in other possible application scenarios, and the embodiment of the present application is not limited. The functions that can be implemented by each device in the application scenario shown in fig. 1 will be described in the following method embodiments, and will not be described in detail herein.
To further illustrate the technical solutions provided by the embodiments of the present application, the following detailed description is made with reference to the accompanying drawings and the detailed description. Although the embodiments of the present application provide method steps as shown in the following embodiments or figures, more or fewer steps may be included in the method based on conventional or non-inventive efforts. In steps where no necessary causal relationship exists logically, the order of execution of the steps is not limited to that provided by the embodiments of the present application.
The following describes the technical solution provided in the embodiment of the present application with reference to the application scenario shown in fig. 1.
Referring to fig. 2, an embodiment of the present application provides a valve clearance early warning device, including a conductive sliding vane 21, a resistance block 22, and a resistance meter 23, where:
the conductive sliding sheet 21 is fixed on the rod part of the air valve;
the resistance block 22 is fixed on the cylinder cover of the valve and is connected with the conductive slide sheet 21 in a sliding way so as to slide along with the movement of the valve 24;
the resistance meter 23 is connected with the resistance block 22 and the conductive sliding piece 21 through conducting wires and is used for measuring various resistance values when the resistance block 22 slides, and the resistance values are used for valve clearance early warning.
In the embodiment of the application, the resistance meter, the resistance block and the conductive sliding sheet form a closed loop, the resistance block slides along with the movement of the valve, the effective length of the resistance block connected into the loop changes, and then the resistance value measured by the resistance meter changes, so that the valve running length can be determined according to the change of the resistance value, and then whether the valve clearance needs to be adjusted or not is determined according to the valve running length, and valve clearance early warning is carried out if the valve clearance needs to be adjusted. Therefore, valve clearance early warning is achieved according to the measured resistance value, and the running performance of the engine is improved.
The driving part moves to drive the valve to move, and the valve clearance formed between the valve and the driving part changes. In order to detect the change rule of the valve clearance and further determine whether early warning is needed or not, the valve clearance early warning device provided by the embodiment of the application is applied to realization.
In a specific example, fig. 3 shows an application schematic diagram of a valve clearance early warning device, referring to fig. 3, since the conductive sliding piece 21 is connected with the resistance block 22 in a sliding manner, when the valve 31 moves, the resistance block slides along with the movement of the valve 31, so that the effective length of the resistance block 22 connected to the loop changes, and the resistance value measured by the resistance meter 23 changes. And the change of the effective length of the resistance block 22 connected into the loop is the valve operation length. Therefore, whether the valve clearance needs to be adjusted or not can be judged through the valve running length, and if the valve clearance needs to be adjusted, valve clearance early warning is carried out.
Referring to FIG. 4, a graphical representation of resistance versus valve operating length over time is shown, wherein the dashed line 41 represents the change in resistance, the solid line 42 represents the change in valve operating length, and R represents0Representing the resistance, R, of the valve closed state before engine operationiIndicating the resistance value, L, of the valve in the open state after the engine has been operated0Indicating the valve operating length, L, of the valve in the closed state before the engine is operatediThe valve operating length in the valve open state after the engine operation is indicated, and i represents the measured ith data.
Illustratively, the valve rod is provided with a groove, and the first end of the conductive sliding piece is of a ring-shaped structure which is fixed at the groove of the valve rod. Thus, the ring-shaped structure of the sliding piece can rotate freely in the groove. Fig. 5 shows a schematic view of a valve recess arrangement, 51 showing the valve and 52 showing the annular recess arrangement on the valve.
In addition, the second end of the conductive sliding piece is of a buckle structure, so that the resistance block is connected with the conductive sliding piece through the buckle structure and slides in the buckle along with the movement of the air valve. In a specific example, the snap structure may be arranged in a fork shape to ensure good contact between the conductive slider and the resistor block. The schematic structural diagram is a top view, and it can be seen from fig. 2 that the resistive block is connected to the conductive slider in a fork-like manner, and slides in one end of the conductive slider in a fork-like manner.
In order to improve the early warning accuracy of the valve clearance, the resistance block is made of a material with good stability, and resistance change caused by temperature is corrected through a resistance correction coefficient.
The valve clearance early warning device further comprises a power supply 24, wherein the power supply 24 is connected to a closed loop formed by the conductive sliding piece 21, the resistance block 22 and the resistance meter 23 and used for providing power for the closed loop.
In addition, the valve lift can be calculated by directly replacing the valve material with the material for manufacturing the resistor without independently arranging the resistor block to form a closed loop and measuring the resistance change value. However, this requires special requirements for the material of the valve.
As shown in fig. 6, an embodiment of the present application further provides a valve clearance warning method, which is applied to the valve clearance warning device provided in the foregoing embodiment, and the method at least includes the following steps:
s601, acquiring a first maximum resistance value and a first minimum resistance value of a resistance block in the process from a closed state to an open state of a valve in a first preset time, and acquiring a second maximum resistance value and a second minimum resistance value of the resistance block in the process from the closed state to the open state of the valve in a second preset time, wherein the ending time of the first preset time is earlier than the starting time of the second preset time.
S602, determining a first lift of the valve according to the first maximum resistance and the first minimum resistance, and determining a second lift of the valve according to the second maximum resistance and the second minimum resistance.
And S603, if the difference between the first lift and the second lift exceeds a preset lift range, performing valve clearance early warning.
In the embodiment of the application, the lift ranges of the valve in the two preset durations are determined by determining the change of the resistance value of the valve from the closed state to the open state in the two preset durations without time crossing, and then whether the difference of the two lift ranges exceeds the preset lift range is judged, and if the difference exceeds the preset lift range, valve clearance early warning is carried out. Therefore, whether the valve clearance of the engine needs to be adjusted or not is judged in real time through valve clearance early warning, and therefore the running performance of the engine is improved.
Referring to step S601, an engine power is turned on, the engine operates, the valve starts to move, the valve is gradually opened from the closed state, a first preset time period is selected, for example, within 1 hour from the start of the engine to start the operation, within the 1 hour, the valve is turned from the closed state to the open state to the closed state, and in this cycle, the first maximum resistance value and the first minimum resistance value of the resistance block acquired within the first preset time period are determined. And selecting a second preset time length, and determining a second maximum resistance value and a second minimum resistance value of the resistance block in the circulating process of the valve from the closed state to the open state to the closed state in the second preset time length, wherein the second preset time length is not crossed with the first preset time length, namely the ending time of the first preset time length is earlier than the starting time of the first preset time length. In order to improve the accuracy of valve clearance early warning, the starting time of the first preset time is the starting operation time of the engine, so that the first preset time is a period of time for starting the engine to operate, and the accuracy rate of whether the valve clearance calculated by using the period of time needs early warning is high.
Referring to S602, the first lift and the second lift of the valve are determined by: determining a first effective access length of the resistance block according to the first maximum resistance; determining a second effective access length of the resistance block according to the first minimum resistance; and determining the difference between the first effective access length and the second effective length as the first lift of the valve. Determining a third effective access length of the resistance block according to the second maximum resistance; determining a fourth effective access length of the resistance block according to the second minimum resistance; and determining the difference between the third effective access length and the fourth effective access length as the second lift of the valve.
Specifically, the first maximum resistance is Rmax1The first minimum resistance is Rmin1The second maximum resistance is Rmax2The second minimum resistance is Rmin2(ii) a And calculating the effective access length of the resistance block according to a resistance law R ═ rho L/S, wherein rho is resistivity and is a constant related to the characteristics of the resistance block, and S is the cross-sectional area of the resistance block accessed into the loop. Therefore, the resistance values at different moments are substituted into a formula of the resistance law, and the corresponding effective access length is calculated. The first maximum resistance is Rmax1The corresponding first effective access length is Lmax1The first minimum resistance is Rmin1The corresponding second effective access length is Lmin1The second maximum resistance is Rmax2The corresponding third effective access length is Lmax2The second minimum resistance is Rmin2The corresponding fourth effective access length is Lmin2. Thus, the first lift Δ 1 is Lmax1-Lmin1Second lift Δ1＝Lmax2-Lmin2。
Referring to S603, the change C of the valve lift is determined, and the first lift Delta1And the second lift Δ2Making a difference to obtain C ═ delta1-△2The preset lift range is, for example, between a set value p and a set value q, for example p<C<q, showing that the difference between the first lift and the second lift is within a preset lift range, the valve clearance is normal and does not need to be adjusted; if C is less than or equal to p or C is greater than or equal to q, the first lift and the second lift exceed the preset lift range, and valve clearance early warning is carried out at the moment. For example, the warning manner may be voice and/or text prompt warning.
According to the embodiment, the sliding sheet is driven to slide along the resistance block through the valve movement, the length of the resistance block connected into the closed circuit is changed, the resistance values at different moments are measured, the valve lift at different moments is calculated according to the resistance law, and the valve lift variation is compared with the valve lift variation set after the valve lift variation is operated for a period of time in the initial state, so that whether the valve clearance needs to be adjusted or not can be predicted. The measuring mode is simple, and real-time prediction can be realized.
In addition, the embodiment of the application also provides an engine, which comprises the valve clearance early warning device in the embodiment, and is used for early warning the valve clearance of the engine.
Based on the same inventive concept as the valve clearance warning method, the embodiment of the present application further provides a valve clearance warning device, which may be specifically (a control device or a control system inside the engine, or an external device communicating with the engine) a desktop computer, a portable computer, a smart phone, a tablet computer, a Personal Digital Assistant (PDA), a server, or the like. As shown in fig. 7, the valve clearance warning apparatus may include an electronic control unit 701 and a memory 702.
The electronic control unit 701 may be a general-purpose electronic control unit, such as a Central Processing Unit (CPU), a Digital Signal electronic control unit (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present Application. The general electronic control unit may be a microelectronic control unit or any conventional electronic control unit or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware electronic control unit, or implemented by a combination of hardware and software modules in the electronic control unit.
Memory 702, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The Memory may include at least one type of storage medium, and may include, for example, a flash Memory, a hard disk, a multimedia card, a card-type Memory, a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Programmable Read Only Memory (PROM), a Read Only Memory (ROM), a charged Erasable Programmable Read Only Memory (EEPROM), a magnetic Memory, a magnetic disk, an optical disk, and so on. The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 702 in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.
Based on the same inventive concept as the valve clearance early warning method, the embodiment of the present application further provides a valve clearance early warning device, which is integrated in a valve clearance early warning apparatus, referring to fig. 8, and includes a resistance value obtaining module 81, a lift determining module 82, and an early warning module 83, wherein:
the resistance value obtaining module 81 is configured to obtain a first maximum resistance value and a first minimum resistance value of the resistance block in a process from a closed state to an open state of the valve within a first preset time period, and a second maximum resistance value and a second minimum resistance value of the resistance block in a process from the closed state to the open state of the valve within a second preset time period, where an end time of the first preset time period is earlier than a start time of the second preset time period;
a lift determination module 82 to determine a first lift of the valve based on the first maximum resistance and the first minimum resistance, and to determine a second lift of the valve based on the second maximum resistance and the second minimum resistance;
and the early warning module 83 is used for performing valve clearance early warning if the difference between the first lift and the second lift exceeds a preset lift range.
In the embodiment of the application, the lift ranges of the valve in the two preset durations are determined by determining the change of the resistance value of the valve from the closed state to the open state in the two preset durations without time crossing, and then whether the difference of the two lift ranges exceeds the preset lift range is judged, and if the difference exceeds the preset lift range, valve clearance early warning is carried out. Therefore, whether the valve clearance of the engine needs to be adjusted or not is judged in real time through valve clearance early warning, and therefore the running performance of the engine is improved.
In some exemplary embodiments, the lift determination module 82 is specifically configured to:
determining a first effective access length of the resistance block according to the first maximum resistance;
determining a second effective access length of the resistance block according to the first minimum resistance;
determining the difference between the first effective access length and the second effective length as a first lift of the valve;
determining a second lift of the valve based on the second maximum resistance and the second minimum resistance, comprising:
determining a third effective access length of the resistance block according to the second maximum resistance;
determining a fourth effective access length of the resistance block according to the second minimum resistance;
and determining the difference between the third effective access length and the fourth effective access length as the second lift of the valve.
In some exemplary embodiments, the starting time of the first preset period is a starting operation time of the engine.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; the computer storage media may be any available media or data storage device that can be accessed by a computer, including but not limited to: various media that can store program codes include a removable Memory device, a Random Access Memory (RAM), a magnetic Memory (e.g., a flexible disk, a hard disk, a magnetic tape, a magneto-optical disk (MO), etc.), an optical Memory (e.g., a CD, a DVD, a BD, an HVD, etc.), and a semiconductor Memory (e.g., a ROM, an EPROM, an EEPROM, a nonvolatile Memory (NAND FLASH), a Solid State Disk (SSD)).
Alternatively, the integrated units described above in the present application may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or portions thereof contributing to the prior art may be embodied in the form of a software product stored in a storage medium, and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media that can store program codes include a removable Memory device, a Random Access Memory (RAM), a magnetic Memory (e.g., a flexible disk, a hard disk, a magnetic tape, a magneto-optical disk (MO), etc.), an optical Memory (e.g., a CD, a DVD, a BD, an HVD, etc.), and a semiconductor Memory (e.g., a ROM, an EPROM, an EEPROM, a nonvolatile Memory (NAND FLASH), a Solid State Disk (SSD)).
The above embodiments are only used to describe the technical solutions of the present application in detail, but the above embodiments are only used to help understanding the method of the embodiments of the present application, and should not be construed as limiting the embodiments of the present application. Modifications and substitutions that may be readily apparent to those skilled in the art are intended to be included within the scope of the embodiments of the present application.

Claims (10)

1. The utility model provides a valve clearance early warning device which characterized in that, includes electrically conductive gleitbretter, resistance block and ohmmeter, wherein:
the conductive sliding sheet is fixed on the rod part of the air valve;
the resistance block is fixed on a cylinder cover of the valve and is connected with the conductive sliding sheet in a sliding mode so as to slide along with the movement of the valve;
the resistance meter is connected with the resistance block and the conductive sliding sheet through leads and used for measuring each resistance value when the resistance block slides, and the resistance value is used for valve clearance early warning.
2. The device of claim 1, wherein the stem of the valve is provided with a recess.
3. The apparatus of claim 2, wherein the first end of the conductive sliding piece is a ring structure, and the first end of the conductive sliding piece is fixed at a groove of the rod portion of the valve.
4. The device of claim 1, wherein the second end of the conductive slider is a snap structure, and the resistor block is connected to the conductive slider through the snap structure and slides in the snap structure along with the movement of the valve.
5. The apparatus of claim 1, further comprising a power source connected in a closed loop of the conductive slider, the resistor block, and the ohmmeter.
6. A valve clearance warning method applied to the valve clearance warning apparatus according to any one of claims 1 to 5, characterized by comprising:
acquiring a first maximum resistance value and a first minimum resistance value of the resistance block in the process of changing the valve from a closed state to an open state within a first preset time period, and a second maximum resistance value and a second minimum resistance value of the resistance block in the process of changing the valve from the closed state to the open state within a second preset time period, wherein the ending time of the first preset time period is earlier than the starting time of the second preset time period;
determining a first lift of the valve according to the first maximum resistance and the first minimum resistance, and determining a second lift of the valve according to the second maximum resistance and the second minimum resistance;
and if the difference between the first lift and the second lift exceeds a preset lift range, performing valve clearance early warning.
7. The method of claim 6, wherein said determining a first lift of said valve based on said first maximum resistance and said first minimum resistance comprises:
determining a first effective access length of the resistance block according to the first maximum resistance;
determining a second effective access length of the resistance block according to the first minimum resistance;
determining the difference between the first effective access length and the second effective length as a first lift of the valve;
the determining a second lift of the valve based on the second maximum resistance and the second minimum resistance includes:
determining a third effective access length of the resistance block according to the second maximum resistance;
determining a fourth effective access length of the resistance block according to the second minimum resistance;
determining a difference between the third effective engagement length and the fourth effective length as a second lift of the valve.
8. The method of claim 6, wherein the start of the first predetermined period is an initial operating time of the engine.
9. Valve play warning device comprising a memory, an electronic control unit and a computer program stored on the memory and executable on the electronic control unit, characterized in that the steps of the method according to any one of claims 6-8 are implemented when the computer program is executed by the electronic control unit.
10. An engine characterized by comprising a valve clearance warning device according to any one of claims 1 to 5.
CN202110794693.6A 2021-07-14 2021-07-14 Valve clearance early warning device, method, equipment and engine Active CN113587801B (en)

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