CN115306551A - Engine timing abnormity monitoring method and device, vehicle and storage medium - Google Patents
Engine timing abnormity monitoring method and device, vehicle and storage medium Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/081—Safety, indicating, or supervising devices relating to endless members
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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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- 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
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Abstract
The invention provides an engine timing abnormity monitoring method, an engine timing abnormity monitoring device, a vehicle and a storage medium. According to the embodiment of the invention, on the basis of not increasing the cost, the camshaft phase sensor and the crankshaft phase sensor of the engine are used, the secondary verification can be carried out on the design of the engine while the signal abnormality of the camshaft and the crankshaft is monitored, and the phase deviation of a timing system is monitored, so that the belt tooth jumping and the valve collision of a piston can be monitored, and the adverse effect on the engine caused by the overlarge timing deviation is avoided.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a device for monitoring engine timing abnormity, a vehicle and a storage medium.
Background
The engine timing generally refers to the valve timing, and the normal operation of the engine is ensured mainly by accurately controlling the opening and closing time of an intake valve and an exhaust valve according to the working sequence. The time for opening and closing the valve and the up-and-down operation of the piston need to have strict time control, which is an important factor for ensuring the operation of the engine.
Theoretically, in the intake stroke, when the piston moves from the top dead center to the bottom dead center, the intake valve is opened, and the exhaust valve is closed; in the exhaust stroke, when the piston moves from the bottom dead center to the top dead center, the intake valve closes and the exhaust valve opens. In order to ensure the sufficient air intake and complete air exhaust of the engine cylinder, the valve is required to have the largest passing capacity, so that the actual opening and closing of the air intake valve and the exhaust valve of the engine are not just at the upper dead point and the lower dead point of the piston, but are properly advanced and retarded. If the valve timing is abnormal, the engine is unstable in idling, weak in acceleration, engine shaking, power reduction and abnormal emission can be caused, and even serious consequences such as piston valve collision, piston scrapping, valve bending and crankshaft breakage can be caused.
Therefore, it is necessary to develop a method for monitoring engine timing abnormality to solve the problem that the prior art cannot prevent the engine abnormality caused by the timing abnormality.
Disclosure of Invention
In view of the above, embodiments of the present invention provide an engine timing abnormality monitoring method, apparatus, vehicle, and storage medium to overcome or at least partially solve the above problems.
In a first aspect of an embodiment of the present invention, there is provided an engine timing abnormality monitoring method, including:
acquiring a deviation angle of an engine crankshaft;
determining an angle deviation threshold according to the deviation angle of the engine crankshaft;
acquiring an average value of a plurality of timing tooth edge timing deviations of the engine camshaft signal panel;
and judging whether the engine has abnormal timing according to the angle deviation threshold value and the average value of the timing deviation.
Optionally, the obtaining a deviation angle of a crankshaft of the engine includes:
acquiring a first deviation angle of the angle change of the engine camshaft relative to the engine crankshaft;
acquiring a second deviation angle of the change of the crankshaft angle corresponding to the gear jumping of the engine timing belt;
and acquiring a third deviation angle of the crankshaft rotation corresponding to the collision moment of the engine piston and the valve.
Optionally, the obtaining a first deviation angle of the engine camshaft relative to the engine crankshaft angle variation includes:
determining a calibration value of the engine camshaft relative to the engine crankshaft phase information according to the engine mechanical connection design information;
measuring actual phase information of the engine camshaft and the engine crankshaft to obtain a measured value of the engine camshaft relative to the phase information of the engine crankshaft;
obtaining a phase deviation value of the engine camshaft relative to the engine crankshaft according to the calibration value of the phase information and the measured value of the phase information;
and acquiring the first deviation angle according to the phase deviation value.
Optionally, the obtaining the first deviation angle according to the phase deviation value includes:
judging whether the phase deviation value exceeds the phase tolerance range of the engine camshaft relative to the engine crankshaft;
if the phase deviation value exceeds the phase tolerance range, recording the phase deviation value;
if the phase deviation value does not exceed the phase tolerance range, recording a threshold value of the phase tolerance range;
obtaining the first deviation angle according to the recorded phase deviation value or the threshold value of the recorded phase tolerance range, wherein the first deviation angle comprises: an advance angle of the camshaft relative to the crankshaft, or a retard angle of the camshaft relative to the crankshaft.
Optionally, the obtaining a second deviation angle of the crankshaft angle variation corresponding to the engine timing belt tooth skip comprises:
acquiring the number of teeth of the jumping teeth of the engine timing belt;
according to a crank angle corresponding to one belt tooth of the engine timing belt, acquiring a second deviation angle of the change of the crank angle corresponding to the number of the jumping teeth of the engine timing belt, wherein the second deviation angle comprises: the crankshaft angle corresponding to the forward tooth jump of the belt, or the crankshaft angle corresponding to the backward tooth jump of the belt.
Optionally, the obtaining a third deviation angle of crankshaft rotation corresponding to a time when the engine piston collides with the valve includes:
acquiring phase information of the engine crankshaft corresponding to the collision moment of the engine piston and the valve;
according to the phase information of the engine crankshaft, acquiring a third deviation angle of the engine crankshaft corresponding to the phase information, wherein the third deviation angle comprises: and the engine intake valve is opened early and is collided with the valve, or the engine exhaust valve is closed late and is collided with the valve.
Optionally, said determining an angle deviation threshold based on a deviation angle of said engine crankshaft comprises:
determining a first deviation threshold according to an advance angle of the camshaft relative to the crankshaft, the crank angle corresponding to forward gear jumping of the belt and the crank angle corresponding to early valve collision of an intake valve of the engine; or
Determining a second deviation threshold according to a lag angle of the camshaft relative to the crankshaft, the crank angle corresponding to backward tooth jumping of the belt and the crank angle corresponding to when the engine exhaust valve is closed late and hits the valve;
judging whether the engine has abnormal timing according to the angle deviation threshold value and the average value of the timing deviation, comprising the following steps:
when the average timing deviation is greater than the second deviation threshold or less than the first deviation threshold, indicating that the engine is not in timing abnormality;
when the average value of the timing deviation is less than or equal to the second deviation threshold value or greater than or equal to the first deviation threshold value, indicating that the engine has a timing abnormality.
Optionally, the obtaining an average value of the timing deviations of the plurality of timing tooth edges of the engine camshaft signal disc comprises:
acquiring calibration values of phase data of a plurality of timing tooth edges of the engine camshaft signal panel;
obtaining measured values of phase data of a plurality of timing tooth edges of the engine camshaft signal panel;
and acquiring an average value of the edge timing deviations of a plurality of timing teeth of the engine camshaft signal panel according to the calibration values and the measurement values.
Optionally, the method further comprises:
controlling the engine to normally run or start in the absence of a timing abnormality of the engine;
under the condition that the timing abnormality exists in the engine, if the engine is in a starting stage, the engine is prohibited from being started, and if the engine is in an operating stage, torque is limited for the engine.
In a second aspect of the embodiments of the present invention, there is provided an engine timing abnormality monitoring apparatus, including:
the first acquisition module is used for acquiring the deviation angle of the crankshaft of the engine;
a determination module to determine an angle deviation threshold based on a deviation angle of the engine crankshaft;
the second acquisition module is used for acquiring the average value of the edge timing deviations of the plurality of timing teeth of the engine camshaft signal panel;
and the judging module is used for judging whether the engine has abnormal timing according to the angle deviation threshold value and the average value of the timing deviation.
In a third aspect of the embodiments of the invention, there is provided a vehicle including the engine timing abnormality monitoring apparatus as described above.
In a fourth aspect of the embodiments of the present invention, there is provided a readable storage medium, on which a computer program/instructions are stored, wherein the computer program/instructions, when executed by a processor, implement the method for monitoring engine timing abnormality according to the first aspect of the present embodiment.
The method provided by the embodiment of the invention comprises the following steps: firstly, acquiring a deviation angle of an engine crankshaft, then determining an angle deviation threshold value according to the deviation angle of the engine crankshaft, then acquiring an average value of a plurality of timing tooth edge timing deviations of an engine camshaft signal panel, and finally judging whether the engine has timing abnormality according to the angle deviation threshold value and the timing deviation average value. According to the embodiment of the invention, on the basis of not increasing the cost, the camshaft phase sensor and the crankshaft phase sensor which are arranged on the engine are used, the secondary verification can be carried out on the design of the engine while the signal abnormality of the camshaft and the crankshaft is monitored, and the phase deviation of a timing system is monitored, so that the belt tooth jumping and the valve collision of a piston can be monitored, and the adverse effect on the engine caused by the overlarge timing deviation can be avoided.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a flowchart illustrating steps in a method for monitoring engine timing anomalies, according to an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a plurality of transmission assembly connections of an engine provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a relationship between a crankshaft angle and an operating curve according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a method for determining an angle deviation threshold according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a relationship between a phase of a camshaft and a crankshaft angle according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of a method of determining an average of timing deviations provided by an embodiment of the present invention;
FIG. 7 is a schematic engine control flow chart provided by an embodiment of the present invention;
FIG. 8 is a schematic diagram of an engine timing anomaly monitoring system according to an embodiment of the present invention.
Description of reference numerals: 1. a camshaft timing pulley; 2. a tension pulley assembly; 3. a timing belt; 4. a crankshaft timing pulley; 5. a water pump belt wheel; 6. a fuel pump pulley.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in which embodiments of the invention are shown. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
An embodiment of the present invention provides an engine timing abnormality monitoring method, referring to fig. 1, where fig. 1 is a flowchart illustrating steps of the engine timing abnormality monitoring method according to the embodiment of the present invention, and as shown in fig. 1, the method includes:
step 100, acquiring a deviation angle of an engine crankshaft;
in the embodiment of the invention, the phase information of the camshaft and the crankshaft can be monitored in real time through the camshaft phase sensor and the crankshaft phase sensor of the engine, and meanwhile, the deviation angle of the crankshaft of the engine can be determined based on different reference objects.
Specifically, a first deviation angle of the angle change of the engine camshaft relative to the engine crankshaft is obtained;
acquiring a second deviation angle of the change of the crankshaft angle corresponding to the gear jumping of the engine timing belt;
and acquiring a third deviation angle of the crankshaft rotation corresponding to the collision moment of the engine piston and the valve.
It should be noted that, in the embodiment of the present invention, during the installation of the crankshaft, the crankshaft needs to be calibrated by 0 °, and therefore, based on the value of 0 ° calibrated to the crankshaft, the first deviation angle, the second deviation angle and the third deviation angle based on the change of the crankshaft angle in the embodiment of the present invention may be simultaneously positive angle values or simultaneously negative angle values.
200, determining an angle deviation threshold according to the deviation angle of the crankshaft of the engine;
in this step, after the deviation angle of the crankshaft of the engine is acquired, that is, after the first deviation angle, the second deviation angle, and the third deviation angle based on the change in the crankshaft angle are acquired, the angle deviation threshold value may be determined by comparing the magnitudes of the first deviation angle, the second deviation angle, and the third deviation angle.
In the embodiment of the present invention, as shown in fig. 4, a schematic diagram of a method for determining an angle deviation threshold according to the embodiment of the present invention is shown, when a first deviation angle, a second deviation angle, and a third deviation angle are simultaneously positive angle values, a minimum value of the first deviation angle, the second deviation angle, and the third deviation angle is selected as the first deviation threshold by comparison;
and when the first deviation angle, the second deviation angle and the third deviation angle are negative angle values at the same time, selecting the maximum value as a second deviation threshold value through comparison.
The angle deviation threshold value is guaranteed to be the strictest value among the first deviation angle, the second deviation angle and the third deviation angle all the time, so that whether the engine is abnormal or not can be monitored timely, and the condition that the engine is in failure due to abnormal timing can be effectively prevented.
In a specific embodiment of the present invention, the first deviation angle comprises: an advance angle of the camshaft relative to the crankshaft or a retard angle of the camshaft relative to the crankshaft, wherein the advance angle is a positive angle value and the retard angle is a negative angle value.
The second deviation angle includes: the timing belt is characterized by comprising a crankshaft angle corresponding to forward tooth jumping of the timing belt 3 or a crankshaft angle corresponding to backward tooth jumping of the timing belt 3, wherein the crankshaft angle corresponding to the forward tooth jumping of the timing belt 3 is a positive angle value, and the crankshaft angle corresponding to the backward tooth jumping of the timing belt 3 is a negative angle value.
The third deviation angle includes: the crank angle corresponding to the valve collision of the engine intake valve opened earlier or the valve collision of the engine exhaust valve closed later, the crank angle corresponding to the early opening of the engine intake valve and the valve collision is a positive angle value, and the crank angle corresponding to the late closing of the engine exhaust valve and the valve collision is a negative angle value.
Therefore, in the embodiment of the present invention, the angle deviation threshold is determined according to the deviation angle of the crankshaft of the engine, specifically, the minimum value of the angle deviation threshold may be selected as the first deviation threshold according to the advance angle of the camshaft relative to the crankshaft, the crank angle corresponding to the forward tooth skipping of the timing belt, and the crank angle corresponding to the early valve-bumping of the intake valve of the engine;
or selecting the maximum value of the lag angle of the camshaft relative to the crankshaft, the crank angle corresponding to backward tooth jumping of the timing belt 3 and the crank angle corresponding to late closing of the engine exhaust valve and valve collision as a second deviation threshold value.
Step 300, obtaining an average value of a plurality of timing tooth edge timing deviations of the engine camshaft signal panel;
in the embodiment of the present invention, before obtaining the average value of the timing deviations of the edges of the multiple timing teeth on the signal panel of the engine camshaft, it is necessary to determine the multiple timing teeth on the signal panel of the engine camshaft as monitoring teeth of the signal panel, monitor the edges of the multiple monitoring teeth on the signal panel of the camshaft through a camshaft phase sensor, obtain measured values of phase data of the edges of the multiple timing teeth on the signal panel of the engine camshaft, determine actual angle values corresponding to the multiple measured values according to the correspondence between the measured values of the phase data of the edges of the multiple timing teeth and the angle of rotation of the crankshaft, compare theoretical angle values corresponding to the theoretical calibration values of the phase data of the edges of the multiple timing teeth on the signal panel of the camshaft with the actual angle values corresponding to the multiple measured values, obtain multiple deviation angle values, take the average value of the multiple deviation angle values, and use the obtained average value of the multiple deviation angle values as the average value of the timing deviations.
In a specific embodiment of the present invention, as shown in fig. 5, a schematic diagram of a camshaft phase and crankshaft angle correspondence is shown, and a three-tooth camshaft is taken as an example.
Firstly, 3 timing teeth on a signal panel of a three-tooth camshaft are required to be used as monitoring teeth, then any four monitoring tooth edges of the 3 monitoring teeth are determined, namely edge 0, edge 1, edge 2 and edge 3, the measured values of phase data of the corresponding edge 0, edge 1, edge 2, edge 3,4 monitoring tooth edges on the three-tooth camshaft signal panel are monitored through a camshaft phase sensor along with the rotation of the camshaft driven by a crankshaft, then actual angle values corresponding to the measured values of the phase data of the edge 0, edge 1, edge 2, edge 3,4 monitoring tooth edges in the measured edges are determined according to the corresponding relation of the phase data of the camshaft and the angle of rotation of the crankshaft, and theoretical angle values corresponding to the theoretical values of the phase data of the edge 0, edge 1, edge 2, edge 3,4 monitoring tooth edges in the calibrated edges are calculated at the same time. In order to increase the fault tolerance, in the crank angle waveform diagram, the second falling edge after the target tooth missing is taken as a reference, the falling edge of the twentieth tooth after the reference is taken as 0 °, crank angles corresponding to any one of the edges 0, 1, 2 and 3 of the measured edge and the calibrated edge can be respectively obtained according to fig. 5, and deviation angle values corresponding to the edges 0, 1, 2 and 3 of the calibrated edge and the measured edge are respectively calculated and obtained and are respectively C0, C1, C2 and C3.
In this step, a schematic diagram of a method of determining the average value of the timing deviation is shown in FIG. 6.
After deviation angle values C0, C1, C2, and C3 are obtained, an average value of deviation angle values C0, C1, C2, and C3 is taken as a timing deviation average value.
And step 400, judging whether the engine has abnormal timing according to the angle deviation threshold value and the average value of the timing deviation.
In the embodiment of the invention, when the average value of the timing deviation is greater than the second deviation threshold value or less than the first deviation threshold value, it indicates that the engine has no timing abnormality;
when the average value of the timing deviation is less than or equal to the second deviation threshold value or greater than or equal to the first deviation threshold value, the engine is indicated to have the timing abnormality. At the moment, an instrument panel engine fault lamp is lightened, and a fault code is displayed at the same time to remind a driver that the engine is abnormal in timing and needs to be checked immediately.
In yet another possible embodiment of the present invention, the engine may be controlled accordingly based on monitoring of engine timing anomalies to ensure proper engine use.
As shown in fig. 7, a schematic control flow chart of an engine according to an embodiment of the present invention may specifically be that when there is no timing abnormality in the engine, that is, when a mean value of timing deviation is greater than a second deviation threshold or smaller than a first deviation threshold, if the engine is in a start stage, the engine is controlled to start normally; and if the engine is in the operation stage, controlling the engine to continue normal operation.
When the engine has timing abnormality, namely the mean value of timing deviation is less than or equal to the second deviation threshold value or more than or equal to the first deviation threshold value, if the engine is in a starting stage, the engine is forbidden to start, and if the engine is in a running stage, the engine is limited in torsion, so that the severe condition that the valve collides with the piston due to large torque can be avoided, the occurrence of belt tooth jumping can be effectively avoided, the harm to the engine and a driver is reduced, and the driver can be ensured to move ahead slowly.
Meanwhile, the instrument displays a fault code to remind a driver of abnormal timing of the engine and please check the engine in time.
In an embodiment of the present invention, step 100, the obtaining the deviation angle of the crankshaft of the engine specifically includes:
step 101, acquiring a first deviation angle of the angle change of the engine camshaft relative to the engine crankshaft;
FIG. 2 shows a schematic diagram of a plurality of transmission assembly connections of an engine provided by an embodiment of the invention, and as shown in FIG. 2, a plurality of transmission assemblies exist between a camshaft and a crankshaft, and the transmission assemblies comprise: the timing control device comprises a camshaft timing belt wheel 1, a tension wheel assembly 2, a timing belt 3, a crankshaft timing belt wheel 4, a water pump belt wheel 5 and a fuel pump belt wheel 6, wherein the assembly tolerance of at least one or more transmission components in the plurality of transmission components is determined through engine mechanical connection design information, and a calibration value of phase information of the camshaft relative to a crankshaft is calculated according to the assembly tolerance; then, a measured value of the phase information of one or more of the plurality of transmission assemblies is obtained through measurement, and a difference value between the measured value of the phase information and a calibration value is determined as a phase deviation value.
The phase tolerance range of the engine camshaft relative to the engine crankshaft can be determined according to the engine mechanical connection design information, and then whether the phase deviation value exceeds the phase tolerance range or not is judged.
If the phase deviation value exceeds the phase tolerance range, recording the phase deviation value;
and if the phase deviation value does not exceed the phase tolerance range, recording a threshold value of the phase tolerance range. And obtaining the first deviation angle according to the recorded phase deviation value or the recorded threshold value of the phase tolerance range.
In this embodiment, the first deviation angle includes: an advance angle of the camshaft relative to the crankshaft or a retard angle of the camshaft relative to the crankshaft, wherein the advance angle is a positive angle value and the retard angle is a negative angle value.
And 102, acquiring a second deviation angle of the crankshaft angle change corresponding to the tooth skipping of the engine timing belt 3.
In the embodiment of the invention, whether the timing belt 3 jumps teeth or not can be monitored through a phase sensor of a camshaft and/or a crankshaft, the number of teeth jumping at the moment is analyzed, and a crankshaft angle corresponding to one belt tooth of the engine timing belt 3 is obtained through calculation, so that a second deviation angle of the crankshaft angle change corresponding to the number of teeth jumping at the moment of the timing belt 3 can be obtained.
In this embodiment, the second deviation angle includes: the crank angle corresponding to the forward tooth jump of the timing belt 3 or the crank angle corresponding to the backward tooth jump of the timing belt 3, wherein, the crank angle corresponding to the forward tooth jumping of the timing belt 3 is a positive angle value, and the crank angle corresponding to the backward tooth jumping of the timing belt 3 is a negative angle value.
And 103, acquiring a third deviation angle of crankshaft rotation corresponding to the collision time of the engine piston and the valve.
Fig. 3 is a schematic diagram illustrating a relationship between a crankshaft angle and an operation curve according to an embodiment of the present invention.
It can be seen from the figure that the point where the piston operation curve is parallel to the intake valve operation curve is the critical point where the top dead center of the piston operation is closest to the intake valve, and the point where the piston operation curve is parallel to the exhaust valve operation curve is the critical point where the top dead center of the piston operation is closest to the exhaust valve, so that when the intake valve operation curve is translated to be tangent to the piston operation curve, the moment is the moment when the intake valve opens the piston early to hit the valve, and the crank angle corresponding to the moment can be obtained from the figure, the crank angle is the third deviation angle, or when the exhaust valve operation curve is translated to be tangent to the piston operation curve, the moment when the exhaust valve closes the piston late to hit the valve can be obtained from the figure, and the crank angle corresponding to the moment can be obtained from the figure, and the crank angle is the third deviation angle. In this embodiment, the crank angle corresponding to the early opening of the intake valve of the engine when the intake valve hits the valve is a positive angle value, and the crank angle corresponding to the late closing of the exhaust valve of the engine when the exhaust valve hits the valve is a negative angle value.
As shown in fig. 8, an embodiment of the present invention further provides a device for monitoring an engine timing abnormality, including:
the first acquisition module is used for acquiring the deviation angle of the crankshaft of the engine;
a determination module to determine an angle deviation threshold based on a deviation angle of the engine crankshaft;
the second acquisition module is used for acquiring the average value of the edge timing deviations of the plurality of timing teeth of the engine camshaft signal panel;
and the judging module is used for judging whether the engine has abnormal timing according to the angle deviation threshold value and the average value of the timing deviation.
In the system, the deviation angle of the crankshaft of the engine is obtained through a first obtaining module, an angle deviation threshold value is determined through a determining module, then the average value of the timing deviation of a plurality of timing tooth edges of a camshaft signal panel of the engine is obtained through a second obtaining module, and finally a monitoring module is utilized to judge whether the engine has abnormal timing according to the angle deviation threshold value and the average value of the timing deviation.
The first obtaining module includes:
the first obtaining submodule is used for obtaining a first deviation angle of the angle change of the engine camshaft relative to the engine crankshaft;
the second obtaining submodule is used for obtaining a second deviation angle of the crankshaft angle change corresponding to the gear jumping of the engine timing belt;
and the third acquisition submodule is used for acquiring a third deviation angle of the crankshaft rotation corresponding to the collision moment of the engine piston and the valve.
The determining module includes:
the first determining submodule is used for determining a first deviation threshold value according to an advance angle of the camshaft relative to the crankshaft, the crank angle corresponding to forward tooth jumping of the belt and the crank angle corresponding to early opening of the engine intake valve and bumping of the engine intake valve;
and the second determining submodule is used for determining a second deviation threshold according to the lag angle of the camshaft relative to the crankshaft, the crank angle corresponding to backward skip teeth of the belt and the crank angle corresponding to the time when the exhaust valve of the engine is closed late and hits the valve.
The discrimination module includes:
the first judgment submodule is used for indicating that the engine has no abnormal timing when the average value of the timing deviation is larger than the second deviation threshold or smaller than the first deviation threshold;
and the second judging submodule is used for indicating that the engine has abnormal timing when the average value of the timing deviation is less than or equal to the second deviation threshold or greater than or equal to the first deviation threshold.
The first discrimination submodule includes:
a first control subunit, configured to control the engine to run normally or start up in a case where there is no timing abnormality in the engine;
the second judging sub-module includes:
and the second control subunit is used for forbidding the engine to be started if the engine is in a starting stage and limiting the torque of the engine if the engine is in an operating stage under the condition that the timing abnormality exists in the engine.
The embodiment of the invention also provides a vehicle which comprises the engine timing abnormity monitoring device.
The vehicle and the engine timing abnormity monitoring method and device have the same advantages compared with the prior art, and are not described again.
Embodiments of the present invention also provide a computer readable storage medium having stored thereon a computer program/instructions which, when executed by a processor, implement the method for monitoring engine timing anomalies as disclosed in embodiments of the present invention.
By adopting the technical scheme of the invention, the deviation angle of the engine crankshaft is obtained, the angle deviation threshold is determined according to the deviation angle of the engine crankshaft, the average value of the edge timing deviation of a plurality of timing teeth of the engine camshaft signal panel is obtained, and finally, whether the engine has timing abnormality or not is judged according to the angle deviation threshold and the average value of the timing deviation.
According to the embodiment of the invention, on the basis of not increasing the cost, the camshaft phase sensor and the crankshaft phase sensor of the engine are used, the secondary verification can be carried out on the design of the engine while the signal abnormality of the camshaft and the crankshaft is monitored, and the phase deviation of a timing system is monitored, so that the belt tooth jumping and the valve collision of a piston can be monitored, and the adverse effect on the engine caused by the overlarge timing deviation is avoided.
The embodiments in the present specification are all described in a progressive manner, and each embodiment focuses on differences from other embodiments, and portions that are the same and similar between the embodiments may be referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising one of \ 8230; \8230;" does not exclude the presence of additional like elements in a process, method, article, or terminal device that comprises the element.
The engine timing anomaly monitoring method, the engine timing anomaly monitoring device, the vehicle and the storage medium are described in detail, specific examples are applied to the description to explain the principle and the implementation mode of the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (12)
1. An engine timing anomaly monitoring method, characterized by comprising:
acquiring a deviation angle of an engine crankshaft;
determining an angle deviation threshold according to the deviation angle of the engine crankshaft;
acquiring an average value of a plurality of timing tooth edge timing deviations of the engine camshaft signal panel;
and judging whether the engine has abnormal timing according to the angle deviation threshold value and the average value of the timing deviation.
2. The engine timing abnormality monitoring method according to claim 1, wherein said obtaining a deviation angle of an engine crankshaft, includes:
acquiring a first deviation angle of the angle change of the engine camshaft relative to the engine crankshaft;
acquiring a second deviation angle of the crankshaft angle change corresponding to the gear jumping of the engine timing belt;
and acquiring a third deviation angle of the crankshaft rotation corresponding to the collision moment of the engine piston and the valve.
3. The engine timing abnormality monitoring method according to claim 2, wherein said obtaining a first deviation angle of the engine camshaft with respect to the engine crankshaft angle variation includes:
determining a calibration value of the engine camshaft relative to the engine crankshaft phase information according to the engine mechanical connection design information;
measuring actual phase information of the engine camshaft and the engine crankshaft to obtain a measured value of the engine camshaft relative to the phase information of the engine crankshaft;
obtaining a phase deviation value of the engine camshaft relative to the engine crankshaft according to the calibration value of the phase information and the measured value of the phase information;
and acquiring the first deviation angle according to the phase deviation value.
4. The engine abnormal timing monitoring method according to claim 3, wherein said obtaining the first deviation angle based on the phase deviation value includes:
judging whether the phase deviation value exceeds the phase tolerance range of the engine camshaft relative to the engine crankshaft;
if the phase deviation value exceeds the phase tolerance range, recording the phase deviation value;
if the phase deviation value does not exceed the phase tolerance range, recording a threshold value of the phase tolerance range;
obtaining the first deviation angle according to the recorded phase deviation value or the threshold value of the recorded phase tolerance range, wherein the first deviation angle comprises: an advance angle of the camshaft relative to the crankshaft, or a retard angle of the camshaft relative to the crankshaft.
5. The engine timing abnormality monitoring method according to claim 4, wherein said obtaining a second deviation angle of the change in the crank angle corresponding to the skip of the engine timing belt includes:
acquiring the number of tooth jumping of the engine timing belt;
according to a crank angle corresponding to one belt tooth of the engine timing belt, acquiring a second deviation angle of the change of the crank angle corresponding to the tooth number of the skip tooth of the engine timing belt, wherein the second deviation angle comprises: the crankshaft angle corresponding to the forward tooth jump of the belt, or the crankshaft angle corresponding to the backward tooth jump of the belt.
6. The engine timing abnormality monitoring method according to claim 5, wherein said obtaining a third deviation angle of rotation of a crankshaft corresponding to a time at which an engine piston collides with a valve includes:
acquiring phase information of the engine crankshaft corresponding to the collision moment of the engine piston and the valve;
according to the phase information of the engine crankshaft, acquiring a third deviation angle of the engine crankshaft corresponding to the phase information, wherein the third deviation angle comprises: and the engine intake valve is opened early and is collided with the valve, or the engine exhaust valve is closed late and is collided with the valve.
7. The engine timing abnormality monitoring method according to claim 6, wherein said determining an angular deviation threshold value based on a deviation angle of said engine crankshaft includes:
determining a first deviation threshold according to an advance angle of the camshaft relative to the crankshaft, the crank angle corresponding to forward gear jumping of the belt and the crank angle corresponding to early valve collision of an intake valve of the engine; or
Determining a second deviation threshold according to a lag angle of the camshaft relative to the crankshaft, the crank angle corresponding to backward tooth jumping of the belt and the crank angle corresponding to when the engine exhaust valve is closed late and hits the valve;
judging whether the engine has abnormal timing according to the angle deviation threshold value and the average value of the timing deviation, comprising the following steps:
when the average value of the timing deviation is greater than the second deviation threshold or less than the first deviation threshold, indicating that the engine has no timing abnormality;
when the average value of the timing deviation is less than or equal to the second deviation threshold value or greater than or equal to the first deviation threshold value, indicating that the engine has a timing abnormality.
8. The engine timing anomaly monitoring method according to claim 1, wherein said obtaining an average of a plurality of timing tooth edge timing deviations of said engine camshaft signal disc comprises:
acquiring calibration values of phase data of a plurality of timing tooth edges of the engine camshaft signal panel;
obtaining measured values of phase data of a plurality of timing tooth edges of the engine camshaft signal panel;
and acquiring an average value of the edge timing deviations of a plurality of timing teeth of the engine camshaft signal panel according to the calibration values and the measurement values.
9. The engine timing abnormality monitoring method according to any one of claims 1-8, characterized in that said method further includes:
controlling the engine to normally run or start in the absence of a timing abnormality of the engine;
under the condition that the engine has timing abnormality, if the engine is in a starting stage, the engine is prohibited from being started, and if the engine is in an operating stage, the engine is limited in torque.
10. An engine timing abnormality monitoring device, characterized by comprising:
the first acquisition module is used for acquiring the deviation angle of the crankshaft of the engine;
a determination module to determine an angle deviation threshold based on a deviation angle of the engine crankshaft;
the second acquisition module is used for acquiring the average value of the edge timing deviations of the plurality of timing teeth of the engine camshaft signal panel;
and the judging module is used for judging whether the engine has abnormal timing according to the angle deviation threshold value and the average value of the timing deviation.
11. A vehicle characterized by comprising the engine timing abnormality monitoring apparatus according to claim 10.
12. A computer readable storage medium having stored thereon a computer program/instructions, which when executed by a processor, implement a method of engine timing anomaly monitoring as claimed in any one of claims 1 to 9.
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| CN115306551B (en) | 2024-05-28 |
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