CN115306551B - Engine timing abnormality monitoring method and device, vehicle and storage medium - Google Patents
Engine timing abnormality monitoring method and device, vehicle and storage medium Download PDFInfo
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- CN115306551B CN115306551B CN202210968304.1A CN202210968304A CN115306551B CN 115306551 B CN115306551 B CN 115306551B CN 202210968304 A CN202210968304 A CN 202210968304A CN 115306551 B CN115306551 B CN 115306551B
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- 230000002159 abnormal effect Effects 0.000 claims description 9
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- 238000004590 computer program Methods 0.000 claims description 4
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Classifications
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention provides an engine timing abnormality monitoring method, device, vehicle and storage medium, firstly, obtaining a deviation angle of an engine crankshaft, then determining an angle deviation threshold according to the deviation angle of the engine crankshaft, secondly, obtaining an average value of timing deviations of edges of a plurality of timing teeth of a cam shaft signal panel of the engine, and finally, judging whether the engine has timing abnormality according to the angle deviation threshold and the timing deviation average value. According to the embodiment of the invention, on the basis of not increasing the cost, the design of the engine can be secondarily checked and the phase deviation of the timing system can be monitored while the signal abnormality of the camshaft and the crankshaft is monitored through the camshaft phase sensor and the crankshaft phase sensor of the engine, so that the belt tooth jump and the piston valve collision can be monitored, and the adverse effect on the engine caused by overlarge timing deviation is avoided.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine timing abnormality monitoring method, an engine timing abnormality monitoring device, a vehicle and a storage medium.
Background
The engine timing is generally air timing, and the normal operation of the engine is ensured by accurately controlling the opening and closing time of the intake valve and the exhaust valve according to the working sequence. The time for opening and closing the valve and the up-and-down operation of the piston are strictly controlled, and are important factors 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 is closed and the exhaust valve is opened. In order to ensure sufficient intake and exhaust of the engine cylinder, the valve is required to have a throughput capacity as large as possible, so that the actual opening and closing of the intake and exhaust valves of the engine are not exactly at the top and bottom dead centers of the piston, but are suitably advanced and retarded. If abnormal valve timing occurs, the engine can be unstable in idling, weak in acceleration, shaky in engine, low in power and abnormal in emission, and even the piston valve can collide, so that serious consequences such as piston rejection, 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 engine abnormality caused by the timing abnormality cannot be prevented in the prior art.
Disclosure of Invention
In view of the foregoing, embodiments of the present invention provide an engine timing anomaly monitoring method, apparatus, vehicle, and storage medium to overcome or at least partially solve the foregoing problems.
In a first aspect of an embodiment of the present invention, there is provided a method for monitoring engine timing abnormality, including:
obtaining 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 timing deviation of a plurality of timing teeth of the engine camshaft signal panel;
And judging whether the engine has timing abnormality or not according to the angle deviation threshold value and the timing deviation average value.
Optionally, the acquiring the deviation angle of the engine crankshaft includes:
Acquiring a first deviation angle of the engine camshaft relative to the engine crankshaft angle change;
Acquiring a second deviation angle of the crankshaft angle change corresponding to the engine timing belt tooth jump;
And acquiring a third deviation angle of the rotation of the crankshaft, corresponding to the collision time of the engine piston and the valve.
Optionally, the acquiring a first deviation angle of the engine camshaft relative to the engine crankshaft angle change 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 phase information 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, obtaining a phase deviation value of the engine camshaft relative to the engine crankshaft;
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;
acquiring 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 acquiring the second deviation angle of the crankshaft angle change corresponding to the engine timing belt tooth jump includes:
acquiring the number of teeth of the engine timing belt jump teeth;
According to the crank angle corresponding to one belt tooth of the engine timing belt, obtaining a second deviation angle of crank angle change corresponding to the number of teeth of the jump tooth of the engine timing belt, wherein the second deviation angle comprises: the crank angle corresponding to the forward jump teeth of the belt, or the crank angle corresponding to the backward jump teeth of the belt.
Optionally, the acquiring a third deviation angle of the rotation of the crankshaft corresponding to the collision time of the engine piston and the valve includes:
Acquiring phase information of the engine crankshaft corresponding to collision time of the engine piston and the valve;
According to the phase information of the engine crankshaft, a third deviation angle of the engine crankshaft corresponding to the phase information is obtained, and the third deviation angle comprises: and the crank angle corresponding to the early opening of the engine intake valve when the valve is knocked or the crank angle corresponding to the late closing of the engine exhaust valve when the valve is knocked.
Optionally, the determining an angle deviation threshold according to the deviation angle of the 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 jump teeth of the belt and the crank angle corresponding to early opening of an intake valve of the engine; or (b)
Determining a second deviation threshold according to a lag angle of the camshaft relative to the crankshaft, the crank angle corresponding to backward jump teeth of the belt, and the crank angle corresponding to late closing of the engine exhaust valve;
judging whether the engine has timing abnormality according to the angle deviation threshold value and the timing deviation average value, comprising the following steps:
when the timing deviation average value is greater than the second deviation threshold value or less than the first deviation threshold value, indicating that the engine has no timing abnormality;
And when the timing deviation average value is smaller than or equal to the second deviation threshold value or larger than or equal to the first deviation threshold value, indicating that the engine has timing abnormality.
Optionally, the obtaining an average value of the plurality of timing tooth edge timing deviations of the engine camshaft signal disc includes:
acquiring calibration values of phase data of a plurality of timing tooth edges of the engine camshaft signal panel;
acquiring measured values of phase data of a plurality of timing tooth edges of the engine camshaft signal panel;
And obtaining an average value of the edge timing deviations of the 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 run normally or start under the condition that the engine has no timing abnormality;
And under the condition that the engine has abnormal timing, prohibiting the engine from starting if the engine is in a starting stage, and limiting the torque of the engine if the engine is in an operating stage.
In a second aspect of an embodiment of the present invention, there is provided an engine timing abnormality monitoring device including:
the first acquisition module is used for acquiring the deviation angle of the engine crankshaft;
the determining module is used for determining an angle deviation threshold according to the deviation angle of the engine crankshaft;
The second acquisition module is used for acquiring an average value of a plurality of timing tooth edge timing deviations of the engine camshaft signal panel;
And the judging module is used for judging whether the engine has timing abnormality or not according to the angle deviation threshold value and the timing deviation average value.
In a third aspect of the embodiments of the present invention, there is provided a vehicle including the engine timing abnormality monitoring device as described above.
In a fourth aspect of an embodiment of the present invention, there is provided a readable storage medium having stored thereon a computer program/instruction, wherein the computer program/instruction when executed by a processor implements the method for engine timing anomaly monitoring 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 according to the deviation angle of the engine crankshaft, then acquiring an average value of timing deviation of a plurality of timing teeth of an engine camshaft signal panel, and finally judging whether the engine has timing abnormality according to the angle deviation threshold and the timing deviation average value. According to the embodiment of the invention, on the basis of not increasing the cost, the design of the engine can be secondarily checked and the phase deviation of the timing system can be monitored while the signal abnormality of the camshaft and the crankshaft is monitored through the camshaft phase sensor and the crankshaft phase sensor of the engine, so that the belt tooth jump and the piston valve collision can be monitored, and the adverse effect on the engine caused by overlarge timing deviation is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of steps of a method for monitoring engine timing anomalies provided by an embodiment of the present invention;
FIG. 2 is a schematic illustration of a plurality of transmission assembly connections for an engine according to an embodiment of the present invention;
FIG. 3 is a graph showing a relationship between crank angle and operation curve according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a method for determining an angular deviation threshold according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a phase-to-crank angle correspondence of a camshaft according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a method for determining a timing offset average according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an engine control flow provided by an embodiment of the present invention;
fig. 8 is a schematic diagram of an engine timing abnormality monitoring system according to an embodiment of the present invention.
Reference numerals illustrate: 1. a camshaft timing pulley; 2. a tensioning wheel 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 the embodiments of the present invention. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present 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.
The embodiment of the invention provides an engine timing abnormality monitoring method, referring to fig. 1, fig. 1 is a step flowchart of the engine timing abnormality monitoring method provided by the embodiment of the invention, as shown in fig. 1, the method comprises the following steps:
Step 100, obtaining 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 engine camshaft relative to the engine crankshaft angle change is obtained;
Acquiring a second deviation angle of the crankshaft angle change corresponding to the engine timing belt tooth jump;
And acquiring a third deviation angle of the rotation of the crankshaft, corresponding to the collision time of the engine piston and the valve.
It should be noted that, in the specific embodiment of the present invention, during the installation process of the crankshaft, the crankshaft needs to be calibrated by 0 ° and therefore, based on the value of 0 ° calibrated for the crankshaft, the first deviation angle, the second deviation angle and the third deviation angle based on the change of the crankshaft angle according to the embodiments of the present invention may be both positive angle values or both negative angle values.
Step 200, determining an angle deviation threshold according to the deviation angle of the engine crankshaft;
In this step, after the deviation angle of the engine crankshaft is obtained, 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 obtained, 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, and when a first deviation angle, a second deviation angle and a third deviation angle are positive angle values at the same time, a minimum value 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 simultaneously negative angle values, selecting the maximum value of the first deviation angle, the second deviation angle and the third deviation angle as a second deviation threshold value through comparison.
The angle deviation threshold value is always the strictest value among the first deviation angle, the second deviation angle and the third deviation angle, so that whether the engine is abnormal or not can be timely monitored, and the occurrence of the condition of engine faults caused by timing abnormality can be effectively prevented.
In a specific embodiment of the present invention, 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.
The second deviation angle includes: the crank angle corresponding to the forward jump teeth of the timing belt 3 or the crank angle corresponding to the backward jump teeth of the timing belt 3, wherein the crank angle corresponding to the forward jump teeth of the timing belt 3 is a positive angle value, and the crank angle corresponding to the backward jump teeth of the timing belt 3 is a negative angle value.
The third deviation angle includes: the method comprises the steps of enabling an engine intake valve to be opened early and collide with a valve or enabling an engine exhaust valve to be closed late and collide with a valve, wherein the corresponding crank angle is a positive angle value when the engine intake valve is opened early and collides with the valve, and the corresponding crank angle is a negative angle value when the engine exhaust valve is closed late and collides with the valve.
Therefore, in the embodiment of the present invention, the angle deviation threshold may be determined according to a deviation angle of the engine crankshaft, and specifically, the minimum value of the angle deviation threshold may be selected as a first deviation threshold according to an advance angle of the camshaft relative to the crankshaft, the crank angle corresponding to the forward jump of the timing belt, and the crank angle corresponding to the early opening of the valve by the intake valve of the engine;
Or selecting the maximum value of the angle of the cam shaft relative to the crank shaft, the crank angle corresponding to backward jump teeth of the timing belt 3 and the crank angle corresponding to the late closing of the engine exhaust valve 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 invention, before the average value of the timing deviation of the edges of a plurality of timing teeth of the engine camshaft signal panel is obtained, a plurality of timing teeth on the engine camshaft signal panel are required to be determined to be used as monitoring teeth of the signal panel, the edges of a plurality of monitoring teeth on the camshaft signal panel are monitored through a camshaft phase sensor to obtain the measured value of the phase data of the edges of the plurality of timing teeth on the engine camshaft signal panel, the measured value of the phase data of the edges of the plurality of timing teeth is determined according to the corresponding relation between the phase data of the camshaft and the rotation angle of the crankshaft, the actual angle value corresponding to the measured value is determined, then the theoretical angle value corresponding to the theoretical calibration value of the phase data of the edges of the plurality of timing teeth on the camshaft signal panel is compared with the actual angle value corresponding to the measured value, a plurality of deviation angle values are obtained, the average value of the deviation angle values is taken, and the obtained average value of the deviation angle values is taken as the average value of the timing deviation.
In a specific embodiment of the present invention, as shown in fig. 5, a schematic diagram of the correspondence relationship between the phase of the camshaft and the angle of the crankshaft is shown, and a three-tooth camshaft is specifically taken as an example.
Firstly, 3 timing teeth on a signal panel of a three-tooth cam shaft are required to be used as monitoring teeth, then any four monitoring tooth edges of the 3 monitoring teeth are determined to be respectively edge 0, edge 1, edge 2 and edge 3, as the cam shaft drives the cam shaft to rotate, the measured values of the phase data of the corresponding edge 0, edge 1, edge 2 and edge 3 and 4 monitoring tooth edges on the three-tooth cam shaft signal panel are monitored through a cam shaft phase sensor, then according to the corresponding relation between the phase data of the cam shaft and the rotation angle of the cam shaft, the actual angle values corresponding to the measured values of the phase data of the edge 0, edge 1, edge 2 and edge 3 and 4 monitoring tooth edges in the measuring edges are determined, and meanwhile, the theoretical angle values corresponding to the theoretical values of the phase data of the edge 0, edge 1, edge 2 and edge 3 and 4 monitoring tooth edges in the calibrating edges are calculated. In the crank angle waveform diagram, in order to increase the fault tolerance, the corresponding relation between the cam shaft phase data and the crank angle is shown in fig. 5, the falling edge of the twentieth tooth after the target tooth defect is taken as 0 ° based on the second falling edge after the target tooth defect, the crank angles corresponding to any one of the edges 0,1,2 and 3 of the measuring edge and the calibrating edge can be obtained according to fig. 5, and the deviation angle values corresponding to the edges 0,1,2 and 3 of the calibrating edge and the measuring edge are calculated and obtained respectively, and are C0, C1, C2 and C3.
In this step, a method for determining the average value of the timing deviation is schematically shown in fig. 6.
After the deviation angle values C0, C1, C2, C3 are obtained, the average value of the deviation angle values C0, C1, C2, C3 is taken as the timing deviation average value.
And 400, judging whether the engine has timing abnormality or not 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 larger than the second deviation threshold value or smaller than the first deviation threshold value, the engine is indicated to have no timing abnormality;
And when the average value of the timing deviation is smaller than or equal to the second deviation threshold value or larger than or equal to the first deviation threshold value, indicating that the engine has timing abnormality. At this time, the instrument panel engine fault lamp is turned on, and meanwhile, a fault code is displayed to remind a driver that the engine has abnormal timing, and the engine 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 use of the engine.
As shown in fig. 7, a schematic diagram of an engine control flow provided by an embodiment of the present invention may specifically be that when there is no abnormal timing of an engine, that is, when an average value of timing deviation is greater than a second deviation threshold value or less than a first deviation threshold value, if the engine is in a starting stage, the engine is controlled to start normally; and if the engine is in the operation stage, controlling the engine to continue to normally operate.
When the engine has timing abnormality, namely when the average value of the timing deviation is smaller than or equal to a second deviation threshold value or larger than or equal to a first deviation threshold value, if the engine is in a starting stage, starting of the engine is forbidden, and if the engine is in a running stage, the engine is limited, so that severe conditions of valve collision with a piston caused by large torque can be avoided, belt tooth jump can be effectively avoided, damage to the engine and a driver is reduced, and the driver can be guaranteed to move forward at a retarded speed.
Meanwhile, the instrument displays a fault code to remind a driver of abnormal timing of the engine, and the engine is checked in time.
In one embodiment of the present invention, step 100, obtaining a deviation angle of an engine crankshaft specifically includes:
step 101, obtaining a first deviation angle of the engine camshaft relative to the engine crankshaft angle change;
FIG. 2 is a schematic diagram of connection of multiple transmission assemblies of an engine according to an embodiment of the present invention, where, as shown in FIG. 2, there are multiple transmission assemblies from a camshaft to a crankshaft, including: the method comprises the steps of determining assembly tolerance of at least one or more transmission components of a plurality of transmission components through engine mechanical connection design information, and calculating to obtain a calibration value of phase information of a camshaft relative to a crankshaft according to the assembly tolerance, wherein the camshaft timing belt wheel 1, the tensioning wheel assembly 2, the timing belt 3, the crankshaft timing belt wheel 4, the water pump belt wheel 5 and the fuel pump belt wheel 6; then, a measured value of the phase information of one or more of the plurality of transmission assemblies is obtained by measurement, and a difference between the measured value of the phase information and the 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 from the engine mechanical connection design information, and then, whether the phase deviation value exceeds the phase tolerance range 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 threshold value of the recorded 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.
Step 102, obtaining a second deviation angle of the crankshaft angle change corresponding to the jump tooth 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 the phase sensor of the cam shaft and/or the cam shaft, the tooth number of the jump teeth at the moment is analyzed, and the crank angle corresponding to one belt tooth of the engine timing belt 3 is obtained through calculation, so that the second deviation angle of the crank angle change corresponding to the tooth number of the jump teeth of the timing belt 3 at the moment can be obtained.
In this embodiment, the second deviation angle includes: the crank angle corresponding to the forward jump teeth of the timing belt 3 or the crank angle corresponding to the backward jump teeth of the timing belt 3, wherein the crank angle corresponding to the forward jump teeth of the timing belt 3 is a positive angle value, and the crank angle corresponding to the backward jump teeth of the timing belt 3 is a negative angle value.
Step 103, obtaining a third deviation angle of the rotation of the crankshaft corresponding to the collision time of the engine piston and the valve.
Fig. 3 is a schematic diagram showing a relationship between crank angle and 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 when the intake valve operation curve is translated to be tangential to the piston operation curve, this moment is the moment when the intake valve is opened earlier and the piston hits the valve, and the crank angle corresponding to this moment can be obtained from the figure, and this crank angle is the third deviation angle, or when the exhaust valve operation curve is translated to be tangential to the piston operation curve, this moment is the moment when the exhaust valve is closed later and the piston hits the valve, and from the figure the crank angle corresponding to this moment is obtained. In this embodiment, the crank angle corresponding to the early opening of the valve of the engine is a positive angle, and the crank angle corresponding to the late closing of the valve of the engine is a negative angle.
As shown in fig. 8, an embodiment of the present invention further provides a device for monitoring engine timing abnormality, including:
the first acquisition module is used for acquiring the deviation angle of the engine crankshaft;
the determining module is used for determining an angle deviation threshold according to the deviation angle of the engine crankshaft;
The second acquisition module is used for acquiring an average value of a plurality of timing tooth edge timing deviations of the engine camshaft signal panel;
And the judging module is used for judging whether the engine has timing abnormality or not according to the angle deviation threshold value and the average value of the timing deviation.
In the system provided by the embodiment of the invention, the deviation angle of the engine crankshaft is obtained through the first obtaining module, the angle deviation threshold value is determined through the determining module, then the average value of the timing deviations of the edges of a plurality of timing teeth of the engine camshaft signal panel is obtained through the second obtaining module, and finally whether the engine has timing abnormality is judged according to the angle deviation threshold value and the average value of the timing deviations by the monitoring module.
The first acquisition module includes:
The first acquisition submodule is used for acquiring a first deviation angle of the engine camshaft relative to the engine crankshaft angle change;
The second acquisition submodule is used for acquiring a second deviation angle of the crankshaft angle change corresponding to the engine timing belt tooth jump;
and the third acquisition submodule is used for acquiring a third deviation angle of the rotation of the crankshaft, which corresponds to the collision time of the engine piston and the valve.
The determining module includes:
The first determining submodule is used for determining a first deviation threshold 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 valve opening and valve collision 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 tooth jump of the belt and the crank angle corresponding to the late closing of the exhaust valve of the engine.
The discriminating module includes:
The first judging sub-module is used for indicating that the engine has no timing abnormality when the timing deviation average value is larger than the second deviation threshold value or smaller than the first deviation threshold value;
And the second judging sub-module is used for indicating that the engine has timing abnormality when the timing deviation average value is smaller than or equal to the second deviation threshold value or larger than or equal to the first deviation threshold value.
The first judging sub-module comprises:
A first control subunit, configured to control the engine to run or start normally when there is no timing abnormality in the engine;
The second discrimination submodule includes:
And the second control subunit is used for prohibiting the engine from starting if the engine is in a starting stage and limiting the engine if the engine is in an operating stage when the engine has abnormal timing.
The embodiment of the invention also provides a vehicle which comprises the engine timing abnormality monitoring device.
The vehicle has the same advantages as the engine timing abnormality monitoring method and device compared with the prior art, and the vehicle is not described in detail herein.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program/instruction is stored, which when executed by a processor, implements the method for monitoring engine timing anomalies as disclosed in the embodiment of the invention.
According to the technical scheme, the deviation angle of the engine crankshaft is obtained, then the angle deviation threshold value is determined according to the deviation angle of the engine crankshaft, then the average value of the timing deviation of the edges of the plurality of timing teeth of the engine camshaft signal panel is obtained, and finally whether the engine has timing abnormality is judged 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 design of the engine can be secondarily checked and the phase deviation of the timing system can be monitored while the signal abnormality of the camshaft and the crankshaft is monitored through the camshaft phase sensor and the crankshaft phase sensor of the engine, so that the belt tooth jump and the piston valve collision can be monitored, and the adverse effect on the engine caused by overlarge timing deviation is avoided.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are 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. Moreover, 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 phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element.
The method, the device, the vehicle and the storage medium for monitoring engine timing abnormality provided by the invention are described in detail, and specific examples are applied to illustrate the principle and the implementation mode of the invention, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (11)
1. A method for monitoring engine timing anomalies, the method comprising:
Obtaining a deviation angle of an engine crankshaft; the deviation angle comprises a first deviation angle of an engine camshaft relative to the change of the engine crankshaft angle, a second deviation angle of the change of the crankshaft angle corresponding to the jump tooth of the engine timing belt, and a third deviation angle of the rotation of the crankshaft corresponding to the collision time of the engine piston and the valve;
Determining an angle deviation threshold according to the deviation angle of the engine crankshaft; wherein the angular deviation threshold comprises a first deviation threshold and a second deviation threshold; when the first deviation angle, the second deviation angle and the third deviation angle are all positive angle values, the first deviation threshold is the minimum value of the first deviation angle, the second deviation angle and the third deviation angle; when the first deviation angle, the second deviation angle and the third deviation angle are all negative angle values, the second deviation threshold value is the maximum value of the first deviation angle, the second deviation angle and the third deviation angle;
acquiring an average value of timing deviation of a plurality of timing teeth of the engine camshaft signal panel;
And judging whether the engine has timing abnormality or not according to the angle deviation threshold value and the timing deviation average value.
2. The engine timing anomaly monitoring method of claim 1, wherein the obtaining the deviation angle of the engine crankshaft comprises:
Acquiring the first deviation angle;
acquiring the second deviation angle;
acquiring the third deviation angle;
the obtaining the first deviation angle 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 phase information 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, obtaining a phase deviation value of the engine camshaft relative to the engine crankshaft;
And acquiring the first deviation angle according to the phase deviation value.
3. The engine timing abnormality monitoring method according to claim 2, characterized in that said obtaining the first deviation angle from 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;
acquiring 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.
4. The engine timing anomaly monitoring method of claim 3, wherein the obtaining the second deviation angle comprises:
acquiring the number of teeth of the engine timing belt jump teeth;
According to the crank angle corresponding to one belt tooth of the engine timing belt, obtaining a second deviation angle of crank angle change corresponding to the number of teeth of the jump tooth of the engine timing belt, wherein the second deviation angle comprises: the crank angle corresponding to the forward jump teeth of the belt, or the crank angle corresponding to the backward jump teeth of the belt.
5. The engine timing abnormality monitoring method according to claim 4, characterized in that said obtaining the third deviation angle includes:
Acquiring phase information of the engine crankshaft corresponding to collision time of the engine piston and the valve;
According to the phase information of the engine crankshaft, a third deviation angle of the engine crankshaft corresponding to the phase information is obtained, and the third deviation angle comprises: and the crank angle corresponding to the early opening of the engine intake valve when the valve is knocked or the crank angle corresponding to the late closing of the engine exhaust valve when the valve is knocked.
6. The engine timing anomaly monitoring method of claim 5, wherein the determining an angular deviation threshold based on the deviation angle of the engine crankshaft comprises:
determining the first deviation threshold according to an advance angle of the camshaft relative to the crankshaft, the crank angle corresponding to the forward jump teeth of the belt and the crank angle corresponding to the early opening of the valve of the engine inlet valve; or (b)
Determining the second deviation threshold according to a lag angle of the camshaft relative to the crankshaft, the crank angle corresponding to the backward jump teeth of the belt, and the crank angle corresponding to the late closing of the engine exhaust valve;
judging whether the engine has timing abnormality according to the angle deviation threshold value and the timing deviation average value, comprising the following steps:
when the timing deviation average value is greater than the second deviation threshold value or less than the first deviation threshold value, indicating that the engine has no timing abnormality;
And when the timing deviation average value is smaller than or equal to the second deviation threshold value or larger than or equal to the first deviation threshold value, indicating that the engine has timing abnormality.
7. The engine timing anomaly monitoring method of claim 1, wherein the obtaining an average of a plurality of timing tooth edge timing deviations 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;
acquiring measured values of phase data of a plurality of timing tooth edges of the engine camshaft signal panel;
And obtaining an average value of the edge timing deviations of the plurality of timing teeth of the engine camshaft signal panel according to the calibration values and the measurement values.
8. The engine timing abnormality monitoring method according to any one of claims 1 to 7, characterized in that the method further comprises:
controlling the engine to run normally or start under the condition that the engine has no timing abnormality;
And under the condition that the engine has abnormal timing, prohibiting the engine from starting if the engine is in a starting stage, and limiting the torque of the engine if the engine is in an operating stage.
9. An engine timing abnormality monitoring device, characterized by comprising:
The first acquisition module is used for acquiring the deviation angle of the engine crankshaft; the deviation angle comprises a first deviation angle of an engine camshaft relative to the change of the engine crankshaft angle, a second deviation angle of the change of the crankshaft angle corresponding to the jump tooth of the engine timing belt, and a third deviation angle of the rotation of the crankshaft corresponding to the collision time of the engine piston and the valve;
The determining module is used for determining an angle deviation threshold according to the deviation angle of the engine crankshaft; wherein the angular deviation threshold comprises a first deviation threshold and a second deviation threshold; when the first deviation angle, the second deviation angle and the third deviation angle are all positive angle values, the first deviation threshold is the minimum value of the first deviation angle, the second deviation angle and the third deviation angle; when the first deviation angle, the second deviation angle and the third deviation angle are all negative angle values, the second deviation threshold value is the maximum value of the first deviation angle, the second deviation angle and the third deviation angle;
The second acquisition module is used for acquiring an average value of a plurality of timing tooth edge timing deviations of the engine camshaft signal panel;
And the judging module is used for judging whether the engine has timing abnormality or not according to the angle deviation threshold value and the timing deviation average value.
10. A vehicle characterized in that it includes the engine timing abnormality monitoring device according to claim 9.
11. A computer readable storage medium having stored thereon a computer program or instructions which when executed by a processor implements the method of engine timing anomaly monitoring as claimed in any one of claims 1 to 8.
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