CN110836143B - Method and system for judging variable valve lift switching - Google Patents
Method and system for judging variable valve lift switching Download PDFInfo
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- CN110836143B CN110836143B CN201810934655.4A CN201810934655A CN110836143B CN 110836143 B CN110836143 B CN 110836143B CN 201810934655 A CN201810934655 A CN 201810934655A CN 110836143 B CN110836143 B CN 110836143B
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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
- F02B77/082—Safety, indicating or supervising devices relating to valves
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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
- F02B77/083—Safety, indicating or supervising devices relating to maintenance, e.g. diagnostic device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
Abstract
The invention discloses a method for judging variable valve lift switching, which comprises the following steps: acquiring the current position of an execution pin group in the variable valve lift mechanism, wherein the execution pin group consists of an execution pin A and an execution pin B; judging whether the current position is the same as the target position; if not, respectively judging the switching process of the execution pin A and the execution pin B; when a command that the switching of the execution pins a and B is successful is detected, the switching process of the variable valve lift mechanism is completed. The method judges the switching process of the variable valve lift, detects whether a fault occurs, and solves the problems that the variable valve lift mechanism is easy to have faults due to frequent cam line type switching, and a method for judging the variable valve lift switching is lacked and is used for carrying out fault diagnosis on the switching process of the variable valve lift mechanism.
Description
Technical Field
The invention relates to the technical field of automobile diagnosis, in particular to a method and a system for judging variable valve lift switching.
Background
The valve lift of the traditional gasoline engine is fixed and invariable, namely, only one cam profile of the camshaft is available, and the engine cannot respond well in a high-speed region and a low-speed region. In order to enable the engine to obtain good response in a high-speed area and a low-speed area, a discrete variable valve lift mechanism is designed, and the discrete variable valve lift mechanism can select one of several cam profiles according to the load working condition of the operation of the engine, so that the pumping loss of the engine is reduced, and the combustion in a cylinder is improved.
However, the variable valve lift mechanism is prone to failure due to frequent switching of the cam line type, and a method for determining variable valve lift switching is lacking, which is used for diagnosing failure of the switching process of the variable valve lift mechanism.
Disclosure of Invention
In view of this, the present invention provides a method and a system for determining switching of a variable valve lift, so as to solve the problem that a failure easily occurs due to frequent switching of a cam line type of a variable valve lift mechanism, and perform a failure diagnosis on a switching process of the variable valve lift mechanism, and the specific scheme is as follows:
a method for determining variable valve lift switching includes:
acquiring the current position of an execution pin group in the variable valve lift mechanism, wherein the execution pin group consists of an execution pin A and an execution pin B;
judging whether the current position is the same as the target position;
if not, respectively judging the switching process of the execution pin A and the execution pin B;
when a command for successful switching of the execution pin a or the execution pin B is detected, the switching process of the variable valve lift mechanism is completed.
The above method, optionally, further includes:
if yes, judging whether a first voltage fed back by a position sensor of the execution pin group is a first target voltage or not, wherein the first state refers to that the execution pin A is at an initial position and the execution pin B is at an initial position;
and if not, determining that the switching process of the variable valve lift mechanism is faulty.
Optionally, the determining the switching process of the execution pin a and the execution pin B respectively includes:
for an execution pin A, after a driving signal of an execution pin group lasts for a first duration, if a second voltage fed back by a position sensor of the execution pin group is greater than a second target voltage and the driving is stopped continuously until the driving signal stops driving, judging that the cam line type switching process of the execution pin A is reasonable;
and for the execution pin B, after the driving signal of the execution pin group lasts for a second time, if the third voltage fed back by the position sensor of the execution pin group is less than a third target voltage and the driving of the driving signal is continuously stopped, judging that the cam line type switching process of the execution pin B is reasonable.
The above method, optionally, further includes:
if the cam line type switching process of the execution pin A is unreasonable, judging whether the execution pin A is broken through self-checking;
if not, continuing self-checking, and judging whether the execution pin A is broken or not through self-checking;
if not, the problem of unknown rationality is judged.
The above method, optionally, further includes:
if the cam line type switching process of the execution pin B is unreasonable, judging whether the execution pin B is broken through self-checking;
if not, continuing self-checking, and judging whether the execution pin B is broken through self-checking;
if not, the problem of unknown rationality is judged.
The above method, optionally, further includes:
counting the times of occurrence of the unknown rationality problem;
and when the frequency of the position reasonability problem reaches a preset threshold value, reporting a reasonability fault.
A variable valve lift switching determination system, comprising:
the variable valve lift mechanism comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the current position of an execution pin group in the variable valve lift mechanism, and the execution pin group consists of an execution pin A and an execution pin B;
the first judgment module is used for judging whether the current position is the same as the target position or not;
the second judgment module is used for respectively judging the switching process of the execution pin A and the execution pin B if the execution pin A and the execution pin B are not in the switching process;
a completion module for completing a switching process of the variable valve lift mechanism when a command for successful switching of the execution pin a or the execution pin B is detected.
In the foregoing system, optionally, the second determining module includes:
the first judging unit is used for judging that the cam line type switching process of the execution pin A is reasonable when a second voltage fed back by a position sensor of the execution pin group is greater than a second target voltage and continues to stop driving until a driving signal continues to drive after a driving signal of the execution pin group continues for a first duration for the execution pin A;
and the second judging unit is used for judging that the cam line type switching process of the execution pin B is reasonable when the third voltage fed back by the position sensor of the execution pin group is less than a third target voltage and the driving signal is continuously stopped after the driving signal of the execution pin group continues for a second time period aiming at the execution pin B.
The above system, optionally, further includes:
a third judging unit, which judges whether the actuating pin A is broken or not through self-checking if the cam line type switching process of the actuating pin A is unreasonable;
a fourth judging unit, configured to continue self-checking if the execution pin a is broken, and judge whether the execution pin a is broken through self-checking;
and the first judgment unit is used for judging that the rationality problem is unknown if the rationality problem is not known.
The above system, optionally, further includes:
the fifth judging unit is used for judging whether the actuating pin B is broken or not through self-checking if the cam line type switching process of the actuating pin B is unreasonable;
a sixth judging unit, configured to continue self-checking if the execution pin B is broken, and judge whether the execution pin B is broken through self-checking;
and the second judgment unit is used for judging that the rationality problem is unknown if the rationality problem is not judged.
Compared with the prior art, the invention has the following advantages:
the invention discloses a method for judging variable valve lift switching, which comprises the following steps: acquiring the current position of an execution pin group in the variable valve lift mechanism, wherein the execution pin group consists of an execution pin A and an execution pin B; judging whether the current position is the same as the target position; if not, respectively judging the switching process of the execution pin A and the execution pin B; when a command that the switching of the execution pins a and B is successful is detected, the switching process of the variable valve lift mechanism is completed. The method judges the switching process of the variable valve lift, detects whether a fault occurs, and solves the problems that the variable valve lift mechanism is easy to have faults due to frequent cam line type switching, and a method for judging the variable valve lift switching is lacked and is used for carrying out fault diagnosis on the switching process of the variable valve lift mechanism.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart of a method for determining switching of variable valve lift according to an embodiment of the present disclosure;
FIG. 2 is a flowchart of another method for determining switching of variable valve lift according to an embodiment of the present disclosure;
FIG. 3 is a flowchart of another method for determining switching of variable valve lift according to an embodiment of the present disclosure;
FIG. 4 is a schematic illustration of a method of controlling an engine disclosed in an embodiment of the present application;
fig. 5 is a block diagram of a structure of a system for determining variable valve lift switching according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The invention discloses a method for judging variable valve lift switching, which is applied to the technical field of automobile diagnosis, realizes the switching of corresponding cam line types by an execution pin A and an execution pin B, ensures that an engine can obtain good response in a high-speed area and a low-speed area, reduces the pumping loss of the engine, improves the combustion in a cylinder, can be a processor or a controller as an execution main body of the judging method, is applied to an engine control system, and has the execution flow shown in figure 1, and comprises the following steps:
s101, acquiring the current position of an execution pin group in the variable valve lift mechanism, wherein the execution pin group consists of an execution pin A and an execution pin B;
in the embodiment of the invention, the current situation of acquiring the execution pin group according to the electromagnetic valve execution pin position sensor is that the execution pin group is composed of an execution pin A and an execution pin B, wherein the execution pin A and the execution pin B correspond to one of a large cam profile or a small cam profile.
S102, judging whether the current position is the same as the target position;
in the embodiment of the invention, the acquired current position is compared with the target position, and whether the current position is the same as the target position is judged. Wherein the target position is the execution pin A at the initial position and the execution pin B at the initial position; the actuation pin A is in an open position and the actuation pin B is in one of an initial position and the actuation pin A is in an initial position and the actuation pin B is in an open position.
S103, if not, respectively judging the switching process of the execution pin A and the execution pin B;
in the embodiment of the present invention, if the current position is different from the target position, that is, the cam line type has a switching requirement and the driving signal of the execution pin group is in a driving state, the switching process of the execution pin a and the execution pin B is respectively determined.
And S104, when a command that the execution pin A or the execution pin B is successfully switched is detected, the switching process of the variable valve lift mechanism is completed.
In the embodiment of the present invention, when a command that one of the execution pin a and the execution pin B is successfully switched is detected, it indicates that the current switching process of the variable valve lift mechanism is completed.
Preferably, the three target positions respectively correspond to a first target voltage, a second target voltage and a third target voltage, and specific values are shown in table 1:
| position of the actuating pin A | Position of actuating pin B | Target voltage |
| Initial position | Initial position | 2.3-2.7V (first target voltage) |
| Open position | Initial position | 3.3-4.7V (second target voltage) |
| Initial position | Open position | 0.3-1.7V (third target voltage) |
TABLE 1
The invention discloses a method for judging variable valve lift switching, which comprises the following steps: acquiring the current position of an execution pin group in the variable valve lift mechanism, wherein the execution pin group consists of an execution pin A and an execution pin B; judging whether the current position is the same as the target position; if not, respectively judging the switching process of the execution pin A and the execution pin B; when a command that the switching of the execution pins a and B is successful is detected, the switching process of the variable valve lift mechanism is completed. The method judges the switching process of the variable valve lift at this time to detect whether the fault occurs, and solves the problems that the variable valve lift mechanism is easy to generate the fault due to frequent cam line type switching, and a method for judging the variable valve lift switching is lacked and is used for carrying out fault diagnosis on the switching process of the variable valve lift mechanism.
In the embodiment of the present invention, if the current position is the same as the target position, the method is as shown in fig. 2, and includes the steps of:
s201, judging whether a first voltage fed back by a position sensor of the executive pin group is a first target voltage or not, wherein the first state refers to that the executive pin A is at an initial position and the executive pin B is at an initial position;
in the embodiment of the invention, when the current position of the execution pin group is the same as the target position, the cam line type switching request is not generated, and whether the first voltage fed back by the position sensor of the execution pin group is the first target voltage or not is judged in real time.
And S202, if not, determining that the switching process of the variable valve lift mechanism is faulty.
In the embodiment of the invention, if yes, the switching process of the variable valve lift mechanism is judged to have no fault. If not, determining that the switching process of the variable valve lift mechanism is faulty, and operating the engine in a corresponding aftertreatment mode.
In the embodiment of the present invention, the flow of the method for determining the switching process between the execution pin a and the execution pin B is shown in fig. 3, and the method includes the steps of:
s301, for the execution pin A, after the driving signal of the execution pin group lasts for a first time period, if the second voltage fed back by the position sensor of the execution pin group is greater than a second target voltage and the driving is stopped until the driving signal continues, it is determined that the cam line type switching process of the execution pin A is reasonable.
In the embodiment of the present invention, if the current position is different from the target position, that is, the cam profile has a switching requirement and the driving signal of the execution pin group is in a driving state, for the execution pin a, after the start duration of the driving signal reaches a first duration, if a second voltage signal fed back by a position sensor of the execution pin group is greater than a second target voltage and is continuously maintained until the driving signal of the execution pin group stops driving, it is determined that the switching of the cam profile of the execution pin a is completed, and it is determined that no fault exists, otherwise, it is determined that the switching is unreasonable;
if the switching process of the execution pin A is unreasonable, triggering a self-check, namely forcibly switching once according to the current actual lift after a certain time: the execution of the pin driving to the target position is once for a large lift if the current lift is large, and once for a small lift if the current lift is small. And after triggering the self-test, starting driving to finishing driving of the execution pin A from a driving signal of the execution pin group, if a feedback voltage signal of a position sensor of the execution pin group is greater than the second target voltage and lasts for a certain time, judging that the execution pin A is broken, judging that the execution pin A is faulty, and operating the engine in a corresponding post-processing mode.
And if the first self-checking process does not judge that a certain bolt is broken, waiting for triggering the second self-checking. The second self-checking logic is consistent with the first self-checking: and forcibly switching according to the current lift range, and judging the state of the A/B bolt position feedback voltage signal. If after the secondary self-checking, pin breakage is not judged yet, the counter of the unknown rationality problem is increased by one, the counter of the unknown rationality problem is larger than a certain value, a rationality fault is reported, and the engine runs in a corresponding post-processing mode.
In the embodiment of the present invention, preferably, if the execution pin a is not determined to be broken in the primary self-test process, the triggering of the secondary self-test is waited. And the second self-checking logic is consistent with the previous self-checking logic, the switching is forced according to the current lift, and the feedback voltage signal state of the position sensor of the execution pin group is judged. And if the pin A of the execution pin is not judged to be broken after the secondary self-inspection, adding one to the counter of the unknown rationality problem.
S302, after the driving signal of the execution pin group continues for a second time period, if the third voltage fed back by the position sensor of the execution pin group is smaller than a third target voltage and the driving of the driving signal is continuously stopped, the cam line type switching process of the execution pin B is judged to be reasonable.
In the embodiment of the present invention, if the current position is different from the target position, that is, the cam profile has a switching requirement and the driving signal of the execution pin group is in a driving state, for the execution pin B, after the start duration of the driving signal reaches the second duration, if the third voltage signal fed back by the position sensor of the execution pin group is less than the third target voltage and is continuously maintained until the driving signal of the execution pin group is disconnected for driving, it is determined that the switching of the cam profile of the execution pin B is completed, and it is determined that there is no fault, otherwise it is determined that the switching is not reasonable
If the switching process of the execution pin A is unreasonable, triggering a self-check, namely forcibly switching once according to the current actual lift after a certain time: the execution of the pin driving to the target position is once for a large lift if the current lift is large, and once for a small lift if the current lift is small. And after the self-test is triggered, for the execution pin B, starting to drive from the drive signal of the execution pin group to finish driving, if the feedback voltage signal of the execution pin position sensor is less than the third target voltage and lasts for a certain time, judging that the execution pin B is broken, judging that the execution pin B is faulty, and operating the engine in a corresponding post-processing mode.
In the embodiment of the present invention, preferably, if the execution pin B is not determined to be broken in the primary self-test process, the triggering of the secondary self-test is waited. And the second self-checking logic is consistent with the previous self-checking logic, the switching is forced according to the current lift, and the feedback voltage signal state of the position sensor of the execution pin group is judged. And if the execution pin B is not judged to be broken after the secondary self-inspection, adding one to the counter of the unknown rationality problem.
In the embodiment of the invention, specifically, whether the cam profile corresponding to the actuating pin a or the cam profile corresponding to the actuating pin B is switched is determined according to the working condition of the engine, and a specific control process is schematically shown in fig. 4.
In the embodiment of the invention, preferably, the times of the occurrence of the unknown rationality problem are counted, and when the times of the occurrence of the position rationality problem reach a preset threshold value, a rationality fault is reported, and the engine runs in a corresponding post-processing mode.
In an embodiment of the present invention, based on the above method for determining variable valve lift switching, a system for determining variable valve lift switching is further provided, and a block diagram of the determining system is shown in fig. 5, where the system includes:
an obtaining module 401, a first judging module 402, a second judging module 403 and a completing module 404.
Wherein the content of the first and second substances,
the obtaining module 401 is configured to obtain a current position of an execution pin group in the variable valve lift mechanism, where the execution pin group is composed of an execution pin a and an execution pin B;
the first determining module 402 is configured to determine whether the current position is the same as the target position;
the second determining module 403 is configured to determine, if not, the switching processes of the execution pin a and the execution pin B respectively;
the complete module 404 is configured to complete the switching process of the variable valve lift mechanism when a command that the switching of the execution pin a or the execution pin B is successful is detected.
The invention discloses a system for judging variable valve lift switching, which comprises: acquiring the current position of an execution pin group in the variable valve lift mechanism, wherein the execution pin group consists of an execution pin A and an execution pin B; judging whether the current position is the same as the target position; if not, respectively judging the switching process of the execution pin A and the execution pin B; when a command that the switching of the execution pins a and B is successful is detected, the switching process of the variable valve lift mechanism is completed. The system judges the switching process of the variable valve lift and detects whether a fault occurs, thereby solving the problems that the variable valve lift mechanism is easy to have faults due to frequent cam line type switching, and a method for judging the variable valve lift switching is lacked and is used for carrying out fault diagnosis on the switching process of the variable valve lift mechanism.
In this embodiment of the present invention, the second determining module 403 includes:
a first judgment unit 405 and a second judgment unit 406.
Wherein the content of the first and second substances,
the first determining unit 405 is configured to determine, for the execution pin a, that a cam line type switching process of the execution pin a is reasonable if a second voltage fed back by a position sensor of the execution pin group is greater than a second target voltage and continues until the driving signal stops driving after a driving signal of the execution pin group continues for a first duration.
The second determining unit 406 is configured to determine, for the execution pin B, that the cam line type switching process of the execution pin B is reasonable if the third voltage fed back by the position sensor of the execution pin group is smaller than the third target voltage and the driving of the execution pin B is continuously stopped by the driving signal after the driving signal of the execution pin group continues for the second duration.
In this embodiment of the present invention, the second determining module 403 further includes:
a third judging unit 407, a fourth judging unit 408 and a first judging unit 409.
Wherein the content of the first and second substances,
the third judging unit 407 judges whether the actuating pin a is broken through self-checking if the cam line type switching process of the actuating pin a is not reasonable;
the fourth determining unit 408 is configured to continue the self-checking if the execution pin a is broken, and determine whether the execution pin a is broken through the self-checking;
the first determining unit 409 is configured to determine that the rationality problem is unknown if the result is no.
In this embodiment of the present invention, the second determining module 403 further includes:
a fifth judging unit 410, a sixth judging unit 411 and a second judging unit 412.
Wherein the content of the first and second substances,
the fifth judging unit 410 is configured to judge whether the actuating pin B is broken through self-checking if the cam line type switching process of the actuating pin B is not reasonable;
the sixth determining unit 411, configured to continue the self-checking if the execution pin B is broken, and determine whether the execution pin B is broken through the self-checking;
the second determining unit 412 is configured to determine that the rationality problem is unknown if the determination result is no.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
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 apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in a plurality of software and/or hardware when implementing the invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The method and the system for determining variable valve lift switching provided by the invention are described in detail above, and a specific example is applied in the text to explain the principle and the implementation of the invention, and the description of the above embodiment is only used to help understanding 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, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A method for determining variable valve lift switching, comprising:
acquiring the current position of an execution pin group in the variable valve lift mechanism, wherein the execution pin group consists of an execution pin A and an execution pin B;
judging whether the current position is the same as the target position;
if not, aiming at the execution pin A, after the driving signal of the execution pin group lasts for a first duration, if a second voltage fed back by a position sensor of the execution pin group is greater than a second target voltage and the driving is stopped continuously until the driving signal stops driving, judging that the cam line type switching process of the execution pin A is reasonable;
for an execution pin B, after a driving signal of an execution pin group lasts for a second time, if a third voltage fed back by a position sensor of the execution pin group is less than a third target voltage and the driving is stopped continuously until the driving signal stops driving, judging that the cam line type switching process of the execution pin B is reasonable;
when a command for successful switching of the execution pin a or the execution pin B is detected, the switching process of the variable valve lift mechanism is completed.
2. The method of claim 1, further comprising:
if yes, judging whether a first voltage fed back by a position sensor of the execution pin group is a first target voltage or not, wherein the first target voltage refers to that the execution pin A is at an initial position and the execution pin B is at an initial position;
and if not, determining that the switching process of the variable valve lift mechanism is faulty.
3. The method of claim 1, further comprising:
if the cam line type switching process of the execution pin A is unreasonable, judging whether the execution pin A is broken through self-checking;
if not, continuing self-checking, and judging whether the execution pin A is broken or not through self-checking;
if not, the problem of unknown rationality is judged.
4. The method of claim 1, further comprising:
if the cam line type switching process of the execution pin B is unreasonable, judging whether the execution pin B is broken through self-checking;
if not, continuing self-checking, and judging whether the execution pin B is broken through self-checking;
if not, the problem of unknown rationality is judged.
5. The method of claim 3 or 4, further comprising:
counting the times of occurrence of the unknown rationality problem;
and when the frequency of the unknown rationality problem reaches a preset threshold value, reporting a rationality fault.
6. A system for determining variable valve lift switching, comprising:
the variable valve lift mechanism comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the current position of an execution pin group in the variable valve lift mechanism, and the execution pin group consists of an execution pin A and an execution pin B;
the first judgment module is used for judging whether the current position is the same as the target position;
the second judgment module is used for respectively judging the switching process of the execution pin A and the execution pin B if the execution pin A and the execution pin B are not in the switching process;
a completion module configured to complete a switching process of the variable valve lift mechanism when a command for successful switching of the execution pin a or the execution pin B is detected;
wherein the second judging module comprises:
the first judging unit is used for judging that the cam line type switching process of the execution pin A is reasonable when a second voltage fed back by a position sensor of the execution pin group is greater than a second target voltage and continues to stop driving until a driving signal continues to drive after a driving signal of the execution pin group continues for a first duration for the execution pin A;
and the second judging unit is used for judging that the cam line type switching process of the execution pin B is reasonable when the third voltage fed back by the position sensor of the execution pin group is less than a third target voltage and the driving signal is continuously stopped after the driving signal of the execution pin group continues for a second time period aiming at the execution pin B.
7. The system of claim 6, further comprising:
a third judging unit, which judges whether the actuating pin A is broken or not through self-checking if the cam line type switching process of the actuating pin A is unreasonable;
a fourth judging unit, configured to continue self-checking if the execution pin a is broken, and judge whether the execution pin a is broken through self-checking;
and the first judgment unit is used for judging that the rationality problem is unknown if the rationality problem is not known.
8. The system of claim 6, further comprising:
the fifth judging unit is used for judging whether the actuating pin B is broken or not through self-checking if the cam line type switching process of the actuating pin B is unreasonable;
a sixth judging unit, configured to continue self-checking if the execution pin B is broken, and judge whether the execution pin B is broken through self-checking;
and the second judgment unit is used for judging that the rationality problem is unknown if the rationality problem is not judged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810934655.4A CN110836143B (en) | 2018-08-16 | 2018-08-16 | Method and system for judging variable valve lift switching |
Applications Claiming Priority (1)
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