CN114692296A - Engine exhaust valve spring testing method and system, terminal device and storage medium - Google Patents
Engine exhaust valve spring testing method and system, terminal device and storage medium Download PDFInfo
- Publication number
- CN114692296A CN114692296A CN202210243172.6A CN202210243172A CN114692296A CN 114692296 A CN114692296 A CN 114692296A CN 202210243172 A CN202210243172 A CN 202210243172A CN 114692296 A CN114692296 A CN 114692296A
- Authority
- CN
- China
- Prior art keywords
- stress
- detection
- change image
- engine
- rocker arm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Automation & Control Theory (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides a method and a system for testing an engine exhaust valve spring, terminal equipment and a storage medium, wherein the method comprises the following steps: carrying out exhaust braking working condition test on an engine to be tested, and acquiring a stress change image and a pressure change image under the exhaust braking working condition respectively; detecting the falling of the rocker arm according to the stress variation image; if the falling detection of the rocker arm is qualified, carrying out air inlet adjustment detection on the stress change image; and if the air inlet regulation detection is unqualified, determining the maximum exhaust back pressure value of the exhaust valve spring on the engine to be detected according to the zero-crossing working condition in the stress change image and the pressure change image. If the drop detection of the rocker arm is qualified and the air inlet adjustment detection is unqualified, the maximum exhaust back pressure value of the exhaust valve spring can be automatically determined through the zero-crossing working condition and the pressure change image in the stress change image, and the accuracy of the maximum exhaust back pressure value of the exhaust valve spring is improved.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to a method and a system for testing an engine exhaust valve spring, terminal equipment and a storage medium.
Background
As a safety configuration, most light trucks are provided with an exhaust braking system to play an auxiliary braking function under the working condition of long downhill, the opening of a butterfly valve on an exhaust tail pipe is controlled to increase the resistance of an exhaust passage of an engine, so that a piston receives the reverse pressure of high-pressure gas during an exhaust stroke, and at the moment, the engine does not generate power and can be equivalent to a load, thereby achieving the functions of slowing down and controlling the speed of the vehicle. However, the reverse high-pressure gas may cause a certain disturbance to an exhaust valve spring on the engine, which may cause a bounce of the exhaust valve of an engine valve train or a flying-off phenomenon of a rocker arm, and if the matching is not good, the valve often bounces or the rocker arm flies off, which may cause a certain damage to an engine valve distributor, even a serious failure such as a fracture of the exhaust valve spring and a locking of the rocker arm occurs, so that the backpressure test on the exhaust valve spring on the engine is particularly important.
In the existing test process of the engine exhaust valve spring, the exhaust braking working condition of the engine is simulated, and under the simulation of the exhaust braking working condition, the pressure of an exhaust braking butterfly valve pipeline is directly measured to obtain the maximum exhaust back pressure value of the exhaust valve spring.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and a system for testing an engine exhaust valve spring, a terminal device, and a storage medium, so as to solve the problem that the measurement accuracy of the maximum exhaust back pressure value of the exhaust valve spring is low in the existing engine exhaust valve spring testing process.
The first aspect of the embodiment of the invention provides a method for testing an engine exhaust valve spring, which comprises the following steps:
carrying out exhaust braking working condition test on an engine to be tested, and respectively collecting stress change of a rocker arm of the engine to be tested and pressure change of an exhaust braking butterfly valve pipeline under the exhaust braking working condition to obtain a stress change image and a pressure change image;
detecting the falling of the rocker arm according to the stress change image, wherein the falling detection is used for detecting whether the rocker arm falls off or not;
if the falling detection of the rocker arm is qualified, carrying out air inlet adjustment detection on the stress change image, wherein the air inlet adjustment detection is used for detecting whether the opening of an air inlet throttle valve on the engine to be detected is increased or not;
and if the air inlet regulation detection is unqualified, determining the maximum exhaust back pressure value of the exhaust valve spring on the engine to be detected according to the zero-crossing working condition in the stress change image and the pressure change image.
Further, after the air intake adjustment detection is performed on the stress variation image, the method further includes:
and if the air inlet regulation detection is qualified, increasing the opening degree of the air inlet throttle valve, and returning to execute the step of respectively acquiring the stress change of the rocker arm of the engine to be detected and the pressure change of the exhaust brake butterfly valve pipeline under the exhaust brake working condition according to the increased opening degree of the air inlet throttle valve to obtain a stress change image and a pressure change image and the subsequent steps until the falling detection of the rocker arm is qualified and the air inlet regulation detection is unqualified.
Further, the detecting that the rocker arm falls off according to the stress variation image includes:
respectively obtaining stress difference values between adjacent stress points in the stress change image, wherein the stress points are used for representing stress values of the rocker arm at non-use time points;
determining a motion interval in the stress change image according to the stress difference value;
if the stress value of any stress point in the motion interval is equal to 0, judging that the falling detection of the rocker arm is unqualified;
and if the stress values of the stress points in the motion interval are all larger than 0, judging that the falling detection of the rocker arm is qualified.
Further, the performing intake air adjustment detection on the stress variation image includes:
determining an idle speed interval in the stress change image according to the stress difference value, and calculating an average stress value of stress points in the idle speed interval;
if the average stress value is smaller than a preset stress value, judging that the air intake regulation detection is qualified;
and if the average stress value is greater than or equal to the preset stress value, determining that the air intake regulation detection is unqualified.
Further, the determining the maximum exhaust back pressure value of the exhaust valve spring in the engine to be tested according to the zero-crossing point working condition in the stress change image and the pressure change image includes:
carrying out zero crossing point detection on the stress change image to obtain a zero crossing point working condition, and generating a backpressure detection time period according to the working condition time and preset duration of the zero crossing point working condition;
and determining the maximum pressure value in the backpressure detection time period in the pressure change image as the maximum exhaust backpressure value.
Further, the method, after increasing the opening degree of the intake throttle valve, further includes:
and if the falling detection of the rocker arm is unqualified and/or the opening increasing times of the air inlet throttle valve is larger than a time threshold value, sending a test error prompt.
Further, before carrying out the exhaust braking condition test on the engine to be tested, the method further comprises the following steps:
and carrying out vehicle-mounted parameter setting on the engine to be tested according to preset vehicle-mounted conditions, and carrying out opening setting on the air inlet throttle valve according to preset valve opening.
A second aspect of an embodiment of the present invention provides an engine exhaust valve spring testing system, including:
the working condition testing module is used for testing the exhaust braking working condition of the engine to be tested and respectively collecting the stress change of the rocker arm of the engine to be tested and the pressure change of an exhaust braking butterfly valve pipeline under the exhaust braking working condition to obtain a stress change image and a pressure change image;
the falling detection module is used for detecting falling of the rocker arm according to the stress change image, and the falling detection is used for detecting whether the rocker arm falls;
the adjustment detection module is used for carrying out air inlet adjustment detection on the stress change image if the falling detection of the rocker arm is qualified, and the air inlet adjustment detection is used for detecting whether the opening of an air inlet throttle valve on the engine to be detected is increased or not;
and the exhaust back pressure value determining module is used for determining the maximum exhaust back pressure value of the exhaust valve spring on the engine to be detected according to a zero-crossing working condition in the stress change image and the pressure change image if the air inlet regulation detection is unqualified.
A third aspect of the embodiments of the present invention provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the terminal device, wherein the processor implements the steps of the engine exhaust valve spring testing method provided by the first aspect when executing the computer program.
A fourth aspect of an embodiment of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the engine exhaust valve spring testing method provided by the first aspect.
The engine exhaust valve spring testing method, the engine exhaust valve spring testing system, the terminal device and the storage medium provided by the embodiment of the invention have the following beneficial effects: by respectively collecting the stress change of the rocker arm of the engine to be tested and the pressure change of the exhaust brake butterfly valve pipeline under the exhaust brake working condition, the data change of the stress of the rocker arm and the pressure of the exhaust brake butterfly valve pipeline under different working condition points can be effectively obtained, the dropping detection of the rocker arm is carried out through the stress change image, whether the rocker arm has the dropping phenomenon under the current opening degree of the air inlet throttle valve can be effectively detected, the accuracy of the engine exhaust valve spring test is effectively improved based on the dropping detection of the rocker arm, the air inlet regulation detection is carried out through the stress change image to detect whether the opening degree of the air inlet throttle valve can be increased, the upper limit value of the maximum exhaust back pressure value of the exhaust valve spring is improved through detecting whether the opening degree of the air inlet throttle valve can be increased, if the dropping detection of the rocker arm is qualified, the air inlet regulation detection is unqualified, and through the zero crossing point working condition and the pressure change image in the stress change image, the maximum exhaust back pressure value of the exhaust valve spring can be automatically determined, the accuracy of the maximum exhaust back pressure value of the exhaust valve spring is improved, and the phenomenon that the measurement accuracy of the maximum exhaust back pressure value is low due to the fact that the pressure of an exhaust brake butterfly valve pipeline is directly measured is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described 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 to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of an implementation of a method for testing an engine exhaust valve spring according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a stress variation image provided by an embodiment of the invention;
FIG. 3 is a flowchart illustrating a method for testing an engine exhaust valve spring according to another embodiment of the present invention;
FIG. 4 is a block diagram of a system for testing an engine exhaust valve spring according to an embodiment of the present invention;
fig. 5 is a block diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1, fig. 1 shows a flowchart for implementing a method for testing an engine exhaust valve spring according to an embodiment of the present invention, including:
step S10, carrying out exhaust brake working condition test on the engine to be tested, and respectively acquiring stress change of a rocker arm of the engine to be tested and pressure change of an exhaust brake butterfly valve pipeline under the exhaust brake working condition to obtain a stress change image and a pressure change image;
the stress change of the rocker arm of the engine to be tested and the pressure change of the exhaust brake butterfly valve pipeline under the exhaust brake working condition are respectively acquired, so that the data change of the stress of the rocker arm and the pressure change of the exhaust brake butterfly valve pipeline under different working condition points can be effectively obtained;
specifically, in this step, a strain gauge is attached to the rocker arm assembly, based on the strain gauge, stress values of different working condition points of the rocker arm in the exhaust brake working condition test process can be effectively collected, and the stress change image is obtained according to the relation between the collected stress values and time, optionally, in this step, the stress change image can be displayed in an oscilloscope manner, the oscilloscope is electrically connected with the strain gauge, the oscilloscope is used for converting electrical signals collected by the strain gauge into image information, please refer to fig. 2, which is a schematic diagram of the stress change image provided in this embodiment, an abscissa in fig. 2 is time, and an ordinate is the stress value of the rocker arm;
furthermore, one side that exhaust braking butterfly valve pipeline is close to the engine is installed high accuracy pressure sensor and pressure reading equipment, and this high accuracy pressure sensor is used for gathering the appointed butterfly valve pipeline of exhaust and is exhausting the pressure value of different operating mode points in the braking operating mode test process, and this pressure reading equipment is used for turning into the pressure value with the signal of telecommunication that high accuracy pressure sensor gathered.
Optionally, in this step, before performing the exhaust braking condition test on the engine to be tested, the method further includes:
carrying out vehicle-mounted parameter setting on the engine to be tested according to preset vehicle-mounted conditions, and carrying out opening setting on the air inlet throttle valve according to preset valve opening;
the preset vehicle-mounted condition and the preset valve opening degree can be set according to user requirements, for example, the preset vehicle-mounted condition can be set to be a half vehicle-mounted condition or a full vehicle-mounted condition, and the preset valve opening degree can be set to be 15%, 18%, 19%, 25% or the like.
Step S20, detecting falling of the rocker arm according to the stress variation image;
the drop detection is used for detecting whether the rocker arm drops or not, and the drop detection is carried out on the rocker arm so as to detect whether the rocker arm drops or not when the air inlet throttle valve is at a preset opening degree under the exhaust braking working condition, so that the accuracy of the engine exhaust valve spring test is improved;
step S30, if the drop detection of the rocker arm is qualified, carrying out air inlet adjustment detection on the stress change image;
the intake regulation detection is used for detecting whether the opening of an intake throttle valve on the engine to be detected is increased or not, and the upper limit value of the maximum exhaust back pressure value of the exhaust valve spring is improved by detecting whether the opening of the intake throttle valve can be increased or not, so that the accuracy of the measurement of the maximum exhaust back pressure value of the exhaust valve spring is improved;
step S40, if the air inlet adjustment detection is unqualified, determining the maximum exhaust back pressure value of the exhaust valve spring on the engine to be detected according to the zero-crossing working condition in the stress change image and the pressure change image;
if the air inlet adjustment detection is unqualified, the opening degree of the air inlet throttle valve cannot be increased, namely the current opening degree of the air inlet throttle valve is the maximum opening degree, so that the maximum exhaust back pressure value of the exhaust valve spring on the engine to be detected is determined according to the zero-crossing working condition and the pressure change image in the stress change image under the current opening degree of the air inlet throttle valve, and the accuracy of determining the maximum exhaust back pressure value of the exhaust valve spring is improved.
Optionally, in this step, after the air intake adjustment and detection are performed on the stress variation image, the method further includes:
if the air inlet regulation detection is qualified, increasing the opening degree of the air inlet throttle valve, and returning to execute the step and the subsequent step of acquiring a stress change image and a pressure change image of a rocker arm of the engine to be detected and the pressure change of an exhaust brake butterfly valve pipeline under the condition of respectively acquiring exhaust brake according to the increased opening degree of the air inlet throttle valve until the falling detection of the rocker arm is qualified and the air inlet regulation detection is unqualified;
if the air inlet regulation detection is qualified, judging that the opening degree of an air inlet throttle valve can be increased, re-executing the collection of stress change of a rocker arm and pressure change of an exhaust brake butterfly valve pipeline under the exhaust brake working condition according to the increased opening degree of the air inlet throttle valve so as to obtain an updated stress change image and an updated pressure change image under the condition of increasing the opening degree of the air inlet throttle valve, and performing falling detection on the rocker arm according to the updated stress change image; if the drop detection of the rocker arm is qualified, carrying out air inlet adjustment detection on the updated stress change image until the air inlet adjustment detection is unqualified;
further, in this step, the determining a maximum exhaust back pressure value of an exhaust valve spring in the engine to be tested according to a zero-crossing point condition in the stress variation image and the pressure variation image includes:
carrying out zero crossing point detection on the stress change image to obtain a zero crossing point working condition, and generating a backpressure detection time period according to the working condition time and preset duration of the zero crossing point working condition;
the method includes detecting whether a zero-crossing working condition exists in a stress change image by detecting the zero-crossing point of the stress change image, obtaining working condition time of the zero-crossing working condition, and generating a backpressure detection time period according to the working condition time of the zero-crossing working condition and a preset time length, preferably, the preset time length can be set according to requirements, for example, the preset time length can be set to 10ms, 1s or 3s, and the like, for example, when the working condition time of the zero-crossing working condition is A and the preset time length is set to 1s, the generated backpressure detection time period is [ A-1, A +1 ].
Determining a maximum pressure value within the backpressure detection time period in the pressure change image as the maximum exhaust backpressure value;
in the step, all pressure values in the backpressure detection period in the pressure change image are obtained, and the obtained maximum pressure value is determined as the maximum exhaust backpressure value.
In the embodiment, by respectively collecting the stress change of the rocker arm of the engine to be tested and the pressure change of the exhaust brake butterfly valve pipeline under the exhaust brake working condition, the data change of the stress of the rocker arm and the pressure of the exhaust brake butterfly valve pipeline under different working condition points can be effectively obtained, the dropping detection is carried out on the rocker arm through the stress change image, whether the rocker arm drops or not under the current opening degree of the air inlet throttle valve can be effectively detected, the accuracy of the test of the exhaust valve spring of the engine is effectively improved based on the dropping detection of the rocker arm, the air inlet regulation detection is carried out through the stress change image to detect whether the opening degree of the air inlet throttle valve can be increased or not, the upper limit value of the maximum exhaust back pressure value of the exhaust valve spring is improved by detecting whether the opening degree of the air inlet throttle valve can be increased or not, if the dropping detection of the rocker arm is qualified, and the air inlet regulation detection is unqualified, the maximum exhaust back pressure value of the exhaust valve spring can be automatically determined through the zero-crossing working condition and the pressure change image in the stress change image, the accuracy of the maximum exhaust back pressure value of the exhaust valve spring is improved, and the phenomenon that the measurement accuracy of the maximum exhaust back pressure value is low due to the fact that the pressure of an exhaust brake butterfly valve pipeline is directly measured is prevented.
Referring to fig. 3, fig. 3 is a flowchart illustrating an implementation of a method for testing an engine exhaust valve spring according to another embodiment of the present invention. With respect to the embodiment of fig. 1, the engine exhaust valve spring testing method provided by the present embodiment is used for further detailing step S20 in the embodiment of fig. 1, and includes:
step S21, respectively obtaining stress difference values between adjacent stress points in the stress change image;
the stress point is used for representing the stress value of the rocker arm at the non-use time point, the stress change strength of the stress of the rocker arm between the adjacent time points can be effectively obtained by respectively obtaining the stress difference value between the adjacent stress points in the stress change image, and when the stress difference value is larger, the stress change strength between the adjacent time points corresponding to the stress difference value is larger;
step S22, determining a motion interval in the stress change image according to the stress difference value;
and determining a region formed between the first sudden change working condition point and the second sudden change working condition point in the stress change image as a motion region.
Step S23, if the stress of any stress point in the motion section is equal to 0, determining that the falling detection of the rocker arm is unqualified;
if the stress value of any stress point in the motion section is equal to 0, judging that the rocker arm has a falling phenomenon, namely, the falling detection of the rocker arm is unqualified;
step S24, if the stress values of the stress points in the motion interval are all larger than 0, judging that the falling detection of the rocker arm is qualified;
and if the stress values of the stress points in the motion interval are all larger than 0, judging that the rocker arm does not fall off, namely, the falling-off detection of the rocker arm is qualified.
Optionally, in this embodiment, regarding step S30, the performing intake air adjustment detection on the stress variation image includes:
determining an idle speed interval in the stress change image according to the stress difference value, and calculating an average stress value of stress points in the idle speed interval;
respectively acquiring the time length values of a first sudden change working condition point and a second sudden change working condition point, if the time length value of the first sudden change working condition point is greater than the time length value of the second sudden change working condition point, determining an idle speed end point of a time point corresponding to the time length value of the second sudden change working condition point, and determining an area formed between a starting time point and the idle speed end point in a stress change image as an idle speed interval;
if the time length value of the first sudden-change working condition point is smaller than the time length value of the second sudden-change working condition point, determining a time point corresponding to the time length value of the first sudden-change working condition point as an idling end point, and determining a region formed between the initial time point and the idling end point in the stress change image as an idling interval;
in the step, the accuracy of air intake regulation detection is effectively improved by calculating the average stress value of the stress point in the idle speed interval.
If the average stress value is smaller than a preset stress value, judging that the air intake regulation detection is qualified;
the preset stress value can be set according to the requirement of a user, if the average stress value is smaller than the preset stress value, the current opening degree of the air inlet throttle valve has larger allowance, and the opening degree of the air inlet throttle valve can be increased, namely, the air inlet regulation detection is qualified;
if the average stress value is larger than or equal to the preset stress value, determining that the air intake regulation detection is unqualified;
if the average stress value is larger than or equal to the preset stress value, the opening degree of the current air intake throttle valve has no large allowance, and the opening degree of the air intake throttle valve cannot be increased, namely the air intake regulation detection is unqualified;
further, in this embodiment, after the increasing the opening degree of the intake throttle valve, the method further includes: and if the falling detection of the rocker arm is unqualified and/or the opening increasing times of the air inlet throttle valve is larger than the time threshold value, sending a test error prompt, wherein the user is prompted that the current engine exhaust valve spring test is wrong by sending the test error prompt and needs to manually check.
In the embodiment, the stress variation intensity of the stress of the rocker arm between the adjacent time points can be effectively obtained by respectively obtaining the stress difference values between the adjacent stress points in the stress variation image, the movement interval in the stress variation image can be effectively determined based on the stress variation intensity of the stress of the rocker arm between the adjacent time points, whether the falling detection of the rocker arm is qualified or not can be effectively judged based on the stress value of the stress point in the determined movement interval, and the accuracy of the falling detection of the rocker arm is improved.
Referring to fig. 4, fig. 4 is a block diagram of an engine exhaust valve spring testing system 100 according to an embodiment of the present invention. The engine exhaust valve spring test system 100 in this embodiment includes various units for performing the steps of the embodiment corresponding to fig. 1 and 3. Please refer to fig. 1 and fig. 3 and the related descriptions in the embodiments corresponding to fig. 1 and fig. 3. For convenience of explanation, only the portions related to the present embodiment are shown. Referring to FIG. 4, an engine exhaust valve spring test system 100 includes: operating mode test module 10, drop detection module 11, adjust detection module 12 and exhaust backpressure value and confirm module 13, wherein:
and the working condition testing module 10 is used for testing the exhaust braking working condition of the engine to be tested and respectively acquiring the stress change of the rocker arm of the engine to be tested and the pressure change of the exhaust braking butterfly valve pipeline under the exhaust braking working condition to obtain a stress change image and a pressure change image.
The stress change of the rocker arm of the engine to be tested and the pressure change of the exhaust brake butterfly valve pipeline under the exhaust brake working condition are respectively acquired, so that the data change of the stress of the rocker arm and the pressure change of the exhaust brake butterfly valve pipeline under different working condition points can be effectively obtained;
specifically, in this step, a strain gauge is attached to the rocker arm assembly, based on the strain gauge, stress values of different working condition points of the rocker arm in the exhaust brake working condition test process can be effectively collected, and the stress change image is obtained according to the relation between the collected stress values and time.
Furthermore, one side that exhaust braking butterfly valve pipeline is close to the engine is installed high accuracy pressure sensor and pressure reading equipment, and this high accuracy pressure sensor is used for gathering the appointed butterfly valve pipeline of exhaust and is exhausting the pressure value of different operating mode points in the braking operating mode test process, and this pressure reading equipment is used for turning into the pressure value with the signal of telecommunication that high accuracy pressure sensor gathered.
Optionally, the condition testing module 10 is further configured to: and carrying out vehicle-mounted parameter setting on the engine to be tested according to preset vehicle-mounted conditions, and carrying out opening setting on the air inlet throttle valve according to preset valve opening.
And the falling detection module 11 is used for detecting the falling of the rocker arm according to the stress change image, and the falling detection is used for detecting whether the rocker arm falls or not.
Optionally, the detachment detection module 11 is further configured to: respectively obtaining stress difference values between adjacent stress points in the stress change image, wherein the stress points are used for representing stress values of the rocker arm at non-use time points;
determining a motion interval in the stress change image according to the stress difference value;
if the stress value of any stress point in the motion interval is equal to 0, judging that the falling detection of the rocker arm is unqualified;
and if the stress values of the stress points in the motion interval are all larger than 0, judging that the falling detection of the rocker arm is qualified.
And the adjusting and detecting module 12 is used for performing air intake adjusting detection on the stress change image if the falling detection of the rocker arm is qualified, and the air intake adjusting detection is used for detecting whether the opening degree of an air intake throttle valve on the engine to be detected is increased.
Optionally, the adjustment detection module 12 is further configured to: and if the air inlet adjustment detection is qualified, increasing the opening degree of the air inlet throttle valve, and returning to execute the step of respectively acquiring the stress change of the rocker arm of the engine to be detected and the pressure change of an exhaust brake butterfly valve pipeline under the exhaust brake working condition according to the increased opening degree of the air inlet throttle valve to obtain a stress change image and a pressure change image and the subsequent steps until the falling detection of the rocker arm is qualified and the air inlet adjustment detection is unqualified.
Further, the adjustment detection module 12 is further configured to: determining an idle speed interval in the stress change image according to the stress difference value, and calculating an average stress value of stress points in the idle speed interval;
if the average stress value is smaller than a preset stress value, judging that the air intake regulation detection is qualified;
and if the average stress value is greater than or equal to the preset stress value, determining that the air intake regulation detection is unqualified.
Further, the adjustment detection module 12 is further configured to: and if the falling detection of the rocker arm is unqualified and/or the opening increasing times of the air inlet throttle valve is larger than a time threshold value, sending a test error prompt.
And the exhaust back pressure value determining module 13 is configured to determine a maximum exhaust back pressure value of an exhaust valve spring in the engine to be detected according to a zero-crossing point working condition in the stress change image and the pressure change image if the intake regulation detection is unqualified.
Optionally, the exhaust back pressure value determination module 13 is further configured to: carrying out zero crossing point detection on the stress change image to obtain a zero crossing point working condition, and generating a backpressure detection time period according to the working condition time and preset duration of the zero crossing point working condition;
and determining the maximum pressure value in the backpressure detection time period in the pressure change image as the maximum exhaust backpressure value.
In the embodiment, by respectively collecting the stress change of the rocker arm of the engine to be tested and the pressure change of the exhaust brake butterfly valve pipeline under the exhaust brake working condition, the data change of the stress of the rocker arm and the pressure of the exhaust brake butterfly valve pipeline under different working condition points can be effectively obtained, the dropping detection is carried out on the rocker arm through the stress change image, whether the rocker arm drops or not under the current opening degree of the air inlet throttle valve can be effectively detected, the accuracy of the test of the exhaust valve spring of the engine is effectively improved based on the dropping detection of the rocker arm, the air inlet regulation detection is carried out through the stress change image to detect whether the opening degree of the air inlet throttle valve can be increased or not, the upper limit value of the maximum exhaust back pressure value of the exhaust valve spring is improved by detecting whether the opening degree of the air inlet throttle valve can be increased or not, if the dropping detection of the rocker arm is qualified, and the air inlet regulation detection is unqualified, the maximum exhaust back pressure value of the exhaust valve spring can be automatically determined through the zero-crossing working condition and the pressure change image in the stress change image, the accuracy of the maximum exhaust back pressure value of the exhaust valve spring is improved, and the phenomenon that the measurement accuracy of the maximum exhaust back pressure value is low due to the fact that the pressure of an exhaust brake butterfly valve pipeline is directly measured is prevented.
Fig. 5 is a block diagram of a terminal device 2 according to another embodiment of the present invention. As shown in fig. 5, the terminal device 2 of this embodiment includes: a processor 20, a memory 21 and a computer program 22 stored in said memory 21 and executable on said processor 20, such as a program of an engine exhaust valve spring test method. The processor 20, when executing the computer program 22, implements the steps in the various embodiments of the engine exhaust valve spring testing methods described above, such as S10-S40 shown in FIG. 1, or S21-S24 shown in FIG. 3. Alternatively, when the processor 20 executes the computer program 22, the functions of the modules in the embodiment corresponding to fig. 3, for example, the functions of the modules 10 to 13 shown in fig. 4, are implemented, for which reference is specifically made to the relevant description in the embodiment corresponding to fig. 3, and details are not repeated here.
Illustratively, the computer program 22 may be divided into one or more units, which are stored in the memory 21 and executed by the processor 20 to accomplish the present invention. The one or more units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 22 in the terminal device 2. For example, the computer program 22 may be divided into an operation condition testing module 10, a drop-off detection module 11, an adjustment detection module 12, and an exhaust back pressure value determination module 13, each of which functions as described above.
The terminal device may include, but is not limited to, a processor 20, a memory 21. It will be appreciated by those skilled in the art that fig. 5 is merely an example of a terminal device 2 and does not constitute a limitation of the terminal device 2 and may include more or less components than those shown, or some components may be combined, or different components, for example the terminal device may also include input output devices, network access devices, buses, etc.
The Processor 20 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 21 may be an internal storage unit of the terminal device 2, such as a hard disk or a memory of the terminal device 2. The memory 21 may also be an external storage device of the terminal device 2, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 2. Further, the memory 21 may also include both an internal storage unit and an external storage device of the terminal device 2. The memory 21 is used for storing the computer program and other programs and data required by the terminal device. The memory 21 may also be used to temporarily store data that has been output or is to be output.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when executed by a processor, the computer program may implement:
carrying out exhaust braking working condition test on an engine to be tested, and respectively collecting stress change of a rocker arm of the engine to be tested and pressure change of an exhaust braking butterfly valve pipeline under the exhaust braking working condition to obtain a stress change image and a pressure change image;
detecting the falling of the rocker arm according to the stress change image, wherein the falling detection is used for detecting whether the rocker arm falls off or not;
if the falling detection of the rocker arm is qualified, carrying out air inlet adjustment detection on the stress change image, wherein the air inlet adjustment detection is used for detecting whether the opening of an air inlet throttle valve on the engine to be detected is increased or not;
and if the air inlet regulation detection is unqualified, determining the maximum exhaust back pressure value of the exhaust valve spring on the engine to be detected according to the zero-crossing working condition in the stress change image and the pressure change image.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An engine exhaust valve spring testing method is characterized by comprising the following steps:
carrying out exhaust braking working condition test on an engine to be tested, and respectively collecting stress change of a rocker arm of the engine to be tested and pressure change of an exhaust braking butterfly valve pipeline under the exhaust braking working condition to obtain a stress change image and a pressure change image;
detecting the falling of the rocker arm according to the stress change image, wherein the falling detection is used for detecting whether the rocker arm falls off or not;
if the falling detection of the rocker arm is qualified, carrying out air inlet adjustment detection on the stress change image, wherein the air inlet adjustment detection is used for detecting whether the opening of an air inlet throttle valve on the engine to be detected is increased or not;
and if the air inlet regulation detection is unqualified, determining the maximum exhaust back pressure value of the exhaust valve spring on the engine to be detected according to the zero-crossing working condition in the stress change image and the pressure change image.
2. The engine exhaust valve spring testing method according to claim 1, characterized by, after the intake air adjustment detection is performed on the stress variation image, further comprising:
and if the air inlet adjustment detection is qualified, increasing the opening degree of the air inlet throttle valve, and returning to execute the step of respectively acquiring the stress change of the rocker arm of the engine to be detected and the pressure change of an exhaust brake butterfly valve pipeline under the exhaust brake working condition according to the increased opening degree of the air inlet throttle valve to obtain a stress change image and a pressure change image and the subsequent steps until the falling detection of the rocker arm is qualified and the air inlet adjustment detection is unqualified.
3. The engine exhaust valve spring testing method according to claim 1, wherein said detecting the rocker arm falling off based on said stress variation image comprises:
respectively obtaining stress difference values between adjacent stress points in the stress change image, wherein the stress points are used for representing stress values of the rocker arm at non-use time points;
determining a motion interval in the stress change image according to the stress difference value;
if the stress value of any stress point in the motion interval is equal to 0, judging that the falling detection of the rocker arm is unqualified;
and if the stress values of the stress points in the motion interval are all larger than 0, judging that the falling detection of the rocker arm is qualified.
4. The engine exhaust valve spring testing method of claim 3, wherein said performing intake air adjustment detection on said stress variation pattern comprises:
determining an idle speed interval in the stress change image according to the stress difference value, and calculating an average stress value of stress points in the idle speed interval;
if the average stress value is smaller than a preset stress value, judging that the air intake regulation detection is qualified;
and if the average stress value is greater than or equal to the preset stress value, determining that the air inlet adjustment detection is unqualified.
5. The engine exhaust valve spring testing method according to claim 1, wherein the determining the maximum exhaust back pressure value of the exhaust valve spring on the engine to be tested according to the zero-crossing working condition in the stress change image and the pressure change image comprises the following steps:
carrying out zero crossing point detection on the stress change image to obtain a zero crossing point working condition, and generating a backpressure detection time period according to the working condition time and preset duration of the zero crossing point working condition;
and determining the maximum pressure value in the back pressure detection period in the pressure change image as the maximum exhaust back pressure value.
6. The engine exhaust valve spring testing method according to claim 2, characterized by further comprising, after said increasing the opening of said intake throttle valve:
and if the falling detection of the rocker arm is unqualified and/or the opening increasing times of the air inlet throttle valve is larger than a time threshold value, sending a test error prompt.
7. The engine exhaust valve spring testing method according to any one of claims 1 to 6, characterized by further comprising, before the test of the exhaust braking condition of the engine to be tested:
and carrying out vehicle-mounted parameter setting on the engine to be tested according to preset vehicle-mounted conditions, and carrying out opening setting on the air inlet throttle valve according to preset valve opening.
8. An engine exhaust valve spring testing system, comprising:
the working condition testing module is used for testing the exhaust braking working condition of the engine to be tested and respectively collecting the stress change of the rocker arm of the engine to be tested and the pressure change of an exhaust braking butterfly valve pipeline under the exhaust braking working condition to obtain a stress change image and a pressure change image;
the falling detection module is used for detecting falling of the rocker arm according to the stress change image, and the falling detection is used for detecting whether the rocker arm falls;
the adjustment detection module is used for carrying out air inlet adjustment detection on the stress change image if the falling detection of the rocker arm is qualified, and the air inlet adjustment detection is used for detecting whether the opening of an air inlet throttle valve on the engine to be detected is increased or not;
and the exhaust back pressure value determining module is used for determining the maximum exhaust back pressure value of the exhaust valve spring on the engine to be detected according to a zero-crossing working condition in the stress change image and the pressure change image if the air inlet regulation detection is unqualified.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210243172.6A CN114692296A (en) | 2022-03-11 | 2022-03-11 | Engine exhaust valve spring testing method and system, terminal device and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210243172.6A CN114692296A (en) | 2022-03-11 | 2022-03-11 | Engine exhaust valve spring testing method and system, terminal device and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114692296A true CN114692296A (en) | 2022-07-01 |
Family
ID=82139061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210243172.6A Pending CN114692296A (en) | 2022-03-11 | 2022-03-11 | Engine exhaust valve spring testing method and system, terminal device and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114692296A (en) |
-
2022
- 2022-03-11 CN CN202210243172.6A patent/CN114692296A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101532915B (en) | Calibration method of vehicle exhaust emission and vehicle-mounted self-diagnosis system | |
| US6666201B1 (en) | System and method for diagnosing EGR performance using NOx sensor | |
| US20150275753A1 (en) | Method for Monitoring at Least One Exhaust Gas Turbocharger | |
| CN112946485A (en) | Vehicle battery detection method, storage medium and device | |
| CN112983690B (en) | Flow diagnosis method and device of EGR (exhaust gas Recirculation) system and automobile | |
| US8245689B2 (en) | Method and device for monitoring control and regulating loops in an engine system | |
| CN116220870A (en) | Control method and device for vehicle exhaust emission, electronic equipment and storage medium | |
| CN113673089B (en) | Engine performance determining method and device and electronic equipment | |
| CN113689038B (en) | Engine cylinder fault prediction method based on multi-sensor fuzzy evaluation | |
| CN111868356B (en) | Method for checking variable valve lift control of an internal combustion engine | |
| CN113094913B (en) | Emission estimation method and device | |
| CN114692296A (en) | Engine exhaust valve spring testing method and system, terminal device and storage medium | |
| WO2023169118A1 (en) | Engine control method and apparatus, storage medium, and computer device | |
| CN114757117B (en) | Diesel engine air inlet channel performance evaluation method, system, terminal equipment and storage medium | |
| WO2022142937A1 (en) | Method and apparatus for positioning leaking cylinder in engine, and oscilloscope | |
| JP2004184228A (en) | Knocking detector | |
| CN115467752B (en) | Method, system and computer storage medium for diagnosing and analyzing fire of automobile engine | |
| CN115144668A (en) | Fault detection method, signal simulator and fault detection system | |
| CN113448301A (en) | Fault diagnosis method and system based on OBD system | |
| FR3097961A1 (en) | Method and device for evaluating and selecting signal comparison metrics | |
| CN114776447B (en) | Fault diagnosis method, device, terminal and storage medium for variable valve lift | |
| CN113147388B (en) | Vehicle accelerator pedal position analysis method and system | |
| CN114896766B (en) | DPF filtering efficiency calibration method and device and electronic equipment | |
| CN114212095B (en) | Method, system and equipment for determining vehicle starting key factors based on simulation | |
| CN112282922B (en) | Method and device for detecting faults of pressure release valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |