CN110219759B - Static leakage measuring method, device and system of oil sprayer - Google Patents
Static leakage measuring method, device and system of oil sprayer Download PDFInfo
- Publication number
- CN110219759B CN110219759B CN201910711969.2A CN201910711969A CN110219759B CN 110219759 B CN110219759 B CN 110219759B CN 201910711969 A CN201910711969 A CN 201910711969A CN 110219759 B CN110219759 B CN 110219759B
- Authority
- CN
- China
- Prior art keywords
- engine
- determining
- rail pressure
- determining whether
- fuel injection
- 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.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/006—Measuring or detecting fuel leakage of fuel injection apparatus
Abstract
The invention provides a static leakage measuring method and a device of an oil injector, which are characterized in that a rail pressure value in a high-pressure common rail system is obtained when an engine is in a static state, the rail pressure value in the high-pressure common rail system is obtained when the engine is in an overRun state, the rail pressure difference value of the high-pressure common rail system in two different states, namely the engine is in the static state and the engine is in the overRun state, is calculated, the rail pressure difference value of the high-pressure common rail system is judged to exceed a preset rail pressure threshold value, the static leakage of the oil injector in the high-pressure common rail system is indicated, and otherwise, the static leakage of the oil injector in the high-pressure common rail system is. The detection of whether the static leakage exists in the fuel injector is realized.
Description
Technical Field
The invention belongs to the technical field of oil injectors, and particularly relates to a static leakage measuring method, device and system of an oil injector.
Background
The problem of static leakage of the oil injector caused by abrasion, damage and the like exists in the oil injector in the high-pressure common rail system, and further the fuel consumption is high.
Therefore, a method, an apparatus and a system for measuring static leakage of an injector are needed to detect whether the injector has static leakage.
Disclosure of Invention
In view of this, the present invention provides a method, an apparatus, and a system for measuring a static leakage of an injector, which are used to solve the problem in the prior art that whether the injector has a static leakage cannot be detected.
The technical scheme is as follows:
the invention provides a static leakage measuring method of a fuel injector, which comprises the following steps:
determining whether the engine is in a steady state condition;
if the engine is determined to be in a steady state, acquiring a first rail pressure value in the high-pressure common rail system;
determining whether the engine is in overRun state;
if the engine is determined to be in the overRun state, acquiring a second rail pressure value in the high-pressure common rail system;
calculating a rail pressure difference value between the first rail pressure value and the second rail pressure value;
judging whether the absolute value of the rail pressure difference value is greater than or equal to a preset rail pressure threshold value or not;
and if the absolute value of the rail pressure difference value is judged to be larger than or equal to a preset rail pressure threshold value, determining that the static leakage of the oil injector exists.
Preferably, the determining whether the engine is in a steady state includes:
acquiring the fuel injection quantity and the engine rotating speed;
determining whether the fuel injection quantity is within a preset fuel injection quantity range or not, and determining whether the rotating speed of the engine is within a preset rotating speed range or not;
and if the fuel injection quantity is within the preset fuel injection quantity range and the rotating speed of the engine is within the preset rotating speed range, determining that the engine is in a steady state.
Preferably, the determining whether the engine is in overRun state includes:
acquiring the fuel injection quantity and the engine rotating speed;
determining whether the engine speed is not 0 and determining whether the fuel injection quantity is 0;
and if the engine speed is not 0 and the fuel injection quantity is 0, determining that the engine is in an overRun state.
Preferably, before determining whether the engine is in the steady state, the method further comprises:
determining whether a fault exists in a fuel system of an engine;
if it is determined that there is no fault with the engine fuel system, the step of determining whether the engine is in a steady state condition is performed.
Preferably, the method further comprises the following steps:
and if the engine is determined not to be in the steady state, returning to the step of determining whether the fuel system of the engine has a fault.
The invention also provides a static leakage measuring device of the oil sprayer, which comprises:
a first determination unit for determining whether the engine is in a steady state;
the high-pressure common rail system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a first rail pressure value in the high-pressure common rail system when the engine is determined to be in a steady state;
the first determination unit is further used for determining whether the engine is in an overRun state;
the obtaining unit is further used for obtaining a second rail pressure value in the high-pressure common rail system when the engine is determined to be in an overRun state;
a calculation unit configured to calculate a rail pressure difference value between the first rail pressure value and the second rail pressure value;
the judging unit is used for judging whether the absolute value of the rail pressure difference value is larger than or equal to a preset rail pressure threshold value or not;
and the second determining unit is used for determining that the static leakage exists in the oil injector when the absolute value of the rail pressure difference value is judged to be greater than or equal to a preset rail pressure threshold value.
Preferably, the first determination unit includes:
the acquisition subunit is used for acquiring the fuel injection quantity and the engine rotating speed;
the first determining subunit is used for determining whether the fuel injection quantity is within a preset fuel injection quantity range and determining whether the engine rotating speed is within a preset rotating speed range;
and the second determining subunit is used for determining that the engine is in a steady state when the fuel injection quantity is determined to be within the preset fuel injection quantity range and the engine speed is determined to be within the preset speed range.
Preferably, the first determination unit further includes:
a third determining subunit, configured to determine whether the engine speed is not 0, and determine whether the fuel injection amount is 0;
and the fourth determining subunit is used for determining that the engine is in an overRun state when the engine speed is determined to be not 0 and the fuel injection quantity is 0.
Preferably, the method further comprises the following steps:
a third determination unit for determining whether there is a fault in the engine fuel system; the first determination unit is invoked upon determining that there is no fault with the engine fuel system.
The invention also provides a static leakage measuring system of the oil sprayer, which comprises:
the above static leak measuring device;
a high pressure common rail system connected to the static leakage measuring device; the high-pressure common rail system at least comprises a high-pressure oil pump, a common rail pipe and an oil injector.
Compared with the prior art, the technical scheme provided by the application has the following advantages:
according to the technical scheme, the rail pressure value in the high-pressure common rail system is obtained when the engine is in a static state, the rail pressure value in the high-pressure common rail system is obtained when the engine is in an overRun state, the rail pressure difference value of the high-pressure common rail system in two different states, namely the static state of the engine and the overRun state of the engine, is calculated, the rail pressure difference value of the high-pressure common rail system is judged to exceed a preset rail pressure threshold value, it is judged that the static leakage exists in an oil injector in the high-pressure common rail system, and otherwise, it is judged that the static leakage does not exist in the oil injector in the high-pressure common rail system. The detection of whether the static leakage exists in the fuel injector is realized.
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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method of static leak measurement of a fuel injector as disclosed herein;
FIG. 2 is a flow chart of another disclosed method of static leak measurement of a fuel injector;
FIG. 3 is a block diagram of a static leak measurement device for a fuel injector according to the present disclosure;
FIG. 4 is a block diagram of another fuel injector static leak measurement arrangement of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The embodiment of the application provides a static leakage measuring method of a fuel injector, which is applied to an engine fuel system. The engine fuel system comprises a high-pressure common rail system, an electric control monoblock pump, an electric control pump nozzle, an electric control in-line pump and an electric control cooling EGR system. The high-pressure common rail system comprises a high-pressure oil pump, a common rail pipe and an oil injector. The static leakage measuring method of the injector provided by the embodiment is used for detecting whether static leakage exists in the injector in a high-pressure common rail system.
Specifically, as shown in fig. 1, the method for measuring the static leakage of the fuel injector provided by the embodiment of the present application may include:
and S101, determining whether the engine is in a steady state or not.
After the engine ECU is powered on, whether the engine is in a steady state or not is determined. If the rotating speed of the engine and the fuel injection quantity of the fuel injector fluctuate within a certain range, the engine is indicated to run in a steady state under the current working condition, namely the engine is in a steady state. Otherwise, it is determined that the engine is not in a steady state condition.
If the engine is determined to be in the steady state, executing step S102;
if the engine is determined not to be in the steady state, the execution of the determination whether the engine is in the steady state is returned.
S102, obtaining a first rail pressure value in the high-pressure common rail system.
And detecting the pressure value in the common rail pipe through a pressure sensor arranged on the common rail pipe of the high-pressure common rail system as an actual rail pressure value in the high-pressure common rail system. When the engine is in a steady state, the actual rail pressure value detected by the pressure sensor provided on the common rail pipe is a first rail pressure value, which is denoted as P1.
S103, determining whether the engine is in an overRun state.
If the engine is in operation, but the engine torque demand is 0 and the fuel injection quantity is 0, the engine is in overRun state. For example, in a condition where the throttle is suddenly released when the vehicle is running downhill or the engine is running at high speed, the engine is in an overRun state.
If the engine is determined to be in the overRun state, executing step S104;
and if the engine is determined not to be in the overRun state, waiting for the engine to be in the overRun state.
And S104, acquiring a second rail pressure value in the high-pressure common rail system.
And detecting the pressure value in the common rail pipe through a pressure sensor arranged on the common rail pipe of the high-pressure common rail system as an actual rail pressure value in the high-pressure common rail system. When the engine is in the overRun state, the actual rail pressure value detected by the pressure sensor arranged on the common rail pipe is a second rail pressure value which is recorded as P2.
And S105, calculating a rail pressure difference value between the first rail pressure value and the second rail pressure value.
And calculating the rail pressure difference value of the high-pressure common rail system in two different states, namely a steady state and an overRun state, based on the formula P' = P1-P2. P' represents the rail pressure difference value.
S106, judging whether the absolute value of the rail pressure difference value is larger than or equal to a preset rail pressure threshold value or not;
if the absolute value of the rail pressure difference value is judged to be greater than or equal to a preset rail pressure threshold value, namely | P' | is greater than or equal to Δ P, executing step S107;
and if the absolute value of the rail pressure difference value is judged to be less than or equal to a preset rail pressure threshold value, namely | P' | <ΔP, determining that the static leakage does not exist in the fuel injector. Where Δ P represents a preset rail pressure threshold.
And S107, determining that the injector has static leakage.
Through the technical scheme, in the embodiment, the rail pressure value in the high-pressure common rail system is obtained when the engine is in the static state, the rail pressure value in the high-pressure common rail system is obtained when the engine is in the overRun state, the rail pressure difference value of the high-pressure common rail system in two different states, namely the static state of the engine and the overRun state of the engine, is calculated, and the rail pressure difference value of the high-pressure common rail system is judged to exceed the preset rail pressure threshold value, so that the static leakage of an oil injector in the high-pressure common rail system is indicated, otherwise, the static leakage of the oil injector in the high-pressure common rail system is not indicated. The detection of whether the static leakage exists in the fuel injector is realized.
In other embodiments, after determining that a static leak exists at the fuel injector, the method further comprises:
and outputting fault information of the oil sprayer to prompt that the oil sprayer has static leakage and remind technicians to process so as to reduce fuel consumption.
Referring to fig. 2, another method for measuring static leakage of a fuel injector provided in the present embodiment may include the following steps:
s201, determining whether the engine fuel system has a fault.
After the engine ECU is electrified and operated, whether a fault exists in an engine fuel system is determined. One implementation is that an engine ECU acquires vehicle fault information, where the vehicle fault information includes all fault information of the vehicle, and finds whether there is fault information corresponding to an engine fuel system in the vehicle fault information.
In practical application, the fault information comprises fault codes and fault descriptions, the fault codes are used for uniquely identifying faults, and the positions of faults, such as an oil injector and an accelerator, on a vehicle can be determined through the fault codes; the fault description is used to explain the faults that occur so that the technician can understand the faults that are currently occurring to make the corresponding treatment.
If the engine fuel system is determined to have no fault, executing step S202;
if the engine fuel system is determined to have a fault, the process is ended, and fault information is output to prompt a user to process the fault of the engine fuel system so as to ensure the normal operation of the engine.
S202, determining whether the engine is in a steady state.
The method comprises the steps of obtaining the current fuel injection quantity of the engine and the engine rotating speed, determining whether the fuel injection quantity is in a preset fuel injection quantity range, and determining whether the engine rotating speed is in a preset rotating speed range. If the fuel injection quantity is within the preset fuel injection quantity range and the engine rotating speed is within the preset rotating speed range, the fuel injection quantity fluctuates within the normal range and the engine rotating speed also fluctuates within the normal range, and the engine is determined to be in a steady state.
If the engine is determined to be in the steady state, executing step S203;
if it is determined that the engine is not in the steady state, the process returns to step S201.
S203, acquiring a first rail pressure value in the high-pressure common rail system.
And when the engine is in a steady state, detecting an actual rail pressure value as a first rail pressure value by a pressure sensor arranged on the common rail pipe.
S204, determining whether the engine is in an overRun state.
The method comprises the steps of obtaining the current fuel injection quantity of the engine and the engine rotating speed, determining whether the engine rotating speed is not 0, and determining whether the fuel injection quantity is 0. If the rotating speed of the engine is not 0, the engine is in operation, and if the fuel injection quantity is 0, the fuel injector does not inject fuel, the engine is determined to be in an overRun state.
For example, when the engine is in a high-speed operation, the accelerator is suddenly released (the throttle opening is 0) or the engine speed is not controlled from the outside until the engine speed enters a low idle speed, and the engine is in an overRun state.
If the engine is determined to be in the overRun state, executing step S205;
and if the engine is determined not to be in the overRun state, waiting for the engine to be in the overRun state.
And S205, acquiring a second rail pressure value in the high-pressure common rail system.
And when the engine is in the overRun state, the actual rail pressure value detected by the pressure sensor arranged on the common rail pipe is the second rail pressure value.
S206, calculating a rail pressure difference value between the first rail pressure value and the second rail pressure value.
And calculating the rail pressure difference value of the high-pressure common rail system in two different states, namely a steady state and an overRun state of the engine.
S207, judging whether the absolute value of the rail pressure difference value is larger than or equal to a preset rail pressure threshold value or not;
if the absolute value of the rail pressure difference value is larger than or equal to the preset rail pressure threshold value, executing a step S208;
and if the absolute value of the rail pressure difference value is judged to be smaller than or equal to a preset rail pressure threshold value, determining that the static leakage does not exist in the oil sprayer.
And S208, determining that the static leakage exists in the fuel injector.
Through the technical scheme, in the embodiment, the rail pressure value in the high-pressure common rail system is obtained when the engine is in the static state, the rail pressure value in the high-pressure common rail system is obtained when the engine is in the overRun state, the rail pressure difference value of the high-pressure common rail system in two different states, namely the static state of the engine and the overRun state of the engine, is calculated, and the rail pressure difference value of the high-pressure common rail system is judged to exceed the preset rail pressure threshold value, so that the static leakage of an oil injector in the high-pressure common rail system is indicated, otherwise, the static leakage of the oil injector in the high-pressure common rail system is not indicated. The detection of whether the static leakage exists in the fuel injector is realized. And whether the engine fuel system has a fault is determined firstly, and the rail pressure value in the high-pressure common rail system when the engine is in the static state and the overRun state respectively is determined only under the condition that the engine fuel system has no fault, so that the influence of the fault of the engine fuel system on the static leakage detection result of the fuel injector is avoided, and the accuracy of the detection result is improved.
In correspondence to the method for measuring static leakage of an injector disclosed in the above embodiment, the present embodiment further provides a device for measuring static leakage of an injector, which may be integrated in a high-pressure common rail system, and as shown in fig. 3, the device may include:
a first determination unit 301, an acquisition unit 302, a calculation unit 303, a judgment unit 304, and a second determination unit 305.
A first determination unit 301 for determining whether the engine is in a steady state.
Optionally, the first determining unit 301 includes:
the method comprises the steps of obtaining a subunit, a first determining subunit and a second determining subunit;
the acquisition subunit is used for acquiring the fuel injection quantity and the engine rotating speed;
the first determining subunit is used for determining whether the fuel injection quantity is within a preset fuel injection quantity range and determining whether the engine rotating speed is within a preset rotating speed range;
and the second determining subunit is used for determining that the engine is in a steady state when the fuel injection quantity is determined to be within the preset fuel injection quantity range and the engine rotating speed is determined to be within the preset rotating speed range.
An obtaining unit 302 is configured to obtain a first rail pressure value in the high pressure common rail system when it is determined that the engine is in a steady state.
The first determination unit 301 is further configured to determine whether the engine is in an overRun state.
Optionally, the first determining unit 301 further includes:
a third determining subunit and a fourth determining subunit;
the third determining subunit is configured to determine whether the engine speed is not 0, and determine whether the fuel injection amount is 0;
and the fourth determining subunit is used for determining that the engine is in an overRun state when the engine speed is determined to be not 0 and the fuel injection quantity is 0.
The obtaining unit 302 is further configured to obtain a second rail pressure value in the high-pressure common rail system when the engine is determined to be in the overRun state;
a calculating unit 303, configured to calculate a rail pressure difference value between the first rail pressure value and the second rail pressure value;
a judging unit 304, configured to judge whether an absolute value of the rail pressure difference is greater than or equal to a preset rail pressure threshold;
and a second determining unit 305, configured to determine that a static leakage exists in the injector when the absolute value of the rail pressure difference is greater than or equal to a preset rail pressure threshold.
Through the technical scheme, in the embodiment, the rail pressure value in the high-pressure common rail system is obtained when the engine is in the static state, the rail pressure value in the high-pressure common rail system is obtained when the engine is in the overRun state, the rail pressure difference value of the high-pressure common rail system in two different states, namely the static state of the engine and the overRun state of the engine, is calculated, and the rail pressure difference value of the high-pressure common rail system is judged to exceed the preset rail pressure threshold value, so that the static leakage of an oil injector in the high-pressure common rail system is indicated, otherwise, the static leakage of the oil injector in the high-pressure common rail system is not indicated. The detection of whether the static leakage exists in the fuel injector is realized.
Optionally, in other embodiments, the apparatus may further include: an output unit;
the output unit is configured to output the failure information of the fuel injector after the second determining unit 305 determines that the fuel injector has the static leakage, so as to prompt the fuel injector that the static leakage exists, and prompt a technician to perform processing, so as to reduce fuel consumption.
Optionally, in other embodiments, referring to fig. 4, a third determining unit 401 is further included on the apparatus shown in fig. 3;
a third determination unit 401 for determining whether there is a fault in the engine fuel system; the first determination unit 301 is invoked when it is determined that there is no fault with the engine's fuel system.
Through the technical scheme, in the embodiment, the rail pressure value in the high-pressure common rail system is obtained when the engine is in the static state, the rail pressure value in the high-pressure common rail system is obtained when the engine is in the overRun state, the rail pressure difference value of the high-pressure common rail system in two different states, namely the static state of the engine and the overRun state of the engine, is calculated, and the rail pressure difference value of the high-pressure common rail system is judged to exceed the preset rail pressure threshold value, so that the static leakage of an oil injector in the high-pressure common rail system is indicated, otherwise, the static leakage of the oil injector in the high-pressure common rail system is not indicated. The detection of whether the static leakage exists in the fuel injector is realized. And whether the engine fuel system has a fault is determined firstly, and the rail pressure value in the high-pressure common rail system when the engine is in the static state and the overRun state respectively is determined only under the condition that the engine fuel system has no fault, so that the influence of the fault of the engine fuel system on the static leakage detection result of the fuel injector is avoided, and the accuracy of the detection result is improved.
In addition, the embodiment of the application also provides a static leakage measuring system of the fuel injector, wherein the static leakage measuring system comprises the static leakage measuring device shown in the figure 3 or the figure 4 and a high-pressure common rail system connected with the static leakage measuring device. The high-pressure common rail system comprises a high-pressure oil pump, a common rail pipe and an oil injector. Whether static leakage exists in an oil injector in the high-pressure common rail system or not can be detected by using the static leakage measuring device.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
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.
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 foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A method of measuring static leakage from a fuel injector, comprising:
determining whether the engine is in a steady state condition;
if the engine is determined to be in a steady state, acquiring a first rail pressure value in the high-pressure common rail system;
determining whether the engine is in overRun state;
if the engine is determined to be in the overRun state, acquiring a second rail pressure value in the high-pressure common rail system;
calculating a rail pressure difference value between the first rail pressure value and the second rail pressure value;
judging whether the absolute value of the rail pressure difference value is greater than or equal to a preset rail pressure threshold value or not;
if the absolute value of the rail pressure difference value is judged to be larger than or equal to a preset rail pressure threshold value, determining that the static leakage exists in the oil sprayer;
the determining whether the engine is in the overRun state includes:
acquiring the fuel injection quantity and the engine rotating speed;
determining whether the engine speed is not 0 and determining whether the fuel injection quantity is 0;
and if the engine speed is not 0 and the fuel injection quantity is 0, determining that the engine is in an overRun state.
2. The method of claim 1, wherein said determining whether the engine is in a steady state comprises:
acquiring the fuel injection quantity and the engine rotating speed;
determining whether the fuel injection quantity is within a preset fuel injection quantity range or not, and determining whether the rotating speed of the engine is within a preset rotating speed range or not;
and if the fuel injection quantity is within the preset fuel injection quantity range and the rotating speed of the engine is within the preset rotating speed range, determining that the engine is in a steady state.
3. The method of claim 1, wherein prior to determining whether the engine is in a steady state condition, further comprising:
determining whether a fault exists in a fuel system of an engine;
if it is determined that there is no fault with the engine fuel system, the step of determining whether the engine is in a steady state condition is performed.
4. The method of claim 3, further comprising:
and if the engine is determined not to be in the steady state, returning to the step of determining whether the fuel system of the engine has a fault.
5. A static leak measurement device for a fuel injector, comprising:
a first determination unit for determining whether the engine is in a steady state;
the high-pressure common rail system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a first rail pressure value in the high-pressure common rail system when the engine is determined to be in a steady state;
the first determination unit is further used for determining whether the engine is in an overRun state;
the obtaining unit is further used for obtaining a second rail pressure value in the high-pressure common rail system when the engine is determined to be in an overRun state;
a calculation unit configured to calculate a rail pressure difference value between the first rail pressure value and the second rail pressure value;
the judging unit is used for judging whether the absolute value of the rail pressure difference value is larger than or equal to a preset rail pressure threshold value or not;
the second determining unit is used for determining that the static leakage exists in the oil injector when the absolute value of the rail pressure difference value is judged to be larger than or equal to a preset rail pressure threshold value;
the first determination unit further includes:
a third determining subunit, configured to determine whether the engine speed is not 0, and determine whether the fuel injection amount is 0;
and the fourth determining subunit is used for determining that the engine is in an overRun state when the engine speed is determined to be not 0 and the fuel injection quantity is 0.
6. The apparatus according to claim 5, wherein the first determining unit comprises:
the acquisition subunit is used for acquiring the fuel injection quantity and the engine rotating speed;
the first determining subunit is used for determining whether the fuel injection quantity is within a preset fuel injection quantity range and determining whether the engine rotating speed is within a preset rotating speed range;
and the second determining subunit is used for determining that the engine is in a steady state when the fuel injection quantity is determined to be within the preset fuel injection quantity range and the engine speed is determined to be within the preset speed range.
7. The apparatus of claim 5, further comprising:
a third determination unit for determining whether there is a fault in the engine fuel system; the first determination unit is invoked upon determining that there is no fault with the engine fuel system.
8. A static leak measurement system for a fuel injector, comprising:
the static leak measurement device of any of claims 5-7;
a high pressure common rail system connected to the static leakage measuring device; the high-pressure common rail system at least comprises a high-pressure oil pump, a common rail pipe and an oil injector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910711969.2A CN110219759B (en) | 2019-08-02 | 2019-08-02 | Static leakage measuring method, device and system of oil sprayer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910711969.2A CN110219759B (en) | 2019-08-02 | 2019-08-02 | Static leakage measuring method, device and system of oil sprayer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110219759A CN110219759A (en) | 2019-09-10 |
| CN110219759B true CN110219759B (en) | 2020-01-03 |
Family
ID=67812663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910711969.2A Active CN110219759B (en) | 2019-08-02 | 2019-08-02 | Static leakage measuring method, device and system of oil sprayer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110219759B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110714847A (en) * | 2019-09-29 | 2020-01-21 | 潍柴西港新能源动力有限公司 | Leakage detection method for gas supply system of natural gas engine |
| CN110848064B (en) * | 2019-10-31 | 2021-04-16 | 河南百川畅银环保能源股份有限公司 | Device and method for testing oil injection condition of oil injection nozzle in generator set target test |
| CN111691999A (en) * | 2020-06-23 | 2020-09-22 | 潍柴动力股份有限公司 | Method and device for diagnosing leakage of common rail system |
| CN113405746A (en) * | 2021-06-30 | 2021-09-17 | 东风商用车有限公司 | Leakage fault diagnosis method and device for oil rail pressure release valve |
| CN113586302A (en) * | 2021-07-29 | 2021-11-02 | 北京工业大学 | Method for detecting valve tightness based on pressure drop characteristics |
| CN117685120A (en) * | 2024-02-04 | 2024-03-12 | 潍柴动力股份有限公司 | Fault detection method, device, equipment and medium for common rail system of engine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708202A (en) * | 1995-06-15 | 1998-01-13 | Mercedes-Benz Ag | Method of recognizing operating errors in a fuel injection system of an internal combustion engine |
| CN101506504A (en) * | 2006-08-21 | 2009-08-12 | 卡特彼勒公司 | System for dynamically detecting fuel leakage |
| CN101566100A (en) * | 2008-04-22 | 2009-10-28 | 福特环球技术公司 | Fuel delivery system diagnostics after shut-down |
| CN102996311A (en) * | 2012-12-04 | 2013-03-27 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Method and system for diagnosing oil return failure of electronic control common rail oil sprayer |
| CN101688491B (en) * | 2007-06-22 | 2013-05-29 | 欧陆汽车有限责任公司 | Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine |
| CN105003372A (en) * | 2015-06-15 | 2015-10-28 | 天津大学 | Oil spraying quantity fault diagnosis method based on rail pressure waveform characteristic parameter observation |
| CN106460706A (en) * | 2014-09-15 | 2017-02-22 | 宝马股份公司 | Method for detecting defective injection nozzles of an internal combustion engine |
| CN108930622A (en) * | 2017-05-23 | 2018-12-04 | 宝山钢铁股份有限公司 | Mobile diesel engine high pressure branch pressure universal diagnostic device and diagnostic method |
-
2019
- 2019-08-02 CN CN201910711969.2A patent/CN110219759B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708202A (en) * | 1995-06-15 | 1998-01-13 | Mercedes-Benz Ag | Method of recognizing operating errors in a fuel injection system of an internal combustion engine |
| CN101506504A (en) * | 2006-08-21 | 2009-08-12 | 卡特彼勒公司 | System for dynamically detecting fuel leakage |
| CN101688491B (en) * | 2007-06-22 | 2013-05-29 | 欧陆汽车有限责任公司 | Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine |
| CN101566100A (en) * | 2008-04-22 | 2009-10-28 | 福特环球技术公司 | Fuel delivery system diagnostics after shut-down |
| CN102996311A (en) * | 2012-12-04 | 2013-03-27 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Method and system for diagnosing oil return failure of electronic control common rail oil sprayer |
| CN106460706A (en) * | 2014-09-15 | 2017-02-22 | 宝马股份公司 | Method for detecting defective injection nozzles of an internal combustion engine |
| CN105003372A (en) * | 2015-06-15 | 2015-10-28 | 天津大学 | Oil spraying quantity fault diagnosis method based on rail pressure waveform characteristic parameter observation |
| CN108930622A (en) * | 2017-05-23 | 2018-12-04 | 宝山钢铁股份有限公司 | Mobile diesel engine high pressure branch pressure universal diagnostic device and diagnostic method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110219759A (en) | 2019-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110219759B (en) | Static leakage measuring method, device and system of oil sprayer | |
| US11459970B2 (en) | Fuel leak detection system | |
| CN110671176B (en) | Carbon capacity calculation method and calculation module based on oxygen concentration change | |
| CN110273786B (en) | Gas pipeline leakage detection method and device and engine system | |
| US20080190177A1 (en) | Throttle inlet absolute air pressure sensor for dirty air filter detection | |
| JP2008180123A (en) | Diagnostic device of internal combustion engine | |
| CN105257417B (en) | The fault detection method of rail pressure sensor in common rail system | |
| CN107110037B (en) | Fault detection system for low pressure exhaust gas recirculation circuit of internal combustion engine | |
| CN110715710B (en) | Liquid level meter fault detection method and device | |
| JP2013072375A (en) | Pressure sensor diagnosing method and common rail fuel injection control apparatus | |
| CN109340007B (en) | Oil injector blockage judging method and device | |
| US7966864B2 (en) | Method for ascertaining an ethanol content of a fuel | |
| CN110529249B (en) | Throttle valve abnormality detection method and apparatus | |
| EP1186775A2 (en) | Method for detecting leakage in a fuel rail | |
| EP0796988B1 (en) | Method of diagnosing the efficiency of an exhaust gas stoichiometric composition sensor placed downstream of a catalytic converter | |
| US8047046B2 (en) | Systems and method for monitoring urea level | |
| CN111022184B (en) | Fault detection method and device | |
| CN110631835B (en) | Supercharging pressure credibility detection method and device | |
| US10352234B2 (en) | Engine control apparatus | |
| JP2014084754A (en) | Rail pressure sensor output characteristic diagnostic method, and common rail-type fuel injection control device | |
| US7305872B2 (en) | Method for operating an internal combustion engine | |
| EP3085946A1 (en) | Control device for internal combustion engine | |
| CN109236467B (en) | Method and device for detecting power shortage of engine | |
| JP2011247205A (en) | Fuel supply device of internal combustion engine | |
| JP2011099343A (en) | Failure diagnostic device of fuel pressure sensor |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |