CN115977821A

CN115977821A - Method for detecting failure of single injector, computer program product and controller

Info

Publication number: CN115977821A
Application number: CN202111196546.5A
Authority: CN
Inventors: 孙旭东; 吴佳迪; 李佩文; 贡建雄; 陆嘉伟
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2023-04-18
Also published as: DE102022209989A1

Abstract

The invention provides a method for detecting the failure of a single ejector in the running process of a vehicle, which comprises the working condition detection step of detecting the running working condition of the vehicle; a specific working condition selection step of comparing the operation working condition with a predefined specific working condition set; a power-on timing step, wherein when the operation working condition is matched with a certain working condition in the predefined specific working condition set, the actual power-on duration of the single injector is obtained; a comparison step, comparing the actual power-on time length with a predefined theoretical power-on time length under the specific working condition; a judging step, if the difference between the actual power-on time length and the theoretical power-on time length exceeds a predefined drift threshold value, judging that the single injector fails; and a warning step, providing warning information of the failure of the single injector. The method can be used for providing warning for the failed single injector.

Description

Method for detecting failure of single injector, computer program product and controller

Technical Field

The invention relates to a diesel common rail system, in particular to a method for detecting the failure of a single injector in the running process of a vehicle, a computer program product for completing the detection method and a controller.

Background

Injectors are used to inject fuel at a pressure into the combustion chambers of an internal combustion engine so that the combustion does work to provide power. Under different operating conditions, the vehicle has a certain power demand, and therefore the amount of fuel required for combustion is also relatively fixed, for example during idling or during driving at a certain speed on a motorway. Therefore, in this condition, the fuel injected into the combustion chamber needs to be stabilized as well, and the amount of fuel injection is determined by the injection amount per unit time and the energization period.

However, during use of the injector, the injection amount of the injector per unit time may be unstable due to wear or other reasons. If it is due to wear, it causes the injector to inject an amount of fuel per unit time greater than the theoretical injection amount, and if it is due to clogging, it causes the injector to inject an amount of fuel per unit time less than the theoretical injection amount. If the predetermined power-up period is maintained, fuel injected into the combustion chamber may be out of demand, resulting in under-or over-power, and in severe cases, combustion chamber burnout.

Disclosure of Invention

The object of the present invention is to provide a method for detecting a failure of a single injector during operation of a vehicle, as well as a controller and a computer program product for carrying out the method.

To achieve the above object, the present invention provides a method for detecting a failure of a single injector during operation of a vehicle, comprising the steps of:

a working condition detection step, which is used for detecting the running working condition of the vehicle;

selecting a specific working condition, and comparing the operating working condition with a predefined specific working condition set;

a power-on timing step, when the operation working condition is matched with one specific working condition in the predefined specific working condition set, acquiring the actual power-on time length of the single injector;

a comparison step, comparing the actual power-on time length with a predefined theoretical power-on time length under the specific working condition;

a judging step, if the difference between the actual power-on time length and the theoretical power-on time length exceeds a predefined drift threshold value, judging that the single injector fails;

and a warning step, providing warning information of the failure of the single injector.

The present invention further provides a controller for controlling a single injector and detecting a failure of the single injector during operation of a vehicle, the controller being configured to perform the method for detecting a failure of a single injector as described above.

The present invention also provides a computer program product stored on a non-volatile readable storage medium, which when executed, may implement the method for detecting a single injector failure as described above.

By using the technical scheme provided by the invention, when the power-on time of the single injector exceeds the set drift threshold, the failure warning information is provided.

Drawings

Exemplary embodiments of the present application will be described in detail below with reference to the attached drawings, it being understood that the following description of the embodiments is only for the purpose of explanation and not limitation of the scope of the present application, and in the accompanying drawings:

FIG. 1 is a flow chart of one embodiment of a method of detecting single injector failure in accordance with the present invention.

Detailed Description

It should be understood that the drawings are for illustrative purposes only and are not intended to limit the application.

The method for detecting the failure of the single injector in the running process of the vehicle takes the injector of the common rail system of the diesel engine vehicle as an embodiment for explanation. The common rail system has injectors connected to the common rail and with pressure equal to that of the common rail, and the common rail provides high pressure fuel oil to inject into the combustion chamber of the internal combustion engine for combustion to produce work. Diesel engine vehicles are required to provide a stable power output under certain steady state conditions, and therefore, the amount of fuel that needs to be injected into the combustion chamber is also certain. In the case where a certain drift occurs in the injection quantity per unit time of the injector, the controller controlling the injector compensates for the drift by adjusting the power-on period of the injector, which is monitored in real time during the injection of the injector. The controller is generally an engine controller installed in a vehicle, but it may also be integrated into a vehicle controller or uploaded to the cloud. The controller may be comprised of electronic components, and may be comprised of computer program functional modules. The controller predefines a plurality of information for controlling and monitoring the operation of the injector in a calibration mode, including the operation condition information of the vehicle, and the specific stable operation state of the vehicle is defined as a certain operation condition through the operation condition information. The method also has information of predefined specific working conditions, wherein the specific working conditions refer to the applicable operating conditions for the method for detecting the failure of the single injector, and particularly refer to the specific working conditions including the idling working conditions in the vehicle warming state. The information of the plurality of specific conditions forms a specific condition set. The predefined theoretical power-up period refers to the power-up period required to achieve a predetermined injection under certain operating conditions, and the predefined drift threshold refers to the maximum amount of drift in the power-up period of a single injector that is acceptable in the present invention, including increased power-up periods and/or decreased power-up periods. The single injection quantity and injection pressure are also predefined in the controller under this specific condition. It will of course be appreciated that other influencing factors may also have an influence on the required injection quantity of the vehicle in a certain driving situation, for example the influencing factors include whether the air conditioner is on, the ambient pressure, all parts of the generator situation. In some embodiments including the present embodiment, the specific operating condition is a specific operating condition that distinguishes different influence factors, that is, the influence factors are different, and even if the injection amount and the injection pressure are the same, the specific operating condition is defined as different. The above-mentioned predefined information may be obtained through experiments or calculations or experience.

Referring to fig. 1, the method for detecting a failure of a single injector during the operation of a vehicle according to the present invention first performs a working condition detection step S01, and a controller detects the operation working condition of the vehicle. After the operating conditions have been determined, a particular condition selection step S02 is performed, i.e. the operating conditions are compared with a predefined set of particular conditions. And then, performing a power-on timing step S03, wherein when the operating working condition is matched with one specific working condition in the predefined specific working condition set, the actual power-on time length of the single injector is obtained through the controller. In the next comparison step S04, the actual power-on duration is compared with the predefined theoretical power-on duration under the specific condition. In the judging step S05, if the difference between the actual power-on time length and the theoretical power-on time length exceeds a predefined drift threshold value, the single injector is judged to be failed. In some embodiments, including the present embodiment, the drift threshold is set to 10% of the theoretical charging period, that is, if the difference between the actual charging period and the theoretical charging period is greater than 10/% of the theoretical charging period, the single injector is determined to be failed. Finally, in the warning step S06, the controller provides failure and warning information of the single injector, where the warning information includes information of the position and/or drift amount of the single injector. The position information can specifically indicate which injector is to be warned, and the drift amount information can be a specific value of the drift amount or a ratio to a theoretical power-on time period.

From the above, the controller of the present application is used for controlling the single injector and detecting the failure of the single injector during the operation of the vehicle, and has the predefined information required for performing the function therein, and is capable of controlling the injector to perform the above detection method. The detection method can be realized by a computer program product and is stored in a nonvolatile readable storage medium.

The present application is described in detail above with reference to specific embodiments. It is to be understood that both the foregoing description and the embodiments shown in the drawings are to be considered exemplary and not restrictive of the application. It will be apparent to those skilled in the art that various changes or modifications may be made therein without departing from the spirit of the application, and these changes or modifications do not depart from the scope of the application.

Claims

1. A method for detecting the failure of a single injector in the running process of a vehicle comprises the following steps:

a working condition detection step (S01) for detecting the running working condition of the vehicle;

a specific working condition selection step (S02) for comparing the operating working conditions with a predefined specific working condition set;

an electrification timing step (S03) for acquiring the actual electrification time length of the single injector when the operation working condition is matched with a certain working condition in the predefined specific working condition set;

a comparison step (S04) for comparing the actual power-on time length with a predefined theoretical power-on time length under the specific working condition;

a judging step (S05) of judging that the single injector fails if the difference between the actual power-on time length and the theoretical power-on time length exceeds a predefined drift threshold;

and a warning step (S06) of providing warning information of the failure of the single injector.

2. A method of detecting a single injector failure as claimed in claim 1, wherein the specific operating condition is a steady state operating condition.

3. A method of detecting a malfunction of a single injector as claimed in claim 2, wherein the specific operating condition includes an idle operating condition in a warm state.

4. A method for detecting a failure of a single ejector as in claim 2, wherein the specific operating condition is one that distinguishes between influencing factors, the influencing factors including one or more of whether an air conditioner is on, ambient pressure, and generator status.

5. A method of detecting a single injector failure as claimed in claim 1, wherein said drift threshold is 10% of the theoretical power-up duration.

6. A method for detecting a failure of a single injector as claimed in claim 1, wherein the warning message comprises information on the position and/or drift of the single injector.

7. A method for detecting single injector failure as claimed in claim 1, 2, 3, 4 or 5 wherein said single injector injects at a predefined single injection quantity and a predefined injection pressure under said specific operating condition.

8. A method of detecting a single injector failure as claimed in claim 7, wherein one or more of said predefined operating conditions, a predefined set of specified conditions, a predefined theoretical energization period, a predefined drift threshold, a predefined single injection quantity and a predefined injection pressure are pre-stored in a calibrated manner in a controller controlling said single injector.

9. A controller for controlling a single injector and detecting a failure of the single injector during operation of a vehicle, wherein the controller is configured to perform a method of detecting a failure of the single injector as claimed in any one of claims 1 to 8.

10. A computer program product stored on a non-transitory readable storage medium and operable to implement a method of detecting a failure of a single injector as claimed in any one of claims 1 to 8.