CN106988945B - Fault diagnosis instrument and method for gas nozzle of diesel ignition type engine - Google Patents
Fault diagnosis instrument and method for gas nozzle of diesel ignition type engine Download PDFInfo
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- CN106988945B CN106988945B CN201710241007.6A CN201710241007A CN106988945B CN 106988945 B CN106988945 B CN 106988945B CN 201710241007 A CN201710241007 A CN 201710241007A CN 106988945 B CN106988945 B CN 106988945B
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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- Testing Of Engines (AREA)
Abstract
A fault diagnosis instrument for the gas nozzle of diesel ignition engine is composed of signal receiving module, mechanical or electric circuit fault diagnosis module, leakage fault diagnosis module and signal output module, which are electrically connected to the input terminals of engine speed sensor, gas rail pressure sensor and nozzle open-close state detector and the output terminals of said modules. The design can effectively realize the diagnosis of the nozzle mechanism, the circuit and the leakage fault.
Description
Technical Field
The invention belongs to the technical field of locomotive engines, and particularly relates to a fault diagnosis instrument and a fault diagnosis method for a gas nozzle of a diesel ignition engine, which are suitable for realizing the diagnosis of circuit, machinery and leakage faults of the nozzle.
Background
A diesel ignition type natural gas engine is a modification scheme which is frequently adopted for modifying a diesel engine into a natural gas engine. Compared with gasoline engines and DIESEL engines, DIESEL ignition natural gas engines have a very special combustion process, have the dual characteristics of DIESEL and OTTO circular combustion, and are coupled with each other. With the development of the automobile industry, the position of an online diagnosis system in a modern automobile service system is more and more important. The centralized fault diagnosis and information transmission are the main technical basis for fault diagnosis in vehicle maintenance, and are the embodiment of automobile standardization and integration.
The invention patent with Chinese patent application publication No. CN103670756A and application publication No. 2014, no. 3 and No. 26 discloses a CPLD-based gas electric control engine nozzle controller, which comprises a nozzle fault diagnosis module in the controller, wherein the nozzle fault real-time diagnosis module is used for taking a nozzle working current sampling value, a nozzle self-inductance voltage, a storage battery voltage and a nozzle enabling signal as input, and analyzing and processing to obtain whether the fault type of the nozzle is open circuit or short circuit. The device can only diagnose the circuit fault of the nozzle, and can not judge whether the nozzle has mechanical fault.
Disclosure of Invention
The invention aims to overcome the problem that the mechanical fault of a gas nozzle cannot be diagnosed in the prior art, and provides a fault diagnosis instrument and a fault diagnosis method for the gas nozzle of a diesel ignition engine, which can diagnose the mechanical and circuit faults of the gas nozzle.
In order to realize the purpose, the technical scheme of the invention is as follows:
the utility model provides a diesel oil ignition formula engine gas nozzle failure diagnosis appearance, be provided with signal reception module, machinery or circuit failure diagnosis module, signal output module in the diagnosis appearance, the input of signal reception module links with engine speed sensor, gas rail pressure sensor, nozzle open and close state detection device electricity, and the output of signal reception module links with the input electricity of signal output module through machinery or circuit failure diagnosis module.
The diagnostic apparatus is characterized in that a leakage fault diagnosis module is further arranged in the diagnostic apparatus, the input end of the leakage fault diagnosis module is electrically connected with the output end of the signal receiving module, and the output end of the leakage fault diagnosis module is electrically connected with the input end of the signal output module.
A diagnostic method of a fault diagnostic instrument of a gas nozzle of a diesel ignition engine comprises a mechanical or circuit fault diagnostic method;
the mechanical or circuit fault diagnosis method comprises the following steps: under the idle working condition of the engine, the signal receiving module receives detection signals from an engine speed sensor, an air rail pressure sensor and a nozzle opening and closing state detection device in real time, sends the detection signals to a mechanical or circuit fault diagnosis module, opens a certain nozzle and enables other nozzles to be in a closed state, then the mechanical or circuit fault diagnosis module compares and calculates the received detection signals before and after the nozzle is opened, diagnoses whether the nozzle has mechanical or circuit faults according to the calculation result, and finally sends the diagnosis result to the signal output module.
In the mechanical or circuit fault diagnosis method, diagnosing whether the nozzle has the mechanical or circuit fault according to the calculation result refers to:
if the opening and closing states of the nozzles before and after the nozzles are opened, the rotating speed of the engine and the pressure of the gas rail are all calculated to be unchanged, the circuit fault is diagnosed;
if the opening and closing states of the nozzle before and after the nozzle is opened are calculated to be changed, and the rotating speed of the engine and the pressure of the air rail are not changed, the mechanical fault is diagnosed;
if the open-close state of the nozzle is changed before and after the nozzle is opened, the engine speed is increased, and the air rail pressure is reduced, the diagnosis is made that no mechanical or circuit fault exists.
The fault diagnosis module also comprises a leakage fault diagnosis module, wherein the input end of the leakage fault diagnosis module is electrically connected with the signal receiving module, and the output end of the leakage fault diagnosis module is electrically connected with the signal output module;
the diagnostic method further comprises a leak fault diagnostic method;
the leakage fault diagnosis method comprises the following steps: under the idle working condition of the engine, the signal receiving module receives detection signals from an engine speed sensor, an air rail pressure sensor and a nozzle opening and closing state detection device in real time and sends the detection signals to the leakage fault diagnosis module, and then the leakage fault diagnosis module compares and diagnoses whether leakage faults exist in the nozzle according to the received detection signals within the time T and sends the diagnosis result to the signal output module.
In the leakage fault diagnosis method, the step of comparing and diagnosing whether the nozzle has the leakage fault according to the received detection signal within the time T is as follows:
if the opening and closing state of the nozzle is not changed, the rotating speed of the engine is increased, and the pressure of the air rail is reduced, the internal leakage fault is diagnosed;
if the open-close state of the nozzle and the rotating speed of the engine are not changed and the pressure of the air rail is reduced, the external leakage fault is diagnosed;
if the opening and closing state of the nozzle, the rotating speed of the engine and the pressure of the gas rail are all calculated to be unchanged, the leakage fault is diagnosed to be absent.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a fault diagnosis instrument for a gas nozzle of a diesel ignition engine and a diagnosis method thereof.A signal receiving module, a mechanical or circuit fault diagnosis module and a signal output module are arranged in the diagnosis instrument, the input end of the signal receiving module is electrically connected with an engine rotating speed sensor, a gas rail pressure sensor and a nozzle opening and closing state detection device, the output end of the signal receiving module is electrically connected with the input end of the signal output module through the mechanical or circuit fault diagnosis module, and under the idle working condition of the engine, the design inspects the front and back changes of three parameters of the engine rotating speed, the gas rail pressure and the nozzle opening and closing state after opening a certain nozzle and closing other nozzles, thereby not only diagnosing whether the nozzle has a mechanical or circuit fault, but also judging which nozzle has the fault, and obviously improving the detection efficiency of the nozzle. Thus, the present invention enables effective diagnosis of nozzle mechanical or electrical circuit failure.
2. The invention relates to a fault diagnosis instrument and a fault diagnosis method for a gas nozzle of a diesel ignition engine.A leakage fault diagnosis module is also arranged in the diagnosis instrument, the input end and the output end of the leakage fault diagnosis module are respectively and electrically connected with the output end of a signal receiving module and the input end of a signal output module, and when a nozzle is in a closed state, whether the nozzle has internal leakage or external leakage can be effectively judged by observing the change of the rotating speed of the engine and the pressure of an air rail in an idling working condition within the time T. Therefore, the present invention can realize the diagnosis of the nozzle leak failure.
Drawings
FIG. 1 is a block diagram of the present invention.
In the figure: the device comprises a signal receiving module 1, a mechanical or circuit fault diagnosis module 2, a leakage fault diagnosis module 3, a signal output module 4, an engine rotating speed sensor 5, an air rail pressure sensor 6 and a nozzle opening and closing state detection device 7.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description of the invention.
Referring to fig. 1, a fault diagnosis instrument for a gas nozzle of a diesel ignition engine is provided with a signal receiving module 1, a mechanical or circuit fault diagnosis module 2 and a signal output module 4, wherein the input end of the signal receiving module 1 is electrically connected with an engine speed sensor 5, an air rail pressure sensor 6 and a nozzle opening and closing state detection device 7, and the output end of the signal receiving module 1 is electrically connected with the input end of the signal output module 4 through the mechanical or circuit fault diagnosis module 2.
And a leakage fault diagnosis module 3 is further arranged in the diagnostic instrument, the input end of the leakage fault diagnosis module 3 is electrically connected with the output end of the signal receiving module 1, and the output end of the leakage fault diagnosis module 3 is electrically connected with the input end of the signal output module 4.
A diagnostic method of a fault diagnostic instrument of a gas nozzle of a diesel ignition engine comprises a mechanical or circuit fault diagnostic method;
the mechanical or circuit fault diagnosis method comprises the following steps: under the idle working condition of the engine, the signal receiving module 1 receives detection signals from an engine speed sensor 5, an air rail pressure sensor 6 and a nozzle opening and closing state detection device 7 in real time, sends the detection signals to the mechanical or circuit fault diagnosis module 2, opens a certain nozzle and enables other nozzles to be in a closed state, then the mechanical or circuit fault diagnosis module 2 carries out comparison calculation on the received detection signals before and after the nozzle is opened, diagnoses whether the nozzle has mechanical or circuit faults according to the calculation result, and finally sends the diagnosis result to the signal output module 4.
In the mechanical or circuit fault diagnosis method, diagnosing whether the nozzle has the mechanical or circuit fault according to the calculation result refers to:
if the opening and closing states of the nozzle before and after the nozzle is opened, the rotating speed of the engine and the pressure of the gas rail are not changed, the circuit fault is diagnosed;
if the opening and closing states of the nozzle before and after the nozzle is opened are calculated to be changed, and the rotating speed of the engine and the pressure of the air rail are not changed, the mechanical fault is diagnosed;
if the open-close state of the nozzle is changed before and after the nozzle is opened, the rotating speed of the engine is increased, and the pressure of the air rail is reduced, the engine is diagnosed as having no mechanical or circuit fault.
The fault diagnosis module 2 further comprises a leakage fault diagnosis module 3, wherein the input end of the leakage fault diagnosis module 3 is electrically connected with the signal receiving module 1, and the output end of the leakage fault diagnosis module 3 is electrically connected with the signal output module 4;
the diagnostic method further comprises a leak fault diagnostic method;
the leakage fault diagnosis method comprises the following steps: under the idle working condition of the engine, the signal receiving module 1 receives detection signals from the engine speed sensor 5, the air rail pressure sensor 6 and the nozzle opening and closing state detection device 7 in real time and sends the detection signals to the leakage fault diagnosis module 3, and then the leakage fault diagnosis module 3 compares and diagnoses whether the nozzle has leakage faults according to the received detection signals within the time T and sends the diagnosis result to the signal output module 4.
In the leakage fault diagnosis method, the step of comparing and diagnosing whether the nozzle has the leakage fault according to the received detection signal within the time T is as follows:
if the opening and closing state of the nozzle is not changed, the rotating speed of the engine is increased, and the pressure of the air rail is reduced, the internal leakage fault is diagnosed;
if the open-close state of the nozzle and the rotating speed of the engine are not changed and the pressure of the air rail is reduced, the external leakage fault is diagnosed;
if the opening and closing state of the nozzle, the rotating speed of the engine and the pressure of the gas rail are all calculated to be unchanged, the leakage fault is diagnosed to be absent.
The principle of the invention is illustrated as follows:
when a mechanical fault (such as injection port blockage) or leakage fault exists in a gas nozzle, whether the nozzle works or not can be judged only by pulling out a nozzle connector, while the gas nozzle of a diesel pilot-fired engine adopts single-point injection, the nozzle does not work in an idling state, and the state of the nozzle cannot be detected by using a traditional nozzle connector pulling-out method. Therefore, the invention provides a fault diagnosis instrument and a fault diagnosis method for a gas nozzle of a diesel ignition engine, which are used for effectively judging whether the nozzle has circuit, mechanical or leakage faults or not by simultaneously inspecting the change of three parameters, namely the rotating speed of the engine, the pressure of an air rail and the opening and closing state of the nozzle.
Example 1:
referring to fig. 1, a fault diagnosis instrument for a gas nozzle of a diesel ignition engine is provided with a signal receiving module 1, a mechanical or circuit fault diagnosis module 2, a leakage fault diagnosis module 3 and a signal output module 4, wherein the input end of the signal receiving module 1 is electrically connected with an engine speed sensor 5, a gas rail pressure sensor 6 and a nozzle opening and closing state detection device 7, the output end of the signal receiving module 1 is electrically connected with the input end of the signal output module 4 through the mechanical or circuit fault diagnosis module 2, and the output end of the signal receiving module 1 is electrically connected with the input end of the signal output module 4 through the leakage fault diagnosis module 3.
A diagnostic method of a fault diagnostic instrument for a gas nozzle of a diesel ignition engine comprises a mechanical or circuit fault diagnostic method and a leakage fault diagnostic method;
the mechanical or circuit fault diagnosis method comprises the following steps: under the idle condition of the engine, the signal receiving module 1 receives detection signals (the engine speed is 700rpm, the air rail pressure is 520Kpa, and the nozzle is in a closed state) from the engine speed sensor 5, the air rail pressure sensor 6 and the nozzle opening and closing state detection device 7 in real time, sends the detection signals to the mechanical or circuit fault diagnosis module 2, opens a certain nozzle, enables other seven nozzles to be in a closed state, and sets the injection time to be 10ms, then the mechanical or circuit fault diagnosis module 2 compares the received detection signals after the nozzle is opened (the engine speed is 700rpm, the air rail pressure is 505Kpa, and the nozzle is in an open state) with the detection signals before the nozzle is opened (the air rail pressure is 520Kpa, and the nozzle is in a closed state), finds that the engine speed is increased by 16rpm, the air rail pressure is decreased by 15Kpa, and the nozzle is changed from the closed state to the open state, so that the nozzle is diagnosed to work normally, and no mechanical or circuit fault exists, and finally sends the diagnosis result to the output module 4.
The leakage fault diagnosis method comprises the following steps: under the idle working condition of the engine, the signal receiving module 1 receives detection signals from the engine speed sensor 5, the air rail pressure sensor 6 and the nozzle opening and closing state detection device 7 in real time and sends the detection signals to the leakage fault diagnosis module 3, then the leakage fault diagnosis module 3 compares the received detection signals within 10ms to obtain that the nozzle opening and closing state and the engine speed are unchanged, the air rail pressure is reduced, therefore, an external leakage fault is diagnosed, and finally, the diagnosis result is sent to the signal output module 4.
Example 2:
step example 1, with the difference that:
in the mechanical or circuit fault diagnosis method, the mechanical or circuit fault diagnosis module 2 calculates whether the opening and closing states of the nozzle before and after the nozzle is opened, the rotating speed of an engine and the pressure of a gas rail are unchanged, and diagnoses the nozzle as a circuit fault.
In the leakage fault diagnosis method, the leakage fault diagnosis module 3 calculates that the opening and closing state of a nozzle, the rotating speed of an engine and the pressure of a gas rail are not changed, and diagnoses that no leakage fault exists.
Example 3:
step example 1, with the difference that:
in the mechanical or circuit fault diagnosis method, the mechanical or circuit fault diagnosis module 2 calculates that the opening and closing states of the nozzle before and after the nozzle is opened are changed, the rotating speed of an engine and the pressure of an air rail are not changed, and the mechanical or circuit fault is diagnosed as the mechanical fault.
In the leakage fault diagnosis method, the leakage fault diagnosis module 3 calculates that the opening and closing state of a nozzle is unchanged, the rotating speed of an engine is increased, the pressure of an air rail is reduced, and internal leakage faults are diagnosed.
Claims (4)
1. A diagnosis method of a fault diagnosis instrument for a gas nozzle of a diesel ignition engine is characterized by comprising the following steps:
the diagnostic instrument is internally provided with a signal receiving module (1), a mechanical or circuit fault diagnosis module (2) and a signal output module (4), wherein the input end of the signal receiving module (1) is electrically connected with an engine speed sensor (5), an air rail pressure sensor (6) and a nozzle opening and closing state detection device (7), and the output end of the signal receiving module (1) is electrically connected with the input end of the signal output module (4) through the mechanical or circuit fault diagnosis module (2);
the diagnosis method comprises a mechanical or circuit fault diagnosis method;
the mechanical or circuit fault diagnosis method comprises the following steps: under the idle working condition of an engine, the signal receiving module (1) receives detection signals from an engine speed sensor (5), an air rail pressure sensor (6) and a nozzle opening and closing state detection device (7) in real time, sends the detection signals to the mechanical or circuit fault diagnosis module (2), opens a certain nozzle, enables other nozzles to be in a closed state, then the mechanical or circuit fault diagnosis module (2) compares and calculates the received detection signals before and after the nozzle is opened, diagnoses whether the nozzle has mechanical or circuit faults according to the calculation result, and finally sends the diagnosis result to the signal output module (4).
2. The diagnostic method of the fault diagnostic instrument for the gas nozzle of the diesel ignition engine according to claim 1, characterized in that:
in the mechanical or circuit fault diagnosis method, diagnosing whether the nozzle has the mechanical or circuit fault according to the calculation result refers to:
if the opening and closing states of the nozzle before and after the nozzle is opened, the rotating speed of the engine and the pressure of the gas rail are not changed, the circuit fault is diagnosed;
if the opening and closing states of the nozzle before and after the nozzle is opened are calculated to be changed, and the rotating speed of the engine and the pressure of the air rail are not changed, the mechanical fault is diagnosed;
if the open-close state of the nozzle is changed before and after the nozzle is opened, the rotating speed of the engine is increased, and the pressure of the air rail is reduced, the engine is diagnosed as having no mechanical or circuit fault.
3. The diagnostic method of the fault diagnostic instrument for the gas nozzle of the diesel ignition engine according to claim 1, characterized in that:
the fault diagnosis module (2) further comprises a leakage fault diagnosis module (3), the input end of the leakage fault diagnosis module (3) is electrically connected with the signal receiving module (1), and the output end of the leakage fault diagnosis module (3) is electrically connected with the signal output module (4);
the diagnostic method further comprises a leak fault diagnostic method;
the leakage fault diagnosis method comprises the following steps: under the idle working condition of the engine, the signal receiving module (1) receives detection signals from the engine speed sensor (5), the air rail pressure sensor (6) and the nozzle opening and closing state detection device (7) in real time and sends the detection signals to the leakage fault diagnosis module (3), and then the leakage fault diagnosis module (3) compares and diagnoses whether leakage faults exist in the nozzle according to the received detection signals within the time T and sends a diagnosis result to the signal output module (4).
4. The diagnostic method of the fault diagnostic instrument for the gas nozzle of the diesel ignition engine according to claim 3, characterized in that:
in the leakage fault diagnosis method, the step of comparing and diagnosing whether the nozzle has the leakage fault according to the received detection signal within the time T is as follows:
if the opening and closing state of the nozzle is not changed, the rotating speed of the engine is increased, and the pressure of the air rail is reduced, the internal leakage fault is diagnosed;
if the opening and closing state of the nozzle and the rotating speed of the engine are not changed and the pressure of the air rail is reduced, the external leakage fault is diagnosed;
if the opening and closing state of the nozzle, the rotating speed of the engine and the pressure of the gas rail are calculated to be unchanged, the leakage fault is diagnosed to be absent.
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| CN201710241007.6A CN106988945B (en) | 2017-04-13 | 2017-04-13 | Fault diagnosis instrument and method for gas nozzle of diesel ignition type engine |
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| CN112283000B (en) * | 2020-10-29 | 2022-01-25 | 潍柴动力股份有限公司 | Method and device for detecting internal leakage of fuel gas injection valve of engine |
| CN112943429B (en) * | 2021-02-05 | 2022-03-11 | 广西玉柴机器股份有限公司 | Engine aftertreatment HC injection system diagnosis method capable of avoiding air influence |
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| JPH06264803A (en) * | 1993-03-11 | 1994-09-20 | Toyota Motor Corp | Abnormality diagnostic device of fuel injection device |
| WO2011073175A1 (en) * | 2009-12-14 | 2011-06-23 | Spheretech International | Diagnostic method for a diesel engine |
| JP2011153610A (en) * | 2010-01-28 | 2011-08-11 | Toyota Motor Corp | Injection abnormality detection device |
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