CN112963280B - Method for detecting state of air injection valve - Google Patents
Method for detecting state of air injection valve Download PDFInfo
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- CN112963280B CN112963280B CN202110309506.0A CN202110309506A CN112963280B CN 112963280 B CN112963280 B CN 112963280B CN 202110309506 A CN202110309506 A CN 202110309506A CN 112963280 B CN112963280 B CN 112963280B
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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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- 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
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- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to the technical field of detection of an air injection valve, and discloses a state detection method of the air injection valve, which comprises the following steps: s1, when the engine is decelerated and fuel cut-off, judging whether the operation condition of the engine and the state detection device of the jet valve meet the inlet conditions, and if so, entering S2; if not, exiting the detection program; s2, closing the pressure reducer, the stop valve and the air injection valve, applying an initial electrification pulse width to one air injection valve, acquiring the pressure difference of the air rail before and after the air injection valve is electrified, and increasing the initial electrification pulse width until the pressure difference is larger than the preset standard pressure difference; s3, if k is larger than the leakage preset threshold and smaller than the blockage preset threshold, the air injection valve is normal; otherwise, the gas injection valve is leaked or blocked. The method for detecting the state of the gas injection valve can detect whether the gas injection valve is blocked or leaked even if the characteristics of all the gas injection valves generate uniform drift.
Description
Technical Field
The invention relates to the technical field of detection of an air injection valve, in particular to a state detection method of the air injection valve.
Background
The gas engine uses the burning of substitute fuel such as natural gas introduced by the jet valve as the power source, and the state of the jet valve is normal or not in the using process, which is directly related to the safe and stable operation of the engine. Meanwhile, according to market application feedback information, the faults of the jet valve are common faults of a gas engine, and the fault modes of the jet valve are two in general, one is that the gas source is not clean, the carried impurities are not captured by a filter in time, so that the air nozzle of the jet valve is blocked, and the other is that the jet valve inevitably has valve member abrasion in the perennial work, so that the conical surface of the valve body is not tightly sealed, and the jet valve is leaked. Both of these failure modes are likely to occur at any time during use, and therefore, real-time detection of the state of the gas injection valve is essential.
In order to better detect the state of the gas injection valve, the gas injection valve is driven by a given electrified pulse width, the pressure change rate of gas in a gas rail before and after the gas injection valve injects is calculated, the average value of the pressure change rate of all the gas injection valves is further obtained, and finally the pressure change rate of each gas injection valve is compared with the average value, so that whether the gas injection valve generates characteristic change or not is determined. Once all the gas nozzles are blocked or leaked consistently, the method cannot be used for judging whether the state of the gas nozzles is normal or not, so that the method for detecting the state of the gas nozzles has defects.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for detecting a state of a gas injection valve, which can detect whether the gas injection valve is clogged or leaked, even if the characteristics of all the gas injection valves are uniformly shifted.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of detecting a condition of a gas injection valve, comprising:
s1, when the engine is in a deceleration fuel cut-off state, judging whether the current running condition of the engine and the state detection device of the jet valve meet the inlet condition detected by the jet valve, and if the current running condition of the engine and the state detection device of the jet valve meet the inlet condition, entering S2; if not, exiting the detection program;
s2, closing a pressure reducer, a stop valve and all the gas valves of the state detection device of the gas valve, applying an initial electrification pulse width on the gas valve to be detected, acquiring the pressure difference of the gas in the gas rail before and after the gas valve is electrified, comparing the pressure difference with a preset standard pressure difference, if the pressure difference is smaller than the preset standard pressure difference, increasing the initial electrification pulse width to obtain an actual electrification pulse width, and calculating the pressure difference of the gas in the gas rail before and after the gas valve is electrified until the pressure difference is larger than the preset standard pressure difference;
s3, calculating a ratio k of the actual electrified pulse width to a standard pulse width, and if k is larger than a preset leakage threshold value of the air injection valve and is smaller than a preset blocking threshold value of the air injection valve, judging that the air injection valve works normally; if k is smaller than or equal to a preset leakage threshold value of the air injection valve, judging that the air injection valve leaks; and if k is larger than or equal to a preset blocking threshold value of the air injection valve, judging that the air injection valve is blocked.
As a preferable aspect of the state detection method of the gas injection valve, the inlet conditions include that the engine can normally operate, that the pressure of the gas in the gas rail is within a preset pressure range, and that the pressure reducer and the shutoff valve can be charged and de-charged.
As a preferable mode of the state detection method of the gas injection valve, the energization pulse width of the gas injection valve from the closed state to the open state is the initial energization pulse width.
As a preferable scheme of the method for detecting the state of the gas injection valve, in S2, on the basis of the initial energization pulse width, the initial energization pulse width is incremented by an amplitude value of a stepped energization pulse width each time to obtain an actual energization pulse width, and if the actual energization pulse width is greater than or equal to a preset energization pulse width, the detecting step is exited; and if the actual electrifying pulse width is smaller than the preset electrifying pulse width, calculating the pressure difference of the gas in the gas rail before and after the gas spraying valve is electrified.
As a preferred scheme of a state detection method of the gas injection valve, if the pressure difference is less than or equal to the preset standard pressure difference, continuing to increase the actual energization pulse width to obtain a new actual energization pulse width, and calculating again the pressure difference of the gas in the gas rail before and after the gas injection valve is energized;
if the pressure difference is greater than the preset standard pressure difference, the process proceeds to step S3.
As a preferable scheme of the state detection method of the gas injection valve, the preset energization pulse width is a maximum energization time period of the gas injection valve capable of working normally.
As a preferable mode of the state detection method of the gas injection valve, the preset standard pressure difference is a pressure difference of gas in the gas rail before and after the normal pulse width energization of the gas injection valve capable of normally operating.
As a preferable mode of the state detection method of the jet valve, in S3, when the jet valve is leaked or clogged, the engine alarms.
As a preferable mode of the method for detecting the state of the gas ejection valve, in S2, when the pressure difference between the gas in the gas rail before and after the gas ejection valve is energized is acquired, the pressure of the gas in the gas rail before and after the gas ejection valve is energized is first detected by a pressure detector, and then the pressure difference is calculated.
As a preferable mode of the method for detecting the state of the gas injection valve, in S2, when the pressure difference of the gas in the gas rail before and after the gas injection valve is energized is acquired, the temperature value of the gas in the gas rail before and after the gas injection valve is energized is first detected by the temperature detecting member, then the pressure of the gas in the gas rail is obtained from the temperature value, and then the pressure difference is calculated.
The invention has the beneficial effects that: the invention discloses a jet valve state detection method, which overcomes the defects of the existing jet valve state detection method, judges the working state of the jet valve by respectively comparing the ratio k of the actual electrified pulse width to the standard pulse width with the leakage preset threshold value of the jet valve and the blockage preset threshold value of the jet valve, thereby realizing the real-time dynamic detection of the existing state of the jet valve, further detecting the blockage of the jet valve caused by the blockage of an air nozzle or the leakage caused by the internal abrasion in time, avoiding the serious fault of an engine, even if the characteristics of all the jet valves generate consistent drift, still detecting whether the jet valve is blocked or leaked, in addition, detecting when the engine is in a deceleration fuel cut-off state, because the spark plug is not ignited, the gas can be directly discharged out of a cylinder, and the running cycle of the engine at this time and even later can not be influenced, the normal operation of the engine is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention 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 for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic view of a state detection device for an air injection valve according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting the condition of a gas injection valve according to an embodiment of the present invention;
fig. 3 is a specific flowchart of a method for detecting the state of a gas injection valve according to an embodiment of the present invention.
In the figure:
1. a gas source; 2. a pressure reducer; 3. a stop valve; 4. an air rail; 5. an air blast valve; 6. an air inlet pipe; 7. a detection member; 8. a controller; 100. an engine.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present embodiment provides a method for detecting a state of a gas injection valve, as shown in fig. 2, including:
s1, when the engine 100 is in the deceleration fuel cut-off state, judging whether the current operation condition of the engine 100 and the state detection device of the jet valve meet the inlet condition detected by the jet valve 5, and if the current operation condition and the state detection device of the jet valve meet the inlet condition, entering S2; if not, exiting the detection program;
s2, closing a pressure reducer 2 (shown in figure 1), a stop valve 3 (shown in figure 1) and all gas injection valves 5 (shown in figure 1) of a state detection device of the gas injection valves, applying an initial electrifying pulse width to one gas injection valve 5 to be detected, obtaining the pressure difference of gas in a gas rail 4 (shown in figure 1) before and after electrifying the gas injection valve 5, comparing the pressure difference with a preset standard pressure difference, if the pressure difference is smaller than the preset standard pressure difference, increasing the initial electrifying pulse width to obtain the actual electrifying pulse width, and calculating the pressure difference of the gas in the gas rail 4 before and after electrifying the gas injection valve 5 until the pressure difference is larger than the preset standard pressure difference;
s3, calculating the ratio k of the actual electrified pulse width to the standard pulse width, and if k is larger than the leakage preset threshold value of the air injection valve 5 and is smaller than the blockage preset threshold value of the air injection valve 5, judging that the air injection valve 5 works normally; if k is smaller than or equal to a preset leakage threshold value of the air injection valve 5, judging that the air injection valve 5 leaks; and if the k is greater than or equal to a preset blocking threshold value of the gas injection valve 5, judging that the gas injection valve 5 is blocked.
It should be noted that, as shown in fig. 1, the state detection device for the gas injection valve of the present embodiment includes a gas source 1, a pressure reducer 2, a stop valve 3, a gas rail 4, seven gas injection valves 5, and an air inlet pipe 6, which are sequentially communicated, an outlet of each gas injection valve 5 is communicated with the engine 100, a detection piece 7 is arranged on the gas rail 4, the detection piece 7 is used for detecting the pressure or temperature of gas in the gas rail 4, the gas source 1 is a gas tank, and gas is filled in the gas tank. Specifically, the decompressor 2 is responsible for decompressing high-pressure gas in the gas tank into low-pressure gas, and then the low-pressure gas enters the gas rail 4 through the stop valve 3, and if the pressure in the gas rail 4 reaches a specified pressure, the stop valve 3 may temporarily stop closing, temporarily stopping the gas delivery to the gas rail 4. The pressure of the gas in the gas rail 4 can be detected in real time by the detection piece 7, the gas rail 4 is connected to the upper end of the gas injection valve 5, the nozzle of the gas injection valve 5 is communicated with the gas inlet pipe 6, and the gas sprayed out from the nozzle enters the engine 100 after being mixed with the air in the gas inlet pipe 6. The number of the jet valves 5 is related to the number of cylinders of the engine 100, and in general, the larger the number of cylinders of the engine 100, the larger the number of the jet valves 5.
As shown in fig. 1, the state detection device of the jet valve further includes a controller 8, where the controller 8 is an Electronic Control Unit (ECU), and the ECU is electrically connected to the pressure reducer 2, the stop valve 3, the detector 7, and the jet valve 5, respectively, so as to operate the engine 100 under a proper operating condition.
The method for detecting the state of the gas injection valve provided by the embodiment overcomes the defects of the existing method for detecting the state of the gas injection valve, and judges the working state of the gas injection valve 5 by respectively comparing the ratio k of the actual electrified pulse width to the standard pulse width with the preset leakage threshold value of the gas injection valve 5 and the preset blockage threshold value of the gas injection valve 5, so as to realize real-time dynamic detection of the existing state of the gas injection valve 5, further timely detect the blockage of the gas injection valve 5 caused by the blockage of the gas nozzle or the leakage caused by internal abrasion, avoid serious faults of the engine 100, even if the characteristics of all the gas injection valves 5 generate consistent drift, still detect whether the gas injection valve 5 is blocked or leaked, in addition, the detection is carried out when the engine 100 is in a deceleration fuel cut-off state, because the spark plug is not ignited, the gas can be directly discharged out of the cylinder, the operation cycle of the engine 100 at this time and thereafter is not affected, and normal operation of the engine 100 is ensured.
The inlet conditions of the present embodiment include that the engine 100 can be normally operated, that the pressure of the gas in the gas rail 4 is within a preset pressure range, and that the pressure reducer 2 and the shutoff valve 3 can be charged and de-energized.
Specifically, as shown in fig. 3, step S1 of the present embodiment includes the following steps:
s11, judging whether the engine 100 normally operates, if the engine 100 abnormally operates, determining that a fault code of the engine 100 exists, and exiting a detection program; if the engine 100 is operating normally, the routine proceeds to step S12;
s12, judging whether the engine 100 is in a deceleration fuel cut-off state, if so, entering S13; otherwise, exiting the detection program;
s13, judging whether the pressure reducer 2 and the stop valve 3 can be electrified or not, and if so, entering S14; otherwise, exiting the detection program;
s14, judging whether the pressure of the gas in the gas rail 4 is within a preset pressure range, and if so, entering S2; otherwise, the detection procedure is exited.
Specifically, in S11, when the engine 100 is abnormally operated, indicating that the engine 100 is out of order, the electronic control system (e.g., ECU) of the vehicle may generate a fault code indicating that the engine 100 is out of order, and at this time, the detection of the jet valve 5 needs to be stopped; when the engine 100 is normally operated, the fault code does not exist, indicating that the engine 100 is not in fault, at which point the execution of step S12 may continue.
In S12, engine 100 is in the deceleration fuel cut state when jet valve 5 is detected, and the use of the vehicle is not affected. Because the spark plug is not ignited, the gas can be directly discharged out of the cylinder, the operation cycle of the engine 100 at this time and even later times can not be influenced, the normal operation of the engine 100 can be ensured, the operation is convenient, the principle is realized based on an algorithm, no additional hardware equipment is required to be added, the cost is low, and the method is suitable for popularization.
In S13, since the pressure reducer 2 and the stop valve 3 need to be operated in the subsequent step, determining whether or not the pressure reducer 2 and the stop valve 3 can be normally energized and de-energized can prevent the occurrence of a phenomenon in which the pressure reducer 2 and the stop valve 3 malfunction to cause inaccurate detection.
In S14, the subsequent detection is only performed if the pressure of the gas in the gas rail 4 is within the preset pressure range, otherwise, there is a possibility of detection deviation.
In S2, the decompressor 2, the shutoff valve 3, and all the gas valves 5 of the state detecting device for closing the gas valves are closed, and the gas rail 4 corresponds to a closed container, and thereafter, the change in the pressure of the gas in the gas rail 4 is related only to the opening of the gas valves 5 as long as the decompressor 2 and the shutoff valve 3 are not opened.
The detector 7 of the present embodiment is a pressure detector, and when the pressure difference of the gas in the gas rail 4 before and after the energization of the gas ejection valve 5 is acquired in S2, the pressure of the gas in the gas rail 4 before and after the energization of the gas ejection valve 5 is first detected by the pressure detector, and then the pressure difference is calculated.
In other embodiments, the detecting element 7 may also be a temperature detecting element, and in S2, when the pressure difference of the gas in the gas rail 4 before and after the gas injection valve 5 is powered on is obtained, the temperature value of the gas in the gas rail 4 before and after the gas injection valve 5 is powered on is first detected by the temperature detecting element, then the pressure of the gas in the gas rail 4 is obtained according to the temperature value, and then the pressure difference is calculated.
The energization pulse width of the gas injection valve 5 of the present embodiment from the closed state to the open state is the initial energization pulse width. The reason for this initial energization pulse width is that if the initial energization pulse width increases from zero, the entire detection process will be relatively slow; if an excessively large initial energization pulse width is selected, the pressure difference of the gas in the gas rail 4 before and after the gas injection valve 5 is energized is easily large and exceeds a preset standard pressure difference. In other embodiments, the initial power-on pulse width may also have other values, which are selected according to actual needs.
In S2, on the basis of the initial energization pulse width, incrementing the initial energization pulse width by the amplitude value of the stepped energization pulse width each time to obtain an actual energization pulse width, and if the actual energization pulse width is greater than or equal to a preset energization pulse width, exiting the detecting step; if the actual energization pulse width is smaller than the preset energization pulse width, the pressure difference of the gas in the gas rail 4 before and after the gas injection valve 5 is energized is calculated to obtain the pressure loss of the gas in the gas rail 4 caused by the opening of the gas injection valve 5. It should be noted that the preset energization pulse width is the maximum energization time period of the normally operable air injection valve 5, and once it is detected that the actual energization pulse width is greater than or equal to the preset energization pulse width, the detection step is exited. In general, an actual energization pulse width exceeding a preset energization pulse width may cause a circuit burn out of the gas injection valve 5, causing a malfunction of the gas injection valve 5, and therefore, a determination of the actual energization pulse width is required here to avoid unnecessary risks.
After the pressure difference of the gas in the gas rail 4 before and after the gas injection valve 5 is electrified is calculated, if the pressure difference is smaller than or equal to the preset standard pressure difference, continuously increasing the actual electrified pulse width to obtain a new actual electrified pulse width, and calculating the pressure difference of the gas in the gas rail 4 before and after the gas injection valve 5 is electrified again;
if the pressure difference is greater than the predetermined standard pressure difference, the process proceeds to step S3.
The preset standard pressure difference in the present embodiment is a pressure difference of the gas in the gas rail 4 before and after the normal pulse width energization of the gas injection valve 5 that can normally operate. The preset standard pressure difference is usually obtained by actual detection on a rack of the engine 100, and can also be obtained by calculation through a physical formula.
Specifically, as shown in fig. 3, step S2 of the present embodiment includes the following steps:
s21, a pressure reducer 2 of a state detection device for closing the air injection valves, a stop valve 3 and all the air injection valves 5;
s22, applying an initial energization pulse width to a gas injection valve 5 to be tested, acquiring the pressure difference of the gas in the gas rail 4 before and after the gas injection valve 5 is energized, comparing the pressure difference with a preset standard pressure difference, and if the pressure difference is smaller than the preset standard pressure difference, increasing the initial energization pulse width by the amplitude value of the stepping energization pulse width every time to obtain the actual energization pulse width;
s23, if the actual electrifying pulse width is larger than or equal to the preset electrifying pulse width, the detection step is quit; if the actual energization pulse width is smaller than the preset energization pulse width, calculating the pressure difference of the gas in the gas rail 4 before and after the gas injection valve 5 is energized, and performing step S24;
s24, if the pressure difference is larger than the preset standard pressure difference, the step S3 is executed; if the pressure difference is less than or equal to the preset standard pressure difference, the last actual energization pulse width is incremented by the amplitude value of the stepped energization pulse width each time to obtain a new actual energization pulse width, and the process returns to step S23.
In S3, when the jet valve 5 leaks or the jet valve 5 is clogged, it is determined that the jet valve 5 is malfunctioning, the engine 100 alarms, and the engine 100 is malfunctioning code to alert the driver that the jet valve 5 is malfunctioning. Specifically, the instrument panel of the engine 100 of the present embodiment indicates that the air injection valve 5 is blocked or leaked when the instrument panel is in the highlight state, and the driver can know whether the air injection valve 5 is blocked or leaked by looking at the lighting state of the instrument panel. In other embodiments, the driver may be reminded in other ways, specifically selected according to actual needs.
Specifically, as shown in fig. 3, step S3 of the present embodiment includes the following steps:
s31, calculating the ratio k of the actual electrified pulse width to the standard pulse width;
s32, if k is larger than a preset leakage threshold of the air injection valve 5 and is smaller than a preset blockage threshold of the air injection valve 5, judging that the air injection valve 5 works normally; if k is smaller than or equal to the preset leakage threshold of the jet valve 5, judging that the jet valve 5 leaks, and giving an alarm to the engine 100; if k is larger than or equal to the preset blocking threshold value of the air injection valve 5, the air injection valve 5 is judged to be blocked, and the engine 100 gives an alarm.
Through presetting the threshold value with the jam with k and revealing and predetermine the threshold value and compare, can learn the state of jet valve 5, in case jet valve 5 has broken down, the driver can in time know, and then maintains jet valve 5, guarantees engine 100's normal operating.
Specifically, as shown in fig. 3, the method for detecting the state of the gas injection valve of the present embodiment includes the steps of:
s11, judging whether the engine 100 normally operates, if the engine 100 abnormally operates, determining that a fault code of the engine 100 exists, and exiting a detection program; if the engine 100 is operating normally, the routine proceeds to step S12;
s12, judging whether the engine 100 is in a deceleration fuel cut-off state, if so, entering S13; otherwise, exiting the detection program;
s13, judging whether the pressure reducer 2 and the stop valve 3 can be electrified or not, and if so, entering S14; otherwise, exiting the detection program;
s14, judging whether the pressure of the gas in the gas rail 4 is within a preset pressure range, and if so, entering S21; otherwise, exiting the detection program;
s21, a pressure reducer 2 of a state detection device for closing the air injection valves, a stop valve 3 and all the air injection valves 5;
s22, applying an initial energization pulse width to a gas injection valve 5 to be tested, acquiring the pressure difference of the gas in the gas rail 4 before and after the gas injection valve 5 is energized, comparing the pressure difference with a preset standard pressure difference, and if the pressure difference is smaller than the preset standard pressure difference, increasing the initial energization pulse width by the amplitude value of the stepping energization pulse width every time to obtain the actual energization pulse width;
s23, if the actual electrifying pulse width is larger than or equal to the preset electrifying pulse width, the detection step is quit; if the actual energization pulse width is smaller than the preset energization pulse width, calculating the pressure difference of the gas in the gas rail 4 before and after the gas injection valve 5 is energized, and performing step S24;
s24, if the pressure difference is larger than the preset standard pressure difference, the step S31 is executed; if the pressure difference is less than or equal to the preset standard pressure difference, the last actual energization pulse width is incremented by the amplitude value of the stepped energization pulse width each time to obtain a new actual energization pulse width, and the process returns to step S23.
S31, calculating the ratio k of the actual electrified pulse width to the standard pulse width;
s32, if k is larger than a preset leakage threshold of the air injection valve 5 and is smaller than a preset blockage threshold of the air injection valve 5, judging that the air injection valve 5 works normally; if k is smaller than or equal to the preset leakage threshold of the jet valve 5, judging that the jet valve 5 leaks, and giving an alarm to the engine 100; if k is larger than or equal to the preset blocking threshold value of the air injection valve 5, the air injection valve 5 is judged to be blocked, and the engine 100 gives an alarm.
When the gas ejection valve 5 is detected by the method for detecting the state of the gas ejection valve according to the present embodiment, the gas ejection valve 5 is detected individually.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method of detecting a state of a gas injection valve, comprising:
s1, when the engine (100) is in a deceleration fuel cut-off state, judging whether the current running state of the engine (100) and the state detection device of the jet valve meet the inlet condition detected by the jet valve (5), and if the current running state of the engine (100) and the state detection device of the jet valve meet the inlet condition, entering S2; if not, exiting the detection program;
s2, closing a pressure reducer (2), a stop valve (3) and all the gas injection valves (5) of the state detection device of the gas injection valve, applying an initial electrification pulse width to one to-be-detected gas injection valve (5), obtaining the pressure difference of gas in a gas rail (4) before and after the gas injection valve (5) is electrified, comparing the pressure difference with a preset standard pressure difference, if the pressure difference is smaller than the preset standard pressure difference, increasing the initial electrification pulse width to obtain an actual electrification pulse width, and calculating the pressure difference of the gas in the gas rail (4) before and after the gas injection valve (5) is electrified until the pressure difference is larger than the preset standard pressure difference;
s3, calculating a ratio k of the actual electrified pulse width to a standard pulse width, and if k is larger than a preset leakage threshold of the air injection valve (5) and is smaller than a preset blockage threshold of the air injection valve (5), judging that the air injection valve (5) works normally; if k is smaller than or equal to a preset leakage threshold value of the gas injection valve (5), judging that the gas injection valve (5) leaks; and if k is larger than or equal to a preset blocking threshold value of the air injection valve (5), judging that the air injection valve (5) is blocked.
2. The method for detecting the state of a gas injection valve according to claim 1, characterized in that the inlet conditions include that the engine (100) can operate normally, the pressure of the gas in the gas rail (4) is within a preset pressure range, and that the pressure reducer (2) and the shutoff valve (3) can be charged and de-energized.
3. Method for detecting the state of a gas injector according to claim 1, characterized in that the pulse width of the energization of the gas injector (5) from the closed state into the open state is the initial energization pulse width.
4. The method for detecting the state of the gas injection valve according to claim 1, wherein in S2, on the basis of the initial energization pulse width, the initial energization pulse width is incremented by an amplitude value of a stepped energization pulse width each time to obtain the actual energization pulse width, and if the actual energization pulse width is greater than or equal to a preset energization pulse width, the detection step is exited; and if the actual electrifying pulse width is smaller than the preset electrifying pulse width, calculating the pressure difference of the gas in the gas rail (4) before and after the gas spraying valve (5) is electrified.
5. The method for detecting the state of the gas injection valve according to claim 4, wherein if the pressure difference is less than or equal to the preset standard pressure difference, the actual energization pulse width is continuously increased to obtain a new actual energization pulse width, and the pressure difference of the gas in the gas rail (4) before and after the gas injection valve (5) is energized is calculated again;
if the pressure difference is greater than the preset standard pressure difference, the process proceeds to step S3.
6. The method for detecting the state of a gas injection valve according to claim 4, characterized in that the preset energization pulse width is a maximum energization time period of the gas injection valve (5) capable of normal operation.
7. The method for detecting the state of a gas injection valve according to claim 1, wherein the preset standard pressure difference is a pressure difference of gas in the gas rail (4) before and after the normal pulse width energization of the gas injection valve (5) capable of normal operation.
8. The method for detecting the state of a gas injection valve according to claim 1, characterized in that the engine (100) alarms when the gas injection valve (5) leaks or is clogged in S3.
9. The method for detecting the state of the gas injection valve according to claim 1, wherein in S2, when the pressure difference of the gas in the gas rail (4) before and after the gas injection valve (5) is energized is acquired, the pressure of the gas in the gas rail (4) before and after the gas injection valve (5) is energized is first detected by a pressure detecting member, and then the pressure difference is calculated.
10. The method for detecting the state of a gas nozzle according to claim 1, wherein in step S2, when the pressure difference of the gas in the gas rail (4) before and after the gas nozzle (5) is energized is obtained, the temperature value of the gas in the gas rail (4) before and after the gas nozzle (5) is energized is first detected by a temperature detecting member, then the pressure of the gas in the gas rail (4) is obtained from the temperature value, and then the pressure difference is calculated.
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