CN114704399A - Intake pressure credibility diagnosis method and device, vehicle and storage medium - Google Patents
Intake pressure credibility diagnosis method and device, vehicle and storage medium Download PDFInfo
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- CN114704399A CN114704399A CN202210330575.4A CN202210330575A CN114704399A CN 114704399 A CN114704399 A CN 114704399A CN 202210330575 A CN202210330575 A CN 202210330575A CN 114704399 A CN114704399 A CN 114704399A
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- intake pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10373—Sensors for intake systems
Abstract
The invention relates to the technical field of vehicles, and particularly discloses an intake pressure credibility diagnosis method, an intake pressure credibility diagnosis device, a vehicle and a storage medium, wherein the intake pressure credibility diagnosis method comprises the steps of judging and determining that an engine enters a small-load working condition and then calibrating the small-load working condition to be 1 after the engine is started; meanwhile, judging and determining that the calibration large-load working condition is 1 after the engine enters the large-load working condition; meanwhile, actual intake pressure is obtained, and if the actual intake pressure is larger than an upper limit threshold, the upper limit threshold is updated to the value of the actual intake pressure; if the actual intake pressure is less than the lower threshold, updating the lower threshold to the value of the actual intake pressure; when it is determined that the large load condition is 1 and the small load condition is 1, whether the intake pressure sensor is authentic is diagnosed based on the difference between the upper threshold and the lower threshold to avoid the detection value of the intake pressure sensor from affecting the entire driving cycle when the engine is stationary.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to an intake pressure credibility diagnosis method and device, a vehicle and a storage medium.
Background
The air inlet pressure of the diesel engine is closely related to the air inlet quantity, specifically, the air inlet quantity and the fuel injection quantity meet the lean burn relationship, when the fuel injection quantity is too large, the engine is easy to smoke, and when the fuel injection quantity is too small, the engine is easy to have insufficient power. Therefore, the air inlet pressure is an important parameter for adjusting the oil injection quantity, the air inlet pressure needs to be detected through the air inlet pressure sensor, and the accuracy of the detection value of the air inlet pressure sensor is guaranteed to be very important.
Normally, the accuracy of the detection value of the intake pressure sensor is affected to a small extent by the external environment, but in cold weather, the measurement value of the intake pressure sensor is easily misaligned due to freezing of condensed water on the intake pressure sensor, and therefore, the value detected by the intake pressure sensor when the engine of the vehicle is not started after the ECU is initialized is not trusted. However, after the vehicle is started, the ice on the surface of the intake pressure sensor is gradually ablated along with the flow of the gas, and the detection value of the intake pressure sensor is gradually restored to normal. However, the existing diagnostic method can only detect when the engine is at rest, if the detection value of the intake pressure sensor is misaligned in cold weather, and the engine is out of the rotating speed rest condition, the diagnostic result is not updated, and the use of the intake pressure in the whole driving cycle is influenced.
Disclosure of Invention
The invention aims to: the method and the device for diagnosing the reliability of the intake pressure, the vehicle and the storage medium are provided, so that the problems that in the related art, the initial detection value is easily lost after an intake pressure sensor is frozen in cold weather, the detection value cannot be updated after an engine is started, and the use of the intake pressure in the whole driving cycle is influenced are solved.
The invention provides an intake pressure credibility diagnosis method, which comprises the following steps:
s100: starting the engine;
s110: and performing engine state evaluation in real time, wherein the engine state evaluation comprises the following steps:
judging whether the engine enters a small-load working condition or not, and calibrating the small-load working condition to be 1 if the engine enters the small-load working condition;
judging whether the engine enters a large-load working condition or not, and calibrating the large-load working condition to be 1 if the engine enters the large-load working condition;
acquiring actual intake pressure, and updating an upper threshold value to a numerical value of the actual intake pressure if the actual intake pressure is greater than the upper threshold value; if the actual intake pressure is less than a lower threshold, updating the lower threshold to the value of the actual intake pressure;
s120: determining that a large-load working condition is 1 and a small-load working condition is 1;
s130: and diagnosing whether the intake air pressure sensor is authentic based on a difference between the upper threshold and the lower threshold.
As a preferred technical solution of the intake pressure credibility diagnosis method, in S110, if the engine does not enter a low-load working condition; or the engine does not enter a large-load working condition; alternatively, S110 is executed again if the actual intake pressure is between the upper threshold and the lower threshold.
As a preferable aspect of the intake air pressure reliability diagnosis method, diagnosing whether the intake air pressure sensor is reliable based on a difference between the upper threshold and the lower threshold includes:
judging whether the difference value exceeds a set value or not;
if yes, the intake pressure sensor is credible; if not, the intake pressure sensor is not credible.
As a preferred technical scheme of the intake pressure credibility diagnosis method, the step of judging whether the engine enters a small-load working condition comprises the following steps:
acquiring the rotating speed of the engine;
acquiring the fuel injection quantity of the engine;
acquiring a communication state of the air inlet pressure sensor;
and when the rotating speed is less than a first set rotating speed, the fuel injection quantity is less than a first set fuel injection quantity, and the communication state of the air inlet pressure sensor is normal, determining that the engine enters a low-load working condition.
As a preferable technical solution of the intake pressure reliability diagnosis method, when the rotation speed is not less than a first set rotation speed; or the fuel injection quantity is not less than a first set fuel injection quantity; or when the communication state of the air inlet pressure sensor is abnormal, determining that the engine does not enter a small-load working condition.
As a preferred technical scheme of the intake pressure credibility diagnosis method, the step of judging whether the engine enters a large-load working condition comprises the following steps:
acquiring the rotating speed of the engine;
acquiring the fuel injection quantity of the engine;
acquiring the communication state of the air inlet pressure sensor;
and when the rotating speed is greater than a second set rotating speed, the fuel injection quantity is greater than a second set fuel injection quantity, and the communication state of the air inlet pressure sensor is normal, determining that the engine enters a large-load working condition.
As a preferable technical solution of the intake pressure credibility diagnosis method, when the rotation speed is not greater than a second set rotation speed; or the fuel injection quantity is not more than a second set fuel injection quantity; or when the communication state of the air inlet pressure sensor is abnormal, determining that the engine does not enter a large-load working condition.
The present invention also provides an intake pressure reliability diagnosis apparatus including:
a starting module for starting the engine;
the small-load working condition judging module is used for judging whether the engine enters a small-load working condition or not;
the small-load working condition calibration unit is used for calibrating the small-load working condition to be 1 when the engine enters the small-load working condition;
the large-load working condition judgment module is used for judging whether the engine enters a large-load working condition or not;
the large-load working condition calibration unit is used for calibrating the large-load working condition to be 1 when the engine enters the large-load working condition;
an intake pressure acquisition unit for acquiring an actual intake pressure;
the air inlet pressure judging unit is used for judging the sizes of the actual air inlet pressure and the upper limit threshold value and the lower limit threshold value;
an upper limit threshold updating unit configured to update the upper limit threshold to a value of the actual intake air pressure when the actual intake air pressure is greater than the upper limit threshold;
a lower limit threshold updating unit configured to update the lower limit threshold to a value of an actual intake air pressure when the actual intake air pressure is smaller than the lower limit threshold;
the determining unit is used for determining that the large-load working condition is 1 and the small-load working condition is 1;
and the diagnosis module is used for diagnosing whether the intake pressure sensor is credible or not based on the difference value of the upper limit threshold and the lower limit threshold.
The present invention also provides a vehicle including an engine, and an intake pressure sensor provided in an intake duct of the engine, the intake pressure sensor being configured to detect an actual intake pressure of the intake duct, the vehicle further including:
the air inlet pressure sensor is used for sending detected actual air inlet pressure to the driving controller;
the rotating speed sensor is used for detecting the rotating speed of the engine and sending the detected rotating speed to the driving controller;
the fuel quantity sensor is used for detecting the fuel injection quantity of the engine and sending the detected fuel injection quantity to the driving controller;
a memory for storing one or more programs;
when the one or more programs are executed by the traveling controller, the traveling controller is caused to control the vehicle to implement the intake pressure credibility diagnosis method as described in any one of the above aspects.
The present invention also provides a storage medium having stored thereon a computer program that, when executed by a vehicle controller, a vehicle implements an intake pressure plausibility diagnosis method as described in any one of the above aspects.
The invention has the beneficial effects that:
the invention provides an intake pressure credibility diagnostic method, an intake pressure credibility diagnostic device, a vehicle and a storage medium, wherein the intake pressure credibility diagnostic method is characterized in that after an engine is started, the engine state is evaluated in real time, namely whether the engine enters a small-load working condition or not is judged, and if the engine enters the small-load working condition, the small-load working condition is calibrated and set as 1; meanwhile, judging whether the engine enters a large-load working condition or not, and calibrating the large-load working condition to be 1 if the engine enters the large-load working condition; meanwhile, actual intake pressure is obtained, and if the actual intake pressure is larger than an upper limit threshold, the upper limit threshold is updated to the value of the actual intake pressure; if the actual intake pressure is less than the lower threshold, updating the lower threshold to the value of the actual intake pressure; when it is determined that the large load condition is 1 and the small load condition is 1, it is diagnosed whether the intake pressure sensor is authentic based on the difference between the upper and lower limit thresholds, so as to avoid the detection value of the intake pressure sensor from affecting the entire driving cycle when the engine is stationary.
Drawings
FIG. 1 is a flow chart of a method for diagnosing the plausibility of intake pressure in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an intake pressure reliability diagnosis apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a vehicle in the embodiment of the invention.
In the figure:
200. a start module; 210. a small load working condition judgment module; 220. a small load working condition calibration unit; 230. a large-load working condition judgment module; 240. a large-load working condition calibration unit; 250. an intake air pressure acquisition unit; 260. an intake pressure determination unit; 270. an upper threshold updating unit; 271. a lower threshold updating unit; 280. a determination unit; 290. a diagnostic module;
300. an engine; 310. an intake air pressure sensor; 320. a driving controller; 330. a rotational speed sensor; 340. an oil quantity sensor; 350. a memory.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral 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.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Example one
In general, the accuracy of the detection value of the intake pressure sensor is affected to a small extent by the external environment, but in cold weather, the measurement value of the intake pressure sensor is likely to be largely misaligned due to freezing of condensed water on the intake pressure sensor, and therefore, the value detected by the intake pressure sensor when the engine of the vehicle is not started after the ECU is initialized is not trusted. However, after the vehicle is started, the ice on the surface of the intake pressure sensor is gradually ablated along with the flow of the gas, and the detection value of the intake pressure sensor is gradually restored to normal. However, the existing diagnostic method can only detect when the engine is at rest, if the detection value of the intake pressure sensor is misaligned in cold weather, and the engine is out of the rotating speed rest condition, the diagnostic result is not updated, and the use of the intake pressure in the whole driving cycle is influenced.
Therefore, the present embodiment provides an intake pressure credibility diagnosis method, which can be used for performing credibility diagnosis on the accuracy of the intake pressure detected by the intake pressure sensor after the engine normally operates, so as to avoid that the detection result is incorrect due to icing of the intake pressure sensor during the period when the engine speed is stationary, thereby further affecting the whole driving cycle. The intake pressure reliability diagnostic method may be implemented by an intake pressure reliability diagnostic device that is implemented by software and/or hardware and integrated in a vehicle, and specifically, as shown in fig. 1, the intake pressure reliability diagnostic method includes the steps of:
s100: the engine is started.
S110: and performing engine state evaluation in real time, wherein the engine state evaluation comprises steps S111-S113.
S111: judging whether the engine enters a small-load working condition or not, if so, calibrating the small-load working condition to be 1, and continuing to execute S120; if the engine does not enter the low-load working condition, S110 is executed again.
After the engine is started, various working conditions can be met along with the running of the engine, and when the engine does not enter a small-load working condition, the small-load working condition is calibrated to be 0; when the engine enters a low-load working condition for the first time, the calibration value is changed from 0 to 1, and the engine is locked; when the engine exits the light load condition, the calibration value is maintained at 1 and does not change.
Specifically, determining whether the engine enters a low load condition comprises:
acquiring the rotating speed of an engine; acquiring the fuel injection quantity of an engine; acquiring a communication state of an air inlet pressure sensor; when the rotating speed is less than a first set rotating speed, the fuel injection quantity is less than a first set fuel injection quantity, and the communication state of the air inlet pressure sensor is normal, determining that the engine enters a low-load working condition; when the rotating speed is not less than the first set rotating speed; or the fuel injection quantity is not less than the first set fuel injection quantity; or when the communication state of the air inlet pressure sensor is abnormal, determining that the engine does not enter a small load working condition.
Since the engine speed and the fuel injection amount can determine the output torque of the engine, the load state of the engine can be determined. The rotating speed of the engine can be detected by a rotating speed sensor, the oil injection quantity of the engine can be detected by an oil quantity sensor, and both the first set rotating speed and the first set oil injection quantity can be preset in a running controller. The communication state of the air inlet pressure sensor is up to whether the air inlet pressure sensor can normally send the detection result to the vehicle controller, if the vehicle controller can receive the value detected by the air inlet pressure sensor, the communication state of the air inlet pressure sensor is normal, otherwise, the communication state of the air inlet pressure sensor is abnormal.
S112: judging whether the engine enters a large-load working condition or not, if so, calibrating the large-load working condition to be 1, and continuing to execute S120; if the engine does not enter the large-load working condition, S110 is executed again.
Like step S111, when the engine has not yet entered the high-load operating condition, the calibration high-load operating condition is set to 0 at this time; when the engine enters a large-load working condition for the first time, the calibration value is changed from 0 to 1, and the engine is locked; when the engine exits from the high-load working condition, the calibration value is kept to be 1 and is not changed any more.
Specifically, determining whether the engine enters a high load condition comprises: acquiring the rotating speed of an engine; acquiring the fuel injection quantity of an engine; acquiring a communication state of an air inlet pressure sensor; and when the rotating speed is greater than a second set rotating speed, the fuel injection quantity is greater than a second set fuel injection quantity, and the communication state of the air inlet pressure sensor is normal, determining that the engine enters a large-load working condition. When the rotating speed is not greater than the second set rotating speed; or the fuel injection quantity is not greater than a second set fuel injection quantity; or when the communication state of the air inlet pressure sensor is abnormal, determining that the engine does not enter a large-load working condition.
And the second set rotating speed and the second set fuel injection quantity can be preset in the driving controller. In addition, in this embodiment, the second set rotation speed is greater than the first set rotation speed, and the second set fuel injection amount is greater than the first set fuel injection amount.
S113: acquiring actual intake pressure, if the actual intake pressure is greater than an upper limit threshold, updating the upper limit threshold to a numerical value of the actual intake pressure, and continuing to execute S120; if the actual intake pressure is smaller than the lower limit threshold, updating the lower limit threshold to the value of the actual intake pressure, and continuing to execute S120; if the actual intake pressure is between the upper threshold and the lower threshold, S110 is executed again.
In which the actual intake pressure may be obtained by the intake pressure sensor, the upper threshold and the lower threshold are pre-stored in the controller, and the pre-stored upper threshold and lower threshold may be continuously corrected according to the actual intake pressure during the operation of the engine in step S113.
S120: and determining that the large-load working condition is 1 and the small-load working condition is 1.
Specifically, the calibration value of the large load condition and the calibration value of the small load condition are obtained in real time, and when the calibration value of the large load condition is 1 and the calibration value of the small load condition is 1, S120 is determined.
S130: whether the intake air pressure sensor is authentic is diagnosed based on the difference between the upper threshold value and the lower threshold value.
When step S120 is executed, it indicates that the engine has first entered one of the small-load condition and the large-load condition at this time, and has entered the other of the small-load condition and the large-load condition. With this as the time node, in step S130, the difference is made between the upper limit threshold and the lower limit threshold after the engine is started and this time node, and then the difference is used to diagnose whether the intake pressure sensor is authentic.
Specifically, step S130 includes: judging whether the difference value exceeds a set value or not; if yes, the intake pressure sensor is credible; if not, the intake pressure sensor is not credible.
In the embodiment, the difference value is compared with the set value to evaluate whether the intake pressure sensor is credible, if the difference value exceeds the set value, the actual intake pressure can fluctuate in a large range, the detection value of the intake pressure sensor does not influence the whole driving cycle when the engine is static, and the intake pressure sensor is credible. If the difference does not exceed the set value, it means that the actual intake pressure can fluctuate only within a small range, and the detection value of the intake pressure sensor while the engine is stationary has affected the entire driving cycle, and the intake pressure sensor is not reliable.
When the intake pressure sensor is judged to be unreliable, an alarm can be sent out to remind a driver.
According to the intake pressure credibility diagnosis method provided by the embodiment, after the engine is started, the engine state is evaluated in real time, namely whether the engine enters a small load working condition or not is judged, and if the engine enters the small load working condition, the small load working condition is calibrated to be 1; meanwhile, judging whether the engine enters a large-load working condition or not, and calibrating the large-load working condition to be 1 if the engine enters the large-load working condition; meanwhile, actual intake pressure is obtained, and if the actual intake pressure is larger than an upper limit threshold, the upper limit threshold is updated to the value of the actual intake pressure; if the actual intake pressure is less than the lower threshold, updating the lower threshold to the value of the actual intake pressure; when it is determined that the large-load operation condition is set to 1 and the small-load operation condition is set to 1, it is diagnosed whether the intake pressure sensor is authentic based on a difference between the upper and lower threshold values. In order to avoid the detection value of the intake pressure sensor from affecting the entire driving cycle when the engine is stationary.
Example two
The present embodiment provides an intake pressure reliability diagnostic device for implementing the above-described intake pressure reliability diagnostic method. Specifically, as shown in fig. 2, the intake pressure reliability diagnosis device includes: the system comprises a starting module 200, a small-load working condition judging module 210, a small-load working condition calibrating unit 220, a large-load working condition judging module 230, a large-load working condition calibrating unit 240, an intake air pressure obtaining unit 250, an intake air pressure judging unit 260, an upper limit threshold updating unit 270, a lower limit threshold updating unit 271, a determining unit 280 and a diagnosing module 290. Wherein the starting module 200 is used to start the engine; the small-load working condition judgment module 210 is used for judging whether the engine enters a small-load working condition or not; the small-load working condition calibration unit 220 is used for calibrating the small-load working condition to be 1 when the engine enters the small-load working condition; the large-load working condition judgment module 230 is used for judging whether the engine enters a large-load working condition; the large-load working condition calibration unit 240 is configured to calibrate the large-load working condition to be 1 when the engine enters the large-load working condition; the intake pressure acquisition unit 250 is configured to acquire an actual intake pressure; the intake pressure judging unit 260 is used for judging the actual intake pressure and the size of the upper limit threshold value and the lower limit threshold value; the upper limit threshold updating unit 270 is configured to update the upper limit threshold to a value of the actual intake air pressure when the actual intake air pressure is greater than the upper limit threshold; the lower limit threshold updating unit 271 is configured to update the lower limit threshold to a value of the actual intake air pressure when the actual intake air pressure is smaller than the lower limit threshold; the determining unit 280 is configured to determine that the large load operating condition is 1 and the small load operating condition is 1; the diagnostic module 290 is configured to diagnose whether the intake air pressure sensor is authentic based on a difference between the upper threshold and the lower threshold.
Optionally, the small load condition determining module 210 includes:
and the first rotating speed acquisition unit is used for acquiring the rotating speed of the engine.
And the first fuel injection quantity acquisition unit is used for acquiring the fuel injection quantity of the engine.
And the first communication state acquisition unit is used for acquiring the communication state of the intake pressure sensor.
And the first determining unit is used for determining that the engine enters a low-load working condition when the rotating speed is less than a first set rotating speed, the fuel injection quantity is less than a first set fuel injection quantity, and the communication state of the air inlet pressure sensor is normal.
Optionally, the large load condition determining module 230 includes:
and the second rotating speed acquisition unit is used for acquiring the rotating speed of the engine.
And the second fuel injection quantity acquisition unit is used for acquiring the fuel injection quantity of the engine.
And the second communication state acquisition unit is used for acquiring the communication state of the intake pressure sensor.
And the second determining unit is used for determining that the engine enters a high-load working condition when the rotating speed is greater than a second set rotating speed, the fuel injection quantity is greater than a second set fuel injection quantity, and the communication state of the intake pressure sensor is normal.
The intake pressure reliability diagnosis device provided by the second embodiment of the invention can be used for executing the intake pressure reliability diagnosis method provided by the first embodiment, and has corresponding functions and beneficial effects.
EXAMPLE III
The present embodiment provides a vehicle, specifically, as shown in fig. 3, the vehicle includes an engine 300, an intake air pressure sensor 310, a traveling controller 320, a rotational speed sensor 330, an oil amount sensor 340, and a memory 350. The engine 300, the intake pressure sensor 310, the traveling controller 320, the rotational speed sensor 330, the oil amount sensor 340, and the memory 350 are connected by a bus. An intake pressure sensor 310 is provided in an intake duct of the engine 300, the intake pressure sensor 310 is configured to detect an actual intake pressure of the intake duct, and the intake pressure sensor 310 transmits the detected actual intake pressure to the vehicle controller 320; the rotation speed sensor 330 is configured to detect a rotation speed of the engine 300 and transmit the detected rotation speed to the vehicle controller 320; the oil amount sensor 340 is configured to detect an amount of fuel injected into the engine 300 and transmit the detected amount of fuel injected to the vehicle controller 320.
The memory 350 is used as a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the intake pressure reliability diagnosis method according to the embodiment of the present invention. The traveling controller 320 executes various functional applications and data processing of the vehicle, that is, implements the intake pressure plausibility diagnosis method of the above-described embodiment, by executing software programs, instructions, and modules stored in the memory 350.
The memory 350 mainly includes a program storage area and a data storage area, wherein the program storage area can store an operating system and an application program required by at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 350 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 350 may further include memory located remotely from the vehicle controller, which may be connected to the vehicle over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The vehicle according to the fourth embodiment of the present invention is the same as the intake pressure reliability diagnostic method according to the first embodiment of the present invention, and the details of the intake pressure reliability diagnostic method that are not described in detail in the present embodiment can be referred to in the above embodiments.
Example four
A storage medium is further provided in an embodiment of the present invention, and the storage medium stores thereon a computer program, which when executed by a vehicle controller implements the intake pressure plausibility diagnosis method according to the above-described embodiment of the present invention.
Of course, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the operations in the intake pressure credibility diagnosis method described above, and may also perform related operations in the intake pressure credibility diagnosis method provided by the embodiment of the present invention, and have corresponding functions and advantages.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes instructions for enabling a computer device (which may be a robot, a personal computer, a server, or a network device) to execute the intake pressure credibility diagnosis method according to the embodiments of the present invention. It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An intake pressure reliability diagnostic method, characterized by comprising:
s100: starting the engine;
s110: and performing engine state evaluation in real time, wherein the engine state evaluation comprises the following steps:
judging whether the engine enters a small-load working condition or not, and calibrating the small-load working condition to be 1 if the engine enters the small-load working condition;
judging whether the engine enters a large-load working condition or not, and calibrating the large-load working condition to be 1 if the engine enters the large-load working condition;
acquiring actual intake pressure, and updating an upper threshold value to a numerical value of the actual intake pressure if the actual intake pressure is greater than the upper threshold value; if the actual intake pressure is less than a lower threshold, updating the lower threshold to a value of the actual intake pressure;
s120: determining that a large-load working condition is 1 and a small-load working condition is 1;
s130: and diagnosing whether the intake air pressure sensor is authentic based on a difference between the upper threshold and the lower threshold.
2. The intake-pressure reliability diagnostic method according to claim 1, wherein in S110, if the engine does not enter a low-load condition; or the engine does not enter a large-load working condition; alternatively, S110 is executed again if the actual intake pressure is between the upper threshold and the lower threshold.
3. The intake-air pressure credibility diagnostic method according to claim 1, wherein diagnosing whether the intake-air pressure sensor is credible based on the difference between the upper threshold and the lower threshold includes:
judging whether the difference value exceeds a set value or not;
if yes, the intake pressure sensor is credible; if not, the intake pressure sensor is not credible.
4. The intake-pressure reliability diagnostic method according to claim 1, wherein determining whether the engine enters a light-load condition includes:
acquiring the rotating speed of the engine;
acquiring the fuel injection quantity of the engine;
acquiring a communication state of the air inlet pressure sensor;
and when the rotating speed is less than a first set rotating speed, the fuel injection quantity is less than a first set fuel injection quantity, and the communication state of the air inlet pressure sensor is normal, determining that the engine enters a low-load working condition.
5. The intake-pressure reliability diagnostic method according to claim 4, characterized in that when the rotation speed is not less than a first set rotation speed; or the fuel injection quantity is not less than a first set fuel injection quantity; or when the communication state of the air inlet pressure sensor is abnormal, determining that the engine does not enter a small-load working condition.
6. The intake-pressure reliability diagnostic method according to claim 1, wherein determining whether the engine enters a heavy-load condition includes:
acquiring the rotating speed of the engine;
acquiring the fuel injection quantity of the engine;
acquiring a communication state of the air inlet pressure sensor;
and when the rotating speed is greater than a second set rotating speed, the fuel injection quantity is greater than a second set fuel injection quantity, and the communication state of the air inlet pressure sensor is normal, determining that the engine enters a large-load working condition.
7. The intake-pressure reliability diagnostic method according to claim 6, characterized in that when the rotation speed is not greater than a second set rotation speed; or the fuel injection quantity is not greater than a second set fuel injection quantity; or when the communication state of the air inlet pressure sensor is abnormal, determining that the engine does not enter a large-load working condition.
8. An intake pressure reliability diagnostic device characterized by comprising:
a starting module for starting the engine;
the small-load working condition judging module is used for judging whether the engine enters a small-load working condition or not;
the small-load working condition calibration unit is used for calibrating the small-load working condition to be 1 when the engine enters the small-load working condition;
the large-load working condition judgment module is used for judging whether the engine enters a large-load working condition or not;
the large-load working condition calibration unit is used for calibrating the large-load working condition to be 1 when the engine enters the large-load working condition;
an intake pressure acquisition unit for acquiring an actual intake pressure;
the air inlet pressure judging unit is used for judging the sizes of the actual air inlet pressure and the upper limit threshold value and the lower limit threshold value;
an upper limit threshold updating unit configured to update the upper limit threshold to a value of an actual intake air pressure when the actual intake air pressure is greater than the upper limit threshold;
a lower limit threshold updating unit configured to update the lower limit threshold to a value of the actual intake air pressure when the actual intake air pressure is smaller than the lower limit threshold;
the determining unit is used for determining that the large-load working condition is 1 and the small-load working condition is 1;
and the diagnosis module is used for diagnosing whether the intake pressure sensor is credible or not based on the difference value of the upper limit threshold and the lower limit threshold.
9. A vehicle, includes the engine, and set up in the intake pressure sensor of the intake duct of engine, intake pressure sensor is used for detecting the actual intake pressure of intake duct, its characterized in that still includes:
the air inlet pressure sensor is used for sending detected actual air inlet pressure to the driving controller;
the rotating speed sensor is used for detecting the rotating speed of the engine and sending the detected rotating speed to the driving controller;
the fuel quantity sensor is used for detecting the fuel injection quantity of the engine and sending the detected fuel injection quantity to the driving controller;
a memory for storing one or more programs;
when the one or more programs are executed by the traveling vehicle controller, the traveling vehicle controller is caused to control a vehicle to implement the intake pressure plausibility diagnosis method according to any one of claims 1 to 7.
10. A storage medium having a computer program stored thereon, wherein the program, when executed by a vehicle controller, causes a vehicle to implement the intake pressure plausibility diagnosis method according to any one of claims 1 to 7.
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| CN114704399B (en) | 2023-01-06 |
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