CN117782420A - Engine manifold pressure detection method, device, electronic equipment and storage medium - Google Patents
Engine manifold pressure detection method, device, electronic equipment and storage medium Download PDFInfo
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Abstract
The application provides an engine manifold pressure detection method, an engine manifold pressure detection device, electronic equipment and a storage medium. The method comprises the following steps: after the vehicle is powered up, acquiring a data set related to manifold pressure of an engine of the vehicle; when the working state of the engine is an in-operation state, the rotating speed of the engine is greater than or equal to a minimum rotating speed threshold value, and the state information of the pressure sensor is a fault-free state, a target pressure threshold value corresponding to the current vehicle working condition is obtained; judging whether the measured value is abnormal or not based on the target pressure threshold value to obtain a judging result; and determining the effective pressure of the manifold according to the judging result. Therefore, when the pressure sensor does not have faults, but the pressure value measured by the pressure sensor is obviously different from the actual value of the manifold pressure under the current vehicle working condition, the measured value can be replaced by the model value, so that the accuracy of manifold pressure detection is improved, and the problem that the engine is flameout due to overlarge deviation between the measured value and the actual value of the manifold pressure is avoided.
Description
Technical Field
The invention relates to the technical field of engine electronic control management, in particular to an engine manifold pressure detection method, an engine manifold pressure detection device, electronic equipment and a storage medium.
Background
In current electronic engine control systems, a manifold pressure sensor acts as the main load sensor of the engine to sense and calculate the fresh air entering the cylinders. In the existing electronic control system, there are many diagnoses on the signals of the pressure sensor, such as sensor line diagnosis, signal reasonable range diagnosis, signal hysteresis diagnosis, etc. After diagnosing the corresponding faults, corresponding fault post-treatment measures are provided to ensure the safe operation of the engine. Currently, for handling after a pressure sensor failure, a simple rough alternative strategy is generally adopted. For example, when the pressure signal is not reasonable (less than the minimum value of the measurement range of the sensor or greater than the maximum value of the measurement range of the sensor), the signal is delayed, the line fault (the threshold value for judging the line fault is smaller than the minimum value of the measurement range of the sensor or greater than the maximum value of the measurement range) causes the manifold pressure signal to be unreliable, the manifold pressure predicted value is adopted for substitution. However, in practical applications, there are situations where the value of the manifold pressure sensor signal is within a reasonable signal range of the sensor for a short period of time, but is seriously inconsistent with the actual manifold pressure of the engine, at which point a fault cannot be triggered, and thus a pressure substitution strategy cannot be adopted. In addition, the engine is liable to stall due to an excessive deviation between the manifold pressure signal value and the actual value.
Disclosure of Invention
In view of the foregoing, an object of an embodiment of the present application is to provide an engine manifold pressure detection method, apparatus, electronic device, and storage medium, capable of improving the problem of manifold pressure detection inaccuracy.
In order to achieve the technical purpose, the technical scheme adopted by the application is as follows:
in a first aspect, embodiments of the present application provide an engine manifold pressure detection method, the method comprising:
after a vehicle is electrified, acquiring a data set related to manifold pressure of an engine of the vehicle, wherein the data set comprises a working state of the engine, a rotating speed of the engine, state information of a pressure sensor, current vehicle working conditions, a measured value obtained by the pressure sensor for collecting the pressure of the manifold and a model value obtained by calculating the pressure of the manifold;
when the working state of the engine is an in-operation state, the rotating speed of the engine is greater than or equal to a minimum rotating speed threshold value, and the state information of the pressure sensor is a fault-free state, a target pressure threshold value corresponding to the current vehicle working condition is obtained;
judging whether the measured value is abnormal or not based on the target pressure threshold value to obtain a judging result;
and determining the effective pressure of the manifold according to the judging result, wherein when the measured value is abnormal, the measured value is replaced by the model value to serve as the effective pressure.
With reference to the first aspect, in some optional embodiments, obtaining a target pressure threshold corresponding to a current vehicle condition includes:
when the current vehicle working condition is an idle working condition, a first MAP table corresponding to the idle working condition is obtained, and a first pressure threshold corresponding to the current engine speed and the current atmospheric pressure of the vehicle is obtained from the first MAP table to serve as the target pressure threshold, wherein the corresponding relation between the pressure threshold and the engine speed and the atmospheric pressure is recorded in the first MAP table;
when the current vehicle working condition is a sudden acceleration working condition, a second MAP table corresponding to the sudden acceleration working condition is obtained, and a second pressure threshold corresponding to the current engine speed and the current vehicle speed of the vehicle is obtained from the second MAP table to serve as the target pressure threshold, wherein the corresponding relation between the pressure threshold and the engine speed and the vehicle speed is recorded in the second MAP table;
when the current vehicle working condition is a sudden deceleration working condition, a third MAP table corresponding to the sudden deceleration working condition is obtained, and a third pressure threshold corresponding to the current engine speed and the current atmospheric pressure of the vehicle is obtained from the third MAP table to serve as the target pressure threshold, wherein the corresponding relation between the pressure threshold and the engine speed and the atmospheric pressure is recorded in the third MAP table;
and when the current vehicle working condition is a working condition except the idle working condition, the sudden acceleration working condition and the sudden deceleration working condition, taking a designated pressure threshold as the target pressure threshold.
With reference to the first aspect, in some optional embodiments, the specified pressure threshold is a minimum value of the first pressure threshold, the second pressure threshold, and the third pressure threshold.
With reference to the first aspect, in some optional embodiments, determining whether the measured value is abnormal based on the target pressure threshold value, to obtain a determination result includes:
if the measured value is smaller than the target pressure threshold value, obtaining a judging result representing that the measured value is abnormal;
and if the measured value is greater than or equal to the target pressure threshold value, obtaining a judging result representing that the measured value is normal.
With reference to the first aspect, in some optional embodiments, determining an effective pressure of the manifold according to the determination result includes:
when the judgment result shows that the measured value is abnormal, taking the model value as the effective pressure;
and when the judging result shows that the measured value is normal, taking the measured value as the effective pressure.
With reference to the first aspect, in some optional embodiments, the method further includes:
and during the period that the model value is taken as the effective pressure, if the measured value exceeds the sum of the target pressure threshold value and the preset pressure, and the absolute value of the difference value between the model value and the measured value is smaller than the preset difference value, and the duration exceeds the preset duration, resetting the manifold pressure substitution flag bit under the current vehicle working condition to take the measured value as the effective pressure.
With reference to the first aspect, in some optional embodiments, the effective pressure is used to calculate an intake air amount of the engine and an injection amount of an injection valve.
In a second aspect, the present application also provides an engine manifold pressure detection apparatus, the apparatus comprising:
the system comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring a data set related to the manifold pressure of an engine of a vehicle after the vehicle is electrified, and the data set comprises the working state of the engine, the rotating speed of the engine, state information of a pressure sensor, the current vehicle working condition, a measured value obtained by the pressure sensor for acquiring the pressure of the manifold and a model value obtained by calculating the pressure of the manifold;
the second acquisition unit is used for acquiring a target pressure threshold corresponding to the current vehicle working condition when the working state of the engine is an in-operation state, the rotating speed of the engine is greater than or equal to a minimum rotating speed threshold and the state information of the pressure sensor is a fault-free state;
the judging unit is used for judging whether the measured value is abnormal or not based on the target pressure threshold value to obtain a judging result;
and the determining unit is used for determining the effective pressure of the manifold according to the judging result, wherein when the measured value is abnormal, the measured value is replaced by the model value to serve as the effective pressure.
In a third aspect, the present application further provides an electronic device, including a processor and a memory coupled to each other, where the memory stores a computer program, which when executed by the processor, causes the electronic device to perform the above-mentioned method.
In a fourth aspect, the present application also provides a computer readable storage medium having a computer program stored therein, which when run on a computer causes the computer to perform the above-described method.
The invention adopting the technical scheme has the following advantages:
in the technical scheme provided by the application, when the working state of the engine is an in-operation state, the rotating speed of the engine is greater than or equal to a minimum rotating speed threshold value, and the state information of the pressure sensor is a fault-free state, a target pressure threshold value corresponding to the current vehicle working condition is obtained; judging whether a measured value obtained by collecting manifold pressure by a pressure sensor is abnormal or not based on a target pressure threshold value; when the measured value is abnormal, the measured value is replaced by a model value as the effective pressure. Therefore, when the pressure sensor does not have faults, but the pressure value measured by the pressure sensor is obviously different from the actual value (or theoretical value) of the manifold pressure under the current vehicle working condition, the measured value can be replaced by the model value, so that the accuracy of manifold pressure detection is improved, and the problem that the engine is flameout due to overlarge deviation between the measured value and the actual value of the manifold pressure is avoided.
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The present application may be further illustrated by the non-limiting examples given in the accompanying drawings. It is to be understood that the following drawings illustrate only certain embodiments of the present application and are therefore not to be considered limiting of its scope, for the person of ordinary skill in the art may derive other relevant drawings from the drawings without inventive effort.
FIG. 1 is a schematic waveform diagram of manifold pressure and engine speed over time according to an embodiment of the present application.
Fig. 2 is a schematic flow chart of an engine manifold pressure detection method according to an embodiment of the present application.
Fig. 3 is a block diagram of an engine manifold pressure detection device provided in an embodiment of the present application.
Icon: 200-an engine manifold pressure detection device; 210-a first acquisition unit; 220-a second acquisition unit; 230-a judging unit; 240-determination unit.
Detailed Description
The present application will be described in detail below with reference to the drawings and the specific embodiments, and it should be noted that in the drawings or the description of the specification, similar or identical parts use the same reference numerals, and implementations not shown or described in the drawings are in a form known to those of ordinary skill in the art. In the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
The inventors found that: there are cases where the signal value (or called measured value/measured value) of the manifold pressure sensor is within a reasonable signal range of the sensor in a short time, but is seriously inconsistent with the actual manifold pressure of the engine, and at this time, an alternative strategy caused by failure cannot be triggered, and further, the problem that the engine is easy to stall is caused due to too large deviation between the manifold pressure signal value and the actual value. Specifically, the above manifold pressure sensor measurement anomalies are caused by electrical control system wiring harness occasional poor contact, sensor chip occasional anomalies, sensor and ECU (Electronic Control Unit ) occasional anomalies, and the like. That is, although the measured value is within a reasonable signal range, there is still a large difference between the measured value and the actual value of the manifold pressure, which is prone to engine stall. As an example, for the case where an abnormality in manifold pressure causes the engine to stall, a waveform diagram of the engine speed, the manifold pressure, over time may be as shown in fig. 1, in which in fig. 1, during an engine speed of 0rpm, the engine is in a stall state, while the measured value of the manifold pressure is within a reasonable signal range.
In view of the above findings, the inventors propose the following examples to improve the above problems.
First embodiment
Referring to fig. 2, an embodiment of the present application provides an engine manifold pressure detection method, which may be applied to an electronic device, and the electronic device executes or implements the steps of the method. The electronic device may be an electronic control system, a vehicle-mounted computer, or the like disposed on the vehicle. A manifold pressure anomaly substitution function module may be provided in the electronic device. Wherein the functional module may be activated when the manifold pressure is abnormal and replace the measured value with the model value as the effective pressure of the manifold.
In the present embodiment, the engine manifold pressure detection method may include the steps of:
step 110, after the vehicle is electrified, acquiring a data set related to the manifold pressure of an engine of the vehicle, wherein the data set comprises the working state of the engine, the rotating speed of the engine, state information of a pressure sensor, the current vehicle working condition, a measured value obtained by the pressure sensor for collecting the pressure of the manifold and a model value obtained by calculating the pressure of the manifold;
step 120, when the working state of the engine is an in-operation state, the rotating speed of the engine is greater than or equal to a minimum rotating speed threshold, and the state information of the pressure sensor is a fault-free state, a target pressure threshold corresponding to the current vehicle working condition is obtained;
step 130, judging whether the measured value is abnormal or not based on the target pressure threshold value, and obtaining a judging result;
and 140, determining the effective pressure of the manifold according to the judging result, wherein when the measured value is abnormal, the measured value is replaced by the model value to serve as the effective pressure.
The steps of the engine manifold pressure detection method will be described in detail as follows:
in step 110, after the ignition key of the vehicle is powered on, the entire vehicle is in a powered-on state. After the vehicle is powered up, the electronics may collect a data set internal to the ECU that may include, but is not limited to, the operating state of the engine, the rotational speed of the engine, state information of the pressure sensor, current vehicle conditions, measurements taken by the pressure sensor to collect manifold pressure, and model values taken to calculate manifold pressure. The data set may also include vehicle speed, accelerator pedal position, barometric pressure of the environment in which the vehicle is located, and so forth. It should be noted that "pressure" in the embodiment of the present application may be replaced by "pressure". For example, the manifold pressure may be the pressure of the internal cavity of the manifold, or the pressure experienced by the same unit area in the manifold.
In this embodiment, the manifold may be an intake manifold in an engine. The electronic device may periodically acquire the data set, so that the manifold pressure may be periodically detected, where the duration of a single detection period of the manifold pressure may be flexibly set according to the actual situation, which is not particularly limited herein.
In this embodiment, the manner of acquiring each item of data in the data set is a conventional manner. The model value is a manifold pressure obtained by estimating the real-time working condition of the vehicle by using the existing calculation model, and the measured value is a pressure value obtained by collecting the interior of the manifold by using the pressure sensor.
Between step 110 and step 120, the electronic device may make a determination as to whether the "manifold pressure anomaly substitution function module" is on based on the acquired data set. If the operating state of the engine is "running", it indicates that the engine is running, and the engine speed is greater than or equal to the minimum speed threshold, and the state information of the pressure sensor is "None Fail", which indicates that the pressure sensor has no fault, the "manifold pressure abnormality substitution function module" is turned on, and then step 120 is performed. If any of the foregoing conditions is not satisfied, the "manifold pressure abnormality substitution function module" is turned off.
In this embodiment, the minimum rotation speed threshold and other thresholds (such as the first pressure threshold, the second pressure threshold, the third pressure threshold, the preset pressure, the preset duration, etc.) may be flexibly set according to the actual situation, and are not specifically limited herein.
When the manifold pressure abnormality replacing function module is started, the electronic equipment can select a pre-calibrated MAP table or a single value according to the current working condition of the vehicle to determine a target pressure threshold value so as to judge whether the measured value of the manifold pressure is abnormal in the current scene by utilizing the target pressure threshold value.
Specifically, in step 120, obtaining a target pressure threshold corresponding to the current vehicle condition may include:
step 121, when the current vehicle working condition is an idle working condition, acquiring a first MAP table corresponding to the idle working condition, and acquiring a first pressure threshold value corresponding to the current engine speed and the current atmospheric pressure of the vehicle from the first MAP table as the target pressure threshold value, wherein the corresponding relation between the pressure threshold value and the engine speed and the atmospheric pressure is recorded in the first MAP table;
step 122, when the current vehicle working condition is a sudden acceleration working condition, acquiring a second MAP table corresponding to the sudden acceleration working condition, and acquiring a second pressure threshold value corresponding to the current engine speed and the current vehicle speed of the vehicle from the second MAP table as the target pressure threshold value, wherein the corresponding relation between the pressure threshold value and the engine speed and the vehicle speed is recorded in the second MAP table;
step 123, when the current vehicle working condition is a sudden deceleration working condition, acquiring a third MAP table corresponding to the sudden deceleration working condition, and acquiring a third pressure threshold value corresponding to the current engine speed and the current atmospheric pressure of the vehicle from the third MAP table as the target pressure threshold value, wherein the corresponding relation between the pressure threshold value and the engine speed and the atmospheric pressure is recorded in the third MAP table;
and 124, when the current vehicle working condition is a working condition other than the idle working condition, the sudden acceleration working condition and the sudden deceleration working condition, taking a designated pressure threshold as the target pressure threshold.
In this embodiment, the first MAP table, and the first MAP table are all relationship tables calibrated in advance and are stored in the storage module of the electronic device in advance. The specified pressure threshold may be a minimum of the first pressure threshold, the second pressure threshold, and the third pressure threshold.
In step 130, based on the target pressure threshold, determining whether the measured value is abnormal, to obtain a determination result, including:
if the measured value is smaller than the target pressure threshold value, obtaining a judging result representing that the measured value is abnormal;
and if the measured value is greater than or equal to the target pressure threshold value, obtaining a judging result representing that the measured value is normal.
In step 140, determining the effective pressure of the manifold according to the determination result, including:
when the judgment result shows that the measured value is abnormal, taking the model value as the effective pressure;
and when the judging result shows that the measured value is normal, taking the measured value as the effective pressure.
It should be appreciated that in the usual case, the measured value is taken as the effective pressure of the manifold. If the pressure sensor is abnormal, or the measured value is abnormal, the measured value is replaced by the model value to take the model value as the effective pressure of the manifold. The effective pressure is the manifold pressure obtained by final detection, so that the accuracy of the manifold pressure obtained by final detection can be improved.
In this embodiment, the effective pressure may be used for internal operation by the ECU. For example, the effective pressure can be used to calculate the intake air amount of the engine and the injection amount of the injection valve, and an effective pressure with high accuracy is advantageous to improve the accuracy of the calculated intake air amount, fuel injection amount.
In this embodiment, the method may further include:
and during the period that the model value is taken as the effective pressure, if the measured value exceeds the sum of the target pressure threshold value and the preset pressure, and the absolute value of the difference value between the model value and the measured value is smaller than the preset difference value, and the duration exceeds the preset duration, resetting the manifold pressure substitution flag bit under the current vehicle working condition to take the measured value as the effective pressure.
In order to facilitate understanding of the implementation process of the method, the following will illustrate, for different vehicle working conditions, the processing flow after the "manifold pressure abnormality substitution function module" is turned on, as follows:
scene one: and under the condition that the current vehicle working condition is an idle working condition, checking the two-dimensional MAP1 (namely, the first MAP table) according to the current engine speed and the atmospheric pressure to obtain a pressure threshold A under the current idle working condition, and taking the pressure threshold A as a target pressure threshold. When the measured value of the pressure of the air inlet manifold is smaller than the threshold value A, the position of the air inlet manifold pressure substitution marker is set under the idle working condition, and at the moment, the measured value is replaced by the model value of the pressure of the air inlet manifold. During the application of the substitution value, if the measured value of the intake manifold pressure exceeds a threshold value a+e (i.e. the sum of the pressure threshold value a and the preset pressure E, the preset pressure E may be flexibly determined according to the actual situation), and the absolute value of the difference between the measured value of the intake manifold pressure and the model value of the intake manifold pressure is smaller than a threshold value DP (i.e. the preset difference), and the duration exceeds a preset duration T, the manifold pressure substitution flag bit is reset under the idle working condition, the measured value of the intake manifold pressure is restored to be valid, and the model value of the intake manifold pressure exits from the substitution.
Wherein, the pressure threshold A can be flexibly determined. For example, the minimum intake manifold pressure values that may occur for a complete vehicle in different idle scenarios should be considered, but ensuring that the vehicle does not stall. The pressure threshold A can be determined by performing a whole vehicle calibration test at different idle speeds and different atmospheric pressures.
Scene II: and under the condition that the current vehicle working condition is a sudden acceleration working condition, searching the two-dimensional MAP2 (namely, the second MAP table) according to the current engine speed and the vehicle speed, obtaining a pressure threshold value B under the current idle working condition, and taking the pressure threshold value B as a target pressure threshold value. When the measured value of the pressure of the air inlet manifold is smaller than the threshold value B, the position of the air inlet manifold pressure substitution marker is set under the idle working condition, and at the moment, the measured value is replaced by the model value of the pressure of the air inlet manifold. During this surrogate value application, if the intake manifold pressure measurement exceeds the threshold value b+e, and the absolute value of the difference between the intake manifold pressure measurement and the intake manifold pressure model value is less than the threshold value DP, and the duration exceeds the preset time period T, the manifold pressure surrogate flag is reset under the rapid acceleration condition, the intake manifold pressure measurement is restored to be valid, and the model value of the intake manifold pressure is exited from the surrogate.
Wherein, the pressure threshold B can be flexibly determined. For example, regarding the pressure threshold B, the minimum intake manifold pressure value that may occur in different rapid acceleration scenarios of the whole vehicle should be considered, for example, manifold pressure variation caused by the influence of the inflation efficiency deviation caused by VVT (Variable Valve Timing ) actuation on combustion during rapid acceleration should be considered, so that both the vehicle is ensured not to stall and rapid acceleration is ensured to be smooth.
Scene III: and under the condition that the current vehicle working condition is a sudden deceleration working condition, checking the two-dimensional MAP3 according to the current engine speed and the atmospheric pressure (namely, the third MAP table) to obtain a pressure threshold C under the current idle working condition, and taking the pressure threshold C as a target pressure threshold. When the measured value of the pressure of the air inlet manifold is smaller than the threshold value C, the position of the air inlet manifold pressure substitution marker is set under the idle working condition, and at the moment, the measured value is replaced by the model value of the pressure of the air inlet manifold. During the application of the substitution value, if the measured value of the intake manifold pressure exceeds a threshold value C+E, and the absolute value of the difference between the measured value of the intake manifold pressure and the model value of the intake manifold pressure is smaller than a threshold value DP and the duration exceeds a preset duration T, the substitution flag bit of the manifold pressure is reset under the sudden deceleration working condition, the measured value of the intake manifold pressure is restored to be effective, and the model value of the intake manifold pressure is withdrawn from substitution.
Wherein the pressure threshold C can be flexibly determined. For example, regarding the pressure threshold C, it should be considered that the pressure of the intake manifold drops rapidly due to the rapid return of the VVT to the initial position during the rapid acceleration fuel-cut and overcharge of the whole vehicle, and smooth deceleration process should be ensured, and no erroneous substitution can occur.
Scene four: when the current vehicle working condition is the working condition except the idle speed, the sudden acceleration and the sudden deceleration working condition and the measured value of the pressure of the air inlet manifold is smaller than the threshold value D (namely the target pressure threshold value is a single value), the pressure of the air inlet manifold is replaced by the marker position set under the idle speed working condition, and the measured value is replaced by the model value of the pressure of the air inlet manifold. During this surrogate value application, if the intake manifold pressure measurement exceeds d+e, and the absolute value of the difference between the intake manifold pressure measurement and the intake manifold pressure model value is less than the threshold DP, and the duration exceeds the preset duration T, the manifold pressure surrogate flag is reset under normal conditions, the actual intake manifold pressure value is restored, and the model value of intake manifold pressure is exited from the surrogate.
Wherein, the pressure threshold B can be flexibly determined. For example, the threshold value D is determined mainly by considering that the measured pressure of the intake manifold may drop during normal driving such as non-idle, sudden-increase, and sudden-decrease, and the D value may be the minimum value in a/B/C.
Based on the above design, the present application may replace the measured value with the model value to improve the accuracy of the detected manifold pressure, for the problem that the measured value of the manifold pressure is within a reasonable signal range, but still has a large difference from the actual value of the manifold pressure. The accurate manifold pressure can improve the calculation accuracy and the control accuracy of the air inflow and the fuel injection quantity of the engine, and can solve the problem of flameout of the engine caused by abnormal manifold pressure.
Second embodiment
Referring to fig. 3, the present application further provides an engine manifold pressure detecting apparatus 200, where the engine manifold pressure detecting apparatus 200 includes at least one software functional module that may be stored in a memory module in the form of software or Firmware (Firmware) or cured in an Operating System (OS) of an electronic device. The processing module is configured to execute executable modules stored in the storage module, such as software functional modules and computer programs included in the engine manifold pressure detection apparatus 200.
The functions of each unit in the engine manifold pressure detection device 200 may be as follows:
a first obtaining unit 210, configured to obtain, after a vehicle is powered on, a data set related to a manifold pressure of an engine of the vehicle, where the data set includes an operating state of the engine, a rotational speed of the engine, state information of a pressure sensor, a current vehicle working condition, a measured value obtained by the pressure sensor collecting the pressure of the manifold, and a model value obtained by calculating the pressure of the manifold;
a second obtaining unit 220, configured to obtain a target pressure threshold corresponding to the current vehicle working condition when the working state of the engine is an in-operation state, the rotational speed of the engine is greater than or equal to a minimum rotational speed threshold, and the state information of the pressure sensor is a fault-free state;
a judging unit 230, configured to judge whether the measured value is abnormal based on the target pressure threshold value, so as to obtain a judgment result;
and a determining unit 240 configured to determine an effective pressure of the manifold according to the determination result, wherein when the measured value is abnormal, the measured value is replaced with the model value as the effective pressure.
Alternatively, the second acquisition unit 220 may be configured to:
when the current vehicle working condition is an idle working condition, a first MAP table corresponding to the idle working condition is obtained, and a first pressure threshold corresponding to the current engine speed and the current atmospheric pressure of the vehicle is obtained from the first MAP table to serve as the target pressure threshold, wherein the corresponding relation between the pressure threshold and the engine speed and the atmospheric pressure is recorded in the first MAP table;
when the current vehicle working condition is a sudden acceleration working condition, a second MAP table corresponding to the sudden acceleration working condition is obtained, and a second pressure threshold corresponding to the current engine speed and the current vehicle speed of the vehicle is obtained from the second MAP table to serve as the target pressure threshold, wherein the corresponding relation between the pressure threshold and the engine speed and the vehicle speed is recorded in the second MAP table;
when the current vehicle working condition is a sudden deceleration working condition, a third MAP table corresponding to the sudden deceleration working condition is obtained, and a third pressure threshold corresponding to the current engine speed and the current atmospheric pressure of the vehicle is obtained from the third MAP table to serve as the target pressure threshold, wherein the corresponding relation between the pressure threshold and the engine speed and the atmospheric pressure is recorded in the third MAP table;
and when the current vehicle working condition is a working condition except the idle working condition, the sudden acceleration working condition and the sudden deceleration working condition, taking a designated pressure threshold as the target pressure threshold.
Alternatively, the judging unit 230 may be configured to:
if the measured value is smaller than the target pressure threshold value, obtaining a judging result representing that the measured value is abnormal;
and if the measured value is greater than or equal to the target pressure threshold value, obtaining a judging result representing that the measured value is normal.
Alternatively, the determining unit 240 may be configured to:
when the judgment result shows that the measured value is abnormal, taking the model value as the effective pressure;
and when the judging result shows that the measured value is normal, taking the measured value as the effective pressure.
Optionally, the engine manifold pressure detecting apparatus 200 may further include a substitute exiting unit, configured to reset a manifold pressure substitute flag bit under the current vehicle working condition to use the measured value as the effective pressure if the measured value exceeds the sum of the target pressure threshold and a preset pressure and an absolute value of a difference between the model value and the measured value is smaller than a preset difference and a duration exceeds a preset duration during the period when the model value is used as the effective pressure.
It should be noted that, for convenience and brevity of description, the specific working process of the engine manifold pressure detecting device 200 described above may refer to the corresponding process of each step in the foregoing method, and will not be repeated here.
Third embodiment
The embodiment of the application provides electronic equipment, which can comprise a processing module and a storage module. The memory module stores a computer program that, when executed by the processing module, enables the electronic device to perform the respective steps in the engine manifold pressure detection method described below.
In particular, the electronic device may be, but is not limited to, a personal computer, a server, an electronic control system deployed on a vehicle.
In this embodiment, the processing module may be an integrated circuit chip with signal processing capability. The processing module may be a general purpose processor. For example, the processor may be a central processing unit (Central Processing Unit, CPU), digital signal processor (Digital Signal Processing, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present application.
The memory module may be, but is not limited to, random access memory, read only memory, programmable read only memory, erasable programmable read only memory, electrically erasable programmable read only memory, and the like. In this embodiment, the storage module may be configured to store an operating state of the engine, a rotational speed of the engine, state information of a pressure sensor, a current vehicle condition, a measured value of the pressure of the manifold collected by the pressure sensor, a model value of the pressure of the manifold calculated, an effective pressure of the manifold, and the like. Of course, the storage module may also be used to store a program, and the processing module executes the program after receiving the execution instruction.
It should be noted that, for convenience and brevity of description, specific working processes of the electronic device described above may refer to corresponding processes of each step in the foregoing method, and will not be described in detail herein.
Fourth embodiment
Embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium has stored therein a computer program which, when run on a computer, causes the computer to execute the engine manifold pressure detection method as described in the above embodiments.
From the foregoing description of the embodiments, it will be apparent to those skilled in the art that the present application may be implemented in hardware, or by means of software plus a necessary general hardware platform, and based on this understanding, the technical solution of the present application may be embodied in the form of a software product, where the software product may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disc, a mobile hard disk, etc.), and includes several instructions to cause a computer device (may be a personal computer, an electronic device, or a network device, etc.) to perform the methods described in the respective implementation scenarios of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus, system, and method may be implemented in other manners as well. The above-described apparatus, systems, and method embodiments are merely illustrative, for example, flow charts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. In addition, the functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. An engine manifold pressure detection method, the method comprising:
after a vehicle is electrified, acquiring a data set related to manifold pressure of an engine of the vehicle, wherein the data set comprises a working state of the engine, a rotating speed of the engine, state information of a pressure sensor, current vehicle working conditions, a measured value obtained by the pressure sensor for collecting the pressure of the manifold and a model value obtained by calculating the pressure of the manifold;
when the working state of the engine is an in-operation state, the rotating speed of the engine is greater than or equal to a minimum rotating speed threshold value, and the state information of the pressure sensor is a fault-free state, a target pressure threshold value corresponding to the current vehicle working condition is obtained;
judging whether the measured value is abnormal or not based on the target pressure threshold value to obtain a judging result;
and determining the effective pressure of the manifold according to the judging result, wherein when the measured value is abnormal, the measured value is replaced by the model value to serve as the effective pressure.
2. The method of claim 1, wherein obtaining a target pressure threshold corresponding to a current vehicle condition comprises:
when the current vehicle working condition is an idle working condition, a first MAP table corresponding to the idle working condition is obtained, and a first pressure threshold corresponding to the current engine speed and the current atmospheric pressure of the vehicle is obtained from the first MAP table to serve as the target pressure threshold, wherein the corresponding relation between the pressure threshold and the engine speed and the atmospheric pressure is recorded in the first MAP table;
when the current vehicle working condition is a sudden acceleration working condition, a second MAP table corresponding to the sudden acceleration working condition is obtained, and a second pressure threshold corresponding to the current engine speed and the current vehicle speed of the vehicle is obtained from the second MAP table to serve as the target pressure threshold, wherein the corresponding relation between the pressure threshold and the engine speed and the vehicle speed is recorded in the second MAP table;
when the current vehicle working condition is a sudden deceleration working condition, a third MAP table corresponding to the sudden deceleration working condition is obtained, and a third pressure threshold corresponding to the current engine speed and the current atmospheric pressure of the vehicle is obtained from the third MAP table to serve as the target pressure threshold, wherein the corresponding relation between the pressure threshold and the engine speed and the atmospheric pressure is recorded in the third MAP table;
and when the current vehicle working condition is a working condition except the idle working condition, the sudden acceleration working condition and the sudden deceleration working condition, taking a designated pressure threshold as the target pressure threshold.
3. The method of claim 2, wherein the specified pressure threshold is a minimum of the first pressure threshold, the second pressure threshold, and the third pressure threshold.
4. The method of claim 1, wherein determining whether the measured value is abnormal based on the target pressure threshold value, results in a determination result, comprises:
if the measured value is smaller than the target pressure threshold value, obtaining a judging result representing that the measured value is abnormal;
and if the measured value is greater than or equal to the target pressure threshold value, obtaining a judging result representing that the measured value is normal.
5. The method of claim 1, wherein determining the effective pressure of the manifold based on the determination comprises:
when the judgment result shows that the measured value is abnormal, taking the model value as the effective pressure;
and when the judging result shows that the measured value is normal, taking the measured value as the effective pressure.
6. The method of claim 5, wherein the method further comprises:
and during the period that the model value is taken as the effective pressure, if the measured value exceeds the sum of the target pressure threshold value and the preset pressure, and the absolute value of the difference value between the model value and the measured value is smaller than the preset difference value, and the duration exceeds the preset duration, resetting the manifold pressure substitution flag bit under the current vehicle working condition to take the measured value as the effective pressure.
7. The method according to any one of claims 1 to 6, characterized in that the effective pressure is used to calculate an intake air amount of the engine and an injection amount of an injection valve.
8. An engine manifold pressure detection apparatus, the apparatus comprising:
the system comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring a data set related to the manifold pressure of an engine of a vehicle after the vehicle is electrified, and the data set comprises the working state of the engine, the rotating speed of the engine, state information of a pressure sensor, the current vehicle working condition, a measured value obtained by the pressure sensor for acquiring the pressure of the manifold and a model value obtained by calculating the pressure of the manifold;
the second acquisition unit is used for acquiring a target pressure threshold corresponding to the current vehicle working condition when the working state of the engine is an in-operation state, the rotating speed of the engine is greater than or equal to a minimum rotating speed threshold and the state information of the pressure sensor is a fault-free state;
the judging unit is used for judging whether the measured value is abnormal or not based on the target pressure threshold value to obtain a judging result;
and the determining unit is used for determining the effective pressure of the manifold according to the judging result, wherein when the measured value is abnormal, the measured value is replaced by the model value to serve as the effective pressure.
9. An electronic device comprising a processor and a memory coupled to each other, the memory storing a computer program that, when executed by the processor, causes the electronic device to perform the method of any of claims 1-7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when run on a computer, causes the computer to perform the method according to any of claims 1-7.
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| CN202410007326.0A CN117782420A (en) | 2024-01-02 | 2024-01-02 | Engine manifold pressure detection method, device, electronic equipment and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410007326.0A CN117782420A (en) | 2024-01-02 | 2024-01-02 | Engine manifold pressure detection method, device, electronic equipment and storage medium |
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