CN115653774B - Safety monitoring method and system for engine air inflow function and vehicle with safety monitoring system - Google Patents
Safety monitoring method and system for engine air inflow function and vehicle with safety monitoring systemInfo
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- CN115653774B CN115653774B CN202211399203.3A CN202211399203A CN115653774B CN 115653774 B CN115653774 B CN 115653774B CN 202211399203 A CN202211399203 A CN 202211399203A CN 115653774 B CN115653774 B CN 115653774B
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Abstract
The invention discloses a redundancy principle-based engine air inflow functional safety monitoring method, system and vehicle thereof, which specifically comprise the steps of collecting air inflow, supercharging pressure and air inflow pressure after a throttle valve, setting a main charging model and a secondary charging model, calculating, and outputting the main charging air inflow and the secondary charging air inflow; and comparing the main charge air inflow with the secondary charge air inflow, and outputting a corresponding safety monitoring strategy by decision. Based on the redundancy principle of functional safety, the invention uses three different sensors to calculate the air inflow through two independent methods, firstly collects the parameters of the air flow sensor to calculate the air inflow, then collects the parameters of the throttle position sensor, the supercharging pressure sensor and the air intake pressure sensor behind the throttle to calculate the air inflow, and achieves the purpose of functional safety monitoring of the air inflow of the engine by comparing the two redundant air inflow values.
Description
Technical Field
The invention relates to a safety monitoring method, a safety monitoring system and a vehicle thereof, in particular to a safety monitoring method, a safety monitoring system and a vehicle thereof for the function of the air inflow of an engine.
Background
In the requirement of functional safety, the monitoring layer is independent of the functional layer to realize the monitoring function of the functional layer, but in practical engineering projects, due to design and cost reasons, the functional layer and the monitoring layer are used with input signals of one sensor in most cases, if the input signals are problematic, the whole monitoring system can generate common cause failure, so that all the input signals used by the monitoring layer are monitored or limited, the reliability of functional safety monitoring is improved, and the fault response of safety monitoring is immediately carried out once the input signals are found out. While the intake air amount is an input amount directly related to the power output, the importance of which is conceivable.
The existing engine air inflow function safety monitoring strategy is that the air inflow minimum value is estimated through the opening degree input and the rotating speed input of a throttle valve, meanwhile, the factors of a supercharger are also considered, so that an experienced calibration engineer is required to determine under different working conditions, the workload is huge, and the strategy is required to be formulated for monitoring and optimizing at different stages of engine operation, so that the complexity of a function safety program is increased. The final objective of these works is to estimate a minimum intake air amount as realistic as possible, to monitor the intake air amount measured by the intake air flow sensor, and to monitor only the case where the intake air amount is too small, so that it is an inaccurate monitoring strategy.
In summary, in the conventional intake air amount functional safety monitoring method, because of limitation of the intake air amount related sensor (redundancy cannot be formed), a minimum intake air amount value needs to be estimated or calibrated under different working conditions to monitor the fault that the intake air amount related sensor is too small in acquisition value, so that the failure of functional safety torque monitoring caused by too small actual torque calculation value due to too small intake air amount is avoided.
Disclosure of Invention
The invention aims to provide a functional safety monitoring method and system for engine air inflow and a vehicle thereof, and aims to solve the technical problems that based on a redundancy principle of power safety, a plurality of sensors generally collect sensing signals and then calculate the sensing signals through an independent calculation method, so that the purpose of functional safety monitoring for the engine air inflow is achieved on the basis of ensuring redundancy.
The invention solves the other technical problem that the condition of failure (simultaneous open circuit or short circuit) of the three sensors is verified according to the monitoring model, thereby fully meeting the redundant condition of functional safety monitoring, improving the monitoring precision of the air inflow under each environment, simultaneously monitoring the conditions of too small and too large air inflow and improving the reliability of the air inflow value.
The invention provides the following scheme:
A functional safety monitoring method of engine air inflow based on redundancy principle specifically comprises the following steps:
collecting air inflow, supercharging pressure and air inflow pressure behind a throttle valve, setting a main charging model, calculating and outputting main charging air inflow;
receiving a throttle opening parameter, a boost pressure parameter and a post-throttle intake pressure parameter, setting a secondary charging model, calculating, and outputting a secondary charging air quantity;
and comparing the main charge air inflow with the secondary charge air inflow, and outputting a corresponding safety monitoring strategy by decision.
Further, an air flow meter, a boost pressure sensor and a throttle rear intake pressure sensor are utilized to respectively collect air inflow, boost pressure and throttle rear intake pressure sensing signals.
Further, the output signal of the air flowmeter is a send signal, and the main charging model sets a calibration quantity and a strategy according to the signal value to calculate the value of the air inflow;
the output signals of the boost pressure sensor and the throttle rear intake pressure sensor are analog signals, and the secondary charging model calculates boost pressure and throttle rear intake pressure according to the analog signal value set standard quantity and strategy.
Further, the mass air flow actually flowing through the throttle valve is calculated based on the throttle opening and the throttle front-to-rear air flow ratio.
Further, when the valve opening is more than 95%, the throttle opening information needs to be introduced when the threshold is set, and different thresholds are calibrated according to different throttle openings to limit.
Further, the safety monitoring strategy corresponding to the decision output specifically comprises the steps of detecting out-of-limit rotating speed in fault response monitoring, stopping a limp mode, closing a power device, triggering a main control system to reset, and enabling an engine to enter a safety mode.
An engine air inflow functional safety monitoring system based on a redundancy principle specifically comprises:
the main charging air inflow output module is used for collecting air inflow, supercharging pressure and air inflow pressure after a throttle valve, setting a main charging model, calculating and outputting main charging air inflow;
The secondary charging air inflow output module is used for receiving the throttle opening parameter, the supercharging pressure parameter and the post-throttle intake pressure parameter, setting a secondary charging model, calculating and outputting the secondary charging air inflow;
And the safety monitoring strategy decision output module compares the main charging air inflow with the secondary charging air inflow and outputs a corresponding safety monitoring strategy.
The electronic device is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are in communication with each other through the communication bus, and the memory stores a computer program which when executed by the processor causes the processor to execute the steps of the method.
A computer readable storage medium storing a computer program executable by an electronic device, which when run on the electronic device causes the electronic device to perform the steps of the method.
A vehicle, characterized by comprising:
The electronic equipment is used for realizing a safety monitoring method of the engine air inflow function based on a redundancy principle;
a processor that runs a program, and when the program is run, performs the step of the redundancy principle-based engine intake air amount function safety monitoring method on data output from the electronic device;
a storage medium storing a program that, when executed, performs the steps of the redundancy principle-based engine intake air amount function safety monitoring method on data output from an electronic device.
Compared with the prior art, the invention has the following advantages:
Based on the redundancy principle of functional safety, the invention calculates the air inflow by using three different sensors through two independent methods, firstly collects the parameters of the air flow sensor to calculate the air inflow, then collects the parameters of the throttle position sensor (the reliability of which is determined by the related functional safety monitoring and is not calculated in a redundancy system), the supercharging pressure sensor and the air inflow sensor behind the throttle to calculate the air inflow, and the purpose of functional safety monitoring on the engine air inflow is achieved by comparing the two redundant air inflow values.
The invention fully utilizes the redundant relation formed by the sufficient air inflow related sensors, so that the data used by two methods for independently calculating the air inflow are acquired by three different sensors, the sensors used by the two methods have no interactive relation, the condition of failure (simultaneous open circuit or short circuit) of the three sensors is verified according to a monitoring model (the two conditions of simultaneous failure of the three sensors and two-by-two distortion but not monitored belong to extremely small probability events in the functional safety concept, and the two conditions can not be verified), and the redundant condition of functional safety monitoring is fully satisfied. The invention improves the monitoring precision of the important input of the air inflow under various environments, can monitor the conditions of too small and too large air inflow at the same time, and truly improves the reliability of the air inflow value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an engine intake air amount function safety monitoring method based on the redundancy principle according to an embodiment of the present invention.
Fig. 2 is a diagram of the architecture of an engine intake air amount functional safety monitoring system based on the redundancy principle according to an embodiment of the present invention.
Fig. 3 is a functional block diagram of intake air amount monitoring of the electronic control system of the gasoline engine.
Fig. 4 is a functional schematic diagram of the sub-charge air amount calculation model.
Fig. 5 is a functional schematic diagram of the comparison of the stoichiometric fuel injection quantity with the relative intake air quantity.
Fig. 6 is a schematic structural diagram of an electronic device.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The flow of the safety monitoring of the engine air inflow function based on the redundancy principle shown in fig. 1 specifically comprises the following steps:
s1, collecting air inflow, supercharging pressure and air inflow pressure behind a throttle valve, setting a main charging model, calculating and outputting main charging air inflow;
Specifically, an air flow meter, a boost pressure sensor and a throttle rear intake pressure sensor are utilized to respectively collect air inflow, boost pressure and throttle rear intake pressure sensing signals;
specifically, the output signal of the air flowmeter is a send signal, and the main charging model sets a calibration quantity and a strategy according to the signal value to calculate the value of the air inflow;
Output signals of the boost pressure sensor and the throttle rear intake pressure sensor are analog signals, and the secondary charging model calculates boost pressure and throttle rear intake pressure according to the analog signal value setting standard quantity and strategy;
Specifically, the mass air flow actually flowing through the throttle valve is calculated based on the throttle opening and the throttle front-to-rear air flow ratio.
S2, receiving a throttle opening parameter, a boost pressure parameter and a post-throttle intake pressure parameter, setting a secondary charging model, calculating, and outputting a secondary charging air quantity;
specifically, when the valve opening is more than 95%, the throttle opening information is required to be introduced when the threshold is set, and different thresholds are calibrated according to different throttle openings to limit;
s3, comparing the main charge air inflow with the secondary charge air inflow, and deciding to output a corresponding safety monitoring strategy;
Specifically, the decision-making outputs a corresponding safety monitoring strategy, and specifically comprises the steps of detecting out-of-limit rotating speed in fault response monitoring, stopping a limp mode, closing a power device, triggering a main control system to reset, and enabling an engine to enter a safety mode.
For the purposes of simplicity of explanation, the method steps disclosed in the above embodiments are depicted as a series of acts in a combination, but it should be understood by those skilled in the art that the embodiments of the present invention are not limited by the order of acts described, as some steps may occur in other order or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required by the embodiments of the invention.
The engine air inflow functional safety monitoring system based on the redundancy principle according to the embodiment of the invention shown in fig. 2 specifically comprises:
the main charging air inflow output module is used for collecting air inflow, supercharging pressure and air inflow pressure after a throttle valve, setting a main charging model, calculating and outputting main charging air inflow;
The secondary charging air inflow output module is used for receiving the throttle opening parameter, the supercharging pressure parameter and the post-throttle intake pressure parameter, setting a secondary charging model, calculating and outputting the secondary charging air inflow;
And the safety monitoring strategy decision output module compares the main charging air inflow with the secondary charging air inflow and outputs a corresponding safety monitoring strategy.
It should be noted that, although only some basic functional modules are disclosed in the present embodiment, the composition of the present system is not limited to the above basic functional modules, but rather, the present embodiment is to be construed as meaning that one skilled in the art can add one or more functional modules to any combination of the above basic functional modules to form an infinite number of embodiments or technical solutions, that is, the present system is open and not closed, and the scope of protection of the claims of the present invention should not be limited to the disclosed basic functional modules because the present embodiment only discloses individual basic functional modules. Meanwhile, for convenience of description, the above devices are described as being functionally divided into various units and modules, respectively. Of course, the functions of the units, modules may be implemented in one or more pieces of software and/or hardware when implementing the invention.
The embodiments of the system described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The embodiment of the invention comprises three functional parts, wherein the first part is the function of calculating corresponding input values (air inflow, boost pressure and air intake pressure after a throttle valve) by using parameters acquired by three sensors, the second part is the function of calculating another redundant air intake value by using the input values such as the opening degree of the throttle valve, the boost pressure and the air intake pressure after the throttle valve, and the third part is the function of comparing the air intake values. The model for acquiring and calculating the air inflow through the air flowmeter is called a main charging model, the model for acquiring and calculating the air inflow through the supercharging pressure sensor and the air inlet pressure sensor behind the throttle valve is called a secondary charging model, and finally the two paths of calculated air inflow values are compared and monitored.
1, A correlation input amount calculation model:
The module calculates relevant input quantity according to parameters of different types of sensors collected by the electric control system, and output signals of the sensors can be classified into send signals, analog signals and frequency signals. The main air charging amount is calculated through the acquisition parameters of the air flowmeter, the output signal of the air flowmeter is a send signal, and the model calculates the value of the air charging amount according to the signal value set calibration amount and strategy. The output signals of the boost pressure sensor and the air intake pressure sensor behind the throttle valve are analog signals, and the same model is used for calculating the boost pressure and the air intake pressure behind the throttle valve according to the set standard quantity and strategy of the analog signal values. The function of this module is to correctly calculate the relevant inputs (boost pressure and post-throttle intake pressure) required for the main charge air amount and the sub charge air amount calculation.
2, A secondary charging air inflow calculation model:
The main function of the module is to calculate the air mass flow actually flowing through the throttle valve according to the opening degree of the throttle valve and the front-back air flow ratio of the throttle valve, and the module plays an important role in monitoring the air inflow together with the calculation result of the main charging model.
The secondary charging air inflow calculation model comprises two functional sub-modules, namely a throttle front-back air flow pressure ratio and a Santa-View influence factor sub-module, and an air mass flow sub-module for calculating the air mass flow flowing through the throttle according to throttle opening information and the Santa-View influence factor plus an offset. The method and the device have the advantages that the air mass flow calculation model actually flowing through the throttle valve is reasonably simplified, although the calculation accuracy is slightly affected, the monitoring requirement can be completely met, meanwhile, the model tends to be concise to comply with the requirement on the model construction complexity in the functional safety standard, the modules with smaller influence on the calculation result and complex construction are removed, and meanwhile, a reasonable threshold value is set to meet the monitoring requirement.
Referring to fig. 4, the calculation principle of the sub-charge air intake amount calculation model is as follows, receiving a throttle opening parameter, a boost pressure parameter and a post-throttle intake pressure parameter, performing pressure correction factor calculation on the boost pressure parameter to output a pressure correction factor, performing temperature correction factor calculation on an intake air temperature to output a temperature correction factor, outputting a pressure ratio and a san-valan influence factor according to the boost pressure parameter, the post-throttle intake pressure parameter, the pressure correction factor and the temperature correction factor, calculating an air mass flow through the throttle according to a nominal air mass flow offset calibration setting, the pressure ratio and the san-valan influence factor and the throttle opening parameter of the throttle, and further outputting a sub-charge air intake amount.
As shown in fig. 4, the description of the model simplified section will be given below:
(1) The invention simplifies the air mass flow sub-module for calculating the air mass flow flowing through the throttle valve according to the throttle opening information, and does not introduce the complex strategy for calculating the air inflow under the working condition that the throttle opening is more than 95%, so that when the throttle opening is more than 95%, the air inflow value calculated by the model has errors, the throttle opening information is required to be introduced when the threshold value is set, different thresholds are calibrated according to different throttle openings to limit, the requirement of safety monitoring of the air inflow is met, and false alarm is avoided.
(2) The method simplifies the calculation of the deviation of the nominal air mass flow through the throttle valve, which is generated by the phenomena of fast and slow conversion of air flow, air leakage and the like, and the variable always changes around a calibration amount in the actual working process of the vehicle, the change range is small, and the values of the variable are almost consistent in most of time, so the method directly replaces the complex calculation process of the deviation by the calibration amount.
(3) The method modifies the calculation of the air mass flow density correction factor flowing through the throttle valve, the correction factor is used for calculating the san-Vietnam influence factor, and is calculated by temperature correction, pressure correction and functional layer primary and secondary charging verification correction.
As shown in fig. 5, the comparison function of the primary and secondary charge air amount:
The comparison primary and secondary charge models calculate the intake air amount, which only needs to be compared when no other throttle valve power failure response occurs. Since the safety monitoring exits the torque monitoring mode to enter the rotation speed monitoring mode at this time, the monitoring of the intake air amount is no longer required.
The necessary condition for comparing the air inflow of the monitoring layer is to set a proper threshold calibration, calibrate a proper two-dimensional data table according to the throttle opening information and the engine speed, and properly release the threshold when the speed is lower, the speed is higher and the throttle opening is more than 95%, so that the monitoring requirement is met and false alarm faults are avoided. When the deviation of the intake air quantity value calculated by the primary charge and the secondary charge exceeds the maximum allowable value, the intake air quantity related sensor has a problem, and the actual torque calculated by the monitoring layer is smaller due to smaller measurement data of the intake air quantity sensor, which is a potential dangerous situation. When the air inflow monitoring detects errors, the fault time is accumulated, and when the fault time exceeds a maximum allowable value, fault response is triggered, namely, an air inflow monitoring fault flag bit is set, a throttle valve cut-off flag bit is set, a throttle valve enabling is cut off, a limp-home mode is entered, and fault response monitoring is entered. The invention also carries out the verification of failure of the sensors related to the monitoring of the three air inflow, selects two of the three sensors to be respectively combined, carries out the fault model of short circuit and circuit breaking, verifies whether the air inflow monitoring function is active at the moment, and reports the safety monitoring fault.
If the rotating speed is detected to be out of limit in the fault response monitoring, the limp mode fault is indicated, and the limp mode can not continue to operate any more for ensuring safety. The safety monitoring function will shut down the power device, trigger the main control system to reset, and after reset, no attempt is made to re-control the engine but to enter a safe mode.
As shown in fig. 6, the embodiment of the invention also discloses an electronic device and a storage medium corresponding to the method and the system for monitoring the engine air inflow function safety based on the redundancy principle:
The electronic equipment comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus, the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the engine air inflow function safety monitoring method based on the redundancy principle.
A computer-readable storage medium storing a computer program executable by an electronic device, which when run on the electronic device, causes the electronic device to perform the steps of an engine intake air amount function safety monitoring method based on a redundancy principle.
A vehicle specifically includes:
The electronic equipment is used for realizing a safety monitoring method of the engine air inflow function based on a redundancy principle;
A processor that runs a program, and when the program is run, performs a step of an engine intake air amount function safety monitoring method based on a redundancy principle on data output from the electronic device;
a storage medium storing a program that, when executed, performs the steps of the engine intake air amount function safety monitoring method based on the redundancy principle on data output from an electronic device.
The Processor may be a general-purpose Processor including a central processing unit (Central Processing Unit, CPU), a network Processor (Network Processor, NP), etc., or may be a digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components.
The communication bus mentioned above for the electronic device may be a peripheral component interconnect standard (PERIPHERAL COMPONENT INTERCONNECT, PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, etc. The communication bus may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, the figures are shown with only one bold line, but not with only one bus or one type of bus.
The electronic device includes a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on top of the operating system. The hardware layer includes hardware such as a central processing unit (CPU, central Processing Unit), a memory management unit (MMU, memory Management Unit), and a memory. The operating system may be any one or more computer operating systems that implement electronic device control via processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system, etc. In addition, in the embodiment of the present invention, the electronic device may be a handheld device such as a smart phone, a tablet computer, or an electronic device such as a desktop computer, a portable computer, which is not particularly limited in the embodiment of the present invention.
The execution body controlled by the electronic device in the embodiment of the invention can be the electronic device or a functional module in the electronic device, which can call a program and execute the program. The electronic device may obtain firmware corresponding to the storage medium, where the firmware corresponding to the storage medium is provided by the vendor, and the firmware corresponding to different storage media may be the same or different, which is not limited herein. After the electronic device obtains the firmware corresponding to the storage medium, the firmware corresponding to the storage medium can be written into the storage medium, specifically, the firmware corresponding to the storage medium is burned into the storage medium. The process of burning the firmware into the storage medium may be implemented by using the prior art, and will not be described in detail in the embodiment of the present invention.
The electronic device may further obtain a reset command corresponding to the storage medium, where the reset command corresponding to the storage medium is provided by the provider, and the reset commands corresponding to different storage media may be the same or different, which is not limited herein.
At this time, the storage medium of the electronic device is a storage medium in which the corresponding firmware is written, and the electronic device may respond to a reset command corresponding to the storage medium in which the corresponding firmware is written, so that the electronic device resets the storage medium in which the corresponding firmware is written according to the reset command corresponding to the storage medium. The process of resetting the storage medium according to the reset command may be implemented in the prior art, and will not be described in detail in the embodiments of the present invention.
The embodiment of the invention also discloses a safety monitoring method for the engine air inflow function based on the redundancy principle system, electronic device and storage medium corresponding vehicle:
a vehicle specifically includes:
The electronic equipment is used for realizing a safety monitoring method of the engine air inflow function based on a redundancy principle;
A processor that runs a program, and when the program is run, performs a step of an engine intake air amount function safety monitoring method based on a redundancy principle on data output from the electronic device;
a storage medium storing a program that, when executed, performs the steps of the engine intake air amount function safety monitoring method based on the redundancy principle on data output from an electronic device.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that certain terms are used throughout the description and claims to refer to particular elements. It will be appreciated by those of ordinary skill in the art that different manufacturers, manufacturers may refer to a component by different names. The description and claims do not differ by the way in which they distinguish between components, but rather differ by the way in which they function.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
In addition, functional modules in the embodiments of the present invention 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.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including the corresponding claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including the corresponding claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It should be noted that the above embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.
Claims (8)
1. A functional safety monitoring method of engine air inflow based on redundancy principle is characterized by comprising the following steps:
collecting air inflow, supercharging pressure and air inflow pressure behind a throttle valve, setting a main charging model, calculating and outputting main charging air inflow;
receiving a throttle opening parameter, a boost pressure parameter and a post-throttle intake pressure parameter, setting a secondary charging model, calculating, and outputting a secondary charging air quantity;
Comparing the main charge air inflow with the secondary charge air inflow, and outputting a corresponding safety monitoring strategy by decision;
The method for calculating the throttle opening parameter, the boost pressure parameter and the post-throttle intake pressure parameter comprises the steps of:
Receiving the throttle opening parameter, the boost pressure parameter and the post-throttle intake pressure parameter;
performing a pressure correction factor calculation on the boost pressure parameter to output a pressure correction factor;
Performing temperature correction factor calculation on the intake air temperature to output a temperature correction factor;
Outputting a pressure ratio and a san velam influence factor according to the boost pressure parameter, the post-throttle intake pressure parameter, the pressure correction factor and the temperature correction factor;
Calculating the air mass flow through the throttle valve according to the nominal air mass flow offset calibration setting, the pressure ratio, the Save Vignat influence factor and the throttle valve opening parameter, and outputting the secondary charging air quantity;
the main charge air inflow and the secondary charge air inflow execute difference value calculation, and whether the difference value is larger than a threshold value is judged;
Through receiving the throttle opening parameter, the boost pressure parameter and the post-throttle intake pressure parameter, setting a secondary charging model, calculating, and outputting secondary charging air quantity, the process of calculating the air mass flow flowing through the throttle valve according to the throttle opening information is simplified, when the valve opening is more than 95%, the throttle opening information is required to be introduced when the threshold is set, and different thresholds are calibrated according to different throttle openings to limit, so that false alarm is avoided while the requirement of air quantity safety monitoring is met.
2. The redundancy principle-based engine intake air amount functional safety monitoring method according to claim 1, wherein intake air amount, boost pressure and intake air pressure sensing signals after a throttle valve are respectively acquired by an air flow meter, a boost pressure sensor and an intake air pressure sensor after a throttle valve.
3. The redundancy principle-based engine air inflow functional safety monitoring method according to claim 2, wherein the output signal of the air flow meter is a send signal, and the main charge model calculates the value of the air inflow according to the signal value set calibration quantity and strategy;
the output signals of the boost pressure sensor and the throttle rear intake pressure sensor are analog signals, and the secondary charging model calculates boost pressure and throttle rear intake pressure according to the analog signal value set standard quantity and strategy.
4. The method for safely monitoring the air inflow function of the engine based on the redundancy principle according to claim 1, wherein the safety monitoring strategy corresponding to the decision output specifically comprises the steps of detecting out-of-limit rotation speed in fault response monitoring, stopping a limp mode, closing a power device, triggering a main control system to reset, and enabling the engine to enter a safety mode.
5. An engine air inflow functional safety monitoring system based on a redundancy principle, which is characterized by being used for executing the engine air inflow functional safety monitoring method based on the redundancy principle according to any one of claims 1-4;
the engine air inflow functional safety monitoring system based on the redundancy principle specifically comprises:
the main charging air inflow output module is used for collecting air inflow, supercharging pressure and air inflow pressure after a throttle valve, setting a main charging model, calculating and outputting main charging air inflow;
The secondary charging air inflow output module is used for receiving the throttle opening parameter, the supercharging pressure parameter and the post-throttle intake pressure parameter, setting a secondary charging model, calculating and outputting the secondary charging air inflow;
And the safety monitoring strategy decision output module compares the main charging air inflow with the secondary charging air inflow and outputs a corresponding safety monitoring strategy.
6. An electronic device comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface, the memory are in communication with each other via the communication bus, and wherein the memory has a computer program stored therein, which when executed by the processor, causes the processor to perform the steps of the method according to any of claims 1 to 4.
7. A computer readable storage medium, characterized in that it stores a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of the method of any one of claims 1 to 4.
8. A vehicle, characterized by comprising:
An electronic device for implementing the redundancy principle-based engine intake air amount functional safety monitoring method according to any one of claims 1 to 4;
A processor that runs a program, and when the program is run, performs the steps of the redundancy principle-based engine intake air amount function safety monitoring method according to any one of claims 1 to 4 on data output from the electronic device;
A storage medium storing a program that, when executed, performs the steps of the redundancy principle-based engine intake air amount functional safety monitoring method according to any one of claims 1 to 4 on data output from an electronic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN105986935A (en) * | 2015-02-11 | 2016-10-05 | 联创汽车电子有限公司 | Fuel ejection system of natural gas engine and air inflow computing method |
| CN114673603A (en) * | 2022-04-12 | 2022-06-28 | 中国第一汽车股份有限公司 | Safety monitoring method and device for engine control system, computer equipment and medium |
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| CN114967547B (en) * | 2022-05-23 | 2024-10-18 | 中国第一汽车股份有限公司 | Parameter reproduction system, method, electronic terminal and storage medium |
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| CN1490509A (en) * | 2002-09-04 | 2004-04-21 | 本田技研工业株式会社 | Fault determination device and method for air flow sensor |
| CN105986935A (en) * | 2015-02-11 | 2016-10-05 | 联创汽车电子有限公司 | Fuel ejection system of natural gas engine and air inflow computing method |
| CN114673603A (en) * | 2022-04-12 | 2022-06-28 | 中国第一汽车股份有限公司 | Safety monitoring method and device for engine control system, computer equipment and medium |
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