CN116378866A - EGR module pressure sensor detection method and device, vehicle and storage medium - Google Patents
EGR module pressure sensor detection method and device, vehicle and storage medium Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
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Abstract
The invention discloses a detection method and device of an EGR (exhaust gas Recirculation) module pressure sensor, a vehicle and a storage medium. The EGR module pressure sensor detection method comprises the following steps: when the engine speed, the engine load, the engine speed change rate and the engine load change rate meet set conditions, acquiring air flow flowing into the EGR module and a throttle front pressure value; determining an estimated pressure value at a throat based on the air flow into the EGR module and the pre-throttle pressure value; and acquiring a current pressure value detected by the pressure sensor at the throat, and determining the state of the pressure sensor at the throat of the EGR module according to the current pressure value and the estimated pressure value. The invention realizes accurate detection of the pressure sensor at the throat of the EGR module and improves the detection reliability of the pressure sensor at the throat of the EGR module.
Description
Technical Field
The invention relates to the technical field of EGR (exhaust gas Recirculation) module detection, in particular to an EGR module pressure sensor detection method, an EGR module pressure sensor detection device, a vehicle and a storage medium.
Background
An exhaust gas recirculation system (Exhaust Gas Recirculation, EGR) recirculates a small portion of the exhaust gas produced by a diesel or gasoline engine back to the cylinder. At present, the pressure sensor at the throat of the EGR module can be compared through the front pressure of the throttle valve to judge whether the pressure sensor at the throat has faults or not, but the existing scheme only has faults when the pressure sensor at the throat is larger than the front pressure of the throttle valve, the diagnosis precision is poor, and the diagnosis range is overlarge when the throttle loss of the throttle valve is larger.
Disclosure of Invention
The invention provides a detection method and device for a pressure sensor of an EGR (exhaust gas Recirculation) module, a vehicle and a storage medium, and aims to solve the problems that the diagnosis precision of the pressure sensor at the throat of the existing EGR module is poor and the diagnosis reliability is poorer when the throttle loss of a throttle valve is larger.
According to an aspect of the present invention, there is provided an EGR module pressure sensor detection method including:
when the engine speed, the engine load, the engine speed change rate and the engine load change rate meet set conditions, acquiring air flow flowing into the EGR module and a throttle front pressure value;
determining an estimated pressure value at a throat based on the air flow into the EGR module and the pre-throttle pressure value;
and acquiring a current pressure value detected by the pressure sensor at the throat, and determining the state of the pressure sensor at the throat of the EGR module according to the current pressure value and the estimated pressure value.
Optionally, the engine speed, the engine load, the engine speed change rate, and the engine load change rate satisfy set conditions, including:
the engine speed is in a set speed range and the engine load is in a set load range, and the engine speed change rate is less than a set speed change rate threshold and the engine load change rate is less than a set load change rate threshold.
Optionally, before determining the estimated pressure value at the throat based on the air flow into the EGR module and the pre-throttle pressure value, further comprising:
acquiring an effective flow diameter and an effective flow area of a current throttle valve opening, pipeline diameters of a front throttle valve and a gas inlet point, a throat diameter, a throat sectional area, an outflow coefficient of a throat, an outflow coefficient of the throttle valve, a first compressible coefficient and a second compressible coefficient;
acquiring an excess air ratio and an equivalent air-fuel ratio of the current engine fuel, and determining an air-fuel ratio correction coefficient according to the excess air ratio and the equivalent air-fuel ratio;
determining an estimated pressure value at a throat based on the air flow into the EGR module and the pre-throttle pressure value, comprising:
and determining an estimated pressure value at the throat based on the air flow rate flowing into the EGR module, the pre-throttle pressure value, an effective flow diameter and an effective flow area at a current throttle opening, a pipe diameter of pre-throttle and a gas inlet point, the throat diameter, the throat cross-sectional area, an outflow coefficient of the throat, an outflow coefficient of the throttle, a first compressible coefficient, the second compressible coefficient, and the air-fuel ratio correction coefficient.
Optionally, the determining the air-fuel ratio correction coefficient according to the excess air ratio and the equivalent air-fuel ratio includes:
the air-fuel ratio correction coefficient is determined based on the following formula:
wherein Fac AFR Is an air-fuel ratio correction coefficient; lambda is the excess air factor; AFR is the equivalent air-fuel ratio.
Optionally, the determining the estimated pressure value at the throat based on the air flow rate flowing into the EGR module, the pre-throttle pressure value, the effective flow diameter and effective flow area at the current throttle opening, the pipe diameters of the pre-throttle and the gas inlet, the throat diameter, the throat cross-sectional area, the outflow coefficient of the throat, the outflow coefficient of the throttle, the first compressible coefficient, the second compressible coefficient, and the air-fuel ratio correction coefficient includes:
the estimated pressure value at the laryngeal opening is determined based on the following formula:
wherein p is noz_Sim For the estimated pressure value; q air_VE Air flow into the EGR module; p is p 0 Is the throttle front pressure value; d, d noz Is the laryngeal diameter; a is that noz Is the throat cross-sectional area; d, d TV The effective flow diameter is the effective flow diameter under the current throttle opening; a is that TV Is the effective flow area under the current throttle opening; d is the diameter of the pipeline at the front of the throttle valve and the gas inlet point; c (C) 0 Is the outflow coefficient of the throttle valve; epsilon 0 For the first compressible coefficient; c (C) 1 Is the outflow coefficient of the laryngeal opening; epsilon 1 Is the second compressible coefficient; r is a gas constant; t (T) 0 The temperature value is the temperature value in front of the throttle valve; m is the air molar mass.
Optionally, the determining the state of the pressure sensor at the throat of the EGR module according to the current pressure value and the estimated pressure value includes:
if the current pressure value is larger than the estimated pressure value and the absolute value of the difference between the current pressure value and the estimated pressure value is larger than a first preset pressure limit value, determining that the state of the pressure sensor at the throat of the EGR module exceeds a dynamic diagnosis lower limit fault;
and if the current pressure value is smaller than the estimated pressure value and the absolute value of the difference between the current pressure value and the estimated pressure value is larger than a second preset pressure limit value, determining that the state of the pressure sensor at the throat of the EGR module exceeds the dynamic diagnosis upper limit fault.
According to another aspect of the present invention, there is provided an EGR module pressure sensor detection device including:
an information acquisition module for executing acquisition of an air flow rate flowing into the EGR module and a pre-throttle pressure value when the engine speed, the engine load, the engine speed change rate, and the engine load change rate satisfy set conditions;
an estimated pressure value calculation module for performing a determination of an estimated pressure value at a throat based on the air flow into the EGR module and the pre-throttle pressure value;
and the pressure sensor state determining module is used for acquiring the current pressure value detected by the pressure sensor at the throat and determining the state of the pressure sensor at the throat of the EGR module according to the current pressure value and the estimated pressure value.
Optionally, the engine speed, the engine load, the engine speed change rate and the engine load change rate meet set conditions, specifically:
the engine speed is in a set speed range and the engine load is in a set load range, and the engine speed change rate is less than a set speed change rate threshold and the engine load change rate is less than a set load change rate threshold.
According to another aspect of the present invention, there is provided a vehicle including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the EGR module pressure sensor detection method according to any of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer readable storage medium storing computer instructions for causing a processor to execute the method for detecting an EGR module pressure sensor according to any of the embodiments of the present invention.
According to the technical scheme, when the engine speed, the engine load, the engine speed change rate and the engine load change rate meet set conditions, the air flow flowing into the EGR module and the front throttle pressure value are obtained; determining an estimated pressure value at a throat based on the air flow into the EGR module and the pre-throttle pressure value; and acquiring a current pressure value detected by the pressure sensor at the throat, and determining the state of the pressure sensor at the throat of the EGR module according to the current pressure value and the estimated pressure value. The invention solves the problems of poor diagnosis precision and poorer diagnosis reliability when the throttle loss of the air throttle is larger in the existing pressure sensor at the throat of the EGR module, realizes accurate detection of the pressure sensor at the throat of the EGR module, and improves the detection reliability of the pressure sensor at the throat of the EGR module.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an EGR module pressure sensor detection method provided in accordance with a first embodiment of the present invention;
FIG. 2 is a schematic block diagram of an EGR module adapted according to an embodiment of the present invention;
FIG. 3 is a flow chart of an EGR module pressure sensor detection method provided in accordance with a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of an EGR module pressure sensor detection device according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of a vehicle implementing a method for detecting a pressure sensor of an EGR module according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of an EGR module pressure sensor detection method according to an embodiment of the present invention, where the method may be applied to a case of accurately diagnosing a pressure sensor state at a throat of an EGR module, and the method may be performed by an EGR module pressure sensor detection device, and the EGR module pressure sensor detection device may be implemented in hardware and/or software, and the EGR module pressure sensor detection device may be configured in a vehicle or a post-processing system of the vehicle. Based on the EGR module characteristics of the aftertreatment system, providing the EGR module at the front throttle 10, the throat 20, and the intake manifold 30 as shown in fig. 2, with continued reference to fig. 1 and 2, the EGR module pressure sensor detection method includes:
s110, when the engine speed, the engine load, the engine speed change rate and the engine load change rate meet set conditions, acquiring an air flow rate flowing into the EGR module and a pre-throttle pressure value.
The engine speed, the engine load, the engine speed change rate and the engine load change rate satisfy the setting conditions that the engine speed is in the set speed range, the engine load is in the set load range, the engine speed change rate is smaller than the set speed change rate threshold, the engine load change rate is smaller than the set load change rate threshold, the set speed range, the set load range, the set speed change rate threshold and the set load change rate threshold can be selected and set by a person skilled in the art according to the actual condition of the engine, and the embodiment does not limit the above.
It is understood that the engine is in steady state operation when the engine speed is within the set speed range and the engine load is within the set load range and the engine speed rate of change is less than the set speed rate of change threshold and the engine load rate of change is less than the set load rate of change threshold.
With continued reference to FIG. 2, in accordance with the EGR module hardware characteristics, and the mass conservation theorem, when the engine is in steady state operation, then
q air_VE ＝q air_0 ＝q air_1 (1)
Wherein q air_VE For air flow into the EGR module; q air_0 Is the air flow at the throttle; q air_1 Is the air flow at the throat.
It is known that the air flow rate flowing into the EGR module can be obtained by calculation means such as the existing speed density method, and the present embodiment does not impose any limitation on the acquisition means.
The air density before the throttle, the pressure value before the throttle and the air density of the gas converging point can be obtained by the existing sensor or other calculation modes, and the acquisition means of the embodiment is not limited.
S120, determining an estimated pressure value at the throat based on the air flow flowing into the EGR module and the pre-throttle pressure value.
Specifically, before determining the estimated pressure value at the throat based on the air flow rate into the EGR module and the pre-throttle pressure value, further includes: acquiring an effective flow diameter and an effective flow area of a current throttle valve opening, pipeline diameters of a front throttle valve and a gas inlet point, a throat diameter, a throat sectional area, an outflow coefficient of a throat, an outflow coefficient of the throttle valve, a first compressible coefficient and a second compressible coefficient; acquiring an excess air ratio and an equivalent air-fuel ratio of the current engine fuel, and determining an air-fuel ratio correction coefficient according to the excess air ratio and the equivalent air-fuel ratio; further, an estimated pressure value at the throat is determined based on the air flow into the EGR module, the pre-throttle pressure value, an effective flow diameter and an effective flow area at a current throttle opening, a line diameter of the pre-throttle and gas sink-in points, the throat diameter, the throat cross-sectional area, an outflow coefficient of the throat, an outflow coefficient of the throttle, a first compressible coefficient, the second compressible coefficient, and the air-fuel ratio correction coefficient.
It is known that the air-fuel ratio correction coefficient is determined based on the following formula:
wherein Fac AFR Is an air-fuel ratio correction coefficient; lambda is the excess air factor; AFR is the equivalent air-fuel ratio.
In this embodiment, the estimated pressure value at the laryngeal opening is determined based on the following formula, specifically:
wherein p is noz_Sim For the estimated pressure value; q air_VE Air flow into the EGR module; p is p 0 Is the throttle front pressure value; d, d noz Is the laryngeal diameter; a is that noz Is the throat cross-sectional area; d, d TV The effective flow diameter is the effective flow diameter under the current throttle opening; a is that TV Is the effective flow area under the current throttle opening; d is the diameter of the pipeline at the front of the throttle valve and the gas inlet point; c (C) 0 Is the outflow coefficient of the throttle valve; epsilon 0 For the first compressible coefficient; c (C) 1 Is the outflow coefficient of the laryngeal opening; epsilon 1 Is the second compressible coefficient; r is a gas constant; t (T) 0 The temperature value is the temperature value in front of the throttle valve; m is the air molar mass.
S130, acquiring a current pressure value detected by the pressure sensor at the throat, and determining the state of the pressure sensor at the throat of the EGR module according to the current pressure value and the estimated pressure value.
The state of the pressure sensor at the throat of the EGR module comprises a normal state, and a fault exceeding the dynamic diagnosis upper limit and a fault exceeding the dynamic diagnosis lower limit. The state of the pressure sensor at the throat of the EGR module exceeds the upper limit fault of dynamic diagnosis, namely the pressure sensor at the throat of the EGR module exceeds the detectable maximum pressure value when the pressure value at the throat is dynamically detected; the state of the pressure sensor at the throat of the EGR module exceeds the dynamic diagnosis lower limit fault, namely the pressure sensor at the throat of the EGR module cannot detect a value smaller than the minimum pressure value when the pressure value at the throat is dynamically detected.
Specifically, if the current pressure value is greater than the estimated pressure value and the absolute value of the difference between the current pressure value and the estimated pressure value is greater than a first preset pressure limit value, determining that the state of the pressure sensor at the throat of the EGR module exceeds a dynamic diagnosis lower limit fault; and if the current pressure value is smaller than the estimated pressure value and the absolute value of the difference between the current pressure value and the estimated pressure value is larger than a second preset pressure limit value, determining that the state of the pressure sensor at the throat of the EGR module exceeds the dynamic diagnosis upper limit fault.
According to the technical scheme, when the engine speed, the engine load, the engine speed change rate and the engine load change rate meet set conditions, the air flow flowing into the EGR module and the front throttle pressure value are obtained; determining an estimated pressure value at a throat based on the air flow into the EGR module and the pre-throttle pressure value; and acquiring a current pressure value detected by the pressure sensor at the throat, and determining the state of the pressure sensor at the throat of the EGR module according to the current pressure value and the estimated pressure value. The invention solves the problems of poor diagnosis precision and poorer diagnosis reliability when the throttle loss of the air throttle is larger in the existing pressure sensor at the throat of the EGR module, realizes accurate detection of the pressure sensor at the throat of the EGR module, and improves the detection reliability of the pressure sensor at the throat of the EGR module.
Example two
Fig. 3 is a flowchart of a method for detecting a pressure sensor of an EGR module according to a second embodiment of the present invention, and an alternative implementation manner is provided based on the foregoing embodiment. As shown in fig. 3, the EGR module pressure sensor detection method includes:
s210, when the engine speed is in a set speed range, the engine load is in a set load range, the engine speed change rate is smaller than a set speed change rate threshold value, and the engine load change rate is smaller than a set load change rate threshold value, the air flow flowing into the EGR module and the pre-throttle pressure value are obtained.
S220, obtaining an effective flow diameter and an effective flow area of the throttle valve under the current opening degree of the throttle valve, pipeline diameters of front throttle valve and a fuel gas inflow point, a throat diameter, a throat sectional area, an outflow coefficient of the throat, an outflow coefficient of the throttle valve, a first compressible coefficient and a second compressible coefficient.
Wherein the first compressible coefficient may pass the last time
And->
The interpolation table of the fixed correspondence relationship may be obtained by checking, or the calculation according to 1 may be omitted, which is not limited in this embodiment.
The second compressible coefficient can pass through the previous time
And->
The interpolation table of the fixed correspondence relationship may be obtained by checking, or the calculation according to 1 may be omitted, which is not limited in this embodiment.
Based on the above embodiment, based on the hardware characteristics of the existing EGR module, the pre-throttle pressure value, the pre-throttle air density, the effective flow diameter and the effective flow area under the current throttle opening, the pipeline diameters of the pre-throttle and the gas inlet point, the outflow coefficient of the throttle, and the first compressible coefficient are obtained, and then the air flow at the throttle can be calculated by the following formula:
wherein p is 0 Is the throttle front pressure value; d, d TV The effective flow diameter is the effective flow diameter under the current throttle opening; a is that TV Is the effective flow area under the current throttle opening; d is the diameter of the pipeline at the front of the throttle valve and the gas inlet point; c (C) 0 Is the outflow coefficient of the throttle valve; epsilon 0 For the first compressible coefficient; ρ 0 -the throttle front air density; p is p v Is a virtual pressure value of the gas sink.
It can be understood that in the formula (4), the virtual pressure value of the gas inlet is unknown, and the virtual pressure value of the gas inlet can be calculated by combining the formula (1) and the formula (4).
S230, acquiring an excess air ratio and an equivalent air-fuel ratio of the current engine fuel, and determining an air-fuel ratio correction coefficient according to the excess air ratio and the equivalent air-fuel ratio.
It is known that the air-fuel ratio correction coefficient is determined based on the following formula:
wherein Fac AFR Is an air-fuel ratio correction coefficient; lambda is the excess air factor; AFR is the equivalent air-fuel ratio.
S240, determining an estimated pressure value at the throat based on the air flow flowing into the EGR module, the pre-throttle pressure value, the effective flow diameter and the effective flow area at the current throttle opening, the pipeline diameters of the pre-throttle and the gas inlet point, the throat diameter, the throat sectional area, the outflow coefficient of the throat, the outflow coefficient of the throttle, the first compressible coefficient, the second compressible coefficient and the air-fuel ratio correction coefficient.
Based on the above embodiment, based on the hardware characteristics of the existing EGR module, the gas density, the throat diameter, the throat cross-sectional area, the outflow coefficient of the throat, and the second compressible coefficient of the gas sink are obtained, and based on the virtual pressure value of the gas sink, the gas density of the gas sink, the throat diameter, the throat cross-sectional area, the outflow coefficient of the throat, the second compressible coefficient, and the air-fuel ratio correction coefficient, the air flow at the throat is determined based on the following formula:
wherein ρ is v A gas density for the gas sink; d, d noz Is the laryngeal diameter; a is that noz Is the throat cross-sectional area; c (C) 1 Is the outflow coefficient of the laryngeal opening; epsilon 1 Is the second compressibility factor.
The estimated pressure value at the throat may be obtained by simultaneous equations (2), (3) and (4), that is, the estimated pressure value at the throat may be determined based on the air flow rate flowing into the EGR module, the pre-throttle pressure value, the effective flow diameter and the effective flow area at the current throttle opening, the pipe diameters of the pre-throttle and gas inflow points, the throat diameter, the throat cross-sectional area, the outflow coefficient of the throat, the outflow coefficient of the throttle, the first compressible coefficient, the second compressible coefficient and the air-fuel ratio correction coefficient, specifically, see equation (5) for:
wherein R is a gas constant; t (T) 0 The temperature value is the temperature value in front of the throttle valve; m is the air molar mass.
S250, if the current pressure value is larger than the estimated pressure value and the absolute value of the difference between the current pressure value and the estimated pressure value is larger than a first preset pressure limit value, determining that the state of the pressure sensor at the throat of the EGR module exceeds a dynamic diagnosis lower limit fault;
and if the current pressure value is smaller than the estimated pressure value and the absolute value of the difference between the current pressure value and the estimated pressure value is larger than a second preset pressure limit value, determining that the state of the pressure sensor at the throat of the EGR module exceeds the dynamic diagnosis upper limit fault.
According to the technical scheme, the fault of the pressure sensor at the throat of the EGR module can still be accurately judged by utilizing the application characteristics of the air flowmeter of the EGR module on the engine, and the mass balance and energy balance principles of the front part, the throat and the air inlet manifold of each position, when the throttle valve is in a small opening range or the air inlet manifold has larger pressure loss, so that the accurate diagnosis of the state of the pressure sensor at the throat of the EGR module is realized.
Example III
Fig. 4 is a schematic structural diagram of a detection device for an EGR module pressure sensor according to a third embodiment of the present invention. As shown in fig. 4, the EGR module pressure sensor detection device includes:
an information acquisition module 410 for executing acquisition of an air flow rate flowing into the EGR module and a pre-throttle pressure value when the engine speed, the engine load, the engine speed change rate, and the engine load change rate satisfy set conditions;
an estimated pressure value calculation module 420 for performing a determination of an estimated pressure value at the throat based on the air flow into the EGR module and the pre-throttle pressure value;
the pressure sensor state determining module 430 is configured to obtain a current pressure value detected by the pressure sensor at the throat, and determine a state of the pressure sensor at the throat of the EGR module according to the current pressure value and the estimated pressure value.
Optionally, the engine speed, the engine load, the engine speed change rate and the engine load change rate meet set conditions, specifically:
the engine speed is in a set speed range and the engine load is in a set load range, and the engine speed change rate is less than a set speed change rate threshold and the engine load change rate is less than a set load change rate threshold.
Optionally, the EGR module pressure sensor detection device further includes:
the first coefficient acquisition module is used for acquiring an effective flow diameter and an effective flow area of the throttle valve at present, a pipeline diameter of a front throttle valve and a fuel gas inflow point, a throat diameter, a throat sectional area, an outflow coefficient of the throat, an outflow coefficient of the throttle valve, a first compressible coefficient and a second compressible coefficient;
a second coefficient acquisition module for performing acquisition of an excess air coefficient and an equivalent air-fuel ratio of a current engine fuel, and determining an air-fuel ratio correction coefficient based on the excess air coefficient and the equivalent air-fuel ratio;
determining an estimated pressure value at the throat based on the air flow into the EGR module and the pre-throttle pressure value, in particular for:
and determining an estimated pressure value at the throat based on the air flow rate flowing into the EGR module, the pre-throttle pressure value, an effective flow diameter and an effective flow area at a current throttle opening, a pipe diameter of pre-throttle and a gas inlet point, the throat diameter, the throat cross-sectional area, an outflow coefficient of the throat, an outflow coefficient of the throttle, a first compressible coefficient, the second compressible coefficient, and the air-fuel ratio correction coefficient.
Optionally, the determining the air-fuel ratio correction coefficient according to the excess air ratio and the equivalent air-fuel ratio includes:
the air-fuel ratio correction coefficient is determined based on the following formula:
wherein Fac AFR Is an air-fuel ratio correction coefficient; lambda is the excess air factor; AFR is the equivalent air-fuel ratio.
Optionally, the method further includes determining an estimated pressure value at the throat based on the air flow into the EGR module, the pre-throttle pressure value, an effective flow diameter and an effective flow area at a current throttle opening, a line diameter at pre-throttle and gas inlet points, the throat diameter, the throat cross-sectional area, an outflow coefficient of the throat, an outflow coefficient of the throttle, a first compressible coefficient, the second compressible coefficient, and the air-fuel ratio correction coefficient. The method is specifically used for:
the estimated pressure value at the laryngeal opening is determined based on the following formula:
wherein p is noz_Sim For the estimated pressure value; q air_VE Air flow into the EGR module; p is p 0 Is the throttle front pressure value; d, d noz Is the laryngeal diameter; a is that noz Is the throat cross-sectional area; d, d TV The effective flow diameter is the effective flow diameter under the current throttle opening; a is that TV Is the effective flow area under the current throttle opening; d is the diameter of the pipeline at the front of the throttle valve and the gas inlet point; c (C) 0 Is the outflow coefficient of the throttle valve; epsilon 0 For the first compressible coefficient; c (C) 1 Is the outflow coefficient of the laryngeal opening; epsilon 1 Is the second compressible coefficient; r is a gas constant; t (T) 0 The temperature value is the temperature value in front of the throttle valve; m is the air molar mass.
Optionally, the pressure sensor state determining module 430 is specifically configured to:
if the current pressure value is larger than the estimated pressure value and the absolute value of the difference between the current pressure value and the estimated pressure value is larger than a first preset pressure limit value, determining that the state of the pressure sensor at the throat of the EGR module exceeds a dynamic diagnosis lower limit fault;
and if the current pressure value is smaller than the estimated pressure value and the absolute value of the difference between the current pressure value and the estimated pressure value is larger than a second preset pressure limit value, determining that the state of the pressure sensor at the throat of the EGR module exceeds the dynamic diagnosis upper limit fault.
The EGR module pressure sensor detection device provided by the embodiment of the invention can execute the EGR module pressure sensor detection method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the EGR module pressure sensor detection method.
Example IV
Fig. 5 shows a schematic structural diagram of a vehicle 510 that may be used to implement an embodiment of the invention. Vehicles include digital computers representing various forms such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Vehicles also include devices that represent various forms of mobile devices, such as personal digital assistants, cellular telephones, smart phones, wearable devices (e.g., helmets, eyeglasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 5, the vehicle 510 includes at least one processor 511, and a memory, such as a Read Only Memory (ROM) 512, a Random Access Memory (RAM) 513, etc., communicatively connected to the at least one processor 511, wherein the memory stores computer programs executable by the at least one processor, and the processor 511 may perform various suitable actions and processes according to the computer programs stored in the Read Only Memory (ROM) 512 or the computer programs loaded from the storage unit 518 into the Random Access Memory (RAM) 513. In the RAM 513, various programs and data required for the operation of the vehicle 510 may also be stored. The processor 511, the ROM 512, and the RAM 513 are connected to each other by a bus 514. An input/output (I/O) interface 515 is also connected to bus 514.
Various components in the vehicle 510 are connected to the I/O interface 515, including: an input unit 516 such as a keyboard, a mouse, etc.; an output unit 517 such as various types of displays, speakers, and the like; a storage unit 518 such as a magnetic disk, optical disk, etc.; and a communication unit 519 such as a network card, modem, wireless communication transceiver, or the like. The communication unit 519 allows the vehicle 510 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunications networks.
The processor 511 may be a variety of general and/or special purpose processing components with processing and computing capabilities. Some examples of processor 511 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 511 performs the various methods and processes described above, such as the EGR module pressure sensor detection method.
In some embodiments, the EGR module pressure sensor detection method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as storage unit 518. In some embodiments, some or all of the computer program may be loaded and/or installed onto the vehicle 510 via the ROM 512 and/or the communication unit 519. When a computer program is loaded into RAM 513 and executed by processor 511, one or more steps of the EGR module pressure sensor detection method described above may be performed. Alternatively, in other embodiments, processor 511 may be configured to perform the EGR module pressure sensor detection method in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a vehicle having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and pointing device (e.g., a mouse or a trackball) by which a user can provide input to the vehicle. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An EGR module pressure sensor detection method, characterized by comprising:
when the engine speed, the engine load, the engine speed change rate and the engine load change rate meet set conditions, acquiring air flow flowing into the EGR module and a throttle front pressure value;
determining an estimated pressure value at a throat based on the air flow into the EGR module and the pre-throttle pressure value;
and acquiring a current pressure value detected by the pressure sensor at the throat, and determining the state of the pressure sensor at the throat of the EGR module according to the current pressure value and the estimated pressure value.
2. The EGR module pressure sensor detection method according to claim 1, characterized in that the engine speed, the engine load, the engine speed change rate, and the engine load change rate satisfy set conditions, comprising:
the engine speed is in a set speed range and the engine load is in a set load range, and the engine speed change rate is less than a set speed change rate threshold and the engine load change rate is less than a set load change rate threshold.
3. The EGR module pressure sensor detection method of claim 1, further comprising, prior to determining an estimated pressure value at a throat based on the flow of air into an EGR module and the pre-throttle pressure value:
acquiring an effective flow diameter and an effective flow area of a current throttle valve opening, pipeline diameters of a front throttle valve and a gas inlet point, a throat diameter, a throat sectional area, an outflow coefficient of a throat, an outflow coefficient of the throttle valve, a first compressible coefficient and a second compressible coefficient;
acquiring an excess air ratio and an equivalent air-fuel ratio of the current engine fuel, and determining an air-fuel ratio correction coefficient according to the excess air ratio and the equivalent air-fuel ratio;
determining an estimated pressure value at a throat based on the air flow into the EGR module and the pre-throttle pressure value, comprising:
and determining an estimated pressure value at the throat based on the air flow rate flowing into the EGR module, the pre-throttle pressure value, an effective flow diameter and an effective flow area at a current throttle opening, a pipe diameter of pre-throttle and a gas inlet point, the throat diameter, the throat cross-sectional area, an outflow coefficient of the throat, an outflow coefficient of the throttle, a first compressible coefficient, the second compressible coefficient, and the air-fuel ratio correction coefficient.
4. The EGR module pressure sensor detection method according to claim 3, characterized in that the determining an air-fuel ratio correction coefficient from the excess air ratio and the equivalent air-fuel ratio includes:
the air-fuel ratio correction coefficient is determined based on the following formula:
wherein Fac AFR Is an air-fuel ratio correction coefficient; lambda is the excess air factor; AFR is the equivalent air-fuel ratio.
5. The EGR module pressure sensor detection method of claim 4, wherein the determining an estimated pressure value at a throat based on the flow rate of air flowing into an EGR module, the pre-throttle pressure value, an effective flow diameter and an effective flow area at a current throttle opening, a line diameter of pre-throttle and a gas inlet, the throat diameter, the throat cross-sectional area, an outflow coefficient of a throat, an outflow coefficient of a throttle, a first compressibility coefficient, the second compressibility coefficient, and the air-fuel ratio correction coefficient, comprises:
the estimated pressure value at the laryngeal opening is determined based on the following formula:
wherein p is noz_Sim For the estimated pressure value; q air_VE Air flow into the EGR module; p is p 0 Is the throttle front pressure value; d, d noz Is the laryngeal diameter; a is that noz Is the throat cross-sectional area; d, d TV The effective flow diameter is the effective flow diameter under the current throttle opening; a is that TV Is the effective flow area under the current throttle opening; d is the diameter of the pipeline at the front of the throttle valve and the gas inlet point; c (C) 0 For the outflow coefficient of the throttle valve；ε 0 For the first compressible coefficient; c (C) 1 Is the outflow coefficient of the laryngeal opening; epsilon 1 Is the second compressible coefficient; r is a gas constant; t (T) 0 The temperature value is the temperature value in front of the throttle valve; m is the air molar mass.
6. The EGR module pressure sensor detection method of claim 1, wherein the determining a state of the pressure sensor at the throat of the EGR module from the current pressure value and the estimated pressure value includes:
if the current pressure value is larger than the estimated pressure value and the absolute value of the difference between the current pressure value and the estimated pressure value is larger than a first preset pressure limit value, determining that the state of the pressure sensor at the throat of the EGR module exceeds a dynamic diagnosis lower limit fault;
and if the current pressure value is smaller than the estimated pressure value and the absolute value of the difference between the current pressure value and the estimated pressure value is larger than a second preset pressure limit value, determining that the state of the pressure sensor at the throat of the EGR module exceeds the dynamic diagnosis upper limit fault.
7. An EGR module pressure sensor detection device, characterized by comprising:
an information acquisition module for executing acquisition of an air flow rate flowing into the EGR module and a pre-throttle pressure value when the engine speed, the engine load, the engine speed change rate, and the engine load change rate satisfy set conditions;
an estimated pressure value calculation module for performing a determination of an estimated pressure value at a throat based on the air flow into the EGR module and the pre-throttle pressure value;
and the pressure sensor state determining module is used for acquiring the current pressure value detected by the pressure sensor at the throat and determining the state of the pressure sensor at the throat of the EGR module according to the current pressure value and the estimated pressure value.
8. The EGR module pressure sensor detection device according to claim 7, wherein the engine speed, the engine load, the engine speed change rate, and the engine load change rate satisfy set conditions, specifically:
the engine speed is in a set speed range and the engine load is in a set load range, and the engine speed change rate is less than a set speed change rate threshold and the engine load change rate is less than a set load change rate threshold.
9. A vehicle, characterized in that the vehicle comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the EGR module pressure sensor detection method of any of claims 1-6.
10. A computer readable storage medium storing computer instructions for causing a processor to execute the EGR module pressure sensor detection method according to any one of claims 1 to 6.
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