Desorption flow checking method, device and equipment and storage medium

Abstract

The application discloses a desorption flow checking method, device, equipment and storage medium, relates to the field of automobile engineering technology, and the desorption flow checking method comprises the following steps: determining a first desorption flow according to a carbon tank electromagnetic valve pressure difference and a carbon tank electromagnetic valve mapping relationship, wherein the first desorption flow is a desorption flow generated under first load operation; determining a second desorption flow according to a venturi pressure difference and a venturi valve mapping relationship, wherein the second desorption flow is a desorption flow generated under second load operation, and the second load is greater than the first load; and determining a desorption flow checking result according to the first desorption flow and the second desorption flow. By determining the pressure drop from the air inlet to the carbon tank electromagnetic valve gas inlet, and in combination with the inherent characteristics (pressure-flow curve) of the carbon tank electromagnetic valve and the venturi valve and the like, the desorption flow of the whole vehicle can be accurately calculated, and then it is realized that whether the desorption flow of the fuel system meets the requirements is quickly and accurately evaluated in the early stage of the whole vehicle development.

Description

Technical Field

[0001] This application relates to the field of automotive engineering technology, and in particular to desorption flow verification methods, apparatus, equipment and storage media. Background Technology

[0002] Vehicle emission standards are national regulations, with both fuel evaporation emissions and refueling emissions requiring carbon canister cleaning. In emissions testing, incomplete carbon canister cleaning directly risks exceeding vehicle emission standards. Therefore, achieving the required carbon canister desorption flow rate is a crucial indicator in vehicle development. Assessing whether the fuel system desorption flow rate meets requirements in the early stages of vehicle development can significantly save development time and costs. Although existing technologies provide a method for verifying whether the vehicle's desorption flow rate meets requirements, several problems remain in practice. First, this method requires extensive calculations and complex data processing, which is time-consuming and costly for vehicle development. Second, this method is dependent on the design and selection of engine and fuel system components; improper design or selection may result in insufficient desorption flow rate, affecting the vehicle's emissions performance. Finally, this method has limited guidance for determining the overall vehicle design and engine operating condition selection; it cannot directly reflect whether the current design meets emission requirements or identify areas for improvement. Therefore, how to quickly and accurately assess whether the fuel system desorption flow rate meets requirements in the early stages of vehicle development has become an urgent problem to solve. Summary of the Invention

[0003] The main objective of this application is to provide a desorption flow verification method, apparatus, device, and storage medium, which aims to solve the technical problem of how to quickly and accurately assess whether the fuel system desorption flow meets the requirements in the early stages of vehicle development.

[0004] To achieve the above objectives, this application proposes a desorption flow rate verification method, which includes:

[0005] The first desorption flow rate is determined based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve. The first desorption flow rate is the desorption flow rate generated under the first load operation.

[0006] The second desorption flow rate is determined based on the pressure difference of the venturi tube and the mapping relationship of the venturi valve. The second desorption flow rate is the desorption flow rate generated under the second load operation, which is greater than the first load.

[0007] The desorption flow rate verification result is determined based on the first desorption flow rate and the second desorption flow rate.

[0008] In one embodiment, before determining the first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve, the method further includes:

[0009] Desorption inlet pressure is determined based on atmospheric pressure and desorption resistance;

[0010] The desorption outlet pressure is determined based on the intake manifold mapping relationship between the current engine operating condition and the target test condition;

[0011] The pressure difference of the carbon canister solenoid valve is obtained based on the desorption inlet pressure and the desorption outlet pressure.

[0012] In one embodiment, before determining the desorption outlet pressure based on the intake manifold mapping relationship between the current engine operating condition and the target test condition, the method further includes:

[0013] Under various engine operating conditions, the target test conditions are simulated based on the manifold pressure-speed mapping relationship, resulting in multiple simulated desorption flow rates and the intake manifold mapping relationship of the target test conditions.

[0014] By comparing multiple simulated desorption flow rates, the current engine operating condition is determined.

[0015] In one embodiment, determining the first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve includes:

[0016] Multiple flow values ​​corresponding to the target test condition are determined based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve.

[0017] The first desorption flow rate is obtained by integrating multiple flow rates corresponding to the target test condition.

[0018] In one embodiment, determining the desorption flow rate verification result based on the first desorption flow rate and the second desorption flow rate includes:

[0019] Determine the target desorption flow rate based on the first desorption flow rate and the second desorption flow rate;

[0020] The target desorption flow rate is compared with the required desorption flow rate to obtain the desorption flow rate comparison result;

[0021] The desorption flow rate verification result is determined based on the desorption flow rate comparison results.

[0022] In one embodiment, determining the desorption flow rate verification result based on the desorption flow rate comparison result includes:

[0023] When the desorption flow comparison result shows that the target desorption flow is less than the required desorption flow, the desorption flow verification result is determined to be an insufficient desorption flow result.

[0024] When the desorption flow comparison result shows that the target desorption flow is greater than or equal to the required desorption flow, the desorption flow verification result is determined to be a normal desorption flow result.

[0025] In one embodiment, after determining that the desorption flow verification result is insufficient when the desorption flow comparison result shows that the target desorption flow is less than the required desorption flow, the method further includes:

[0026] When the desorption flow rate verification result is insufficient, the current engine operating condition is adjusted to obtain the updated engine operating condition.

[0027] Determine the corresponding update desorption flow rate based on the updated engine operating conditions;

[0028] The updated desorption flow verification result is obtained based on the updated desorption flow and the required desorption flow.

[0029] Furthermore, to achieve the above objectives, this application also proposes a desorption flow rate verification device, which includes:

[0030] The processing module is used to determine the first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve and the carbon canister solenoid valve. The first desorption flow rate is the desorption flow rate generated under the first load operation.

[0031] The processing module is also used to determine the second desorption flow rate based on the Venturi pressure difference and the Venturi valve mapping relationship. The second desorption flow rate is the desorption flow rate generated under the second load operation, where the second load is greater than the first load.

[0032] The verification module is used to determine the desorption flow verification result based on the first desorption flow and the second desorption flow.

[0033] In addition, to achieve the above objectives, this application also proposes a desorption flow verification device, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the desorption flow verification method as described above.

[0034] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the desorption flow verification method described above.

[0035] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the desorption flow verification method described above.

[0036] This application determines a first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and its mapping relationship, where the first desorption flow rate is the desorption flow rate generated under a first load operation. A second desorption flow rate is determined based on the pressure difference of the venturi valve and its mapping relationship, where the second desorption flow rate is the desorption flow rate generated under a second load operation, where the second load is greater than the first load. A desorption flow rate verification result is determined based on the first and second desorption flow rates. By determining the pressure drop from the atmospheric inlet to the carbon canister solenoid valve inlet, and combining this with the inherent characteristics (pressure-flow curves) of the selected components such as the carbon canister solenoid valve and the venturi valve, the desorption flow rate of the entire vehicle can be accurately calculated. This allows for a rapid and accurate assessment of whether the fuel system's desorption flow rate meets requirements in the early stages of vehicle development. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A flowchart illustrating the first embodiment of the desorption flow rate verification method of this application;

[0040] Figure 2 This is a flowchart illustrating Embodiment 2 of the desorption flow rate verification method of this application.

[0041] Figure 3 A simplified flowchart illustrating the desorption flow rate verification method provided in Embodiment 1 of this application;

[0042] Figure 4 This is a schematic diagram of the module structure of the desorption flow verification device according to an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the device structure of the hardware operating environment involved in the desorption flow verification method in the embodiments of this application.

[0044] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0046] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0047] The main solution of this application embodiment is as follows: a first desorption flow rate is determined based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve and the carbon canister solenoid valve. The first desorption flow rate is the desorption flow rate generated under the first load operation. A second desorption flow rate is determined based on the pressure difference of the venturi tube and the mapping relationship between the venturi valve and the venturi valve. The second desorption flow rate is the desorption flow rate generated under the second load operation, which is greater than the first load. A desorption flow rate verification result is determined based on the first desorption flow rate and the second desorption flow rate.

[0048] Vehicle emission standards are national regulations, with both fuel evaporation emissions and refueling emissions requiring carbon canister cleaning. In emissions testing, incomplete carbon canister cleaning directly risks exceeding vehicle emission standards. Therefore, achieving the required carbon canister desorption flow rate is a crucial indicator in vehicle development. Assessing whether the fuel system desorption flow rate meets requirements in the early stages of vehicle development can significantly save development time and costs. Although existing technologies provide a method for verifying whether the vehicle's desorption flow rate meets requirements, several problems remain in practice. First, this method requires extensive calculations and complex data processing, which is time-consuming and costly for vehicle development. Second, this method is dependent on the design and selection of engine and fuel system components; improper design or selection may result in insufficient desorption flow rate, affecting the vehicle's emissions performance. Finally, this method has limited guidance for determining the overall vehicle design and engine operating condition selection; it cannot directly reflect whether the current design meets emission requirements or identify areas for improvement. Therefore, how to quickly and accurately assess whether the fuel system desorption flow rate meets requirements in the early stages of vehicle development has become an urgent problem to solve.

[0049] This application determines a first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and its mapping relationship, where the first desorption flow rate is the desorption flow rate generated under a first load operation. A second desorption flow rate is determined based on the pressure difference of the venturi valve and its mapping relationship, where the second desorption flow rate is the desorption flow rate generated under a second load operation, where the second load is greater than the first load. A desorption flow rate verification result is determined based on the first and second desorption flow rates. By determining the pressure drop from the atmospheric inlet to the carbon canister solenoid valve inlet, and combining this with the inherent characteristics (pressure-flow curves) of the selected components such as the carbon canister solenoid valve and the venturi valve, the desorption flow rate of the entire vehicle can be accurately calculated. This allows for a rapid and accurate assessment of whether the fuel system's desorption flow rate meets requirements in the early stages of vehicle development.

[0050] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or a deattached traffic verification device capable of performing the above functions. The following description uses a deattached traffic verification device as the executing entity to illustrate this embodiment and the subsequent embodiments.

[0051] Based on this, embodiments of this application provide a method for verifying desorption flow rate, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the desorption flow verification method of this application.

[0052] In this embodiment, the desorption flow rate verification method includes steps S10 to S30:

[0053] Step S10: Determine the first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve and the carbon canister solenoid valve. The first desorption flow rate is the desorption flow rate generated under the first load operation.

[0054] It is understandable that the pressure difference of the carbon canister solenoid valve refers to the pressure difference between the inlet and outlet ends of the carbon canister solenoid valve, the mapping relationship of the carbon canister solenoid valve refers to the mapping relationship between the pressure and flow of the carbon canister solenoid valve, that is, the pressure-flow characteristic curve of the carbon canister solenoid valve body, the first desorption flow rate refers to the low desorption flow rate, and the first load refers to the lower engine operating load.

[0055] In practice, the pressure values ​​at the inlet and outlet of the carbon canister solenoid valve are obtained, and the difference between the pressure values ​​at the inlet and outlet of the carbon canister solenoid valve is calculated to obtain the pressure difference between the inlet and outlet of the carbon canister solenoid valve. Then, the flow rate value corresponding to the pressure difference between the inlet and outlet of the carbon canister solenoid valve is found through the mapping relationship between the pressure and flow rate of the carbon canister solenoid valve, so as to obtain the low desorption flow rate of the engine. The low desorption flow rate refers to the flow rate of fuel vapor released from the carbon canister to the engine intake manifold when the carbon canister solenoid valve is open under low engine load and speed.

[0056] In one feasible implementation, steps A11 to A13 may be included before step S10:

[0057] Step A11: Determine the desorption inlet pressure based on atmospheric pressure and desorption resistance;

[0058] Understandably, atmospheric pressure refers to the pressure of the atmosphere on a unit area, desorption resistance refers to the flow resistance parameters of the fuel system's pipelines and valve bodies, and desorption inlet pressure refers to the pressure at the inlet end of the carbon canister solenoid valve.

[0059] In practical implementation, in order to accurately calculate the pressure at the inlet of the carbon canister solenoid valve, it is necessary to consider the resistance of the fuel system pipeline and valve body, and then collect the flow resistance parameters of the fuel system pipeline and valve body. Then, the pressure at the inlet of the carbon canister solenoid valve is obtained by calculating the difference between the atmospheric pressure per unit area and the flow resistance parameters of the fuel system pipeline and valve body.

[0060] Step A12: Determine the desorption outlet pressure based on the intake manifold mapping relationship between the current engine operating condition and the target test condition;

[0061] It is understandable that the current engine operating condition refers to the optimal operating condition determined by engine selection, the target test condition refers to the standard test condition (WLTC, World Light Duty Test Cycle), the intake manifold mapping relationship refers to the intake manifold pressure-speed curve (at a specific temperature) under the WLTC condition, and the desorption outlet pressure refers to the pressure at the inlet and outlet of the carbon canister solenoid valve.

[0062] In practice, based on the engine speed corresponding to the current optimal engine operating condition, the intake manifold pressure corresponding to the engine speed corresponding to the current optimal engine operating condition is found through the intake manifold pressure-speed curve under WLTC conditions, thus obtaining the pressure at the inlet and outlet of the carbon canister solenoid valve.

[0063] In one feasible implementation, steps B121-B122 may be included before step A12:

[0064] Step B121: Under various engine operating conditions, simulate the target test conditions based on the manifold pressure-speed mapping relationship to obtain multiple simulated desorption flow rates and the intake manifold mapping relationship of the target test conditions.

[0065] It is understandable that "each engine operating condition" refers to all operating conditions of the engine, including WLTC operating condition; "manifold pressure-speed mapping relationship" refers to the intake manifold pressure-speed mapping relationship under all operating conditions of the engine; and "simulated desorption flow rate" refers to the simulated desorption flow rate corresponding to each engine operating condition.

[0066] In practice, under all engine operating conditions, simulation calculations are performed based on the intake manifold pressure-speed mapping relationship under all engine operating conditions to obtain the high and low desorption flow rates corresponding to each engine operating condition, i.e., the desorption flow rates corresponding to each engine operating condition, as well as the intake manifold pressure-speed curve (at a specific temperature) under WLTC conditions.

[0067] Step B122: Compare multiple simulated desorption flow rates to determine the current engine operating condition.

[0068] Understandably, by using a computational model, the high and low desorption flow rates of the fuel system are simulated under different engine selection points and component designs. Then, by comparing all the simulated desorption flow rates, and evaluating them according to emission regulations, fuel economy, and engine performance standards, the optimal engine operating conditions can be found.

[0069] Step A13: Obtain the pressure difference of the carbon canister solenoid valve based on the desorption inlet pressure and the desorption outlet pressure.

[0070] Understandably, the pressure difference between the inlet and outlet of the carbon canister solenoid valve is calculated based on the pressure difference at the inlet and outlet.

[0071] In one feasible implementation, step S10 may include steps C11-C12:

[0072] Step C11: Determine multiple flow values ​​corresponding to the target test condition based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve;

[0073] It is understandable that the flow rate value refers to the flow rate corresponding to the pressure difference of the carbon canister solenoid valve.

[0074] In practical implementation, the flow rate corresponding to the pressure difference between the inlet and outlet of the carbon canister solenoid valve is found in the pressure-flow characteristic curve of the carbon canister solenoid valve body, based on the mapping relationship between the pressure difference between the inlet and outlet of the carbon canister solenoid valve. This yields the flow rate value corresponding to the WLTC operating condition.

[0075] Step C12: Integrate the multiple flow values ​​corresponding to the target test condition to obtain the first desorption flow rate.

[0076] Understandably, the low desorption flow rate is obtained by integrating all flow rates corresponding to the WLTC operating condition. For example, if the WLTC operating condition lasts for 1800 seconds, it is divided into 10-second time intervals (a total of 180 time intervals). For each time interval, the absolute pressure at the inlet of the carbon canister solenoid valve is calculated based on the intake manifold pressure P1 at that time point, and the flow rate is calculated using the pressure-flow characteristic curve of the carbon canister solenoid valve. For the first time interval: assuming a flow rate of 0.5 L / min and a time interval width of 10 seconds, the volumetric flow rate is 0.5 × 160 × 10 = 0.0833 L. For the second time interval: assuming a flow rate of 0.6 L / min, the volumetric flow rate is calculated similarly... For the 180th time interval: assuming a flow rate of 0.4 L / min, the volumetric flow rate is calculated similarly. The volumetric flow rates within all time intervals are summed to obtain the low desorption flow rate for the entire WLTC operating condition.

[0077] Step S20: Determine the second desorption flow rate based on the Venturi pressure difference and the Venturi valve mapping relationship. The second desorption flow rate is the desorption flow rate generated under the second load operation, and the second load is greater than the first load.

[0078] It is understandable that the Venturi pressure difference refers to the pressure difference between the inlet and outlet sides of the Venturi valve, the Venturi valve mapping relationship refers to the mapping relationship between the flow rate and pressure of the Venturi valve, that is, the Venturi valve flow-pressure characteristic curve, the second desorption flow rate refers to the high desorption flow rate, and the second load refers to the higher engine operating load.

[0079] In practice, the pressure values ​​of the venturi valve's intake and exhaust sides are obtained, and the difference between the pressure values ​​of the venturi valve's intake and exhaust sides is calculated to obtain the pressure difference between the venturi valve's intake and exhaust sides. Then, the flow rate value corresponding to the pressure difference between the venturi valve's intake and exhaust sides is found through the mapping relationship between the venturi valve's flow rate and pressure, and the high desorption flow rate of the engine is obtained. The high desorption flow rate refers to the flow rate of fuel vapor released from the carbon canister to the engine intake manifold through auxiliary equipment such as the venturi valve under high engine load and speed.

[0080] Step S30: Determine the desorption flow rate verification result based on the first desorption flow rate and the second desorption flow rate.

[0081] It is understandable that the desorption flow verification results include results of insufficient desorption flow and results of normal desorption flow.

[0082] In practice, the desorption flow rates of the entire fuel system are accumulated based on the low and high desorption flow rates. Then, the desorption flow rate of the entire fuel system is compared with the required flow rate for carbon canister cleaning. If the desorption flow rate of the entire fuel system is less than the required flow rate for carbon canister cleaning, it indicates that the desorption flow rate of the entire fuel system corresponding to the selected point under the current engine operating condition does not meet the requirements for carbon canister cleaning, i.e., the desorption flow rate verification result is insufficient. If the desorption flow rate of the entire fuel system is greater than or equal to the required flow rate for carbon canister cleaning, it indicates that the desorption flow rate of the entire fuel system corresponding to the selected point under the current engine operating condition meets the requirements for carbon canister cleaning, i.e., the desorption flow rate verification result is normal.

[0083] This embodiment determines the first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and its mapping relationship. The first desorption flow rate is the desorption flow rate generated under the first load operation. The second desorption flow rate is determined based on the pressure difference of the venturi valve and its mapping relationship. The second desorption flow rate is the desorption flow rate generated under the second load operation, which is greater than the first load. The desorption flow rate verification result is determined based on the first and second desorption flow rates. By determining the pressure drop from the atmospheric inlet to the carbon canister solenoid valve inlet, and combining this with the inherent characteristics (pressure-flow curves) of the selected components such as the carbon canister solenoid valve and the venturi valve, the desorption flow rate of the entire vehicle can be accurately calculated. This allows for a rapid and accurate assessment of whether the fuel system's desorption flow rate meets the requirements in the early stages of vehicle development.

[0084] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 The desorption flow rate verification method further includes steps S31 to S33 in step S30:

[0085] Step S31: Determine the target desorption flow rate based on the first desorption flow rate and the second desorption flow rate;

[0086] It is understandable that the target desorption flow rate refers to the desorption flow rate of the entire fuel system. The desorption flow rate of the entire fuel system is obtained by summing the low and high desorption flow rates.

[0087] Step S32: Compare the target desorption flow rate with the required desorption flow rate to obtain the desorption flow rate comparison result;

[0088] It is understandable that the required desorption flow rate refers to the required flow rate for carbon canister cleaning, and the desorption flow rate comparison result refers to the comparison result of whether the desorption flow rate of the entire fuel system meets the carbon canister cleaning requirements.

[0089] In practice, the desorption flow rate of the entire fuel system is compared with the required flow rate for carbon canister cleaning. If the desorption flow rate of the entire fuel system is less than the required flow rate for carbon canister cleaning, the desorption flow rate comparison result indicates that the desorption flow rate of the entire fuel system at the selected point under the current engine operating condition does not meet the requirements for carbon canister cleaning. If the desorption flow rate of the entire fuel system is greater than or equal to the required flow rate for carbon canister cleaning, the desorption flow rate comparison result indicates that the desorption flow rate of the entire fuel system at the selected point under the current engine operating condition meets the requirements for carbon canister cleaning.

[0090] Step S33: Determine the desorption flow rate verification result based on the desorption flow rate comparison result.

[0091] Understandably, when the desorption flow rate of the entire fuel system is less than the required flow rate for carbon canister cleaning, it indicates that the desorption flow rate of the entire fuel system corresponding to the selected point under the current engine operating condition does not meet the requirements for carbon canister cleaning, i.e., the desorption flow rate verification result is insufficient. When the desorption flow rate of the entire fuel system is greater than or equal to the required flow rate for carbon canister cleaning, it indicates that the desorption flow rate of the entire fuel system corresponding to the selected point under the current engine operating condition meets the requirements for carbon canister cleaning, i.e., the desorption flow rate verification result is normal.

[0092] In one feasible implementation, step S33 may include steps A331 to A332:

[0093] Step A331: When the desorption flow comparison result shows that the target desorption flow is less than the required desorption flow, the desorption flow verification result is determined to be an insufficient desorption flow result.

[0094] Understandably, insufficient desorption flow rate means that the desorption flow rate of the entire fuel system does not meet the requirements for carbon canister cleaning.

[0095] In practice, when the desorption flow rate of the entire fuel system is less than the required flow rate for carbon canister cleaning, it indicates that the desorption flow rate of the entire fuel system corresponding to the selected point of the current engine operating condition does not meet the requirements for carbon canister cleaning, that is, the desorption flow rate verification result is insufficient desorption flow rate.

[0096] In one feasible implementation, step A331 may include steps B3311 to B3313:

[0097] Step B3311: When the desorption flow rate verification result is insufficient, adjust the current engine operating condition to obtain the updated engine operating condition.

[0098] It is understandable that updating engine operating conditions refers to adjusting the engine operating conditions after selecting engine operating condition points.

[0099] In practice, when the desorption flow verification result shows that the desorption flow of the entire fuel system corresponding to the selected point of the current engine operating condition does not meet the requirements of carbon canister cleaning, it indicates that the engine operating condition needs to be reselected to meet the requirements of carbon canister cleaning, and then the engine operating condition of the reselected engine operating condition is obtained, that is, the updated engine operating condition is obtained.

[0100] Step B3312: Determine the corresponding update desorption flow rate based on the updated engine operating conditions;

[0101] It is understandable that updating the desorption flow rate refers to updating the desorption flow rate of the entire fuel system corresponding to the engine operating conditions.

[0102] In practice, when determining the engine operating conditions after adjusting the engine operating condition selection points, the low and high desorption flow rates under the updated engine operating conditions are recalculated, thereby obtaining the desorption flow rate of the entire fuel system corresponding to the updated engine operating conditions.

[0103] Step B3313: Obtain the updated desorption flow verification result based on the updated desorption flow and the required desorption flow.

[0104] It is understandable that updating the desorption flow rate verification result refers to the comparison result of whether the desorption flow rate of the entire fuel system corresponding to the updated engine operating condition meets the carbon canister cleaning requirement.

[0105] In practice, the desorption flow rate of the entire fuel system corresponding to the updated engine operating condition is compared with the required flow rate for carbon canister cleaning. If the desorption flow rate of the entire fuel system corresponding to the updated engine operating condition is greater than or equal to the required flow rate for carbon canister cleaning, it indicates that the updated desorption flow rate meets the carbon canister cleaning requirements, and the updated engine operating condition is the final selected engine operating condition. If the desorption flow rate of the entire fuel system corresponding to the updated engine operating condition is less than the required flow rate for carbon canister cleaning, it indicates that the updated desorption flow rate does not meet the carbon canister cleaning requirements, and the engine operating condition selection needs to be repeated until the required flow rate for carbon canister cleaning is met.

[0106] Step A332: When the desorption flow comparison result is that the target desorption flow is greater than or equal to the required desorption flow, the desorption flow verification result is determined to be a normal desorption flow result.

[0107] It is understandable that a normal desorption flow rate means that the desorption flow rate of the entire fuel system meets the requirements for carbon canister cleaning.

[0108] In practice, when the desorption flow rate of the entire fuel system is greater than or equal to the required flow rate for carbon canister cleaning, the desorption flow rate comparison result is that the desorption flow rate of the entire fuel system corresponding to the selected point under the current engine operating condition meets the requirements for carbon canister cleaning.

[0109] This embodiment determines the target desorption flow rate based on the first desorption flow rate and the second desorption flow rate; compares the target desorption flow rate with the required desorption flow rate to obtain a desorption flow rate comparison result; and determines the desorption flow rate verification result based on the desorption flow rate comparison result. By comparing the high and low desorption flow rate values ​​under the vehicle's WLC operating condition with the required flow rate for carbon canister cleaning, it is possible to intuitively reflect whether the current solution can meet emission requirements and where improvements are needed, providing clearer guidance for determining the vehicle solution and selecting engine operating conditions.

[0110] For example, to help understand the implementation process of the desorption flow verification method obtained in this embodiment combined with the above embodiment one, please refer to... Figure 3 , Figure 3 A simplified flowchart of a desorption flow rate verification method is provided. Specifically, the flow resistance parameters of the fuel system's pipelines and valve bodies are collected, and then the pressure drop from the atmospheric inlet to the carbon canister solenoid valve inlet is determined. Simultaneously, the inherent characteristics (pressure-flow curves) of the carbon canister solenoid valve and venturi valve, among other selected components, are considered. The intake manifold pressure data P1 under WLTC conditions is confirmed by selecting points on the engine. Then, the flow characteristic curve of the carbon canister solenoid valve is correlated with this pressure P1 and the inlet pressure difference of the carbon canister solenoid valve. The flow rate under various pressure difference conditions is measured, and then integrated at each point under WLTC conditions to obtain the low desorption flow rate value for the entire vehicle under WLTC conditions. Simultaneously, simulation is needed to confirm the intercooler pressure P2 and the bleed air pressure P3, where P2 is the venturi valve inlet side pressure and P3 is the venturi valve outlet side pressure. Then, by comparing the flow-pressure curve of the Venturi valve and integrating the flow rates at each point, the high desorption flow rate under WLTC conditions can be calculated for the entire vehicle. The sum of the high and low desorption flows under WLTC conditions is the total desorption flow rate of the entire fuel system. Finally, by comparing this flow rate with the required flow rate for carbon canister cleaning, it can be directly determined whether the current solution meets emission requirements. If the required desorption amount is not met, the selection of the desorption point can be adjusted in a timely manner, which is of guiding significance for determining the overall vehicle solution and selecting engine operating conditions.

[0111] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the desorption flow verification method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0112] This application also provides a desorption flow rate verification device, please refer to... Figure 4 The desorption flow rate verification device includes:

[0113] Processing module 10 is used to determine the first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and the mapping relationship of the carbon canister solenoid valve. The first desorption flow rate is the desorption flow rate generated under the first load operation.

[0114] The processing module 10 is also used to determine the second desorption flow rate based on the Venturi pressure difference and the Venturi valve mapping relationship. The second desorption flow rate is the desorption flow rate generated under the second load operation, where the second load is greater than the first load.

[0115] The verification module 20 is used to determine the desorption flow verification result based on the first desorption flow and the second desorption flow.

[0116] Optionally, the processing module 10 is further configured to:

[0117] Desorption inlet pressure is determined based on atmospheric pressure and desorption resistance;

[0118] The desorption outlet pressure is determined based on the intake manifold mapping relationship between the current engine operating condition and the target test condition;

[0119] The pressure difference of the carbon canister solenoid valve is obtained based on the desorption inlet pressure and the desorption outlet pressure.

[0120] Optionally, the processing module 10 is further configured to:

[0121] Under various engine operating conditions, the target test conditions are simulated based on the manifold pressure-speed mapping relationship, resulting in multiple simulated desorption flow rates and the intake manifold mapping relationship of the target test conditions.

[0122] By comparing multiple simulated desorption flow rates, the current engine operating condition is determined.

[0123] Optionally, the processing module 10 is further configured to:

[0124] Multiple flow values ​​corresponding to the target test condition are determined based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve.

[0125] The first desorption flow rate is obtained by integrating multiple flow rates corresponding to the target test condition.

[0126] Optionally, the verification module 20 is further configured to:

[0127] Determine the target desorption flow rate based on the first desorption flow rate and the second desorption flow rate;

[0128] The target desorption flow rate is compared with the required desorption flow rate to obtain the desorption flow rate comparison result;

[0129] The desorption flow rate verification result is determined based on the desorption flow rate comparison results.

[0130] Optionally, the verification module 20 is further configured to:

[0131] When the desorption flow comparison result shows that the target desorption flow is less than the required desorption flow, the desorption flow verification result is determined to be an insufficient desorption flow result.

[0132] When the desorption flow comparison result shows that the target desorption flow is greater than or equal to the required desorption flow, the desorption flow verification result is determined to be a normal desorption flow result.

[0133] Optionally, the verification module 20 is further configured to:

[0134] When the desorption flow rate verification result is insufficient, the current engine operating condition is adjusted to obtain the updated engine operating condition.

[0135] Determine the corresponding update desorption flow rate based on the updated engine operating conditions;

[0136] The updated desorption flow verification result is obtained based on the updated desorption flow and the required desorption flow.

[0137] The desorption flow verification device provided in this application, employing the desorption flow verification method described in the above embodiments, can solve the technical problem of how to quickly and accurately assess whether the fuel system desorption flow meets the requirements in the early stages of vehicle development. Compared with the prior art, the beneficial effects of the desorption flow verification device provided in this application are the same as those of the desorption flow verification method provided in the above embodiments, and other technical features in the desorption flow verification device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0138] This application provides a desorption flow verification device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the desorption flow verification method in the above embodiment 1.

[0139] The following is for reference. Figure 5 The diagram illustrates a structural schematic suitable for implementing the deattachment flow verification device in the embodiments of this application. The deattachment flow verification device in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The desorption flow verification device shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0140] like Figure 5As shown, the desorption flow verification device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.) that can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the desorption flow verification device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 allows the de-attached flow verification device to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows de-attached flow verification devices with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0141] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0142] The desorption flow rate verification device provided in this application, employing the desorption flow rate verification method described in the above embodiments, can solve the technical problem of how to quickly and accurately assess whether the fuel system desorption flow rate meets the requirements in the early stages of vehicle development. Compared with the prior art, the beneficial effects of the desorption flow rate verification device provided in this application are the same as those of the desorption flow rate verification method provided in the above embodiments, and other technical features of this desorption flow rate verification device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0143] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0144] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0145] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the desorption flow verification method in the above embodiments.

[0146] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0147] The aforementioned computer-readable storage medium may be included in the desorption flow verification device; or it may exist independently and not be assembled into the desorption flow verification device.

[0148] The aforementioned computer-readable storage medium carries one or more programs. When the aforementioned one or more programs are executed by the desorption flow verification device, the desorption flow verification device: determines a first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve and the carbon canister solenoid valve, wherein the first desorption flow rate is the desorption flow rate generated under a first load operation; determines a second desorption flow rate based on the pressure difference of the venturi tube and the mapping relationship between the venturi valve and the venturi valve, wherein the second desorption flow rate is the desorption flow rate generated under a second load operation, wherein the second load is greater than the first load; and determines a desorption flow rate verification result based on the first desorption flow rate and the second desorption flow rate.

[0149] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0150] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0151] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0152] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described desorption flow verification method. This solves the technical problem of how to quickly and accurately assess whether the fuel system desorption flow meets requirements in the early stages of vehicle development. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the desorption flow verification method provided in the above embodiments, and will not be elaborated upon here.

[0153] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the desorption flow verification method described above.

[0154] The computer program product provided in this application can solve the technical problem of how to quickly and accurately assess whether the desorption flow rate of the fuel system meets the requirements in the early stages of vehicle development. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the desorption flow rate verification method provided in the above embodiments, and will not be repeated here.

[0155] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for verifying desorption flow rate, characterized in that, The desorption flow rate verification method includes: The first desorption flow rate is determined based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve. The first desorption flow rate is the desorption flow rate generated under the first load operation. The second desorption flow rate is determined based on the pressure difference of the venturi tube and the mapping relationship of the venturi valve. The second desorption flow rate is the desorption flow rate generated under the second load operation, which is greater than the first load. The desorption flow rate verification result is determined based on the first desorption flow rate and the second desorption flow rate; The step of determining the desorption flow rate verification result based on the first desorption flow rate and the second desorption flow rate includes: Determine the target desorption flow rate based on the first desorption flow rate and the second desorption flow rate; The target desorption flow rate is compared with the required desorption flow rate to obtain the desorption flow rate comparison result; The desorption flow rate verification result is determined based on the desorption flow rate comparison results.

2. The method as described in claim 1, characterized in that, Before determining the first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and the mapping relationship of the carbon canister solenoid valve, the method further includes: Desorption inlet pressure is determined based on atmospheric pressure and desorption resistance; The desorption outlet pressure is determined based on the intake manifold mapping relationship between the current engine operating condition and the target test condition; The pressure difference of the carbon canister solenoid valve is obtained based on the desorption inlet pressure and the desorption outlet pressure.

3. The method as described in claim 2, characterized in that, Before determining the desorption outlet pressure based on the intake manifold mapping relationship between the current engine operating condition and the target test condition, the following steps are also included: Under various engine operating conditions, the target test conditions are simulated based on the manifold pressure-speed mapping relationship, resulting in multiple simulated desorption flow rates and the intake manifold mapping relationship of the target test conditions. By comparing multiple simulated desorption flow rates, the current engine operating condition is determined.

4. The method as described in claim 1, characterized in that, The determination of the first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and the mapping relationship of the carbon canister solenoid valve includes: Multiple flow values ​​corresponding to the target test condition are determined based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve. The first desorption flow rate is obtained by integrating multiple flow rates corresponding to the target test condition.

5. The method as described in claim 1, characterized in that, The step of determining the desorption flow rate verification result based on the desorption flow rate comparison result includes: When the desorption flow comparison result shows that the target desorption flow is less than the required desorption flow, the desorption flow verification result is determined to be an insufficient desorption flow result. When the desorption flow comparison result shows that the target desorption flow is greater than or equal to the required desorption flow, the desorption flow verification result is determined to be a normal desorption flow result.

6. The method as described in claim 1, characterized in that, After determining that the desorption flow verification result is insufficient when the desorption flow comparison result is that the target desorption flow is less than the required desorption flow, the method further includes: When the desorption flow rate verification result is insufficient, the current engine operating condition is adjusted to obtain the updated engine operating condition. Determine the corresponding update desorption flow rate based on the updated engine operating conditions; The updated desorption flow verification result is obtained based on the updated desorption flow and the required desorption flow.

7. A desorption flow rate verification device, characterized in that, The device includes: The processing module is used to determine the first desorption flow rate based on the pressure difference of the carbon canister solenoid valve and the mapping relationship between the carbon canister solenoid valve and the carbon canister solenoid valve. The first desorption flow rate is the desorption flow rate generated under the first load operation. The processing module is also used to determine the second desorption flow rate based on the Venturi pressure difference and the Venturi valve mapping relationship. The second desorption flow rate is the desorption flow rate generated under the second load operation, where the second load is greater than the first load. The verification module is used to determine the desorption flow verification result based on the first desorption flow and the second desorption flow; The verification module is further configured to determine the target desorption flow rate based on the first desorption flow rate and the second desorption flow rate; The target desorption flow rate is compared with the required desorption flow rate to obtain the desorption flow rate comparison result; The desorption flow rate verification result is determined based on the desorption flow rate comparison results.

8. A desorption flow rate verification device, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the desorption flow verification method as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the desorption flow verification method as described in any one of claims 1 to 6.

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