Condensate drainage methods, devices, electronic equipment and storage media

Abstract

This invention discloses a method, apparatus, electronic device, and storage medium for condensate drainage, relating to computer technology. The method includes: after detecting the start of the exhaust gas recirculation (EGR) system's drainage program, acquiring the engine's intake air temperature; determining the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature; and determining the opening degree of the EGR valve based on the EGR rate and throttle demand pressure ratio to drain the condensate generated in the EGR system based on the EGR valve opening degree. This embodiment, by adjusting the EGR rate and throttle demand pressure ratio according to the intake air temperature, can promptly adjust the EGR valve opening at different temperatures. During driving, it ensures that the engine can controllably drain condensate into the mixer for combustion in the cylinders without misfire. This improves upon existing solutions that suffer from multiple-cylinder misfires and severe engine vibration due to large amounts of condensate entering the cylinders, thus enhancing driving safety.

Description

Technical Field

[0001] This invention relates to the field of computer technology, and in particular to a method, apparatus, electronic device, and storage medium for draining condensate. Background Technology

[0002] Harmful emissions from engines are one of the main sources of air pollution. The exhaust gas recirculation (EGR) system can reintroduce the exhaust gas from the engine into the intake manifold, mix it with fresh air in the mixer, and then enter the cylinder to participate in the combustion process again, thereby reducing the emission of nitrogen oxides from the engine.

[0003] In cold environments (such as northern winters), during engine warm-up, the EGR system's cooler and auxiliary pipes produce a large amount of condensation, which accumulates in the cooler pipes. Once driving begins and the EGR system activates when the required temperature is met, the process of blowing air into the cylinders will force a large amount of condensation from the pipes into the cylinders. This can cause multiple cylinders to misfire consecutively, resulting in severe engine vibration and affecting driving experience and safety. Summary of the Invention

[0004] This invention provides a method, apparatus, electronic device, and storage medium for condensate drainage, which can improve existing solutions for condensate drainage.

[0005] In a first aspect, the present invention provides a method for draining condensate, comprising:

[0006] After detecting that the exhaust gas recirculation (EGR) system has started the drainage procedure, the engine intake air temperature is obtained;

[0007] The EGR rate and throttle demand pressure ratio in the EGR system are determined based on the intake air temperature.

[0008] The opening degree of the EGR valve is determined based on the EGR rate and the throttle demand pressure ratio, so as to discharge the condensate generated in the EGR system based on the opening degree of the EGR valve.

[0009] Optionally, determining the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature includes:

[0010] When the intake air temperature is not greater than the first temperature value, the EGR rate is determined to be 0, and the throttle demand pressure ratio is the standard throttle demand pressure ratio.

[0011] When the intake air temperature is greater than the first temperature value and less than the second temperature value, the EGR rate is determined to be a first value; the throttle body pressure ratio is determined to be a second value.

[0012] When the intake air temperature is greater than the second temperature value, the EGR rate is determined to be the standard EGR rate, and the throttle demand pressure ratio is the standard throttle demand pressure ratio.

[0013] Optionally, determining the opening degree of the EGR valve based on the EGR rate and the throttle demand pressure ratio includes:

[0014] When the EGR rate is 0 and the throttle demand pressure ratio is the standard throttle demand pressure ratio, the opening degree of the EGR valve is determined to be 0.

[0015] When the EGR rate is a first value and the throttle valve pressure ratio is a second value, the opening degree of the EGR valve is less than a third value;

[0016] When the EGR rate is the standard EGR rate and the throttle demand pressure ratio is the standard throttle demand pressure ratio, the opening degree of the EGR valve is the standard opening degree.

[0017] Optionally, when the opening degree of the EGR valve is 0, the method further includes:

[0018] The engine external characteristics in the EGR system are controlled as the first external characteristic;

[0019] When the opening degree of the EGR valve is less than the third value, the method further includes:

[0020] The engine external characteristics in the EGR system are controlled as the second external characteristics;

[0021] When the EGR valve is at its standard opening, the method further includes:

[0022] The engine external characteristics in the EGR system are controlled to be standard external characteristics.

[0023] Optionally, the first value of the EGR rate is determined as follows:

[0024] Obtain the engine coolant temperature in the EGR system;

[0025] The first value is determined based on the engine coolant temperature, the intake air temperature, and the standard EGR rate;

[0026] The second value of the throttle valve pressure ratio is determined in the following manner:

[0027] Obtain the engine speed and engine load values ​​in the EGR system;

[0028] The pressure ratio offset value is determined based on the engine speed and the engine load value;

[0029] The second value is determined based on the pressure ratio offset value and the standard throttle required pressure ratio parameter.

[0030] Optionally, the second external characteristic of the engine external characteristics is obtained in the following manner:

[0031] The second external characteristic is obtained based on the first external characteristic and the standard external characteristic, wherein the first external characteristic is obtained based on the standard external characteristic when the EGR rate is 0.

[0032] Optionally, before detecting that the exhaust gas recirculation (EGR) system has started the drainage procedure, the following steps are also included:

[0033] Obtain engine coolant temperature and ambient temperature;

[0034] When the engine coolant temperature is higher than the third temperature value and the ambient temperature is higher than the fourth temperature value, the EGR system does not need to start the drainage procedure and controls the opening of the EGR valve to the standard opening.

[0035] In a second aspect, the present invention provides a condensate draining device, the device comprising:

[0036] The temperature acquisition module is used to acquire the engine's intake air temperature after the exhaust gas recirculation (EGR) system is detected to have started the drainage procedure.

[0037] The parameter determination module is used to determine the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature.

[0038] The opening degree determination module is used to determine the opening degree of the EGR valve based on the EGR rate and the throttle demand pressure ratio, so as to discharge the condensate generated in the EGR system based on the opening degree of the EGR valve.

[0039] Thirdly, the present invention also provides an electronic device, the electronic device comprising:

[0040] At least one processor; and

[0041] A memory communicatively connected to the at least one processor; wherein,

[0042] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the condensate drainage method according to any embodiment of the present invention.

[0043] Fourthly, the present invention also provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the condensate drainage method according to any embodiment of the present invention.

[0044] The condensate drainage solution provided by this invention, after detecting the start of the exhaust gas recirculation (EGR) system's drainage procedure, first acquires the engine's intake air temperature; then, it determines the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature; finally, it determines the opening degree of the EGR valve based on the EGR rate and throttle demand pressure ratio, thereby draining the condensate generated in the EGR system based on the EGR valve's opening degree. This embodiment, by adjusting the EGR rate and throttle demand pressure ratio according to the intake air temperature, can promptly adjust the opening degree of the EGR valve at different temperatures. During driving, it ensures that the engine can controllably drain condensate into the mixer for combustion in the cylinders without misfire. This improves upon existing solutions that suffer from multiple-cylinder misfires and severe engine vibration due to large amounts of condensate entering the cylinders, thus enhancing driving safety.

[0045] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0046] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic flowchart of the condensate drainage method provided by the present invention;

[0048] Figure 2 This is another schematic diagram of the condensate drainage method provided by the present invention;

[0049] Figure 3 This is a schematic diagram of the condensate drain device provided by the present invention;

[0050] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0051] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0052] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0053] Figure 1 This is a schematic flowchart of the condensate drainage method provided by the present invention. This embodiment is applicable to the effective drainage of condensate generated in an EGR system. The method can be executed by a condensate drainage device, which can be implemented in hardware and / or software and can be configured in computer equipment such as a server. (Reference) Figure 1 The method may specifically include the following steps:

[0054] S110. After detecting that the exhaust gas recirculation (EGR) system has started the drainage procedure, obtain the engine's intake air temperature.

[0055] When starting a vehicle in cold weather conditions (e.g., -20°C), as the engine coolant temperature gradually rises, a large amount of condensation will be generated in the EGR system due to the significant temperature difference between the ambient temperature and the engine coolant temperature. In this case, a drainage procedure needs to be initiated to remove the condensation. However, when the ambient temperature is not low (e.g., above 10°C), the temperature difference between the ambient temperature and the engine coolant temperature is small, and no condensation will be generated, so there is no need to initiate a drainage procedure.

[0056] The drainage program indicated in this embodiment is a newly added program in the software design. Trigger conditions can be set for the drainage program, such as starting the drainage program when the temperature difference between the ambient temperature and the engine water temperature exceeds a preset temperature, and then executing the condensate drainage scheme provided in this embodiment after the drainage program is started.

[0057] During engine startup, the intake manifold delivers exhaust gases from the engine to the mixer, where they are mixed with fresh air before being fed into the cylinders for combustion. At this time, the engine's current intake air temperature is acquired; this temperature corresponds to the temperature at which the exhaust gases and fresh air are mixed. Based on this intake air temperature, the required EGR rate and throttle pressure ratio for discharging condensate are determined.

[0058] S120. Determine the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature.

[0059] When determining the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature, a temperature-parameter mapping table can be pre-determined to determine the corresponding EGR rate and throttle demand pressure ratio based on the current temperature. Optionally, the EGR rate and throttle demand pressure ratio corresponding to the current intake air temperature can also be calculated in real time based on parameters such as engine speed, torque, and air pressure. The specific method for determining the EGR rate and throttle demand pressure ratio in the EGR system is not limited here.

[0060] The EGR rate mentioned above represents the ratio of the amount of recirculated exhaust gas to the total amount of intake air into the cylinder; the purpose of determining the EGR rate is for users to control the amount of exhaust gas discharged into the condensate.

[0061] The throttle body is a controllable valve that regulates the amount of air entering the engine. After entering the intake manifold, the air mixes with gasoline to form a combustible mixture, which then burns to produce power. The throttle demand pressure ratio indicates the ratio of the intake pressure after the throttle to the boost pressure before the throttle. The purpose of determining the throttle demand pressure ratio is to adapt to changes in the EGR rate. Based on the throttle demand pressure ratio at the current temperature, this helps to increase the EGR gas flow rate and remove water accumulated in the pipeline.

[0062] The aforementioned EGR rate can be set to 0, the standard EGR rate, or calculated in real time based on multiple parameters in the EGR system obtained during engine operation at the current temperature, depending on the intake air temperature. Correspondingly, the throttle demand pressure ratio can be set to the standard throttle demand pressure ratio or calculated in real time based on multiple parameters in the EGR system obtained during engine operation at the current temperature.

[0063] The aforementioned standard EGR rate and standard throttle demand pressure ratio indicate the values ​​corresponding to the conventionally set EGR rate and throttle demand pressure ratio when the engine is operating at normal temperature.

[0064] For example, when determining the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature, such as -30°C, in extremely low ambient temperatures, the EGR rate corresponding to the current temperature can be determined to be zero, and the throttle demand pressure ratio can be set to the standard throttle demand pressure ratio. This parameter setting method can prevent icing at the EGR valve or mixer position when the engine is running at extremely low temperatures. As the engine runs, the intake air temperature will gradually increase, such as to -10°C, and the EGR rate can be determined to be the first value. At the same time, the throttle demand pressure ratio can be reduced to increase the pressure difference across the EGR valve, increase the EGR gas flow rate, and allow condensate to be discharged slowly and in a controlled manner.

[0065] S130. Determine the opening degree of the EGR valve based on the EGR rate and throttle demand pressure ratio, and discharge the condensate generated in the EGR system based on the opening degree of the EGR valve.

[0066] The EGR valve is used to control the amount of gas sent to the cylinder for combustion. By setting the EGR rate and throttle demand pressure ratio in step S120, the opening of the EGR valve can be controlled so that the condensate in the EGR line can be slowly blown into the mixer and into the cylinder for combustion according to the corresponding opening size, ensuring that the engine does not misfire.

[0067] Taking step S120 as an example, when the EGR rate is 0, the corresponding EGR valve opening is 0, and the throttle valve demand pressure ratio is the standard value. At this time, to prevent icing from occurring at the EGR valve or mixer position, as the temperature rises, the EGR rate is gradually increased, and the throttle valve demand pressure ratio is decreased, which controlslably opens the EGR valve, causing the pressure difference across the EGR valve to increase, increasing the EGR gas flow rate, and allowing the condensate to be discharged slowly and in a controlled manner. Alternatively, as the temperature rises again, both the EGR rate and the throttle valve demand pressure ratio can be set to the standard value. At this time, the EGR valve opening is also at the normal opening, and the condensate discharge operation is performed, etc.

[0068] The condensate drainage method provided in this embodiment first acquires the engine's intake air temperature after detecting the start of the exhaust gas recirculation (EGR) system's drainage program. Then, it determines the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature. Finally, it determines the opening degree of the EGR valve based on the EGR rate and throttle demand pressure ratio, thereby draining the condensate generated in the EGR system based on the EGR valve's opening degree. This embodiment, by adjusting the EGR rate and throttle demand pressure ratio according to the intake air temperature, can promptly adjust the EGR valve opening at different temperatures. During driving, it ensures that the engine can controllably drain condensate into the mixer for combustion in the cylinders without misfire. This improves upon existing solutions that suffer from multiple-cylinder misfires and severe engine vibration due to large amounts of condensate entering the cylinders, thus enhancing driving safety.

[0069] Figure 2 This is another schematic flowchart of the condensate drainage method provided by the present invention. The relationship between this embodiment and the above embodiments further refines the corresponding features of the above embodiments. Figure 2 As shown, the method may include the following steps:

[0070] S210: Obtain engine coolant temperature and ambient temperature.

[0071] Engine coolant temperature and ambient temperature are used to determine whether the EGR system needs to initiate a drainage procedure.

[0072] S220. Determine whether the engine coolant temperature is higher than the third temperature value and whether the ambient temperature is higher than the fourth temperature value.

[0073] If the temperature is higher than normal, then there is no need to start the drainage procedure; proceed to step S280. Under these conditions, no condensate will be generated in the EGR system. If the temperature is not higher than normal, then proceed to step S230.

[0074] The third temperature value can be 30℃, 40℃, or 60℃; the third temperature value can also be any value within a preset range, such as [30℃, 60℃]; the fourth temperature value is the ambient temperature of the current vehicle, for example, it can be -40℃, -20℃, or 10℃, etc.; the fourth temperature value can also be any value within a preset range, such as [-40℃, 10℃]; the specific selection of the third and fourth temperature values ​​is not limited here, and the experimental data shall prevail.

[0075] S230: After detecting that the exhaust gas recirculation (EGR) system has started the drainage procedure, obtain the engine's intake air temperature.

[0076] S240. Determine if the intake air temperature is greater than the first temperature value.

[0077] In the current step, the EGR rate and throttle demand pressure ratio are determined based on whether the engine intake air temperature is greater than a first temperature value, in order to further determine the opening degree of the EGR valve required to discharge the condensate in the current EGR system.

[0078] If the temperature is not greater than the first temperature value, i.e., no, then proceed to steps S250 to S251.

[0079] If the temperature is greater than the first temperature value, then proceed to step S260.

[0080] The first temperature value can be -20℃, -15℃ or -10℃, and the value of the first temperature value can also be any value within a preset range, such as [-20℃, -10℃]. The specific selection of the first temperature value is not limited here and is based on experimental data.

[0081] S250, EGR rate is set to 0, throttle demand pressure ratio is set to standard throttle demand pressure ratio.

[0082] When the intake air temperature is lower than the first temperature value, it indicates that the intake air temperature is too low in a cold environment. At this time, the EGR rate can be set to 0 and the throttle demand pressure ratio can be set to the standard throttle demand pressure ratio to prevent ice formation at the EGR valve or mixer.

[0083] S251. Determine the opening degree of the EGR valve to be 0, and control the engine external characteristics in the EGR system to the first external characteristic.

[0084] Under the current conditions, the opening degree of the EGR valve is set to 0, meaning that no condensate is discharged. The purpose of setting the EGR rate to 0 and the throttle demand pressure ratio to the standard throttle demand pressure ratio is to reduce the generation of condensate and prevent icing at the EGR valve or mixer.

[0085] Since the engine operates without EGR when the external EGR rate is 0, it is necessary to limit the engine's external characteristics to protect engine safety. The technical solution provided in this embodiment controls the engine's external characteristics in the EGR system as a first external characteristic. This first external characteristic is defined as the maximum permissible external characteristic under the condition of an EGR rate of 0, so that the engine's knock intensity and exhaust temperature are controlled within safe limits. This protects the engine by preventing icing at the EGR valve or mixer.

[0086] The aforementioned first external characteristic is a characteristic curve obtained from test data when the EGR rate is 0 and the throttle demand pressure ratio is the standard throttle demand pressure ratio, based on the standard external characteristic of the engine. This curve is used to protect the engine when the intake air temperature is lower than the first temperature value.

[0087] S260, Determine if the intake air temperature is lower than the second temperature value.

[0088] As the engine heats up, the intake air temperature slowly increases, and the corresponding EGR rate and throttle demand pressure ratio settings will also change with the change in intake air temperature.

[0089] If it is less than the second temperature value, then proceed with steps S270 to S271.

[0090] If the temperature is not less than the second temperature value, i.e., no, then proceed to steps S280 to S281.

[0091] The second temperature value can be -5℃, 0℃ or 5℃, and the value of the second temperature value can also be any value within a preset range, such as [-5℃, 5℃]. The specific selection of the second temperature value is not limited here and is based on experimental data.

[0092] S270, the EGR rate is determined as the first value; the throttle demand pressure ratio is determined as the second value.

[0093] In this scenario, as the initial temperature gradually increases, condensate is generated in the EGR system. When draining the condensate, the EGR rate needs to be determined as the first value; the throttle pressure ratio needs to be determined as the second value. The first and second values ​​can be obtained in advance based on experimental data, or they can be calculated in real-time based on the actual operating conditions of the engine.

[0094] In one implementation, the condensate drainage scheme provided in this embodiment determines the EGR rate as a first value in the following way:

[0095] Obtain the engine coolant temperature in the EGR system; determine a first value based on the engine coolant temperature, intake air temperature, and standard EGR rate.

[0096] The first value is obtained based on the standard EGR rate. This is achieved by determining the correction factor corresponding to the current engine coolant temperature and intake air temperature using the engine coolant temperature-intake air temperature self-check table. The first value is then obtained by multiplying the correction factor by the standard EGR rate. The correction factor is less than 1.

[0097] In one implementation, the condensate drainage scheme provided in this embodiment determines the second value of the throttle valve demand pressure ratio in the following manner:

[0098] Obtain the engine speed and engine load values ​​from the EGR system; determine the pressure ratio offset value based on the engine speed and engine load values; determine the second value based on the pressure ratio offset value and the standard throttle required pressure ratio parameter.

[0099] Under current conditions, to control and reduce the throttle demand pressure ratio and increase the pressure difference across the EGR valve, the reduction of the throttle demand pressure ratio needs to be based on the standard throttle demand pressure ratio. Specifically, this can be achieved by determining the pressure ratio offset value using an engine speed-engine load value self-check table, and then determining the second value based on the difference between the standard demand throttle pressure ratio and the offset value. By setting the throttle demand pressure ratio to this second value, the boost pressure and turbine inlet pressure during the drainage stage are controlled, thereby increasing the pressure difference across the EGR valve, increasing the EGR gas flow rate, and enhancing the drainage drive capability.

[0100] This embodiment, by determining the first and second numerical values, achieves the following: the smaller the throttle valve pressure ratio, the greater the calculated required boost pressure under the same load (intake pressure), and the less the booster vent valve is closed, thus increasing the boost pressure and turbine inlet pressure. This results in a larger pressure difference between the downstream (intake pressure) and upstream (turbine inlet pressure) of the EGR valve, which helps increase the EGR gas flow rate and remove accumulated water from the pipeline. When calibrating the pressure ratio offset value, it should be ensured that the maximum boost pressure does not exceed the allowable boundary; optionally, the pressure ratio offset value can be taken in the range [0, 0.8].

[0101] S271, the opening degree of the EGR valve is less than the third value, and the engine external characteristics controlled in the EGR system are the second external characteristics.

[0102] The current first value indicates that the EGR valve is allowed to open when the intake air temperature is greater than a first temperature value but less than a second temperature value. However, the current opening degree is small and should be less than a third value. For example, the current third value can be 5%, and the specific selection of the third value should be based on experimental data. By ensuring that the opening degree of the EGR valve is less than the third value, the condensate in the EGR system is controlled to slowly enter the cylinder, preventing a sudden opening of the EGR system and the resulting large amount of condensate being drawn into the cylinder, which could cause misfire.

[0103] Another implementation scheme obtains the second external characteristic of the engine external characteristics in the following way:

[0104] The second external characteristic is obtained based on the first external characteristic and the standard external characteristic. The first external characteristic is obtained based on the standard external characteristic when the EGR rate is 0.

[0105] Because the EGR valve has a certain opening degree during the drainage phase, and the safety boundary is also increased accordingly, under current conditions, the engine external characteristic is controlled as a second external characteristic to protect the engine. The second external characteristic of the engine can be calculated by interpolation based on engine external characteristic limit 1 and the standard external characteristic. The interpolation coefficient is a correction coefficient used when determining the EGR rate as the first value. The specific second external characteristic can be obtained as follows:

[0106] Second external characteristic = First external characteristic + Correction factor * (Standard external characteristic - First external characteristic)

[0107] S280. Determine the EGR rate as the standard EGR rate and the throttle demand pressure ratio as the standard throttle demand pressure ratio.

[0108] When the intake air temperature is higher than the second temperature value, it can be determined that the condensate generated in the EGR system has been completely drained. Furthermore, when the engine coolant temperature is higher than the third temperature value and the ambient temperature is higher than the fourth temperature value, no condensate will be generated in the EGR system. In both of these situations, the EGR system can be controlled to operate under standard conditions, and all control parameters return to normal, thus determining the EGR rate as the standard EGR rate and the throttle demand pressure ratio as the standard throttle demand pressure ratio.

[0109] S281, the opening degree of the EGR valve is the standard opening degree, and the engine external characteristics controlled in the EGR system are the standard external characteristics.

[0110] The condensate drainage method provided in this embodiment classifies the EGR system drainage method into multiple scenarios based on the intake air temperature and engine coolant temperature to ensure normal EGR operation under different environments and operating conditions, preventing the EGR valve and mixer from freezing. Furthermore, by determining the EGR rate based on the intake air temperature as a primary value, condensate from the EGR system slowly enters the cylinder, preventing sudden EGR activation and the resulting large amount of condensate being drawn into the cylinder, which could cause misfire. By setting the throttle valve demand pressure ratio to a secondary value, the boost pressure and turbine inlet pressure during the drainage phase are controlled, thereby increasing the pressure difference across the EGR valve, increasing the EGR gas flow rate, and enhancing the drainage driving capability.

[0111] Figure 3 This is a schematic diagram of a condensate drainage device provided by the present invention. This device is suitable for performing the condensate drainage method provided in this embodiment. Figure 3 As shown, the device may specifically include: a temperature acquisition module 310, a parameter determination module 320, and an opening degree determination module 330, wherein:

[0112] Temperature acquisition module 310 is used to acquire the engine intake air temperature after detecting that the exhaust gas recirculation (EGR) system has started the drainage program.

[0113] The parameter determination module 320 is used to determine the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature.

[0114] The opening degree determination module 330 is used to determine the opening degree of the EGR valve based on the EGR rate and the throttle demand pressure ratio, so as to discharge the condensate generated in the EGR system based on the opening degree of the EGR valve.

[0115] The condensate draining device provided in this embodiment first acquires the engine's intake air temperature after detecting the start of the exhaust gas recirculation (EGR) system's draining procedure. Then, it determines the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature. Finally, it determines the opening degree of the EGR valve based on the EGR rate and throttle demand pressure ratio, thereby draining the condensate generated in the EGR system based on the EGR valve's opening degree. This embodiment, by adjusting the EGR rate and throttle demand pressure ratio according to the intake air temperature, can promptly adjust the EGR valve opening at different temperatures. During driving, it ensures that the engine can controllably drain condensate into the mixer for combustion in the cylinders without misfire. This improves upon existing solutions that suffer from multiple-cylinder misfires and severe vibrations due to large amounts of condensate entering the cylinders, thus enhancing driving safety.

[0116] In one embodiment, the parameter determination module 320 is specifically configured to: determine the EGR rate as 0 and the throttle demand pressure ratio as a standard throttle demand pressure ratio when the intake air temperature is not greater than a first temperature value; determine the EGR rate as a first value and the throttle demand pressure ratio as a second value when the intake air temperature is greater than the first temperature value and less than a second temperature value; and determine the EGR rate as a standard EGR rate and the throttle demand pressure ratio as a standard throttle demand pressure ratio when the intake air temperature is greater than the second temperature value.

[0117] In one embodiment, the opening degree determination module 330 is specifically used to determine that the opening degree of the EGR valve is 0 when the EGR rate is 0 and the throttle demand pressure ratio is a standard throttle demand pressure ratio; when the EGR rate is a first value and the throttle demand pressure ratio is a second value, the opening degree of the EGR valve is less than a third value; and when the EGR rate is a standard EGR rate and the throttle demand pressure ratio is a standard throttle demand pressure ratio, the opening degree of the EGR valve is a standard opening degree.

[0118] In one embodiment, the device further includes: a characteristic control module; wherein:

[0119] The characteristic control module is specifically used to control the engine external characteristic in the EGR system to be a first external characteristic when the opening degree of the EGR valve is 0; to control the engine external characteristic in the EGR system to be a second external characteristic when the opening degree of the EGR valve is less than a third value; and to control the engine external characteristic in the EGR system to be a standard external characteristic when the opening degree of the EGR valve is a standard opening degree.

[0120] In one embodiment, the parameter determination module 320 includes: an acquisition unit and a determination unit, wherein:

[0121] The acquisition unit is used to acquire the engine coolant temperature in the EGR system;

[0122] A determining unit is configured to determine the first value based on the engine coolant temperature, the intake air temperature, and the standard EGR rate;

[0123] The acquisition unit is also used to acquire the engine speed and engine load values ​​in the EGR system;

[0124] The determining unit is further configured to determine the pressure ratio offset value based on the engine speed and the engine load value; and to determine the second value based on the pressure ratio offset value and the standard throttle required pressure ratio parameter.

[0125] In one embodiment, the second external characteristic of the engine external characteristics is obtained in the following manner:

[0126] The second external characteristic is obtained based on the first external characteristic and the standard external characteristic, wherein the first external characteristic is obtained based on the standard external characteristic when the EGR rate is 0.

[0127] In one embodiment, the temperature acquisition module 310 is also used to acquire the engine coolant temperature and the ambient temperature;

[0128] The opening degree determination module is also used to control the opening degree of the EGR valve to the standard opening degree when the engine coolant temperature is higher than the third temperature value and the ambient temperature is higher than the fourth temperature value, without the EGR system needing to start the drainage procedure.

[0129] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is merely an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the functional modules described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0130] The present invention also provides an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the condensate drainage method according to any embodiment of the present invention.

[0131] The present invention also provides a computer-readable medium storing computer instructions that, when executed by a processor, implement the condensate drainage method according to any embodiment of the present invention.

[0132] The following is for reference. Figure 4 It shows a schematic diagram of the structure of a computer system 500 suitable for implementing the electronic device of the present invention. Figure 4 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of this embodiment.

[0133] like Figure 4As shown, the computer system 500 includes a central processing unit (CPU) 501, which can perform various appropriate actions and processes based on programs stored in read-only memory (ROM) 502 or programs loaded from storage section 508 into random access memory (RAM) 503. The RAM 503 also stores various programs and data required for the operation of the system 500. The CPU 501, ROM 502, and RAM 503 are interconnected via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0134] The following components are connected to I / O interface 505: an input section 506 including a keyboard, mouse, etc.; an output section 507 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN card, modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to I / O interface 505 as needed. A removable medium 511, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 510 as needed so that computer programs read from it can be installed into storage section 508 as needed.

[0135] In particular, according to the embodiments disclosed in this invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this invention 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 communication section 509, and / or installed from removable medium 511. When the computer program is executed by central processing unit (CPU) 501, it performs the functions defined above in the system of this invention.

[0136] It should be noted that the computer-readable medium shown in this invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, 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 device, magnetic storage device, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0137] 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 the present invention. 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 a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may 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.

[0138] The modules and / or units described in this embodiment can be implemented in software or hardware. The described modules and / or units can also be housed in a processor; for example, a processor may include a temperature acquisition module, a parameter determination module, and an opening degree determination module. The names of these modules do not necessarily limit the functionality of the module itself.

[0139] In another aspect, the present invention also provides a computer-readable medium, which may be included in the device described in the above embodiments; or it may exist independently and not assembled into the device. The computer-readable medium carries one or more programs that, when executed by the device, cause the device to: acquire the engine intake air temperature after detecting that the exhaust gas recirculation (EGR) system has started a drainage procedure; determine the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature; and determine the opening degree of the EGR valve based on the EGR rate and the throttle demand pressure ratio to drain condensate generated in the EGR system based on the opening degree of the EGR valve.

[0140] According to the technical solution of this embodiment, by adjusting the EGR rate and throttle demand pressure ratio based on intake air temperature, the opening of the EGR valve can be adjusted accordingly at different temperatures. During driving, this ensures that the engine can controllably discharge condensate into the mixer for combustion in the cylinders without misfire. This improves upon the problems of multi-cylinder misfires and severe vibrations caused by large amounts of condensate entering the cylinders in existing solutions, thus enhancing driving safety.

[0141] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for draining condensate, characterized in that, include: After detecting that the exhaust gas recirculation (EGR) system has started the drainage procedure, the engine intake air temperature is obtained; The EGR rate and throttle demand pressure ratio in the EGR system are determined based on the intake air temperature. The opening degree of the EGR valve is determined based on the EGR rate and the throttle demand pressure ratio, so as to discharge the condensate generated in the EGR system based on the opening degree of the EGR valve; The determination of the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature includes: When the intake air temperature is not greater than the first temperature value, the EGR rate is determined to be 0, and the throttle demand pressure ratio is the standard throttle demand pressure ratio. When the intake air temperature is greater than the first temperature value and less than the second temperature value, the EGR rate is determined to be a first value; the throttle body pressure ratio is determined to be a second value. When the intake air temperature is greater than the second temperature value, the EGR rate is determined to be the standard EGR rate, and the throttle demand pressure ratio is the standard throttle demand pressure ratio. The step of determining the opening degree of the EGR valve based on the EGR rate and the throttle demand pressure ratio includes: When the EGR rate is 0 and the throttle demand pressure ratio is the standard throttle demand pressure ratio, the opening degree of the EGR valve is determined to be 0. When the EGR rate is a first value and the throttle valve pressure ratio is a second value, the opening degree of the EGR valve is less than a third value; When the EGR rate is the standard EGR rate and the throttle demand pressure ratio is the standard throttle demand pressure ratio, the opening degree of the EGR valve is the standard opening degree.

2. The condensate drainage method according to claim 1, characterized in that, When the opening degree of the EGR valve is 0, the method further includes: The engine external characteristics in the EGR system are controlled as the first external characteristic; When the opening degree of the EGR valve is less than the third value, the method further includes: The engine external characteristics in the EGR system are controlled as the second external characteristics; When the EGR valve is at its standard opening, the method further includes: The engine external characteristics in the EGR system are controlled to be standard external characteristics.

3. The condensate drainage method according to claim 1, characterized in that, The first value of the EGR rate is determined in the following manner: Obtain the engine coolant temperature in the EGR system; The first value is determined based on the engine coolant temperature, the intake air temperature, and the standard EGR rate; The second value of the throttle valve pressure ratio is determined in the following manner: Obtain the engine speed and engine load values ​​in the EGR system; The pressure ratio offset value is determined based on the engine speed and the engine load value; The second value is determined based on the pressure ratio offset value and the standard throttle required pressure ratio parameter.

4. The condensate drainage method according to claim 2, characterized in that, The second external characteristic of the engine external characteristics is obtained in the following manner: The second external characteristic is obtained based on the first external characteristic and the standard external characteristic, wherein the first external characteristic is obtained based on the standard external characteristic when the EGR rate is 0.

5. The condensate drainage method according to claim 1, characterized in that, Before the exhaust gas recirculation (EGR) system is detected to have started the drainage procedure, the following is also included: Obtain engine coolant temperature and ambient temperature; When the engine coolant temperature is higher than the third temperature value and the ambient temperature is higher than the fourth temperature value, the EGR system does not need to start the drainage procedure and controls the opening of the EGR valve to the standard opening.

6. A condensate draining device, characterized in that, include: The temperature acquisition module is used to acquire the engine's intake air temperature after the exhaust gas recirculation (EGR) system is detected to have started the drainage procedure. The parameter determination module is used to determine the EGR rate and throttle demand pressure ratio in the EGR system based on the intake air temperature. The opening degree determination module is used to determine the opening degree of the EGR valve based on the EGR rate and the throttle demand pressure ratio, so as to discharge the condensate generated in the EGR system based on the opening degree of the EGR valve. The parameter determination module is specifically used to determine the EGR rate as 0 and the throttle demand pressure ratio as a standard throttle demand pressure ratio when the intake air temperature is not greater than a first temperature value; to determine the EGR rate as a first value and the throttle demand pressure ratio as a second value when the intake air temperature is greater than the first temperature value and less than a second temperature value; and to determine the EGR rate as a standard EGR rate and the throttle demand pressure ratio as a standard throttle demand pressure ratio when the intake air temperature is greater than the second temperature value. The opening degree determination module is specifically used to determine that the opening degree of the EGR valve is 0 when the EGR rate is 0 and the throttle demand pressure ratio is a standard throttle demand pressure ratio; when the EGR rate is a first value and the throttle demand pressure ratio is a second value, the opening degree of the EGR valve is less than a third value; and when the EGR rate is a standard EGR rate and the throttle demand pressure ratio is a standard throttle demand pressure ratio, the opening degree of the EGR valve is a standard opening degree.

7. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor to enable the at least one processor to perform the condensate drainage method according to any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the condensate drainage method as described in any one of claims 1-5.

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