A cooling control method, device, equipment and medium of an EGR system

Abstract

The present invention provides a cooling control method, device, equipment and medium for an EGR system, the method comprising: when the EGR system of a vehicle is in operation, obtaining the operating parameters of the EGR system; wherein the operating parameters include the current intake air temperature, the current intake air flow rate and the current inlet water temperature of the EGR cooler; based on the preset corresponding relationship between the intake air flow rate, the inlet water temperature and the inlet water flow rate, determining the target inlet water flow rate corresponding to the current intake air flow rate and the current inlet water temperature; correcting the target inlet water flow rate according to the current intake air temperature to obtain the corrected target inlet water flow rate; and controlling the flow rate of a cooling water flow control member according to the corrected target inlet water flow rate to adjust the cooling water flow rate entering the EGR cooler. The present invention can adjust the cooling water flow rate flowing into the EGR cooler according to the cooling demand of the EGR gas.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a cooling control method, device, equipment and medium of an EGR system. Background Art

[0002] With the tightening of fuel consumption and emission regulations, EGR (Exhaust Gas Re-circulation) systems that allow exhaust gas to flow back to the engine are widely used in vehicles equipped with gasoline engines. When the engine is under high load, the temperature of the exhaust gas is generally high. If it is allowed to flow back to the engine's intake system at the original temperature, the combustion temperature will rise. Therefore, the refluxed EGR gas is generally cooled. However, the inventors found in the process of implementing the present invention that the flow rate of cooling water flowing into the EGR cooler is fixed, but the cooling demand of the EGR gas will change with different engine operating conditions. Therefore, the existing EGR cooling method cannot match the cooling demand of the EGR gas well. If the cooling water flow rate is too large, it will cause a waste of cooling water. If the cooling water flow rate is too small, it will cause the EGR gas temperature to be too high, which is not conducive to improving the engine's filling coefficient, nor is it conducive to reducing the engine's maximum temperature and knock. Summary of the invention

[0003] The present invention provides a cooling control method, device, equipment and medium of an EGR system, which can adjust the cooling water flow rate flowing into an EGR cooler according to the cooling demand of the EGR gas, thereby facilitating improving the filling coefficient of the engine, reducing the maximum temperature and knock of the engine, and improving the utilization rate of the cooling water.

[0004] To achieve the above object, an embodiment of the present invention provides a cooling control method for an EGR system, comprising the following steps:

[0005] When the EGR system of the vehicle is in operation, obtaining operation parameters of the EGR system; wherein the operation parameters include a current intake air temperature, a current intake air flow rate, and a current intake water temperature of the EGR cooler;

[0006] Determining a target water inlet flow rate corresponding to the current air inlet flow rate and the current water inlet temperature based on a preset corresponding relationship between the air inlet flow rate, the water inlet temperature and the water inlet flow rate;

[0007] Correcting the target water inlet flow rate according to the current intake air temperature to obtain a corrected target water inlet flow rate;

[0008] The cooling water flow control element is used to control the flow rate according to the corrected target water inlet flow rate, so as to adjust the cooling water flow rate entering the EGR cooler.

[0009] As an improvement of the above solution, the operating parameter also includes a pressure difference before and after the exhaust gas recirculation valve;

[0010] The current intake air flow rate is calculated based on the current intake air temperature and the pressure difference before and after the exhaust gas recirculation valve.

[0011] As an improvement of the above solution, the target water inlet flow rate is corrected according to the current intake air temperature to obtain a corrected target water inlet flow rate, including:

[0012] When it is determined that the current intake air temperature is greater than or equal to a first preset temperature, the target water intake flow rate is corrected to a preset flow rate to obtain a corrected target water intake flow rate;

[0013] When it is determined that the current intake air temperature is less than the first preset temperature, determining a target flow correction coefficient corresponding to the current intake air temperature based on a corresponding relationship between the EGR gas temperature and the flow correction coefficient;

[0014] The target water inlet flow rate is multiplied by the target flow rate correction coefficient to obtain a corrected target water inlet flow rate, and when it is determined that the corrected target water inlet flow rate is greater than the preset flow rate, the value of the corrected target water inlet flow rate is modified to the preset flow rate.

[0015] As an improvement of the above solution, when it is determined that the current intake air temperature is greater than or equal to the first preset temperature, the method further includes:

[0016] The EGR system is controlled to switch to a closed state until it is detected that the EGR gas temperature at the air inlet of the EGR cooler drops to a second preset temperature, and the EGR system is controlled to switch to a running state; wherein the second preset temperature is lower than the first preset temperature.

[0017] As an improvement of the above-mentioned scheme, the cooling water flow control component is connected to the EGR cooler to form a cooling branch; wherein, the liquid inlet of the cooling water flow control component is connected to the liquid outlet of the vehicle's electric drive system heat dissipation device, the liquid outlet of the cooling water flow control component is connected to the liquid inlet of the EGR cooler, and the liquid outlet of the EGR cooler is connected to the liquid inlet of the electric drive system heat dissipation device.

[0018] As an improvement of the above solution, the cooling water flow control element is controlled according to the corrected target water inlet flow to adjust the cooling water flow entering the EGR cooler, including:

[0019] Acquiring a heat dissipation demand flow of an intelligent power switch of the vehicle; wherein the intelligent power switch is cooled by the cooling branch;

[0020] Comparing the corrected target water inlet flow rate with the heat dissipation demand flow rate of the intelligent power switch to determine the larger value of the two;

[0021] The cooling water flow control element performs flow control according to the larger value to adjust the cooling water flow entering the EGR cooler.

[0022] As an improvement of the above solution, when the EGR system of the vehicle is in an operating state, before obtaining the operating parameters of the EGR system, the method further includes:

[0023] After the vehicle is powered on, a fault detection is performed on a target sensor in the EGR system to obtain a detection result; wherein the target sensor includes a first sensor for detecting engine water temperature, a second sensor for detecting the current intake air temperature, a third sensor for detecting the current intake water temperature, and a fourth sensor for detecting the vehicle ambient temperature;

[0024] When the detection result shows that none of the target sensors are in a fault state, the target sensors are controlled to collect temperature, and when it is determined that the EGR system start-up conditions are met according to the temperature collection result, the EGR system is controlled to switch to an operating state.

[0025] Another embodiment of the present invention provides a cooling control device for an EGR system, including:

[0026] A parameter acquisition module, used for acquiring operating parameters of the EGR system when the EGR system of the vehicle is in operation; wherein the operating parameters include a current intake air temperature, a current intake air flow rate and a current intake water temperature of the EGR cooler;

[0027] A flow acquisition module, configured to determine a target water inlet flow corresponding to the current air inlet flow and the current water inlet temperature based on a preset correspondence between the air inlet flow, the water inlet temperature and the water inlet flow;

[0028] A flow correction module, used for correcting the target water inlet flow according to the current intake air temperature to obtain a corrected target water inlet flow;

[0029] The cooling control module is used to control the cooling water flow control element according to the corrected target water inlet flow, so as to adjust the cooling water flow entering the EGR cooler.

[0030] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the cooling control method of the EGR system described in the above-mentioned embodiment of the invention is implemented.

[0031] Another embodiment of the present invention provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the cooling control method of the EGR system described in the above-mentioned embodiment of the invention.

[0032] Compared with the prior art, the cooling control method, device, equipment and medium of the EGR system provided in the embodiment of the present invention can adjust the cooling water flow rate flowing into the EGR cooler according to the cooling demand of the EGR gas, thereby solving the problem that the existing EGR cooling method cannot well match the cooling demand of the EGR gas, thereby improving the utilization rate of the cooling water, and can further optimize the outlet temperature of the EGR cooler, which is beneficial to improving the filling coefficient of the engine, reducing the maximum temperature and knock of the engine, and achieving fuel saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a flow chart of a cooling control method of an EGR system provided by an embodiment of the present invention;

[0034] Figure 2 It is a structural schematic diagram of an EGR system provided by an embodiment of the present invention;

[0035] Figure 3 It is a structural schematic diagram of a cooling control device for an EGR system provided by an embodiment of the present invention;

[0036] Figure 4 It is a structural diagram of a terminal device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] See also Figure 1 , is a flow chart of a cooling control method of an EGR system provided by an embodiment of the present invention, the method comprising steps S11 to S14:

[0041] S11. When the EGR system of the vehicle is in operation, obtain operation parameters of the EGR system; wherein the operation parameters include a current intake air temperature, a current intake air flow rate, and a current intake water temperature of the EGR cooler.

[0042] It should be noted that the current intake air temperature refers to the temperature of the EGR gas currently entering the EGR cooler; the current intake air flow rate refers to the flow rate of the EGR gas currently entering the EGR cooler; and the current inlet water temperature refers to the temperature of the cooling water currently entering the EGR cooler.

[0043] S12. Determine a target water inlet flow rate corresponding to the current air inlet flow rate and the current water inlet temperature based on a preset corresponding relationship among the air inlet flow rate, the water inlet temperature and the water inlet flow rate.

[0044] It can be understood that the target water intake flow rate required for cooling the EGR gas at the current flow rate can be determined according to the current intake air flow rate and the current intake water temperature.

[0045] Exemplarily, in step S12, the preset corresponding relationship between the intake air flow rate, the intake water temperature and the intake water flow rate is shown in Table 1 below.

[0046] Table 1

[0047]

[0048] It should be noted that Table 1 only shows the case where the values ​​of the inlet water temperature and the inlet water flow are integers. When the values ​​of the inlet water temperature and the cooling water flow are decimals, they can be inferred and calculated according to the mathematical logical relationship in Table 1. For example, the value between the two integers can be calculated by the difference.

[0049] S13. Correct the target water inlet flow rate according to the current intake air temperature to obtain a corrected target water inlet flow rate.

[0050] It can be understood that by correcting the target water intake flow rate according to the current intake air temperature, the target water intake flow rate required for cooling the EGR gas at the current flow rate and temperature under the current engine operating condition can be determined.

[0051] S14. According to the corrected target water inlet flow rate, the cooling water flow control element is controlled to adjust the cooling water flow rate entering the EGR cooler.

[0052] It can be understood that the cooling water flow control element is arranged in front of the liquid inlet of the EGR cooler, so that the cooling water flow control element can be used to control the flow rate, thereby adjusting the cooling water flow entering the EGR cooler.

[0053] It is worth mentioning that a cooling control method for an EGR system provided in an embodiment of the present invention can adjust the cooling water flow rate flowing into the EGR cooler according to the cooling demand of the EGR gas, thereby solving the problem that the existing EGR cooling method cannot well match the cooling demand of the EGR gas, thereby improving the utilization rate of the cooling water, and can further optimize the outlet temperature of the EGR cooler, which is beneficial to improving the filling coefficient of the engine, reducing the maximum temperature and knock of the engine, and achieving fuel saving and emission reduction.

[0054] For example, see Figure 2 , is a structural schematic diagram of an EGR system provided in this embodiment, wherein the EGR system at least includes an engine cooling system, a cooling water flow control element 22, an intelligent power switch 23, an EGR cooler 24, and an exhaust gas recirculation valve 25. In addition, a second sensor S2 for detecting the current intake air temperature T2 is provided at the air inlet of the EGR cooler 24, and a third sensor S3 for detecting the current intake water temperature T3 is provided at the liquid inlet of the EGR cooler 24.

[0055] It is worth noting that by setting a temperature sensor at a specified position in the EGR system, the temperature of the cooling water and EGR gas of the EGR system can be detected in real time through the sensor, so as to monitor and control the cooling water flow of the EGR system in real time, thereby improving the utilization rate of the cooling water.

[0056] As one of the optional embodiments, the operating parameters also include the pressure difference before and after the exhaust gas recirculation valve 25;

[0057] The current intake flow rate Q0 is calculated based on the current intake air temperature T2 and the pressure difference ΔP before and after the exhaust gas recirculation valve 25 .

[0058] Specifically, the current intake air flow rate Q0 is calculated by reading the current intake air temperature T2 in the EGR system and the pressure difference ΔP before and after the exhaust gas recirculation valve 25 through the vehicle's EMS (Engine Management System), and using a preset internal calculation formula.

[0059] It is worth noting that, in the prior art, the cooling solution used by the EGR system generally adopts the cooling circuit of the engine itself, so that the EGR cooling method cannot well match the cooling demand of the EGR gas. This embodiment can more accurately analyze the cooling demand of the EGR gas in real time by collecting the intake temperature, water intake temperature and intake flow rate in real time, so as to obtain an accurate target water intake flow rate, thereby improving the existing EGR cooling method in a more targeted manner, so that the cooling water flow rate flowing into the EGR cooler 24 meets the cooling demand of the EGR gas.

[0060] As one of the optional embodiments, in step S13, the target water inlet flow rate Q1 is corrected according to the current intake air temperature T2 to obtain the corrected target water inlet flow rate Q2, including:

[0061] S131, when it is determined that the current intake air temperature T2 is greater than or equal to the first preset temperature, correcting the target water inlet flow rate Q1 to a preset flow rate to obtain a corrected target water inlet flow rate Q2;

[0062] S132, when it is determined that the current intake air temperature T2 is less than the first preset temperature, based on the correspondence between the EGR gas temperature and the flow correction coefficient, determining a target flow correction coefficient corresponding to the current intake air temperature T2;

[0063] S133, multiplying the target water inlet flow rate Q1 by the target flow rate correction coefficient to obtain a corrected target water inlet flow rate Q2, and when it is determined that the corrected target water inlet flow rate Q2 is greater than a preset flow rate, modifying the corrected target water inlet flow rate to the preset flow rate.

[0064] Exemplarily, the first preset temperature is 150°C, and the preset flow rate is the maximum flow rate obtained by the EGR cooler 24 when the cooling water flow control member 22 operates at the highest speed. Preferably, the preset flow rate is 15L / min. When T2≥150°C, the target water inlet flow rate Q1 is corrected to 15L / min; when T2≤150°C, if T2≤45°C, the flow correction coefficient is set to 1, that is, Q2=Q1*1; if 45°C≤T2≤60°C, the flow correction coefficient is set to 1.5, that is, Q2=Q1*1.5; if 60°C≤T2≤80°C, the flow correction coefficient is set to 2, that is, Q2=Q1*2; if 80°C≤T2≤150°C, the flow correction coefficient is set to 3, that is, Q2=Q1*3.

[0065] It should be noted that the values ​​of the first preset temperature, the preset flow rate and the flow correction coefficient corresponding to each EGR gas temperature can be set according to actual needs or experiments, which are only used as examples and are not limited here.

[0066] It is worth noting that the cooling water flow output by the engine cooling circuit is corrected by the current intake temperature collected in real time, so that the cooling water flow of the EGR cooler 24 can be adjusted in real time according to the real-time cooling status of the current EGR system to meet the flow requirements under different working conditions. The cooling water flow flowing into the EGR cooler 24 meets the cooling requirements of the EGR gas, which is beneficial to improving the engine's filling coefficient and reducing the engine's maximum temperature and knock.

[0067] Further, when it is determined that the current intake air temperature T2 is greater than or equal to the first preset temperature, the method further includes:

[0068] The EGR system is controlled to switch to the closed state until it is detected that the EGR gas temperature at the air inlet of the EGR cooler 24 drops to a second preset temperature, and then the EGR system is controlled to switch to the running state; wherein the second preset temperature is lower than the first preset temperature.

[0069] Exemplarily, when T2 ≥ 150°C, the target water inlet flow rate Q1 is corrected to 15 L / min, and the EGR system is controlled to switch to the closed state. Then the EGR gas temperature will drop. When the temperature drops to 145°C, the EGR system will switch back to the operating state.

[0070] It should be noted that the value of the second preset temperature can be set according to actual needs or experiments, and is only used as an example and not limited here.

[0071] It is worth noting that since the EGR system controls the flow through the cooling water flow control component 22, thereby adjusting the cooling water flow entering the EGR cooler 24, when the corrected cooling water flow has exceeded the flow corresponding to the maximum speed of the cooling water flow control component 22, the corrected cooling water flow needs to be adjusted to prevent the cooling water flow control component 22 from malfunctioning, thereby ensuring the normal operation of the EGR system.

[0072] As one of the optional embodiments, Figure 2As shown, the cooling water flow control component 22 is connected to the EGR cooler 24 to form a cooling branch, the liquid inlet of the cooling water flow control component 22 is connected to the liquid outlet of the electric drive system heat dissipation device 21 of the vehicle, the liquid outlet of the cooling water flow control component 22 is connected to the liquid inlet of the EGR cooler 24, and the liquid outlet of the EGR cooler 24 is connected to the liquid inlet of the electric drive system heat dissipation device 21, so that the cooling water of the electric drive system heat dissipation device 21 of the vehicle can be introduced into the EGR cooler 24.

[0073] It should be noted that, in the prior art, the EGR cooler is usually connected to the engine cooling system as one of the cooling elements, so as to use the cooling water of the engine's own cooling circuit to cool the high-temperature EGR gas through the EGR cooler, but this solution has three obvious defects: on the one hand, since the engine cooling water temperature is usually high, the temperature of the EGR gas after cooling through the EGR cooler is naturally high, which is not conducive to improving the intake filling coefficient; on the other hand, the engine cooling system uses the rated point or the ring mold operating point as the design and verification point of the engine cooling system, and the EGR maximum heat dissipation point is often not at these two operating points, which puts higher requirements on the design and verification of the engine cooling system and increases the complexity of the engine pipeline layout; finally, since the water temperature used in the EGR cooling circuit is high, the gas temperature passing through the EGR circuit is also high, which also puts higher requirements on the temperature resistance of the EGR valve and the EGR pressure difference hose. This embodiment can effectively meet the cooling demand of the EGR gas by utilizing the cooling water in the electric drive system heat dissipation device 21 with lower water temperature to introduce into the EGR cooler to reduce the EGR gas temperature. In addition, it has a simple structure and has low requirements on the temperature resistance of the EGR valve and the EGR pressure difference hose.

[0074] Further, in step S14, the cooling water flow control element 22 is flow-controlled according to the corrected target water inlet flow to adjust the cooling water flow entering the EGR cooler 24, including:

[0075] S141, obtaining the heat dissipation demand flow of the intelligent power switch 23 of the vehicle; wherein the intelligent power switch 23 is cooled by a cooling branch;

[0076] S142, comparing the corrected target water inlet flow rate and the heat dissipation demand flow rate of the intelligent power switch to determine the larger value of the two;

[0077] S143 . Based on the larger value, the cooling water flow control element 22 is controlled to adjust the cooling water flow entering the EGR cooler 24 .

[0078] It should be noted that the heat dissipation demand flow of the intelligent power switch 23 can be a preset standard heat dissipation demand flow of the intelligent power switch 23, or a real-time heat dissipation demand flow determined according to the real-time working condition of the intelligent power switch 23, and there is no limitation here.

[0079] Exemplarily, after determining the larger value of the corrected target water inlet flow and the heat dissipation demand flow of the intelligent power switch, the comparison result is fed back to the VCU, and then the speed of the cooling water flow control component 22 is controlled by the VCU, and then the cooling water flow control component 22 is flow controlled to adjust the cooling water flow entering the EGR cooler 24.

[0080] In this embodiment, after the cooling water in the electric drive system heat dissipation device 21 is introduced into the EGR cooler 24, it can not only ensure the cooling demand of the EGR gas, but also take into account the heat dissipation demand of the intelligent power switch 23 in the EGR system, thereby ensuring the normal operation of the vehicle.

[0081] It should be noted that, in actual application, under the condition of ensuring the same effect and function, the cooling water flow control element 22 and the intelligent power switch 23 can also be equivalently replaced by other structures and devices, which is not limited here.

[0082] As one of the optional embodiments, when the EGR system of the vehicle is in an operating state, before obtaining the operating parameters of the EGR system, the method further includes:

[0083] S21, after the vehicle is powered on, performing fault detection on the target sensor in the EGR system to obtain a detection result; wherein the target sensor includes a first sensor for detecting the engine water temperature, a second sensor for detecting the current intake air temperature, a third sensor for detecting the current intake water temperature, and a fourth sensor for detecting the vehicle ambient temperature;

[0084] S22: When the detection result shows that none of the target sensors is in a fault state, the target sensors are controlled to collect temperature, and when it is determined that the EGR system start-up conditions are met according to the temperature collection result, the EGR system is controlled to switch to the running state.

[0085] For example, see Figure 2After the vehicle is powered on, the ECU performs fault detection on the first sensor S1 for detecting the water temperature T1 of the engine and the second sensor S2 for detecting the current intake air temperature T2. The VCU performs fault detection on the third sensor S3 for detecting the current intake water temperature T3 and the fourth sensor S4 for detecting the vehicle ambient temperature T4. If at least one of the above target sensors is detected to be faulty, an alarm is issued, and the cooling water flow control element 22 is controlled according to 100% PWM, that is, it runs at the current maximum flow rate; if none of the above target sensors is in a faulty state, the target sensors are controlled to collect temperatures to obtain T1~T4, and when it is determined that the EGR system startup conditions are met according to the temperature collection results, the EGR system is controlled to switch to the running state. Among them, the temperature conditions that make the EGR system startup conditions meet are: T1≥60℃, T2≤150℃, T3≥17℃, T4≥0℃.

[0086] It is understandable that, further, when the temperature acquisition result does not meet the EGR system startup condition, the EGR system is controlled to remain closed. When the EGR system is in the closed state, the EGR cooler has no specified flow demand. At this time, if the cooling water flowing into the EGR cooler 24 is provided by the electric drive system heat dissipation device 21, and the intelligent power switch 23 is cooled by the cooling branch formed by the cooling water flow control component 22 and the EGR cooler 24, the speed of the cooling water flow control component 22 is determined by the heat dissipation demand of the intelligent power switch 23.

[0087] It should be noted that the EGR system start-up condition can be set according to actual needs or tests, which is only an example and not limited here. In addition, the speed of the cooling water flow control member 22 can also be jointly determined by the intelligent power switch 23 and the heat dissipation requirements of other related equipment of the vehicle. The specific heat dissipation requirements can be set according to actual needs or tests, which is only an example and not limited here.

[0088] It is worth mentioning that after the vehicle is powered on, the fault status of each sensor needs to be checked to ensure the accuracy of the measurement results of each sensor. When confirming that the sensor is in normal working condition, the operating status of EGR needs to be judged based on the temperature detected by the sensor so that the EGR system can perform normal cooling control work.

[0089] See also Figure 3 , is a schematic structural diagram of a cooling control device for an EGR system provided by an embodiment of the present invention, comprising:

[0090] The parameter acquisition module 31 is used to acquire the operating parameters of the EGR system when the EGR system of the vehicle is in operation; wherein the operating parameters include the current intake air temperature, the current intake air flow rate and the current intake water temperature of the EGR cooler 24;

[0091] A flow acquisition module 32, for determining a target water inlet flow corresponding to the current air intake flow and the current water inlet temperature based on a preset correspondence relationship between the air intake flow, the water inlet temperature and the water inlet flow;

[0092] A flow correction module 33, used for correcting the target water inlet flow rate according to the current intake air temperature to obtain a corrected target water inlet flow rate;

[0093] The cooling control module 34 is used to control the cooling water flow control element 22 according to the corrected target water inlet flow, so as to adjust the cooling water flow entering the EGR cooler 24 .

[0094] Compared with the prior art, the cooling control device of an EGR system provided in the embodiment of the present invention can obtain the operating parameters of the EGR system through the parameter acquisition module 31, determine the target water inlet flow corresponding to the current intake air flow and the current water inlet temperature through the flow acquisition module 32, obtain the corrected target water inlet flow through the flow correction module 33, and adjust the cooling water flow entering the EGR cooler 24 through the cooling control module 34. By adopting the embodiment of the present invention, the cooling water flow flowing into the EGR cooler can be adjusted according to the cooling demand of the EGR gas, which solves the problem that the existing EGR cooling method cannot well match the cooling demand of the EGR gas, thereby improving the utilization rate of the cooling water, and further optimizing the outlet temperature of the EGR cooler, which is conducive to improving the filling coefficient of the engine, reducing the maximum temperature and knock of the engine, and achieving fuel saving and emission reduction.

[0095] As one of the optional embodiments, the operating parameters also include a pressure difference before and after the exhaust gas recirculation valve;

[0096] The current intake air flow rate is calculated based on the current intake air temperature and the pressure difference before and after the exhaust gas recirculation valve.

[0097] As one of the optional embodiments, the flow correction module 33 is specifically used for:

[0098] When it is determined that the current intake air temperature is greater than or equal to a first preset temperature, the target water intake flow rate is corrected to a preset flow rate to obtain a corrected target water intake flow rate;

[0099] When it is determined that the current intake air temperature is less than the first preset temperature, determining a target flow correction coefficient corresponding to the current intake air temperature based on a corresponding relationship between the EGR gas temperature and the flow correction coefficient;

[0100] The target water inlet flow rate is multiplied by the target flow rate correction coefficient to obtain a corrected target water inlet flow rate, and when it is determined that the corrected target water inlet flow rate is greater than the preset flow rate, the corrected target water inlet flow rate is modified to the preset flow rate.

[0101] Furthermore, when determining that the current intake air temperature is greater than or equal to the first preset temperature, the flow correction module 33 is further configured to:

[0102] The EGR system is controlled to switch to a closed state until it is detected that the EGR gas temperature at the air inlet of the EGR cooler drops to a second preset temperature, and the EGR system is controlled to switch to a running state; wherein the second preset temperature is lower than the first preset temperature.

[0103] As one of the optional embodiments, the cooling water flow control component is connected to the EGR cooler to form a cooling branch; wherein, the liquid inlet of the cooling water flow control component is connected to the liquid outlet of the vehicle's electric drive system heat dissipation device, the liquid outlet of the cooling water flow control component is connected to the liquid inlet of the EGR cooler, and the liquid outlet of the EGR cooler is connected to the liquid inlet of the electric drive system heat dissipation device.

[0104] Furthermore, the cooling control module 34 is specifically used for:

[0105] Acquiring a heat dissipation demand flow of an intelligent power switch of the vehicle; wherein the intelligent power switch is cooled by the cooling branch;

[0106] Comparing the corrected target water inlet flow rate with the heat dissipation demand flow rate of the intelligent power switch to determine the larger value of the two;

[0107] The cooling water flow control element performs flow control according to the larger value to adjust the cooling water flow entering the EGR cooler.

[0108] Furthermore, the device further comprises an EGR system state control module, and the EGR system state control module is specifically used for:

[0109] After the vehicle is powered on, a fault detection is performed on a target sensor in the EGR system to obtain a detection result; wherein the target sensor includes a first sensor for detecting engine water temperature, a second sensor for detecting the current intake air temperature, a third sensor for detecting the current intake water temperature, and a fourth sensor for detecting the vehicle ambient temperature;

[0110] When the detection result shows that none of the target sensors are in a fault state, the target sensors are controlled to collect temperature, and when it is determined that the EGR system start-up conditions are met according to the temperature collection result, the EGR system is controlled to switch to an operating state.

[0111] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific description of the working process and beneficial effects of the device in the above embodiment can refer to the aforementioned method embodiment, which will not be repeated here.

[0112] See also Figure 4 , is a structural diagram of a terminal device provided by an embodiment of the present invention.

[0113] The terminal device 4 of this embodiment includes: a processor 40, a memory 41, and a computer program stored in the memory 41 and executable on the processor 40. When the processor 40 executes the computer program, the steps in the above-mentioned cooling control method embodiments of the EGR system are implemented. Alternatively, when the processor 40 executes the computer program, the functions of the modules in the above-mentioned device embodiments are implemented.

[0114] Exemplarily, the computer program may be divided into one or more modules, which are stored in the memory 41 and executed by the processor 40 to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device 4.

[0115] The terminal device 4 may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will appreciate that the schematic diagram is merely an example of a terminal device and does not constitute a limitation on the terminal device. The terminal device 4 may include more or fewer components than shown in the diagram, or may combine certain components, or different components. For example, the terminal device 4 may also include an input / output device, a network access device, a bus, etc.

[0116] The processor 40 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor 40 is the control center of the terminal device 4, and various parts of the entire terminal device 4 are connected using various interfaces and lines.

[0117] The memory 41 can be used to store the computer program and / or module. The processor 40 realizes various functions of the terminal device 4 by running or executing the computer program and / or module stored in the memory 41 and calling the data stored in the memory 41. The memory 41 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory 41 can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0118] Wherein, if the module integrated in the terminal device 4 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor 40, the steps of the above-mentioned various method embodiments can be implemented. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0119] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0120] An embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the cooling control method of the EGR system as described above.

[0121] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A cooling control method for an EGR system, characterized in that: The following steps are involved: When the EGR system of the vehicle is in operation, obtaining operation parameters of the EGR system; wherein the operation parameters include a current intake air temperature, a current intake air flow rate, and a current intake water temperature of the EGR cooler; Determining a target water inlet flow rate corresponding to the current air inlet flow rate and the current water inlet temperature based on a preset corresponding relationship between the air inlet flow rate, the water inlet temperature and the water inlet flow rate; Correcting the target water inlet flow rate according to the current intake air temperature to obtain a corrected target water inlet flow rate; According to the corrected target water inlet flow rate, controlling the cooling water flow control element to adjust the cooling water flow rate entering the EGR cooler; The target water inlet flow rate is corrected according to the current intake air temperature to obtain a corrected target water inlet flow rate, including: When it is determined that the current intake air temperature is greater than or equal to a first preset temperature, the target water intake flow rate is corrected to a preset flow rate to obtain a corrected target water intake flow rate; When it is determined that the current intake air temperature is less than the first preset temperature, determining a target flow correction coefficient corresponding to the current intake air temperature based on a corresponding relationship between the EGR gas temperature and the flow correction coefficient; The target water inlet flow rate is multiplied by the target flow rate correction coefficient to obtain a corrected target water inlet flow rate, and when it is determined that the corrected target water inlet flow rate is greater than the preset flow rate, the corrected target water inlet flow rate is modified to the preset flow rate.

2. The cooling control method of the EGR system according to claim 1, characterized in that: The operating parameters also include the pressure difference before and after the exhaust gas recirculation valve; The current intake air flow rate is calculated based on the current intake air temperature and the pressure difference before and after the exhaust gas recirculation valve.

3. The cooling control method of the EGR system according to claim 1, characterized in that: When it is determined that the current intake air temperature is greater than or equal to a first preset temperature, the method further includes: The EGR system is controlled to switch to a closed state until it is detected that the EGR gas temperature at the air inlet of the EGR cooler drops to a second preset temperature, and the EGR system is controlled to switch to a running state; wherein the second preset temperature is lower than the first preset temperature.

4. The cooling control method of the EGR system according to claim 1, characterized in that: The cooling water flow control component is connected to the EGR cooler to form a cooling branch; wherein the liquid inlet of the cooling water flow control component is connected to the liquid outlet of the vehicle's electric drive system heat dissipation device, the liquid outlet of the cooling water flow control component is connected to the liquid inlet of the EGR cooler, and the liquid outlet of the EGR cooler is connected to the liquid inlet of the electric drive system heat dissipation device.

5. The cooling control method of the EGR system according to claim 4, characterized in that: The cooling water flow control element is controlled according to the corrected target water inlet flow to adjust the cooling water flow entering the EGR cooler, including: Acquiring a heat dissipation demand flow of an intelligent power switch of the vehicle; wherein the intelligent power switch is cooled by the cooling branch; Comparing the corrected target water inlet flow rate with the heat dissipation demand flow rate of the intelligent power switch to determine the larger value of the two; The cooling water flow control element performs flow control according to the larger value to adjust the cooling water flow entering the EGR cooler.

6. The cooling control method of the EGR system according to claim 4, characterized in that: When the EGR system of the vehicle is in an operating state, before obtaining the operating parameters of the EGR system, the method further includes: After the vehicle is powered on, a fault detection is performed on a target sensor in the EGR system to obtain a detection result; wherein the target sensor includes a first sensor for detecting engine water temperature, a second sensor for detecting the current intake air temperature, a third sensor for detecting the current intake water temperature, and a fourth sensor for detecting the vehicle ambient temperature; When the detection result shows that none of the target sensors are in a fault state, the target sensors are controlled to collect temperature, and when it is determined that the EGR system start-up conditions are met according to the temperature collection result, the EGR system is controlled to switch to an operating state.

7. A cooling control device for an EGR system, characterized in that: include: A parameter acquisition module, used for acquiring operating parameters of the EGR system when the EGR system of the vehicle is in operation; wherein the operating parameters include a current intake air temperature, a current intake air flow rate and a current intake water temperature of the EGR cooler; A flow acquisition module, configured to determine a target water inlet flow corresponding to the current air inlet flow and the current water inlet temperature based on a preset correspondence between the air inlet flow, the water inlet temperature and the water inlet flow; A flow correction module, used for correcting the target water inlet flow according to the current intake air temperature to obtain a corrected target water inlet flow; a cooling control module, configured to control the cooling water flow control element according to the corrected target water inlet flow, so as to adjust the cooling water flow entering the EGR cooler; The target water inlet flow rate is corrected according to the current intake air temperature to obtain a corrected target water inlet flow rate, including: When it is determined that the current intake air temperature is greater than or equal to a first preset temperature, the target water intake flow rate is corrected to a preset flow rate to obtain a corrected target water intake flow rate; When it is determined that the current intake air temperature is less than the first preset temperature, determining a target flow correction coefficient corresponding to the current intake air temperature based on a corresponding relationship between the EGR gas temperature and the flow correction coefficient; The target water inlet flow rate is multiplied by the target flow rate correction coefficient to obtain a corrected target water inlet flow rate, and when it is determined that the corrected target water inlet flow rate is greater than the preset flow rate, the corrected target water inlet flow rate is modified to the preset flow rate.

8. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the cooling control method of the EGR system according to any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the cooling control method of the EGR system according to any one of claims 1 to 6.

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