EGR condenser control method and device, controller, EGR system and vehicle

Abstract

The invention relates to the technical field of vehicle emission control, in particular to a control method and device of an EGR condenser, a controller, an EGR system and a vehicle, and the control method of the EGR condenser comprises the steps that the temperature of cooling liquid in the EGR condenser is obtained, and whether the temperature of the cooling liquid is larger than a first preset temperature or not is detected; if the temperature of the cooling liquid is larger than the first preset temperature, the current fuel injection quantity of the engine is determined, and whether the current fuel injection quantity exceeds the preset fuel injection quantity or not is detected; if the current fuel injection quantity exceeds the preset fuel injection quantity, a bypass valve of the EGR condenser is controlled to be in a closed state; and if the current fuel injection quantity does not exceed the preset fuel injection quantity, the bypass valve is controlled to be in an open state. Thus, the cooling effect is considered, meanwhile, the load state of the engine is also considered, the problem of carbon deposition or coking caused by the low temperature of waste gas in the EGR condenser is more comprehensively avoided, the heat exchange efficiency of the EGR condenser is improved, and the risk of abnormal emission is avoided.

Description

Technical Field

[0001] The present application relates to the field of vehicle emission control, and in particular to a control method, device, controller, EGR system and vehicle for an EGR condenser. Background Art

[0002] Exhaust Gas Recirculation (EGR) refers to the process of reintroducing part of the exhaust gas discharged by the engine into the intake manifold through a dedicated pipeline, where it is mixed with fresh air and then participates in the combustion cycle again.

[0003] While polyatomic gases like CO2 and water vapor in exhaust gas can effectively reduce NOx generation, they also present new challenges for EGR systems: EGR increases the emission of soot particles in the exhaust gas. As these soot particles and unburned hydrocarbons pass through the EGR condenser, they undergo a phase change due to the cooling process of the circulating water. This causes a mixture of soot and hydrocarbons to deposit on the EGR condenser fin surfaces. The long-term accumulation of these deposits can form structural carbon deposits and even coking, significantly reducing the condenser's heat exchange efficiency and, in severe cases, causing system performance degradation, ultimately leading to adverse consequences such as excessive vehicle emissions. Summary of the Invention

[0004] In view of this, the present application is dedicated to providing a control method, device, controller, EGR system and vehicle for an EGR condenser, which can effectively solve the problem of carbon deposition or coking in the EGR condenser and improve the heat exchange efficiency of the EGR condenser.

[0005] A first aspect of the present application provides a control method for an EGR condenser, which is applied to an EGR system, wherein the EGR system includes an EGR condenser. The method includes:

[0006] Obtaining a temperature of the coolant in the EGR condenser, and detecting whether the temperature of the coolant is greater than a first preset temperature;

[0007] If the temperature of the coolant is greater than the first preset temperature, determining a current fuel injection amount of the engine, and detecting whether the current fuel injection amount exceeds a preset fuel injection amount;

[0008] If the current fuel injection amount exceeds the preset fuel injection amount, the bypass valve of the EGR condenser is controlled to be in a closed state; if the current fuel injection amount does not exceed the preset fuel injection amount, the bypass valve is controlled to be in an open state.

[0009] In the above embodiment, the determination of the engine fuel injection amount is combined with the determination of the coolant temperature, that is, while considering the cooling effect, the size of the engine load state is also considered, which more comprehensively avoids the problem of carbon deposition or coking caused by the low exhaust gas temperature in the EGR condenser, improves the heat exchange efficiency of the EGR condenser, and avoids the risk of abnormal emissions.

[0010] Optionally, before obtaining the temperature of the coolant in the EGR condenser, the method further includes:

[0011] Acquiring the exhaust gas temperature after being cooled by the EGR condenser, and detecting whether the exhaust gas temperature exceeds a second preset temperature;

[0012] If the exhaust gas temperature exceeds the second preset temperature, the bypass valve of the EGR condenser is controlled to be in a closed state; if the exhaust gas temperature does not exceed the second preset temperature, the step of obtaining the temperature of the coolant in the EGR condenser is continued.

[0013] In the above embodiment, the control accuracy of the EGR condenser can be improved, and the occurrence of carbon deposition or coking of deposits in the EGR condenser can be further avoided.

[0014] Optionally, the EGR system includes a temperature detection unit, which is provided on the EGR post-condensation pipeline. The step of obtaining the exhaust gas temperature after cooling by the EGR condenser includes:

[0015] Acquiring the temperature detected by the temperature detection unit;

[0016] The temperature detected by the temperature detection unit is determined as the exhaust gas temperature after being cooled by the EGR condenser.

[0017] In the above embodiment, the accurate temperature of the recirculating exhaust gas can be obtained, which provides a guarantee for preventing the recirculating exhaust gas from damaging the condenser.

[0018] Optionally, detecting whether the temperature of the coolant is greater than a first preset temperature includes:

[0019] determining a current speed of the engine;

[0020] Determining the temperature corresponding to the current speed of the engine based on a pre-established correspondence between the engine speed and the temperature of the coolant, and determining the temperature corresponding to the current speed of the engine as the first preset temperature;

[0021] Detecting whether the temperature of the coolant is greater than the first preset temperature.

[0022] In the above embodiment, under the premise of taking into account the working state of the engine and the working state of the EGR condenser, a suitable first preset temperature can be quickly determined, which lays a foundation for improving the accuracy of controlling the bypass valve.

[0023] Optionally, detecting whether the current fuel injection amount exceeds a preset fuel injection amount includes:

[0024] determining a current speed of the engine;

[0025] Determining the fuel injection amount corresponding to the current speed of the engine based on a preset correspondence between the engine speed and the fuel injection amount, and determining the fuel injection amount corresponding to the current speed of the engine as the preset fuel injection amount;

[0026] Detecting whether the current fuel injection amount exceeds the preset fuel injection amount.

[0027] In the above embodiment, under the premise of taking into account the working state and the load state of the engine, the appropriate preset fuel injection amount can be quickly determined, which also lays a foundation for improving the accuracy of controlling the bypass valve.

[0028] Optionally, after detecting whether the temperature of the coolant is greater than a first preset temperature, the method further includes:

[0029] If the temperature of the coolant is less than or equal to the first preset temperature, the bypass valve is controlled to be in an open state.

[0030] In the above embodiment, the carbon deposition or coking problem caused by the low-temperature exhaust gas passing through the EGR condenser can be avoided more comprehensively.

[0031] A second aspect of the present application provides a control device for an EGR condenser, comprising:

[0032] an acquisition and detection module, configured to acquire the temperature of the coolant in the EGR condenser and detect whether the temperature of the coolant is greater than a first preset temperature;

[0033] a determination and detection module, configured to determine a current fuel injection amount of the engine if the temperature of the coolant is greater than the first preset temperature, and detect whether the current fuel injection amount exceeds a preset fuel injection amount;

[0034] A control module is configured to control the bypass valve of the EGR condenser to be in a closed state if the current fuel injection amount exceeds the preset fuel injection amount; and to control the bypass valve to be in an open state if the current fuel injection amount does not exceed the preset fuel injection amount.

[0035] A third aspect of the present application provides a controller, comprising:

[0036] a processor, and a memory connected to the processor;

[0037] The memory is used to store computer programs;

[0038] The processor is used to call and execute the computer program in the memory to perform the control method of the EGR condenser as described in the first aspect of the present application.

[0039] A fourth aspect of the present application provides an EGR system comprising an EGR condenser and the controller according to the third aspect of the present application.

[0040] A fifth aspect of the present application provides a vehicle comprising the EGR system as described in the fourth aspect of the present application.

[0041] A fifth aspect of the present application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the control method of the EGR condenser as described in any one of the first aspects above is implemented.

[0042] In a sixth aspect, the present application provides a computer program product comprising instructions, which, when executed by a computer, enables the computer to execute the control method for the EGR condenser as described in the first aspect above.

[0043] In the solution of the present application, the temperature of the coolant in the EGR condenser is first obtained, and the coolant temperature is detected to be greater than a first preset temperature. If the coolant temperature is greater than the first preset temperature, it indicates that the coolant temperature is not too low and the exhaust gas passing through the EGR condenser will not cause excessive cooling. The current fuel injection amount of the engine is then determined, and the current fuel injection amount is detected to be greater than the preset injection amount. If the current fuel injection amount exceeds the preset injection amount, it indicates that the engine is currently under heavy load and the exhaust gas temperature is high, and the bypass valve of the EGR condenser is controlled to be closed. If the current fuel injection amount does not exceed the preset injection amount, it indicates that the engine is currently under light load and the exhaust gas temperature is low, and the bypass valve is controlled to be open. In this way, the determination of the engine fuel injection amount is combined with the determination of the coolant temperature. That is, the engine load is taken into account not only the cooling effect but also the magnitude of the engine load. This more comprehensively avoids the problem of carbon deposition or coking caused by low exhaust gas temperature in the EGR condenser, improves the heat exchange efficiency of the EGR condenser, and avoids the risk of abnormal emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] Figure 1 This is a structural diagram of an EGR system provided in one embodiment of the present application.

[0046] Figure 2 This is a flow chart of a control method for an EGR condenser provided in one embodiment of the present application.

[0047] Figure 3 This is a flow chart of a method for controlling an EGR condenser provided in another embodiment of the present application.

[0048] Figure 4 This is a structural diagram of a driving assistance device provided in one embodiment of the present application.

[0049] Figure 5 This is a schematic diagram of the structure of a controller provided in one embodiment of the present application. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] In the field of automotive emissions control, the EGR system is a mainstream emission reduction method. This system redirects a portion of the engine's exhaust gas through the EGR line into the intake manifold, where it mixes with fresh air before re-entering the cylinders for combustion. During this process, polyatomic gases such as CO2 and water vapor contained in the exhaust gas significantly suppress the formation of nitrogen oxides, thereby reducing nitrogen oxide emissions.

[0052] However, while the EGR system reduces nitrogen oxide emissions, it also introduces new problems: The large amount of soot particles and unburned hydrocarbons carried in the exhaust gas are cooled by the circulating water as they flow through the EGR condenser. When the exhaust gas temperature drops to the critical range of 70-100°C, the soot particles and hydrocarbons mix and adsorb, gradually settling on the condenser fin surface, forming deposits. The long-term accumulation of these deposits can form stubborn carbon deposits or coking, which not only reduces the condenser's heat exchange efficiency but can also lead to emission abnormalities in severe cases.

[0053] To this end, an embodiment of the present application provides a control method for an EGR condenser. The control method for an EGR condenser can be applied to an EGR system, and the EGR system can include an EGR condenser.

[0054] Specifically, such as Figure 1 The following diagram shows the structure of an EGR system. During operation, as the high-temperature exhaust gas from the engine exits the exhaust manifold, a portion of it is intercepted (as shown in the EGR exhaust gas diagram) and enters the EGR exhaust gas inlet line ①. The EGR valve ② adjusts the amount of exhaust gas recirculation based on EGR system instructions. The EGR condenser ③ and EGR bypass line ⑤ are connected in parallel, with an EGR condenser bypass valve ④ installed on the EGR bypass line ⑤.

[0055] On the one hand, when the EGR condenser bypass valve ④ is closed, the high-temperature exhaust gas passing through EGR valve ② enters the EGR condenser ③, where it exchanges heat with the coolant in the EGR condenser ③, cooling the exhaust gas. The cooled exhaust gas then re-enters the intake manifold through the EGR condenser pipe ⑦. Lowering the exhaust gas temperature reduces the heat load, enhances its inertness, and suppresses combustion temperatures.

[0056] On the other hand, when EGR condenser bypass valve ④ is open, high-temperature exhaust gas passes through EGR valve ② and enters EGR bypass line ⑤. It then flows through EGR bypass line ⑤ to EGR post-condensation line ⑦, and re-enters the intake manifold through EGR post-condensation line ⑦. The configuration of condenser bypass line ⑤ and condenser bypass valve ④ can reduce the amount of soot and hydrocarbons entering the EGR condenser to a certain extent, thereby alleviating the problem of carbon deposits or coking in the EGR condenser and laying the structural foundation for protecting the EGR condenser.

[0057] Furthermore, in order to better protect the condenser, avoid carbon deposition or coking problems, and avoid the risk of abnormal emissions, such as Figure 2 As shown, the control method of the EGR condenser may include at least the following implementation steps:

[0058] S201 : Obtain the temperature of the coolant in the EGR condenser, and detect whether the temperature of the coolant is greater than a first preset temperature.

[0059] During implementation, the EGR system may further include a temperature sensor, which may be located in the condenser. Alternatively, in some embodiments, the coolant in the EGR condenser and the coolant in the engine may flow through the same coolant circuit. Therefore, the temperature of the coolant in the EGR condenser can be measured by the engine's built-in water temperature sensor, eliminating the need for additional cost. In this way, the temperature of the coolant in the EGR condenser can be determined using either the temperature sensor located in the EGR condenser or the engine's built-in temperature sensor, providing data support for subsequent control of the bypass valve's opening and closing.

[0060] Specifically, the temperature of the coolant in the EGR condenser can be obtained at preset time intervals, and the coolant temperature can be detected to determine whether it is greater than a first preset temperature. The preset time interval can be set based on actual needs and is not specifically defined herein. This allows for automatic, real-time acquisition of the coolant temperature, laying the foundation for automatic, real-time control of the EGR condenser.

[0061] It should be noted that in the embodiments of the present application, the first preset temperature is set to provide different operating states for the EGR condenser. When the coolant temperature is higher than the first preset temperature, the coolant can cool normally, indicating that the condenser is operating normally, and step S202 can proceed. When the coolant temperature is equal to or lower than the first preset temperature, the coolant has a stronger cooling function, indicating that the condenser is not operating normally.

[0062] In specific implementations, the first preset temperature can be determined based on actual needs and the engine speed, and is not specifically limited herein. The engine speed can represent the engine's operating state. The higher the engine speed, the higher the exhaust gas temperature, requiring a lower coolant temperature. Accordingly, the coolant temperature under normal operating conditions is lower, and thus the first preset temperature is lower.

[0063] S202: Determine the current fuel injection amount of the engine, and detect whether the current fuel injection amount exceeds a preset fuel injection amount.

[0064] In the EGR system, the fuel injection amount of the injector represents the fuel injection amount accurately calculated by the engine's control unit to achieve efficient combustion, emission control and power requirements.

[0065] It should be noted that, in the embodiments of the present application, a preset fuel injection amount is set, which can be used to characterize different engine load states. The greater the fuel injection amount, the higher the torque and power output of the engine, and the heavier the load (such as acceleration, climbing, and high speed). Based on this, when the current fuel injection amount exceeds the preset fuel injection amount, it can be characterized as the engine being in a high-load state, and the exhaust gas temperature is high; when the current fuel injection amount does not exceed the preset fuel injection amount, it can be characterized as the engine being in a low-load state, and the exhaust gas temperature is lower than when the engine is in a high-load state.

[0066] Accordingly, the preset fuel injection amount can be determined based on actual demand and engine speed, and is not specifically limited here.

[0067] In this way, the current fuel injection amount of the engine can be obtained and compared with the preset fuel injection amount, thereby providing a basis for further controlling the operation of the EGR condenser and reducing the risk of abnormal emissions.

[0068] S203: If the current fuel injection amount exceeds the preset fuel injection amount, the bypass valve of the EGR condenser is controlled to be in a closed state; if the current fuel injection amount does not exceed the preset fuel injection amount, the bypass valve is controlled to be in an open state.

[0069] If the current fuel injection amount exceeds the preset fuel injection amount, it means that the current engine is in a high load state, the exhaust gas temperature is high, and correspondingly, the cooling demand is high. The bypass valve of the EGR condenser can be controlled to be in a closed state. In this way, the exhaust gas entering the EGR exhaust gas inlet pipe can pass through the EGR valve and enter the EGR condenser for cooling. While meeting the cooling demand, since the exhaust gas temperature is high before entering the EGR condenser and the condenser is in normal working condition, the exhaust gas can avoid excessive cooling after being cooled by the EGR condenser, thereby avoiding the situation where the soot particles and hydrocarbons in the exhaust gas are mixed and adsorbed on the fins of the EGR condenser.

[0070] Similarly, if the current fuel injection amount does not exceed the preset injection amount, it indicates that the current engine is under low load. The exhaust gas temperature is lower than that under high load, and accordingly, the cooling demand is lower. In this case, the exhaust gas can be allowed to bypass the condenser. In other words, the bypass valve is controlled to be in the open state, allowing the exhaust gas to bypass the EGR condenser and enter the EGR condensation line through the bypass valve. This can prevent the exhaust gas from being too hot and prevent the cooler exhaust gas from entering the EGR condenser. Due to the lower exhaust gas temperature, the soot particles and hydrocarbons in the exhaust gas are mixed and adsorbed on the fins of the EGR condenser.

[0071] In this embodiment, the coolant temperature in the EGR condenser is first obtained, and a test is performed to determine whether the coolant temperature is greater than a first preset temperature. If the coolant temperature is greater than the first preset temperature, indicating that the coolant temperature is not too low and that the exhaust gas passing through the EGR condenser will not cause excessive cooling, the current engine fuel injection amount is then determined, and a test is performed to determine whether the current fuel injection amount exceeds the preset injection amount. If the current fuel injection amount exceeds the preset injection amount, indicating that the engine is currently under heavy load and the exhaust gas temperature is high, the bypass valve of the EGR condenser is controlled to be closed. If the current fuel injection amount does not exceed the preset injection amount, indicating that the engine is currently under light load and the exhaust gas temperature is low, the bypass valve is controlled to be open. In this way, the determination of the engine fuel injection amount is combined with the determination of the coolant temperature. This means that the engine load is considered in addition to the cooling effect, more comprehensively avoiding carbon deposits or coking caused by low exhaust gas temperatures in the EGR condenser, improving the heat exchange efficiency of the EGR condenser, and mitigating the risk of emission abnormalities.

[0072] In some embodiments, in order to improve the control accuracy of the EGR condenser and further avoid the occurrence of carbon deposition or coking in the EGR condenser, Figure 3 As shown, before obtaining the temperature of the coolant in the EGR condenser, the control method of the EGR condenser may further include the following steps:

[0073] S204: Obtain the temperature of the exhaust gas after cooling by the EGR condenser, and detect whether the exhaust gas temperature exceeds a second preset temperature.

[0074] The exhaust gas temperature after cooling by the EGR condenser can intuitively demonstrate the cooling effect of the EGR condenser. It should be understood that when obtaining the exhaust gas temperature after cooling by the EGR condenser, it also indicates that the bypass valve is in the closed state.

[0075] Accordingly, after obtaining the exhaust gas temperature after the EGR condenser is cooled, the obtained exhaust gas temperature can be compared with the second preset temperature. On the one hand, it can be determined whether overcooling is currently occurring, providing a basis for determining whether soot particles and hydrocarbons in the exhaust gas are adsorbed on the fins of the EGR condenser. On the other hand, it can be determined whether the current engine is started warm. This provides a basis for whether to open the bypass valve, thereby improving protection for the EGR condenser.

[0076] The specific value of the second preset temperature can be set according to actual needs and is not specifically limited here. For example, the second preset temperature can be 170°C.

[0077] If the exhaust gas temperature exceeds the second preset temperature, step S205 is executed; if the exhaust gas temperature does not exceed the second preset temperature, the above step S201 is continued to be executed.

[0078] S205: Control the bypass valve of the EGR condenser to be in a closed state.

[0079] If the exhaust gas temperature exceeds the second preset temperature, it indicates that there is no overcooling and the engine is started as a hot engine. Soot particles and hydrocarbons in the cooled exhaust gas will not be adsorbed by the fins of the EGR condenser, and there is no need to open the bypass valve. The bypass valve of the EGR condenser can then be controlled to be closed. If the exhaust gas temperature does not exceed the second preset temperature, it indicates that the temperature of the exhaust gas after cooling through the condenser is relatively low. Whether to open the bypass valve can be further determined based on the temperature of the coolant and the amount of fuel injected. In other words, the above-mentioned step S201 is continued. This more comprehensively and accurately avoids the problem of carbon deposition or coking in the EGR condenser caused by the low exhaust gas temperature, and effectively improves the heat exchange efficiency of the EGR condenser.

[0080] In some embodiments, the EGR system may further include a temperature detection unit, which is disposed on the EGR post-condensation pipeline.

[0081] In practice, the temperature detection unit may be a temperature sensor, such as Figure 1 As shown, the temperature sensor ⑥ can be set on the EGR condensation line ⑦, and can detect the temperature of the exhaust gas discharged after being cooled by the EGR condenser ③ or the exhaust gas discharged through the bypass valve ④.

[0082] Accordingly, when obtaining the exhaust gas temperature after cooling through the EGR condenser, the temperature detected by the temperature detection unit can be first obtained; then the temperature detected by the temperature detection unit is determined as the exhaust gas temperature after cooling through the EGR condenser. In this way, the accurate temperature of the recirculated exhaust gas can be obtained, further ensuring that the exhaust gas temperature does not fall below 100°C, thereby preventing the recirculated exhaust gas from damaging the condenser.

[0083] In some embodiments, when detecting whether the temperature of the coolant is greater than a first preset temperature, the current speed of the engine can be determined first; then, based on a pre-established correspondence between the engine speed and the coolant temperature, the temperature corresponding to the current speed of the engine is determined, and the temperature corresponding to the current speed of the engine is determined as the first preset temperature; and then, whether the temperature of the coolant is greater than the first preset temperature is detected.

[0084] During implementation, to accurately and quickly determine whether the EGR condenser is operating normally, a pre-established relationship between engine speed and coolant temperature can be established. The higher the engine speed, the higher the exhaust gas temperature, and accordingly, the higher the cooling performance requirements for the EGR condenser, i.e., the lower the required coolant temperature. Specifically, the relationship between engine speed and coolant temperature can be determined based on actual experience and needs, and is not specifically defined here.

[0085] For example, if the coolant is water and the water temperature T is used to enable the bypass valve of the EGR condenser, when T>t (a first preset temperature), the bypass valve can be further determined based on the injection amount to determine whether to open the bypass valve; when T≤t, the bypass valve of the EGR condenser is controlled to be in the open state. Table 1 below shows the experimentally determined relationship between engine speed and water temperature. As can be seen from the table, when the engine speed is within [800 rpm, 2400 rpm], the corresponding coolant temperature is 65°C; when the engine speed is within [2400 rpm, 3400 rpm], the corresponding coolant temperature is 60°C; and when the engine speed is within [3400 rpm, 4400 rpm], the corresponding coolant temperature is 55°C.

[0086] Table 1 Correspondence between engine speed and water temperature

[0087]

[0088] In this way, under the premise of taking into account the working state of the engine and the working state of the EGR condenser, a suitable first preset temperature can be quickly determined, laying a foundation for improving the accuracy of controlling the bypass valve.

[0089] In some embodiments, when detecting whether the current fuel injection amount exceeds the preset fuel injection amount, the current engine speed can be determined first; then, based on the preset correspondence between the engine speed and the fuel injection amount, the fuel injection amount corresponding to the current engine speed is determined, and the fuel injection amount corresponding to the current engine speed is determined as the preset fuel injection amount; and then it is detected whether the current fuel injection amount exceeds the preset fuel injection amount.

[0090] During implementation, to accurately and quickly determine the engine's operating status, a pre-established relationship between engine speed and fuel injection quantity can be established. The higher the engine speed, the higher the exhaust temperature, and accordingly, the lower the required fuel injection quantity for achieving high load. Specifically, the relationship between engine speed and fuel injection quantity can be determined based on actual experience and needs, and is not specifically limited here.

[0091] For example, in the strategy for enabling the EGR condenser bypass valve based on the injection quantity Q, when Q > q (preset injection quantity), the engine is under high load and the exhaust gas temperature is high. Therefore, the EGR condenser bypass valve needs to be closed, allowing the high-temperature exhaust gas to be cooled through the EGR condenser. When Q ≤ q, the EGR condenser bypass valve is opened, allowing the exhaust gas to be diverted to the EGR bypass line. Table 2 below shows the experimentally determined relationship between engine speed and injection quantity for a specific engine. As can be seen from the table, when the engine speed is within [800 rpm, 1800 rpm], the corresponding injection quantity is 20 mg / hub; when the engine speed is within [1800 rpm, 3000 rpm], the corresponding injection quantity is 18 mg / hub; and when the engine speed is within [3000 rpm, 4400 rpm], the corresponding injection quantity is 16 mg / hub.

[0092] Table 2 Correspondence between engine speed and fuel injection amount

[0093]

[0094] In this way, while taking into account the working state and load state of the engine, the appropriate preset fuel injection amount can be quickly determined, which also lays the foundation for improving the accuracy of the control of the bypass valve.

[0095] In some embodiments, after detecting whether the coolant temperature is greater than the first preset temperature, the EGR condenser control method may further include: if the coolant temperature is less than or equal to the first preset temperature, controlling the bypass valve to be in an open state.

[0096] Specifically, the coolant temperature is less than or equal to the first preset temperature, indicating that the coolant temperature is low and has a strong cooling performance. Since the exhaust gas temperature after cooling through the EGR condenser does not exceed the second preset temperature, it can be determined that the engine is started from a cold engine. At this time, the bypass valve can be controlled to be in an open state, which provides a guarantee for further avoiding the exhaust gas temperature below 100°C, thereby more comprehensively avoiding the carbon deposition or coking problem caused by the low-temperature exhaust gas passing through the EGR condenser.

[0097] As another optional implementation of the disclosure of this application, an EGR condenser control device is also provided in the embodiment of this application, such as Figure 4As shown, the control device of the EGR condenser may include: an acquisition and detection module 401, used to acquire the temperature of the coolant in the EGR condenser and detect whether the temperature of the coolant is greater than a first preset temperature; a determination and detection module 402, used to determine the current fuel injection amount of the engine if the temperature of the coolant is greater than the first preset temperature, and detect whether the current fuel injection amount exceeds the preset fuel injection amount; a control module 403, used to control the bypass valve of the EGR condenser to be in a closed state if the current fuel injection amount exceeds the preset fuel injection amount; if the current fuel injection amount does not exceed the preset fuel injection amount, control the bypass valve to be in an open state.

[0098] Optionally, before obtaining the temperature of the coolant in the EGR condenser, the acquisition and detection module 401 can also be used to: obtain the temperature of the exhaust gas after cooling through the EGR condenser, and detect whether the exhaust gas temperature exceeds a second preset temperature; if the exhaust gas temperature exceeds the second preset temperature, the bypass valve of the EGR condenser is controlled to be in a closed state; if the exhaust gas temperature does not exceed the second preset temperature, continue to execute the step of obtaining the temperature of the coolant in the EGR condenser.

[0099] Optionally, the EGR system may include a temperature detection unit, which may be provided on the EGR post-condensation pipeline. When obtaining the exhaust gas temperature after cooling through the EGR condenser, the acquisition and detection module 401 may be specifically used to: obtain the temperature detected by the temperature detection unit; and determine the temperature detected by the temperature detection unit as the exhaust gas temperature after cooling through the EGR condenser.

[0100] Optionally, when detecting whether the temperature of the coolant is greater than a first preset temperature, the acquisition and detection module 401 can be specifically used to: determine the current speed of the engine; based on a pre-established correspondence between the engine speed and the coolant temperature, determine the temperature corresponding to the current speed of the engine, and determine the temperature corresponding to the current speed of the engine as the first preset temperature; detect whether the temperature of the coolant is greater than the first preset temperature.

[0101] Optionally, when detecting whether the current fuel injection amount exceeds the preset fuel injection amount, the determination and detection module 402 can be specifically used to: determine the current speed of the engine; based on a preset correspondence between the engine speed and the fuel injection amount, determine the fuel injection amount corresponding to the current speed of the engine, and determine the fuel injection amount corresponding to the current speed of the engine as the preset fuel injection amount; detect whether the current fuel injection amount exceeds the preset fuel injection amount.

[0102] Optionally, after detecting whether the temperature of the coolant is greater than the first preset temperature, the control module 403 may also be configured to: if the temperature of the coolant is less than or equal to the first preset temperature, control the bypass valve to be in an open state.

[0103] The specific implementation of the control device of the EGR condenser provided in the embodiments of the present application can refer to the implementation of the control method of the EGR condenser described in any of the above embodiments, and will not be repeated here.

[0104] As another optional implementation of the disclosure of this application, an embodiment of this application further provides a controller, such as Figure 5 As shown, the controller may include: a memory 501 and a processor 502; wherein the memory 501 is connected to the processor 502 for storing programs; the processor 502 is used to implement the control method of the EGR condenser disclosed in any of the above embodiments by running the program stored in the memory 501.

[0105] Specifically, the controller may further include: a bus, a communication interface 503 , an input device 504 and an output device 505 .

[0106] The processor 502, the memory 501, the communication interface 503, the input device 504 and the output device 505 are connected to each other via a bus.

[0107] A bus may include a pathway that transfers information between components of a computer system.

[0108] Processor 502 can be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, or the like, or an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application. It can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component.

[0109] The processor 502 may include a main processor, and may also include a baseband chip, a modem, etc.

[0110] The memory 501 stores a program for executing the technical solution of the present application, and may also store an operating system and other key services. Specifically, the program may include program code, and the program code may include computer operating instructions. More specifically, the memory 501 may include read-only memory (ROM), other types of static storage devices that can store static information and instructions, random access memory (RAM), other types of dynamic storage devices that can store information and instructions, disk storage, flash, etc.

[0111] The input device 504 may include a device for receiving data and information input by a user, such as a keyboard, a mouse, a camera, a scanner, a light pen, a voice input device, a touch screen, a pedometer, or a gravity sensor.

[0112] Output device 505 may include a device that allows information to be output to a user, such as a display screen, printer, speaker, etc.

[0113] The communication interface 503 may include any transceiver or similar device for communicating with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc.

[0114] The processor 502 executes the program stored in the memory 501 and calls other devices, which can be used to implement each step of the control method of the EGR condenser provided in the above embodiment of the present application.

[0115] As another optional implementation of the contents disclosed in the present application, an embodiment of the present application further provides an EGR system, which may include an EGR condenser and a controller as described in any of the above embodiments.

[0116] As another optional implementation of the content disclosed in the present application, an embodiment of the present application further provides a vehicle, which may include the EGR system as described in any of the above embodiments.

[0117] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a computer, the control method of the EGR condenser as described in any of the above embodiments is implemented.

[0118] An embodiment of the present application further provides a computer program product comprising instructions, which, when executed by a computer, enables the computer to execute the control method for the EGR condenser described in any of the above embodiments.

[0119] It should be understood that the specific examples herein are only intended to help those skilled in the art better understand the embodiments of this specification, rather than to limit the scope of the present invention.

[0120] It can be understood that in the various implementations of this specification, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the implementation methods of this specification.

[0121] It can be understood that the various embodiments described in this specification can be implemented individually or in combination, and the embodiments in this specification are not limited to this.

[0122] Unless otherwise indicated, all technical and scientific terms used in the embodiments of this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of this specification. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the scope of this specification. The term "and / or" used in this specification includes any and all combinations of one or more related listed items. The singular forms "a", "above", and "the" used in the embodiments of this specification and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0123] It is understood that the processor in the embodiments of this specification can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiment can be completed by hardware integrated logic circuits in the processor or software instructions. The above processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The various methods, steps, and logic block diagrams disclosed in the embodiments of this specification can be implemented or executed. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this specification can be directly implemented as being executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0124] It will be understood that the memory in the embodiments of this specification may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0125] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this specification.

[0126] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, devices and units can refer to the corresponding processes in the aforementioned method implementation methods and will not be repeated here.

[0127] In the several embodiments provided in this specification, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0128] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of this embodiment.

[0129] In addition, each functional unit in each embodiment of this specification may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0130] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this specification, or the part that contributes to the prior art, or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of this specification. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0131] The above description is merely a specific embodiment of this specification, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this specification should be included in the scope of protection of this specification. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A control method for an EGR condenser, characterized in that: Applied to an EGR system, the EGR system including an EGR condenser, the method comprising: Obtaining a temperature of the coolant in the EGR condenser, and detecting whether the temperature of the coolant is greater than a first preset temperature; If the temperature of the coolant is greater than the first preset temperature, determining a current fuel injection amount of the engine, and detecting whether the current fuel injection amount exceeds a preset fuel injection amount; If the current fuel injection amount exceeds the preset fuel injection amount, the bypass valve of the EGR condenser is controlled to be in a closed state; if the current fuel injection amount does not exceed the preset fuel injection amount, the bypass valve is controlled to be in an open state.

2. The method according to claim 1, characterized in that Before obtaining the temperature of the coolant in the EGR condenser, the method further includes: Acquiring the exhaust gas temperature after being cooled by the EGR condenser, and detecting whether the exhaust gas temperature exceeds a second preset temperature; If the exhaust gas temperature exceeds the second preset temperature, the bypass valve of the EGR condenser is controlled to be in a closed state; if the exhaust gas temperature does not exceed the second preset temperature, the step of obtaining the temperature of the coolant in the EGR condenser is continued.

3. The method according to claim 1, characterized in that The EGR system includes a temperature detection unit, which is arranged on the EGR condensation pipeline. The method of obtaining the exhaust gas temperature after cooling by the EGR condenser includes: Acquiring the temperature detected by the temperature detection unit; The temperature detected by the temperature detection unit is determined as the exhaust gas temperature after being cooled by the EGR condenser.

4. The method according to claim 1, wherein The detecting whether the temperature of the coolant is greater than a first preset temperature includes: determining a current speed of the engine; Determining the temperature corresponding to the current speed of the engine based on a pre-established correspondence between the engine speed and the temperature of the coolant, and determining the temperature corresponding to the current speed of the engine as the first preset temperature; Detecting whether the temperature of the coolant is greater than the first preset temperature.

5. The method according to claim 1, wherein The detecting whether the current fuel injection amount exceeds a preset fuel injection amount includes: determining a current speed of the engine; Determining the fuel injection amount corresponding to the current speed of the engine based on a preset correspondence between the engine speed and the fuel injection amount, and determining the fuel injection amount corresponding to the current speed of the engine as the preset fuel injection amount; Detecting whether the current fuel injection amount exceeds the preset fuel injection amount.

6. The method according to claim 1, characterized in that After detecting whether the temperature of the coolant is greater than a first preset temperature, the method further includes: If the temperature of the coolant is less than or equal to the first preset temperature, the bypass valve is controlled to be in an open state.

7. A control device for an EGR condenser, characterized in that: include: an acquisition and detection module, configured to acquire the temperature of the coolant in the EGR condenser and detect whether the temperature of the coolant is greater than a first preset temperature; a determination and detection module, configured to determine a current fuel injection amount of the engine if the temperature of the coolant is greater than the first preset temperature, and detect whether the current fuel injection amount exceeds a preset fuel injection amount; a control module, configured to control the bypass valve of the EGR condenser to be in a closed state if the current fuel injection amount exceeds the preset fuel injection amount; If the current fuel injection amount does not exceed the preset fuel injection amount, the bypass valve is controlled to be in an open state.

8. A controller, characterized in that: include: a processor, and a memory connected to the processor; The memory is used to store computer programs; The processor is configured to call and execute the computer program in the memory to perform the control method for the EGR condenser according to any one of claims 1 to 6.

9. An EGR system, characterized in that: The device comprises an EGR condenser and a controller as claimed in claim 8 .

10. A vehicle, characterized in that: Comprising the EGR system of claim 9.

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