An exhaust gas circulation control method, a thermal management device, a storage medium, and a controller

Abstract

The present application belongs to the technical field of internal combustion engines, and particularly relates to a waste gas circulation control method, a thermal management device, a storage medium and a controller; based on a judgment temperature sequence (369) obtained through a pre-acquisition step (099), the condensation risk of an exhaust gas circulation EGR (Exhaust Gas Recirculation) structure of an engine (066) is predicted, and a preset three-stage linkage process, i.e., a first adjustment step (100), a second adjustment step (200) and a third adjustment step (300), is adopted to avoid condensation hazards; further, through the introduction of closed-loop control, the waste gas circulation response speed and adjustment accuracy based on dew point temperature are further improved, and the heat exchange efficiency of the EGR system is improved; the technical scheme can be improved and upgraded on products such as an engine control system EMS (Engine Management System), a thermal management device (600) and a vehicle-mounted controller; while improving tail gas emission and reducing fuel consumption, the risk of misfire and flameout due to tail gas condensation of the engine (066) in variable load conditions and other scenarios is avoided.

Description

Technical Field

[0001] This invention belongs to the field of internal combustion engine technology, and particularly relates to an exhaust gas recirculation control method, a thermal management device, a storage medium, and a controller. Background Technology

[0002] Exhaust Gas Recirculation (EGR) technology is used to improve the exhaust emissions and fuel consumption of internal combustion engines and has been widely used in fuel and hybrid vehicles. However, in some operating scenarios, such as the warm-up process, water vapor condensation often occurs in the exhaust gas recirculated by the EGR valve.

[0003] Further research by the inventors revealed that, on the one hand, the aforementioned water vapor condensation process interacts with the widely used intake manifold water cooling system, further deteriorating the intake air quality of the internal combustion engine, such as producing excessive condensate; on the other hand, if the aforementioned condensate is further carried into the cylinder when the internal combustion engine load increases, it can lead to misfires, stalling, and other malfunctions. In order to solve the above technical problems, it is urgent to reasonably control the EGR process to overcome these issues. Summary of the Invention

[0004] This invention discloses an exhaust gas recirculation control method, including a pre-acquisition step and a first adjustment step; the pre-acquisition step acquires a discrimination temperature sequence of a preset observation position sequence along the exhaust gas recirculation channel; the observation position sequence includes the first outlet side of the exhaust gas recirculation cooler, the second inlet side of the exhaust gas recirculation compressor, and the third outlet side of the engine intake mid-section cooler; the discrimination temperature sequence includes ambient temperature, intake temperature, and intercooler temperature.

[0005] Furthermore, by comparing at least one temperature value in the above-mentioned discrimination temperature sequence with the magnitude of the calibration parameter, and selecting an intervention method based on the comparison result; if there is a risk of condensation according to the preset rules, the intervention process of its first adjustment step is triggered.

[0006] Specifically, its first adjustment step increases the intake air temperature or intercooler temperature by reducing the intensity of the medium circulation in the engine's first cooling passage (usually the large circulation system of the engine cooling unit) and / or by adopting preset intervention measures; its calibration parameters include dew point temperature, and its preset rules include a target temperature sequence calculated according to the dew point temperature; its target temperature sequence is the target value, correction value and / or theoretical value that the temperature sequence needs to achieve; wherein the intercooler temperature is the temperature at a preset position of the intake intercooler.

[0007] The engine's first cooling passage includes a liquid cooling circulation passage and / or a gas cooling circulation passage. Its first adjustment step can increase the intake air temperature or intercooler temperature by reducing the output power of the first cooling passage's circulation power unit. Specifically, this circulation power unit can be a water pump; its liquid cooling circulation passage can use water and / or a solution, colloid, or fluid mixture of water and a preset substance as the heat exchange medium; its exhaust gas circulation passage draws exhaust gas from the engine exhaust passage to the engine intake end, i.e., the exhaust gas circulation process; its exhaust gas circulation passage can perform heat exchange through an exhaust gas circulation cooler to improve parameters such as intake air temperature, humidity, or density.

[0008] Furthermore, the exhaust gas recirculation control method disclosed in this invention may also include a second adjustment step; the second adjustment step may introduce a heat exchange process / medium into the engine's second cooling channel via a three-way valve and / or a proportional valve to increase the intake air temperature or the aforementioned intercooler temperature.

[0009] In addition, the exhaust gas recirculation control method may further include a third adjustment step; the third adjustment step reduces the opening of the exhaust gas recirculation valve and makes the opening of the exhaust gas recirculation valve less than a preset exhaust gas valve threshold.

[0010] If the intake air temperature or intercooler temperature is greater than the dew point temperature when the first and / or second adjustment steps are completed, the execution of the third adjustment step can be prohibited. That is, a simpler process is preferred, which also avoids excessive interference with the exhaust gas recirculation process and ensures the ventilation volume and efficiency of the exhaust gas recirculation.

[0011] Furthermore, its pre-acquisition step can achieve closed-loop control of intake air temperature or intercooler temperature by detecting intake air temperature or intercooler temperature; that is, the first adjustment step, the second adjustment step and / or the third adjustment step of the closed loop are used to call the corresponding interference process of the actuator's drive step or execution step.

[0012] Specifically, its driving and execution steps can, according to the requirements of closed-loop control, change the adjustment error between the intake air temperature or intercooler temperature and the temperature control target value in a direction of reduction through the first adjustment step, the second adjustment step and / or the third adjustment step, or make the above adjustment error less than or equal to a preset error threshold.

[0013] The pre-acquisition step can obtain the judgment basis by detecting the real-time data of the flow meter and / or humidity sensor. If there is a risk of condensation according to the above-mentioned preset rules, the intervention process of at least one of the first adjustment step, the second adjustment step and / or the third adjustment step can be initiated. In addition, the pre-acquisition step can also correct its calibration parameters and / or preset rules according to the ambient temperature.

[0014] Accordingly, this invention also discloses a thermal management device, including a pre-acquisition unit and a first adjustment unit; the pre-acquisition unit acquires a discrimination temperature sequence of a preset observation position sequence along the exhaust gas recirculation channel; wherein, the observation position sequence includes the first outlet side of the exhaust gas recirculation cooler, the second inlet side of the exhaust gas recirculation compressor, and the third outlet side of the engine intake mid-section cooler; the discrimination temperature sequence includes ambient temperature, intake temperature, and intercooler temperature.

[0015] Furthermore, by comparing at least one temperature value in its discrimination temperature sequence with the magnitude of the calibration parameter, and selecting its intervention method based on the comparison result; if there is a risk of condensation according to the preset rules, the intervention process of its first regulation unit is triggered.

[0016] Specifically, its first adjustment unit can reduce the intensity of the medium circulation in the engine's first cooling channel and / or adopt preset intervention measures to increase the intake air temperature or intercooler temperature; the calibration parameter includes the dew point temperature, and the preset rule includes the target temperature sequence calculated according to the dew point temperature; the target temperature sequence is the target value, correction value and / or theoretical value that the above-mentioned discrimination temperature sequence needs to achieve; and the intercooler temperature is the temperature at the preset position of the intake intercooler.

[0017] The first cooling channel includes a liquid cooling circulation channel and / or a gas cooling circulation channel. The first adjustment step reduces the output power of the first cooling channel circulation power unit to increase the intake air temperature or intercooler temperature. The circulation power unit includes a water pump. The liquid cooling circulation channel uses water and / or a solution, colloid, or fluid mixture of water and a preset substance as the heat exchange medium. The exhaust gas circulation channel draws exhaust gas from the engine exhaust passage to the engine intake end. The exhaust gas circulation channel exchanges heat through an exhaust gas circulation cooler.

[0018] Furthermore, the thermal management device may also include a second regulating unit; this second regulating unit can introduce a heat exchange process / medium into the engine's second cooling passage via a three-way valve and / or a proportional valve to increase the intake air temperature or intercooler temperature; wherein, the engine's second cooling passage can be a small cooling loop, i.e., a circulation path that does not pass through the coolant tank. Furthermore, the thermal management device may also include a third regulating unit; this third regulating unit reduces the exhaust gas recirculation valve and makes its opening less than a preset exhaust gas valve threshold; wherein, if the intake air temperature or intercooler temperature is greater than the dew point temperature when the first regulating unit and / or the second regulating unit is activated, the activation of the third regulating unit can be prohibited, thereby saving the introduction of actuators and reducing the consumption of system component resources.

[0019] In addition, its front-end acquisition unit can detect the intake air temperature or intercooler temperature and realize closed-loop control of the intake air temperature or intercooler temperature; specifically, the closed-loop control uses a first adjustment unit, a second adjustment unit and / or a third adjustment unit as the actuator; the actuator, according to the requirements of the closed-loop control, uses the first adjustment unit, the second adjustment unit and / or the third adjustment unit to change the adjustment error between the intake air temperature or intercooler temperature and the temperature control target value in a direction of reduction or to make the adjustment error less than or equal to a preset error threshold.

[0020] On the other hand, its front-end acquisition unit can also achieve closed-loop control by detecting real-time data from flow meters and / or humidity sensors; if there is a risk of condensation according to the above-mentioned preset rules, at least one of the first adjustment unit, the second adjustment unit and / or the third adjustment unit can still be activated to eliminate the risk of condensation; the front-end acquisition unit can also correct the calibration parameters and / or preset rules according to the ambient temperature to adapt to different scenarios or response speed requirements.

[0021] Similarly, embodiments of the present invention also disclose a computer storage medium and a controller; the computer storage medium includes a storage medium body for storing a computer program; when the computer program is executed by a microprocessor, it can implement any of the above-mentioned exhaust gas recirculation control methods; the controller also includes any of the above-mentioned thermal management devices and / or computer storage media; its structure and implementation process will not be described in detail.

[0022] In summary, this invention predicts the condensation risk of the engine exhaust gas recirculation (EGR) structure based on the discrimination temperature sequence obtained in the pre-acquisition step, and uses a preset three-stage linkage process—the first adjustment step, the second adjustment step, and the third adjustment step—to avoid the hazards of condensation. Furthermore, by introducing closed-loop control, it further improves the response speed and adjustment accuracy of the exhaust gas recirculation based on dew point temperature, thereby improving the heat exchange efficiency of the EGR system. Its technical solution can be improved and upgraded in products such as engine management systems (EMS), thermal management devices, and vehicle controllers. While improving exhaust emissions and reducing fuel consumption, it avoids the risks of misfire and stalling caused by exhaust gas condensation under varying load conditions.

[0023] It should be noted that the terms "first," "second," and similar terms used in this article are merely for describing the constituent elements of the technical solution and do not constitute a limitation on the technical solution, nor should they be interpreted as an indication or implication of the importance of the corresponding elements; elements with terms such as "first," "second," or similar terms indicate that at least one of the elements is included in the corresponding technical solution. Attached Figure Description

[0024] To more clearly illustrate the technical solution of the present invention and facilitate a further understanding of its technical effects, features, and objectives, the present invention will be described in detail below with reference to the accompanying drawings. The drawings constitute an essential part of the specification and are used together with Embodiment 1 of the present invention to illustrate the technical solution of the present invention, but do not constitute a limitation on the present invention.

[0025] The same reference numerals in the attached diagrams represent the same parts, specifically: Figure 1 This is a schematic diagram of the system structure of an embodiment of the waste gas recirculation device of the present invention.

[0026] Figure 2 This is a schematic diagram of the composition and structure of an embodiment of the waste gas recirculation device of the present invention. Figure 1 .

[0027] Figure 3 Examples of operational comparison data between the product embodiments of the present invention and related products are provided.

[0028] Figure 4 Examples of images illustrating condensation phenomena in related technologies are provided.

[0029] Figure 5 Examples of product images are provided for the improved technical solution of this invention.

[0030] Figure 6 This is a schematic diagram of the process of an embodiment of the method of the present invention.

[0031] Figure 7 This is a schematic diagram of the composition and structure of an embodiment of the waste gas recirculation device of the present invention. Figure 2 .

[0032] Figure 8 This is a schematic diagram of the composition structure of an embodiment of the product of the present invention. Figure 1 .

[0033] Figure 9 This is a schematic diagram of the composition structure of an embodiment of the product of the present invention. Figure 2 .

[0034] Figure 10 This is a schematic diagram of the composition structure of an embodiment of the product of the present invention. Figure 3 .

[0035] in: 001 - The first outlet side, i.e., downstream of the exhaust gas recirculation cooler; 002 - The second inlet side, i.e., the exhaust gas recirculation mixing point, which is also upstream of the compressor; 003 - The third outlet side, i.e., downstream of the intake intercooler; 009 - Exhaust Gas Recirculation (EGR) status; 010-HFM flow meter with humidity sensor; 020-EGR mixing valve; 022 - Exhaust gas recirculation compressor, also known as C (Compressor) compressor; 030-D (Dump) unloading valve; 033 - Intake intercooler, also known as I (Intercooler); 040 - Pressure booster sensor; 050 - Throttle body; 060 - Manifold pressure sensor; 066 - Engine; 070 - Exhaust gas recirculation valve; 077-EGR differential pressure sensor; 080-EGR valve upstream temperature sensor; 081 - First Exit Side; 088 - Exhaust Gas Recirculation Cooler, also known as EGRC (EGR Cooler); 090-T (Turbine) Turbine; 099 - Pre-collection steps; 100 - First adjustment step; 200 - Second adjustment step; 300 - Third adjustment step; 333 - Exhaust gas recirculation channel; 369 - Discriminant temperature sequence; 600 - Thermal Management Device; 601 - Front-end acquisition unit; 610 - First Adjustment Unit; 620 - Second Adjustment Unit; 630 - Third Adjustment Unit; 900 - Vehicles; 901 - Controller; 903 - Computer storage media; 909 - Example photo of condensation phenomenon; 919 - Improved product photo.

[0036] Example Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described below are merely illustrative of the technical solutions of the present invention, and not intended to limit the invention. Furthermore, the parts described in the embodiments or drawings are merely illustrative examples of relevant parts of the present invention, and not the entirety of the invention.

[0038] like Figure 6The exhaust gas recirculation control method shown includes a pre-acquisition step 099 and a first adjustment step 100; the pre-acquisition step 099 acquires data such as... Figure 1 The temperature discrimination sequence 369 is a preset observation position sequence along the exhaust gas recirculation channel 333 shown; the observation position sequence includes the first outlet side 001 of the exhaust gas recirculation cooler 088, the second inlet side 002 of the exhaust gas recirculation compressor 022, and the third outlet side 003 of the engine 066 intake intercooler 033; the temperature discrimination sequence 369 includes ambient temperature, intake temperature, and intercooler temperature.

[0039] Furthermore, at least one temperature value in the temperature sequence 369 is compared with the magnitude of the calibration parameter, and an intervention method is selected based on the comparison result. If there is a risk of condensation according to the preset rules, the intervention process of the first adjustment step 100 is triggered.

[0040] Specifically, its first adjustment step 100 may reduce the intensity of the medium circulation in the first cooling channel of engine 066 and / or adopt preset intervention measures to increase the intake air temperature or intercooler temperature; its calibration parameters include dew point temperature, and its preset rules include a target temperature sequence calculated according to the dew point temperature; its target temperature sequence is the target value, correction value and / or theoretical value that the temperature sequence 369 needs to achieve; wherein the intercooler temperature is the temperature at the preset position of the intake intercooler 033.

[0041] The first cooling channel includes a liquid cooling circulation channel and / or a gas cooling circulation channel, and its first adjustment step 100 reduces the output power of the first cooling channel circulation power unit, i.e., the water pump, to increase the intake air temperature or intercooling temperature.

[0042] Specifically, as described above, the circulating power unit includes a water pump; its liquid cooling circulation channel can use water and / or a solution, colloid, or fluid mixture of water and a preset substance as a heat exchange medium; its exhaust gas circulation channel 333 leads exhaust gas from the exhaust channel of engine 066 to the intake end of engine 066; the exhaust gas circulation channel 333 performs heat exchange through the exhaust gas circulation cooler 088.

[0043] Furthermore, the exhaust gas recirculation control method also includes a second adjustment step 200, which is introduced into the heat exchange process / medium of the engine 066 second cooling channel, i.e., the cooling small circulation system, via a three-way valve and / or a proportional valve to increase the intake air temperature or intercooler temperature.

[0044] Furthermore, the exhaust gas recirculation control method also includes a third adjustment step 300; the third adjustment step 300 reduces the exhaust gas recirculation valve 070 and makes the opening degree of the exhaust gas recirculation valve 070 less than a preset exhaust gas valve threshold.

[0045] Specifically, if the intake temperature or intercooler temperature is greater than the dew point temperature when the first adjustment step 100 and / or the second adjustment step 200 are completed, the execution of the third adjustment step 300 intervention process is prohibited.

[0046] Specifically, its pre-acquisition step 099 detects the intake air temperature or intercooler temperature and performs closed-loop control on the intake air temperature or intercooler temperature, thereby making the closed-loop control use the first adjustment step 100, the second adjustment step 200 and / or the third adjustment step 300 as the driving steps or execution steps of the actuator.

[0047] The driving and execution steps, according to the requirements of closed-loop control, use the first adjustment step 100, the second adjustment step 200, and / or the third adjustment step 300 to change the adjustment error between the intake air temperature or intercooler temperature and the temperature control target value in a direction of reduction, or to make the adjustment error less than or equal to a preset error threshold.

[0048] Specifically, after the pre-acquisition step 099 detects the real-time data of the flow meter and / or humidity sensor 010, if there is a risk of condensation according to the preset rules, the intervention process of at least one of the first adjustment step 100, the second adjustment step 200 and / or the third adjustment step 300 is initiated; the pre-acquisition step 099 also corrects the calibration parameters and / or preset rules according to the ambient temperature.

[0049] In addition, such as Figure 2 , Figure 7 The thermal management device 600 shown includes a front-end acquisition unit 601 and a first adjustment unit 610; its front-end acquisition unit 601 acquires data such as... Figure 1 The temperature sequence 369 of the preset observation position sequence along the exhaust gas recirculation channel 333 includes the first outlet side 001 of the exhaust gas recirculation cooler 088, the second inlet side 002 of the exhaust gas recirculation compressor 022, and the third outlet side 003 of the engine 066 intake intercooler 033; the temperature sequence 369 includes the ambient temperature, intake temperature, and intercooler temperature.

[0050] Specifically, at least one temperature value in the temperature sequence 369 is compared with the magnitude of the calibration parameter, and an intervention method is selected based on the comparison result. If there is a risk of condensation according to the preset rules, the intervention process of the first adjustment unit 610 is triggered. The first adjustment unit 610 reduces the intensity of the medium circulation in the first cooling channel of the engine 066 and / or adopts preset intervention measures to increase the intake air temperature or intercooler temperature.

[0051] The calibration parameters include dew point temperature, and the preset rules include the target temperature sequence calculated based on the dew point temperature; the target temperature sequence is the target value, correction value and / or theoretical value that the discrimination temperature sequence 369 needs to achieve; the intercooling temperature is the temperature at the preset position of the intake intercooler 033.

[0052] Specifically, its first cooling channel includes a liquid cooling circulation channel and / or a gas cooling circulation channel, and its first adjustment step 100 reduces the output power of the first cooling channel circulation power unit to increase the intake air temperature or intercooler temperature; wherein, the circulation power unit is a cooling circulation water pump; its liquid cooling circulation channel uses water and / or water coolant as the heat exchange medium; its exhaust gas circulation channel 333 leads the exhaust gas from the engine 066 exhaust channel to the engine 066 intake end; the exhaust gas circulation channel 333 performs heat exchange through the exhaust gas circulation cooler 088.

[0053] Furthermore, the thermal management device 600 also includes a second regulating unit 620; the second regulating unit 620 introduces a heat exchange process / medium into the second cooling passage of the engine 066 via a three-way valve and / or a proportional valve to increase the intake air temperature or intercooler temperature.

[0054] Furthermore, the thermal management device 600 also includes a third regulating unit 630; the third regulating unit 630 reduces the exhaust gas recirculation valve 070 and makes the opening degree of the exhaust gas recirculation valve 070 less than a preset exhaust gas valve threshold; wherein, if the intake air temperature or intercooler temperature is greater than the dew point temperature when the first regulating unit 610 and / or the second regulating unit 620 are started, the third regulating unit 630 can be prevented from starting.

[0055] The pre-acquisition unit 601 detects the intake air temperature or intercooler temperature and performs closed-loop control on the intake air temperature or intercooler temperature. The closed-loop control uses the first adjustment unit 610, the second adjustment unit 620 and / or the third adjustment unit 630 as actuators. According to the requirements of the closed-loop control, the actuators use the first adjustment unit 610, the second adjustment unit 620 and / or the third adjustment unit 630 to change the adjustment error between the intake air temperature or intercooler temperature and the temperature control target value in a way that reduces the error or makes the adjustment error less than or equal to a preset error threshold.

[0056] Furthermore, its pre-acquisition unit 601 can detect real-time data from the flow meter and / or humidity sensor 010. If there is a risk of condensation according to the above-mentioned preset rules, at least one of the first adjustment unit 610, the second adjustment unit 620 and / or the third adjustment unit 630 will be activated. Its pre-acquisition unit 601 can also correct the calibration parameters and / or preset rules according to the ambient temperature.

[0057] In practical applications, considering fuel consumption as a core indicator, EGR structure has become a common configuration for fuel vehicles and hybrid vehicles as an effective fuel-saving method. During the operation of the engine 066, especially during the warm-up process, the exhaust often contains a large amount of water vapor, which is carried back to the cylinder through the exhaust gas recirculation valve 070. In order to further improve the engine's power and reduce the tendency of knocking, this embodiment of the invention improves the impact of the intake water cooling system on EGR.

[0058] like Figure 1 As shown, in this embodiment of the invention, humidity sensors, transparent tubes or endoscopes are respectively installed at the first outlet side 001 downstream of the exhaust gas recirculation cooler, the second inlet side 002 (i.e., upstream of the compressor) at the exhaust gas recirculation mixing point, and the third outlet side 003 downstream of the intake intercooler. Tests have shown that condensate is mainly generated downstream of the intake intercooler, i.e., at the first outlet side 001. Therefore, when the liquid water accumulated in the above areas enters the cylinder, it may cause the vehicle to misfire or even stall.

[0059] After the improvement, the embodiment of the present invention can ensure that the temperature of the intake mid-section cooler 033 is controlled above the dew point temperature, while the intercooler water cooler uses fins and intake air temperature to directly exchange heat; therefore, an effective closed loop can be achieved by actively raising the intake air temperature.

[0060] Furthermore, in order to improve the response speed of intake air temperature control, the heat exchange process is intervened through the linkage of water pump, three-way valve and exhaust gas recirculation valve 070; the intervention process can be introduced in stages and layers according to the gas saturation level, thereby achieving rapid and progressive control; its products, such as thermal management device 600, can ensure that the intake air temperature is quickly and accurately controlled at the target temperature.

[0061] Specifically, dew point temperature can be optimized through EMS or other controllers, thereby improving control accuracy; this may also include a dew point temperature correction process, and its system composition structure is as follows: Figure 2 As shown; among them, by using information such as ambient temperature, intake air temperature, and dew point temperature, it can be determined whether to enter the condensation intervention process; if a condensation risk is identified, the water circuit temperature can be increased by first reducing the water pump output; subsequently, if the risk trend still exists, the intake air temperature can be further increased by bypassing the small circulation water circuit of engine 066 through the three-way valve; if the risk trend is still not suppressed, condensation can be further prevented by significantly limiting the opening of the exhaust gas recirculation valve 070.

[0062] like Figure 3 As shown, the test results for two operating conditions are compared. Through monitoring of the test data, it is demonstrated that after adopting the method and product of this invention, the 066 engine no longer experiences vibrations caused by misfires, and the entire vehicle operates stably and in good condition. Specifically, as... Figure 4 , Figure 5 Photos of the intake piping before and after the improvement are provided. Figure 4 These are comparative photos showing the surface without the present invention, where water droplets are visible to the naked eye. If these water droplets were sucked into engine 066, it could potentially cause engine misfire, vibration, or even stalling. However, in contrast, [the following text appears to be unrelated and possibly a separate excerpt:] ... Figure 5 The improved group shown has a dry intake manifold with no water droplets, which helps ensure reliable engine operation.

[0063] In fact, the linkage process of the above-mentioned water pump, three-way valve and exhaust gas recirculation valve can be optimized according to the saturation level of the exhaust gas to reduce the impact of the intervention process on the EGR structure or process and help reduce the control difficulty. In addition, its alternative design also includes eliminating one or two actuators, such as replacing the three-way valve with a proportional valve, or changing the intake temperature control to intercooled water temperature control.

[0064] Similarly, such as Figure 8-10 Also disclosed is a computer storage medium 903, including a storage medium body for storing a computer program; when executed by a microprocessor, the computer program can implement any of the exhaust gas recirculation control methods described above; such as Figure 8-10 The controller 901 includes any of the thermal management devices 600 and / or computer storage media 903 as described above, and its intervention process for the EGR system is similar and will not be described again.

[0065] It should be noted that the above embodiments are only for more clearly illustrating the technical solution of the present invention. Those skilled in the art will understand that the implementation of the present invention is not limited to the above content. Any obvious changes, substitutions or replacements made based on the above content do not exceed the scope of the technical solution of the present invention. Other implementations will also fall within the scope of the present invention without departing from the concept of the present invention.

Claims

1. A method for controlling waste gas recirculation, characterized in that... The process includes a pre-acquisition step (099) and a first adjustment step (100). The pre-acquisition step (099) acquires a discrimination temperature sequence (369) of a preset observation position sequence along the exhaust gas recirculation channel (333). The observation position sequence includes the first outlet side (001) of the exhaust gas recirculation cooler (088), the second inlet side (002) of the exhaust gas recirculation compressor (022), and the third outlet side (003) of the engine (066) intake intercooler (033). The discrimination temperature sequence (369) includes ambient temperature, intake temperature, and intercooler temperature. The system compares at least one temperature value in the discrimination temperature sequence (369) with the calibration parameter and adjusts accordingly. The intervention method is selected based on the comparison results. If there is a risk of condensation according to the preset rules, the intervention process of the first adjustment step (100) is triggered. The first adjustment step (100) reduces the intensity of the medium circulation in the first cooling channel of the engine (066) and / or adopts preset intervention measures to increase the intake temperature or the intercooler temperature. The calibration parameters include the dew point temperature, and the preset rules include the target temperature sequence calculated according to the dew point temperature. The target temperature sequence is the target value, correction value and / or theoretical value that the discrimination temperature sequence (369) needs to achieve. The intercooler temperature is the temperature at the preset position of the intake mid-section cooler (033).

2. The waste gas recirculation control method as described in claim 1, wherein: The first cooling channel includes a liquid cooling circulation channel and / or a gas cooling circulation channel. The first adjustment step (100) reduces the output power of the first cooling channel circulation power unit to increase the intake air temperature or the intercooling temperature.

3. The waste gas recirculation control method as described in claim 2, wherein: The first cooling channel circulation power device includes a water pump; the liquid cooling circulation channel uses water and / or a solution, colloid, or fluid mixture of water and a preset substance as the heat exchange medium; the exhaust gas circulation channel (333) leads the exhaust gas from the exhaust channel of the engine (066) to the intake end of the engine (066); the exhaust gas circulation channel (333) performs heat exchange through the exhaust gas circulation cooler (088).

4. The exhaust gas recirculation control method according to any one of claims 1, 2 or 3, further comprising a second adjustment step (200); the second adjustment step (200) introduces a heat exchange process / medium into the second cooling passage of the engine (066) via a three-way valve and / or a proportional valve to increase the intake air temperature or the intercooler temperature.

5. The exhaust gas recirculation control method as described in claim 4 further includes a third adjustment step (300); the third adjustment step (300) reduces the exhaust gas recirculation valve (070) and makes the opening degree of the exhaust gas recirculation valve (070) less than a preset exhaust gas valve threshold.

6. The waste gas recirculation control method as described in claim 5, wherein: If the intake temperature or the intercooler temperature is greater than the dew point temperature when the first adjustment step (100) and / or the second adjustment step (200) is completed, the execution of the third adjustment step (300) intervention process is prohibited.

7. The exhaust gas recirculation control method as described in any one of claims 5 or 6, wherein, The pre-acquisition step (099) detects the intake air temperature or the intercooler temperature and performs closed-loop control on the intake air temperature or the intercooler temperature, thereby making the closed-loop control use the first adjustment step (100), the second adjustment step (200) and / or the third adjustment step (300) as the driving step or execution step of the actuator; the driving step and the execution step, according to the requirements of the closed-loop control, use the first adjustment step (100), the second adjustment step (200) and / or the third adjustment step (300) to change the adjustment error between the intake air temperature or the intercooler temperature and the temperature control target value in a direction of reduction or to make the adjustment error less than or equal to a preset error threshold.

8. The waste gas recirculation control method as described in claim 7, wherein: The pre-acquisition step (099) detects real-time data from the flow meter and / or humidity sensor (010). If there is a risk of condensation according to the preset rule, an intervention process is initiated by at least one of the first adjustment step (100), the second adjustment step (200), and / or the third adjustment step (300). The pre-acquisition step (099) also corrects the calibration parameters and / or the preset rule according to the ambient temperature.

9. A thermal management device (600), comprising a pre-acquisition unit (601) and a first adjustment unit (610); wherein the pre-acquisition unit (601) acquires a discrimination temperature sequence (369) of a preset observation position sequence along the exhaust gas circulation channel (333); wherein, The observation location sequence includes the first outlet side (001) of the exhaust gas recirculation cooler (088), the second inlet side (002) of the exhaust gas recirculation compressor (022), and the third outlet side (003) of the engine (066) intake intercooler (033); the discrimination temperature sequence (369) includes ambient temperature, intake temperature, and intercooler temperature; at least one temperature value in the discrimination temperature sequence (369) is compared with the magnitude of the calibration parameter, and an intervention method is selected according to the comparison result. If there is a risk of condensation according to the preset rules, the first adjustment order is triggered. The intervention process of the first regulating unit (610); the first regulating unit (610) reduces the intensity of the medium circulation in the first cooling channel of the engine (066) and / or adopts preset intervention measures to increase the intake temperature or the intercooler temperature; the calibration parameters include dew point temperature, and the preset rules include a target temperature sequence calculated according to the dew point temperature; the target temperature sequence is the target value, correction value and / or theoretical value that the discrimination temperature sequence (369) needs to achieve; the intercooler temperature is the temperature at the preset position of the intake intercooler (033).

10. The thermal management device (600) as claimed in claim 9, wherein: The first cooling channel includes a liquid cooling circulation channel and / or a gas cooling circulation channel. The first regulating unit (610) reduces the output power of the first cooling channel circulation power device to increase the intake air temperature or the intercooling temperature. The first cooling channel circulation power device includes a water pump. The liquid cooling circulation channel uses water and / or a solution, colloid, or fluid mixture of water and a preset substance as the heat exchange medium. The exhaust gas circulation channel (333) draws exhaust gas from the exhaust channel of the engine (066) to the intake end of the engine (066). The exhaust gas circulation channel (333) performs heat exchange through the exhaust gas circulation cooler (088).

11. The thermal management device (600) of claim 9 or 10 further includes a second regulating unit (620); the second regulating unit (620) introduces a heat exchange process / medium into the second cooling passage of the engine (066) via a three-way valve and / or a proportional valve to increase the intake air temperature or the intercooler temperature.

12. The thermal management device (600) as claimed in claim 11 further includes a third regulating unit (630); the third regulating unit (630) reduces the exhaust gas recirculation valve (070) and makes the opening degree of the exhaust gas recirculation valve (070) less than a preset exhaust gas valve threshold; wherein, If the intake air temperature or the intercooler temperature is greater than the dew point temperature when the first regulating unit (610) and / or the second regulating unit (620) are started, then the third regulating unit (630) is prohibited from starting.

13. The thermal management device (600) as claimed in claim 12, wherein, The pre-acquisition unit (601) detects the intake air temperature or the intercooler temperature and performs closed-loop control on the intake air temperature or the intercooler temperature. The closed-loop control uses the first adjustment unit (610), the second adjustment unit (620) and / or the third adjustment unit (630) as actuators. According to the requirements of the closed-loop control, the actuators use the first adjustment unit (610), the second adjustment unit (620) and / or the third adjustment unit (630) to change the adjustment error between the intake air temperature or the intercooler temperature and the temperature control target value in a direction of reduction or to make the adjustment error less than or equal to a preset error threshold.

14. The thermal management device (600) as claimed in claim 13, wherein: The pre-acquisition unit (601) detects real-time data from the flow meter and / or humidity sensor (010). If there is a risk of condensation according to the preset rules, at least one of the first adjustment unit (610), the second adjustment unit (620), and / or the third adjustment unit (630) is activated. The pre-acquisition unit (601) also corrects the calibration parameters and / or the preset rules according to the ambient temperature.

15. A computer storage medium (903) comprising a storage medium body for storing a computer program; wherein the computer program, when executed by a microprocessor, implements the exhaust gas recirculation control method as described in any one of claims 1 to 8.

16. A controller (901) comprising the thermal management device (600) of any one of claims 9 to 14 and / or the computer storage medium (903) of claim 15.

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