Exhaust gas circulation control method, intercooling device, storage medium and controller

Abstract

The invention belongs to the technical field of internal combustion engines, and particularly relates to a waste gas circulation control method, an intercooling device, a storage medium and a controller. The first signal acquisition step / unit acquires the dew point temperature (010) T1 and the air inlet temperature (020) T2 of the internal combustion engine (999); the second delay intervention step / unit schedules the output power, the valve state and / or the output state of the execution mechanism according to a preset intervention condition, and adopts a delay means to increase the system inertia; a third abnormality handling step / unit and a fourth parameter calibration step / unit improve the completeness and flexibility of intercooling control; according to the product and the method, under the background of low pressure exhaust gas recirculation (LP)-EGR (Low Pressure-Exhaust Gas Recirculation) and intercooling system coupling and the like, an air inlet condensation control scheme of an internal combustion engine (999) can be optimized, frequent start and stop of an execution mechanism are prevented, and parameters can be improved through calibration of temperature and a delay threshold value; the risk of condensation fire is avoided, and meanwhile, the number of working condition points where EGR, LP-EGR and other schemes can be started is effectively increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of internal combustion engines, and in particular relates to an exhaust gas circulation control method, an intercooler, a storage medium and a controller. Background Art

[0002] Exhaust gas recirculation (EGR) technology or low-pressure exhaust gas recirculation (LP-EGR) technology is used to control the emission of harmful substances such as nitrogen oxides by internal combustion engines; however, in order to control the intake air temperature, the following are introduced in the intake link: Figure 1 An intercooler structure (system) 700 is shown.

[0003] On the one hand, high-temperature exhaust gas needs to be mixed with fresh air and cooled in the intercooler structure (system); on the other hand, in order to prevent condensation of the cooled mixture and even abnormal ignition of the internal combustion engine, it is also necessary to intervene in the temperature and pressure of the mixture.

[0004] like Figure 1 As shown, if the actuator in the intercooler structure (system) 700 is frequently actuated, it will threaten the service life of related components; Figure 2 As shown, when the relevant technical solution is used, the intake air temperature 010 fluctuates around the dew point temperature 020; when the actuator's operating frequency or the fluctuation amplitude and frequency of the intake air temperature 010 exceed a certain limit, it will affect the reliable and stable operation of the internal combustion engine; among them, if the risk is avoided by reducing the use rate of EGR or avoiding the intervention of EGR at certain operating points, it will make it difficult for EGR to function efficiently.

[0005] In addition, unlike the applicant's related technology for EGR control in transient processes such as warm-up (patent publication number CN117329032A), the above phenomenon still exists when the internal combustion engine is in a steady-state output condition or when the vehicle or other equipment where the internal combustion engine is located is in a steady-state output condition; therefore, in order to give full play to the positive role of EGR or LP-EGR, it is urgent to improve the design to ensure the reliable and efficient operation of related components during the steady-state working stage of the internal combustion engine. Summary of the invention

[0006] An embodiment of the present invention discloses an exhaust gas circulation control method for intercooling control under steady-state conditions of an internal combustion engine; its core process includes a first signal acquisition step and a second delayed intervention step; wherein the first signal acquisition step obtains the dew point temperature T1 and the intake temperature T2 of a preset area of ​​the internal combustion engine; the second delayed intervention step maintains the output power, valve state and / or preset output state of the first group of actuators unchanged under preset conditions until a preset first intervention condition is met; the first intervention condition indicates that the intake temperature T2 is less than a first decision temperature, and the first decision temperature is equal to the difference between the dew point temperature T1 and the first deviation temperature a.

[0007] Among them, if the first intervention condition is met, the first intervention process is implemented on the intercooler water pump and / or the first group of actuators, and the first intervention process includes reducing the output power of the intercooler water pump and / or executing a preset first intervention measure; the first intervention measure increases the intake air temperature T2.

[0008] Specifically, if the opening of the intercooler water pump reaches the first lower limit value and maintains a preset second lag time, and the second lag time is greater than or equal to 0, the second intervention process is executed; the second intervention process takes preset heating measures; the heating measures include taking insulation measures, performing electric heating and / or reducing heat loss in the above-mentioned preset area.

[0009] Furthermore, if the intake air temperature T2 is greater than the second decision temperature after the second intervention process is adopted, the third intervention process is executed; the third intervention process includes stopping the implementation of heating measures; if the opening of the intercooler water pump does not reach the first lower limit value, the opening of the intercooler water pump is reduced until it reaches the first lower limit value.

[0010] Specifically, if the intake air temperature T2 is lower than the third decision temperature, the first intervention process is resumed; otherwise, the second intervention process and / or the third intervention process are prohibited; wherein: the first group of actuators includes a three-way valve, an intercooler water pump, a heat exchanger and / or a supercharger.

[0011] In addition, the first deviation temperature is greater than or equal to 0, the second decision temperature is equal to the sum of the dew point temperature T1 and the second deviation temperature b, and the second deviation temperature is greater than 0; the third decision temperature is equal to the difference between the dew point temperature T1 and the third deviation temperature c, and the third deviation temperature is also greater than or equal to 0.

[0012] Furthermore, the exhaust gas circulation control method may also be provided with a third abnormal handling step; if the opening of the intercooler water pump reaches the first lower limit value and the intake temperature T2 is greater than the fourth decision temperature, then exit the first intervention process, the second intervention process, the third intervention process and / or increase the output power of the intercooler pump; the fourth decision temperature is equal to the sum of the dew point temperature T1 and the fourth deviation temperature; the fourth deviation temperature is greater than zero and the fourth absolute value of the fourth deviation temperature is greater than a preset fourth safety threshold; the fourth safety threshold needs to be large enough to represent a relatively rare or abnormal temperature rise scenario.

[0013] Furthermore, the exhaust gas circulation control method may also be provided with a fourth parameter calibration step; the overshoot of the intake temperature T2 and / or the fourth duty cycle of the first group of actuators may be calibrated according to the ambient temperature, the first allowable range of the intake temperature T2, and the second allowable range of the difference between the intake temperature T2 and the dew point temperature T1, and the fourth duty cycle represents the ratio of the fourth opening time of the above-mentioned first group of actuators to the fourth waiting time in the driving cycle.

[0014] Specifically, the fourth parameter calibration step can further determine the coordination process of different actuators in the first group of actuators, decompose the coordination process into a heating process and a cooling process and set a preset number N priorities; the heating process will cause the intake temperature T2 to increase, while the cooling process will cause the intake temperature T2 to decrease, and N is a positive integer.

[0015] In addition, the first group of actuators may be limited to the intercooler water pump and the three-way valve to simplify the control scheme; wherein, during the execution of the first signal acquisition step, the second delay intervention step, the third abnormal handling step and / or the fourth parameter calibration step, the preset second group of actuators must be disabled; the second group of actuators are actuators or devices other than the above-mentioned first group of actuators.

[0016] Furthermore, if the ambient temperature is lower than 0 degrees, the vehicle 900 is in the first starting condition, the vehicle 900 is in a preset condition and / or the vehicle 900 is in a preset second dynamic condition, then the second delayed intervention step may be prohibited from intervening in the first group of actuators and / or the second group of actuators; before the first group of actuators are started in the second delayed intervention step, the third abnormal handling step and / or the fourth parameter calibration step, it will wait for the preset fifth delay time. If the preset intervention conditions are met after the fifth delay time is reached, the first group of actuators will be started; at this time, frequent actions or state transitions of the actuators can be further avoided.

[0017] Correspondingly, an embodiment of the present invention also discloses an intercooler device for an internal combustion engine, comprising a first signal acquisition unit and a second delayed intervention unit; the first signal acquisition unit obtains the dew point temperature T1 and the intake temperature T2 of a preset area of ​​the internal combustion engine; the second delayed intervention unit maintains the output power, valve state and / or preset output state of the first group of actuators unchanged under preset working conditions until a preset first intervention condition is met; the first intervention condition indicates that the intake temperature T2 is less than the first decision temperature, and the first decision temperature is equal to the difference between its dew point temperature T1 and the first deviation temperature a; if the first intervention condition is met, a first intervention process is implemented on the intercooler water pump and / or the first group of actuators, and the first intervention process includes reducing the output power of the cooling water pump and / or executing a preset first intervention measure; the first intervention measure can increase the intake temperature T2.

[0018] In addition, if the opening of the above-mentioned intercooler water pump reaches the first lower limit value and maintains a preset second lag time, and the second lag time is greater than or equal to 0, the second intervention process is executed; the second intervention process also takes preset heating measures; the heating measures include taking insulation measures, performing electric heating and / or reducing heat loss in a preset area; if after the second intervention process is adopted, the intake air temperature T2 is greater than the second decision temperature, the third intervention process is executed; the third intervention process includes stopping the execution of heating measures; if the opening of the intercooler water pump does not reach the first lower limit value, the opening of the intercooler water pump is reduced until it reaches the first lower limit value; if the intake air temperature T2 is less than the third decision temperature, the first intervention process is resumed; otherwise, the execution of the second intervention process and / or the third intervention process is prohibited; its first group of actuators includes a three-way valve, an intercooler water pump, a heat exchanger and / or a supercharger.

[0019] Furthermore, the internal combustion engine intercooler may also be provided with a third abnormal handling unit and / or a fourth parameter calibration step; if the opening of the cold water pump reaches its first lower limit value and the intake temperature T2 is greater than the fourth decision temperature, then the first intervention process, the second intervention process, the third intervention process and / or the output power of the cold water pump is exited; wherein, the fourth decision temperature is equal to the sum of the dew point temperature T1 and the fourth deviation temperature; the fourth deviation temperature is greater than zero and the fourth absolute value of the fourth deviation temperature is greater than the preset fourth safety threshold.

[0020] Among them, the overshoot of the intake temperature T2 and / or the fourth duty cycle of the first group of actuators can be calibrated according to the ambient temperature, the first allowable range of the intake temperature T2, and the second allowable range of the difference between the intake temperature T2 and the dew point temperature T1. The fourth duty cycle represents the ratio of the fourth opening time of the first group of actuators to the fourth waiting time in the driving cycle.

[0021] Specifically, its fourth parameter calibration unit can further determine the coordination process of different actuators in the first group of actuators, decompose the coordination process into a heating process and a cooling process and set a preset number N priorities; the heating process will cause the intake temperature T2 to increase, and the cooling process will cause the intake temperature T2 to decrease, and N is a positive integer.

[0022] Among them, if the first group of actuators is limited to the intercooler water pump and the three-way valve, and during the execution of the first signal acquisition unit, the second delay intervention unit, the third abnormal handling unit and / or the fourth parameter calibration unit, the preset second group of actuators can be disabled; the second group of actuators are actuators or equipment other than the first group of actuators; at this time, the configuration of the actuators will be greatly simplified.

[0023] Specifically, if the ambient temperature is below 0 degrees, the vehicle is in the first starting condition, the vehicle is in a preset condition and / or the vehicle is in a preset second dynamic condition, the second delay intervention unit may be prohibited from intervening in the first group of actuators and / or the second group of actuators; before the first group of actuators in the second delay intervention unit, the third abnormal handling unit and / or the fourth parameter calibration unit are started, they will wait for the preset fifth delay time. If the preset intervention conditions are met after the fifth delay time is reached, the first group of actuators will be started.

[0024] Correspondingly, an embodiment of the present invention also discloses 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, any of the above exhaust gas circulation control methods can be implemented; the controller also includes any of the above internal combustion engine intercooling devices and / or computer storage media to solve the same technical problems.

[0025] In summary, the first signal acquisition step / unit of the present invention obtains the dew point temperature T1 and the intake air temperature T2 of the internal combustion engine; the second delayed intervention step / unit schedules the output power, valve state and / or output state of the actuator according to the preset intervention conditions, and increases the system inertia by delay means; the third abnormal handling step / unit and the fourth parameter calibration step / unit improve the integrity and flexibility of the intercooler control; its products and methods can optimize the internal combustion engine intake condensation control scheme in the context of the coupling of the low-pressure exhaust gas circulation LP-EGR and the intercooler system, prevent the frequent start and stop of the actuator, and improve the parameters by calibrating the temperature and delay thresholds; while avoiding the risk of condensation fire, effectively increase the operating points at which the EGR, LP-EGR and other schemes can be turned on.

[0026] It should be noted that the terms "first", "second" and similar terms used in this article are only for describing the various components in the technical solution, and do not constitute a limitation of the technical solution, nor can they be understood as an indication or suggestion of the importance of the corresponding elements; elements with "first", "second" and similar terms indicate that the corresponding technical solution contains at least one of the element. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present invention and facilitate further understanding of the technical effects, technical features and purposes of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The accompanying drawings constitute an essential part of the specification and are used together with the embodiments of the present invention to illustrate the technical solution of the present invention, but do not constitute a limitation to the present invention.

[0028] The same reference numerals in the accompanying drawings represent the same components, and the details of each drawing are as follows.

[0029] Figure 1 The figure is a schematic diagram of an application scenario of an embodiment of the present invention.

[0030] Figure 2 The following are examples of the intercooler intake air temperature and dew point temperature data of the related technology.

[0031] Figure 3 It is the formula of Antoine.

[0032] Figure 4 Formula for relative humidity (%)φ.

[0033] Figure 5 Formula for moisture content d.

[0034] Figure 6 is the dew point temperature formula.

[0035] Figure 7 Schematic diagram of the working process of the water pump and the three-way valve according to an embodiment of the present invention.

[0036] Figure 8 Schematic diagram of the working sequence (optimization) of the water pump and the three-way valve according to an embodiment of the present invention.

[0037] Fig. 9 Schematic diagram of the first type of periodic deviation between intake air temperature and dew point temperature according to an embodiment of the present invention.

[0038] Fig.10 Schematic diagram of the second type of unidirectional convergence deviation between intake air temperature and dew point temperature in an embodiment of the present invention.

[0039] Fig.11 Schematic diagram of the third type of swing convergence deviation of intake air temperature and dew point temperature in an embodiment of the present invention.

[0040] Fig.12 The figure is a schematic diagram of a flow chart of an embodiment of the method of the present invention.

[0041] Fig.13 It is a schematic diagram of the structure of an internal combustion engine intercooler embodiment of the present invention.

[0042] Fig.14 Schematic diagram of the layout structure of the product embodiment of the present invention Figure 1 .

[0043] Fig.15 Schematic diagram of the layout structure of the product embodiment of the present invention Figure 2 .

[0044] Fig.16 Schematic diagram of the layout structure of the product embodiment of the present invention Figure 3 .

[0045] The meanings of the various reference numerals / numbers are as follows.

[0046] 001-Heat exchange medium container, such as kettle; 002-Intercooler water pump; 003-Intercooler; 004-Supercharger; 005-heat exchange pipeline (partial); 006-Heat exchangers, such as low-temperature radiators; 010-dew point temperature, T1 (℃); 020-intake air temperature, T2 (℃); 021-The first deviation amount; 022-second deviation; 023-third deviation; 024- fourth deviation; 031-Logarithmic relationship; 033-First physical property constant, A; 034- Second physical property constant, B; 035-the third physical property constant, C; 036- Saturated vapor pressure Ps (Saturated vapor Pressure) (unit: Pa or Pascal); 037-mmHg (millimeter Hydrargyrum); 040-Relative humidity (%); 041 - first humidity component; 042 - second humidity component; 043-third humidity component; 044- fourth humidity component; 050-Humidity Ratio (HR) 051-air pressure (Pa, Pascal); 052-second moisture content; 053-the third moisture content; 060-water pump opening; 061-opening (gradually) decrease interval; 062-The maximum time for setting the minimum opening; 063-opening (gradually) increase interval; 064-minimum opening, such as 17%; 070-Three-way valve (intervention) status; 071-power supply insulation status; 072-Disconnect cooling state; 077-Third Intervention Process; 088-Second intervention process; 099-First intervention process; 100-first signal acquisition step; 120-first lower limit; 200 - second delayed intervention step; 210-first intervention condition; 220-second intervention condition (similar to the first intervention condition); 222-output state unchanged (state); 230-third intervention condition (similar to the first intervention condition); 300-third abnormality handling step; 321-Warming measures; 400- fourth parameter calibration step; 600-Intercooler for internal combustion engines; 610-first signal acquisition unit; 620-Second Delayed Intervention Unit; 630-third abnormal handling unit; 640- fourth parameter calibration unit; 700-intercooling structure (system); 810-first switching moment; 820-second switching time; 830 - third switching moment; 900 - Vehicles or equipment to be driven; 901-controller; 903-Computer storage media; 910-three-way valve; 911-first end of three-way valve; 912- second end of three-way valve; 913-the third end of the three-way valve; 999 - Internal combustion engine. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described below are only for explaining the technical solutions of the present invention, rather than for limiting the present invention. In addition, the parts described in the embodiments or the accompanying drawings are only examples of the relevant parts of the present invention, rather than the whole of the present invention.

[0048] like Figure 7 , Fig.12 The exhaust gas circulation control method shown in the figure includes a first signal acquisition step 100 and a second delay intervention step 200; the first signal acquisition step 100 obtains the following Fig.15 Or the dew point temperature 010 and the intake temperature 020 of the preset area of ​​the internal combustion engine 999 shown in 16; and the second delayed intervention step 200 keeps the output power, valve state and / or preset output state of the first group of actuators unchanged under the preset operating conditions until the preset first intervention condition 210 is met; the first intervention condition 210 indicates that the intake temperature 020 is less than the first decision temperature, and the first decision temperature is equal to the difference between the dew point temperature 010 and the first deviation temperature 011.

[0049] If the first intervention condition 210 is satisfied, Figure 1 The intercooler water pump 002 and / or the first group of actuators shown implement a first intervention process 099, which includes reducing the output power of the intercooler water pump 002 and / or executing a preset first intervention measure; the first intervention measure can reduce the intake air temperature 020.

[0050] Furthermore, if the opening of the intercooler water pump 002 reaches the first lower limit value 120 and maintains a preset second lag time, and the second lag time is greater than or equal to 0, the second intervention process 088 is executed; the second intervention process 088 takes preset heating measures 321; the heating measures 321 include taking insulation measures, performing electric heating and / or reducing heat loss in a preset area.

[0051] Among them, if the intake temperature 020 is greater than the second decision temperature after adopting the second intervention process 088, the third intervention process 077 is executed; the third intervention process 077 includes stopping the execution of the heating measure 321; if the opening of the intercooler water pump 002 does not reach the first lower limit value 120, the opening of the intercooler water pump 002 is reduced until it reaches the first lower limit value 120.

[0052] Furthermore, if the intake air temperature 020 is less than the third decision temperature, the first intervention process 099 is resumed; otherwise, the execution of the second intervention process 088 and / or the third intervention process 077 is prohibited.

[0053] Specifically, Figure 1 As shown, the first group of actuators may be a three-way valve 910 , an intercooler water pump 002 , a heat exchanger 006 and / or a supercharger 004 .

[0054] Among them, the first deviation temperature 011 is greater than or equal to 0; the second decision temperature is equal to the sum of the dew point temperature 010 and the second deviation temperature 012, and the second deviation temperature 012 is greater than 0; the third decision temperature is equal to the difference between the dew point temperature 010 and the third deviation temperature 013, and the third deviation temperature 013 is greater than or equal to 0.

[0055] Furthermore, the exhaust gas circulation control method may also be provided with a third abnormal handling step 300; if the opening of the cold water pump 002 reaches the first lower limit value 120 and its intake temperature 020 is greater than the fourth decision temperature, then exit the first intervention process 099, the second intervention process 088, the third intervention process 077 and / or increase the output power of the cold water pump 002; the fourth decision temperature is equal to the sum of the dew point temperature 010 and the fourth deviation temperature 014; its fourth deviation temperature 014 is greater than zero and the fourth absolute value of the fourth deviation temperature 014 is greater than the preset fourth safety threshold.

[0056] Furthermore, the exhaust gas circulation control method may also be provided with a fourth parameter calibration step 400; the overshoot of the intake temperature 020 and / or the fourth duty cycle of the first group of actuators may be calibrated according to the ambient temperature, the first allowable range of the intake temperature 020, and the second allowable range of the difference between the intake temperature 020 and the dew point temperature 010, wherein the fourth duty cycle represents the ratio of the fourth opening time of the first group of actuators to the fourth waiting time in the driving cycle.

[0057] Among them, the fourth parameter calibration step 400 can further determine the coordination process of different actuators in the first group of actuators, and decompose the coordination process into a heating process and a cooling process, and set a preset number N of priorities for screening.

[0058] Specifically, its temperature rising process will cause the intake air temperature 020 to increase, and its temperature falling process will cause the intake air temperature 020 to decrease, and N is a positive integer.

[0059] Specifically, its first group of actuators may be limited to the intercooler water pump 002 and the three-way valve 910, and during the execution of the first signal acquisition step 100, the second delay intervention step 200, the third abnormal handling step 300 and / or the fourth parameter calibration step 400, the preset second group of actuators may be disabled; the second group of actuators are actuators or devices other than the first group of actuators.

[0060] Among them, if the ambient temperature is lower than 0 degrees, the vehicle 900 is in the first starting condition, the vehicle 900 is in the preset condition and / or the vehicle 900 is in the preset second dynamic condition, then the second delayed intervention step 200 may be prohibited from intervening in the first group of actuators and / or the second group of actuators; before the first group of actuators in the second delayed intervention step 200, the third abnormal handling step 300 and / or the fourth parameter calibration step 400 are started, the preset fifth delay time may be waited for, and if the preset intervention conditions are met after the fifth delay time is reached, the first group of actuators may be started.

[0061] Accordingly, if Fig.13 The internal combustion engine intercooler 600 shown in the figure comprises a first signal acquisition unit 610 and a second delay intervention unit 620; the first signal acquisition unit 610 acquires Fig.15 , 16 The dew point temperature 010 and the intake temperature 020 of the preset area of ​​the internal combustion engine 999 are shown; the second delayed intervention unit 620 keeps the output power, valve state and / or preset output state of the first group of actuators unchanged under the preset operating conditions until the preset first intervention condition 210 is met; the first intervention condition 210 indicates that the intake temperature 020 is less than the first decision temperature, and the first decision temperature is equal to the difference between the dew point temperature 010 and the first deviation temperature 011.

[0062] Among them, if the first intervention condition 210 is met, the first intervention process 099 is implemented on the intercooler water pump 002 and / or the first group of actuators, and the first intervention process 099 includes reducing the output power of the intercooler water pump 002 and / or executing a preset first intervention measure; the first intervention measure can reduce the intake air temperature 020.

[0063] Furthermore, if the opening of the intercooler water pump 002 reaches the first lower limit value 120 and maintains the preset second lag time, and the second lag time is greater than or equal to 0, the second intervention process 088 can be executed; the second intervention process 088 can take preset heating measures 321; the heating measures 321 include taking insulation measures, performing electric heating and / or reducing heat loss in a preset area.

[0064] Among them, if the intake temperature 020 is greater than the second decision temperature after adopting the second intervention process 088, the third intervention process 077 is executed; the third intervention process 077 includes stopping the execution of the heating measure 321; if the opening of the intercooler water pump 002 does not reach the first lower limit value 120, the opening of the intercooler water pump 002 can be reduced until it reaches the first lower limit value 120.

[0065] In addition, if the intake air temperature 020 is less than the third decision temperature, the first intervention process 099 can be restored; otherwise, the second intervention process 088 and / or the third intervention process 077 are prohibited; the first group of actuators includes a three-way valve 910, an intercooler water pump 002, a heat exchanger 006 and / or a supercharger 004.

[0066] Furthermore, the internal combustion engine intercooler 600 may also be provided with a third abnormal handling unit 630 and / or a fourth parameter calibration step 400; if the opening of the intercooler water pump 002 reaches the first lower limit value 120 and the intake temperature 020 is greater than the fourth decision temperature, then exit its first intervention process 099, the second intervention process 088, the third intervention process 077 and / or increase the output power of the intercooler water pump 002; its fourth decision temperature is equal to the sum of its dew point temperature 010 and the fourth deviation temperature 014; the fourth deviation temperature 014 is greater than zero and the fourth absolute value of the fourth deviation temperature 014 is greater than the preset fourth safety threshold.

[0067] Specifically, the overshoot of the intake temperature 020 and / or the fourth duty cycle of the first group of actuators are calibrated according to the ambient temperature, the first allowable range of the intake temperature 020, and the second allowable range of the difference between the intake temperature 020 and the dew point temperature 010. The fourth duty cycle represents the ratio of the fourth opening time of the first group of actuators to the fourth waiting time in the driving cycle.

[0068] Among them, the fourth parameter calibration unit 640 of the internal combustion engine intercooler 600 can further determine the coordination process of different actuators in the first group of actuators, and decompose the coordination process into a heating process and a cooling process and set a preset number N priorities; the heating process will also cause the intake temperature 020 to increase, and the cooling process will also cause the intake temperature 020 to decrease, and N is a positive integer.

[0069] Specifically, its first group of actuators may be limited to the intercooler water pump 002 and the three-way valve 910, and the preset second group of actuators may be disabled during the execution of its first signal acquisition unit 610, the second delay intervention unit 620, the third abnormality handling unit 630 and / or the fourth parameter calibration unit 640; its second group of actuators are actuators or devices other than the first group of actuators.

[0070] Among them, if the ambient temperature is lower than 0 degrees, the vehicle 900 is in the first starting condition, the vehicle 900 is in a preset condition and / or the vehicle 900 is in a preset second dynamic condition, the second delay intervention unit 620 may be prohibited from intervening in the first group of actuators and / or the second group of actuators.

[0071] Specifically, before the first group of actuators in the second delayed intervention unit 620, the third abnormal handling unit 630 and / or the fourth parameter calibration unit 640 are started, it is possible to wait for the preset fifth delay time. If the preset intervention conditions are still met after the fifth delay time is reached, the first group of actuators will be started.

[0072] Accordingly, if Fig.15 , 16 The computer storage medium 903 shown and Fig.14 The controllers 901 shown all adopt corresponding technical means; wherein, the computer storage medium 903 includes a storage medium body for storing computer programs; when the computer program is executed by a microprocessor, any of the above exhaust gas circulation control methods can be implemented; its controller 901 includes any of the above internal combustion engine intercooling devices 600 and / or computer storage media 903, which can be used to solve the same technical problems.

[0073] In practical applications, three-way valves and water pumps can be used as actuators to optimize the control scheme of supercharger intercooler; during the steady-state operation phase of the vehicle, misfires can be avoided and the frequent on-off operation of the equipment can be reduced, thereby improving the reliability and service life of the internal combustion engine and related accessories.

[0074] Specifically, it is necessary to Figure 3 , 4 The dew point data is determined by the formulas and methods in , 5, and 6; the dew point refers to the temperature of the air when it is cooled to a saturated state under the condition that the water vapor content and air pressure do not change; the smaller the water vapor pressure in the air, the lower the corresponding dew point; therefore, the difference between the dew point and the air temperature can be used to indicate the degree to which the water vapor in the air is away from saturation.

[0075] Specifically, if the above temperature is lower than 0°C, water vapor will frost, which is also called the frost point temperature. The saturated vapor pressure can usually be calculated using the Antoine formula, and the moisture content can be calculated based on the relative humidity and partial pressure, and finally the dew point T1 can be calculated.

[0076] like Figure 7 As shown, the schematic diagram of the working process of the water pump and the three-way valve in the embodiment of the present invention provides a condensation control strategy; since the set ambient temperature is greater than 0 degrees, EGR will take effect; therefore, when controlling the opening size of the water pump and the opening and closing of the electromagnetic three-way valve, the default ambient temperature is above 0°C, and the vehicle 900 is in a steady-state driving condition.

[0077] Specifically, the working steps or working states of the water pump and the three-way valve, i.e., the actuator, are as follows.

[0078] First, it is necessary to continuously detect the dew point temperature 010 and the intake air temperature 020 in the preset area; and determine whether the current intake air temperature T2 is less than the dew point temperature T1-a; wherein the margin value a is the first deviation temperature 011; if the condition is not met, the current operating state is maintained; if the condition is met, the boost intercooler water pump enters the condensation control cycle according to the preset strategy.

[0079] Furthermore, after entering the condensation control cycle, it is determined whether the water pump opening has reached the minimum opening; the minimum opening, for example 17%, is determined by hardware constraints; if the water pump opening has not reached the minimum state, the water pump opening can be gradually reduced according to the strategy requirements; at the same time, the three-way valve state remains unchanged temporarily; if the water pump opening has reached the minimum value and the intake air temperature T2 is still lower than the dew point temperature T1, the three-way valve is controlled to supply power to increase the intake air temperature.

[0080] Furthermore, if the three-way valve is in a state of supplying power to increase the intake air temperature; then it is determined by judging whether the intake air temperature T2 is greater than the dew point temperature T1+b; the margin value b is the second deviation temperature 012. If the condition is not met, the working state of the water pump and the three-way valve is kept unchanged; otherwise, the three-way valve is powered off to cool the intake air temperature and according to the cooling effect, the opening of the water pump is simultaneously reduced to prevent the intake air temperature from being cooled too low.

[0081] Furthermore, when the three-way valve is powered off and the water pump opening is reduced, it is determined whether the intake air temperature T2 is less than the dew point temperature T1-c, and the margin value c is the third deviation temperature 013; if the condition is not met, the working state of the water pump and the three-way valve remains unchanged; otherwise, it will continue to enter the above-mentioned condensation control cycle.

[0082] Specifically, in Figure 7 In the working process shown, when the intake air temperature T2 is less than a certain deviation from the dew point temperature T1, the water pump will gradually reduce its opening degree to maintain a minimum opening degree of 17% for a period of time (which can be adjusted through the calibration process) to prevent the water pump opening degree from jumping back and forth repeatedly and affecting the water temperature change.

[0083] At the same time, a safety strategy can also be added. For example, when the intake air temperature exceeds the dew point temperature by a large margin (for example, 10°C) while the water pump maintains the minimum opening, the strategy of forcibly exiting the water pump's minimum opening can be used to prevent the intake air temperature from continuing to rise during this period of time, causing engine knock and other phenomena, which would affect engine performance.

[0084] It should be taken into account that the opening of the electromagnetic three-way valve needs to take into account the ambient temperature, the intake air temperature 020, and the deviation between the intake air temperature 020 and the dew point temperature 010; it is not suitable to open it frequently and for a short period of time, which will shorten the life of the three-way valve or cause large fluctuations in the intake air temperature 020.

[0085] Among them, the opening of the water pump and the opening and closing coordination of the three-way valve need to be verified by wind tunnel tests under different ambient temperatures to ensure the coordination between the two and maintain the best vehicle performance.

[0086] like Figure 8 As shown, after the working sequence of the water pump and the three-way valve is optimized, the relationship between the intake air temperature 020 and the dew point temperature 010 under steady-state driving conditions can be improved; specifically, Fig. 9 , 10 , 11 show three common characteristics respectively; Fig. 9 As shown, the intake air temperature T2 and the dew point temperature T1 fluctuate periodically, and the temperature deviation between the two is about 3-5°C, rather than non-periodic large fluctuations, which is conducive to controlling the intake air temperature.

[0087] In addition, if Fig.10 As shown, the intake air temperature T2 is always higher than the dew point temperature T1, and the temperature deviation between the two can be controlled at about 3-5 degrees through calibration, which can also avoid the risk of fire condensation; or, Fig.11 As shown, there is a stable deviation between the intake air temperature T2 and the dew point temperature T1, and the temperature deviation between the two can still be controlled at around 3-5 degrees; and the solenoid valve action cycle is relatively long, which is beneficial to the performance control of the entire vehicle.

[0088] Compared with the related art, the embodiment of the present invention can optimize the opening and closing timing of the supercharger and intercooler three-way valve and the opening size of the water pump, and achieve beneficial effects in the following three dimensions: on the one hand, the operating point for the opening of EGR is increased, which can better play the role and performance of exhaust gas recovery; avoid the phenomenon of losing one while focusing on the other; secondly, the water pump and the three-way valve are used together to control the intake air temperature and prevent condensation of the whole vehicle, thereby avoiding the risk of fire; thirdly, it can improve driving performance, reduce fuel consumption and optimize emission indicators, so that EGR can be effectively applied in a wider range of operating conditions.

[0089] It should be noted that the above embodiments are only for more clearly illustrating the technical solutions of the present invention. Those skilled in the art will understand that the implementation methods of the present invention are not limited to the above contents, and obvious changes, replacements or substitutions based on the above contents do not exceed the scope of the technical solutions of the present invention; other implementation methods will also fall within the scope of the present invention without departing from the concept of the present invention.

Claims

1. An exhaust gas circulation control method, characterized in that The invention comprises a first signal acquisition step (100) and a second delayed intervention step (200); wherein: the first signal acquisition step (100) acquires the dew point temperature (010) T1 and the intake air temperature (020) T2 of a preset area of ​​the internal combustion engine (999); the second delayed intervention step (200) keeps the output power, valve state and / or preset output state of the first group of actuators unchanged (222) under preset working conditions until a preset first intervention condition (210) is met; the first intervention condition (210) indicates that the intake air temperature (020) T2 is less than a first decision temperature, and the first decision temperature is equal to the difference between the dew point temperature (010) T1 and a first deviation temperature (011) a.

2. The exhaust gas recirculation control method according to claim 1, wherein: If the first intervention condition (210) is satisfied, a first intervention process (099) is implemented on the intercooler water pump (002) and / or the first group of actuators, wherein the first intervention process (099) includes reducing the output power of the intercooler water pump (002) and / or executing a preset first intervention measure; the first intervention measure causes the intake air temperature (020) T2 to increase.

3. The exhaust gas recirculation control method according to claim 1 or 2, wherein: If the opening degree of the intercooler water pump (002) reaches a first lower limit value (120) and maintains a preset second lag time, and the second lag time is greater than or equal to 0, a second intervention process (088) is executed; the second intervention process (088) takes preset temperature increase measures (321); the temperature increase measures (321) include taking insulation measures, performing electric heating and / or reducing heat loss in the preset area.

4. The exhaust gas recirculation control method according to claim 3, wherein: If, after adopting the second intervention process (088), the intake air temperature (020) T2 is greater than the second decision temperature, the third intervention process (077) is executed; the third intervention process (077) includes stopping the execution of the temperature increase measure (321); if the opening degree of the intercooler water pump (002) does not reach the first lower limit value (120), reducing the opening degree of the intercooler water pump (002) until it reaches the first lower limit value (120).

5. The exhaust gas recirculation control method according to claim 4, wherein: If the intake air temperature (020) T2 is less than the third decision temperature, the first intervention process (099) is resumed; otherwise, the second intervention process (088) and / or the third intervention process (077) is prohibited.

6. The exhaust gas recirculation control method according to any one of claims 4 or 5, wherein: The first group of actuators includes a three-way valve (910), an intercooler water pump (002), a heat exchanger (006) and / or a supercharger (004).

7. The exhaust gas recirculation control method according to claim 6, wherein: The first deviation temperature (011) is greater than or equal to 0; the second decision temperature is equal to the sum of the dew point temperature (010) T1 and the second deviation temperature (012) b, and the second deviation temperature (012) is greater than 0; the third decision temperature is equal to the difference between the dew point temperature (010) T1 and the third deviation temperature (013) c, and the third deviation temperature (013) is greater than or equal to 0.

8. The exhaust gas circulation control method according to any one of claims 2, 4, 5 or 7, further comprising a third abnormal handling step (300); if the opening of the intercooler water pump (002) reaches the first lower limit value (120) and the intake temperature (020) T2 is greater than a fourth decision temperature, then exiting the first intervention process (099), the second intervention process (088), the third intervention process (077) and / or increasing the output power of the intercooler water pump (002); the fourth decision temperature is equal to the sum of the dew point temperature (010) T1 and a fourth deviation temperature (014); the fourth deviation temperature (014) is greater than zero and the fourth absolute value of the fourth deviation temperature (014) is greater than a preset fourth safety threshold.

9. The exhaust gas recirculation control method as claimed in claim 8, further comprising a fourth parameter calibration step (400); calibrating the overshoot of the intake air temperature (020) T2 and / or the fourth duty cycle of the first group of actuators according to the ambient temperature, the first allowable range of the intake air temperature (020) T2, and the second allowable range of the difference between the intake air temperature (020) T2 and the dew point temperature (010) T1, wherein the fourth duty cycle represents the ratio of a fourth opening time of the first group of actuators to a fourth waiting time in a driving cycle.

10. The exhaust gas recirculation control method according to claim 9, wherein: The fourth parameter calibration step (400) further determines the coordination process of different actuators in the first group of actuators, decomposes the coordination process into a heating process and a cooling process, and sets a preset number N of priorities; The temperature increase process will cause the intake air temperature (020) T2 to increase, and the temperature decrease process will cause the intake air temperature (020) T2 to decrease, and N is a positive integer.

11. The exhaust gas recirculation control method according to claim 9 or 10, wherein: The first group of actuators is limited to the intercooler water pump (002) and the three-way valve (910), and during the execution of the first signal acquisition step (100), the second delay intervention step (200), the third abnormality handling step (300) and / or the fourth parameter calibration step (400), the preset second group of actuators is disabled; the second group of actuators are actuators or devices other than the first group of actuators.

12. The exhaust gas recirculation control method according to claim 11, wherein: If the ambient temperature is lower than 0 degrees, the vehicle (900) is in a first starting condition, the vehicle (900) is in a preset condition and / or the vehicle (900) is in a preset second dynamic condition, the second delay intervention step (200) is prohibited from intervening in the first group of actuators and / or the second group of actuators; before the first group of actuators is started in the second delay intervention step (200), the third abnormality handling step (300) and / or the fourth parameter calibration step (400), wait for a preset fifth delay time, and if the preset intervention condition is met after the fifth delay time is reached, start the first group of actuators.

13. An internal combustion engine intercooler (600), comprising a first signal acquisition unit (610) and a second delay intervention unit (620); wherein: The first signal acquisition unit (610) obtains the dew point temperature (010) T1 and the intake air temperature (020) T2 of a preset area of ​​the internal combustion engine (999); the second delay intervention unit (620) keeps the output power, valve state and / or preset output state of the first group of actuators unchanged (222) under preset working conditions until a preset first intervention condition (210) is met; the first intervention condition (210) indicates that the intake air temperature (020) T2 is less than a first decision temperature, and the first decision temperature is equal to the difference between the dew point temperature (010) T1 and a first deviation temperature (011) a; if the first intervention condition (210) is met, a first intervention process (099) is implemented on the intercooler water pump (002) and / or the first group of actuators, and the first intervention process (099) includes reducing the output power of the intercooler water pump (002) and / or executing a preset first intervention measure; the first intervention measure causes the intake air temperature (020) T2 to increase.

14. The internal combustion engine intercooler (600) according to claim 13, wherein: If the opening degree of the intercooler water pump (002) reaches the first lower limit value (120) and maintains a preset second lag time, and the second lag time is greater than or equal to 0, a second intervention process (088) is executed; the second intervention process (088) adopts a preset temperature increase measure (321); the temperature increase measure (321) includes taking a heat preservation measure, performing electric heating and / or reducing the heat loss of the preset area; if after the second intervention process (088) is adopted, the intake air temperature (020) T2 is greater than the second decision temperature, a third intervention process (077) is executed; the third intervention process (077) includes Stop executing the temperature increase measure (321); if the opening of the intercooler water pump (002) does not reach the first lower limit value (120), reduce the opening of the intercooler water pump (002) until it reaches the first lower limit value (120); if the intake air temperature (020) T2 is less than the third decision temperature, resume executing the first intervention process (099); otherwise, prohibit executing the second intervention process (088) and / or the third intervention process (077); the first group of actuators includes a three-way valve (910), an intercooler water pump (002), a heat exchanger (006) and / or a supercharger (004).

15. The internal combustion engine intercooler (600) according to claim 13 or 14, further comprising a third abnormality handling unit (630) and / or a fourth parameter calibration step (400); if the opening of the intercooler water pump (002) reaches the first lower limit value (120) and the intake air temperature (020) T2 is greater than a fourth decision temperature, then the first intervention process (099), the second intervention process (088), the third intervention process (077) and / or the output power of the intercooler water pump (002) is exited; the fourth decision temperature is equal to the dew point temperature (010) T1 and a fourth deviation temperature (014); the fourth deviation temperature (014) is greater than zero and a fourth absolute value of the fourth deviation temperature (014) is greater than a preset fourth safety threshold; the overshoot of the intake temperature (020) T2 and / or the fourth duty cycle of the first group of actuators are calibrated according to the ambient temperature, the first allowable range of the intake temperature (020) T2, and the second allowable range of the difference between the intake temperature (020) T2 and the dew point temperature (010) T1, wherein the fourth duty cycle represents a ratio of a fourth opening time of the first group of actuators to a fourth waiting time in a driving cycle.

16. The internal combustion engine intercooler (600) according to claim 15, wherein: The fourth parameter calibration unit (640) further determines the coordination process of different actuators in the first group of actuators, decomposes the coordination process into a heating process and a cooling process, and sets a preset number N of priorities; The heating process will cause the intake air temperature (020) T2 to increase, and the cooling process will cause the intake air temperature (020) T2 to decrease, and N is a positive integer; the first group of actuators is limited to the intercooler water pump (002) and the three-way valve (910), and during the execution of the first signal acquisition unit (610), the second delay intervention unit (620), the third abnormality handling unit (630) and / or the fourth parameter calibration unit (640), the preset second group of actuators is disabled; the second group of actuators are actuators or devices other than the first group of actuators.

17. The internal combustion engine intercooler (600) according to claim 13, 14 or 16, wherein: If the ambient temperature is lower than 0 degrees, the vehicle (900) is in a first starting condition, the vehicle (900) is in a preset condition and / or the vehicle (900) is in a preset second dynamic condition, the second delay intervention unit (620) is prohibited from intervening in the first group of actuators and / or the second group of actuators; before the first group of actuators in the second delay intervention unit (620), the third abnormality handling unit (630) and / or the fourth parameter calibration unit (640) are started, wait for a preset fifth delay time, and if the preset intervention condition is met after the fifth delay time is reached, start the first group of actuators.

18. A computer storage medium (903), comprising a storage medium body for storing a computer program; when the computer program is executed by a microprocessor, the exhaust gas recirculation control method according to any one of claims 1 to 12 is implemented.

19. A controller (901), comprising the internal combustion engine intercooling device (600) according to any one of claims 13 to 17 and / or the computer storage medium (903) according to claim 18.

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