Intercooling control system and control method thereof, electronic equipment and engine assembly
By setting up an intercooling bypass valve upstream of the engine intercooler, the valve opening is adjusted according to the intake air temperature and humidity, the problem of condensate after intercooling is solved, and the combustion stability and fuel consumption are improved.
Patent Information
- Application Number
- CN202411319577.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-02-07
Smart Images
Figure CN119393218A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of vehicle technology, and in particular to an intercooler control system, a control method for an intercooler control system, an electronic device, a computer-readable storage medium, an engine assembly and a vehicle. Background Art
[0002] Exhaust Gas Recirculation (EGR) is a rapidly developing energy-saving and emission-reduction technology in recent years, and has become a standard feature of mainstream hybrid engines. However, for turbocharged engines with low-pressure cooling EGR, the high-humidity and high-temperature intake air treated by the compressor will be cooled by the intercooler, and the temperature will drop below the dew point temperature, thereby generating condensed water, which will flow into the cylinders closer to the engine intake manifold inlet, seriously damaging the engine's combustion stability and fuel consumption.
[0003] In order to avoid the generation of condensed water after intercooling, a method of correcting the EGR rate based on the condensation amount has been proposed in the related art. However, while this method reduces the EGR rate, it will lose the thermal efficiency of the engine and increase the fuel consumption. A method of avoiding condensation by reducing the circulating water flow of the intercooler or shutting off the circulating water of the intercooler to increase the temperature after intercooling to above the dew point temperature has also been proposed. However, since the low-temperature cooling water pump of a hybrid vehicle usually needs to take into account the cooling needs of the motor, inverter, etc., and since the specific heat capacity of water is very high, the adjustment speed of the cold temperature in the dynamic process is very slow, so its application is limited. Summary of the invention
[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present invention is to propose an intercooler control system, which can automatically adjust the valve opening according to the intake air temperature and humidity upstream of the engine intercooler by setting an intercooler bypass valve. Under high humidity and low temperature conditions, the intercooler bypass valve allows part of the intake air to directly reach the intake pipe after the intercooler without passing through the intercooler. Due to the high flow rate and small specific heat of the gas, the gas temperature after the intercooler can be quickly adjusted by controlling the bypass valve to avoid the generation of condensed water and increase the temperature before the throttle valve, so as to suppress the combustion abnormality and fuel consumption deterioration caused by the generation of condensed water after the intercooler.
[0005] A second object of the present invention is to provide a control method for an intercooler control system.
[0006] A third objective of the present invention is to provide an electronic device.
[0007] A fourth object of the present invention is to provide a computer-readable storage medium.
[0008] A fifth object of the present invention is to provide an engine assembly.
[0009] A sixth object of the present invention is to provide a vehicle.
[0010] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes an intercooler control system, including: an intercooler, a front intercooler intake pipe is arranged at the flow inlet of the intercooler, and a rear intercooler outlet pipe is arranged at the flow outlet of the intercooler; a cylinder intake manifold, the cylinder intake manifold is connected with the intercooler through the rear intercooler outlet pipe; a bypass connecting pipeline with an intercooler bypass valve is arranged, the air inlet of the bypass connecting pipeline is selectively connected with the front intercooler intake pipe, and the air outlet of the bypass connecting pipeline is selectively connected with the rear intercooler outlet pipe; a controller, the controller is used to control the opening of the intercooler bypass valve according to the bypass intercooler intake amount of the bypass connecting pipeline.
[0011] In addition, the intercooler control system according to the above embodiment of the present invention may also have the following additional technical features:
[0012] According to some embodiments of the present invention, the above-mentioned intercooler control system also includes: a compressor, the compressor is connected to the intercooler through the air intake pipe before the intercooler, the compressor is used to mix and supercharge the circulating exhaust gas delivered by the EGR cooler and the air delivered by the air filter, and deliver the mixed and supercharged mixed gas to the air intake pipe before the intercooler; an EGR cooler, an EGR valve is arranged between the EGR cooler and the compressor, the EGR cooler is selectively connected to the compressor, the EGR cooler is used to provide the compressor with cooled circulating exhaust gas; an air filter, a mixing valve is arranged between the air filter and the compressor, the air filter is selectively connected to the compressor, and the air filter is used to provide filtered air to the compressor.
[0013] According to some embodiments of the present invention, the above-mentioned intercooler control system also includes: an air flow sensor arranged at the air outlet of the air filter, for measuring a first intake air flow and a first intake air humidity of the filtered air, and sending the first intake air flow and the first intake air humidity to a controller; wherein the first intake air flow and the first intake air humidity are used to calculate the bypass intercooler intake volume.
[0014] According to some embodiments of the present invention, the above-mentioned intercooler control system also includes: an intake temperature sensor arranged in the cylinder intake manifold, which is used to measure the gas temperature delivered to the cylinder by the outlet pipe after the intercooler, and send the gas temperature to the controller; wherein the gas temperature is used to adjust the opening of the intercooler bypass valve.
[0015] According to an embodiment of the present invention, the intercooler control system includes: an intercooler, a front intercooler intake pipe is provided at the flow inlet of the intercooler, and a rear intercooler outlet pipe is provided at the flow outlet of the intercooler; a cylinder intake manifold, the cylinder intake manifold is connected with the intercooler through the rear intercooler outlet pipe; a bypass connecting pipeline with an intercooler bypass valve is provided, the air inlet of the bypass connecting pipeline is selectively connected with the front intercooler intake pipe, and the air outlet of the bypass connecting pipeline is selectively connected with the rear intercooler outlet pipe; a controller, the controller is used to control the opening of the intercooler bypass valve according to the bypass intercooler intake amount of the bypass connecting pipeline. Therefore, the system can automatically adjust the valve opening according to the intake air temperature and humidity upstream of the engine intercooler by setting an intercooler bypass valve. Under high humidity and low temperature conditions, the intercooler bypass valve allows part of the intake air to reach the intake pipe after the intercooler directly without passing through the intercooler. Due to the high flow rate and small specific heat of the gas, the gas temperature after the intercooler can be quickly adjusted by controlling the bypass valve to avoid the generation of condensed water and increase the temperature before the throttle valve, so as to suppress the generation of condensed water after the intercooler, which may cause abnormal combustion and worse fuel consumption.
[0016] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the second purpose of the present invention is to propose a control method for an intercooler control system, by setting an intercooler bypass valve, the required bypass gas volume can be comprehensively calculated based on the intercooler water temperature, the gas temperature before the intercooler, the gas quality, the moisture content, etc., and further closed-loop adjustment can be made according to the actual intake air temperature to adjust the opening of the intercooler bypass valve according to the required bypass gas volume. Under high humidity and low temperature conditions, the intercooler bypass valve allows part of the intake air to directly reach the intake pipe after the intercooler without passing through the intercooler. Due to the high flow rate and small specific heat of the gas, the gas temperature after the intercooler can be quickly adjusted by controlling the bypass valve to avoid the generation of condensed water and increase the temperature before the throttle valve to suppress the combustion abnormality and fuel consumption deterioration caused by the generation of condensed water after the intercooler.
[0017] To achieve the above-mentioned purpose, the second aspect of the embodiment of the present invention proposes a control method for an intercooler control system, which is applied to the above-mentioned intercooler control system, including: obtaining a first intake flow rate of filtered air, a first intake humidity of filtered air, an opening value of an EGR valve, a second intake flow rate of cooled circulating exhaust gas, and a second intake humidity of cooled circulating exhaust gas through a controller; determining a dew point temperature at which condensation of the mixed gas occurs according to the first intake flow rate, the first intake humidity, the opening value, the second intake flow rate, and the second intake humidity; wherein the mixed gas is obtained by mixing and supercharging filtered air and cooled circulating exhaust gas; determining a bypass intercooler intake amount of the bypass connecting pipeline according to the dew point temperature, the actual temperature of the mixed gas, the condensing water temperature of the intercooler, and a preset temperature difference threshold; wherein the temperature difference threshold represents a difference between a predetermined temperature of the gas in the intercooler rear outlet pipe of the intercooler and a predetermined condensing water temperature of the intercooler.
[0018] In addition, the control method of the intercooler control system according to the above embodiment of the present invention may also have the following additional technical features:
[0019] According to some embodiments of the present invention, the dew-point temperature at which condensation of the mixed gas occurs is determined according to the first intake flow rate, the first intake humidity, the opening value, the second intake flow rate and the second intake humidity, including: querying a saturated air humidity table according to the first intake flow rate and the first intake humidity to determine a first water vapor mass of the water vapor passing through the mixing valve; determining a second water vapor mass of the water vapor passing through the EGR valve according to the opening value, the second intake flow rate and the second intake humidity; determining the total mass of the mixed gas according to the first intake flow rate and the second intake flow rate; determining the total content of water vapor in the mixed gas according to the first water vapor mass and the second water vapor mass; determining the dew-point temperature at which condensation of the mixed gas occurs according to the total mass of the mixed gas and the total content of water vapor in the mixed gas.
[0020] According to some embodiments of the present invention, determining the bypass intercooler intake amount of the bypass connecting pipeline according to the dew point temperature, the actual temperature of the mixed gas, the condensed water temperature of the intercooler, and a preset temperature difference threshold includes:
[0021]
[0022] Wherein, mp is the bypass intercooler intake volume of the bypass connecting pipeline, mz is the total mass of the mixed gas, mzh is the total content of water vapor in the mixed gas, T L is the dew point temperature, T in is the actual temperature of the mixed gas, T W is the condensing water temperature of the intercooler, and ΔT is the preset temperature difference threshold.
[0023] According to some embodiments of the present invention, the above method also includes: determining a target opening value for the intercooler bypass valve based on the bypass intercooler intake volume; controlling the opening of the intercooler bypass valve according to the target opening value to adjust the gas flow in the bypass connecting pipeline, and then adjusting the gas flow entering the intercooler.
[0024] According to some embodiments of the present invention, the control method of the above-mentioned intercooler control system also includes: obtaining, through a controller, the gas temperature delivered to the cylinder by the intercooler rear outlet pipe measured by an intake temperature sensor arranged in the cylinder intake manifold; judging whether the gas temperature reaches the dew point temperature, and in response to the gas temperature not reaching the dew point temperature, controlling to increase the opening of the intercooler bypass valve.
[0025] According to some embodiments of the present invention, the control method of the above-mentioned intercooler control system also includes: in response to the gas temperature reaching the dew point temperature, judging whether the difference between the gas temperature and the dew point temperature reaches a preset difference; in response to the difference between the gas temperature and the dew point temperature reaching the preset difference, controlling to reduce the opening of the intercooler bypass valve.
[0026] According to the control method of the intercooler control system of an embodiment of the present invention, a first intake flow rate of filtered air, a first intake humidity of filtered air, an opening value of an EGR valve, a second intake flow rate of cooled circulating exhaust gas, and a second intake humidity of cooled circulating exhaust gas are obtained through a controller, and a dew point temperature at which condensation of the mixed gas occurs is determined according to the first intake flow rate, the first intake humidity, the opening value, the second intake flow rate, and the second intake humidity; wherein the mixed gas is obtained by mixing and supercharging filtered air and cooled circulating exhaust gas, and the bypass intercooler intake amount of the bypass connecting pipeline is determined according to the dew point temperature, the actual temperature of the mixed gas, the condensing water temperature of the intercooler, and a preset temperature difference threshold; wherein the temperature difference threshold represents the difference between the predetermined temperature of the gas in the intercooler rear outlet pipe of the intercooler and the condensing water temperature of the intercooler. Therefore, the method can calculate the required bypass gas volume based on the intercooler water temperature, the gas temperature before the intercooler, the gas quality, the moisture content, etc. by setting the intercooler bypass valve, and further adjust the closed loop according to the actual intake air temperature to adjust the opening of the intercooler bypass valve according to the required bypass gas volume. Under high humidity and low temperature conditions, the intercooler bypass valve allows part of the intake air to reach the intake pipe after the intercooler directly without passing through the intercooler. Due to the high flow rate and small specific heat of the gas, the gas temperature after the intercooler can be quickly adjusted by controlling the bypass valve to avoid the generation of condensed water and increase the temperature before the throttle valve to suppress the combustion abnormalities and fuel consumption deterioration caused by the generation of condensed water after the intercooler.
[0027] To achieve the above objectives, a third aspect of the present invention proposes an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the control method of the intercooler control system is implemented.
[0028] According to the electronic device of the embodiment of the present invention, by executing the control method of the intercooler control system mentioned above, the gas temperature after the intercooler can be quickly adjusted and the temperature before the throttle valve can be increased to suppress the generation of condensed water after the intercooler and the resulting combustion abnormalities and worsened fuel consumption.
[0029] To achieve the above objectives, a fourth aspect of the present invention provides a computer-readable storage medium, and when a computer program is executed by a processor, the control method of the intercooler control system is implemented.
[0030] According to the computer-readable storage medium of an embodiment of the present invention, by executing the control method of the above-mentioned intercooler control system, the gas temperature after intercooler can be quickly adjusted and the temperature before the throttle valve can be increased to suppress the generation of condensed water after intercooler and the resulting combustion abnormalities and worsening fuel consumption.
[0031] To achieve the above-mentioned purpose, a fifth aspect of the present invention provides an engine assembly, including the above-mentioned intercooler control system, and the above-mentioned intercooler control system is used to execute the above-mentioned control method of the intercooler control system.
[0032] According to the engine assembly of the embodiment of the present invention, by executing the control method of the intercooler control system mentioned above, the gas temperature after the intercooler can be quickly adjusted and the temperature before the throttle valve can be increased to suppress the generation of condensed water after the intercooler and the resulting combustion abnormalities and worsened fuel consumption.
[0033] To achieve the above objectives, a sixth aspect of the present invention provides a vehicle comprising the above engine assembly.
[0034] According to the vehicle of the embodiment of the present invention, the gas temperature after intercooling can be quickly adjusted to increase the temperature before the throttle valve to suppress the generation of condensed water after intercooling and the resulting abnormal combustion and worsened fuel consumption.
[0035] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] Figure 1 is an overall schematic diagram of an intercooler control system according to some embodiments of the present invention;
[0037] Figure 2 is a flow chart of a control method of an intercooler control system according to some embodiments of the present invention;
[0038] Figure 3 is a flow chart of a control method of an intercooler control system according to some other embodiments of the present invention;
[0039] Figure 4 is a block diagram of an electronic device according to some embodiments of the present invention;
[0040] Figure 5 is a block diagram of a vehicle according to some embodiments of the present invention.
[0041] Description of reference numerals:
[0042] Air filter 1, mixing valve 2, compressor 3, intercooler 4, throttle valve 5, cylinder intake manifold 6, cylinder 7, turbine 8, waste gas bypass valve 9, after-treatment device 10, muffler 11, EGR cooler 12, EGR valve 13, intercooler bypass valve 14, bypass connecting pipeline 15, intercooler front intake pipe 16 and intercooler rear outlet pipe 17. DETAILED DESCRIPTION
[0043] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0044] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0045] As mentioned in the background technology section, exhaust gas recirculation is a rapidly developing energy-saving and emission-reduction technology in recent years, and has become a standard feature of mainstream hybrid engines. However, for turbocharged engines with low-pressure cooling EGR, the high-humidity and high-temperature intake air treated by the compressor will be cooled by the intercooler, and the temperature will drop below the dew point temperature, thereby generating condensed water, which will flow into the cylinder closer to the engine intake manifold inlet, seriously damaging the engine's combustion stability and fuel consumption.
[0046] In the process of realizing the present invention, the applicant found that in order to avoid the generation of condensed water after intercooling, a method of correcting the EGR rate based on the condensation amount was proposed in the related art, but this method will lose the thermal efficiency of the engine and increase the fuel consumption while reducing the EGR rate. A method of avoiding condensation by reducing the circulating water flow of the intercooler or shutting off the circulating water of the intercooler to increase the temperature after intercooling to above the dew point temperature was also proposed, but since the low-temperature cooling water pump of a hybrid vehicle usually needs to take into account the cooling requirements of the motor, inverter, etc., and since the specific heat capacity of water is very high, the adjustment speed of the cold temperature in the dynamic process is very slow, so the application is limited.
[0047] In the related technology, the problem of unstable combustion in individual cylinders caused by condensed water can also be solved by evenly distributing the condensed water, such as first recovering the condensed water into a water tank and then spraying it into the intake duct, but this solution is complex and costly. Another example is to achieve even distribution of condensed water through diversion, but the flow of condensed water under airflow and gravity is complex, so the effect of diversion is limited.
[0048] An intercooler control system, an intercooler control method, an electronic device, a computer-readable storage medium, an engine assembly, and a vehicle according to embodiments of the present invention will be described below with reference to the accompanying drawings.
[0049] Figure 1 Schematic diagram of an overall intercooler control system according to some embodiments of the present invention.
[0050] like Figure 1 As shown, the intercooler control system of the present application may include an air filter 1, a mixing valve 2, a compressor 3, an intercooler 4, a throttle 5, a cylinder intake manifold 6, a cylinder 7, a turbine 8, an exhaust gas bypass valve 9, an after-treatment device 10, a muffler 11, an EGR cooler 12, an EGR valve 13, an intercooler bypass valve 14, a bypass connecting line 15, an intercooler front intake pipe 16 and an intercooler rear outlet pipe 17.
[0051] The flow inlet of the intercooler 4 is provided with an intercooler front air intake pipe 16 , and the flow outlet of the intercooler 4 is provided with an intercooler rear air outlet pipe 17 .
[0052] The cylinder intake manifold 6 is connected to the intercooler 4 through the intercooler rear outlet pipe 17, the air inlet of the bypass connecting line 15 is selectively connected to the intercooler front intake pipe 16, the air outlet of the bypass connecting line 15 is selectively connected to the intercooler rear outlet pipe 17, and the bypass connecting line 15 is provided with an intercooler bypass valve 14, wherein the intercooler bypass valve 14 can be an electrically controlled butterfly valve or an electrically controlled lifting valve, etc.
[0053] The controller (not shown in the figure) is used to control the opening degree of the intercooler bypass valve 14 according to the bypass intercooler intake air volume of the bypass connecting pipeline 15 .
[0054] The compressor 3 is connected to the intercooler 4 through the intercooler front intake pipe 16. The compressor 3 is used to mix and supercharge the circulating exhaust gas delivered by the EGR cooler 12 and the air delivered by the air filter 1, and deliver the mixed and supercharged mixed gas to the intercooler front intake pipe 16.
[0055] An EGR valve 13 is provided between the EGR cooler 12 and the compressor 3 . The EGR cooler 12 is selectively connected to the compressor 3 . The EGR cooler 12 is used to provide the compressor 3 with cooled circulating exhaust gas.
[0056] A mixing valve 2 is provided between the air filter 1 and the compressor 3 , and the air filter 1 is selectively connected to the compressor 3 . The air filter 1 is used to provide filtered air to the compressor 3 .
[0057] An air flow sensor (not shown in the figure) is arranged at the air outlet of the air filter 1, and is used to measure the first intake air flow and the first intake air humidity of the filtered air, and send the first intake air flow and the first intake air humidity to the controller, wherein the first intake air flow and the first intake air humidity are used to calculate the bypass intercooler intake volume.
[0058] An intake air temperature sensor (not shown) is disposed in the cylinder intake manifold 6 and is used to measure the temperature of the gas delivered to the cylinder 7 by the intercooler rear outlet pipe 17 and to send the gas temperature to a controller, wherein the gas temperature is used to adjust the opening of the intercooler bypass valve 14.
[0059] As a specific embodiment, fresh air enters from the air filter 1, and the filtered air is mixed with the exhaust gas from the EGR valve 13 after passing through the mixing valve 2. The mixed gas enters the compressor 3, and the compressor 3 increases the pressure of the mixed gas. Since the temperature of the gas is high after the pressure is increased, it needs to be cooled. Therefore, part of the gas passing through the air compressor will enter the intercooler 4 from the front intake pipe 16 of the intercooler to cool part of the gas, and the other part of the gas passing through the air compressor will enter the bypass connecting pipeline 15 through the intercooler bypass valve 14, that is, the other part of the high temperature gas after the pressurization The gas reaches the throttle valve 5 directly without passing through the intercooler 4, and then the cooled gas is mixed with the gas entering the bypass connecting pipe 15 to increase the temperature before the throttle valve 5, suppress the generation of condensed water after the intercooler and the resulting combustion abnormality and worsening fuel consumption, and flows into the cylinder intake manifold 6 through the throttle valve 5, and then enters the cylinder 7 for combustion and work, and then the exhaust gas passes through the turbine 8 or the exhaust bypass valve 9 to enter the post-treatment device 10, and finally flows out of the exhaust pipe through the muffler 11 into the atmosphere; the recirculated exhaust gas passes through the EGR cooler 12 and then returns to the intake through the EGR valve 13.
[0060] In summary, the intercooler control system according to the embodiment of the present invention includes: an intercooler, a front intercooler intake pipe is provided at the flow inlet of the intercooler, and a rear intercooler outlet pipe is provided at the flow outlet of the intercooler; a cylinder intake manifold, the cylinder intake manifold is connected with the intercooler through the rear intercooler outlet pipe; a bypass connecting pipeline with an intercooler bypass valve is provided, the air inlet of the bypass connecting pipeline is selectively connected with the front intercooler intake pipe, and the air outlet of the bypass connecting pipeline is selectively connected with the rear intercooler outlet pipe; a controller, the controller is used to control the opening of the intercooler bypass valve according to the bypass intercooler intake amount of the bypass connecting pipeline. Therefore, the system can automatically adjust the valve opening according to the intake air temperature and humidity upstream of the engine intercooler by setting an intercooler bypass valve. Under high humidity and low temperature conditions, the intercooler bypass valve allows part of the intake air to reach the intake pipe after the intercooler directly without passing through the intercooler. Due to the high flow rate and small specific heat of the gas, the gas temperature after the intercooler can be quickly adjusted by controlling the bypass valve to avoid the generation of condensed water and increase the temperature before the throttle valve, so as to suppress the generation of condensed water after the intercooler, which may cause abnormal combustion and worse fuel consumption.
[0061] refer to Figure 2 , is a flow chart of a control method of an intercooler control system according to some embodiments of the present invention.
[0062] like Figure 2 As shown, the control method of the intercooler control system according to the embodiment of the present invention may include the following steps:
[0063] S201, obtaining, through a controller, a first intake flow rate of filtered air, a first intake humidity of filtered air, an opening value of an EGR valve, a second intake flow rate of cooled circulating exhaust gas, and a second intake humidity of cooled circulating exhaust gas.
[0064] Exemplarily, the first intake flow ma and the first intake humidity of the filtered air can be detected by an air flow sensor arranged at the air outlet of the air filter, and the second intake flow me of the cooled circulating exhaust gas and the second intake humidity of the cooled circulating exhaust gas can be detected by an air flow sensor arranged at the exhaust gas outlet of the EGR cooler. Then, the opening value of the EGR valve is determined according to the second intake flow me of the cooled circulating exhaust gas, and the first intake flow ma of the filtered air, the first intake humidity of the filtered air, the opening value of the EGR valve, the second intake flow me of the cooled circulating exhaust gas and the second intake humidity of the cooled circulating exhaust gas are sent to a controller, and the first intake flow ma of the filtered air, the first intake humidity of the filtered air, the opening value of the EGR valve, the second intake flow me of the cooled circulating exhaust gas and the second intake humidity of the cooled circulating exhaust gas are obtained by the controller.
[0065] S202, determining the dew point temperature at which the mixed gas condenses according to the first intake air flow, the first intake air humidity, the opening value, the second intake air flow and the second intake air humidity; wherein the mixed gas is obtained by mixing and pressurizing filtered air and cooled circulating exhaust gas.
[0066] Specifically, after obtaining the intake air flow rate, intake air humidity and the opening value of the EGR valve, the dew point temperature T at which the mixed gas obtained by mixing and supercharging the filtered air and the cooled circulating exhaust gas condenses is determined according to the first intake air flow rate ma, the first intake air humidity, the opening value, the second intake air flow rate me and the second intake air humidity. L For example, the water vapor mass mh1 entering the engine through the mixing valve is first determined according to the first intake flow ma and the first intake humidity, and the water vapor mass mh2 entering the engine through the mixing valve is determined according to the second intake flow me and the second intake humidity. Then, the first intake flow ma and the second intake flow me are added to calculate the total intake flow mz, and the two water vapor masses are added to calculate the total water vapor mass mzh. Finally, the dew point temperature T at which the mixed gas condenses is determined according to the total intake flow mz and the total water vapor mass mzh. L .
[0067] In some embodiments of the present invention, the dew point temperature at which condensation of the mixed gas occurs is determined based on the first intake flow rate, the first intake humidity, the opening value, the second intake flow rate and the second intake humidity, including: querying the saturated air humidity table based on the first intake flow rate and the first intake humidity to determine the first water vapor mass of the water vapor passing through the mixing valve; determining the second water vapor mass of the water vapor passing through the EGR valve based on the opening value, the second intake flow rate and the second intake humidity; determining the total mass of the mixed gas based on the first intake flow rate and the second intake flow rate; determining the total content of water vapor in the mixed gas based on the first water vapor mass and the second water vapor mass; determining the dew point temperature at which condensation of the mixed gas occurs based on the total mass of the mixed gas and the total content of water vapor in the mixed gas.
[0068] Specifically, after obtaining the first intake flow ma, the first intake humidity, the opening value, the second intake flow me and the second intake humidity, the saturated air humidity table is queried according to the first intake flow ma and the first intake humidity to obtain the first water vapor mass mh1 of the water vapor entering the engine through the mixing valve. Then, according to the opening value of the EGR valve and its calibration model, the second intake flow me and the second intake humidity can be obtained, and according to the opening value, the second intake flow me and the second intake humidity, the second water vapor mass mh2 of the water vapor passing through the EGR valve is obtained. The total mass mz of the mixed gas can be obtained by adding the first intake flow ma to the second intake flow me, and the total content mzh of water vapor in the mixed gas can be obtained by adding the first water vapor mass mh1 to the second water vapor mass mh2. After obtaining the total mass mz of the mixed gas and the total content mzh of water vapor in the mixed gas, the dew point temperature comparison table is queried according to the total mass mz of the mixed gas and the total content mzh of water vapor in the mixed gas to obtain the dew point temperature T at which the mixed gas condenses. L .
[0069] S203, determining the bypass intercooler intake volume of the bypass connecting pipeline according to the dew point temperature, the actual temperature of the mixed gas, the condensing water temperature of the intercooler, and a preset temperature difference threshold; wherein the temperature difference threshold represents the difference between the predetermined temperature of the gas in the intercooler rear outlet pipe of the intercooler and the condensing water temperature of the intercooler.
[0070] Specifically, the dew point temperature T at which the mixed gas condenses is obtained. L After that, the actual temperature T of the mixed gas can be detected by the temperature sensor installed in the intake pipe before the intercooler. in The condensing water temperature T of the intercooler can be detected by setting a temperature sensor in the intercooler W , according to the dew point temperature T L , the actual temperature of the mixed gas T in , intercooler condensing water temperature T W , and the predetermined temperature of the gas in the intercooler outlet pipe and the condensing water temperature T of the intercooler W The difference determines the bypass intercooler intake air volume mp of the bypass connecting pipe.
[0071] In some embodiments of the present invention, the bypass intercooler intake air volume of the bypass connecting pipeline is determined according to the dew point temperature, the actual temperature of the mixed gas, the condensed water temperature of the intercooler, and a preset temperature difference threshold, including:
[0072]
[0073] Wherein, mp is the bypass intercooler intake volume of the bypass connecting pipeline, mz is the total mass of the mixed gas, mzh is the total content of water vapor in the mixed gas, TL is the dew point temperature, T in is the actual temperature of the mixed gas, T W is the condensing water temperature of the intercooler, and ΔT is the preset temperature difference threshold.
[0074] Furthermore, in some embodiments of the present invention, the method further comprises: determining a target opening value for the intercooler bypass valve according to the bypass intercooler intake volume; controlling the opening of the intercooler bypass valve according to the target opening value to adjust the gas flow of the bypass connecting pipeline, thereby adjusting the gas flow entering the intercooler. The target opening value can be calibrated according to actual conditions.
[0075] Specifically, after obtaining the total mass mz of the mixed gas, the total content mzh of water vapor in the mixed gas, and the dew point temperature T L , the actual temperature of the mixed gas T in , intercooler condensing water temperature T W and the preset gas temperature after intercooling and the condensing water temperature T of the intercooler W After the temperature difference, according to the formula The bypass intercooler air intake volume mp of the bypass connecting pipeline can be calculated, and then the target opening value of the intercooler bypass valve is determined according to the bypass intercooler air intake volume mp (that is, the larger the bypass intercooler air intake volume, the larger the target opening value of the intercooler bypass valve). After obtaining the target opening value, the opening of the intercooler bypass valve is controlled according to the target opening value to quickly adjust the gas flow of the bypass connecting pipeline, and then quickly adjust the gas flow entering the intercooler.
[0076] In some embodiments of the present invention, the control method of the above-mentioned intercooler control system also includes: obtaining, through a controller, the gas temperature delivered to the cylinder by the intercooler rear outlet pipe measured by an intake temperature sensor arranged in the cylinder intake manifold; judging whether the gas temperature reaches the dew point temperature, and in response to the gas temperature not reaching the dew point temperature, controlling to increase the opening of the intercooler bypass valve.
[0077] Specifically, after adjusting the gas flow entering the intercooler, due to the complexity of the system heat transfer control will have deviations. Therefore, it is necessary to use the controller to obtain the gas temperature delivered to the cylinder by the intercooler rear outlet pipe measured by the intake temperature sensor installed in the cylinder intake manifold, and determine whether the gas temperature has reached the dew point temperature. When the gas temperature has not reached the dew point temperature, it means that the gas delivered to the cylinder by the intercooler rear outlet pipe is more, resulting in a lower gas temperature. At this time, the opening of the intercooler bypass valve is controlled to increase the gas delivered to the cylinder from the bypass connecting pipeline, increase the gas delivered to the cylinder, and increase the gas temperature delivered to the cylinder, thereby suppressing the condensation phenomenon by increasing the intake temperature.
[0078] In some embodiments of the present invention, the control method of the intercooler control system further includes: in response to the gas temperature reaching the dew point temperature, determining whether the difference between the gas temperature and the dew point temperature reaches a preset difference; in response to the difference between the gas temperature and the dew point temperature reaching the preset difference, controlling to reduce the opening of the intercooler bypass valve. The preset difference can be calibrated according to actual conditions.
[0079] Specifically, when the gas temperature reaches the dew point temperature, it means that the gas temperature is high. It is determined whether the difference between the gas temperature and the dew point temperature reaches the preset difference (such as 3°C). When the difference between the gas temperature and the dew point temperature reaches the preset difference, it means that the engine is prone to reduce the fit clearance between the moving parts due to the excessively high intake temperature, hindering the normal movement of the parts, and the amount of gas delivered to the cylinder by the exhaust pipe after the intercooler is less, resulting in a higher gas temperature. At this time, the opening of the intercooler bypass valve is controlled to reduce the gas delivered to the cylinder from the bypass connecting pipeline, reduce the gas temperature delivered to the cylinder, and thereby suppress the occurrence of knock by lowering the intake temperature.
[0080] As a specific example, Figure 3 As shown, the control method of the intercooler control system of the present invention may include the following steps:
[0081] S301, obtaining, through a controller, a first intake flow rate of filtered air, a first intake humidity of filtered air, an opening value of an EGR valve, a second intake flow rate of cooled circulating exhaust gas, and a second intake humidity of cooled circulating exhaust gas.
[0082] S302: Determine the dew point temperature at which the mixed gas condenses according to the first intake air flow rate, the first intake air humidity, the opening value, the second intake air flow rate, and the second intake air humidity.
[0083] S303, determining the bypass intercooler intake air volume of the bypass connecting pipeline according to the dew point temperature, the actual temperature of the mixed gas, the condensed water temperature of the intercooler, and a preset temperature difference threshold.
[0084] S304: determining a target opening value for the intercooler bypass valve according to the bypass intercooler intake air volume.
[0085] S305, controlling the opening of the intercooler bypass valve according to the target opening value to adjust the gas flow of the bypass connecting pipeline, and further adjust the gas flow entering the intercooler.
[0086] S306, obtaining, through a controller, the temperature of the gas delivered to the cylinder by the outlet pipe after the intercooler as measured by an intake temperature sensor disposed in the cylinder intake manifold.
[0087] S307, determine whether the gas temperature reaches the dew point temperature. If yes, execute step S309; if no, execute step S308.
[0088] S308, controlling to increase the opening of the intercooler bypass valve.
[0089] S309, determining whether the difference between the gas temperature and the dew point temperature reaches a preset difference. If yes, executing step S310.
[0090] S310, controlling to reduce the opening of the intercooler bypass valve.
[0091] In summary, according to the control method of the intercooler control system of an embodiment of the present invention, a first intake flow rate of filtered air, a first intake humidity of filtered air, an opening value of the EGR valve, a second intake flow rate of cooled circulating exhaust gas, and a second intake humidity of cooled circulating exhaust gas are obtained through a controller, and the dew point temperature at which the mixed gas condenses is determined according to the first intake flow rate, the first intake humidity, the opening value, the second intake flow rate, and the second intake humidity; wherein the mixed gas is obtained by mixing and supercharging the filtered air and the cooled circulating exhaust gas, and the bypass intercooler intake amount of the bypass connecting pipeline is determined according to the dew point temperature, the actual temperature of the mixed gas, the condensing water temperature of the intercooler, and a preset temperature difference threshold; wherein the temperature difference threshold represents the difference between the predetermined temperature of the gas in the intercooler rear outlet pipe of the intercooler and the condensing water temperature of the intercooler. Therefore, the method can calculate the required bypass gas volume based on the intercooler water temperature, the gas temperature before the intercooler, the gas quality, the moisture content, etc. by setting the intercooler bypass valve, and further adjust the closed loop according to the actual intake air temperature to adjust the opening of the intercooler bypass valve according to the required bypass gas volume. Under high humidity and low temperature conditions, the intercooler bypass valve allows part of the intake air to reach the intake pipe after the intercooler directly without passing through the intercooler. Due to the high flow rate and small specific heat of the gas, the gas temperature after the intercooler can be quickly adjusted by controlling the bypass valve to avoid the generation of condensed water and increase the temperature before the throttle valve to suppress the combustion abnormalities and fuel consumption deterioration caused by the generation of condensed water after the intercooler.
[0092] It should be noted that the method of the embodiment of the present invention can be performed by a single device, such as a computer or a server. The method of this embodiment can also be applied to a distributed scenario and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only perform one or more steps in the method of the embodiment of the present invention, and the multiple devices will interact with each other to complete the above method.
[0093] It should be noted that some embodiments of the present invention are described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
[0094] Corresponding to the above embodiment, the present invention further provides an electronic device.
[0095] refer to Figure 4 , is a block diagram of an electronic device according to some embodiments of the present invention, showing a more specific hardware structure diagram of an electronic device provided by this embodiment, the device may include: a processor 410, a memory 420, an input / output interface 430, a communication interface 440 and a bus 450. The processor 410, the memory 420, the input / output interface 430 and the communication interface 440 are connected to each other in communication within the device through the bus 450.
[0096] The processor 410 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.
[0097] The memory 420 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 420 may store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program codes are stored in the memory 420 and are called and executed by the processor 410.
[0098] The input / output interface 430 is used to connect the input / output module to realize information input and output. The input / output module can be configured in the device as a component (not shown in the figure), or it can be externally connected to the device to provide corresponding functions. The input device may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device may include a display, a speaker, a vibrator, an indicator light, etc.
[0099] The communication interface 440 is used to connect a communication module (not shown) to realize communication interaction between the device and other devices. The communication module can realize communication through a wired mode (such as USB, network cable, etc.) or a wireless mode (such as mobile network, WIFI, Bluetooth, etc.).
[0100] The bus 450 comprises a pathway for transmitting information between the various components of the device (eg, the processor 410, the memory 420, the input / output interface 430, and the communication interface 440).
[0101] It should be noted that, although the above device only shows the processor 410, the memory 420, the input / output interface 430, the communication interface 440 and the bus 450, in the specific implementation process, the device may also include other components necessary for normal operation. In addition, it can be understood by those skilled in the art that the above device may also only include the components necessary for implementing the embodiments of the present specification, and does not necessarily include all the components shown in the figure.
[0102] The electronic device of the above embodiment is used to implement the corresponding method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.
[0103] Based on the same inventive concept, corresponding to the method of any of the above embodiments, the present invention further provides a computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable a computer to execute the method of any of the above embodiments.
[0104] The above-mentioned computer-readable storage medium can be any available medium or data storage device that can be accessed by a computer, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (such as CD, DVD, BD, HVD, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NANDFLASH), solid-state drive (SSD)), etc.
[0105] The computer instructions stored in the storage medium of the above embodiment are used to enable a computer to execute the method of any embodiment in the above exemplary method part, and have the beneficial effects of the corresponding method embodiment, which will not be repeated here.
[0106] Based on the same inventive concept, corresponding to the method of any of the above embodiments, the present invention further provides an engine assembly, including the above intercooler control system, and the above intercooler control system is used to execute the above intercooler control method.
[0107] Corresponding to the above embodiment, the present invention also provides a vehicle.
[0108] refer to Figure 5 , is a block diagram of a vehicle according to some embodiments of the present invention, wherein the vehicle 500 includes the engine assembly described above.
[0109] In addition, although the operations of the method of the present invention are described in a specific order in the accompanying drawings, this does not require or imply that the operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired results. On the contrary, the steps depicted in the flow chart can be performed in a different order. Additionally or alternatively, some steps can be omitted, multiple steps can be combined into one step, and / or one step can be decomposed into multiple steps.
[0110] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.
[0111] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0112] Although the spirit and principle of the present invention have been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the disclosed specific embodiments, and the division of various aspects does not mean that the features in these aspects cannot be combined to benefit, and this division is only for the convenience of expression. The present invention is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the attached claims. The scope of the attached claims conforms to the broadest interpretation, thereby including all such modifications and equivalent structures and functions.
Claims
1. An intercooler control system, characterized in that: include: An intercooler (4), wherein a flow inlet of the intercooler (4) is provided with an intercooler front air intake pipe (16), and a flow outlet of the intercooler (4) is provided with an intercooler rear air outlet pipe (17); A cylinder air intake manifold (6), wherein the cylinder air intake manifold (6) is connected to the intercooler (4) through the intercooler rear air outlet pipe (17); A bypass connecting pipeline (15) is provided with an intercooler bypass valve (14), wherein an air inlet of the bypass connecting pipeline (15) is selectively connected to the intercooler front air intake pipe (16), and an air outlet of the bypass connecting pipeline (15) is selectively connected to the intercooler rear air outlet pipe (17); A controller is used to control the opening of the intercooler bypass valve (14) according to the bypass intercooler intake volume of the bypass connecting pipeline (15).
2. The intercooler control system according to claim 1, characterized in that: Also includes: A compressor (3), the compressor (3) being connected to the intercooler (4) through the intercooler front intake pipe (16), the compressor (3) being used for mixing and supercharging the circulating exhaust gas delivered by the EGR cooler (12) and the air delivered by the air filter (1), and delivering the mixed and supercharged mixed gas to the intercooler front intake pipe (16); An EGR cooler (12), an EGR valve (13) being arranged between the EGR cooler (12) and the compressor (3), the EGR cooler (12) being selectively connected to the compressor (3), and the EGR cooler (12) being used to provide cooled circulating exhaust gas to the compressor (3); An air filter (1), wherein a mixing valve (2) is provided between the air filter (1) and the compressor (3), the air filter (1) and the compressor (3) are selectively connected, and the air filter (1) is used to provide filtered air to the compressor (3).
3. The intercooler control system according to claim 2, characterized in that: Also includes: An air flow sensor is arranged at the air outlet of the air filter (1), and is used to measure a first intake air flow and a first intake air humidity of the filtered air, and send the first intake air flow and the first intake air humidity to the controller; wherein the first intake air flow and the first intake air humidity are used to calculate the bypass intercooler intake air volume.
4. The intercooler control system according to claim 1, characterized in that: Also includes: An intake air temperature sensor is arranged in the cylinder intake manifold (6), and is used to measure the temperature of the gas delivered to the cylinder (7) by the intercooler rear outlet pipe (17), and send the gas temperature to the controller; wherein the gas temperature is used to adjust the opening of the intercooler bypass valve (14).
5. A control method for an intercooler control system, characterized in that: The intercooler control system according to any one of claims 1 to 4 comprises: Obtaining, by means of a controller, a first intake flow rate of filtered air, a first intake humidity of filtered air, an opening value of an EGR valve, a second intake flow rate of cooled circulating exhaust gas, and a second intake humidity of cooled circulating exhaust gas; Determining the dew point temperature at which the mixed gas condenses according to the first intake air flow rate, the first intake air humidity, the opening value, the second intake air flow rate, and the second intake air humidity; wherein the mixed gas is obtained by mixing and pressurizing filtered air and cooled circulating exhaust gas; The bypass intercooler intake volume of the bypass connecting pipeline is determined according to the dew point temperature, the actual temperature of the mixed gas, the condensing water temperature of the intercooler, and a preset temperature difference threshold; wherein the temperature difference threshold represents the difference between the predetermined temperature of the gas in the intercooler rear outlet pipe of the intercooler and the condensing water temperature of the intercooler.
6. The control method of the intercooler control system according to claim 5, characterized in that: The determining the dew point temperature at which the mixed gas condenses according to the first intake air flow rate, the first intake air humidity, the opening value, the second intake air flow rate, and the second intake air humidity includes: According to the first intake air flow rate and the first intake air humidity, a saturated air moisture content table is searched to determine a first water vapor mass of the water vapor passing through the mixing valve; determining a second water vapor mass of water vapor passing through the EGR valve according to the opening value, the second intake air flow rate, and the second intake air humidity; determining a total mass of the mixed gas according to the first intake air flow rate and the second intake air flow rate; Determining a total content of water vapor in the mixed gas according to the first water vapor mass and the second water vapor mass; The dew point temperature at which the mixed gas condenses is determined according to the total mass of the mixed gas and the total content of water vapor in the mixed gas.
7. The control method of the intercooler control system according to claim 6, characterized in that: The step of determining the bypass intercooler intake air volume of the bypass connecting pipeline according to the dew point temperature, the actual temperature of the mixed gas, the condensed water temperature of the intercooler, and a preset temperature difference threshold comprises: Wherein, mp is the bypass intercooler intake volume of the bypass connecting pipeline, mz is the total mass of the mixed gas, mzh is the total content of water vapor in the mixed gas, T L is the dew point temperature, T in is the actual temperature of the mixed gas, T W is the condensing water temperature of the intercooler, and ΔT is the preset temperature difference threshold.
8. The control method of the intercooler control system according to claim 5, characterized in that: The method further comprises: determining a target opening value for an intercooler bypass valve according to the bypass intercooler intake air volume; The opening of the intercooler bypass valve is controlled according to the target opening value to adjust the gas flow of the bypass connecting pipeline, thereby adjusting the gas flow entering the intercooler.
9. The control method of the intercooler control system according to claim 8, characterized in that: Also includes: The controller obtains the temperature of the gas delivered to the cylinder by the outlet pipe after the intercooler as measured by the intake temperature sensor arranged in the cylinder intake manifold; It is determined whether the gas temperature has reached the dew point temperature, and in response to the gas temperature not reaching the dew point temperature, the opening of the intercooler bypass valve is controlled to be increased.
10. The control method of the intercooler control system according to claim 9, characterized in that: Also includes: In response to the gas temperature reaching the dew point temperature, determining whether a difference between the gas temperature and the dew point temperature reaches a preset difference; In response to a difference between the gas temperature and the dew point temperature reaching a preset difference, controlling to reduce an opening of the intercooler bypass valve.
11. An electronic device, characterized in that: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the control method of the intercooler control system as described in any one of claims 5 to 10 when executing the program.
12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the control method of the intercooler control system according to any one of claims 5-10.
13. An engine assembly, characterized in that: It comprises the intercooler control system as claimed in any one of claims 1 to 4, and the intercooler control system is used to execute the control method of the intercooler control system as claimed in any one of claims 5 to 10.
14. A vehicle, characterized in that: Includes the engine assembly as described in claim 13.