Control method and control device of exhaust gas recirculation valve and vehicle

Abstract

The invention provides a control method and device for an exhaust gas recirculation valve and a vehicle. The control method comprises the steps that the environment temperature after the vehicle is powered on is obtained; if the environment temperature is not smaller than the calibration temperature, the exhaust gas recirculation valve is controlled to be in an enabling mode; if the environment temperature is smaller than the calibration temperature, vehicle parameters after the vehicle is powered on are obtained, and whether the exhaust gas recirculation valve meets the enabling condition or not is determined based on the vehicle parameters; wherein the calibration temperature is not less than the dew point temperature of the waste gas. According to the control method of the exhaust gas recirculation valve, when the environment temperature is not smaller than the calibration temperature, it is ensured that exhaust gas cannot be condensed when the exhaust gas recirculation valve is in the enabling mode, and when the environment temperature is smaller than the calibration temperature, whether the exhaust gas recirculation valve is enabled or not is determined by further obtaining the vehicle parameters and conducting comprehensive judgment, so that the control accuracy of the exhaust gas recirculation valve is improved. In this way, whether the exhaust gas recirculation valve is started or not can be determined more flexibly, and the risk of corrosion failure of the exhaust gas recirculation valve caused by inferior gasoline introduced into a vehicle and the like is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle control, and particularly relates to a control method and a control device for an exhaust gas recirculation valve, and a vehicle. Background Art

[0002] Exhaust Gas Recirculation (EGR) technology is a key technology for energy conservation and emission reduction of vehicle engines. By reintroducing a part of the engine exhaust gas into the intake system, mixing it with fresh air and fuel, and then entering the combustion chamber for combustion again, the maximum combustion temperature of the engine is reduced, so as to reduce the nitrogen oxide emissions in the exhaust gas and improve the fuel economy under partial load conditions. The exhaust gas recirculation valve is a key component to realize exhaust gas recirculation, and is responsible for controlling the amount of exhaust gas returned from the exhaust system to the intake system. The exhaust gas recirculation valve is constantly scoured by combustion exhaust gas containing complex components, and is prone to failure. Especially when inferior gasoline with unqualified relevant indicators or fuel additives with uneven quality is added to the vehicle, it will inevitably cause the exhaust gas recirculation valve to corrode and fail.

[0003] In the related art, in order to reduce the probability of corrosion and failure of the exhaust gas recirculation valve, materials with a higher corrosion resistance level are used to manufacture the exhaust gas recirculation control valve, or an auxiliary mechanism is added to heat the valve body of the exhaust gas recirculation valve, but this will increase the cost and the structural complexity. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a control method and a control device for an exhaust gas recirculation valve, and a vehicle, so as to avoid the risk of corrosion and failure of the exhaust gas recirculation valve caused by inferior gasoline without increasing the cost and the structural complexity.

[0005] In order to achieve the above purpose, an embodiment of the present application provides a control method for an exhaust gas recirculation valve, which is used for a vehicle. The control method includes:

[0006] Obtain the ambient temperature after the vehicle is powered on;

[0007] If the ambient temperature is not less than the calibrated temperature, control the exhaust gas recirculation valve to be in the enabled mode;

[0008] If the ambient temperature is less than the calibrated temperature, obtain the vehicle parameters after the vehicle is powered on, and based on the vehicle parameters, determine whether the exhaust gas recirculation valve meets the enabling conditions;

[0009] Wherein, the calibrated temperature is not less than the dew point temperature of the exhaust gas.

[0010] In some embodiments, the obtaining of the vehicle parameters after the vehicle is powered on includes: obtaining the coolant temperature after the vehicle engine is started for the first time;

[0011] Determining whether the exhaust gas recirculation valve meets the enabling condition based on the vehicle parameters includes:

[0012] Comparing the coolant temperature with a first preset temperature;

[0013] Wherein, the first preset temperature is: the minimum temperature of the coolant calibrated to be able to heat the valve body temperature of the exhaust gas recirculation valve to not less than the dew point temperature of the exhaust gas.

[0014] In some embodiments, if the coolant temperature is not less than the first preset temperature, it is determined that the exhaust gas recirculation valve meets the enabling condition, and the exhaust gas recirculation valve is controlled to be in the enabling mode.

[0015] In some embodiments, if the coolant temperature is less than the first preset temperature, it is determined that the exhaust gas recirculation valve does not meet the enabling condition, and the exhaust gas recirculation valve is controlled to be delayed in enabling for a first preset duration;

[0016] Wherein, the first preset duration is: the minimum duration required for the valve body temperature of the exhaust gas recirculation valve to be heated by the engine coolant introduced into the cooler of the exhaust gas recirculation valve to exceed the dew point temperature of the exhaust gas.

[0017] In some embodiments, before controlling the exhaust gas recirculation valve to be delayed in enabling for a first preset duration, the control method includes:

[0018] Determining the operating state of the vehicle;

[0019] If the vehicle is in the power-off state, control the exhaust gas recirculation valve to exit the delayed enabling;

[0020] If the vehicle is always in the power-on state, after controlling the exhaust gas recirculation valve to be delayed in enabling for a first preset duration, control the exhaust gas recirculation valve to be in the enabling mode.

[0021] In some embodiments, the control method includes:

[0022] After controlling the exhaust gas recirculation valve to be delayed in enabling for a first preset duration, obtain the real-time valve body temperature of the exhaust gas recirculation valve;

[0023] Compare the real-time valve body temperature with the dew point temperature of the exhaust gas.

[0024] In some embodiments, obtaining the real-time valve body temperature of the exhaust gas recirculation valve includes:

[0025] Obtaining the real-time temperature of the coolant of the engine;

[0026] Based on the real-time temperature of the engine coolant, obtain the real-time valve body temperature of the exhaust gas recirculation valve.

[0027] In some embodiments, the control method includes:

[0028] If the real-time valve body temperature is not less than the dew point temperature of the exhaust gas, control the exhaust gas recirculation valve to remain in the enabled mode.

[0029] In some embodiments, the control method includes:

[0030] If the real-time valve body temperature is less than the dew point temperature of the exhaust gas, control the exhaust gas recirculation valve to switch from the enabled mode to the disabled mode;

[0031] After controlling the exhaust gas recirculation valve to be in the disabled mode for a second preset duration, switch it to the enabled mode;

[0032] Wherein, the second preset duration is: the minimum duration required for the valve body temperature of the exhaust gas recirculation valve to continue to be heated by the engine coolant introduced into the cooler of the exhaust gas recirculation valve to exceed the dew point temperature.

[0033] In some embodiments, the second preset duration is less than the first preset duration.

[0034] In some embodiments, the first preset duration is not less than three minutes; and / or, the second preset duration is not less than two minutes.

[0035] In some embodiments, the dew point temperature is less than 40°C.

[0036] In some embodiments, the first preset temperature is not less than 60°C.

[0037] Another embodiment of the present application provides a control device for an exhaust gas recirculation valve, which applies the control method described in any embodiment of the present application. The control device includes:

[0038] An acquisition module, which is at least used to acquire the ambient temperature of the vehicle, the coolant temperature after the engine is first started, and the real-time valve body temperature of the exhaust gas recirculation valve;

[0039] A determination module, which is used to determine whether the ambient temperature is greater than the calibrated temperature, whether the coolant temperature after the engine is first started is greater than the first preset temperature; and to determine whether the real-time valve body temperature of the exhaust gas recirculation valve is greater than the dew point temperature of the exhaust gas;

[0040] A control module, which is used to control the exhaust gas recirculation valve to be in the enabled mode or delay enabling based on the comparison information of the determination module.

[0041] Yet another embodiment of the present application provides a vehicle, comprising the control device for the exhaust gas recirculation valve described in any embodiment of the present application, the vehicle comprising an engine and an exhaust gas recirculation valve, the exhaust gas recirculation valve comprising a valve body and a cooler connected to each other, a coolant flow channel being provided between the cooler and the engine, the coolant of the engine flowing to the cooler through the coolant flow channel to heat the valve body through the cooler.

[0042] The control method of the exhaust gas recirculation valve provided in the embodiment of the present application can compare the ambient temperature with the calibration temperature after the vehicle is powered on. When the ambient temperature is not less than the calibration temperature, it can ensure that the exhaust gas will not condense when the exhaust gas recirculation valve is in the enable mode, effectively reducing the damage caused by the exhaust gas condensation to the exhaust gas recirculation valve. When the ambient temperature is less than the calibration temperature, the exhaust gas recirculation valve is enabled by further obtaining vehicle parameters and making a comprehensive judgment. In this way, it can be more flexible to decide whether to enable the exhaust gas recirculation valve, rather than simply prohibiting its use, thereby reducing the risk of corrosion failure of the exhaust gas recirculation valve caused by the introduction of inferior gasoline into the vehicle. At the same time, the ambient temperature can be obtained by the ambient temperature sensor of the vehicle itself, without the need to set up an additional sensor. Of course, there is no need to use a more corrosion-resistant material or add an auxiliary mechanism for the exhaust gas recirculation valve, that is, the control method of the embodiment of the present application does not need to improve the structure of the exhaust gas recirculation valve, and has low cost and high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of a method for controlling an exhaust gas recirculation valve according to an embodiment of the present application;

[0044] Figure 2 A schematic flow chart of a method for controlling an exhaust gas recirculation valve according to an application embodiment of the present application;

[0045] Figure 3 This is a schematic diagram of the coordination principle between the exhaust gas recirculation valve and the engine according to an embodiment of the present application, wherein the solid arrow represents the coolant flow direction, and the dotted arrow represents the gas flow direction.

[0046] Among them, 1-valve body; 2-cooler; 3-coolant flow path; 4-intake manifold. DETAILED DESCRIPTION

[0047] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for explaining the present invention, rather than limiting the protection scope of the present invention.

[0048] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0049] An embodiment of the present application provides a control method for an exhaust gas recirculation valve, which is used for a vehicle.

[0050] Please refer to Figure 1 , the control method includes:

[0051] Step S101: Obtain the ambient temperature after the vehicle is powered on.

[0052] Step S102: If the ambient temperature is not less than the calibrated temperature, control the exhaust gas recirculation valve to be in the enabled mode.

[0053] Step S103: If the ambient temperature is less than the calibrated temperature, obtain the vehicle parameters after the vehicle is powered on, and based on the vehicle parameters, determine whether the exhaust gas recirculation valve meets the enabling conditions.

[0054] Wherein, the calibrated temperature is not less than the dew point temperature of the exhaust gas.

[0055] Here, the ambient temperature can be the atmospheric temperature, that is, the air temperature around the vehicle. The ambient temperature can be obtained by an ambient temperature sensor installed on the vehicle.

[0056] Here, when the vehicle is powered on, it means that the electrical system of the vehicle is connected to the power supply, enabling the vehicle's electronic devices and systems to enter the working or standby state. This does not mean that the engine has started, but rather that the on-vehicle battery supplies power to various electrical appliances, sensors, control units, entertainment systems, etc. of the vehicle, enabling them to start operating or be ready.

[0057] Exemplarily, when the vehicle is in the ACC (Accessory) mode, some electrical devices such as radios and interior lighting can be used, but the engine is still in the off state.

[0058] When the vehicle is in the IGN (Ignition) mode, more electrical systems are activated, and all systems required to start the engine, such as the engine control unit, can be powered.

[0059] When the vehicle is in the START mode, the engine starts. Once the engine starts running on its own and the key or start button is released, it returns to the IGN mode.

[0060] Exhaust gas refers to the gas emitted after the combustion process of the vehicle's internal combustion engine. Exhaust gas includes nitrogen, oxygen, nitrogen oxides, etc. When the vehicle uses gasoline with an excessive chlorine content, chlorine will also be contained in the exhaust gas.

[0061] The exhaust gas recirculation valve reduces the formation of nitrogen oxides by reintroducing a portion of the exhaust gas back into the intake system and entering the combustion chamber together with the fresh air-fuel mixture, thereby reducing the combustion temperature. Since nitrogen oxides are formed under high-temperature conditions, introducing exhaust gas can effectively reduce the maximum temperature in the combustion chamber. The exhaust gas recirculation valve can help improve fuel economy and reduce the emission of other pollutants.

[0062] The enabled mode refers to the state in which the exhaust gas recirculation valve is activated and starts to work. At this time, the exhaust gas recirculation valve can adjust the amount of exhaust gas returning from the exhaust system to the intake system according to the engine's operating conditions and control logic, thereby reducing the formation of nitrogen oxides.

[0063] The dew point temperature refers to the temperature at which the water vapor in the exhaust gas begins to condense into liquid water. If the exhaust gas temperature is lower than the dew point temperature, the water vapor will condense into water, and the condensed water will cause corrosion to the exhaust gas recirculation valve. For example, when the vehicle adds and uses gasoline with an excessive chlorine content (national standards require that gasoline should not contain chlorine), when the chlorine-containing exhaust gas combines with the condensed water in the valve body of the exhaust gas recirculation valve, a highly corrosive electrolyte solution will be formed, causing corrosion to the valve body. After the corrosion products peel off, they will enter the bearing of the exhaust gas recirculation valve, resulting in the exhaust gas recirculation valve being stuck and the function of the exhaust gas recirculation valve failing.

[0064] Therefore, in this embodiment, the calibration temperature is not less than the dew point temperature of the exhaust gas. When the ambient temperature is higher than the calibration temperature, it means that the exhaust gas entering the exhaust gas recirculation valve will not condense due to too low a temperature, and the exhaust gas will not condense inside the exhaust gas recirculation valve. Thus, the exhaust gas recirculation valve has no risk of corrosion and failure, and the exhaust gas recirculation valve can be in the enabled mode after the vehicle is powered on to perform exhaust gas recirculation.

[0065] It should be noted that the calibration temperature is a value set with reference to the dew point temperature of the exhaust gas, which does not mean that the calibration temperature is the dew point temperature of the exhaust gas. The calibration temperature is a temperature that ensures that the exhaust gas recirculation valve can stably recirculate the exhaust gas without being corroded after the vehicle is powered on. The calibration temperature can be equal to the dew point temperature of the exhaust gas or greater than the dew point temperature of the exhaust gas. The calibration temperature can be obtained through multiple tests.

[0066] Exemplarily, the calibration temperature is greater than the dew point temperature of the exhaust gas. The ratio of the calibration temperature to the dew point temperature of the exhaust gas can be 1.1, 1.15, 1.2, 1.25, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, etc., which is not limited here.

[0067] If the ambient temperature is lower than the calibration temperature, the ambient temperature is not necessarily lower than the dew point temperature of the exhaust gas, and the ambient temperature alone is not sufficient to determine whether the exhaust gas recirculation valve can be in the enable mode. Therefore, at this time, it is necessary to obtain the vehicle parameters after the vehicle is powered on, so as to determine whether the exhaust gas recirculation valve can be enabled according to the vehicle parameters.

[0068] Here, the vehicle parameters may include the valve body temperature of the exhaust gas recirculation valve, the coolant temperature after the engine is started for the first time, the temperature of the cooler of the exhaust gas recirculation valve, etc. In this way, based on this, the state of the exhaust gas recirculation valve is further determined to determine whether it can be enabled.

[0069] The control method of the exhaust gas recirculation valve provided in the embodiment of the present application can compare the ambient temperature with the calibration temperature after the vehicle is powered on. When the ambient temperature is not less than the calibration temperature, it can ensure that the exhaust gas will not condense when the exhaust gas recirculation valve is in the enable mode, effectively reducing the damage caused by the exhaust gas condensation to the exhaust gas recirculation valve. When the ambient temperature is less than the calibration temperature, the exhaust gas recirculation valve is enabled by further obtaining vehicle parameters and making a comprehensive judgment. In this way, it can be more flexible to decide whether to enable the exhaust gas recirculation valve, rather than simply prohibiting its use, thereby reducing the risk of corrosion failure of the exhaust gas recirculation valve caused by the introduction of inferior gasoline into the vehicle. At the same time, the ambient temperature can be obtained by the ambient temperature sensor of the vehicle itself, without the need to set up an additional sensor. Of course, there is no need to use a more corrosion-resistant material or add an auxiliary mechanism for the exhaust gas recirculation valve, that is, the control method of the embodiment of the present application does not need to improve the structure of the exhaust gas recirculation valve, and has low cost and high practicality.

[0070] In some embodiments, obtaining vehicle parameters after the vehicle is powered on includes: obtaining a coolant temperature after the vehicle engine is started for the first time.

[0071] Based on the vehicle parameters, determining whether the exhaust gas recirculation valve meets the enabling condition includes: comparing the coolant temperature with a first preset temperature.

[0072] Wherein, the first preset temperature is the minimum temperature of the coolant required to heat the valve body temperature of the exhaust gas recirculation valve to not less than the dew point temperature of the exhaust gas as calibrated.

[0073] Here, the coolant temperature after the engine is first started is the temperature of the coolant read after the vehicle starts the engine, which reflects the state of the engine during cold start. The coolant is also called antifreeze or radiator fluid, and the coolant can include water, ethylene glycol or propylene glycol, preservatives, antifoaming agents, etc.

[0074] It can be understood that when the engine is cold started, the coolant temperature is relatively low, and at this time the engine needs some time to reach the optimal working temperature. Therefore, by obtaining the coolant temperature after the engine is first started, the warm-up state of the engine can be evaluated, and it helps to confirm whether the exhaust gas recirculation valve meets the enabling conditions.

[0075] The coolant temperature after the engine is first started can be obtained through the built-in coolant temperature sensor.

[0076] It can be understood that there is a coolant flow channel between the cooler of the exhaust gas recirculation valve and the coolant of the engine. The coolant of the engine can flow to the cooler through the coolant flow channel, and the cooler is connected to the exhaust gas recirculation valve. Exemplarily, the cooler is integrally formed with the valve body of the exhaust gas recirculation valve. The heat of the coolant of the engine is transferred to the valve body of the exhaust gas recirculation valve through the cooler, that is, the heating of the valve body is achieved through the body heat conduction between two solids, so that the valve body temperature of the exhaust gas recirculation valve rises.

[0077] The first preset temperature is the minimum temperature of the coolant required to heat the valve body temperature of the exhaust gas recirculation valve to not less than the dew point temperature of the exhaust gas as calibrated. That is to say, the setting basis of the first preset temperature is to ensure that the valve body temperature of the exhaust gas recirculation valve can be heated to not lower than the dew point temperature of the exhaust gas, which is the lowest value that the coolant temperature must reach, so that the valve body of the exhaust gas recirculation valve is heated to higher than the dew point temperature of the exhaust gas. The first preset temperature can be obtained through experiments or calculations.

[0078] In this way, by comparing the coolant temperature after the engine is first started with the first preset temperature, it is confirmed whether the valve body of the exhaust gas recirculation valve has sufficient thermal conditions and will not cause the exhaust gas to condense, so as to confirm whether the exhaust gas recirculation valve meets the enabling conditions.

[0079] In this embodiment, when the ambient temperature is less than the calibrated temperature, based on the comparison of the coolant temperature after the engine is first started with the first preset temperature, it is confirmed whether the exhaust gas recirculation valve meets the enabling conditions, and then the exhaust gas recirculation is enabled or closed, which can reduce the corrosion and condensation phenomenon of the exhaust gas recirculation valve, and there is no need to additionally install a sensor on the valve body, and the control cost is low.

[0080] In some embodiments, if the coolant temperature is not less than the first preset temperature, it is determined that the exhaust gas recirculation valve meets the enabling condition, and the exhaust gas recirculation valve is controlled to be in the enabling mode.

[0081] Here, when the coolant temperature after the engine is first started is not less than the first preset temperature, it indicates that the coolant after the engine is first started can provide sufficient thermal conditions for the valve body of the exhaust gas recirculation valve, preventing the exhaust gas from condensing and thus preventing the exhaust gas recirculation valve from corroding and failing. At this time, the exhaust gas recirculation valve meets the enabling condition and can be in the enabling mode for exhaust gas recirculation.

[0082] In this embodiment, the coolant temperature after the engine is first started is used as an indirect indicator of the thermal state of the exhaust gas recirculation valve, ensuring that the activation of the exhaust gas recirculation valve is both safe and efficient. It can avoid condensation problems caused by low temperatures, optimize the combustion process and emission control effects, and has high reliability.

[0083] In some embodiments, if the coolant temperature is less than the first preset temperature, it is determined that the exhaust gas recirculation valve does not meet the enabling condition, and the exhaust gas recirculation valve is controlled to be delayed in enabling for a first preset duration.

[0084] Wherein, the first preset duration is the minimum duration for the valve body temperature of the exhaust gas recirculation valve to be heated by the engine coolant flowing into the cooler of the exhaust gas recirculation valve to exceed the dew point temperature of the exhaust gas.

[0085] Here, when the coolant temperature after the engine is first started is less than the first preset temperature, that is, the coolant temperature of the engine cannot make the valve body temperature of the exhaust gas recirculation valve greater than the dew point temperature. At this time, if the exhaust gas recirculation valve is in the enabling mode, the water vapor in the exhaust gas may condense and corrode the valve body, causing the exhaust gas recirculation valve to malfunction.

[0086] Therefore, in this embodiment, when the coolant temperature after the engine is first started is less than the first preset temperature, the exhaust gas recirculation valve is delayed in enabling for the first preset duration, so that the valve body temperature of the exhaust gas recirculation valve can be heated by the engine coolant flowing into the cooler of the exhaust gas recirculation valve to exceed the dew point temperature of the exhaust gas, thereby avoiding the risk of condensation corrosion.

[0087] The first preset duration represents the minimum time required from the current state to heat the valve body temperature of the exhaust gas recirculation valve to not less than the dew point temperature of the exhaust gas. During this time, the engine runs, the coolant gradually warms up, and transfers heat to the cooler, and the cooler then transfers the heat to the valve body of the exhaust gas recirculation valve to gradually raise the valve body temperature to not less than the dew point temperature of the exhaust gas.

[0088] In some embodiments, before controlling the exhaust gas recirculation valve to be delayed in enabling for the first preset duration, the control method includes:

[0089] Determine the operating state of the vehicle.

[0090] If the vehicle is in the power-off state, control the exhaust gas recirculation valve to exit the delayed enablement.

[0091] If the vehicle is always in the power-on state, after controlling the exhaust gas recirculation valve to be delayed enabled for a first preset duration, control the exhaust gas recirculation valve to be in the enabled mode.

[0092] That is to say, when deciding whether to delay the enablement of the exhaust gas recirculation valve, the operating state of the vehicle will be determined first. If the vehicle is in the power-off state, that is, the vehicle is turned off. At this time, the engine stops working, the coolant is no longer heated, and it is not necessary to execute the delayed enablement logic of the exhaust gas recirculation valve. If the vehicle remains in the power-on state and the engine is running, and the coolant temperature cannot yet make the valve body temperature of the exhaust gas recirculation valve exceed the dew point temperature of the exhaust gas, at this time, it is necessary to perform delayed enablement according to the predetermined first preset duration. After the first preset duration, the valve body temperature of the exhaust gas recirculation valve exceeds the dew point temperature of the exhaust gas, and normal exhaust gas recirculation can be carried out without condensation corrosion.

[0093] In this embodiment, determining the operating state of the vehicle before controlling the exhaust gas recirculation valve to be delayed enabled for the first preset duration can reduce unnecessary operations. When the vehicle is in the power-off state, making the exhaust gas recirculation valve exit the delayed enablement can reduce potential incorrect operations; only when the vehicle is in a continuous power-on state and the exhaust gas recirculation valve does not meet the thermal conditions for enabling, it is necessary to delay the enablement. Within the first preset duration, under the action of the engine coolant and cooler, it is heated to exceed the dew point temperature of the exhaust gas. In this embodiment, the delayed enablement strategy of the exhaust gas recirculation can be executed more intelligently and reliably.

[0094] In some embodiments, the control method includes:

[0095] After controlling the exhaust gas recirculation valve to be delayed enabled for the first preset duration, obtain the real-time valve body temperature of the exhaust gas recirculation valve.

[0096] Compare the real-time valve body temperature with the dew point temperature of the exhaust gas.

[0097] Here, after controlling the exhaust gas recirculation valve to be delayed enabled for the first preset duration, the exhaust gas recirculation valve is in the enabled mode and the exhaust gas recirculation valve is in the working state. At this time, obtaining the real-time valve body temperature of the exhaust gas recirculation valve is to monitor the real-time valve body temperature of the exhaust gas recirculation valve.

[0098] Then compare the real-time valve body temperature with the dew point temperature of the exhaust gas to confirm in real time whether there is a risk of condensation corrosion in the exhaust gas recirculation. In this way, the failure risk of the exhaust gas recirculation valve can be further reduced.

[0099] It can be understood that when the hybrid vehicle is in use, after the coolant temperature exceeds the first preset temperature after the engine is first started after power-on, during subsequent driving, the engine may remain shut down and rely on pure electricity for driving. At this time, the real-time temperature of the engine coolant may drop below the dew point temperature of the exhaust gas and then the engine is started again. In this way, it is inevitable that the exhaust gas condenses in the exhaust gas recirculation valve, causing the exhaust gas recirculation valve to corrode and fail.

[0100] Therefore, in this embodiment, after the coolant temperature reaches the first preset temperature after the engine is first started, the real-time valve body temperature of the exhaust gas recirculation valve is still monitored to cope with the different thermal states of the exhaust gas recirculation valve under different conditions of the vehicle, and to avoid the risk of corrosion and failure of the exhaust gas recirculation in various situations.

[0101] There is no limit to the method of obtaining the real-time valve body temperature of the exhaust gas recirculation valve.

[0102] In some embodiments, obtaining the real-time valve body temperature of the exhaust gas recirculation valve includes:

[0103] Obtaining the real-time temperature of the coolant of the engine.

[0104] Based on the real-time temperature of the coolant of the engine, obtain the real-time valve body temperature of the exhaust gas recirculation valve.

[0105] It can be understood that after the valve body of the exhaust gas recirculation valve is heated by the cooperation of the coolant and the cooler after the engine is first started, when the exhaust gas recirculation valve is in the enabled mode, the real-time valve body temperature of the exhaust gas recirculation valve can be characterized by the real-time temperature of the coolant of the engine. In this way, there is no need to additionally set a temperature sensor on the exhaust gas recirculation valve, reducing costs.

[0106] That is, in this case, if the real-time temperature of the coolant of the engine is not lower than the dew point temperature of the exhaust gas, it means that the real-time valve body temperature of the exhaust gas recirculation valve is higher than the dew point temperature of the exhaust gas, and there is no risk of condensation corrosion. If the real-time temperature of the coolant of the engine is lower than the dew point temperature of the exhaust gas, it means that the real-time valve body temperature of the exhaust gas recirculation valve is lower than the dew point temperature of the exhaust gas, and there is a risk of condensation corrosion.

[0107] In this embodiment, by obtaining the real-time temperature of the coolant of the engine, the real-time valve body temperature of the exhaust gas recirculation valve is obtained, and the real-time temperature of the exhaust gas recirculation valve is monitored after the vehicle is powered on and the exhaust gas recirculation valve is enabled, increasing the control reliability and without increasing additional tool costs.

[0108] In some embodiments, the control method includes:

[0109] If the real-time valve body temperature is not less than the dew point temperature of the exhaust gas, control the exhaust gas recirculation valve to maintain the enabled mode.

[0110] Here, if the real-time valve body temperature is not less than the dew point temperature of the exhaust gas, it indicates that there is no risk of corrosion failure of the exhaust gas recirculation valve, and the exhaust gas recirculation can maintain the enabled mode to save energy and reduce emissions for the vehicle and reduce the generation of nitrogen oxides.

[0111] In some embodiments, the control method includes:

[0112] If the real-time valve body temperature is less than the dew point temperature of the exhaust gas, then control the exhaust gas recirculation valve to switch from the enabled mode to the disabled mode.

[0113] After controlling the exhaust gas recirculation valve to be in the disabled mode for a second preset duration, then switch to the enabled mode.

[0114] Wherein, the second preset duration is: the minimum duration required for the valve body temperature of the exhaust gas recirculation valve to continue to be heated by the engine coolant introduced into the cooler of the exhaust gas recirculation valve to exceed the dew point temperature.

[0115] Here, if the real-time valve body temperature is less than the dew point temperature of the exhaust gas, it indicates that there is a risk of corrosion failure of the exhaust gas recirculation valve. At this time, control the exhaust gas recirculation valve to switch from the enabled mode to the disabled mode to stop the exhaust gas recirculation valve from working. Delay the enabling of the exhaust gas recirculation valve for a second preset duration and then enable it, that is, through the second preset duration, the valve body temperature of the exhaust gas recirculation valve can continue to be heated by the engine coolant introduced into the cooler of the exhaust gas recirculation valve to exceed the dew point temperature.

[0116] The second preset duration represents at least how much time is required to make the valve body temperature of the exhaust gas recirculation valve return to not less than the dew point temperature of the exhaust gas. During this period, the engine runs, the coolant gradually warms up, and transfers heat to the cooler, and the cooler then transfers the heat to the valve body of the exhaust gas recirculation valve to make the valve body temperature gradually rise to not less than the dew point temperature of the exhaust gas.

[0117] In some embodiments, the second preset duration is less than the first preset duration.

[0118] It can be understood that when enabling is delayed for the second time, the exhaust gas recirculation valve already has a certain heat basis. Therefore, heating it to exceed the dew point temperature of the exhaust gas takes less time than the first delay in enabling. Therefore, the second preset duration is less than the first preset duration.

[0119] In this embodiment, the setting of the second preset duration and the first preset duration can reduce the time of delayed enabling when the valve body temperature of the exhaust gas recirculation valve exceeds the dew point temperature of the exhaust gas, enabling the exhaust gas recirculation valve to work effectively, saving energy and reducing emissions for the vehicle, and reducing fuel consumption.

[0120] In some embodiments, the first preset duration t1 is not less than three minutes (min, Minute), i.e., t1≥3 min. Exemplarily, 3 min, 3.1 min, 3.3 min, 3.5 min, 3.6 min, 3.7 min, 3.9 min, 4 min, 4.2 min, 4.5 min, etc.

[0121] In this embodiment, the setting of the first preset duration can ensure that the exhaust gas recirculation valve is heated to exceed the dew point temperature of the exhaust gas, so that the exhaust gas will not condense. At the same time, the time is not too long, which is convenient for the operation of the exhaust gas recirculation valve, and energy conservation and emission reduction are achieved for the vehicle.

[0122] In some embodiments, the second preset duration t2 is not less than two minutes (min, Minute), i.e., t2≥2 min. Exemplarily, 2 min, 2.1 min, 2.2 min, 2.3 min, 2.4 min, 2.5 min, 2.6 min, 2.7 min, 2.8 min, 2.9 min, 3 min, etc.

[0123] In this embodiment, the setting of the second preset duration can ensure that the exhaust gas recirculation valve is heated to exceed the dew point temperature of the exhaust gas, so that the exhaust gas will not condense. At the same time, the time is not too long, which is convenient for the operation of the exhaust gas recirculation valve, and energy conservation and emission reduction are achieved for the vehicle.

[0124] In some embodiments, the dew point temperature T is less than 40 °C, i.e., T<40 °C. Exemplarily, 40 °C, 39 °C, 38 °C, 37 °C, 36 °C, 35 °C, 34 °C, 33 °C, 32 °C, 31 °C, 30 °C, etc.

[0125] The dew point temperature can be calculated from the humidity and temperature parameters of the exhaust gas. Of course, it can also be obtained through experimental instruments such as dew point meters and wet temperature sensor combinations, or through the look-up table method, which is not limited here.

[0126] The setting of the dew point temperature can be used as a reference value to set the calibration temperature and the first preset temperature to ensure that the exhaust gas recirculation valve is not damaged due to the condensation of the exhaust gas, and the control reliability is increased.

[0127] In some embodiments, the first preset temperature T1 is not less than 60 °C, i.e., T≥60 °C. Exemplarily, 60 °C, 63 °C, 65 °C, 68 °C, 70 °C, 72 °C, 74 °C, 75 °C, 77 °C, 79 °C, 80 °C, etc.

[0128] In this embodiment, the setting of the first preset temperature can ensure that the exhaust gas recirculation valve is heated to exceed the dew point temperature of the exhaust gas, so that the exhaust gas will not condense. At the same time, the temperature is not too high, reducing the first preset duration, which is convenient for the operation of the exhaust gas recirculation valve, and energy conservation and emission reduction are achieved for the vehicle.

[0129] Please refer to Figure 2 , and the control method of the exhaust gas recirculation valve in the present application will be described below in conjunction with a specific embodiment.

[0130] Step S201: Obtain the ambient temperature after the vehicle is powered on.

[0131] Step S202: Determine whether the ambient temperature is not less than the calibrated temperature.

[0132] Step S203: If so, control the exhaust gas recirculation valve to be in the enabled mode.

[0133] Step S204: If not, obtain the coolant temperature after the engine is first started after the vehicle is powered on.

[0134] Step S205: Determine whether the coolant temperature is not less than the first preset temperature.

[0135] Step S206: If so, determine that the exhaust gas recirculation valve meets the enabling condition, control the exhaust gas recirculation valve to be in the enabled mode, and return to step 203.

[0136] Step S207: If not, determine that the exhaust gas recirculation valve does not meet the enabling condition.

[0137] Step S208: Determine whether the vehicle is in the powered-on state.

[0138] Step S209: If so, control the exhaust gas recirculation valve to be enabled after a first preset duration of delay, and then control the exhaust gas recirculation valve to be in the enabled mode.

[0139] Step S210: If not, control the exhaust gas recirculation valve to exit the delayed enabling.

[0140] Step S211: After controlling the exhaust gas recirculation valve to be enabled after a first preset duration of delay, obtain the real-time temperature of the engine coolant.

[0141] Step S212: Determine whether the real-time temperature of the engine coolant is not less than the dew point temperature of the exhaust gas.

[0142] Step S213: If so, control the exhaust gas recirculation valve to maintain the enabled mode.

[0143] Step S214: If not, control the exhaust gas recirculation valve to switch from the enabled mode to the non-enabled mode, control the exhaust gas recirculation valve to be in the non-enabled mode for a second preset duration, and then switch to the enabled mode.

[0144] Another embodiment of the present application provides a control device for an exhaust gas recirculation valve, which applies the control method of any embodiment of the present application.

[0145] The control device includes an acquisition module, a determination module, and a control module.

[0146] It is understandable that the acquisition module, the determination module, and the control module can be independent hardware modules divided according to functions, or an integrated device with integrated functions. For different functional modules, whether they are individual modules or integrated devices, as long as they adopt the functions of the control device of the embodiment of the present application, they all fall within the protection scope of the present application.

[0147] The acquisition module is at least used to acquire the ambient temperature of the vehicle, the coolant temperature after the engine is started for the first time, and the real-time valve body temperature of the exhaust gas recirculation valve.

[0148] The determination module is used to determine whether the ambient temperature is greater than the calibrated temperature, whether the coolant temperature after the engine is started for the first time is greater than the first preset temperature; and to determine whether the real-time valve body temperature of the exhaust gas recirculation valve is greater than the dew point temperature.

[0149] The control module is used to control the exhaust gas recirculation valve to be in the enabled mode or delayed enabling based on the comparison information of the determination module.

[0150] Here, the acquisition module may include a vehicle ambient temperature sensor and an engine coolant sensor. The real-time valve body temperature of the exhaust gas recirculation valve can be characterized by the real-time temperature of the engine coolant.

[0151] The determination module can compare the detected temperature with the calibrated temperature. For example, compare the ambient temperature with the calibrated temperature, compare the coolant temperature after the engine is started for the first time with the first preset temperature, and compare the real-time valve body temperature of the exhaust gas recirculation valve with the dew point temperature.

[0152] The control module can control the exhaust gas recirculation valve to be in the enabled mode according to the comparison information, or delay enabling for the first preset duration, or delay enabling for the second preset duration.

[0153] In this way, the influence of the use of inferior gasoline on the exhaust gas recirculation valve can be avoided without increasing the cost.

[0154] Another embodiment of the present application provides a vehicle, including the control device of the exhaust gas recirculation valve of any embodiment of the present application.

[0155] The vehicle includes an engine and an exhaust gas recirculation valve. Please refer to Figure 3 , the exhaust gas recirculation valve includes a valve body 1 and a cooler 2 connected to each other. There is a coolant flow channel 3 between the cooler 2 and the engine. The coolant of the engine flows through the coolant flow channel 3 to the cooler 2 to heat the valve body 1 through the cooler 2.

[0156] Exemplarily, the engine is connected to the throttle body through the inlet end of the intake manifold 4 to receive fresh air filtered by the air filter or the air-fuel mixture formed by fuel injection, and the engine distributes the gas through the outlet end of the intake manifold 4.

[0157] That is to say, there is no need to additionally add a water flow channel between the coolant of the engine and the valve body to wrap the valve body with the water flow channel, which increases the additional cost. In this embodiment, the coolant of the engine can indirectly heat the valve body through the coolant flow channel between the engine and the cooler, reducing the risk of corrosion and failure of the exhaust gas recirculation valve.

[0158] It should be noted that the vehicle of the present application can be various vehicle models, such as a sedan, a commercial vehicle, a SUV or a sports utility vehicle, etc.

[0159] Certainly, an embodiment of the present application can also provide an electronic device, including a processor and a memory for storing computer services that can run on the processor. Among them, when the processor is used to run the computer service, any of the above control methods is implemented. It can be understood that the memory can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM, Read Only Memory), a programmable read-only memory (PROM, Programmable Read-Only Memory), an erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory), an electrically erasable programmable read-only memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), a ferromagnetic random access memory (FRAM, ferromagnetic random access memory), a flash memory (Flash Memory), a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM, Compact Disc Read-Only Memory); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a random access memory (RAM, Random Access Memory), which is used as an external cache.By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), sync link dynamic random access memory (SLDRAM), direct rambus random access memory (DRRAM). The memories described in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0160] Among them, the control method of the embodiments of the present application can be applied to or implemented by a processor. The processor can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the voice conversion method can be completed by the integrated logic circuit of the hardware in the processor or the instructions in software form. The above-mentioned processor can be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor can implement or execute the various methods, steps, and logic block diagrams disclosed in the present invention. The general-purpose processor can be a microprocessor or any conventional processor, etc. Combining the steps of the control method disclosed in the present invention can be directly embodied as being executed and completed by the hardware decoding processor, or by a combination of the hardware and software modules in the decoding processor. The software module can be located in a storage medium, and this storage medium is located in the memory. The processor reads the information in the memory and combines its hardware to complete the steps of the control method provided in the embodiments of the present application.

[0161] The embodiments of the present application may further provide a computer storage medium, which stores computer-executable instructions that are executed by a processor to implement any one of the control methods in the embodiments of the present application. Specifically, it may be a computer-readable storage medium, for example, a memory including a stored computer program, and the above computer program can be executed by the processor of the processing device to complete the steps described in the design method of the embodiments of the present application. The computer-readable storage medium may be a memory such as ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM.

[0162] In the description of the present application, the descriptions referring to terms such as "in one embodiment", "in some embodiments", "in other embodiments", "in still other embodiments", or "exemplary", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine the different embodiments or examples described in the present application and the features of different embodiments or examples.

[0163] The foregoing is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included within the protection scope of the present application.

Claims

1. A method for controlling an exhaust gas recirculation valve for a vehicle, characterized in that: The control method comprises: Get the ambient temperature after the vehicle is powered on; If the ambient temperature is not less than the calibrated temperature, controlling the exhaust gas recirculation valve to be in an enabling mode; If the ambient temperature is lower than the calibrated temperature, obtaining vehicle parameters after the vehicle is powered on, and determining whether the exhaust gas recirculation valve meets the enabling condition based on the vehicle parameters; Wherein, the calibration temperature is not less than the dew point temperature of the exhaust gas.

2. The exhaust gas recirculation valve control method according to claim 1, characterized in that: The obtaining of vehicle parameters after the vehicle is powered on includes: obtaining the coolant temperature after the vehicle engine is started for the first time; The determining, based on the vehicle parameters, whether the exhaust gas recirculation valve meets the enabling condition comprises: comparing the coolant temperature with a first preset temperature; The first preset temperature is: the minimum temperature of the coolant that is calibrated to heat the valve body temperature of the exhaust gas recirculation valve to a temperature not less than the dew point temperature of the exhaust gas.

3. The exhaust gas recirculation valve control method according to claim 2, characterized in that: If the coolant temperature is not less than the first preset temperature, it is determined that the exhaust gas recirculation valve meets the enabling condition, and the exhaust gas recirculation valve is controlled to be in an enabling mode.

4. The exhaust gas recirculation valve control method according to claim 2, characterized in that: If the coolant temperature is lower than the first preset temperature, it is determined that the exhaust gas recirculation valve does not meet the enabling condition, and the exhaust gas recirculation valve is controlled to delay enabling for a first preset time period; The first preset time duration is the minimum time duration required for the valve body temperature of the exhaust gas recirculation valve to be heated to a temperature exceeding the dew point temperature of the exhaust gas by the engine coolant introduced into the cooler of the exhaust gas recirculation valve.

5. The exhaust gas recirculation valve control method according to claim 4, characterized in that: Before controlling the exhaust gas recirculation valve to delay enabling for a first preset time period, the control method includes: Determine the operating status of the vehicle; If the vehicle is in a power-off state, controlling the exhaust gas recirculation valve to exit delayed enabling; If the vehicle is always in the power-on state, the exhaust gas recirculation valve is controlled to be in the enabling mode after the exhaust gas recirculation valve is delayed for a first preset time period.

6. The exhaust gas recirculation valve control method according to claim 4, characterized in that: The control method comprises: After controlling the exhaust gas recirculation valve to be delayed for a first preset time period, obtaining a real-time valve body temperature of the exhaust gas recirculation valve; The real-time valve body temperature is compared with the dew point temperature of the exhaust gas.

7. The exhaust gas recirculation valve control method according to claim 6, characterized in that: The step of obtaining the real-time valve body temperature of the exhaust gas recirculation valve comprises: Obtaining the real-time temperature of the coolant of the engine; Based on the real-time temperature of the coolant of the engine, the real-time valve body temperature of the exhaust gas recirculation valve is obtained.

8. The exhaust gas recirculation valve control method according to claim 6, characterized in that: The control method comprises: If the real-time valve body temperature is not less than the dew point temperature of the exhaust gas, the exhaust gas recirculation valve is controlled to maintain an enabling mode.

9. The exhaust gas recirculation valve control method according to claim 6, characterized in that: The control method comprises: If the real-time valve body temperature is less than the dew point temperature of the exhaust gas, controlling the exhaust gas recirculation valve to switch from an enabled mode to a disabled mode; Controlling the exhaust gas recirculation valve to be in the non-enabled mode for a second preset time period and then switching to the enabled mode; The second preset time duration is the minimum time duration during which the valve body temperature of the exhaust gas recirculation valve can continue to heat the engine coolant introduced into the cooler of the exhaust gas recirculation valve to a temperature exceeding the dew point temperature.

10. The exhaust gas recirculation valve control method according to claim 9, characterized in that: The second preset time length is shorter than the first preset time length.

11. The exhaust gas recirculation valve control method according to claim 10, characterized in that: The first preset time length is not less than three minutes; and / or the second preset time length is not less than two minutes.

12. The exhaust gas recirculation valve control method according to any one of claims 1 to 11, characterized in that: The dew point temperature is less than 40°C.

13. The exhaust gas recirculation valve control method according to any one of claims 2 to 9, characterized in that: The first preset temperature is not less than 60°C.

14. A control device for an exhaust gas recirculation valve, applying the control method according to any one of claims 1 to 13, characterized in that: The control device comprises: An acquisition module, the acquisition module is used to acquire at least the ambient temperature of the vehicle, the coolant temperature after the engine is started for the first time, and the real-time valve body temperature of the exhaust gas recirculation valve; a determination module, for determining whether the ambient temperature is greater than the calibration temperature, whether the coolant temperature after the engine is first started is greater than a first preset temperature; and determining whether the real-time valve body temperature of the exhaust gas recirculation valve is greater than the dew point temperature of the exhaust gas; The control module is configured to control the exhaust gas recirculation valve to be in an enabling mode or to delay enabling based on the comparison information of the determination module.

15. A vehicle, characterized in that: A control device for an exhaust gas recirculation valve as claimed in claim 14, wherein the vehicle comprises an engine and an exhaust gas recirculation valve, the exhaust gas recirculation valve comprises a valve body and a cooler which are connected to each other, a coolant flow path is provided between the cooler and the engine, and coolant of the engine flows to the cooler through the coolant flow path to heat the valve body through the cooler.

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