An engine exhaust temperature management method, device, electronic device and medium

Abstract

The present invention relates to an engine exhaust temperature management method, device, electronic device and medium. The method includes: obtaining the engine speed and water temperature, setting a first preset water temperature for cold start of the engine and a second preset water temperature for hot start of the engine, and setting the lowest exhaust temperature of the engine; obtaining the curve of the engine exhaust temperature changing with time to obtain the first predicted exhaust temperature and the second predicted exhaust temperature of the engine; when the water temperature of the engine is not greater than the first preset water temperature, or when the water temperature of the engine is not less than the second preset water temperature and the water temperature of the engine is less than the lowest exhaust temperature, taking measures to increase the engine exhaust temperature; when the engine speed is not less than the preset speed, determining that the engine is in the operating stage; when the exhaust temperature at the current moment of the engine is greater than the lowest exhaust temperature, determining to take heat management measures based on the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature and the second predicted exhaust temperature, so that the engine exhaust temperature meets the operating requirements. The present invention maximally exerts the economy of the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to an engine exhaust temperature management method, device, electronic device and medium. Background Art

[0002] The main emissions of diesel engines are NOx and PM. With the continuous improvement of regulations, the emission requirements are more stringent. For diesel engines, in addition to optimizing the original engine emissions, the exhaust temperature also needs to be considered to improve the efficiency of aftertreatment. The final emissions of the engine are improved from two aspects: the original engine and the tailpipe to meet the regulatory requirements.

[0003] The engine exhaust temperature refers to the temperature of the engine exhaust manifold. The engine exhaust temperature is one of the important parameters characterizing the combustion state of the engine and is an important factor affecting the reliability and consistency of the engine.

[0004] In the prior art, there is a lack of a method for predicting the engine exhaust temperature, thereby improving the final emissions of the engine and maximizing the economic potential of the engine. Summary of the Invention

[0005] In view of this, it is necessary to provide an engine exhaust temperature management method, device, electronic device and medium to achieve the purpose of maximizing the economic potential of the engine.

[0006] To achieve the above object, the present invention provides an engine exhaust temperature management method, including:

[0007] Obtain the engine speed and water temperature, set a first preset water temperature for cold starting of the engine, set a second preset water temperature for hot starting of the engine, and set the minimum exhaust temperature of the engine;

[0008] Obtain the temperature-time curve of the engine exhaust temperature changing with time, predict the first predicted exhaust temperature of the engine at the next moment of the current moment based on the temperature-time curve, and predict the second predicted exhaust temperature of the engine at several subsequent moments of the current moment based on the temperature-time curve;

[0009] When the water temperature of the engine is not greater than the first preset water temperature, or when the water temperature of the engine is not less than the second preset water temperature and the water temperature of the engine is less than the minimum exhaust temperature, control to close the throttle valve opening, control to increase the exhaust of the electronically controlled wastegate turbocharger, control to increase the opening of the exhaust gas recirculation control valve, or control to deteriorate the fuel injection parameters to increase the engine exhaust temperature;

[0010] When the engine speed is not less than the preset speed, it is determined that the engine is in the running stage;

[0011] During the operation stage of the engine, when the exhaust temperature at the current moment of the engine is lower than the minimum exhaust temperature, control the throttle valve opening to be reduced, control the increase of the wastegate of the electronically controlled wastegate turbocharger, control the increase of the opening of the exhaust gas recirculation control valve, and deteriorate the fuel injection parameters to increase the exhaust temperature of the engine;

[0012] During the operation stage of the engine, when the exhaust temperature at the current moment of the engine is higher than the minimum exhaust temperature, determine to take thermal management measures based on the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature to reduce the exhaust temperature of the engine.

[0013] In some possible implementation manners, the predicting the first predicted exhaust temperature of the engine at the next moment of the current moment based on the temperature-time curve includes:

[0014] Determine the current moment on the temperature-time curve and the slope of the first temperature-time curve before the previous moment ;

[0015] Determine the average value of the slopes, or the minimum value of the slopes, as the first predicted exhaust temperature.

[0016] In some possible implementation manners, the predicting the second predicted exhaust temperature of the engine at several subsequent moments of the current moment based on the temperature-time curve includes:

[0017] Obtain the first exhaust temperature of the engine corresponding to the current moment on the temperature-time curve;

[0018] Obtain the second exhaust temperature of the engine corresponding to the previous moment of the current moment on the temperature-time curve;

[0019] Obtain the third exhaust temperature of the engine corresponding to two moments before the current moment on the temperature-time curve;

[0020] Determine the second predicted exhaust temperature according to the first exhaust temperature, the second exhaust temperature, and the third exhaust temperature.

[0021] In some possible implementation manners, the calculation formula for the second predicted exhaust temperature is:

[0022]

[0023] In the formula, represents the second predicted exhaust temperature; represents the current moment; represents the current moment the exhaust temperature of the engine; represents the current moment two moments before; Indicates the current moment The previous moment; Indicates the current moment The previous moment The exhaust gas temperature of the engine.

[0024] In some possible implementation manners, determining to take heat management measures based on the exhaust gas temperature at the current moment of the engine, the first predicted exhaust gas temperature, and the second predicted exhaust gas temperature, so that the exhaust gas temperature of the engine meets the operation requirements, includes:

[0025] When the exhaust gas temperature at the current moment of the engine is not greater than the first preset water temperature, by controlling to increase the gas discharge amount of the electronically controlled wastegate turbocharger, controlling to close the throttle valve opening, controlling to increase the valve opening of the exhaust system, and controlling to deteriorate the fuel injection parameters, increase the exhaust gas temperature of the engine;

[0026] When the exhaust gas temperature at the current moment of the engine is greater than the third preset temperature level, the first predicted exhaust gas temperature is greater than the third preset temperature level, and the first predicted exhaust gas temperature is greater than the fourth preset temperature level, control to increase the gas discharge of the electronically controlled wastegate turbocharger, control to close the throttle valve opening, and control to increase the opening of the exhaust system valve to increase the exhaust gas temperature of the engine;

[0027] When the exhaust gas temperature at the current moment of the engine is greater than the first preset temperature level, the first predicted exhaust gas temperature is greater than the first preset temperature level, and the second predicted exhaust gas temperature is greater than the second preset temperature level, control to increase the gas discharge of the electronically controlled wastegate turbocharger and control to close the throttle valve opening to increase the exhaust gas temperature of the engine;

[0028] When the exhaust gas temperature at the current moment of the engine is greater than the upper limit of the preset temperature level, the first predicted exhaust gas temperature is greater than the upper limit of the preset temperature level, and the second predicted exhaust gas temperature is greater than the first preset temperature level, control to increase the gas discharge of the electronically controlled wastegate turbocharger to increase the exhaust gas temperature of the engine;

[0029] When the exhaust gas temperature at the current moment of the engine is greater than the second preset temperature level, the first predicted exhaust gas temperature is greater than the second preset temperature level, and the second predicted exhaust gas temperature is greater than the third preset temperature level, control to increase the gas discharge of the electronically controlled wastegate turbocharger, control to close the throttle valve opening, and control to increase the opening of the exhaust system valve to increase the exhaust gas temperature of the engine.

[0030] In some possible implementation manners, it further includes:

[0031] Obtain the torque percentage, determine the load of the engine according to the torque percentage, and determine that the electronically controlled wastegate turbocharger does not perform gas discharge treatment according to the load of the engine to ensure the responsiveness or power performance of the engine.

[0032] In some possible implementations, when the load of the engine is not greater than a first preset load, it is determined that the electronically controlled wastegate turbocharger does not perform wastegate treatment to ensure the responsiveness of the engine;

[0033] When the load of the engine is greater than a second preset load, it is determined that the electronically controlled wastegate supercharger does not perform wastegate treatment to ensure the power performance of the engine.

[0034] On the other hand, the present invention also provides an engine exhaust temperature management device, including:

[0035] An engine data acquisition module, configured to acquire the engine speed and water temperature, set a first preset water temperature for cold start of the engine, set a second preset water temperature for hot start of the engine, and set the minimum exhaust temperature of the engine;

[0036] A predicted exhaust temperature acquisition module, configured to acquire a temperature-time curve of the engine exhaust temperature changing with time, predict a first predicted exhaust temperature of the engine at the next moment of the current moment based on the temperature-time curve, and predict a second predicted exhaust temperature of the engine at several subsequent moments of the current moment based on the temperature-time curve;

[0037] A first module, configured to, when the water temperature of the engine is not greater than the first preset water temperature, or when the water temperature of the engine is not less than the second preset water temperature and the water temperature of the engine is less than the minimum exhaust temperature, control to close the throttle valve opening, control to increase the wastegate of the electronically controlled wastegate turbocharger, control to increase the opening of the exhaust gas recirculation control valve, or control to deteriorate the fuel injection parameters to increase the engine exhaust temperature;

[0038] An operating stage determination module, configured to determine that the engine is in an operating stage when the engine speed is not less than a preset speed;

[0039] A second module, configured to, during the operating stage of the engine, when the exhaust temperature at the current moment of the engine is less than the minimum exhaust temperature, control to close the throttle valve opening, control to increase the wastegate of the electronically controlled wastegate turbocharger, control to increase the opening of the exhaust gas recirculation control valve, or control to deteriorate the fuel injection parameters to increase the engine exhaust temperature;

[0040] A third module, configured to, during the operating stage of the engine, when the exhaust temperature at the current moment of the engine is greater than the minimum exhaust temperature, determine to take heat management measures based on the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature to reduce the engine exhaust temperature.

[0041] On the other hand, the present invention also provides an electronic device, including a memory and a processor, wherein,

[0042] The memory is used for storing programs;

[0043] The processor, coupled to the memory, is configured to execute the program stored in the memory to implement the steps in the engine exhaust temperature management method described in any one of the above implementation manners.

[0044] On the other hand, the present invention further provides a computer-readable storage medium for storing computer-readable programs or instructions, and when the programs or instructions are executed by a processor, the steps in the engine exhaust temperature management method described in any one of the above implementation manners can be implemented.

[0045] The beneficial effects of adopting the above embodiments are as follows: For an engine exhaust temperature management method provided by the present invention, the engine speed and water temperature are obtained, and a temperature-time curve of the engine exhaust temperature changing with time is obtained to get a first predicted exhaust temperature and a second predicted exhaust temperature. When the water temperature of the engine is not greater than the first preset water temperature, or when the water temperature of the engine is not less than the second preset water temperature and the water temperature of the engine is less than the lowest exhaust temperature, the throttle opening is controlled to be reduced, the wastegate of the turbocharger is opened, the opening of the exhaust gas recirculation system valve is increased, or the fuel injection parameters are deteriorated to increase the engine exhaust temperature. During the operation stage of the engine, when the exhaust temperature at the current moment of the engine is less than the lowest exhaust temperature, the strictest thermal management method is adopted to increase the engine exhaust temperature. When the exhaust temperature at the current moment of the engine is greater than the lowest exhaust temperature, thermal management measures are determined based on the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature to reduce the engine exhaust temperature. The present invention obtains the first predicted exhaust temperature and the second predicted exhaust temperature of the engine exhaust temperature at the current moment through the temperature-time curve, and determines thermal management measures based on the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature to reduce the engine exhaust temperature, thereby maximizing the economic potential of the engine. Description of the Drawings

[0046] Figure 1 It is a flowchart of a method according to an embodiment of an engine exhaust temperature management method provided by the present invention;

[0047] Figure 2 It is a schematic structural diagram of an embodiment of an engine exhaust temperature management device provided by the present invention;

[0048] Figure 3 It is a schematic structural diagram of an embodiment of an electronic device provided by the present invention. Detailed Embodiments

[0049] The following will specifically describe the preferred embodiments of the present invention with reference to the drawings. The drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0050] Figure 1The following is a schematic flowchart of an embodiment of an engine exhaust temperature management method provided by the present invention. As Figure 1 shown, an engine exhaust temperature management method includes:

[0051] S101. Obtain the engine speed and water temperature, set a first preset water temperature for engine cold start, set a second preset water temperature for engine hot start, and set the minimum exhaust temperature of the engine;

[0052] S102. Obtain the temperature-time curve of the engine exhaust temperature changing with time, predict the first predicted exhaust temperature of the engine at the next moment of the current moment based on the temperature-time curve, and predict the second predicted exhaust temperature of the engine at several subsequent moments of the current moment based on the temperature-time curve;

[0053] S103. When the water temperature of the engine is not greater than the first preset water temperature, or when the water temperature of the engine is not less than the second preset water temperature and the water temperature of the engine is less than the minimum exhaust temperature, control to close the throttle valve opening, control to increase the exhaust of the electronically controlled wastegate turbocharger, control to increase the opening of the exhaust gas recirculation control valve, or control to deteriorate the fuel injection parameters, so as to increase the engine exhaust temperature;

[0054] S104. When the engine speed is not less than the preset speed, determine that the engine is in the running stage;

[0055] S105. During the running stage of the engine, when the exhaust temperature at the current moment of the engine is less than the minimum exhaust temperature, control to close the throttle valve opening, control to increase the exhaust of the electronically controlled wastegate turbocharger, control to increase the opening of the exhaust gas recirculation control valve, or control to deteriorate the fuel injection parameters, so as to increase the engine exhaust temperature;

[0056] S106. During the running stage of the engine, when the exhaust temperature at the current moment of the engine is greater than the minimum exhaust temperature, determine to take thermal management measures based on the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature, so as to reduce the engine exhaust temperature.

[0057] Compared with the prior art, an engine exhaust temperature management method provided in this embodiment obtains the engine speed and water temperature, obtains the temperature-time curve of the engine exhaust temperature changing with time to obtain the first predicted exhaust temperature and the second predicted exhaust temperature. When the water temperature of the engine is not greater than the first preset water temperature, or when the water temperature of the engine is not less than the second preset water temperature and the water temperature of the engine is less than the lowest exhaust temperature, the throttle opening is controlled to be closed, the electronically controlled wastegate turbocharger is deflated, the opening of the exhaust gas recirculation system valve is increased, or the fuel injection parameters are deteriorated to increase the engine exhaust temperature. During the operation stage of the engine, when the exhaust temperature at the current moment of the engine is less than the lowest exhaust temperature, the strictest thermal management method is adopted to increase the engine exhaust temperature. When the exhaust temperature at the current moment of the engine is greater than the lowest exhaust temperature, thermal management measures are determined based on the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature to reduce the engine exhaust temperature. The present invention obtains the first predicted exhaust temperature and the second predicted exhaust temperature of the engine exhaust temperature at the current moment through the temperature-time curve, and determines thermal management measures through the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature to reduce the engine exhaust temperature, thereby maximizing the potential of the engine economy.

[0058] It should be noted that for E-WGT (electricity Waste Gate Turbocharger), the high-temperature exhaust gas of 700 - 900 degrees Celsius discharged from the engine is used to drive the turbine in the turbine to rotate. The turbine shaft drives the impeller in the compressor to rotate at high speed, compressing air in a centrifugal manner to increase the intake air density of the engine to 2 - 3 atmospheres. Thus, more fuel can be injected into the engine to achieve the purpose of increasing the engine power per liter.

[0059] It should be noted that for EGR (Exhaust Gas Recycling), the setting of the EGR system is to reduce the emission of NOx in vehicle exhaust and ultimately reduce the pollution to the atmosphere.

[0060] There are two conditions for the generation of NOx: high temperature and excessive oxygen. Since the exhaust gas contains a large amount of CO2, and CO2 cannot burn but can absorb a large amount of heat, introducing the exhaust gas to participate in combustion can reduce the combustion temperature of the air-fuel mixture in the cylinder, improve the situation of high temperature and rich oxygen, and thus effectively inhibit the emission of NOx.

[0061] Due to the characteristics of NOx generation, it is determined that the EGR (Exhaust Gas Recycling system) does not operate continuously. Only at high speeds and medium loads, when the conditions for NOx generation are met, the EGR (Exhaust Gas Recycling system) will be put into operation to control the pollution value of NOx emissions. Moreover, the amount of exhaust gas participating in the recirculation varies according to the engine speed, load, temperature, and exhaust gas temperature to minimize NOx in the exhaust gas. When the engine is idling, running at low speed, under light load, or cold, excessive exhaust gas participating in the recirculation will affect the ignition and performance of the air-fuel mixture, thereby affecting the power performance of the engine. That is to say, when the engine is idling, running at low speed, under light load, or cold, the EGR (Exhaust Gas Recycling system) will not operate. If the EGR (Exhaust Gas Recycling system) is damaged, it may cause problems such as increased fuel consumption, unstable engine idling, insufficient power, and incomplete combustion.

[0062] It should be noted that TVA refers to the throttle valve (Throttle Valve Actuator). It is different from the throttle valve of a gasoline engine (which actually increases the engine's compliance or fuel injection volume). The throttle valve on a diesel engine mainly adjusts the engine's intake air volume by changing the flow area of the intake pipe, and its main function is exhaust heat management. It should be noted that automotive torque refers to the torque force of the vehicle and is also the torque output from the crankshaft end of the engine. Under the condition of a fixed engine power, torque is inversely proportional to the engine speed. The faster the speed, the smaller the engine torque; the slower the speed, the greater the engine torque. At the same time, it also reflects the vehicle's load capacity within a certain range. The torque and power of the engine are important parameters of the engine. Through the engine power, the vehicle's performance can be reflected, including acceleration, climbing ability, and suspension. The higher the torque, the better the vehicle's running response. The greater the torque, the greater the vehicle's load-bearing capacity, the better the acceleration performance, and the fewer the number of engine gearshifts, which can reduce engine wear. For a family car, the greater the torque, the better the acceleration performance; for an off-road vehicle, the greater the torque, the greater the climbing slope; for a truck, the greater the torque, the heavier the load it can carry. For vehicles with the same displacement, the greater the torque, the better the engine.

[0063] In some embodiments of the present invention, predicting the first predicted exhaust temperature of the engine at the next moment based on the temperature-time curve includes:

[0064] Determining the current moment on the temperature-time curve and the slope of the first temperature-time curve before the previous moment ​

[0065] Determine the average value of the slopes, or the minimum value among the slopes, as the first predicted exhaust temperature.

[0066] In some embodiments of the present invention, predicting the second predicted exhaust temperature of the engine at several subsequent moments based on the temperature-time curve includes:

[0067] Obtain the first exhaust temperature of the engine corresponding to the current moment on the temperature-time curve;

[0068] Obtain the second exhaust temperature of the engine corresponding to the previous moment of the current moment on the temperature-time curve;

[0069] Obtain the third exhaust temperature of the engine corresponding to two moments before the current moment on the temperature-time curve;

[0070] Determine the second predicted exhaust temperature according to the first exhaust temperature, the second exhaust temperature, and the third exhaust temperature.

[0071] In some embodiments of the present invention, the calculation formula for the second predicted exhaust temperature is:

[0072]

[0073] In the formula, represents the second predicted exhaust temperature; represents the current moment; represents the current moment the exhaust temperature of the engine; represents the current moment two moments before; represents the current moment the previous moment of; represents the current moment the previous moment of the exhaust temperature of the engine.

[0074] In specific embodiments of the present invention, in an actual application scenario, the ECU determines whether the engine is in a shutdown, startup, or running state by the engine speed, confirms the operating load of the engine and the driver's driving intention, such as smooth driving, coasting, rapid acceleration, etc., through an internal torque model and the throttle opening, and predicts which exhaust temperature management method the engine adopts to ensure the best economy on the premise of meeting the aftertreatment exhaust temperature requirements by the temperature value at the EGP inlet and in combination with the exhaust temperature prediction model. There are the following scenarios in actual operation:

[0075] Engine starting: There are two cases in total. One is cold engine starting, which can be judged by the engine speed and water temperature read by the ECU. If the engine water temperature ≤ T—water low (the first preset water temperature), it is judged as cold starting. At this time, it is necessary to enter the rapid warm-up mode, that is, the least economical mode. Usually, by appropriately closing the throttle opening, appropriately bleeding the E-WGT, appropriately increasing the EGR and cooperating with the way of deteriorating fuel injection to increase the exhaust temperature (reducing the rail pressure, timing), etc., to quickly meet the exhaust temperature requirements as much as possible, so as to ensure that the aftertreatment system can work efficiently and ensure that the engine emissions meet the regulatory requirements. The other is hot engine starting, which can be judged by the engine speed and water temperature read by the ECU. If the engine water temperature ≥ T—water warm (the second preset water temperature), it is judged as hot engine starting, and combined with the inlet temperature level of the EGP, it is judged that if the EGP inlet temperature is lower than the lowest exhaust temperature T-cool, it will be processed according to the cold engine mode, otherwise it will be processed with reference to the operating mode.

[0076] Engine operation: In this stage, the operating state is judged by the engine speed read by the ECU. In addition, according to the temperature at the inlet of the EGP and combined with the prediction model, the temperature is increased or kept warm in a certain priority. In principle, it is to predict the temperature change trend in advance and give corresponding execution means according to the priority of the influence of each actuator on economy. Usually, from the perspective of economy, the most economical mode is that appropriately bleeding the E-WGT will not only increase the exhaust temperature, but even improve the economy (it can reduce the pumping loss), but the improvement space of this method is small; closing the TVA (throttle) can effectively reduce the intake air volume of fresh air, reduce the air-fuel ratio, and has a good effect on temperature increase. In addition, it can further increase the exhaust temperature when combined with the use of EGR. However, the amount of EGR must be appropriate. If the EGR is too large, it will not only deteriorate the economy but also increase the particulate emissions, which is not friendly to the aftertreatment DPF; for the operating conditions of long-term extremely low load, the above means may not be able to ensure the target exhaust temperature. At this time, it is necessary to use the fuel injection system to further increase the exhaust temperature by deteriorating combustion. Usually, it can be achieved by reducing the rail pressure, reducing the main injection timing, and increasing the post-injection. This is also the most conventional method at present, and the comprehensive economy is poor.

[0077] In some embodiments of the present invention, determining to take heat management measures based on the current exhaust temperature of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature so that the engine exhaust temperature meets the operating requirements includes:

[0078] When the exhaust temperature of the engine at the current moment is not greater than the first preset water temperature, the exhaust temperature of the engine is increased by controlling to increase the air release amount of the electronically controlled wastegate turbocharger, controlling to close the throttle valve opening, controlling to increase the valve opening of the exhaust system, and controlling to deteriorate the fuel injection parameters;

[0079] When the exhaust temperature of the engine at the current moment is greater than the third preset temperature level and the first predicted exhaust temperature is greater than the third preset temperature level, and the first predicted exhaust temperature is greater than the fourth preset temperature level, control to increase the air release of the electronically controlled wastegate turbocharger, control to close the throttle valve opening, and control to increase the valve opening of the exhaust system valve to increase the exhaust temperature of the engine;

[0080] When the exhaust temperature of the engine at the current moment is greater than the first preset temperature level and the first predicted exhaust temperature is greater than the first preset temperature level, and the second predicted exhaust temperature is greater than the second preset temperature level, control to increase the air release of the electronically controlled wastegate turbocharger and control to close the throttle valve opening to increase the exhaust temperature of the engine;

[0081] When the exhaust temperature of the engine at the current moment is greater than the upper limit of the preset temperature level and the first predicted exhaust temperature is greater than the upper limit of the preset temperature level, and the second predicted exhaust temperature is greater than the first preset temperature level, control to increase the air release of the electronically controlled wastegate turbocharger to increase the exhaust temperature of the engine;

[0082] When the exhaust temperature of the engine at the current moment is greater than the second preset temperature level and the first predicted exhaust temperature is greater than the second preset temperature level, and the second predicted exhaust temperature is greater than the third preset temperature level, control to increase the air release of the electronically controlled wastegate turbocharger, control to close the throttle valve opening, and control to increase the valve opening of the exhaust system valve to increase the exhaust temperature of the engine.

[0083] In a specific embodiment of the present invention, the first preset temperature level is represented by T-hot1, the second preset temperature level is represented by T-hot2, the third preset temperature level is represented by T-hot3, the fourth preset temperature level is represented by T-hot4, and T-hot1 < T-hot2 < T-hot3 < T-hot4 < T-hot. T-hot represents the upper boundary of exhaust temperature management. If the exhaust temperature of the engine at the current time is greater than T-hot, the exhaust temperature management exits.

[0084] It should be noted that in a specific embodiment of the present invention, T-t0 represents the exhaust temperature of the engine at the current moment, T-t1’ represents the predicted exhaust temperature of the engine at the next moment of the current moment, T-t2’ represents the predicted exhaust temperature of the engine at the next two moments of the current moment, and Tcool is the lowest exhaust temperature.

[0085] In a specific embodiment of the present invention, when T-t0 (the exhaust temperature of the engine at the current moment) < T-cool, the most stringent exhaust temperature management measures are executed until T-t0 ≥ T-hot;

[0086] When T-t0 (the current exhaust temperature) > T-hot and T-t1’ > Tcool, enter the mode of judging the mode with T-t2’, where economy is the priority, and its priority is as follows:

[0087] When the average value of T-t0 and T-t1’ is greater than and T-t2’ is greater than T-hot and, no thermal management measures are taken;

[0088] When the average value of T-t0 and T-t1’ > T-hot, while T-t2’ > T-hot1, execute EWGT, that is, by increasing the air release amount of the electronically controlled wastegate turbocharger, to increase the exhaust temperature by reducing the intake air amount of the engine;

[0089] When the average value of T-t0 and T-t1’ > T-hot1, while T-t2’ > T-hot2, execute EWGT+TVA, that is, only relying on EWGT cannot meet the exhaust temperature requirement, and the throttle valve needs to close its opening (reduce the intake air flow area of the intake manifold) to further reduce the intake air amount to reach the target exhaust temperature of the engine;

[0090] When the average value of T-t0 and T-t1’ > T-hot2, while T-t2’ > T-hot1, execute EWGT+TVA+EGR, that is, relying on EWGT and TVA still cannot meet the exhaust temperature requirement, and at this time, the exhaust temperature can be further increased by appropriately increasing the EGR rate, that is, increasing the opening of the EGR valve;

[0091] When the average value of T-t0 and T-t1’ > T-hot3, while T-t1’ > T-hot4, execute EWGT+TVA+EGR, the purpose is to wait briefly to see if there is an opportunity;

[0092] When T-t0 ≤ Tcool, execute EWGT+TVA+EGR+the most stringent exhaust temperature management of the combustion system, that is, by increasing the air release amount of the electronically controlled wastegate turbocharger, closing the opening of the throttle valve, adding the opening of the EGR valve, and deteriorating the fuel injection to increase the exhaust temperature of the engine until T-t0 ≥ T-hot;

[0093] When T-t0 (the current exhaust temperature) > T-hot4 and Tcool < T-t1 < T-hot4, execute EWGT+TVA+EGR, the purpose is to wait briefly to see if there is an opportunity;

[0094] T - t0 (current exhaust temperature) > T - hot4, and T - t1 < Tcool, indicating that the previous prediction did not meet expectations. Exit the prediction mode and perform conventional exhaust temperature management based on T - t0 as the judgment condition.

[0095] In some embodiments of the present invention, it further includes:

[0096] Obtain the torque percentage, determine the load of the engine according to the torque percentage, and determine that the electronically controlled wastegate turbocharger does not perform wastegate treatment according to the load of the engine to ensure the responsiveness or power performance of the engine.

[0097] In some embodiments of the present invention, when the load of the engine is not greater than the first preset load, it is determined that the electronically controlled wastegate turbocharger does not perform wastegate treatment to ensure the responsiveness of the engine;

[0098] When the load of the engine is greater than the second preset load, it is determined that the electronically controlled wastegate turbocharger does not perform wastegate treatment to ensure the power performance of the engine.

[0099] In a specific embodiment of the present invention, through internal torque percentage judgment, when the engine runs at a low load, such as ≤ a%, regardless of the mode, the electronically controlled wastegate turbocharger does not open the wastegate valve and does not perform wastegate treatment to ensure the responsiveness of the engine;

[0100] Through internal torque percentage judgment, when the engine runs at a high load, such as > b%, regardless of the mode, the electronically controlled wastegate turbocharger does not open the wastegate valve and does not perform wastegate treatment to ensure the power performance of the engine.

[0101] To better implement an engine exhaust temperature management method in the embodiments of the present invention, correspondingly, on the basis of an engine exhaust temperature management method, as Figure 2 shown, the embodiments of the present invention further provide an engine exhaust temperature management device. An engine exhaust temperature management device 200 includes:

[0102] An engine data acquisition module 201, configured to acquire the engine speed and water temperature, set a first preset water temperature for engine cold start, set a second preset water temperature for engine hot start, and set the lowest exhaust temperature of the engine;

[0103] A predicted exhaust temperature acquisition module 202, configured to acquire a temperature - time curve of the engine exhaust temperature changing with time, predict a first predicted exhaust temperature of the engine at the next moment of the current moment based on the temperature - time curve, and predict a second predicted exhaust temperature of the engine at several subsequent moments of the current moment based on the temperature - time curve;

[0104] The first module 203 is configured to, when the water temperature of the engine is not greater than the first preset water temperature, or when the water temperature of the engine is not less than the second preset water temperature and the water temperature of the engine is less than the lowest exhaust temperature, control the throttle opening to be reduced, control the increase of the wastegate of the electronically controlled wastegate turbocharger, control the increase of the opening of the exhaust gas recirculation control valve, or control the deterioration of the fuel injection parameters, so as to increase the engine exhaust temperature;

[0105] The operation stage determination module is configured to determine that the engine is in the operation stage when the engine speed is not less than the preset speed;

[0106] The second module 204 is configured to, during the operation stage of the engine, when the exhaust temperature of the engine at the current moment is less than the lowest exhaust temperature, control the throttle opening to be reduced, control the increase of the wastegate of the electronically controlled wastegate turbocharger, control the increase of the opening of the exhaust gas recirculation control valve, or control the deterioration of the fuel injection parameters, so as to increase the engine exhaust temperature;

[0107] The third module 205 is configured to, during the operation stage of the engine, when the exhaust temperature of the engine at the current moment is greater than the lowest exhaust temperature, determine to take thermal management measures based on the exhaust temperature of the engine at the current moment, the first predicted exhaust temperature, and the second predicted exhaust temperature, so that the engine exhaust temperature meets the operation requirements.

[0108] This embodiment is invented for an E-WGT engine. By predicting the engine exhaust temperature at a future moment based on the engine historical data and then coordinating the priorities of various strategies with economy as the core, the maximum potential of the engine economy is exerted to meet the customer's demand for economy.

[0109] This embodiment also formulates corresponding strategies according to the vehicle application scenarios to ensure the responsiveness and power performance of the engine. In short, this method is a method of intelligently managing the exhaust temperature by predicting the exhaust temperature of the engine and coordinating the priorities of each actuator on the premise of ensuring the responsiveness and power performance of the whole vehicle, so as to exert the maximum potential of the engine and enhance the competitiveness of the product, and has a broad application prospect.

[0110] The engine exhaust temperature management device 200 provided in the above embodiment can implement the technical solutions described in the above embodiment of an engine exhaust temperature management method. The specific implementation principles of the above modules or units can refer to the corresponding content in the above embodiment of an engine exhaust temperature management method, which will not be elaborated here.

[0111] As Figure 3 shown, the present invention also correspondingly provides an electronic device 300. The electronic device 300 includes a processor 301, a memory 302, and a display 303. Figure 3Only some components of the electronic device 300 are shown, but it should be understood that it is not required to implement all the shown components, and more or fewer components can be alternatively implemented.

[0112] In some embodiments, the processor 301 may be a central processing unit (CPU), a microprocessor, or other data processing chips, and is used to run the program code stored in the memory 302 or process data, such as an engine exhaust temperature management method in the present invention.

[0113] In some embodiments, the processor 301 may be a single server or a server group. The server group may be centralized or distributed. In some embodiments, the processor 301 may be local or remote. In some embodiments, the processor 301 may be implemented on a cloud platform. In one embodiment, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, a multi-cloud, etc., or any combination of the above.

[0114] In some embodiments, the memory 302 may be an internal storage unit of the electronic device 300, such as the hard disk or memory of the electronic device 300. In some other embodiments, the memory 302 may also be an external storage device of the electronic device 300, such as a plug-in hard disk equipped on the electronic device 300, a smart media card (SMC), a secure digital (SD) card, a flash card, etc.

[0115] Furthermore, the memory 303 may also include both the internal storage unit of the electronic device 300 and the external storage device. The memory 302 is used to store the application software installed in the electronic device 300 and various types of data.

[0116] In some embodiments, the display 303 may be an LED display, a liquid crystal display, a touch liquid crystal display, and an OLED (organic light-emitting diode) toucher, etc. The display 303 is used to display the information in the electronic device 300 and to display a visual user interface. The components 301-303 of the electronic device 300 communicate with each other through a system bus.

[0117] In one embodiment, when the processor 301 executes an engine exhaust temperature management program in the memory 302, the following steps may be implemented:

[0118] Obtain the engine speed and water temperature, set a first preset water temperature for cold start of the engine, set a second preset water temperature for hot start of the engine, and set the minimum exhaust temperature of the engine;

[0119] Obtain the temperature-time curve of the engine exhaust temperature varying with time, predict the first predicted exhaust temperature of the engine at the next moment of the current moment based on the temperature-time curve, and predict the second predicted exhaust temperature of the engine at several moments after the current moment based on the temperature-time curve;

[0120] When the water temperature of the engine is not greater than the first preset water temperature, or when the water temperature of the engine is not less than the second preset water temperature and the water temperature of the engine is less than the lowest exhaust temperature, control to close the throttle valve opening, control to increase the turbocharger bleed of the electronic control bleed valve, control to increase the opening of the exhaust gas recirculation control valve, or control to deteriorate the fuel injection parameters to increase the engine exhaust temperature;

[0121] When the engine speed is not less than the preset speed, determine that the engine is in the operating stage;

[0122] During the operating stage of the engine, when the exhaust temperature at the current moment of the engine is less than the lowest exhaust temperature, control to close the throttle valve opening, control to increase the turbocharger bleed of the electronic control bleed valve, control to increase the opening of the exhaust gas recirculation control valve, or control to deteriorate the fuel injection parameters to increase the engine exhaust temperature;

[0123] During the operating stage of the engine, when the exhaust temperature at the current moment of the engine is greater than the lowest exhaust temperature, determine to take thermal management measures based on the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature, so that the engine exhaust temperature meets the operating requirements.

[0124] It should be understood that when the processor 301 executes an engine exhaust temperature management program in the memory 302, in addition to the above functions, other functions can also be realized. For specific details, reference can be made to the description of the corresponding method embodiments above.

[0125] Furthermore, the type of the electronic device 300 mentioned in the embodiments of the present invention is not specifically limited. The electronic device 300 can be a portable electronic device such as a mobile phone, a tablet computer, a personal digital assistant (PDA), a wearable device, a laptop computer, etc. Exemplary embodiments of the portable electronic device include, but are not limited to, portable electronic devices running IOS, android, microsoft, or other operating systems. The above portable electronic devices can also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (such as a touch panel). It should also be understood that in some other embodiments of the present invention, the electronic device 300 can also not be a portable electronic device, but a desktop computer with a touch-sensitive surface (such as a touch panel).

[0126] Those skilled in the art can understand that all or part of the processes of implementing the methods of the above embodiments can be completed by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. Among them, the computer-readable storage medium is a disk, an optical disc, a read-only memory, or a random access memory, etc.

[0127] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An engine exhaust temperature management method, characterized in that, Including: Obtain the engine speed and water temperature, set a first preset water temperature for cold start of the engine, set a second preset water temperature for hot start of the engine, and set the minimum exhaust temperature of the engine; Obtain the temperature-time curve of the engine exhaust temperature changing with time, predict the first predicted exhaust temperature of the engine at the next moment of the current moment based on the temperature-time curve, and predict the second predicted exhaust temperature of the engine at several subsequent moments of the current moment based on the temperature-time curve; When the water temperature of the engine is not greater than the first preset water temperature, or when the water temperature of the engine is not less than the second preset water temperature and the water temperature of the engine is less than the minimum exhaust temperature, control to close the throttle valve opening, control to increase the exhaust of the electronically controlled wastegate turbocharger, control to increase the opening of the exhaust gas recirculation control valve, or control to deteriorate the fuel injection parameters to increase the engine exhaust temperature; When the engine speed is not less than the preset speed, determine that the engine is in the operating stage; During the operating stage of the engine, when the exhaust temperature at the current moment of the engine is less than the minimum exhaust temperature, control to close the throttle valve opening, control to increase the exhaust of the electronically controlled wastegate turbocharger, control to increase the opening of the exhaust gas recirculation control valve, or control to deteriorate the fuel injection parameters to increase the engine exhaust temperature; During the operating stage of the engine, when the exhaust temperature at the current moment of the engine is greater than the minimum exhaust temperature, determine to take thermal management measures based on the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature so that the engine exhaust temperature meets the operating requirements; The determining to take thermal management measures based on the exhaust temperature at the current moment of the engine, the first predicted exhaust temperature, and the second predicted exhaust temperature so that the engine exhaust temperature meets the operating requirements includes: When the exhaust temperature at the current moment of the engine is not greater than the first preset water temperature, increase the exhaust temperature of the engine by controlling to increase the exhaust volume of the electronically controlled wastegate turbocharger, controlling to close the throttle valve opening, controlling to increase the opening of the exhaust system valve, and controlling to deteriorate the fuel injection parameters; When the average value of the exhaust temperature at the current moment of the engine and the first predicted exhaust temperature is greater than the third preset temperature level, and the first predicted exhaust temperature is greater than the fourth preset temperature level, control to increase the exhaust of the electronically controlled wastegate turbocharger, control to close the throttle valve opening, and control to increase the opening of the exhaust system valve to increase the exhaust temperature of the engine; When the average value of the exhaust temperature at the current moment of the engine and the first predicted exhaust temperature is greater than the first preset temperature level, and the second predicted exhaust temperature is greater than the second preset temperature level, control to increase the exhaust of the electronically controlled wastegate turbocharger and control to close the throttle valve opening to increase the exhaust temperature of the engine; When the average value of the exhaust temperature at the current moment of the engine and the first predicted exhaust temperature is greater than the upper limit of the preset temperature level, and the second predicted exhaust temperature is greater than the first preset temperature level, control to increase the exhaust of the electronically controlled wastegate turbocharger to increase the exhaust temperature of the engine; When the average value of the exhaust temperature of the engine at the current moment and the first predicted exhaust temperature is greater than the second preset temperature level, and the second predicted exhaust temperature is greater than the first preset temperature level, control to increase the bleeding of the electronically controlled bleed valve supercharger, control to close the throttle opening, and control to increase the opening of the exhaust system valve to increase the exhaust temperature of the engine; Wherein, the first preset temperature level is less than the second preset temperature level, the second preset temperature level is less than the third preset temperature level, the third preset temperature level is less than the fourth preset temperature level, and the fourth preset temperature level is less than the upper limit of the preset temperature level.

2. The engine exhaust temperature management method according to claim 1, wherein The predicting of the first predicted exhaust temperature of the engine at the next moment of the current moment based on the temperature-time curve includes: Determine the current moment on the temperature-time curve and the previous moment the slope of the first temperature-time curve before that; Determine the average value of the slopes, or the minimum value among the slopes, as the first predicted exhaust temperature.

3. The engine exhaust temperature management method according to claim 1, wherein The predicting of the second predicted exhaust temperature of the engine at several subsequent moments of the current moment based on the temperature-time curve includes: Obtain the first exhaust temperature of the engine corresponding to the current moment on the temperature-time curve; Obtain the second exhaust temperature of the engine corresponding to the previous moment of the current moment on the temperature-time curve; Obtain the third exhaust temperature of the engine corresponding to the two previous moments of the current moment on the temperature-time curve; Determine the second predicted exhaust temperature according to the first exhaust temperature, the second exhaust temperature, and the third exhaust temperature.

4. The engine exhaust temperature management method according to claim 3, wherein The calculation formula of the second predicted exhaust temperature is: Wherein, represents the second predicted exhaust temperature; represents the current moment; represents the current moment the exhaust temperature of the engine; represents the current moment the two moments before; represents the current moment the moment before; represents the current moment the moment before the exhaust temperature of the engine.

5. The engine exhaust temperature management method according to claim 1, wherein Further includes: Obtain the torque percentage, determine the load of the engine according to the torque percentage, and determine that the electronically controlled bleed valve supercharger does not perform bleeding treatment according to the load of the engine to ensure the responsiveness or power performance of the engine.

6. The engine exhaust temperature management method according to claim 5, characterized in that When the load of the engine is not greater than the first preset load, it is determined that the electronically controlled bleed valve supercharger does not perform bleeding treatment to ensure the responsiveness of the engine; When the load of the engine is greater than the second preset load, it is determined that the electronically controlled bleed valve supercharger does not perform bleeding treatment to ensure the power performance of the engine.

7. An engine exhaust temperature management device, characterized in that, Includes: An engine data acquisition module, configured to acquire the engine speed and water temperature, set a first preset water temperature for cold start of the engine, set a second preset water temperature for hot start of the engine, and set the minimum exhaust temperature of the engine; A predicted exhaust temperature acquisition module, configured to acquire the temperature-time curve of the engine exhaust temperature changing with time, predict the first predicted exhaust temperature of the engine at the next moment of the current moment based on the temperature-time curve, and predict the second predicted exhaust temperature of the engine at several subsequent moments of the current moment based on the temperature-time curve; A first module, configured to control to close the throttle opening, control to increase the bleeding of the electronically controlled bleed valve supercharger, control to increase the opening of the exhaust gas recirculation control valve, or control to deteriorate the fuel injection parameters when the water temperature of the engine is not greater than the first preset water temperature, or when the water temperature of the engine is not less than the second preset water temperature and the water temperature of the engine is less than the minimum exhaust temperature, so as to increase the engine exhaust temperature; An operating stage determination module, configured to determine that the engine is in the operating stage when the engine speed is not less than the preset speed; The second module is used to control the throttle valve opening to be reduced, control the increase of the exhaust gas of the electronically controlled wastegate turbocharger, control the increase of the exhaust gas recirculation control valve opening, or control the deterioration of the fuel injection parameters to increase the exhaust gas temperature of the engine when the exhaust gas temperature at the current moment of the engine is lower than the minimum exhaust gas temperature during the operation stage of the engine; The third module is used to determine to take heat management measures based on the exhaust gas temperature at the current moment of the engine, the first predicted exhaust gas temperature, and the second predicted exhaust gas temperature to make the exhaust gas temperature of the engine meet the operation requirements when the exhaust gas temperature at the current moment of the engine is higher than the minimum exhaust gas temperature during the operation stage of the engine; The determining to take heat management measures based on the exhaust gas temperature at the current moment of the engine, the first predicted exhaust gas temperature, and the second predicted exhaust gas temperature to make the exhaust gas temperature of the engine meet the operation requirements includes: When the exhaust gas temperature at the current moment of the engine is not higher than the first preset water temperature, the exhaust gas temperature of the engine is increased by controlling the increase of the exhaust gas volume of the electronically controlled wastegate turbocharger, controlling the reduction of the throttle valve opening, controlling the increase of the opening of the valve in the exhaust system, and controlling the deterioration of the fuel injection parameters; When the average value of the exhaust gas temperature at the current moment of the engine and the first predicted exhaust gas temperature is higher than the third preset temperature level, and the first predicted exhaust gas temperature is higher than the fourth preset temperature level, control the increase of the exhaust gas of the electronically controlled wastegate turbocharger, control the reduction of the throttle valve opening, and control the increase of the opening of the valve in the exhaust system to increase the exhaust gas temperature of the engine; When the average value of the exhaust gas temperature at the current moment of the engine and the first predicted exhaust gas temperature is higher than the first preset temperature level, and the second predicted exhaust gas temperature is higher than the second preset temperature level, control the increase of the exhaust gas of the electronically controlled wastegate turbocharger and control the reduction of the throttle valve opening to increase the exhaust gas temperature of the engine; When the average value of the exhaust gas temperature at the current moment of the engine and the first predicted exhaust gas temperature is higher than the upper limit of the preset temperature level, and the second predicted exhaust gas temperature is higher than the first preset temperature level, control the increase of the exhaust gas of the electronically controlled wastegate turbocharger to increase the exhaust gas temperature of the engine; When the average value of the exhaust gas temperature at the current moment of the engine and the first predicted exhaust gas temperature is higher than the second preset temperature level, and the second predicted exhaust gas temperature is higher than the first preset temperature level, control the increase of the exhaust gas of the electronically controlled wastegate turbocharger, control the reduction of the throttle valve opening, and control the increase of the opening of the valve in the exhaust system to increase the exhaust gas temperature of the engine; Wherein, the first preset temperature level is lower than the second preset temperature level, the second preset temperature level is lower than the third preset temperature level, the third preset temperature level is lower than the fourth preset temperature level, and the fourth preset temperature level is lower than the upper limit of the preset temperature level.

8. An electronic device, characterized in that, It includes a memory and a processor, wherein, The memory is used to store programs; The processor is coupled to the memory and is used to execute the programs stored in the memory to implement the steps in the method for managing the exhaust gas temperature of an engine according to any one of claims 1 to 6 above.

9. A computer-readable storage medium, characterized in that, It is used to store computer-readable programs or instructions, and when the programs or instructions are executed by the processor, the steps in the method for managing the exhaust gas temperature of an engine according to any one of claims 1 to 6 above can be implemented.

Images