An adaptive diesel particulate filter regeneration method, device and vehicle

Abstract

The application provides a self-adaptive diesel engine particle trap regeneration method, device and vehicle, the method comprises the following steps: obtaining the working condition of the diesel engine, obtaining the control parameter of the diesel engine according to the corresponding pulse spectrum of the related parameters of the diesel engine under the corresponding working condition; collecting the temperature of the diesel engine particle trap, operating the diesel engine particle trap with a first preset value, comparing the temperature of the diesel engine particle trap with the regeneration temperature threshold value; if the temperature is less than the threshold value, obtaining the first interpolation or the second interpolation according to the mapping relationship, controlling according to the first interpolation or the second interpolation until the temperature of the diesel engine particle trap is within the preset regeneration temperature threshold value; if the temperature is greater than the upper limit value of the threshold value, the control parameter starts to decrease. The application firstly judges the working condition, obtains the corresponding control parameter and the corresponding control standard according to the working condition, and adjusts the parameter of the diesel engine particle trap in real time during the regeneration process, so that the temperature is prevented from being too low or too high. Different working conditions set different pulse spectrum MAP standard logic, and the influence of road condition change on regeneration is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of exhaust emission aftertreatment of internal combustion engines, and in particular to a self-adaptive diesel particulate filter regeneration method, device and vehicle. BACKGROUND

[0002] Smoke particles are one of the main pollutants in diesel exhaust emissions, and the DPF (Diesel Particulate Fitter) diesel particulate filter system is currently the most effective device for reducing diesel smoke particle emissions. However, as the working time increases, the accumulated smoke particles in the DPF diesel particulate filter system increase, which not only affects the trapping effect, but also causes incomplete combustion of engine fuel, and special measures need to be taken to remove the smoke particles trapped by the DPF diesel particulate filter to achieve DPF regeneration.

[0003] Temperature control is particularly important during DPF regeneration. If the regeneration temperature is insufficient, the carbon particles in the DPF will not be completely burned, and long-term accumulation will cause the DPF to be blocked, thereby causing related on-board diagnostic faults. These faults will result in limited engine torque and insufficient power. On the contrary, if the regeneration temperature is too high, it may cause over-temperature phenomenon during DPF regeneration, which cannot complete the regeneration process. Long-term regeneration failure will also cause the DPF to be blocked. In addition, frequent over-temperature phenomenon during regeneration will damage the DPF and reduce its efficiency of trapping carbon particles, thereby causing speed and torque limiting faults and affecting the normal use of the vehicle. Ultimately, DPF damage will cause vehicle emissions to fail to meet national environmental protection standards, polluting the environment.

[0004] The existing DPF regeneration control strategy generally increases the DPF inlet temperature by controlling the amount of post-injection or exhaust pipe injection when the DPF needs to be regenerated, to achieve rapid ignition of the accumulated particulate matter in the DPF. After the accumulated particulate matter in the DPF is completely oxidized and burned, post-injection or exhaust pipe injection is stopped to complete the regeneration.

[0005] Single MAP calibration logic is based on some typical operating conditions and preset conditions, which is usually calibrated in the laboratory or under specific standard road conditions. However, actual road conditions are constantly changing, and vehicles may encounter various complex situations such as sudden acceleration, sudden deceleration, frequent start-stop, long idle, etc. during driving. In these situations, the variation patterns of engine intake, load, speed and other parameters are quite different from those under standard conditions. Single MAP calibration logic cannot accurately adjust fuel injection and other control parameters in real time according to actual operating conditions, thereby affecting the consistency of DPF regeneration temperature.

[0006] Environmental factors such as altitude, temperature, humidity, etc. have a significant impact on the engine's intake and combustion process. In high altitude areas, the air is thin, the intake pressure is low, and the engine's charge efficiency decreases. The same MAP value corresponds to different actual intake amounts in low altitude areas. In low temperature environment, the air density increases, the fuel atomization and evaporation effect becomes poor, and the combustion process will also be affected. Single MAP calibration logic often cannot well consider the changes of these environmental factors, and cannot effectively adjust and control the regeneration temperature according to the actual environmental conditions.

[0007] Different road conditions, vehicle speed and acceleration are different, which affects the engine exhaust flow, exhaust temperature and exhaust composition, and frequent start and stop also affects the stability of the engine. Different engine loads have different requirements for fuel injection amount, and single MAP calibration logic is difficult to accurately adjust the fuel injection in various road conditions, difficult to ensure the consistency of DPF regeneration temperature, and difficult to quickly adapt to the change of exhaust characteristics caused by road conditions, thereby affecting the stability of the regeneration temperature.

[0008] The existing single pulse MAP calibration logic has limitations, especially in the vehicle consistency and road conditions of the road section, the consistency of the regeneration temperature is often difficult to guarantee. If the constant pulse MAP calibration logic is maintained, it may cause insufficient fuel injection to cause the temperature to be too low or excessive fuel injection to cause the internal temperature of the DPF to rise sharply, i.e. "flying temperature", so that the maximum temperature and temperature gradient inside the DPF during DPF regeneration approach or even exceed the limit that the DPF can withstand, thereby reducing the reliability and durability of the DPF, and in severe cases, even directly causing damage to the DPF, increasing maintenance costs. SUMMARY

[0009] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a self-adaptive diesel particulate filter regeneration method, device and vehicle, which is used to solve the problem that the single pulse MAP calibration logic is used for control during DPF regeneration in the prior art, resulting in too low or too high temperature, resulting in regeneration failure or DPF damage.

[0010] To achieve the above-mentioned purposes and other related purposes, on the one hand, the present application provides a self-adaptive diesel particulate filter regeneration method, comprising:

[0011] Obtaining the working condition of the diesel engine, and obtaining the control parameters of the diesel engine according to the corresponding pulse of the relevant parameters of the diesel engine under the corresponding working condition; starting the regeneration of the diesel particulate filter;

[0012] collecting the temperature of the diesel particulate filter, when the temperature of the diesel particulate filter is greater than the minimum allowable temperature of the regeneration temperature, operating the diesel particulate filter at a first preset value, comparing the temperature of the diesel particulate filter with the threshold value of the regeneration temperature; if the temperature of the diesel particulate filter is less than the lower limit value of the threshold value of the regeneration temperature, obtaining a first interpolation of the control parameter according to the mapping relationship between the current temperature of the diesel particulate filter, the first preset value and the second preset value, obtaining a second interpolation of the control parameter according to the mapping relationship between the current temperature of the diesel particulate filter, the second preset value and the third preset value, controlling the control parameter of the diesel particulate filter from the first interpolation or the second interpolation until the temperature of the diesel particulate filter is within the preset threshold value of the regeneration temperature, and then maintaining the current control parameter value to operate the diesel particulate filter;

[0013] When the temperature of the diesel particulate filter is greater than the upper limit value of the threshold value of the regeneration temperature, the control parameter is reduced from the current value until the temperature of the diesel particulate filter is within the preset threshold value of the regeneration temperature.

[0014] Further, the step of obtaining the first interpolation of the control parameter according to the mapping relationship between the current temperature of the diesel particulate filter, the first preset value and the second preset value, or obtaining the second interpolation of the control parameter according to the mapping relationship between the current temperature of the diesel particulate filter, the second preset value and the third preset value, comprises:

[0015] Obtaining a first coefficient and a second coefficient;

[0016] The first preset value, the second preset value and the first coefficient are corrected by weighted average to correct the first interpolation; the second preset value, the third preset value and the second coefficient are corrected by weighted average to correct the second interpolation.

[0017] Further, the first coefficient is the mapping relationship between the real-time temperature of the diesel particulate filter and the threshold value of the regeneration temperature when the diesel particulate filter is operated at the first preset value and the temperature of the diesel particulate filter cannot be greater than the lower limit value of the threshold value of the regeneration temperature within a preset time; the second coefficient is the mapping relationship between the real-time temperature of the diesel particulate filter and the threshold value of the regeneration temperature when the diesel particulate filter is operated at the second preset value and the temperature of the diesel particulate filter cannot be greater than the lower limit value of the threshold value of the regeneration temperature within a preset time.

[0018] Further, the step of starting the diesel particulate filter specifically means starting the diesel particulate filter at the third preset value until the temperature of the diesel particulate filter is greater than the minimum allowable temperature of the regeneration temperature.

[0019] Further, it further comprises that if the temperature of the diesel particulate filter is greater than the regeneration protection temperature for more than a preset time, the diesel particulate filter regeneration is exited.

[0020] Further, if the diesel particulate filter temperature is greater than the regeneration exit temperature, the diesel particulate filter is regenerated.

[0021] Further, the control parameters at least include air quantity, fuel injection quantity and combustion efficiency.

[0022] In another aspect, the application also discloses an adaptive diesel particulate filter regeneration control device, comprising:

[0023] An acquisition module is configured to acquire the diesel engine working condition and obtain the control parameters of the diesel engine according to the corresponding parameters of the diesel engine corresponding to the working condition.

[0024] A control module is configured to control the start and operation of the diesel particulate filter.

[0025] An acquisition module is configured to acquire the temperature of the diesel particulate filter.

[0026] A judgment module is configured to run the diesel particulate filter at a first preset value when the temperature of the diesel particulate filter is greater than the minimum allowable temperature of the regeneration temperature, compare the temperature of the diesel particulate filter with the regeneration temperature threshold value, and if the temperature of the diesel particulate filter is less than the lower limit value of the regeneration temperature threshold value, obtain a first interpolation value of the control parameters according to the mapping relationship between the current temperature of the diesel particulate filter, the first preset value and the second preset value, obtain a second interpolation value of the control parameters according to the mapping relationship between the current temperature of the diesel particulate filter, the second preset value and the third preset value, control the control parameters of the diesel particulate filter from the first interpolation value or the second interpolation value until the temperature of the diesel particulate filter is within the preset regeneration temperature threshold value, and then maintain the current control parameter value to run the diesel particulate filter.

[0027] When the temperature of the diesel particulate filter is greater than the upper limit value of the regeneration temperature threshold value, the control parameters start to decrease from the current value until the temperature of the diesel particulate filter is within the preset regeneration temperature threshold value.

[0028] Further, the application also discloses a correction module, which is configured to correct the first interpolation value by weighted average according to the first preset value, the second preset value and the first coefficient, and correct the second interpolation value by weighted average according to the second preset value, the third preset value and the second coefficient.

[0029] In another aspect, the application also discloses a vehicle, which adopts the adaptive diesel particulate filter regeneration method to control the diesel particulate filter.

[0030] As described above, the present application has the following beneficial effects: before starting the regeneration of the diesel particulate filter, the working condition of the diesel particulate filter is first judged, the corresponding control parameters and the corresponding control standards are obtained according to the working condition, and during the regeneration of the diesel particulate filter, when the temperature of the diesel particulate filter rises to the lowest allowable temperature of the regeneration temperature, the diesel particulate filter is controlled from the first preset value, the temperature of the diesel particulate filter is compared with the regeneration temperature threshold, the parameters of the diesel particulate filter are adjusted in real time, so that the temperature of the diesel particulate filter is kept within the regeneration temperature threshold, and the temperature is prevented from being too low or too high, so that the diesel particulate filter can successfully complete the regeneration, the reliability and durability of the DPF are effectively improved, and the risk of damage to the DPF is reduced. At the same time, by setting multiple sets of pulse MAP standard logic, different pulse MAP standard logic is used for different working conditions, so as to reduce the influence of road condition changes on the regeneration. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A flowchart of the adaptive diesel particulate filter regeneration method provided by the present application is shown;

[0032] Figure 2 A flowchart of the first interpolation;

[0033] Figure 3 A flowchart of the second interpolation. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. The present application can also be implemented or applied through other different embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application.

[0035] Please refer to Figure 1 The present application provides an adaptive diesel particulate filter regeneration method, comprising:

[0036] In step S10, the working condition of the vehicle is obtained, the control parameters of the diesel engine are obtained according to the pulse corresponding to the diesel engine working condition related parameters, and the regeneration of the diesel particulate filter is started.

[0037] After the DPF of the vehicle is started in various working condition environments such as plains, plateaus, high temperatures and high cold, the injection amount, air amount, combustion efficiency and the like are different. If the same pulse MAP calibration logic is used, it is not conducive to control the temperature of the DPF within the appropriate regeneration temperature range, which may result in regeneration failure. Therefore, the present application specifies the corresponding pulse MAP calibration logic for the diesel engine in different use environments, so that the DPF regeneration is successful.

[0038] In the same kind of working condition environment, the speed, load and other working conditions of the vehicle are collected, such as temperature, pressure difference, carbon load, vehicle speed, etc. When the diesel particulate filter (DPF) meets the starting condition, the diesel particulate filter is started.

[0039] The diesel engine MAP is a two-dimensional or three-dimensional data chart for describing the relationship between the operating parameters of the diesel engine. The diesel engine MAP is a map reflecting the relationship between the operating parameters of the diesel engine obtained by experiment. Common ones include fuel injection quantity MAP and fuel injection timing MAP.

[0040] First, it is necessary to determine whether the vehicle is in a plain, plateau, high temperature or high cold working condition environment, and then select the corresponding MAP standard in the environment.

[0041] For example, when determining the working condition parameters of the vehicle, it is necessary to first determine the current operating condition of the diesel engine, which is usually determined by two basic parameters, namely speed and load. The real-time speed of the diesel engine can be measured by a speed sensor, and the load condition can be determined by the position of the accelerator pedal, a torque sensor, etc. For example, during vehicle driving, different vehicle speeds correspond to different speeds of the diesel engine, and the depth of the accelerator pedal pressed by the driver reflects the load demand. Then, according to the determined speed and load and other working condition parameters, the corresponding control parameter value is found in the corresponding MAP. For example, in the fuel injection quantity MAP, the speed is taken as the horizontal coordinate and the load is taken as the vertical coordinate, and the corresponding value at the intersection of the two is the basic fuel injection quantity under the working condition. Similarly, in the fuel injection timing MAP, the corresponding fuel injection advance angle and other parameters can be found. The control parameters found in the MAP also need to be corrected according to other factors, such as the basic fuel injection quantity which needs to be adjusted according to the environmental temperature, atmospheric pressure, cooling water temperature and other factors. For example, when the environmental temperature is low, the air density is large, and in order to ensure good combustion, the fuel injection quantity needs to be appropriately increased; when the atmospheric pressure is low, the air is thin, and the fuel injection quantity should be reduced.

[0042] In some embodiments, the main control parameters of the diesel particulate filter regeneration include at least air quantity, fuel injection quantity and combustion efficiency, and can also include temperature, air pressure, etc.

[0043] According to the diesel engine after the test, the first preset value, the second preset value and the third preset value of the control parameter are determined, wherein the first preset value, the second preset value and the third preset value increase in turn. The first preset value, the second preset value and the third preset value of the control parameter are different under different use environment working conditions.

[0044] The conditions for starting and controlling the diesel particulate filter are different for different working conditions of the diesel engine, and are also different for different diesel engines. Therefore, corresponding first, second and third preset values are set for each diesel particulate filter in various working conditions.

[0045] The regeneration temperature threshold T2-T3 is the optimal condition for the regeneration of the diesel particulate filter.

[0046] After the diesel particulate filter is started, the diesel engine is started according to the control parameters obtained from the map, and the temperature of the diesel particulate filter is first raised to the minimum allowable regeneration temperature.

[0047] S20, the temperature of the diesel particulate filter is collected, and the temperature of the diesel particulate filter is compared with the minimum allowable regeneration temperature. When the temperature of the diesel particulate filter is greater than the minimum allowable regeneration temperature, the diesel particulate filter is operated at the first preset value.

[0048] After the diesel particulate filter is started, the temperature of the diesel particulate filter is collected in real time. In some embodiments, the collected temperature of the diesel particulate filter refers to the upstream temperature of the DPF, the downstream temperature of the DPF or the internal temperature of the DPF. In this embodiment, the upstream temperature of the DPF is collected.

[0049] In some embodiments, in order to make the temperature of the diesel particulate filter reach the minimum allowable regeneration temperature T1 as soon as possible and shorten the regeneration time, after the DPF meets the regeneration condition, the diesel particulate filter is directly started at the maximum third preset value, so that the temperature of the diesel particulate filter can rise to the minimum allowable regeneration temperature within a certain period of time. At this time, if the diesel particulate filter continues to be operated at the third preset value, the temperature of the diesel particulate filter will rise very quickly and be high, which may exceed the regeneration exit temperature T5 of the diesel particulate filter, thereby burning out the diesel particulate filter. Therefore, when the temperature of the diesel particulate filter is greater than the minimum allowable regeneration temperature T1, the diesel particulate filter is operated at the first preset value.

[0050] After the DPF is started, the temperature of the diesel particulate filter is collected in real time and compared with the regeneration temperature threshold. That is, at the beginning of starting, the real-time temperature of the diesel particulate filter is compared with the lower limit T2 of the regeneration temperature threshold. When it is less than the lower limit T2 of the regeneration temperature threshold, the size of the control parameter is increased from the first preset value, so that the temperature of the diesel particulate filter can be sequentially greater than the lower limit T2 of the regeneration temperature threshold.

[0051] Specifically, when the diesel particulate filter is operated at the first preset value, the temperature of the diesel particulate filter can rise to the lower limit T2 of the regeneration temperature threshold within the preset time, and the parameter of the diesel particulate filter is maintained at the first preset value. When the diesel particulate filter is operated at the first preset value, the temperature of the diesel particulate filter cannot rise to the lower limit T2 of the regeneration temperature threshold within the preset time, and the diesel particulate filter is operated at the second preset value.

[0052] When the diesel particulate filter is operated at the second preset value, the temperature of the diesel particulate filter can rise to the lower limit T2 of the regeneration temperature threshold within the preset time, and the parameter of the diesel particulate filter is maintained at the second preset value. When the diesel particulate filter is operated at the second preset value, the temperature of the diesel particulate filter cannot rise to the lower limit T2 of the regeneration temperature threshold within the preset time, and the diesel particulate filter is operated at the third preset value.

[0053] The first preset value, the second preset value and the third preset value are fixed values of the control parameter of the diesel particulate filter and are unchangeable. However, in actual working conditions, if the diesel particulate filter is controlled at the fixed first preset value, the second preset value and the third preset value, the temperature of the diesel particulate filter can be too low or too high. Therefore, the first interpolation value is set between the first preset value and the second preset value, and the second interpolation value is set between the second preset value and the third preset value.

[0054] Specifically, the first interpolation value is obtained according to the mapping relationship between the first preset value and the second preset value of the diesel particulate filter, and the second interpolation value is obtained according to the mapping relationship between the second preset value and the third preset value of the temperature of the diesel particulate filter.

[0055] When the diesel particulate filter is operated at the first preset value, if the temperature of the diesel particulate filter cannot rise to the lower limit T2 of the regeneration temperature threshold within the preset time, the first interpolation value is used to control the diesel particulate filter until the temperature of the diesel particulate filter is within the preset regeneration temperature threshold, and then the diesel particulate filter is operated at the current control parameter value.

[0056] If the first interpolation value rises to the second preset value, the diesel particulate filter is operated at the second preset value. When the diesel particulate filter is operated at the second preset value, if the temperature of the diesel particulate filter cannot rise to the lower limit T2 of the regeneration temperature threshold within the preset time, the second interpolation value is used to control the diesel particulate filter.

[0057] When the second interpolation value rises to the third preset value, the diesel particulate filter is operated at the third preset value, and the control parameter of the diesel particulate filter is no longer increased.

[0058] The first interpolation and the second interpolation vary with the real-time temperature of the diesel particulate filter, and the first interpolation and the second interpolation are not fixed values, so that the control parameter of the diesel particulate filter is changed according to the temperature of the diesel particulate filter, so that the control parameter is more flexible, the temperature of the diesel particulate filter can reach the regeneration temperature threshold more quickly, and the upper limit T3 of the regeneration temperature threshold is not exceeded too quickly during the operation of the diesel particulate filter.

[0059] In some embodiments, the first interpolation is corrected by weighted average of the first preset value, the second preset value and the first coefficient; and the second interpolation is corrected by weighted average of the second preset value, the third preset value and the second coefficient.

[0060] The first coefficient is a mapping relationship between the temperature of the diesel particulate filter and the regeneration temperature threshold when the temperature of the diesel particulate filter is lower than the second preset value; and the second coefficient is a mapping relationship between the temperature of the diesel particulate filter and the regeneration temperature threshold when the temperature of the diesel particulate filter is lower than the third preset value.

[0061] The first coefficient a is a mapping relationship between the real-time temperature of the diesel particulate filter and the regeneration temperature threshold when the diesel particulate filter is operated at the first preset value and the temperature of the diesel particulate filter cannot be greater than the lower limit value of the regeneration temperature threshold within a preset time. The second coefficient b is a mapping relationship between the real-time temperature of the diesel particulate filter and the regeneration temperature threshold when the diesel particulate filter is operated at the second preset value and the temperature of the diesel particulate filter cannot be greater than the lower limit value of the regeneration temperature threshold within a preset time.

[0062] Specifically, the temperature of the diesel particulate filter and the regeneration temperature threshold form a mapping relationship, and a pulse spectrum MAP is formed between the temperature of the diesel particulate filter and the real-time regeneration temperature of the diesel particulate filter. In this pulse spectrum MAP, the first coefficient a or the second coefficient b of the current temperature of the diesel particulate filter can be obtained in real time, and then the first interpolation is calculated by the first coefficient a, the first preset value and the second preset value, and the second interpolation is calculated by the second coefficient b, the second preset value and the third preset value, as shown in Figure 2 and Figure 3 The first coefficient a and the second coefficient b pulse spectrum diagram are obtained by test calibration.

[0063] The first coefficient a is greater than or equal to 0 and less than or equal to 1, for example, the first interpolation value = first preset value x (1-a) + second preset value x a. When the diesel particulate filter is operated at the first preset value, and the temperature of the diesel particulate filter cannot reach the lower limit T2 of the regeneration temperature threshold within a preset time, a is selected to be equal to 0, the diesel particulate filter is first operated at the first preset value, the value of a is gradually increased, and the first interpolation value is also gradually increased, that is, the control parameter of the diesel particulate filter is gradually increased, until the temperature of the diesel particulate filter is higher than the lower limit T2 of the regeneration temperature threshold.

[0064] When the temperature of the diesel particulate filter is higher than the lower limit T2 of the regeneration temperature threshold, the control parameter of the diesel particulate filter is maintained at the size of the first interpolation value at this time, and the diesel particulate filter continues to be operated.

[0065] The second coefficient b is greater than or equal to 0 and less than or equal to 1, for example, the second interpolation value = second preset value x (1-b) + third preset value x b. When the first coefficient a is gradually increased to 1, the first interpolation value is equal to the second preset value at this time, and the second coefficient b is equal to 0 at this time. When the diesel particulate filter is operated at the second preset value, and the temperature of the diesel particulate filter is not higher than the lower limit T2 of the regeneration temperature threshold within a specified time, the second coefficient b is gradually increased until the temperature of the diesel particulate filter is higher than the lower limit T2 of the regeneration temperature threshold. When the temperature of the diesel particulate filter is higher than the lower limit T2 of the regeneration temperature threshold, the control parameter of the diesel particulate filter is maintained at the size of the second interpolation value at this time, and the diesel particulate filter continues to be operated.

[0066] When b is equal to 1, the second interpolation value is equal to the third preset value at this time. Under normal circumstances, the temperature of the diesel particulate filter will be higher than the lower limit T2 of the regeneration temperature threshold within a preset time, and the diesel particulate filter will be in a normal regeneration state. However, if the temperature of the diesel particulate filter is not higher than the lower limit T2 of the regeneration temperature threshold within a preset time, it indicates that the diesel particulate filter has failed, and the regeneration needs to be stopped and an alarm needs to be given.

[0067] If the temperature exceeds the upper limit T3 of the regeneration temperature threshold, the regeneration effect will be affected, and even the temperature exceeds more, which will lead to regeneration failure, so cooling needs to be performed.

[0068] In the initial start-up process, the interpolation between the diesel particulate filter temperature and the lower limit T2 of the regeneration temperature threshold is negative. With the passage of time, the temperature of the diesel particulate filter will be higher and higher, and the interpolation between the diesel particulate filter temperature and the lower limit T2 of the regeneration temperature threshold is positive. Therefore, the change rule between the first coefficient a when the diesel particulate filter temperature is lower than the lower limit T2 of the regeneration temperature threshold and the first coefficient a when the diesel particulate filter temperature is higher than the lower limit T2 of the regeneration temperature threshold is different. Similarly, the change rule between the second coefficient b when the diesel particulate filter temperature is lower than the lower limit T2 of the regeneration temperature threshold and the second coefficient b when the diesel particulate filter temperature is higher than the lower limit T2 of the regeneration temperature threshold is also different.

[0069] Therefore, according to the data of the diesel engine under various working conditions, the first coefficient a and the second coefficient b in the temperature rising process are obtained, and the first coefficient a and the second coefficient b in the temperature falling process are obtained. When the working conditions of the diesel engine are collected, the corresponding first coefficient and second coefficient are obtained.

[0070] Step S30, when the temperature of the diesel particulate filter is greater than the upper limit of the regeneration temperature threshold, the control parameter starts to decrease from the current value until the temperature of the diesel particulate filter is within the preset regeneration temperature threshold.

[0071] When the temperature of the diesel particulate filter exceeds the upper limit T3 of the regeneration temperature threshold, if the temperature continues to rise, it will affect the regeneration effect, and even burn out the diesel particulate filter, therefore, when the temperature of the diesel particulate filter exceeds the upper limit T3 of the regeneration temperature threshold, the control parameter of the diesel particulate filter needs to be reduced until the temperature of the diesel particulate filter is lower than the upper limit T3 of the regeneration temperature threshold. For example, if the control parameter at this time is the third preset value, the control parameter is reduced to the second interpolation, the change of the second coefficient b in the temperature falling process is different from the change of the second coefficient b in the temperature rising process, and the second coefficient b gradually decreases in the temperature falling process,

[0072] When the temperature of the diesel particulate filter exceeds the upper limit of the regeneration temperature threshold T3, the second coefficient b is less than 1, the second interpolation = the second preset value x (1-b) + the third preset value x b, at this time the result obtained by the second interpolation is less than the third preset value, according to the pulse map in the cooling process, the size of the second coefficient b corresponding to the temperature of the diesel particulate filter is obtained in real time, the value of the control parameter is reduced, and the temperature of the diesel particulate filter will be reduced. When the second coefficient b is reduced to 0, the second interpolation is equal to the second preset value. If the temperature of the diesel particulate filter is still higher than the upper limit of the regeneration temperature threshold T3 within the preset time, the first interpolation is used to operate the diesel particulate filter. At this time, the first coefficient a is less than 1, the first interpolation = the first preset value x (1-a) + the second preset value x a, according to the pulse map in the cooling process, the size of the first coefficient a corresponding to the temperature of the diesel particulate filter is obtained in real time, the value of the control parameter is reduced, and the temperature of the diesel particulate filter will be reduced. When the first coefficient a is reduced to 0, the first interpolation is equal to the first preset value. If the temperature of the diesel particulate filter is not lower than the upper limit of the regeneration temperature threshold T3 within the preset time, it indicates that the diesel particulate filter fails, the regeneration is stopped, and an alarm is given. The preset time of each stage may be the same or different.

[0073] Step S40, if the temperature of the diesel particulate filter is greater than the regeneration protection temperature for more than a preset time, the diesel particulate filter regeneration is exited.

[0074] In the DPF regeneration process, the size of the control parameter is adjusted in real time. The most ideal state is to make the temperature of the DPF between the lower limit of the regeneration temperature threshold T2 and the upper limit of the regeneration temperature threshold T3. If the temperature of the diesel particulate filter exceeds the regeneration protection temperature T4 during the regeneration process, although the temperature does not exceed the upper limit of the regeneration temperature threshold, the long time at this temperature will reduce the durability of the DPF. Therefore, when the regeneration temperature is greater than the regeneration protection temperature T4, the system will take protective measures for the diesel particulate filter, for example, timing starts from when the temperature of the diesel particulate filter exceeds the regeneration protection temperature T4, and the diesel particulate filter regeneration is exited when the preset time is exceeded, thereby avoiding the diesel particulate filter from being burned out.

[0075] Step S50, if the temperature of the diesel particulate filter is greater than the regeneration exit temperature, the diesel particulate filter regeneration is exited.

[0076] If the temperature of the diesel particulate filter exceeds the regeneration protection temperature T4 and rises to the regeneration exit temperature T5 within the preset protection time, the regeneration is immediately exited, and the diesel particulate filter is protected.

[0077] The vehicle condition is detected, when the regeneration condition is reached, the working condition of the vehicle is collected, the environment of the vehicle at this time is judged, the preset value standard and the pulse spectrum of the first coefficient a and the pulse spectrum of the second coefficient b under the corresponding environment are selected. First, the control parameter is started with the third preset value corresponding to the environment to start the diesel particulate filter, the temperature of the diesel particulate filter is detected in real time, when the temperature is greater than the minimum allowable temperature T1 of the regeneration temperature, the diesel particulate filter is first operated with the first preset value, if the temperature cannot be greater than the lower limit value T2 of the regeneration temperature threshold within a preset time, the corresponding first coefficient value a is obtained according to the first coefficient a pulse spectrum corresponding to the temperature rising process, then the first interpolation is calculated, the first interpolation is adjusted in real time until the temperature of the diesel particulate filter is higher than the lower limit value T2 of the regeneration temperature threshold. If the first interpolation is corrected to be equal to the second preset value, the temperature of the diesel particulate filter cannot be higher than the lower limit value T2 of the regeneration temperature threshold within a preset time, the corresponding second coefficient b is obtained by using the second coefficient b pulse spectrum in the temperature rising process, then the second interpolation is calculated, the second interpolation gradually increases until the temperature of the diesel particulate filter is higher than the lower limit value T2 of the regeneration temperature threshold. If the second interpolation rises to the third preset value, the temperature of the diesel particulate filter can be higher than the lower limit value T2 of the regeneration temperature threshold within a preset time under normal circumstances, if the temperature of the diesel particulate filter cannot be higher than the lower limit value T2 of the regeneration temperature threshold at this time, it indicates that the diesel particulate filter has a fault.

[0078] In the process of changing the control parameter, when the temperature of the diesel particulate filter is higher than the lower limit value T2 of the regeneration temperature threshold, the control parameter is no longer changed, and the diesel particulate filter is operated with the current value of the control parameter.

[0079] When the temperature of the diesel particulate filter exceeds the upper limit value T3 of the regeneration temperature threshold, it is gradually reduced from the current value, and the difference between the current temperature and the lower limit value T2 of the regeneration temperature threshold can be used to judge whether the diesel particulate filter is in a temperature rising state or a temperature falling state. After judging that it is in a temperature falling state, the corresponding first coefficient a or second coefficient b is obtained, then the first interpolation or second interpolation is calculated, and the control parameter is gradually reduced, so that the temperature of the diesel particulate filter is lower than the upper limit value T3 of the regeneration temperature threshold and higher than the lower limit value T2 of the regeneration temperature threshold.

[0080] When the time when the temperature of the diesel particulate filter exceeds the regeneration protection temperature T4 exceeds a preset time, the diesel particulate filter regeneration is exited, or when the temperature of the diesel particulate filter is greater than the regeneration exit temperature, the diesel particulate filter regeneration is exited, so as to protect the diesel particulate filter.

[0081] On the other hand, the application also provides a self-adaptive diesel particulate filter regeneration control device, comprising:

[0082] An acquisition module is configured to acquire a working condition of the diesel engine and obtain a control parameter of the diesel engine according to a corresponding pulse spectrum of a related parameter of the diesel engine under the corresponding working condition.

[0083] A control module is configured to control starting and running of the diesel engine particulate filter.

[0084] An acquisition module is configured to acquire a temperature of the diesel engine particulate filter.

[0085] A judgment module is configured to run the diesel engine particulate filter at a first preset value when the temperature of the diesel engine particulate filter is greater than a minimum allowable temperature of a regeneration temperature, compare the temperature of the diesel engine particulate filter with a regeneration temperature threshold value, if the temperature of the diesel engine particulate filter is less than a lower limit value of the regeneration temperature threshold value, obtain a first interpolation of the control parameter according to a mapping relationship between a current temperature of the diesel engine particulate filter, the first preset value and a second preset value, obtain a second interpolation of the control parameter according to a mapping relationship between the current temperature of the diesel engine particulate filter, the second preset value and a third preset value, control the control parameter of the diesel engine particulate filter from the first interpolation or the second interpolation until the temperature of the diesel engine particulate filter is within the preset regeneration temperature threshold value, and then maintain a current control parameter value to run the diesel engine particulate filter.

[0086] When the temperature of the diesel engine particulate filter is greater than an upper limit value of the regeneration temperature threshold value, the control parameter starts to decrease from a current value until the temperature of the diesel engine particulate filter is within the preset regeneration temperature threshold value.

[0087] A correction module is configured to correct the first interpolation by weighted average according to the first preset value, the second preset value and a first coefficient, and correct the second interpolation by weighted average according to the second preset value, the third preset value and a second coefficient.

[0088] In another aspect, the application further provides a vehicle, which adopts the adaptive diesel engine particulate filter regeneration method to control the diesel engine particulate filter.

[0089] It should be noted that the flowchart and block diagrams in the drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams can represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions noted in the block can occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or the blocks can sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each of the blocks of the block diagrams and / or flowchart illustrations, and combinations thereof, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or combinations of hardware and software.

[0090] The units described in the embodiments of the present application can be implemented by software, or by hardware, or by a combination of software and hardware. The units described can be located in a single processor, or can be distributed over multiple processors. In some cases, the names of the units described should not be construed as a limitation of the units themselves. The units or modules described can be located in a processor, for example, a processor can be described as including a data acquisition module, a first processing module, a second processing module, and a result generation module. In some cases, the names of the units or modules described should not be construed as a limitation of the units or modules themselves.

[0091] The above description is merely illustrative of the embodiments of the present application and the principles of the technology involved. It should be understood by those skilled in the art that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combinations of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features can be replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. An adaptive diesel particulate filter regeneration method, characterized by, The method comprises the following steps: acquiring the working condition of the diesel engine, and obtaining the control parameter of the diesel engine according to the corresponding parameter pulse spectrum of the diesel engine under the corresponding working condition; starting the regeneration of the diesel particulate filter; collecting the temperature of the diesel particulate filter, and running the diesel particulate filter at a first preset value when the temperature of the diesel particulate filter is greater than the minimum allowable temperature of the regeneration temperature threshold; comparing the temperature of the diesel particulate filter with the regeneration temperature threshold, and if the temperature of the diesel particulate filter is less than the lower limit value of the regeneration temperature threshold, obtaining a first interpolation value of the control parameter according to the mapping relationship between the current temperature of the diesel particulate filter, the first preset value and the second preset value, or obtaining a second interpolation value of the control parameter according to the mapping relationship between the current temperature of the diesel particulate filter, the second preset value and the third preset value, controlling the control parameter of the diesel particulate filter by the first interpolation value or the second interpolation value until the temperature of the diesel particulate filter is within the preset regeneration temperature threshold; then maintaining the current control parameter value to run the diesel particulate filter; wherein the first preset value, the second preset value and the third preset value increase in turn; when the temperature of the diesel particulate filter is greater than the upper limit value of the regeneration temperature threshold, the control parameter starts to decrease from the current value, so that the temperature of the diesel particulate filter is within the preset regeneration temperature threshold.

2. The method of claim 1, wherein, The method comprises the following steps: obtaining the first coefficient and the second coefficient; correcting the first interpolation value by weighted average of the first preset value, the second preset value and the first coefficient; correcting the second interpolation value by weighted average of the second preset value, the third preset value and the second coefficient. The first coefficient is the mapping relationship between the real-time temperature of the diesel particulate filter and the regeneration temperature threshold when the diesel particulate filter is run at the first preset value and the temperature of the diesel particulate filter cannot be greater than the lower limit value of the regeneration temperature threshold within a preset time; the second coefficient is the mapping relationship between the real-time temperature of the diesel particulate filter and the regeneration temperature threshold when the diesel particulate filter is run at the second preset value and the temperature of the diesel particulate filter cannot be greater than the lower limit value of the regeneration temperature threshold within a preset time.

3. The method of claim 2, wherein, The diesel particulate filter regeneration start is specifically to start the regeneration of the diesel particulate filter at the third preset value until the temperature of the diesel particulate filter is greater than the minimum allowable temperature of the regeneration temperature.

4. The method of claim 1-3, wherein, If the temperature of the diesel particulate filter is greater than the regeneration protection temperature for more than a preset time, the diesel particulate filter regeneration is exited.

5. The method of claim 4, wherein, If the temperature of the diesel particulate filter is greater than the regeneration exit temperature, the diesel particulate filter regeneration is exited.

6. The method of claim 4, wherein, The control parameter at least includes air quantity, fuel injection quantity and combustion efficiency.

7. The method of claim 1, wherein, The method comprises the following steps:

8. An adaptive diesel particulate filter regeneration control device characterized by comprising: an acquisition module is configured to acquire the working condition of the diesel engine, and obtain the control parameter of the diesel engine according to the corresponding parameter pulse spectrum of the diesel engine under the corresponding working condition; ​ A control module is configured to control the start and operation of the diesel particulate filter regeneration. A collection module is configured to collect the temperature of the diesel particulate filter. A judgment module is configured to operate the diesel particulate filter at a first preset value when the temperature of the diesel particulate filter is greater than the minimum allowable temperature of the regeneration temperature; compare the temperature of the diesel particulate filter with the threshold value of the regeneration temperature; if the temperature of the diesel particulate filter is less than the lower limit value of the threshold value of the regeneration temperature, derive a first interpolation of the control parameter according to the mapping relationship between the current temperature of the diesel particulate filter, the first preset value and the second preset value, or derive a second interpolation of the control parameter according to the mapping relationship between the current temperature of the diesel particulate filter, the second preset value and the third preset value, control the control parameter of the diesel particulate filter from the first interpolation or the second interpolation until the temperature of the diesel particulate filter is within the preset threshold value of the regeneration temperature; then maintain the current control parameter value to operate the diesel particulate filter; wherein the first preset value, the second preset value and the third preset value increase in turn; When the temperature of the diesel particulate filter is greater than the upper limit value of the threshold value of the regeneration temperature, the control parameter starts to decrease from the current value so that the temperature of the diesel particulate filter is within the preset threshold value of the regeneration temperature.

9. The adaptive diesel particulate filter regeneration control device of claim 8, wherein, A correction module is configured to correct the first interpolation by weighted average according to the first preset value, the second preset value and the first coefficient, and correct the second interpolation by weighted average according to the second preset value, the third preset value and the second coefficient.

10. A vehicle characterized by comprising: The vehicle adopts the adaptive diesel particulate filter regeneration method of any one of claims 1-7 to control the diesel particulate filter.

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