Vehicle control method and device and vehicle

Abstract

The invention provides a vehicle control method and device and a vehicle. The vehicle comprises an engine with methanol fuel as power. The control method comprises the following steps: obtaining a first quality factor for representing the content of a first impurity in the methanol fuel and a second quality factor for representing the content of a second impurity in the methanol fuel; determining whether the quality of the methanol fuel is abnormal according to the first quality factor and the second quality factor; and under the condition that the methanol fuel quality is abnormal, the engine is controlled to execute an engine protection strategy. Real-time monitoring of the quality of the methanol fuel and real-time protection of the engine can be achieved, the risk of engine damage caused by the quality problem of the methanol fuel can be reduced, and therefore the safety performance of a vehicle with the methanol fuel as power is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a vehicle control method, a vehicle control device and a vehicle. Background Art

[0002] Methanol fuel, as a carrier of hydrogen, is a green fuel with a wide range of applications. At present, the quality assurance measures and quality inspection technologies for methanol fuel in production, transportation, and refueling are still being improved, and the quality of methanol fuel cannot be strictly guaranteed, resulting in uneven quality of methanol fuel on the market. The risk of vehicle failures such as engine damage caused by methanol fuel quality problems cannot be ignored, and the safety risks of vehicle driving also hinder the promotion and application of methanol fuel.

[0003] To solve the above problems, the related art marks the location of methanol filling stations with qualified quality and obtains the vehicle location in real time to determine whether the vehicle is filled with methanol within the specified location range, so as to basically control the methanol instructions filled by the vehicle. However, the related art cannot realize real-time monitoring of the quality of the methanol fuel that has been filled in the vehicle, resulting in the inability to realize real-time engine protection. Summary of the invention

[0004] The present application provides a vehicle control method, a control device and a vehicle to reduce the risk of engine damage due to quality problems of methanol fuel, thereby improving the safety of vehicles powered by methanol fuel.

[0005] The present application provides a control method for a vehicle, the vehicle including an engine powered by methanol fuel; the control method including: obtaining a first quality factor for characterizing the content of a first impurity in the methanol fuel, and a second quality factor for characterizing the content of a second impurity in the methanol fuel; determining whether the methanol fuel has abnormal quality based on the first quality factor and the second quality factor; in the case of abnormal quality of the methanol fuel, controlling the engine to execute an engine protection strategy; wherein controlling the engine to execute the engine protection strategy includes controlling the engine to reduce output power; controlling the engine to reduce output power includes: determining a first torque limit coefficient based on the first quality factor, and determining a second torque limit coefficient based on the second quality factor; taking the product of the smaller of the first torque limit coefficient and the second torque limit coefficient and the current maximum torque of the engine as the second target torque; taking the second target torque as the maximum torque allowed for the engine to run; wherein the torque limit coefficient is less than 1 and greater than or equal to 0, the first torque limit coefficient and the first quality factor are negatively correlated, and the second torque limit coefficient and the second quality factor are negatively correlated.

[0006] Optionally, determining whether the methanol fuel has abnormal quality according to the first quality factor and the second quality factor includes: determining a methanol quality coefficient according to the first quality factor and the second quality factor; and determining whether the methanol fuel has abnormal quality according to the methanol quality coefficient.

[0007] Optionally, determining the methanol quality coefficient according to the first quality factor and the second quality factor includes: taking the product of the first quality factor and the second quality factor as the methanol quality coefficient.

[0008] Optionally, the methanol quality coefficient is positively correlated with the first quality factor and positively correlated with the second quality factor; determining whether the methanol fuel has quality abnormalities according to the methanol quality coefficient includes: when the methanol quality coefficient is greater than a first coefficient threshold, determining that the methanol fuel has quality abnormalities; when the methanol quality coefficient is less than or equal to the first coefficient threshold, determining that the methanol fuel has no quality abnormalities.

[0009] Optionally, when the methanol quality coefficient is greater than a first coefficient threshold, determining that the quality of the methanol fuel is abnormal includes: when the methanol quality coefficient is greater than a second coefficient threshold, determining that the quality of the methanol fuel is seriously abnormal; wherein the second coefficient threshold is greater than the first coefficient threshold.

[0010] Optionally, controlling the engine to execute an engine protection strategy includes: controlling the engine to reduce output power when the methanol quality coefficient is greater than a first coefficient threshold and less than or equal to a second coefficient threshold; and controlling the engine to shut down when the methanol quality coefficient is greater than the second coefficient threshold.

[0011] Optionally, determining whether the methanol fuel has quality abnormalities according to the first quality factor and the second quality factor includes: determining that the methanol has quality abnormalities when the first quality factor is greater than a first quality factor lower limit threshold, or the second quality factor is greater than a second quality factor lower limit threshold; and determining that the methanol has no quality abnormalities when the first quality factor is less than or equal to the first quality factor lower limit threshold, and the second quality factor is less than or equal to the second quality factor lower limit threshold.

[0012] Optionally, when the first quality factor is greater than a first quality factor lower limit threshold, or the second quality factor is greater than a second quality factor lower limit threshold, determining that the methanol quality is abnormal includes: when the first quality factor is greater than a first quality factor upper limit threshold, or the second quality factor is greater than a second quality factor upper limit threshold, determining that the methanol quality is seriously abnormal; wherein the first quality factor upper limit threshold is greater than the first quality factor lower limit threshold, and the second quality factor upper limit threshold is greater than the second quality factor lower limit threshold.

[0013] Optionally, controlling the engine to execute an engine protection strategy includes: controlling the engine to reduce output power when the first quality factor is greater than a first quality factor lower limit threshold and less than or equal to a first quality factor upper limit threshold, or when the second quality factor is greater than a second quality factor lower limit threshold and less than or equal to a second quality factor upper limit threshold; and controlling the engine to shut down when the first quality factor is greater than the first quality factor upper limit threshold, or when the second quality factor is greater than the second quality factor upper limit threshold.

[0014] Optionally, the first impurity is an ionic impurity; the second impurity is an organic chlorine impurity; obtaining a first quality factor for characterizing the content of the first impurity in the methanol fuel, and a second quality factor for characterizing the content of the second impurity in the methanol fuel, includes: obtaining a first polarization current signal of the methanol fuel; determining the first quality factor based on the first polarization current signal; after applying an electrical signal to the methanol fuel, obtaining a second polarization current signal of the methanol fuel; and determining the second quality factor based on the first polarization current signal and the second polarization current signal.

[0015] Optionally, determining the second quality factor according to the first polarization current signal and the second polarization current signal includes: determining the second quality factor according to the difference between the first polarization current signal and the second polarization current signal; or determining a third quality factor according to the second polarization current signal, and determining the second quality factor according to the difference between the third quality factor and the first quality factor.

[0016] The present application provides a vehicle control device, including one or more processors, for implementing the above-mentioned vehicle control method.

[0017] The present application provides a vehicle, comprising: the above-mentioned vehicle control device and an engine electrically connected to the control device, wherein the engine includes an engine powered by methanol fuel.

[0018] The vehicle control method, control device and vehicle provided in the present application obtain a first quality factor and a second quality factor to characterize the content of two different impurities in the methanol fuel filled with the vehicle. Judging whether the quality of the methanol fuel is abnormal based on the first quality factor and the second quality factor is conducive to ensuring the real-time and accuracy of the methanol quality monitoring process. Furthermore, when the methanol quality is abnormal, the engine is automatically controlled to execute the engine protection strategy. In this way, real-time monitoring of the quality of methanol fuel and real-time protection of the engine can be achieved, which is conducive to reducing the risk of engine damage due to methanol fuel quality problems, thereby optimizing the safety performance of vehicles powered by methanol fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a vehicle provided by an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of a vehicle control method provided by an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of a vehicle control method provided by another embodiment of the present application;

[0022] Figure 4 is a schematic diagram of a vehicle control method provided by another embodiment of the present application;

[0023] Figure 5 It is a schematic diagram of a vehicle control method provided by another embodiment of the present application.

[0024] Reference numerals:

[0025] 10: vehicle controller; 201: generator; 202: engine; 203: fuel system; 211: generator controller; 212: engine management system; 301: power battery; 311: battery management system; 401: drive motor; 411: drive motor controller; 50: public CAN. DETAILED DESCRIPTION

[0026] Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings.

[0027] The embodiment of the present application provides a vehicle, including an engine powered by methanol fuel. The vehicle may be a methanol range-extended vehicle or a pure methanol fuel vehicle.

[0028] Combination Figure 1 As shown, a methanol range-extended vehicle is used as an example for explanation. The vehicle includes a vehicle controller 10, a range extender system, a power battery system, and a drive motor system. The range extender system, the power battery system, and the drive motor system are all electrically connected to the vehicle controller 10, and the range extender system and the power battery system are used to control and supply energy to the drive motor system.

[0029] Specifically, the range extender system includes a range extender and a range extender control system. The range extender includes a generator 201, an engine 202 powered by methanol fuel, and a fuel system for providing methanol fuel to the engine 202; the range extender control system is electrically connected to the vehicle controller 10, and includes a generator controller 211 and an engine management system 212. The generator controller 211 is used to control the generator 201, and the engine management system 212 is used to control the engine 202 and the fuel system. The power battery system includes a power battery 301 and a battery management system 311, and the battery management system 311 is connected to the vehicle controller 10. The drive motor system includes a drive motor 401 and a drive motor controller 411, and the drive motor controller 411 is connected to the vehicle controller 10.

[0030] In some embodiments, the vehicle controller 10 communicates with the battery management system 311 through the public CAN (Controller Area Network) 50, and communicates with the engine management system 212 and the generator controller 211 through the internal CAN. The vehicle controller 10 receives hard-wired signals such as the remaining power, remaining fuel, vehicle fault signal, generator fault signal, engine fault signal, and accelerator pedal on the external public CAN 50 and the internal CAN, and determines whether the range extender needs to be started through at least part of these signals, and realizes the power generation control of the range extender.

[0031] The aforementioned vehicle includes a vehicle control device, which includes one or more processors for implementing the vehicle control method. In some embodiments, the control device is an engine management system 212 in the range extender. In some embodiments, the vehicle control device is another controller of the vehicle connected to the range extender, such as the vehicle controller 10 of the vehicle.

[0032] The vehicle further includes a methanol quality sensor connected to at least the control device of the vehicle for detecting the content of the first impurity and the second impurity in the methanol fuel, and at least one methanol quality sensor is provided.

[0033] Combination Figure 2 As shown, an embodiment of the present application provides a vehicle control method, including steps S11 to S13.

[0034] Step S11, obtaining a first quality factor for characterizing the content of a first impurity in the methanol fuel, and a second quality factor for characterizing the content of a second impurity in the methanol fuel.

[0035] After obtaining the content of the first impurity and the content of the second impurity in the methanol fuel through the methanol quality sensor, a first quality factor corresponding to the content of the first impurity and a second quality factor corresponding to the content of the second impurity are determined according to a preset rule.

[0036] The methanol quality sensor operates multiple times in a set working cycle, which is beneficial to ensuring the accuracy of the content of the first impurity and the content of the second impurity.

[0037] Step S12: determining whether the methanol fuel has abnormal quality according to the first quality factor and the second quality factor.

[0038] Step S13, when the quality of methanol fuel is abnormal, controlling the engine to execute an engine protection strategy.

[0039] By adopting the vehicle control method provided in the embodiment of the present application, a first quality factor and a second quality factor are obtained to characterize the content of two different impurities in the methanol fuel filled with the vehicle. Judging whether the quality of the methanol fuel is abnormal based on the first quality factor and the second quality factor is conducive to ensuring the real-time and accuracy of the methanol quality monitoring process. Furthermore, when the methanol quality is abnormal, the engine is automatically controlled to execute the engine protection strategy. In this way, real-time monitoring of the quality of methanol fuel and real-time protection of the engine can be achieved, which is conducive to reducing the risk of engine damage due to methanol fuel quality problems, thereby optimizing the safety performance of vehicles powered by methanol fuel.

[0040] In some embodiments, the first impurity is an ionic impurity, and the second impurity is an organic chlorine impurity. Ionic impurities and organic chlorine impurities are key factors affecting the quality of methanol fuel. Selecting ionic impurities and organic chlorine impurities as monitoring objects is conducive to ensuring the accuracy of methanol fuel quality judgment.

[0041] Here, a more specific description is given of the process of obtaining a first quality factor for characterizing the content of a first impurity in the methanol fuel and a second quality factor for characterizing the content of a second impurity in the methanol fuel. Figure 3 As shown, the aforementioned step S11 includes steps S111 to S114.

[0042] Step S111, obtaining a first polarization current signal of methanol fuel.

[0043] The first polarization current signal is transmitted by the methanol quality sensor to a control device of the vehicle.

[0044] Step S112: determining a first quality factor according to the first polarization current signal.

[0045] Step S113, after applying an electrical signal to the methanol fuel, a second polarization current signal of the methanol fuel is obtained.

[0046] Step S114: determining a second quality factor according to the first polarization current signal and the second polarization current signal.

[0047] The polarization current signal of methanol fuel can directly reflect the content of ionic impurities in methanol fuel. For the convenience of subsequent judgment, the quality factor is used as a setting parameter to reflect the situation of the polarization current signal, that is, to reflect the content of ionic impurities in methanol fuel. The polarization current signal in methanol fuel with different ionic impurity contents is measured in advance through experiments to determine the corresponding relationship between the polarization current signal and the ionic impurity content, and the corresponding relationship between the polarization current signal and the first quality factor is determined accordingly. In this way, the first quality factor corresponding to the current first polarization current signal can be determined according to the corresponding relationship. After measuring the first polarization current signal, an electrical signal is applied to the methanol fuel to convert the organic chlorine in the methanol fuel into chloride ions. At this time, the polarization current signal in the methanol fuel obtained again, that is, the aforementioned second polarization current signal, can reflect the content of organic chlorine before being converted into chloride ions. At the same time, considering that the content of the original ionic impurities in the methanol fuel also affects the second polarization current signal, it is necessary to combine the first polarization current signal and the second polarization current signal to determine the second quality factor that can reflect the content of organic chlorine impurities.

[0048] Specifically, in some embodiments, determining the second quality factor according to the first polarization current signal and the second polarization current signal includes: determining the second quality factor according to the difference between the first polarization current signal and the second polarization current signal. When obtaining the second polarization current signal, the ions in the methanol fuel include both the original ionic impurities and the chloride ions converted from the organic chlorine impurities. Therefore, the difference obtained by subtracting the first polarization current signal from the second polarization current signal can accurately reflect the content of organic chlorine impurities in the methanol fuel. In some embodiments, determining the second quality factor according to the first polarization current signal and the second polarization current signal includes: determining the third quality factor according to the second polarization current signal, and determining the second quality factor according to the difference between the third quality factor and the first quality factor. That is, after first determining the third quality factor corresponding to the second polarization current signal, the first quality factor is subtracted from the third quality factor, and the difference is used as the second quality factor, thereby reflecting the content of organic chlorine impurities in the methanol fuel.

[0049] Next, a specific method of determining whether the methanol fuel has abnormal quality based on the first quality factor and the second quality factor is described.

[0050] Combination Figure 4 As shown, in some embodiments, the step S12, determining whether the methanol fuel has abnormal quality according to the first quality factor and the second quality factor, includes step S1211 and step S1212.

[0051] Step S1211, determining a methanol quality factor according to the first quality factor and the second quality factor.

[0052] Step S1212, determining whether the methanol fuel has abnormal quality according to the methanol quality coefficient.

[0053] In this way, the size and change of the first quality factor and the second quality factor can be reflected by the methanol quality coefficient. The quality of methanol fuel can be judged based on only one parameter, the methanol quality coefficient, which is conducive to simplifying the subsequent judgment logic.

[0054] In some embodiments, a correspondence between the first quality factor, the second quality factor and the methanol quality coefficient is established. The correspondence can be directly expressed in a one-to-one correspondence between data, and the methanol quality coefficient corresponding to the current first quality factor and the second quality factor is directly determined by looking up a table. As shown in Table 1, when the first quality factor is known to be Q11 and the second quality factor is Q21, the corresponding methanol quality coefficient is determined to be K11; when the first quality factor is known to be Q12 and the second quality factor is Q22, the corresponding quality coefficient is determined to be K22, and so on. For values ​​that are not directly disclosed in existing data tables, they can be determined by interpolation calculation based on the disclosed values.

[0055] Table 1:

[0056]

[0057] In some embodiments, the corresponding relationship can also be expressed by a formula. The first quality factor and the second quality factor are used as independent variables, and the methanol quality coefficient is used as a dependent variable, and the value changes with the change of the first quality factor and the second quality factor. In the implementation process, the methanol quality coefficient is directly calculated according to the current first quality factor, the second quality factor and the formula.

[0058] In some embodiments, the methanol quality coefficient is determined according to the first quality factor and the second quality factor, including: taking the product of the first quality factor and the second quality factor as the methanol quality coefficient. In this way, the methanol quality coefficient can accurately reflect the numerical value and change of the first quality factor and the second quality factor, thereby ensuring the accuracy of the judgment of the methanol fuel quality according to the methanol quality coefficient.

[0059] In some embodiments, the methanol quality coefficient is positively correlated with the first quality factor and positively correlated with the second quality factor. Determining whether the methanol fuel has abnormal quality based on the methanol quality coefficient includes: determining that the methanol fuel has abnormal quality when the methanol quality coefficient is greater than the first coefficient threshold; determining that the methanol fuel has no abnormal quality when the methanol quality coefficient is less than or equal to the first coefficient threshold. The larger the methanol quality factor, the larger at least one of the first quality factor and the second quality factor at this time, the content of the first impurity or the second impurity in the methanol fuel is too high, and the methanol fuel quality factor. In this way, the quality of the methanol fuel can be accurately judged.

[0060] Further, in some embodiments, when the methanol quality coefficient is greater than the first coefficient threshold, the quality of the methanol fuel is determined to be abnormal, including: when the methanol quality coefficient is greater than the second coefficient threshold, the quality of the methanol fuel is determined to be seriously abnormal. Wherein, the second coefficient threshold is greater than the first coefficient threshold. When the methanol quality coefficient is greater than the first coefficient threshold and less than or equal to the second coefficient threshold, the quality of the methanol fuel is determined to be generally abnormal. In this way, it is equivalent to further distinguishing the situation of serious quality abnormality on the basis of quality abnormality, making a further detailed distinction on the quality of the methanol fuel, so as to improve the accuracy of subsequent control.

[0061] In some embodiments, controlling the engine to execute an engine protection strategy includes: controlling the engine to reduce output power when the methanol quality coefficient is greater than a first coefficient threshold and less than or equal to a second coefficient threshold; controlling the engine to shut down when the methanol quality coefficient is greater than the second coefficient threshold. This is equivalent to achieving engine protection by controlling the engine to reduce output power when the quality of methanol fuel is generally abnormal, and achieving engine protection by controlling the engine to shut down when the quality of methanol fuel is seriously abnormal. In this way, the engine protection strategy is further refined according to the abnormal quality of methanol fuel, so that the current engine protection strategy is more adapted to current actual needs, thereby improving the accuracy of the engine protection strategy, and further optimizing the engine protection effect. Among them, controlling the engine to reduce output power can be achieved by limiting the maximum torque of the engine, controlling the engine idle speed, and the like.

[0062] Here, the specific implementation method of controlling the engine to reduce the output power is explained. Controlling the engine to reduce the output power includes: determining the torque limit coefficient of the engine according to the methanol quality coefficient; taking the product of the torque limit coefficient and the current maximum torque of the engine as the first target torque; taking the first target torque as the maximum torque allowed for the engine to run. Among them, the torque limit coefficient is less than 1 and greater than or equal to 0, and the torque limit coefficient is negatively correlated with the methanol quality coefficient. In this way, different degrees of torque limit are performed corresponding to methanol quality coefficients of different sizes, thereby realizing the detailed control of the process of controlling the engine to reduce the output power. During the implementation process, the relationship between the methanol quality coefficient and the torque limit coefficient is pre-set, and the torque limit coefficient corresponding to the current methanol quality coefficient is determined according to the relationship. In some embodiments, the relationship between the methanol quality coefficient and the torque limit coefficient can be directly reflected in a one-to-one corresponding numerical value, and the torque limit coefficient corresponding to the current methanol quality coefficient is determined by looking up the table. As shown in Table 2, K1 is equivalent to the aforementioned second coefficient threshold; K2 is equivalent to the aforementioned first coefficient threshold. When the methanol quality coefficient is known to be K1.1, the corresponding torque limit coefficient is determined to be K1.1%; when the methanol quality coefficient is known to be K1.2, the corresponding torque limit coefficient is determined to be K1.2%; and so on. For values ​​that are not directly disclosed in existing data tables, they can be determined by interpolation calculation based on the disclosed values.

[0063] Table 2:

[0064] Methanol quality factor K1 K1.1 K1.2 K1.3 … K1.i … K2 Torque limit coefficient 0 K1.1％ K1.2％ K1.3％ … K1.i% … 100％

[0065] In some embodiments, the relationship between the methanol quality coefficient and the torque limit coefficient can also be expressed in the form of a formula. The formula uses the methanol quality coefficient as an independent variable and the torque limit coefficient as a dependent variable. According to the formula, the torque limit coefficient corresponding to the current methanol quality coefficient can be determined.

[0066] In other embodiments, the relationship between the methanol quality coefficient and the first quality factor and the second quality factor can also be set as follows: the methanol quality coefficient is negatively correlated with the first quality factor and negatively correlated with the second quality factor. In this case, the process of determining whether the methanol fuel has quality abnormalities according to the methanol quality coefficient changes accordingly. Specifically, determining whether the methanol fuel has quality abnormalities according to the methanol quality coefficient includes: determining that the methanol fuel has quality abnormalities when the methanol quality coefficient is greater than the third coefficient threshold; and determining that the methanol fuel has no quality abnormalities when the methanol quality coefficient is less than or equal to the third coefficient threshold.

[0067] Further, when the methanol quality coefficient is less than or equal to the third coefficient threshold, determining that the methanol fuel quality is abnormal includes: when the methanol quality coefficient is less than or equal to the fourth coefficient threshold, determining that the methanol fuel quality is seriously abnormal. Wherein, the fourth coefficient threshold is less than the third coefficient threshold. Controlling the engine to execute the engine protection strategy includes: when the methanol quality coefficient is less than or equal to the third coefficient threshold and greater than the fourth coefficient threshold, controlling the engine to reduce output power; when the methanol quality coefficient is less than or equal to the fourth coefficient threshold, controlling the engine to shut down. The specific execution process of the engine protection strategy is the same as the execution process when the methanol quality coefficient is positively correlated with the first quality factor and the second quality factor, and will not be repeated here.

[0068] Combination Figure 5 As shown, in some embodiments, the aforementioned step S12, determining whether the methanol fuel has abnormal quality according to the first quality factor and the second quality factor, includes step S1221 and step S1222.

[0069] Step S1221: when the first quality factor is greater than the first quality factor lower limit threshold, or the second quality factor is greater than the second quality factor lower limit threshold, it is determined that the methanol quality is abnormal.

[0070] Step S1222: when the first quality factor is less than or equal to the first quality factor lower limit threshold, and the second quality factor is less than or equal to the second quality factor lower limit threshold, it is determined that the methanol has no quality abnormality.

[0071] If the first quality factor is greater than the first quality factor lower limit threshold, it means that the content of the first impurity is too high; if the second quality factor is greater than the second quality factor lower limit threshold, it means that the content of the second impurity is too high, both indicating that the current methanol quality is abnormal. Judging the first quality factor and the second quality factor separately is conducive to reducing missed judgments, thereby improving the accuracy of the methanol fuel quality judgment process.

[0072] Further, in some embodiments, when the first quality factor is greater than the first quality factor lower limit threshold, or the second quality factor is greater than the second quality factor lower limit threshold, the methanol quality is determined to be abnormal, including: when the first quality factor is greater than the first quality factor upper limit threshold, or the second quality factor is greater than the second quality factor upper limit threshold, the methanol quality is determined to be seriously abnormal. Among them, the first quality factor upper limit threshold is greater than the first quality factor lower limit threshold, and the second quality factor upper limit threshold is greater than the second quality factor lower limit threshold. When the first quality factor is less than or equal to the first quality factor upper limit threshold and the second quality factor is less than or equal to the second quality factor upper limit threshold, the methanol quality is determined to be generally abnormal. In this way, it is equivalent to further distinguishing the situation of serious quality abnormality on the basis of the abnormal quality of methanol fuel, and making further detailed distinctions on the quality of methanol fuel to enhance more accurate quality abnormality monitoring. At the same time, subsequent control based on this is conducive to improving the accuracy of subsequent control.

[0073] In some embodiments, controlling the engine to execute the engine protection strategy includes: controlling the engine to reduce output power when the first quality factor is greater than the first quality factor lower limit threshold and less than or equal to the first quality factor upper limit threshold, or when the second quality factor is greater than the second quality factor lower limit threshold and less than or equal to the second quality factor upper limit threshold; controlling the engine to shut down when the first quality factor is greater than the first quality factor upper limit threshold, or when the second quality factor is greater than the second quality factor upper limit threshold. This provides a specific method for determining the engine protection strategy based on the first quality factor and the second quality factor, which is equivalent to protecting the engine by controlling the engine to reduce output power when the quality of methanol fuel is generally abnormal, and protecting the engine by controlling the engine to shut down when the quality of methanol fuel is seriously abnormal. This is conducive to ensuring that the engine protection strategy is consistent with current actual needs, improving the accuracy of the engine protection strategy, and thus optimizing the engine protection effect.

[0074] Among them, in some embodiments, controlling the engine to reduce the output power includes: determining the first torque limit coefficient according to the first quality factor, and determining the second torque limit coefficient according to the second quality factor; taking the product of the smaller of the first torque limit coefficient and the second torque limit coefficient and the current maximum torque of the engine as the second target torque; and taking the second target torque as the maximum torque allowed for the engine to run. Among them, the torque limit coefficient is less than 1 and greater than or equal to 0, the first torque limit coefficient and the first quality factor are negatively correlated, and the second torque limit coefficient and the second quality factor are negatively correlated. In this way, the engine is torque-limited to different degrees according to different situations of the first quality factor and the second quality factor, and the refined control of the process of controlling the engine to reduce the output power is realized, which is conducive to improving the accuracy of the engine protection strategy and optimizing the engine protection effect. After determining the torque limit coefficient according to the first quality factor and the second quality factor respectively, torque limitation is performed according to the smaller torque limit coefficient, so that the current torque limit process can be more in line with the actual engine protection requirements. It can be understood that, in some embodiments, the specific process of controlling the engine to reduce the output power can also be executed as follows: determine the first torque limit coefficient according to the first quality factor, determine the second torque limit coefficient according to the second quality factor, and then determine the target torque according to the first torque limit coefficient and the second torque limit coefficient respectively, with the smaller target torque being used as the final maximum torque allowed for the engine to operate.

[0075] Similar to the aforementioned torque limiting process, here, during the implementation process, it is necessary to pre-set the relationship between the first quality factor and the first torque limiting coefficient, as well as the relationship between the second quality factor and the second torque limiting coefficient, and determine the torque limiting coefficient corresponding to the current first quality factor and the second quality factor according to the pre-set relationship. In some embodiments, the relationship between the first quality factor and the first torque limiting coefficient, as well as the relationship between the second quality factor and the second torque limiting coefficient can be reflected in the form of one-to-one corresponding numerical values, and the first torque limiting coefficient and the second torque limiting coefficient are determined by looking up the table. For example, Table 3 shows the corresponding relationship between the first quality factor and the first torque limiting coefficient, and Table 4 shows the corresponding relationship between the second quality factor and the second torque limiting coefficient. For values ​​that are not directly disclosed in existing data tables, they can be determined by interpolation calculation based on the disclosed values.

[0076] Table 3:

[0077] First quality factor Q11 Q11.1 Q11.2 Q11.3 … Q11.i … Q12 The first torque limit coefficient 0％ x1.1％ x1.2％ x1.3％ … x1.i% … 100％

[0078] Table 4:

[0079] Second quality factor Q21 Q21.1 Q21.2 Q21.3 … Q21.i … Q22 The second torque limit coefficient 0％ x2.1％ x2.2％ x2.3％ … x2.i% … 100％

[0080] In some embodiments, the relationship between the first quality factor and the first torque limit coefficient, and the relationship between the second quality factor and the second torque limit coefficient can be expressed in the form of a formula. With the first quality factor as an independent variable and the first torque limit coefficient as a dependent variable, the first torque limit coefficient corresponding to the current first quality factor is determined according to the formula. With the second quality factor as an independent variable and the second torque limit coefficient as a dependent variable, the second torque limit coefficient corresponding to the current second quality factor can be determined according to the formula.

[0081] Regarding threshold setting, each threshold value and torque limit coefficient in this application can be determined based on the vehicle performance and reliability evaluation such as the extended-range vehicle dynamics of the vehicle under a large number of different quality factor combinations. For methanol-extended-range vehicles with different power configurations, the relevant thresholds need to be adaptively adjusted. For example, relative to methanol-extended-range vehicles, the various thresholds on pure methanol fuel vehicles that are completely powered by methanol fuel need to be strictly controlled, that is, more sensitive quality identification is performed to avoid missed judgments. In methanol-extended-range vehicles, if the power battery has a large amount of power, the various thresholds can be adaptively relaxed.

[0082] In some embodiments, after determining whether the methanol fuel has abnormal quality based on the first quality factor and the second quality factor, the vehicle control method further includes: in the case of abnormal quality of the methanol fuel, issuing a methanol fuel quality abnormality prompt. In this way, it is convenient for users and relevant staff to promptly understand the current abnormal situation so as to carry out relevant processing in a timely manner. The methanol fuel quality abnormality prompt can be issued by means of a prompt light, a prompt sound, a display, or sending a prompt message to the terminal device. Furthermore, different prompt types are selected for different quality abnormalities. That is, different prompt types are selected for the aforementioned general abnormal situation and serious abnormal situation. In this way, it is convenient for users and relevant staff to accurately determine the current abnormal situation.

[0083] In the description of the present disclosure, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A vehicle control method, characterized in that: The vehicle includes an engine powered by methanol fuel; the control method includes: Obtaining a first quality factor for characterizing the content of a first impurity in the methanol fuel, and a second quality factor for characterizing the content of a second impurity in the methanol fuel; determining whether the methanol fuel has abnormal quality according to the first quality factor and the second quality factor; In the case where the quality of the methanol fuel is abnormal, controlling the engine to execute an engine protection strategy; Wherein, the controlling the engine to execute the engine protection strategy includes controlling the engine to reduce output power; the controlling the engine to reduce output power includes: Determine a first torque limit coefficient according to the first quality factor, and determine a second torque limit coefficient according to the second quality factor; taking the product of the smaller one of the first torque limit coefficient and the second torque limit coefficient and the current maximum torque of the engine as the second target torque; taking the second target torque as the maximum torque allowed for the engine to run; The torque limit coefficient is less than 1 and greater than or equal to 0, the first torque limit coefficient is negatively correlated with the first quality factor, and the second torque limit coefficient is negatively correlated with the second quality factor.

2. The control method according to claim 1, characterized in that: The determining whether the methanol fuel has abnormal quality according to the first quality factor and the second quality factor includes: determining a methanol quality factor according to the first quality factor and the second quality factor; Whether the methanol fuel has abnormal quality is determined according to the methanol quality coefficient.

3. The control method according to claim 2, characterized in that: The determining of the methanol quality coefficient according to the first quality factor and the second quality factor comprises: The product of the first quality factor and the second quality factor is used as the methanol quality coefficient.

4. The control method according to claim 2, characterized in that: The methanol quality coefficient is positively correlated with the first quality factor and positively correlated with the second quality factor; The determining whether the methanol fuel has abnormal quality according to the methanol quality coefficient includes: When the methanol quality coefficient is greater than a first coefficient threshold, determining that the methanol fuel quality is abnormal; When the methanol quality coefficient is less than or equal to the first coefficient threshold, it is determined that the methanol fuel has no quality abnormality.

5. The control method according to claim 4, characterized in that: When the methanol quality coefficient is greater than a first coefficient threshold, determining that the quality of the methanol fuel is abnormal includes: When the methanol quality coefficient is greater than a second coefficient threshold, determining that the quality of the methanol fuel is seriously abnormal; The second coefficient threshold is greater than the first coefficient threshold.

6. The control method according to claim 5, characterized in that: The controlling the engine to execute the engine protection strategy includes: When the methanol quality coefficient is greater than the first coefficient threshold and less than or equal to the second coefficient threshold, controlling the engine to reduce output power; When the methanol quality coefficient is greater than the second coefficient threshold, the engine is controlled to stop.

7. The control method according to claim 1, characterized in that: The determining whether the methanol fuel has abnormal quality according to the first quality factor and the second quality factor includes: When the first quality factor is greater than a first quality factor lower limit threshold, or the second quality factor is greater than a second quality factor lower limit threshold, determining that the methanol quality is abnormal; When the first quality factor is less than or equal to the first quality factor lower limit threshold, and the second quality factor is less than or equal to the second quality factor lower limit threshold, it is determined that the methanol has no quality abnormality.

8. The control method according to claim 7, characterized in that: The step of determining that the methanol quality is abnormal when the first quality factor is greater than a first quality factor lower limit threshold or the second quality factor is greater than a second quality factor lower limit threshold comprises: When the first quality factor is greater than a first quality factor upper limit threshold, or the second quality factor is greater than a second quality factor upper limit threshold, determining that the methanol quality is seriously abnormal; The first quality factor upper threshold is greater than the first quality factor lower threshold, and the second quality factor upper threshold is greater than the second quality factor lower threshold.

9. The control method according to claim 8, characterized in that: The controlling the engine to execute the engine protection strategy comprises: When the first quality factor is greater than a first quality factor lower limit threshold and less than or equal to the first quality factor upper limit threshold, or when the second quality factor is greater than a second quality factor lower limit threshold and less than or equal to the second quality factor upper limit threshold, controlling the engine to reduce output power; When the first quality factor is greater than a first quality factor upper limit threshold, or the second quality factor is greater than a second quality factor upper limit threshold, the engine is controlled to stop.

10. The control method according to claim 1, characterized in that: The first impurity is an ionic impurity; the second impurity is an organic chlorine impurity; The step of obtaining a first quality factor for characterizing the content of a first impurity in the methanol fuel and a second quality factor for characterizing the content of a second impurity in the methanol fuel comprises: Obtaining a first polarization current signal of methanol fuel; determining a first quality factor according to the first polarization current signal; After applying an electrical signal to the methanol fuel, obtaining a second polarization current signal of the methanol fuel; A second quality factor is determined according to the first polarization current signal and the second polarization current signal.

11. The control method according to claim 10, characterized in that: The determining a second quality factor according to the first polarization current signal and the second polarization current signal comprises: determining a second quality factor according to a difference between the first polarization current signal and the second polarization current signal; or A third quality factor is determined according to the second polarization current signal, and a second quality factor is determined according to a difference between the third quality factor and the first quality factor.

12. A vehicle control device, characterized in that: The method comprises one or more processors for implementing the vehicle control method as claimed in any one of claims 1 to 11.

13. A vehicle, characterized in that: The vehicle comprises a control device for a vehicle as claimed in claim 12 and an engine electrically connected to the control device, wherein the engine is powered by methanol fuel.

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