Carbon deposition control method and system

Abstract

The present invention provides a carbon deposition control method and system, the method comprising: obtaining a current carbon load of a DPF, a current SOC and operating point parameters corresponding to a plurality of alternative power generation operating points when a range extender of a vehicle is running; controlling the range extender to maintain a currently enabled power generation mode based on the current carbon load, or controlling the range extender to enable a fixed-point power generation mode; when the range extender enables the fixed-point power generation mode, calculating a unit carbon removal fuel consumption corresponding to the alternative power generation operating point using the current SOC and operating point parameters; selecting a fixed-point power generation operating point from a plurality of alternative power generation operating points according to the unit carbon removal fuel consumption; and controlling the range extender to operate at the fixed-point power generation operating point to control the carbon deposition of the DPF within a specified range, avoid frequent active regeneration and driving regeneration, reduce the vehicle use cost and take into account the vehicle power.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon deposit control, and in particular to a carbon deposit control method and system. Background Art

[0002] For the carbon deposits in the engine exhaust treatment device (post-treatment), vehicles equipped with range extenders deal with the carbon deposits through active regeneration and driving regeneration. However, when the carbon deposit rate of the diesel particulate filter (DPF) is fast, active regeneration and driving regeneration are required frequently, which increases the cost of the vehicle and affects the power of the vehicle. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a carbon deposit control method and system to solve the problems of increased vehicle use cost and impact on vehicle power when dealing with carbon deposits through active regeneration and driving regeneration.

[0004] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0005] A first aspect of an embodiment of the present invention discloses a carbon deposition control method, the method comprising:

[0006] When the range extender of the vehicle is running, obtaining the current carbon load of the diesel particulate filter DPF, the current SOC and operating point parameters corresponding to multiple alternative power generation operating points, wherein the operating point parameters at least include power generation efficiency, carbon removal rate, speed, torque and engine fuel consumption rate;

[0007] Based on the current carbon load, controlling the range extender to maintain the currently enabled power generation mode, or controlling the range extender to enable a fixed-point power generation mode;

[0008] When the range extender uses the fixed-point power generation mode, the fuel consumption per unit carbon elimination corresponding to the alternative power generation operating point is calculated using the current SOC and the operating point parameters;

[0009] According to the unit carbon removal amount fuel consumption, selecting a fixed-point power generation operating point from a plurality of the alternative power generation operating points;

[0010] The range extender is controlled to operate at the fixed-point power generation operating point to control the carbon deposit of the DPF within a specified range.

[0011] Preferably, based on the current carbon load, controlling the range extender to maintain the currently enabled power generation mode, or controlling the range extender to enable a fixed-point power generation mode, includes:

[0012] Determining whether the current carbon load is less than or equal to a first carbon load threshold;

[0013] If the current carbon load is less than or equal to the first carbon load threshold, controlling the range extender to maintain the currently enabled power generation mode;

[0014] If the current carbon loading is greater than the first carbon loading threshold, determining whether the current carbon loading is greater than or equal to a second carbon loading threshold;

[0015] If the current carbon load is less than the second carbon load threshold, controlling the range extender to maintain the currently enabled power generation mode;

[0016] If the current carbon load threshold is greater than or equal to the second carbon load threshold, the range extender is controlled to enable fixed-point power generation mode.

[0017] Preferably, when the range extender uses the fixed-point power generation mode, the current SOC and the operating point parameters are used to calculate the unit carbon consumption corresponding to the alternative power generation operating point, including:

[0018] When the range extender uses the fixed-point power generation mode, the target power generation is calculated using the current SOC, the preset target SOC and the total power of the power battery of the vehicle;

[0019] Calculate the shortest operation time corresponding to the alternative power generation operating point according to the target power generation and the power generation efficiency, speed and torque corresponding to the alternative power generation operating point;

[0020] Calculate the carbon removal amount corresponding to the alternative power generation operating point by using the shortest operating time and carbon removal rate corresponding to the alternative power generation operating point;

[0021] The fuel consumption per unit carbon removal amount corresponding to the alternative power generation operating point is calculated according to the target power generation amount and in combination with the carbon removal amount, power generation efficiency and engine fuel consumption rate corresponding to the alternative power generation operating point.

[0022] Preferably, according to the unit carbon removal amount fuel consumption, selecting a fixed power generation operating point from a plurality of the alternative power generation operating points comprises:

[0023] Calculate the average power demand of the vehicle within a specified time period;

[0024] According to the order of the fuel consumption per unit of carbon removal from low to high, the alternative power generation operating point that meets the average power demand of the whole vehicle and has the lowest fuel consumption per unit of carbon removal is selected as the fixed-point power generation operating point.

[0025] Preferably, the alternative power generation operating point is an operating point where the load is higher than a load threshold, the after-treatment exhaust temperature is higher than a temperature threshold, and the engine fuel consumption rate is lower than a fuel consumption rate threshold.

[0026] A second aspect of an embodiment of the present invention discloses a carbon deposition control system, the system comprising:

[0027] An acquisition unit, used to acquire the current carbon load of the diesel particulate filter DPF, the current SOC and operating point parameters corresponding to a plurality of alternative power generation operating points when the range extender of the vehicle is running, wherein the operating point parameters at least include power generation efficiency, carbon removal rate, speed, torque and engine fuel consumption rate;

[0028] A first control unit is used to control the range extender to maintain a currently enabled power generation mode based on the current carbon load, or to control the range extender to enable a fixed-point power generation mode;

[0029] a calculation unit, configured to calculate the unit carbon elimination fuel consumption corresponding to the alternative power generation operating point by using the current SOC and the operating point parameter when the range extender enables the fixed-point power generation mode;

[0030] A selection unit, configured to select a fixed-point power generation operating point from a plurality of the candidate power generation operating points according to the unit carbon removal amount fuel consumption;

[0031] The second control unit is used to control the range extender to operate at the fixed-point power generation operating point to control the carbon deposit of the DPF within a specified range.

[0032] Preferably, the first control unit includes:

[0033] A first judgment module, used to judge whether the current carbon loading is less than or equal to a first carbon loading threshold;

[0034] A first control module, configured to control the range extender to maintain a currently enabled power generation mode if the current carbon load is less than or equal to the first carbon load threshold;

[0035] a second judgment module, configured to judge whether the current carbon loading is greater than or equal to a second carbon loading threshold if the current carbon loading is greater than the first carbon loading threshold;

[0036] The second control module is used to control the range extender to maintain the currently enabled power generation mode if the current carbon load is less than the second carbon load threshold; if the current carbon load threshold is greater than or equal to the second carbon load threshold, control the range extender to enable the fixed-point power generation mode.

[0037] Preferably, the calculation unit comprises:

[0038] A first calculation module, configured to calculate a target power generation amount by using the current SOC, a preset target SOC and a total power of the power battery of the vehicle when the range extender enables a fixed-point power generation mode;

[0039] A second calculation module is used to calculate the shortest operation time corresponding to the alternative power generation operating point according to the target power generation and the power generation efficiency, speed and torque corresponding to the alternative power generation operating point;

[0040] A third calculation module is used to calculate the carbon removal amount corresponding to the alternative power generation operating point by using the shortest operating time corresponding to the alternative power generation operating point and the carbon removal rate;

[0041] The fourth calculation module is used to calculate the unit carbon removal fuel consumption corresponding to the alternative power generation operating point based on the target power generation, combined with the carbon removal amount, power generation efficiency and engine fuel consumption rate corresponding to the alternative power generation operating point.

[0042] Preferably, the selection unit is specifically used to: calculate the average power demand of the vehicle within a specified time period; and select the alternative power generation operating point that meets the average power demand of the vehicle and has the lowest unit carbon removal fuel consumption as the fixed-point power generation operating point in the order of the unit carbon removal fuel consumption from low to high.

[0043] Preferably, the alternative power generation operating point is an operating point where the load is higher than a load threshold, the after-treatment exhaust temperature is higher than a temperature threshold, and the engine fuel consumption rate is lower than a fuel consumption rate threshold.

[0044] A carbon deposition control method and system are provided based on the above-mentioned embodiment of the present invention. The method comprises: when the range extender of the vehicle is running, obtaining the current carbon load of the DPF, the current SOC and the operating point parameters corresponding to multiple alternative power generation operating points; based on the current carbon load, controlling the range extender to maintain the currently enabled power generation mode, or controlling the range extender to enable the fixed-point power generation mode; when the range extender enables the fixed-point power generation mode, using the current SOC and the operating point parameters, calculating the unit carbon removal fuel consumption corresponding to the alternative power generation operating point; selecting the fixed-point power generation operating point from multiple alternative power generation operating points according to the unit carbon removal fuel consumption; and controlling the range extender to operate at the fixed-point power generation operating point to control the carbon deposition of the DPF within a specified range. This solution determines whether to enable the fixed-point power generation mode based on the current carbon load; when the fixed-point power generation mode is enabled, the operating point parameters corresponding to the alternative power generation operating point are used to select the fixed-point power generation operating point, and the range extender is controlled to operate at the fixed-point power generation operating point to control the carbon deposits of the DPF within a specified range, avoid frequent active regeneration and driving regeneration, reduce the vehicle's cost and take into account the vehicle's power. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0046] Figure 1 A flow chart of a carbon deposition control method provided by an embodiment of the present invention;

[0047] Figure 2 A flow chart for calculating fuel consumption per unit carbon removal provided by an embodiment of the present invention;

[0048] Figure 3 Another flow chart of a carbon deposition control method provided by an embodiment of the present invention;

[0049] Figure 4 A structural block diagram of a carbon deposition control system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0052] Before explaining this plan, some terms are explained here to better understand the subsequent explanation content of this plan.

[0053] SOC (State of Charge): Battery state of charge, reflecting the remaining capacity of the battery. Its numerical value is defined as the ratio of the remaining battery capacity to the battery capacity, usually expressed as a percentage.

[0054] DPF: Diesel Particulate Filter is a post-treatment technology to control PM (particulate matter) and PN (particulate number) emissions from diesel engines.

[0055] Range extender: A device that can provide electrical energy to the outside, usually including an engine, a generator, and a coupling device between the two.

[0056] Fixed-point power generation mode: A power generation mode of the range extender that maintains stable operating conditions for power generation based on the current power and battery power.

[0057] Passive regeneration: When the engine aftertreatment temperature is appropriate (usually between 250°C and 350°C), DPF carbon deposits react chemically with NO2 in the exhaust gas under the action of the catalyst to generate CO2 and NO.

[0058] At present, the power generation method of the range extender only considers the power demand and economy of the whole vehicle. For the carbon deposit in the post-treatment, it is only handled through traditional active regeneration and driving regeneration (entered under high load conditions); however, for engineering machinery with more stringent working conditions, the carbon deposition rate of DPF is faster, which requires frequent active regeneration and driving regeneration, which leads to an increase in the cost of the whole vehicle and affects the power of the whole vehicle.

[0059] To solve the above problems, this solution proposes a carbon deposit control method and system, which determines whether to enable the fixed-point power generation mode according to the current carbon load; when the fixed-point power generation mode is enabled, the operating point parameters corresponding to the alternative power generation operating point are used to select the fixed-point power generation operating point, and the range extender is controlled to operate at the fixed-point power generation operating point to control the carbon deposits of the DPF within a specified range, fully utilizing the passive regeneration function of the engine aftertreatment, avoiding frequent active regeneration and driving regeneration, reducing the vehicle use cost and taking into account the vehicle power.

[0060] See also Figure 1 , shows a flow chart of a carbon deposition control method provided by an embodiment of the present invention, the carbon deposition control method comprising:

[0061] Step S101: when the range extender of the vehicle is running, the current carbon load of the DPF, the current SOC and the operating point parameters corresponding to the multiple alternative power generation operating points are obtained.

[0062] In the process of implementing step S101, when the vehicle's range extender is running, the controller obtains data such as the current carbon load of the DPF, the current SOC, operating point parameters corresponding to multiple alternative power generation operating points, and airspeed. The operating point parameters corresponding to the alternative power generation operating points include at least: power generation efficiency, carbon removal rate, speed, torque, engine fuel consumption rate, post-treatment exhaust temperature, etc.

[0063] It should be noted that the post-treatment exhaust temperature refers to the exhaust temperature of the engine exhaust treatment device. When obtaining the carbon removal rate corresponding to the alternative power generation operating point, the carbon removal rate corresponding to the alternative power generation operating point can be obtained based on the operating conditions of the alternative power generation operating point and the current carbon load (that is, the passive regeneration carbon removal rate is obtained).

[0064] That is to say, when the range extender is running, the controller obtains data such as the current carbon load, current SOC, power generation efficiency corresponding to the alternative power generation operating point, carbon elimination rate, speed, torque, engine fuel consumption rate, and post-treatment exhaust temperature.

[0065] The unit of engine fuel consumption rate is g / kWh.

[0066] In some embodiments, the alternative power generation operating point is an operating point where the load is higher than a load threshold, the after-treatment exhaust temperature is higher than a temperature threshold, and the engine fuel consumption rate is lower than a fuel consumption rate threshold.

[0067] That is to say, a portion of operating points with higher load, higher after-treatment exhaust temperature and lower engine fuel consumption rate are preset as alternative power generation operating points.

[0068] Step S102: Based on the current carbon load, the range extender is controlled to maintain the currently enabled power generation mode, or the range extender is controlled to enable the fixed-point power generation mode.

[0069] In the specific implementation of step S102, based on the comparison result between the current carbon loading and the first carbon loading threshold value, and based on the comparison result between the current carbon loading and the second carbon loading threshold value, the range extender is controlled to maintain the currently enabled power generation mode (equivalent to maintaining the current power generation mode), or the range extender is controlled to enable the fixed-point power generation mode (equivalent to selecting the fixed-point power generation mode).

[0070] It should be noted that the first carbon loading threshold can be set to a set carbon loading 1, and the second carbon loading threshold can be set to a set carbon loading 2 or a set carbon loading 3, wherein one of the values ​​of the set carbon loading 1 is 1.5 g / L, one of the values ​​of the set carbon loading 2 is "set carbon loading 1+0.2 g / L", and one of the values ​​of the set carbon loading 3 is 2.0 g / L.

[0071] In some embodiments, the specific method of determining whether to maintain the current power generation mode or select the fixed-point power generation mode is: determining whether the current carbon load is less than or equal to the first carbon load threshold; if the current carbon load is less than or equal to the first carbon load threshold, controlling the range extender to maintain the currently enabled power generation mode;

[0072] If the current carbon load is greater than the first carbon load threshold, determining whether the current carbon load is greater than or equal to the second carbon load threshold;

[0073] If the current carbon load is less than the second carbon load threshold, the range extender is controlled to maintain the currently enabled power generation mode;

[0074] If the current carbon load threshold is greater than or equal to the second carbon load threshold, the range extender is controlled to enable the fixed-point power generation mode.

[0075] That is to say, if the current carbon load satisfies the condition that "the current carbon load is greater than or equal to the second carbon load threshold", the power generation mode of the range extender is selected as the fixed-point power generation mode.

[0076] For example, the first carbon load threshold can be set to set carbon load 1, and the second carbon load threshold can be set to set carbon load 2 or set carbon load 3; the current carbon load is compared with the set carbon load 1, and if the current carbon load is less than or equal to the set carbon load 1 (1.5 g / L), the current power generation mode is maintained;

[0077] If the current carbon loading is greater than the set carbon loading 1, compare the current carbon loading with the set carbon loading 2 (set carbon loading 1 + 0.2 g / L) or the set carbon loading 3 (2.0 g / L);

[0078] If the current carbon load is less than the set carbon load 2 or the set carbon load 3, the current power generation mode is maintained;

[0079] Among them, if the current carbon load is compared with the set carbon load 2, then when the current carbon load is less than the set carbon load 2, the current power generation mode is maintained; if the current carbon load is compared with the set carbon load 3, then when the current carbon load is less than the set carbon load 3, the current power generation mode is maintained;

[0080] If the current carbon load is greater than or equal to the set carbon load 2 or greater than or equal to the set carbon load 3, select the fixed-point power generation mode.

[0081] Step S103: When the range extender uses the fixed-point power generation mode, the current SOC and operating point parameters are used to calculate the unit carbon consumption corresponding to the alternative power generation operating point.

[0082] In the specific implementation of step S103, when the range extender enables the fixed-point power generation mode (that is, the range extender selects the fixed-point power generation mode), the current SOC and the operating point parameters corresponding to the alternative power generation operating points are used to calculate the unit carbon consumption corresponding to each alternative power generation operating point.

[0083] Step S104: selecting a fixed power generation operating point from a plurality of candidate power generation operating points according to the unit carbon removal amount and fuel consumption.

[0084] In the specific implementation of step S104, after calculating the unit carbon consumption corresponding to each alternative power generation operating point, the average power demand of the vehicle within the specified time is calculated, for example, the average power demand of the vehicle in the first 10 seconds is calculated to obtain the average power demand of the vehicle;

[0085] According to the order of the fuel consumption per unit carbon removal corresponding to each alternative power generation operating point from low to high, the alternative power generation operating point that meets the average power demand of the whole vehicle and has the lowest fuel consumption per unit carbon removal is selected as the fixed power generation operating point.

[0086] In other words, the fixed power generation operating point is: among all the alternative power generation operating points, the alternative power generation operating point that meets the average power demand of the whole vehicle and has the lowest fuel consumption per unit carbon consumption.

[0087] In other words, the fixed power generation operating point is: the alternative power generation operating point with the lowest fuel consumption per unit carbon consumption among the alternative power generation operating points that meet the average power demand of the whole vehicle.

[0088] In practical applications, the alternative power generation operating point with the lowest fuel consumption per unit of carbon removal is preferentially selected as the fixed-point power generation operating point. If the alternative power generation operating point currently selected as the "fixed-point power generation operating point" does not meet the average power demand of the whole vehicle calculated above, the alternative power generation operating points are selected in sequence from low to high in terms of fuel consumption per unit of carbon removal until an alternative power generation operating point that meets the average power demand of the whole vehicle is selected. At this time, the alternative power generation operating point selected is used as the fixed-point power generation operating point.

[0089] Step S105: Control the range extender to operate at a fixed power generation operating point to control the carbon deposits of the DPF within a specified range.

[0090] In the specific implementation of step S105, after the fixed-point power generation operating point is selected, the motor and the engine of the range extender are controlled to maintain operation at the fixed-point power generation operating point, so as to control the carbon deposits of the DPF within a specified range.

[0091] In an embodiment of the present invention, whether to enable the fixed-point power generation mode is determined by the current carbon load; when the fixed-point power generation mode is enabled, the operating point parameters corresponding to the alternative power generation operating point are used to select the fixed-point power generation operating point, and the range extender is controlled to operate at the fixed-point power generation operating point to control the carbon deposits of the DPF within a specified range, avoid frequent active regeneration and driving regeneration, reduce the vehicle use cost and take into account the vehicle power.

[0092] For the above-mentioned embodiments of the present invention Figure 1 The calculation of the unit carbon consumption corresponding to the alternative power generation operating point involved in step S103 is as follows: Figure 2 , shows a flow chart of calculating unit carbon removal fuel consumption provided by an embodiment of the present invention, including the following steps:

[0093] Step S201: When the range extender uses the fixed-point power generation mode, the target power generation is calculated using the current SOC, the preset target SOC and the total power of the vehicle's power battery.

[0094] In the specific implementation of step S201, when the range extender enables the fixed-point power generation mode (that is, the range extender selects the fixed-point power generation mode), the target power generation is calculated based on the current SOC (for example, 50%), the target SOC (for example, 80%), and the total power of the power battery.

[0095] Step S202: Calculate the shortest operating time corresponding to the alternative power generation operating point based on the target power generation and the power generation efficiency, speed and torque corresponding to the alternative power generation operating point.

[0096] In the specific implementation of step S202, the calculated target power generation is used in combination with the power generation efficiency, speed and torque corresponding to the alternative power generation operating point to calculate the shortest operating time corresponding to the alternative power generation operating point.

[0097] Specifically, the shortest operating time is calculated by the following formula: The shortest operating time corresponding to the alternative power generation operating point = target power generation / power generation efficiency corresponding to the alternative power generation operating point*9550 / (speed corresponding to the alternative power generation operating point*torque corresponding to the alternative power generation operating point).

[0098] Step S203: Calculate the carbon removal amount corresponding to the alternative power generation operating point by using the shortest operating time and carbon removal rate corresponding to the alternative power generation operating point.

[0099] In the specific implementation of step S203, the carbon removal amount corresponding to the alternative power generation operating point is calculated based on the shortest operating time and carbon removal rate corresponding to the alternative power generation operating point.

[0100] Specifically, the carbon elimination amount corresponding to the alternative power generation operating point is calculated by the following formula: Carbon elimination amount = shortest operating time corresponding to the alternative power generation operating point * carbon elimination rate corresponding to the alternative power generation operating point.

[0101] Step S204: Calculate the fuel consumption per unit carbon removal amount corresponding to the alternative power generation operating point according to the target power generation amount, combined with the carbon removal amount, power generation efficiency and engine fuel consumption rate corresponding to the alternative power generation operating point.

[0102] In the specific implementation of step S204, the target power generation is used, combined with the carbon removal amount, power generation efficiency and engine fuel consumption rate corresponding to the alternative power generation operating point, to calculate the unit carbon removal fuel consumption corresponding to the alternative power generation operating point.

[0103] Specifically, the fuel consumption per unit of carbon removal corresponding to the alternative power generation operating point is calculated by the following formula: Fuel consumption per unit of carbon removal = target power generation / power generation efficiency*engine fuel consumption rate / carbon removal.

[0104] Through the contents of the above steps S201 to S204, the unit carbon removal fuel consumption corresponding to each alternative power generation operating point is calculated respectively.

[0105] above Figure 2 It is the relevant instructions for calculating the fuel consumption per unit carbon elimination corresponding to the alternative power generation operating points.

[0106] To further facilitate the understanding of this scheme, the following Figure 3 Another flow chart of a carbon deposition control method is shown as an example. Figure 3 In the calculation, the first carbon loading threshold is the set carbon loading 1 (1.5 g / L), the second carbon loading threshold is the set carbon loading 2 (set carbon loading 1 + 0.2 g / L) or the set carbon loading 3 (2.0 g / L). Figure 3 The following steps are involved:

[0107] Step S301: determine whether the current carbon load of the DPF is less than or equal to the set carbon load 1; if it is less than or equal to the set carbon load 1, execute step S302; if it is greater than the set carbon load 1, execute step S303.

[0108] Step S302: Maintain the current power generation mode.

[0109] Step S303: determine whether the current carbon loading is greater than or equal to the set carbon loading 2 or the set carbon loading 3; if it is greater than or equal to the set carbon loading 2 or the set carbon loading 3, execute step S304; if it is less than the set carbon loading 2 or the set carbon loading 3, execute step S302.

[0110] Step S304: Selecting a fixed-point power generation mode.

[0111] Step S305: Calculate the fuel consumption per unit carbon removal corresponding to the alternative power generation operating point.

[0112] Step S306: Based on the unit carbon removal fuel consumption, a fixed-point power generation operating point is selected from a plurality of candidate power generation operating points.

[0113] Step S307: Control the motor and the engine of the range extender to maintain operation at a fixed power generation operating point, thereby controlling the carbon deposits of the DPF within a specified range.

[0114] It should be noted that Figure 3 For the execution principle of each step in the embodiment of the present invention, please refer to the above embodiment of the present invention. Figure 1 and Figure 2 The contents in will not be repeated here.

[0115] In combination with the above embodiments of the present invention Figures 1 to 3 From the content, this scheme comprehensively considers factors such as the post-treatment passive regeneration rate, power generation efficiency, fuel economy and the average power demand of the whole vehicle, and makes full use of the passive regeneration function of the engine post-treatment to control the carbon deposits of DPF within the specified range, effectively avoiding frequent active regeneration and driving regeneration, which can reduce the vehicle use cost throughout the life cycle, and also take into account the power performance of the whole vehicle.

[0116] Corresponding to the carbon deposition control method provided by the above embodiment of the present invention, see Figure 4 , the embodiment of the present invention also provides a structural block diagram of a carbon deposition control system, the carbon deposition control system includes: an acquisition unit 100, a first control unit 200, a calculation unit 300, a selection unit 400 and a second control unit 500;

[0117] The acquisition unit 100 is used to obtain the current carbon load of the DPF, the current SOC and the operating point parameters corresponding to multiple alternative power generation operating points when the vehicle's range extender is running. The operating point parameters include at least power generation efficiency, carbon removal rate, speed, torque and engine fuel consumption rate.

[0118] In some embodiments, the alternative power generation operating point is an operating point where the load is higher than a load threshold, the after-treatment exhaust temperature is higher than a temperature threshold, and the engine fuel consumption rate is lower than a fuel consumption rate threshold.

[0119] The first control unit 200 is used to control the range extender to maintain the currently enabled power generation mode based on the current carbon load, or to control the range extender to enable the fixed-point power generation mode.

[0120] The calculation unit 300 is used to calculate the unit carbon reduction fuel consumption corresponding to the alternative power generation operating point using the current SOC and operating point parameters when the range extender uses the fixed-point power generation mode.

[0121] The selection unit 400 is used to select a fixed-point power generation operating point from a plurality of candidate power generation operating points according to the unit carbon removal amount and fuel consumption.

[0122] In a specific implementation, the selection unit 400 is specifically used to: calculate the average power demand of the vehicle within a specified time period; and select, in order of fuel consumption per unit carbon consumption from low to high, an alternative power generation operating point that meets the average power demand of the vehicle and has the lowest fuel consumption per unit carbon consumption as the fixed-point power generation operating point.

[0123] The second control unit 500 is used to control the range extender to operate at a fixed power generation operating point to control the carbon deposits of the DPF within a specified range.

[0124] In an embodiment of the present invention, whether to enable the fixed-point power generation mode is determined by the current carbon load; when the fixed-point power generation mode is enabled, the operating point parameters corresponding to the alternative power generation operating point are used to select the fixed-point power generation operating point, and the range extender is controlled to operate at the fixed-point power generation operating point to control the carbon deposits of the DPF within a specified range, avoid frequent active regeneration and driving regeneration, reduce the vehicle use cost and take into account the vehicle power.

[0125] Preferably, combined Figure 4 As shown in the figure, the first control unit 200 includes a first judgment module, a first control module, a second judgment module and a second control module. The execution principle of each module is as follows:

[0126] The first judgment module is used to judge whether the current carbon loading is less than or equal to a first carbon loading threshold.

[0127] The first control module is used to control the range extender to maintain the currently enabled power generation mode if the current carbon load is less than or equal to a first carbon load threshold.

[0128] The second judgment module is used to judge whether the current carbon loading is greater than or equal to a second carbon loading threshold if the current carbon loading is greater than the first carbon loading threshold.

[0129] The second control module is used to control the range extender to maintain the currently enabled power generation mode if the current carbon load is less than the second carbon load threshold; if the current carbon load threshold is greater than or equal to the second carbon load threshold, control the range extender to enable the fixed-point power generation mode.

[0130] Preferably, combined Figure 4 The content shown, the calculation unit 300 includes a first calculation module, a second calculation module, a third calculation module and a fourth calculation module, and the execution principle of each module is as follows:

[0131] The first calculation module is used to calculate the target power generation by using the current SOC, the preset target SOC and the total power of the vehicle's power battery when the range extender enables the fixed-point power generation mode.

[0132] The second calculation module is used to calculate the shortest operating time corresponding to the alternative power generation operating point according to the target power generation and the power generation efficiency, speed and torque corresponding to the alternative power generation operating point.

[0133] The third calculation module is used to calculate the carbon removal amount corresponding to the alternative power generation operating point by using the shortest operating time and carbon removal rate corresponding to the alternative power generation operating point.

[0134] The fourth calculation module is used to calculate the fuel consumption per unit carbon removal corresponding to the alternative power generation operating point based on the target power generation, combined with the carbon removal amount, power generation efficiency and engine fuel consumption rate corresponding to the alternative power generation operating point.

[0135] In summary, the embodiments of the present invention provide a carbon deposit control method and system, which determines whether to enable the fixed-point power generation mode according to the current carbon load; when the fixed-point power generation mode is enabled, the operating point parameters corresponding to the alternative power generation operating point are used to select the fixed-point power generation operating point, and the range extender is controlled to operate at the fixed-point power generation operating point to control the carbon deposits of the DPF within a specified range, avoid frequent active regeneration and driving regeneration, reduce the vehicle use cost and take into account the vehicle power.

[0136] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0137] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0138] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A carbon deposition control method, characterized in that: The method comprises: When the range extender of the vehicle is running, obtaining the current carbon load of the diesel particulate filter DPF, the current SOC and operating point parameters corresponding to multiple alternative power generation operating points, wherein the operating point parameters at least include power generation efficiency, carbon removal rate, speed, torque and engine fuel consumption rate; Based on the current carbon load, controlling the range extender to maintain the currently enabled power generation mode, or controlling the range extender to enable a fixed-point power generation mode; When the range extender enables the fixed-point power generation mode, the current SOC and the operating point parameters are used to calculate the unit carbon removal fuel consumption corresponding to the alternative power generation operating point, including: when the range extender enables the fixed-point power generation mode, the target power generation is calculated using the current SOC, the preset target SOC and the total power of the vehicle's power battery; according to the target power generation, combined with the power generation efficiency, speed and torque corresponding to the alternative power generation operating point, the shortest operating time corresponding to the alternative power generation operating point is calculated; the carbon removal corresponding to the alternative power generation operating point is calculated using the shortest operating time and carbon removal rate corresponding to the alternative power generation operating point; according to the target power generation, combined with the carbon removal, power generation efficiency and engine fuel consumption rate corresponding to the alternative power generation operating point, the unit carbon removal fuel consumption corresponding to the alternative power generation operating point is calculated; the alternative power generation operating point is: a load higher than a load threshold, a post-processing exhaust temperature higher than a temperature threshold, and an engine fuel consumption rate lower than a fuel consumption rate threshold; According to the unit carbon removal amount fuel consumption, selecting a fixed-point power generation operating point from the plurality of the candidate power generation operating points includes: calculating the average power demand of the vehicle within a specified time period; selecting the candidate power generation operating point that meets the average power demand of the vehicle and has the lowest unit carbon removal amount fuel consumption as the fixed-point power generation operating point according to the unit carbon removal amount fuel consumption from low to high; The range extender is controlled to operate at the fixed-point power generation operating point to control the carbon deposit of the DPF within a specified range.

2. The method according to claim 1, characterized in that Based on the current carbon load, controlling the range extender to maintain the currently enabled power generation mode, or controlling the range extender to enable a fixed-point power generation mode, includes: Determining whether the current carbon load is less than or equal to a first carbon load threshold; If the current carbon load is less than or equal to the first carbon load threshold, controlling the range extender to maintain the currently enabled power generation mode; If the current carbon loading is greater than the first carbon loading threshold, determining whether the current carbon loading is greater than or equal to a second carbon loading threshold; If the current carbon load is less than the second carbon load threshold, controlling the range extender to maintain the currently enabled power generation mode; If the current carbon load threshold is greater than or equal to the second carbon load threshold, the range extender is controlled to enable fixed-point power generation mode.

3. A carbon deposition control system, characterized in that: The system comprises: An acquisition unit, used to acquire the current carbon load of the diesel particulate filter DPF, the current SOC and operating point parameters corresponding to a plurality of alternative power generation operating points when the range extender of the vehicle is running, wherein the operating point parameters at least include power generation efficiency, carbon removal rate, speed, torque and engine fuel consumption rate; A first control unit is used to control the range extender to maintain a currently enabled power generation mode based on the current carbon load, or to control the range extender to enable a fixed-point power generation mode; a calculation unit, configured to calculate, when the range extender enables the fixed-point power generation mode, the unit carbon removal fuel consumption corresponding to the alternative power generation operating point by using the current SOC and the operating point parameter; the alternative power generation operating point is an operating point where the load is higher than a load threshold, the after-treatment exhaust temperature is higher than a temperature threshold, and the engine fuel consumption rate is lower than a fuel consumption rate threshold; The calculation unit includes: a first calculation module, a second calculation module, a third calculation module and a fourth calculation module; The first calculation module is used to calculate the target power generation by using the current SOC, the preset target SOC and the total power of the power battery of the vehicle when the range extender enables the fixed-point power generation mode; The second calculation module is used to calculate the shortest operating time corresponding to the alternative power generation operating point according to the target power generation and the power generation efficiency, speed and torque corresponding to the alternative power generation operating point; The third calculation module is used to calculate the carbon removal amount corresponding to the alternative power generation operating point by using the shortest operating time and carbon removal rate corresponding to the alternative power generation operating point; The fourth calculation module is used to calculate the fuel consumption per unit carbon removal amount corresponding to the alternative power generation operating point according to the target power generation amount, combined with the carbon removal amount, power generation efficiency and engine fuel consumption rate corresponding to the alternative power generation operating point; A selection unit, configured to select a fixed-point power generation operating point from a plurality of the candidate power generation operating points according to the unit carbon removal amount fuel consumption; The selection unit is specifically used to: calculate the average power demand of the vehicle within a specified time; select the alternative power generation operating point that meets the average power demand of the vehicle and has the lowest unit carbon removal fuel consumption as the fixed-point power generation operating point according to the order of the unit carbon removal fuel consumption from low to high; The second control unit is used to control the range extender to operate at the fixed-point power generation operating point to control the carbon deposit of the DPF within a specified range.

4. The system according to claim 3, characterized in that The first control unit comprises: A first judgment module, used to judge whether the current carbon loading is less than or equal to a first carbon loading threshold; A first control module, configured to control the range extender to maintain a currently enabled power generation mode if the current carbon load is less than or equal to the first carbon load threshold; a second judgment module, configured to judge whether the current carbon loading is greater than or equal to a second carbon loading threshold if the current carbon loading is greater than the first carbon loading threshold; The second control module is used to control the range extender to maintain the currently enabled power generation mode if the current carbon load is less than the second carbon load threshold; if the current carbon load threshold is greater than or equal to the second carbon load threshold, control the range extender to enable the fixed-point power generation mode.

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