Electric heating tail gas control method and system for extended-range automobile

Abstract

The invention discloses an extended-range automobile electric heating tail gas control method and system. The extended-range automobile electric heating tail gas control method comprises the following steps that a battery capacity interval and the residual capacity of an automobile battery are obtained; determining a corresponding battery capacity interval based on the residual capacity of the automobile battery; based on the corresponding battery capacity interval, the engine state, the first temperature t1 and / or the current required power of the whole vehicle and / or the vehicle speed are / is obtained; according to the corresponding battery capacity interval, whether an electric heater is turned on or not is judged based on the engine state, the first temperature t1 of tail gas exhausted by the three-way catalyst and / or the current required power of the whole vehicle and / or the vehicle speed; and according to the corresponding battery capacity interval, the second temperature t2 of the tail gas discharged by the three-way catalyst and / or the average required power of the whole vehicle are / is obtained, and whether the electric heater is turned off or not is judged. The conversion efficiency of the three-way catalytic converter can be improved, the effect of reducing the emission threshold value is achieved, energy consumption is reduced, and the stroke of the hybrid electric vehicle is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive exhaust gas treatment, and more specifically, to a method and system for controlling the electrically heated exhaust gas of a range-extended electric vehicle. Background Art

[0002] With the policy guidance and market selection, hybrid vehicles have become an inevitable route to replace fuel vehicles. As the main development mode of future passenger vehicles, compared with traditional gasoline vehicles, the operating conditions of the engines of hybrid vehicles are more complex. With the assistance of electric motors for driving, during the operation of hybrid vehicles, the engines are allowed to start and stop frequently, which will cause a sharp increase in the emissions of transient pollutants, including gaseous and solid pollutants.

[0003] The three-way catalytic converter only has a high conversion efficiency when the exhaust gas temperature reaches 250 - 400 °C. In the cold start stage, the temperature of the catalyst in the exhaust gas after-treatment system is still very low, and the conversion efficiency for gaseous pollutants is less than 50%. If the exhaust gas flow rate is large, a large amount of waste gas pollutants will be discharged into the air without being converted. According to statistics, 70% of the HC exhaust gas emissions of passenger vehicles come from the cold start stage of the vehicle, and for hybrid vehicles, due to frequent start and stop, the emission problem in the cold start stage is more serious.

[0004] Therefore, how to provide a method and system for controlling the electrically heated exhaust gas of a range-extended electric vehicle that can solve the exhaust gas emission problem has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] An object of the present invention is to provide a new technical solution for a method and system for controlling the electrically heated exhaust gas of a range-extended electric vehicle.

[0006] According to a first aspect of the present invention, there is provided a method for controlling the electrically heated exhaust gas of a range-extended electric vehicle, including the following steps:

[0007] Step S1, obtaining the battery capacity range and the remaining capacity of the vehicle battery;

[0008] Step S2, determining the corresponding battery capacity range based on the remaining capacity of the vehicle battery;

[0009] Step S3, obtaining the engine state, the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter, and / or the current demand power of the whole vehicle, and / or the vehicle speed based on the corresponding battery capacity range;

[0010] Step S4, judging whether to turn on the electric heater according to the corresponding battery capacity range, based on the engine state and the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter, and / or the current demand power of the whole vehicle, and / or the vehicle speed;

[0011] Step S5: According to the corresponding battery capacity range, obtain the second temperature t2 of the exhaust gas emitted by the three-way catalytic converter and / or the average demand power of the whole vehicle. Based on the second temperature t2 of the exhaust gas emitted by the three-way catalytic converter and / or the average demand power of the whole vehicle, determine whether to turn off the electric heater.

[0012] Optionally, the battery capacity ranges include battery capacity ≥ 50%, battery capacity 30% - 50%, battery capacity 20% - 30%, and battery capacity < 20%.

[0013] Optionally, when the remaining capacity of the vehicle battery ≥ 50%, control the electric heater to remain in the off state.

[0014] Optionally, when the remaining capacity of the vehicle battery is in the range of 30% - 50%, step S3 includes the following steps:

[0015] Step S311: Obtain the engine status. If the engine is not started, execute step S312;

[0016] Step S312: Obtain the first temperature t1 of the exhaust gas emitted by the three-way catalytic converter;

[0017] Step S313: Based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100°C. If so, execute step S314;

[0018] Step S314: Obtain the current demand power of the whole vehicle and the current maximum discharge power of the battery;

[0019] Step S315: Based on the current demand power of the whole vehicle, determine whether the current demand power of the whole vehicle is greater than or equal to the current maximum discharge power of the battery within 1 s. If so, execute step S316;

[0020] Step S316: Obtain the first average demand power of the whole vehicle in the previous 10 s;

[0021] Step S317: Based on the first average demand power of the whole vehicle in 10 s, determine whether the first average demand power of the whole vehicle in the previous 10 s is greater than or equal to 30 kw. If so, control the electric heater to turn on.

[0022] Optionally, when the remaining capacity of the vehicle battery is in the range of 20% - 30%, step S3 includes the following steps:

[0023] Step S321: Obtain the engine status. If the engine is not started, execute step S322;

[0024] Step S322: Obtain the first temperature t1 of the exhaust gas emitted by the three-way catalytic converter;

[0025] Step S323: Based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100°C. If so, execute Step S324;

[0026] Step S324: Obtain the vehicle speed;

[0027] Step S325: Based on the vehicle speed, determine whether the vehicle speed is greater than or equal to 1 km / h. If so, execute Step S326;

[0028] Step S326: Obtain the average required power of the whole vehicle within 10 s;

[0029] Step S327: Based on the average required power of the whole vehicle within 10 s, determine whether the average required power of the whole vehicle within 10 s is greater than or equal to 4 kw. If so, control the electric heater to turn on.

[0030] Optionally, in Step S311 and Step S321, if the engine starts, it includes the following steps:

[0031] Step S331: Obtain the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter;

[0032] Step S332: Based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100°C. If so, control the electric heater to turn on.

[0033] Optionally, when the remaining capacity of the vehicle battery < 20%, Step S3 includes the following steps:

[0034] Step S341: Obtain the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter;

[0035] Step S342: Based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100°C. If so, control the range extender and the electric heater to turn on;

[0036] Step S343: Obtain the first rotational speed of the engine;

[0037] Step S344: Based on the first rotational speed of the engine, control the duty ratio of the electric heater.

[0038] Optionally, Step S5 includes the following steps:

[0039] Step S511: When the remaining capacity of the vehicle battery is less than or equal to 30%, obtain the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter;

[0040] Step S511: Based on the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter, determine whether the second temperature t2 is greater than or equal to 200°C. If so, control the electric heater to turn off;

[0041] And,

[0042] Step S521: When the remaining capacity of the vehicle battery is less than or equal to 30% - 50%, obtain the second temperature t2 of the exhaust gas emitted by the three-way catalytic converter.

[0043] Step S522: Based on the second temperature t2 of the exhaust gas emitted by the three-way catalytic converter, determine whether the second temperature t2 is greater than or equal to 200 °C. If so, execute Step S523.

[0044] Step S523: Obtain the second average demand power of the whole vehicle in the previous 10 s.

[0045] Step S524: Based on the average demand power of the whole vehicle, determine whether the second average demand power of the whole vehicle in the previous 10 s is less than or equal to 25 kw. If so, control the electric heater to turn off.

[0046] Optionally, before Step S1, the following steps are further included:

[0047] Step S001: Obtain the vehicle operation mode, where the vehicle operation mode includes pure electric mode and hybrid mode.

[0048] Step S002: When the vehicle operation mode is hybrid mode, execute Step S1; when the vehicle operation mode is pure electric mode, obtain the third temperature t3 of the exhaust gas emitted by the three-way catalytic converter.

[0049] Step S003: Based on the third temperature t3, determine whether the third temperature t3 is less than or equal to 100 °C. If so, control the engine to start and the electric heater to start.

[0050] Step S004: Obtain the second rotational speed of the engine.

[0051] Step S005: Based on the second rotational speed of the engine, control the duty ratio of the electric heater.

[0052] According to the second aspect of the present invention, a range-extended electric vehicle exhaust gas heating control system is provided, including a three-way catalytic converter, an electric heater, a controller, an exhaust temperature sensor, and an engine.

[0053] The three-way catalytic converter is connected to the exhaust pipe of the engine. The controller is connected to the electric heater, the exhaust temperature sensor, and the engine. The electric heater is arranged at the front end of the three-way catalytic converter and is used to heat the three-way catalytic converter. The exhaust temperature sensor is arranged at the rear end of the three-way catalytic converter.

[0054] The electric heater includes a heating plate, a support core, and electrodes. The heating plate is sleeved on the support core. The electrodes are arranged on the outer peripheral wall of the heating plate and are used to connect to a power source. The end of the heating plate is connected to the three-way catalytic converter.

[0055] The beneficial effects of the present invention are as follows:

[0056] In the present invention, first, the battery capacity range and the remaining capacity of the vehicle battery are obtained, and based on the remaining capacity of the vehicle battery, the corresponding battery capacity range is determined. Then, based on the corresponding battery capacity range, the engine state, the first temperature t1 of the exhaust gas emitted by the three-way catalytic converter, and / or the current demand power of the whole vehicle, and / or the vehicle speed are obtained, and it is determined whether to turn on the electric heater. Then, according to the corresponding battery capacity range, the second temperature t2 of the exhaust gas emitted by the three-way catalytic converter and / or the average demand power of the whole vehicle are obtained, and it is determined whether to turn off the electric heater. By preheating the three-way catalytic converter before the engine starts and synchronously heating the three-way catalytic converter during the engine startup process, the present invention can improve the conversion efficiency of the three-way catalytic converter, achieve the effect of reducing the emission threshold, and also reduce energy consumption and increase the driving range of the hybrid vehicle.

[0057] Other features and advantages of the present invention will become clear from the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings. Description of the Drawings

[0058] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention.

[0059] Figure 1 It is a flowchart of the electric heating exhaust gas control method for a range-extended electric vehicle of the present invention;

[0060] Figure 2 It is a flowchart of the electric heating exhaust gas control method for a range-extended electric vehicle of the present invention when the remaining capacity of the vehicle battery is between 30% and 50%;

[0061] Figure 3 It is a flowchart of the electric heating exhaust gas control method for a range-extended electric vehicle of the present invention when the remaining capacity of the vehicle battery is between 20% and 30%;

[0062] Figure 4 It is a flowchart of the electric heating exhaust gas control method for a range-extended electric vehicle of the present invention when the engine starts;

[0063] Figure 5 It is a flowchart of the electric heating exhaust gas control method for a range-extended electric vehicle of the present invention when the remaining capacity of the vehicle battery is less than 20%;

[0064] Figure 6 Flow chart of the first embodiment for controlling the electric heater to turn off in the electric heating exhaust gas control method of the range extender vehicle of the present invention;

[0065] Figure 7 Flow chart of the second embodiment for controlling the electric heater to turn off in the electric heating exhaust gas control method of the range extender vehicle of the present invention;

[0066] Figure 8 Flow chart of the electric heating exhaust gas control method of the range extender vehicle of the present invention before step S1;

[0067] Figure 9 Specific flow chart of the first embodiment of the electric heating exhaust gas control method of the range extender vehicle of the present invention;

[0068] Figure 10 Specific flow chart of the second embodiment of the electric heating exhaust gas control method of the range extender vehicle of the present invention;

[0069] Figure 11 Structure diagram of the electric heating exhaust gas control system of the range extender vehicle of the present invention;

[0070] Figure 12 Structure diagram of the three-way catalytic converter of the present invention;

[0071] Figure 13 Structure diagram of the electric heater of the present invention.

[0072] The labels in the figure are as follows: 1, three-way catalytic converter; 2, electric heater; 21, heating plate; 22, support core; 23, electrode; 3, engine. Detailed implementation manners

[0073] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0074] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation to the present invention or its application or use.

[0075] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0076] In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0077] As Figures 1 to 10As shown in the figure, an embodiment of the present invention provides a method for controlling the electrically heated exhaust gas of an extended-range vehicle, including the following steps:

[0078] Step S1: Obtain the battery capacity range and the remaining capacity of the vehicle battery;

[0079] Step S2: Based on the remaining capacity of the vehicle battery, determine the corresponding battery capacity range;

[0080] Step S3: Based on the corresponding battery capacity range, obtain the engine state, the first temperature t1 of the exhaust gas discharged from the three-way catalyst, and / or the current demand power of the whole vehicle, and / or the vehicle speed;

[0081] Step S4: According to the corresponding battery capacity range, based on the engine state and the first temperature t1 of the exhaust gas discharged from the three-way catalyst, and / or the current demand power of the whole vehicle, and / or the vehicle speed, determine whether to turn on the electric heater;

[0082] Step S5: According to the corresponding battery capacity range, obtain the second temperature t2 of the exhaust gas discharged from the three-way catalyst and / or the average demand power of the whole vehicle, and based on the second temperature t2 of the exhaust gas discharged from the three-way catalyst and / or the average demand power of the whole vehicle, determine whether to turn off the electric heater.

[0083] The present invention first obtains the battery capacity range and the remaining capacity of the vehicle battery, and based on the remaining capacity of the vehicle battery, determines the corresponding battery capacity range; then, based on the corresponding battery capacity range, obtains the engine state, the first temperature t1 of the exhaust gas discharged from the three-way catalyst, and / or the current demand power of the whole vehicle, and / or the vehicle speed, and determines whether to turn on the electric heater; then, according to the corresponding battery capacity range, obtains the second temperature t2 of the exhaust gas discharged from the three-way catalyst and / or the average demand power of the whole vehicle, and determines whether to turn off the electric heater. By preheating the three-way catalyst before the engine starts and synchronously heating the three-way catalyst during the engine startup process, the present invention can improve the conversion efficiency of the three-way catalyst, achieve the effect of reducing the emission threshold, and also reduce energy consumption and increase the driving range of the hybrid vehicle.

[0084] Specifically, the battery capacity range includes battery capacity ≥ 50%, battery capacity of 30% - 50%, battery capacity of 20% - 30%, and battery capacity < 20%.

[0085] In an embodiment of the method for controlling the electrically heated exhaust gas of the extended-range vehicle of the present invention, as Figure 9 and Figure 10 shown, when the remaining capacity of the vehicle battery ≥ 50%, the electric heater is controlled to remain in the off state.

[0086] Specifically, when the remaining capacity of the vehicle battery ≥ 50%, the hybrid vehicle is driven only by the electric motor, and the battery provides energy. At this time, the engine does not work, so no exhaust gas is generated and there is no need to treat the exhaust gas.

[0087] In an embodiment of the extended-range vehicle electric heating exhaust gas control method of the present invention, as Figure 2 shown, when the remaining capacity of the vehicle battery is between 30% - 50%, step S3 includes the following steps:

[0088] Step S311, obtain the engine state. If the engine is not started, then execute step S312;

[0089] Step S312, obtain the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter;

[0090] Step S313, based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100 °C. If so, then execute step S314;

[0091] Step S314, obtain the current demand power of the whole vehicle and the current maximum discharge power of the battery;

[0092] Step S315, based on the current demand power of the whole vehicle, determine whether the current demand power of the whole vehicle is greater than or equal to the current maximum discharge power of the battery within 1 s. If so, then execute step S316; Specifically, when the current demand power of the whole vehicle is less than the current maximum discharge power of the battery within 1 s, control the electric heater to remain in the off state.

[0093] Step S316, obtain the first average demand power of the whole vehicle in the previous 10 s;

[0094] Step S317, based on the first average demand power of the whole vehicle in 10 s, determine whether the first average demand power of the whole vehicle in the previous 10 s is greater than or equal to 30 kw. If so, then control the electric heater to turn on.

[0095] Specifically, when the first average demand power of the whole vehicle in the previous 10 s is less than 30 kw, control the electric heater to remain in the off state.

[0096] It should be noted that the power of the engine directly affects its combustion efficiency, and thus affects exhaust gas emissions. Specifically, an increase in the engine power demand usually requires burning more fuel, and an increase in the fuel combustion amount directly leads to an increase in the emissions of pollutants (such as CO2, NO x , particulate matter, etc.) in the exhaust gas. Especially in the case of rapid acceleration or high-load working conditions, the engine is in a rich combustion state, and the phenomenon of incomplete combustion is aggravated, further deteriorating the emissions.

[0097] In this embodiment, when the current demand power of the whole vehicle is greater than or equal to the current maximum discharge power of the battery within 1 second, that is, the demand power of the whole vehicle is relatively high at this time, the emissions of pollutants in the exhaust gas increase. Therefore, an electric heater is required to heat the three-way catalytic converter, thereby improving the conversion efficiency of the three-way catalytic converter and achieving the effect of reducing the emission threshold.

[0098] In an embodiment of the electric heating exhaust gas control method for a range-extended electric vehicle of the present invention, as Figure 3 shown, when the remaining capacity of the vehicle battery is between 20% and 30%, step S3 includes the following steps:

[0099] Step S321: Obtain the engine status. If the engine is not started, then execute step S322;

[0100] Step S322: Obtain the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter;

[0101] Step S323: Based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100 °C. If so, then execute step S324; Specifically, if the first temperature t1 is greater than 100 °C, then control the electric heater to remain in the off state.

[0102] Step S324: Obtain the vehicle speed;

[0103] Step S325: Based on the vehicle speed, determine whether the vehicle speed is greater than or equal to 1 km / h. If so, then execute step S326; Specifically, if the vehicle speed is less than 1 km / h, then control the electric heater to remain in the off state. When the vehicle speed is less than 1 km / h, it indicates that the vehicle is in a stopped state or a slow driving state, so the engine does not need to intervene, and therefore the vehicle has no exhaust emissions.

[0104] Step S326: Obtain the average demand power of the whole vehicle within 10 s;

[0105] Step S327: Based on the average demand power of the whole vehicle within 10 s, determine whether the average demand power of the whole vehicle within 10 s is greater than or equal to 4 kw. If so, then control the electric heater to turn on.

[0106] Specifically, if the average demand power of the whole vehicle within 10 s is less than or equal to 4 kw, then control the electric heater to remain in the off state.

[0107] When the remaining capacity of the vehicle battery is between 20% and 30%, due to the low remaining capacity of the battery and the high requirement for the average demand power of the whole vehicle within 10 s, therefore, at this time, the engine needs to intervene, and the emissions also increase accordingly. An electric heater is required to heat the three-way catalytic converter, thereby improving the conversion efficiency of the three-way catalytic converter and achieving the effect of reducing the emission threshold.

[0108] In an embodiment of the electric heating exhaust gas control method for a range-extended electric vehicle of the present invention, as Figure 4 shown, in steps S311 and S321, if the engine is started, the following steps are included:

[0109] Step S331: Obtain the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter;

[0110] Step S332: Based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100 °C. If so, control the electric heater to turn on.

[0111] Specifically, if the first temperature t1 is greater than 100 °C, control the electric heater to remain in the off state.

[0112] When the engine is started and the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter is less than or equal to 100 °C, it indicates that the temperature of the exhaust gas discharged from the three-way catalytic converter is relatively low, and the electric heater is required to heat the three-way catalytic converter to improve the conversion efficiency of the three-way catalytic converter for the exhaust gas.

[0113] In an embodiment of the electric heating exhaust gas control method for a range-extended electric vehicle of the present invention, as Figure 5 shown, when the remaining capacity of the vehicle battery < 20%, step S3 includes the following steps:

[0114] Step S341: Obtain the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter;

[0115] Step S342: Based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100 °C. If so, control the range extender and the electric heater to turn on; specifically, if the first temperature t1 is greater than 100 °C, control the range extender and the electric heater to remain in the off state.

[0116] Step S343: Obtain the first rotational speed of the engine;

[0117] Step S344: Based on the first rotational speed of the engine, control the duty cycle of the electric heater.

[0118] When the range extender operates at 800 revolutions, control the electric heater to heat at the maximum power of 4 kW. At this time, control the duty cycle of the electric heater to be 100%.

[0119] In an embodiment of the electric heating exhaust gas control method for a range-extended electric vehicle of the present invention, as Figure 6 shown, step S5 includes the following steps:

[0120] Step S511: When the remaining capacity of the vehicle battery is less than or equal to 30%, obtain the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter;

[0121] Step S511: Based on the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter, determine whether the second temperature t2 is greater than or equal to 200°C. If so, control the electric heater to turn off; specifically, when the second temperature t2 is less than 200°C, control the electric heater to continue to maintain the working state.

[0122] When the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter is greater than or equal to 200°C, it indicates that the temperature meets the requirements for the three-way catalytic converter to treat the exhaust gas. At this time, turning off the electric heater can reduce energy consumption.

[0123] And,

[0124] As Figure 7 shown, step S521: When the remaining capacity of the vehicle battery is less than or equal to 30% - 50%, obtain the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter;

[0125] Step S522: Based on the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter, determine whether the second temperature t2 is greater than or equal to 200°C. If so, execute step S523; specifically, when the second temperature t2 is less than 200°C, control the electric heater to continue to maintain the working state.

[0126] Step S523: Obtain the second average demand power of the whole vehicle in the first 10s;

[0127] Step S524: Based on the average demand power of the whole vehicle, determine whether the second average demand power of the whole vehicle in the first 10s is less than or equal to 25kw. If so, control the electric heater to turn off. Specifically, when the second average demand power of the whole vehicle in the first 10s is greater than 25kw, control the electric heater to remain in the off state.

[0128] When the second average demand power of the whole vehicle in the first 10s is less than or equal to 25kw, it indicates that the demand power of the vehicle is relatively low. Therefore, at this time, the intervention of the engine is not required, and the emissions will also decrease accordingly. At this time, the electric heater can be controlled to turn off to reduce energy consumption and increase the driving range of the vehicle.

[0129] In an embodiment of the electric heating exhaust gas control method for a range-extended electric vehicle of the present invention, as Figure 8 shown, before step S1, the following steps are further included:

[0130] Step S001: Obtain the vehicle operation mode, and the vehicle operation mode includes pure electric mode and hybrid mode;

[0131] Step S002: When the vehicle operation mode is hybrid mode, execute step S1; when the vehicle operation mode is pure electric mode, obtain the third temperature t3 of the exhaust gas discharged from the three-way catalytic converter;

[0132] Step S003: Based on the third temperature t3, determine whether the third temperature t3 is less than or equal to 100°C. If so, control the engine to start and the electric heater to start; specifically, when the third temperature t3 is greater than 100°C, control the electric heater to continue to maintain its working state.

[0133] Step S004: Obtain the second rotational speed of the engine.

[0134] Step S005: Based on the second rotational speed of the engine, control the duty cycle of the electric heater.

[0135] When the electric heater heats at 4 kW from 0 to 100°C, at this time, the duty cycle of the electric controller is 100%; when heating at 3 kW from 100°C to 150°C, at this time, the duty cycle of the electric controller is 75%); when heating at 2 kW from 150 to 200°C, at this time, the duty cycle of the electric controller is 50%.

[0136] According to the second aspect of the present invention, there is provided an extended-range electric vehicle electric heating exhaust gas control system, as Figures 11 to 13 shown, including a three-way catalytic converter 1, an electric heater 2, a controller, an exhaust gas temperature sensor, and an engine 3.

[0137] The three-way catalytic converter 1 is connected to the exhaust pipe of the engine 3. The controller is connected to the electric heater 2, the exhaust gas temperature sensor, and the engine 3. The electric heater 2 is arranged at the front end of the three-way catalytic converter 1. The electric heater 2 is used to heat the three-way catalytic converter 1. The exhaust gas temperature sensor is arranged at the rear end of the three-way catalytic converter 1;

[0138] The electric heater 2 includes a heating plate 21, a support core 22, and electrodes 23. The heating plate 21 is sleeved on the support core 22. The electrodes 23 are arranged on the outer peripheral wall of the heating plate 21, and the electrodes 23 are used to connect to a power source. The end of the heating plate 21 is connected to the three-way catalytic converter 1.

[0139] Specifically, the heating plate 21 and the support core 22 are made of high oxidation-resistant stainless steel. The exhaust gas temperature sensor detects the temperature of the exhaust gas discharged from the tail end of the three-way catalytic converter 1 and transmits the temperature information to the controller; the controller controls the start or shutdown of the electric heater 2 according to the temperature information transmitted by the exhaust gas temperature sensor, so as to heat the front end of the three-way catalytic converter 1 by the electric heater 2, improve the conversion efficiency of the three-way catalytic converter 1, and achieve the effect of reducing the emission threshold.

[0140] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An extended-range electric vehicle electric heating exhaust gas control method, characterized in that, It includes the following steps: Step S1, obtain the battery capacity range and the remaining capacity of the vehicle battery; Step S2, determine the corresponding battery capacity range based on the remaining capacity of the vehicle battery; Step S3, obtain the engine state, the first temperature t1, and / or the current demand power of the whole vehicle, and / or the vehicle speed based on the corresponding battery capacity range; Step S4, determine whether to turn on the electric heater according to the corresponding battery capacity range, based on the engine state and the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter, and / or the current demand power of the whole vehicle, and / or the vehicle speed; Step S5, obtain the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter and / or the average demand power of the whole vehicle according to the corresponding battery capacity range, and determine whether to turn off the electric heater based on the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter and / or the average demand power of the whole vehicle.

2. The extended-range electric vehicle electric heating exhaust gas control method according to claim 1, wherein The battery capacity ranges include battery capacity ≥ 50%, battery capacity 30% - 50%, battery capacity 20% - 30%, and battery capacity < 20%.

3. The extended-range electric vehicle electric heating exhaust gas control method according to claim 2, wherein When the remaining capacity of the vehicle battery ≥ 50%, control the electric heater to remain in the off state.

4. The extended-range electric vehicle electric heating exhaust gas control method according to claim 2, wherein When the remaining capacity of the vehicle battery is in the range of 30% - 50%, Step S3 includes the following steps: Step S311, obtain the engine state. If the engine is not started, execute Step S312; Step S312, obtain the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter; Step S313, based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100°C. If so, execute Step S314; Step S314, obtain the current demand power of the whole vehicle and the maximum current discharge power of the battery; Step S315, based on the current demand power of the whole vehicle, determine whether the current demand power of the whole vehicle is greater than or equal to the maximum current discharge power of the battery within 1 s. If so, execute Step S316; Step S316, obtain the first average demand power of the whole vehicle in the previous 10 s; Step S317, based on the first average demand power of the whole vehicle in 10 s, determine whether the first average demand power of the whole vehicle in the previous 10 s is greater than or equal to 30 kw. If so, control the electric heater to be turned on.

5. The method for electrically heating and controlling exhaust gas of a range-extended electric vehicle according to claim 4, wherein, When the remaining capacity of the vehicle battery is in the range of 20% - 30%, Step S3 includes the following steps: Step S321, obtain the engine state. If the engine is not started, execute Step S322; Step S322, obtain the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter; Step S323, based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100°C. If so, execute Step S324; Step S324, obtain the vehicle speed; Step S325, based on the vehicle speed, determine whether the vehicle speed is greater than or equal to 1 km / h. If so, execute Step S326; Step S326, obtain the average demand power of the whole vehicle within 10 s; Step S327, based on the average demand power of the whole vehicle within 10 s, determine whether the average demand power of the whole vehicle within 10 s is greater than or equal to 4 kw. If so, control the electric heater to be turned on.

6. The extended-range electric vehicle electric heating exhaust gas control method according to claim 5, wherein, In Step S311 and Step S321, if the engine is started, it includes the following steps: Step S331: Obtain the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter; Step S332: Based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100 °C. If so, control the electric heater to turn on.

7. The extended-range electric vehicle electric heating exhaust gas control method according to claim 6, characterized in that, When the remaining capacity of the vehicle battery < 20%, Step S3 includes the following steps: Step S341: Obtain the first temperature t1 of the exhaust gas discharged from the three-way catalytic converter; Step S342: Based on the first temperature t1, determine whether the first temperature t1 is less than or equal to 100 °C. If so, control the range extender and the electric heater to turn on; Step S343: Obtain the first rotational speed of the engine; Step S344: Based on the first rotational speed of the engine, control the duty ratio of the electric heater.

8. The method for electrically heating and controlling the tail gas of an extended-range electric vehicle according to claim 1, characterized in that, Step S5 includes the following steps: Step S511: When the remaining capacity of the vehicle battery is less than or equal to 30%, obtain the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter; Step S511: Based on the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter, determine whether the second temperature t2 is greater than or equal to 200 °C. If so, control the electric heater to turn off; And, Step S521: When the remaining capacity of the vehicle battery is less than or equal to 30% - 50%, obtain the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter; Step S522: Based on the second temperature t2 of the exhaust gas discharged from the three-way catalytic converter, determine whether the second temperature t2 is greater than or equal to 200 °C. If so, execute Step S523; Step S523: Obtain the second average demand power of the whole vehicle in the previous 10 s; Step S524: Based on the average demand power of the whole vehicle, determine whether the second average demand power of the whole vehicle in the previous 10 s is less than or equal to 25 kw. If so, control the electric heater to turn off.

9. The extended-range electric vehicle electric heating exhaust gas control method according to claim 1, characterized in that Before Step S1, the following steps are further included: Step S001: Obtain the vehicle operation mode, and the vehicle operation mode includes pure electric mode and hybrid mode; Step S002: When the vehicle operation mode is hybrid mode, then execute Step S1; when the vehicle operation mode is pure electric mode, obtain the third temperature t3 of the exhaust gas discharged from the three-way catalytic converter; Step S003: Based on the third temperature t3, determine whether the third temperature t3 is less than or equal to 100 °C. If so, control the engine to start and the electric heater to start; Step S004: Obtain the second rotational speed of the engine; Step S005: Based on the second rotational speed of the engine, control the duty ratio of the electric heater.

10. An extended-range electric vehicle electric heating exhaust gas control system, characterized in that, It includes a three-way catalytic converter, an electric heater, a controller, an exhaust temperature sensor, and an engine; The three-way catalytic converter is connected to the exhaust pipe of the engine, the controller is connected to the electric heater, the exhaust temperature sensor, and the engine. The electric heater is arranged at the front end of the three-way catalytic converter and is used to heat the three-way catalytic converter. The exhaust temperature sensor is arranged at the rear end of the three-way catalytic converter; The electric heater includes a heating plate, a support core, and electrodes. The heating plate is sleeved on the support core. The electrodes are arranged on the outer peripheral wall of the heating plate, and the electrodes are used to connect to a power source. The end of the heating plate is connected to the three-way catalytic converter.

Images