A method for static fuel replenishment when the battery is low in new energy vehicles

Abstract

This invention relates to the field of vehicle technology, and more specifically, to a method for static fuel-to-electricity charging of new energy vehicles with low battery levels. Due to the need for smaller openings in the front-end design of automobiles, some models rely on natural airflow for cooling of the intercooler. When charging these types of vehicles under static conditions, the method first detects the ambient temperature to obtain the actual heat dissipation capacity of the intercooler, and compares it with the static theoretical heat dissipation capacity of the intercooler to determine whether the turbocharger should intervene in fuel-to-electricity charging. Then, based on the calculated charging power of the range extender, the final engine charging speed is calculated, thereby completing the charging in the shortest time and with the highest charging efficiency, improving the user experience. In addition, to improve charging efficiency, this invention first cools the battery temperature to bring it to the optimal charging efficiency temperature value, which greatly improves charging efficiency and reduces charging time compared to existing technologies.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to a method for static fuel replenishment of a new energy vehicle when its battery is low. Background Technology

[0002] To meet the intelligent requirements of new energy vehicles, more and more low-voltage electrical devices are being installed in them. This has increased the burden on the low-voltage batteries that are responsible for power supply, causing the minimum allowable charge level of the batteries to decrease. However, the batteries bear the responsibility of supplying power to the low-voltage electrical devices of the entire vehicle and starting the range extender. Therefore, it is necessary to ensure that the power battery maintains a minimum charge level under all circumstances. As a result, for range-extended or hybrid new energy vehicles, there are situations where the battery charge is close to zero, and the range extender is recharging the battery in reverse.

[0003] In existing technologies, the battery voltage is typically detected. If the detected battery voltage is lower than a preset value, a charging request signal is generated to charge the battery. For example, Chinese invention patent (CN107244242A) discloses a charging system and method for a plug-in hybrid electric vehicle. The battery voltage is detected through detection port A. If the detected battery voltage is lower than a preset value, a charging request signal is generated and sent to the vehicle control system and the smart terminal via the CAN bus. The smart terminal receives the charging request signal sent by the power battery management system. However, the above charging process is relatively simple and considers fewer factors; therefore, it cannot be applied to vehicles of different design types.

[0004] Currently, as the design of range-extended or hybrid vehicles increasingly leans towards smaller openings at the front of the vehicle, the intercooler is positioned on either side of the turbocharger and far from the cooling fan. This means that the intercooler's external air intake relies solely on natural wind. Consequently, the intercooler's cooling capacity is limited by vehicle speed and ambient temperature. Therefore, under static conditions where the vehicle speed is zero or less than 10 km / h, the intercooler's cooling capacity is low, resulting in limited power output from the range extender. However, this issue does not exist for traditional gasoline vehicles and traditional range-extended electric vehicles. Therefore, existing charging methods cannot achieve the fastest and most efficient charging for this specific type of range-extended or hybrid vehicle.

[0005] Therefore, there is an urgent need for a technical solution to enable new energy vehicles with small front openings and intercoolers that rely on natural air intake for cooling to complete recharging in the shortest time and with the highest charging efficiency under static conditions. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the shortcomings of the above-mentioned technical solutions by providing a method for static fuel charging of new energy vehicles with low battery levels and a computer-readable storage medium, which enables new energy vehicles with small front openings and intercoolers that rely on natural air intake for cooling to complete charging in the shortest time and with the highest charging efficiency under static conditions.

[0007] To achieve the above objectives, according to one aspect of the present invention, a method for static fuel replenishment for low-battery vehicles is provided, comprising:

[0008] Obtain the current temperature T of the power battery of the new energy vehicle. 当前 And the target temperature T corresponding to the optimal charging efficiency of the power battery. 目标 ;

[0009] According to the T 当前 With the T 目标 Calculate the power P of the cooling water pump for circulating cooling water. 水泵 and according to the T 当前 With the T 目标 Calculate the electrical power P of the compressor supplying cooling water. 压缩机 ;

[0010] According to the P 水泵 and P 压缩机 Calculate the minimum power consumption of the new energy vehicle, and then calculate the supplementary power P of the range extender of the new energy vehicle. 补电 ;

[0011] The actual heat dissipation capacity of the intercooler of the new energy vehicle is obtained based on the ambient temperature.

[0012] The theoretical heat dissipation capacity of the intercooler is calculated and compared with the actual heat dissipation capacity of the intercooler to determine whether the turbocharger of the new energy vehicle is working, and the final engine speed of the new energy vehicle for low-battery static charging is determined based on whether the turbocharger is working.

[0013] Preferably, the step according to the T 当前 With the T 目标 Calculate the power P of the cooling water pump for circulating cooling water. 水泵 and according to the T 当前 With the T 目标 The compressor power P that supplies cooling water 压缩机 include:

[0014] Calculate the current temperature T of the power battery. 当前 and the target temperature T 目标 The difference ΔT;

[0015] The cooling power P used to cool the power battery to the target temperature is calculated based on the difference ΔT. 冷却 ;

[0016] According to the cooling water pump power P 冷却 Calculate the cooling flow rate Q and battery inlet water temperature T corresponding to cooling the power battery to the target temperature. 入水 ;

[0017] Based on the cooling flow rate Q and the battery inlet water temperature T 入水 Calculate the power P of the cooling water pump that provides cooling water circulation. 水泵 and according to the T 当前 With the T 目标 Calculate the electrical power P of the compressor that provides cooling water. 压缩机 .

[0018] Preferably, the cooling water pump power P 水泵 Obtained through PQ curves.

[0019] Preferably, the step according to P 水泵 and P 压缩机 Calculate the minimum power consumption of the new energy vehicle, and then calculate the supplementary power P of the range extender of the new energy vehicle. 补电 include:

[0020] According to the P 水泵 and P 压缩机 Calculate the minimum power consumption of the new energy vehicle;

[0021] The range extender's replenishment power is calculated based on the minimum power consumption and the charging power of the power battery; the charging power of the power battery is the charging power that charges the power battery's SOC to a preset threshold.

[0022] Preferably, the preset threshold is any value between 3% and 5%.

[0023] Preferably, obtaining the actual heat dissipation capacity of the intercooler of the new energy vehicle based on the ambient temperature includes:

[0024] The power battery is divided into two operating conditions: absolute static condition and relative static condition. Under different operating conditions, the actual heat dissipation capacity of the intercooler of the new energy vehicle is obtained by referring to the ambient temperature-actual heat dissipation capacity table.

[0025] The absolute static condition refers to the condition where the speed of the new energy vehicle is zero, and the relative static condition refers to the condition where the speed of the new energy vehicle is less than 10 km / h and greater than 0.

[0026] Preferably, the theoretical heat dissipation capacity of the intercooler is the heat dissipation capacity required by the intercooler to reduce the exhaust temperature of the turbocharger to the target intake temperature of the range extender. Calculating the theoretical heat dissipation capacity of the intercooler includes: calculating the static theoretical heat dissipation capacity of the intercooler based on the exhaust temperature of the turbocharger and the target intake temperature of the range extender.

[0027] Preferably, the step of calculating the theoretical heat dissipation capacity of the intercooler and comparing it with the actual heat dissipation capacity of the intercooler to determine whether the turbocharger of the new energy vehicle is working includes:

[0028] If the static theoretical heat dissipation capacity of the intercooler is greater than the actual heat dissipation capacity of the intercooler, the turbocharger will not work.

[0029] If the static theoretical heat dissipation capacity of the intercooler is less than or equal to the actual heat dissipation capacity of the intercooler, the turbocharger will operate.

[0030] Preferably, determining the final engine speed of the new energy vehicle for low-battery static charging based on whether the turbocharger is working includes:

[0031] When the turbocharger is not operating, the final engine speed is determined as follows:

[0032] According to the supplementary power P of the range extender 补电 Calculate the static engine speed V 静态发动机转速 ;

[0033] Determine the V 静态发动机转速 Does the engine speed meet the NVH requirements? If it does, proceed to the next step; otherwise, obtain the V value again. 静态发动机转速 ;

[0034] Determine the V 静态发动机转速 Is the fuel-efficient engine speed met? If so, proceed to the next step; otherwise, re-obtain V. 静态发动机转速 ;

[0035] Output the V 静态发动机转速 This refers to the final engine speed used for static charging when the battery is low.

[0036] When the turbocharger is operating, the final engine speed is determined as follows:

[0037] The turbocharger boost is calculated based on the turbocharger outlet air temperature, and then the final static fuel speed V is determined based on the turbocharger boost. 静态发动机转速 .

[0038] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a data processing program is stored, the data processing program being executed by a processor as described above in a method for replenishing static fuel when the battery is low in a range-extended or hybrid vehicle.

[0039] Based on the above technical solution, the static fuel replenishment method for low-battery new energy vehicles provided in this application has the following technical effects:

[0040] This invention targets new energy vehicles, particularly range-extended or hybrid vehicles with small front-end openings and intercoolers cooled by natural airflow. When the vehicle is in a static state, the water pump and compressor power required to cool the battery to its optimal charging efficiency are determined based on the battery temperature. This ensures the battery is charged within its optimal range, improving charging efficiency. Furthermore, for this specific vehicle type where the intercooler relies on natural airflow for cooling, when calculating engine speed for battery charging, the invention compares the theoretical and actual cooling capacity of the intercooler to determine whether the turbocharger is operating, thereby determining the engine charging speed. This allows the battery to complete charging in the shortest time and with the highest charging efficiency, enhancing the user experience. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A flowchart illustrating a method for static fuel replenishment for low battery levels in new energy vehicles, provided as an embodiment of this application;

[0043] Figure 2 Provided for embodiments of this application according to the T 当前 With the T 目标 Obtain the power P of the cooling water pump circulating cooling water. 水泵 And the electrical power P of the compressor that provides cooling water 压缩机 The flowchart. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0045] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] Example 1: As mentioned in the background section, in view of the problems in the prior art, this application proposes a method for static fuel replenishment of low battery levels in new energy vehicles. This replenishment method can be executed by the electronic control unit (ECU) of a range-extended or hybrid vehicle. Figure 1 This is a flowchart illustrating a method for static fuel replenishment of a new energy vehicle when its battery is low, as provided in an embodiment of this application. See also... Figure 1 A method for static fuel replenishment of a range-extended or hybrid vehicle when the battery is low, wherein, in this embodiment, low battery refers to a state of charge (SOC) of the power battery of less than 3%; the static condition refers to a vehicle speed of less than 10 km / h; the method includes the following steps:

[0047] S101: Obtain the current temperature T of the power battery of the new energy vehicle. 当前 And the target temperature T corresponding to the optimal charging efficiency of the power battery. 目标 ;

[0048] Since this embodiment addresses range-extended or hybrid vehicles operating under static conditions, if the electric vehicle's battery has a low charge, the driver will certainly want to get the battery out of the low charge range as quickly as possible to ensure that various electrical devices in the vehicle can operate normally. To charge the battery with as much power as possible in the shortest possible time, the battery must be within the temperature range corresponding to its optimal charging efficiency. Generally, for a certain type of battery, the temperature range corresponding to its optimal charging efficiency is 20-30℃. Since low battery conditions often occur in summer, the battery needs to be cooled. Therefore, it is necessary to calculate the power required for battery cooling.

[0049] Specifically, step 1 includes:

[0050] S1011: Detecting the current temperature T of the power battery in a new energy vehicle. 当前 ;

[0051] Specifically, the current temperature of the power battery is detected using the temperature sensor built into the power battery BMS system;

[0052] S1012: Determine the target temperature T of the power battery of the new energy vehicle to be in the optimal charging range. 目标 ;

[0053] Specifically, the target temperature can be determined by consulting the battery's instruction manual based on the battery model; or by conducting a preset number of charging tests on the battery to determine the target temperature T. 目标 ;

[0054] It is worth emphasizing that, in this embodiment, the target temperature for the power battery to be in the optimal charging range is a specific temperature value;

[0055] S102: According to the T 当前 With the T 目标 Obtain the power P of the cooling water pump circulating cooling water. 水泵 And the electrical power P of the compressor that provides cooling water 压缩机 ;

[0056] Specifically, such as Figure 2 As shown, S102 specifically includes:

[0057] S1021: Calculate the difference ΔT between the current temperature of the power battery and the target temperature of the power battery;

[0058] Specifically, the formula for calculating ΔT is: ΔT = T 当前 -T 目标 ;

[0059] S1022: Calculate the cooling power P for cooling the power battery to the target temperature based on the difference ΔT. 冷却 ;

[0060] Specifically, the P 冷却 The calculation formula is: P 冷却 =ΔT*C*M;

[0061] In the formula, C is the heat capacity of the power battery, and M is the mass of the power battery;

[0062] S1023: According to the cooling water pump power P 冷却 Calculate the cooling flow rate Q and battery inlet water temperature T corresponding to cooling the power battery to the target temperature. 入水 ;

[0063] Specifically, the battery cooling flow rate Q is the flow rate of cooling water used to cool the power battery to the target temperature, and the battery inlet water temperature T is... 入水 The temperature of the cooling water input to the battery is the temperature at which the power battery is cooled to the target temperature;

[0064] In the cooling system of a range-extended or hybrid vehicle, the battery needs to be cooled by cooling water through a water-cooled plate, and the cooling water needs to be cooled by a compressor.

[0065] Specifically, the battery cooling flow rate Q and the battery water inlet temperature T corresponding to cooling the power battery to the target temperature... 入水 The calculation formula is:

[0066] T 入水 =T 当前冷却液温度 -Q / (h*A*u) (Formula 1)

[0067] In the formula, T 当前冷却液温度 The known quantities are obtained by sensor detection. Q is the battery cooling flow rate, h is the convective heat transfer coefficient between the coolant and the water-cooled plate, A is the heat transfer area of ​​the water-cooled plate, and u is the heat transfer coefficient from the water-cooled plate to the battery.

[0068] In the above formula, u is an empirical coefficient, and in this embodiment, u is taken as 0.98;

[0069] In the formula, the convective heat transfer coefficient h is an unknown quantity, which needs to be calculated using the following formula:

[0070] Specifically, the formula for calculating the convective heat transfer coefficient h is as follows:

[0071]

[0072] In the formula, Nu is the Nusselt number; λ is the thermal conductivity of the liquid; and cdim is the diameter of the cooling pipe.

[0073] Where cdim and λ are known quantities, the value of Nu can be used to obtain the value of the convective heat transfer coefficient h.

[0074] In this embodiment, the formula for calculating Nu is:

[0075] Nu = 0.037 * Re 0.8 *Pr (1 / 3) (Formula 3)

[0076] In the formula, Re is the Reynolds number and Pr is the Prandtl number;

[0077] The formula for calculating the Reynolds number Re is:

[0078]

[0079] In the formula, vFluid is the coolant flow rate = coolant volumetric flow rate / cooling pipe area; cdim is the cooling pipe diameter; and p is the coolant density.

[0080] The formula for calculating the Prandtl number Pr is as follows:

[0081]

[0082] In the formula, μ is the dynamic viscosity coefficient, Cp is the specific heat of the fluid, and λ is the thermal conductivity.

[0083] It is worth emphasizing that the battery cooling flow rate Q and the battery inlet water temperature T are calculated using the above formulas. 入水 Generally, an initial value is assigned to Q, and then through continuous iteration, the left and right sides of the equation (1) are made equal, thus obtaining the battery cooling flow rate Q and the battery water inlet temperature T. 入水 .

[0084] S1024: Based on the cooling flow rate Q and the battery inlet water temperature T 入水 Calculate the power P of the cooling water pump that provides cooling water circulation. 冷却 And the electrical power P of the compressor that provides cooling water 压缩机 ;

[0085] Specifically, since the battery cooling flow rate Q has been obtained through calculation, the cooling water pump power P 水泵 Obtained by consulting the PQ curve;

[0086] In reality, when cooling the power battery with a compressor, due to the issue of cooling efficiency, the electrical power of the compressor and the cooling power of the power battery are not equal.

[0087] In this embodiment, the formula for calculating the compressor's electrical power is:

[0088] P 压缩机 =P 冷却 / (Heat exchange efficiency * Refrigeration system COP)

[0089] In the formula, the heat exchange efficiency is the heat exchange efficiency of the plate heat exchanger;

[0090] Therefore, steps 1-2 can obtain the power consumption required to cool the battery to the optimal charging range. It is worth emphasizing that in order to improve the charging efficiency, this embodiment first cools the battery temperature so that the battery temperature is at the temperature value of the optimal charging efficiency. Compared with the prior art, this greatly improves the charging efficiency and reduces the charging time.

[0091] It is worth emphasizing that, since the temperature of the power battery changes when it is recharged, the current temperature T of the power battery is repeatedly detected at a fixed frequency throughout the recharging process in this embodiment. 当前 This allows for continuous adjustment of the cooling power P that cools the power battery to the target temperature. 冷却Calculate the compressor's electrical power P 压缩机电功率 .

[0092] S103: According to the aforementioned P 水泵 and P 压缩机 Calculate the minimum power consumption of the new energy vehicle, and then calculate the supplementary power P of the range extender of the new energy vehicle. 补电 ;

[0093] Specifically, as can be seen from the above introduction, the power consumption of the car at this time is mainly divided into two parts: one part is the power of the compressor required to cool the power battery to the target temperature, and the other part is the low-voltage power required for the range-extended or hybrid vehicle; for example, the power of the monitoring elements that are required to monitor certain components of the range-extended or hybrid vehicle.

[0094] At this point, the formula for calculating the minimum power consumption of the range-extended or hybrid vehicle is:

[0095] P 最低耗电功率 =P 压缩机 +P 整车低压耗电功率

[0096] It is worth emphasizing that, in this embodiment, the cooling water pump power P 水泵 Belongs to P 整车低压耗电功率 Part of it; that is, in this embodiment, the power of the cooling water pump is included in the low-voltage power consumption range of the whole vehicle for the calculation of the minimum power consumption.

[0097] Then according to P 最低耗电功率 The supplementary power P of the range extender was calculated. 补电 ;

[0098] Specifically, the power consumption in this embodiment is used for cooling the power battery, maintaining the necessary low-voltage power consumption of the vehicle, and replenishing the power battery so that the power battery can quickly leave the low-power range and restore the various functions of the car to normal.

[0099] Therefore, the supplementary power P of the range extender 补电 The calculation formula is:

[0100] P 补电 =P 充电 +P 最低耗电功率

[0101] In the formula, P 充电 The power supplied by the range extender to the power battery is used to allow the power battery to leave the low-charge range as quickly as possible.

[0102] The range extender's replenishment power is calculated based on the minimum power consumption and the charging power of the power battery; the charging power of the power battery is the charging power that charges the power battery's SOC to a preset threshold.

[0103] Preferably, the preset threshold is any value between 3% and 5%;

[0104] S104: Obtain the actual heat dissipation capacity of the intercooler of the new energy vehicle based on the ambient temperature;

[0105] As can be seen from the above description, this embodiment is aimed at an intercooler that relies on natural air intake for cooling. Therefore, the actual heat dissipation capacity of the intercooler is related to the ambient temperature.

[0106] Furthermore, since the intercooler relies on natural air intake for cooling, its actual heat dissipation capacity is also related to the vehicle speed; the higher the vehicle speed, the lower its actual heat dissipation capacity.

[0107] This embodiment mainly considers the fuel replenishment strategy of range-extended or hybrid vehicles under static conditions. In fact, the static conditions of range-extended or hybrid vehicles are divided into two types: absolute static and relative static. The absolute static condition is the condition in which the speed of the range-extended or hybrid vehicle is zero, and the relative static condition is the condition in which the speed of the range-extended or hybrid vehicle is less than 10.

[0108] Furthermore, this embodiment determines the actual heat dissipation capacity of the intercooler using the following table;

[0109] When the range-extended or hybrid vehicle is in an absolutely static condition, the ambient temperature and the actual heat dissipation capacity of the intercooler are shown in the table below.

[0110] Table 1: Data on Ambient Temperature under Absolute Static Operating Conditions and Actual Heat Dissipation Capacity of Intercooler

[0111] Ambient temperature / °C -20 -10 0 10 20 30 40 Actual heat dissipation capacity / kW 3 2.5 2 1 1 0 0

[0112] When the range-extended or hybrid vehicle is in a relatively static operating condition, the ambient temperature and the actual heat dissipation capacity of the intercooler are shown in the table below.

[0113] Table 2: Data on Ambient Temperature under Relative Static Operating Conditions and Actual Heat Dissipation Capacity of the Intercooler

[0114] Ambient temperature / °C -20 -10 0 10 20 30 40 Actual heat dissipation capacity / kW 3.05 2.51 2.02 1.03 1.01 0 0

[0115] S105: Calculate the theoretical heat dissipation capacity of the intercooler and compare it with the actual heat dissipation capacity of the intercooler to determine whether the turbocharger of the new energy vehicle is working, and determine the final engine speed of the new energy vehicle for low-battery static charging based on whether the turbocharger is working.

[0116] The static theoretical heat dissipation capacity of the intercooler is the heat dissipation capacity required by the intercooler to reduce the exhaust temperature of the turbocharger to the target intake temperature of the range extender.

[0117] In fact, after the turbocharger compresses the combustion air, the temperature of the combustion air will also rise as the pressure of the combustion air increases. Therefore, an intercooler is needed to cool the combustion air. At this time, the static theoretical heat dissipation capacity of the intercooler can be calculated based on the exhaust temperature of the turbocharger.

[0118] Specifically, the static theoretical heat dissipation capacity of the intercooler = (turbocharger outlet temperature - range extender intake target temperature) * outlet mass flow rate * outlet specific heat at constant pressure;

[0119] Compare the static theoretical heat dissipation capacity of the intercooler with its actual heat dissipation capacity. If the static theoretical heat dissipation capacity of the intercooler is greater than its actual heat dissipation capacity, the turbocharger will not work; if the static theoretical heat dissipation capacity of the intercooler is less than or equal to its actual heat dissipation capacity, the turbocharger will work.

[0120] In fact, the actual heat dissipation capacity of the intercooler affects whether the turbocharger can engage. For example, if the actual heat dissipation capacity of the intercooler is small, its cooling capacity is weak, and it cannot reduce the exhaust temperature of the turbocharger to the appropriate combustion air temperature of the range extender, so the turbocharger will not work. If the actual heat dissipation capacity of the intercooler is large, its cooling capacity is strong, and the turbocharger can work normally.

[0121] Furthermore, when the turbocharger is not working, the final engine speed is determined as the static fuel replenishment speed;

[0122] At this time, the range extender's engine mainly relies on naturally aspirated fuel for power replenishment. Therefore, based on the range extender's power replenishment P... 补电 Determine the final engine speed of the range extender;

[0123] Specifically, determining the final engine speed as the static fuel-electricity replenishment speed when the turbocharger is not operating includes:

[0124] According to the supplementary power P of the range extender 补电 Calculate the static engine speed;

[0125] Specifically, the formula for calculating the static engine speed is:

[0126] V 静态发动机转速 =P 补电 *9550 / torque

[0127] Specifically, the V 静态发动机转速 Torque can be obtained through the engine map;

[0128] Determine the V 静态发动机转速 whether it meets the rotational speed requirement of NVH; if it meets, enter S1103, if it does not meet, obtain V again 静态发动机转速 ;

[0129] Specifically, whether the V 静态发动机转速 meets the rotational speed requirement of NVH is specifically: the V 静态发动机转速 <the maximum static rotational speed of the engine allowed by NVH, and the V 静态发动机转速 ≠resonance point rotational speed;

[0130] Furthermore, from the above description, it can be seen that the static working condition is divided into absolute static working condition and relative static working condition. Under different working conditions, the maximum static rotational speed of the engine allowed by NVH is also different;

[0131] Exemplarily, for a certain type of range extender, when its vehicle speed is zero (absolute static), the maximum static rotational speed allowed by NVH is 1800; when its vehicle speed is less than 10 km / h and greater than 0 (relative static), the maximum static rotational speed allowed by NVH is 2000;

[0132] Determine whether the V 静态发动机转速 meets the fuel economy rotational speed; if it meets, enter the next step, if it does not meet, obtain V again 静态发动机转速 ;

[0133] Specifically, whether the V 静态发动机转速 meets the fuel economy rotational speed is specifically: the V 静态发动机转速 <maximum fuel economy rotational speed;

[0134] Output the V 静态发动机转速 as the final static fuel rotational speed;

[0135] Furthermore, when the turbocharger works, determine the final rotational speed of the engine as the static fuel charging rotational speed;

[0136] Specifically, when the turbocharger works, in fact, its turbocharging degree during operation is limited by the actual heat dissipation capacity of the intercooler; therefore, calculate the size of the turbocharging degree according to the outlet temperature of the turbocharger, and then determine the final static fuel rotational speed according to the turbocharging degree.

[0137] Furthermore, in this step, the final static fuel rotational speed also needs to consider whether it meets the NVH requirement and whether it meets the fuel economy requirement. The specific steps are the same as those when the turbocharger does not work, and will not be specifically described here.

[0138] In the above steps, this embodiment calculates the charging power of the range extender, and based on the specific structure of the range extender or hybrid vehicle, which relies on natural air intake for cooling of the front intercooler, it monitors the ambient temperature to determine whether the turbocharger is engaged in engine operation, thereby determining the final speed. The engine uses the final speed to fuel, thus achieving the charging of electricity in the shortest time and with the highest charging efficiency.

[0139] Example 2: This example includes a computer-readable storage medium storing a data processing program. The data processing program is executed by a processor according to Example 1, which describes a method for static fuel-powered replenishment of new energy vehicles with low battery levels.

[0140] Those skilled in the art will understand that the embodiments described herein can be provided as methods, apparatus (devices), or computer program products. Therefore, this document may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. This includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0141] This document is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (devices), and computer program products according to embodiments herein. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0142] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0143] It should be noted that the terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the scope of this application. As shown in the specification and claims of this application, unless the context clearly indicates otherwise, words such as "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, or apparatus. Without further limitations, an element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element.

[0144] It should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0145] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art can make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as the technology or embodiments that are substantially the same as the present invention.

[0146] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A method for static fuel replenishment of a new energy vehicle when its battery is low, characterized in that, include: Obtain the current temperature T of the power battery of the new energy vehicle. 当前 And the target temperature T corresponding to the optimal charging efficiency of the power battery. 目标 ; According to the T 当前 With the T 目标 Calculate the power P of the cooling water pump for circulating cooling water. 水泵 and according to the T 当前 With the T 目标 Calculate the electrical power P of the compressor supplying cooling water. 压缩机 ; According to the P 水泵 and P 压缩机 Calculate the minimum power consumption of the new energy vehicle, and then calculate the supplementary power P of the range extender of the new energy vehicle. 补电 ; The actual heat dissipation capacity of the intercooler of the new energy vehicle is obtained based on the ambient temperature. The theoretical heat dissipation capacity of the intercooler is calculated and compared with the actual heat dissipation capacity of the intercooler to determine whether the turbocharger of the new energy vehicle is working, and the final engine speed of the new energy vehicle for low-battery static charging is determined based on whether the turbocharger is working.

2. The method for static fuel replenishment of new energy vehicles with low battery levels according to claim 1, characterized in that, According to the T 当前 With the T 目标 Calculate the power P of the cooling water pump for circulating cooling water. 水泵 and according to the T 当前 With the T 目标 The compressor power P that supplies cooling water 压缩机 include: Calculate the current temperature T of the power battery. 当前 and the target temperature T 目标 The difference ΔT; The cooling power P used to cool the power battery to the target temperature is calculated based on the difference ΔT. 冷却 ; According to the cooling water pump power P 冷却 Calculate the cooling flow rate Q and battery inlet water temperature T corresponding to cooling the power battery to the target temperature. 入水 ; Based on the cooling flow rate Q and the battery inlet water temperature T 入水 Calculate the power P of the cooling water pump that provides cooling water circulation. 水泵 and according to the T 当前 With the T 目标 Calculate the electrical power P of the compressor that provides cooling water. 压缩机 .

3. The method for static fuel replenishment of new energy vehicles with low battery levels according to claim 2, characterized in that, The cooling water pump power P 水泵 Obtained through PQ curves.

4. The method for static fuel replenishment of new energy vehicles with low battery levels according to claim 1, characterized in that, According to the P 水泵 and P 压缩机 Calculate the minimum power consumption of the new energy vehicle, and then calculate the supplementary power P of the range extender of the new energy vehicle. 补电 include: According to the P 水泵 and P 压缩机 Calculate the minimum power consumption of the new energy vehicle; The range extender's replenishment power is calculated based on the minimum power consumption and the charging power of the power battery; the charging power of the power battery is the charging power that charges the power battery's SOC to a preset threshold.

5. The method for static fuel replenishment of new energy vehicles with low battery levels according to claim 4, characterized in that, The preset threshold is any value between 3% and 5%.

6. The method for static fuel replenishment of low-battery new energy vehicles according to claim 1, characterized in that, The method of obtaining the actual heat dissipation capacity of the intercooler of the new energy vehicle based on the ambient temperature includes: The power battery is divided into two operating conditions: absolute static condition and relative static condition. Under different operating conditions, the actual heat dissipation capacity of the intercooler of the new energy vehicle is obtained by referring to the ambient temperature-actual heat dissipation capacity table. The absolute static condition refers to the condition where the speed of the new energy vehicle is zero, and the relative static condition refers to the condition where the speed of the new energy vehicle is less than 10 km / h and greater than 0.

7. The method for static fuel replenishment of new energy vehicles with low battery levels according to claim 1, characterized in that, The theoretical heat dissipation capacity of the intercooler is the heat dissipation capacity required for the intercooler to reduce the exhaust temperature of the turbocharger to the target intake temperature of the range extender. Calculating the theoretical heat dissipation capacity of the intercooler includes: calculating the static theoretical heat dissipation capacity of the intercooler based on the exhaust temperature of the turbocharger and the target intake temperature of the range extender.

8. The method for static fuel replenishment of low-battery new energy vehicles according to claim 1, characterized in that, The step of calculating the theoretical heat dissipation capacity of the intercooler and comparing it with the actual heat dissipation capacity of the intercooler to determine whether the turbocharger of the new energy vehicle is working includes: If the static theoretical heat dissipation capacity of the intercooler is greater than the actual heat dissipation capacity of the intercooler, the turbocharger will not work. If the static theoretical heat dissipation capacity of the intercooler is less than or equal to the actual heat dissipation capacity of the intercooler, the turbocharger will operate.

9. The method for static fuel replenishment of a new energy vehicle with low battery capacity according to claim 1, characterized in that, The determination of the final engine speed of the new energy vehicle used for low-battery static charging based on whether the turbocharger is working includes: When the turbocharger is not operating, the final engine speed is determined as follows: According to the supplementary power P of the range extender 补电 Calculate the static engine speed V 静态发动机转速 ; Determine the V 静态发动机转速 Does the engine speed meet the NVH requirements? If it does, proceed to the next step; otherwise, obtain the V value again. 静态发动机转速 ; Determine the V 静态发动机转速 Is the fuel-efficient engine speed met? If so, proceed to the next step; otherwise, re-obtain V. 静态发动机转速 ; Output the V 静态发动机转速 The final engine speed used for static charging when the battery is low; When the turbocharger is operating, the final engine speed is determined as follows: The turbocharger boost is calculated based on the turbocharger outlet air temperature, and then the final static fuel speed V is determined based on the turbocharger boost. 静态发动机转速 .

10. A computer-readable storage medium storing a data processing program, wherein the data processing program is executed by a processor according to any one of claims 1-9, the method for static fuel replenishment of a new energy vehicle with low battery level.

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