A method and system for controlling a range extender for a construction machine to adapt to a low-temperature battery

Abstract

This invention proposes a control method and system for low-temperature batteries adapted to range extenders used in engineering machinery. The control system determines the required SOC value of the battery based on different ambient temperature requirements. According to the engine start-up map and battery discharge map, it determines the preset battery SOC level map required to start the engine at all temperatures. Based on the ambient temperature, it compares the current temperature with the minimum battery discharge temperature. If the temperature is lower than the minimum discharge temperature, it uses PTC or other heating methods to heat the battery to the minimum discharge temperature, at which point the range extender starts and idles. Based on the actual battery temperature and the battery charging map, the range extender generates electricity using the sum of the minimum charging power of the battery and the load power. Finally, the minimum SOC level is the battery SOC required to start the engine at the lowest temperature. If the SOC level is higher than this value, the battery participates in the operation. This method solves the problem of insufficient battery SOC preventing the range extender from starting at low temperatures.

Description

Technical Field

[0001] This invention relates to a control method and system for a low-temperature battery adapted to a range extender used in engineering machinery, belonging to the field of new energy engineering machinery vehicles. Background Technology

[0002] With the development of new energy technologies, pure electric and hybrid construction machinery are also developing rapidly. Due to the special nature of construction machinery working scenarios, it is difficult to recharge pure electric power in some areas, and it needs to operate 24 hours a day. Therefore, there is a great demand for hybrid products. At the same time, in order to make up for the shortcomings of pure electric products in terms of recharging, hybrid range-extended systems are adopted.

[0003] When range extenders are installed and applied, there are significant temperature differences in different regions. If a low SOC strategy is uniformly adopted for power generation, the engine may fail to start in low-temperature conditions. If a high SOC strategy is uniformly adopted for power generation, the engine may start and stop too frequently, leading to a reduction in engine life. To balance environmental conditions and engine life, it is urgent to develop a low-temperature battery control method and system for range extenders used in engineering machinery.

[0004] In the prior art, Chinese patent application CN117818576A, a method, apparatus, and device for starting a range extender, provides a SOC setting based on the SOC of the power reserve and the SOC of the range extender when it starts working, as well as the SOC in pure electric mode. However, it does not set different SOC values ​​based on different regions and ambient temperatures, nor does it implement relevant strategies for low-temperature startup.

[0005] Chinese patent application CN110816308B, concerning a method, apparatus, and range-extended electric vehicle for controlling the start-up of a range extender, applies to range-extended electric vehicles and is suitable for environments with stringent requirements for exhaust emissions and noise pollution. It focuses on addressing emission and noise pollution issues but does not include any strategies for low-temperature start-up.

[0006] Chinese patent application CN211623591U discloses a low-temperature starting device for an alcohol fuel engine range extender. It is mainly used for a low-temperature starting device for an alcohol fuel engine range extender, but it is unrelated to control and does not include any strategies for low-temperature starting. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and system for controlling low-temperature batteries for range extenders used in engineering machinery; based on different environmental temperature requirements, it is confirmed that the battery needs to retain its SOC value to ensure that the battery can be used normally at different temperatures.

[0008] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0009] In a first aspect, the present invention provides a method for controlling a low-temperature battery adapted to a range extender for engineering machinery, comprising the following steps:

[0010] Obtain a preset mapping table of ambient temperature and actual required reserve power; the mapping table of ambient temperature and actual required reserve power is used to represent the correlation between ambient temperature and the reserve power required to start the engine.

[0011] Obtain the ambient temperature value T of the battery and compare the ambient temperature value T with the minimum discharge temperature of the battery;

[0012] When the ambient temperature T is greater than the minimum discharge temperature of the battery, the actual required reserve capacity corresponding to the ambient temperature T is obtained according to the ambient temperature and the preset mapping table of ambient temperature and actual required reserve capacity; the range extender is controlled to make the battery's state of charge (SOC) greater than the actual required reserve capacity corresponding to the ambient temperature T.

[0013] When the ambient temperature T is less than or equal to the battery's minimum discharge temperature, the battery temperature is heated to a preset battery temperature, which is greater than or equal to the battery's minimum discharge temperature. Based on the mapping table between the battery's minimum discharge temperature, the preset ambient temperature, and the actual required retained capacity, the actual required retained capacity corresponding to the battery's minimum discharge temperature is obtained. The range extender is controlled to make the battery's state of charge (SOC) greater than the actual required retained capacity corresponding to the battery's minimum discharge temperature.

[0014] Furthermore, the method for establishing the preset ambient temperature and actual required power reserve mapping table includes:

[0015] Obtain the engine start-up map and the battery discharge map; the engine start-up map is used to represent the correlation between ambient temperature and start-up power; the battery discharge map is used to represent the correlation between ambient temperature, power and state of charge (SOC) of the battery.

[0016] Extract the starting power corresponding to each ambient temperature in the engine starting Map, obtain the SOC of the battery corresponding to the ambient temperature and starting power through the battery discharge Map as the minimum starting battery SOC1 for the corresponding ambient temperature, establish the correlation mapping relationship between ambient temperature and minimum starting battery SOC1, and form a mapping table between ambient temperature and minimum starting battery SOC1.

[0017] Obtain the region and season where the battery is located, and determine the preset battery capacity X based on the region and season.

[0018] In the mapping table between ambient temperature and minimum battery starting capacity SOC1, the minimum battery starting capacity SOC1 corresponding to each ambient temperature is added to the battery preset margin X to form the required reserve capacity SOC2 for starting the engine corresponding to each ambient temperature. The correlation mapping relationship between ambient temperature and the required reserve capacity SOC2 for starting the engine is established, and the mapping table between ambient temperature and actual required reserve capacity is obtained.

[0019] Furthermore, methods for obtaining the engine start-up map include:

[0020] Based on theoretical engine data and actual cold start test data, an engine start-up map is obtained;

[0021] Methods for obtaining the battery discharge map include:

[0022] Obtain theoretical data for the battery pack, and then perform multiple BMS calibrations and verifications based on the theoretical data to obtain the final, real battery discharge map.

[0023] Furthermore, methods for determining the battery's preset margin X based on the battery's location and season include:

[0024] Determine the ambient temperature range of the battery based on the region and season in which the battery is located;

[0025] Based on the ambient temperature range of the battery and the engine start-up map, multiple BMS calibrations were performed based on theoretical data to obtain the battery preset margin X corresponding to the region and season where the battery is located.

[0026] Furthermore, a method for heating the battery to a preset battery temperature includes heating the battery using a PTC electric heater.

[0027] Furthermore, the method also includes:

[0028] When the ambient temperature is less than or equal to the battery's minimum discharge temperature T1, start the range extender and run it at idle speed.

[0029] The minimum power that the battery can charge at the corresponding preset battery temperature is obtained, and the range extender is controlled to generate electricity at the sum of the minimum power that the battery can charge and the load power.

[0030] Furthermore, the minimum charging power and the minimum charging temperature of the battery are obtained from the battery charging map; the battery charging map is used to represent the correlation between ambient temperature and charging power.

[0031] Furthermore, controlling the range extender to ensure the battery's state of charge (SOC) is greater than the actual required reserve capacity corresponding to the ambient temperature value T includes:

[0032] When the battery's SOC is much greater than the actual required reserve capacity SOCT corresponding to the ambient temperature value T: the range extender is activated, the battery is controlled to work, and the range extender is not working.

[0033] When the battery's State of Charge (SOC) approaches the actual required reserve capacity (SOCT) corresponding to the ambient temperature value T: the range extender is started, controlled to generate electricity at the optimal generator power, and the battery is fully charged until the SOC reaches 80%, after which the range extender stops.

[0034] "Much greater than" is defined as: 10% or more greater than the comparison value;

[0035] The nearest neighbor is defined as being within 5% above or below the comparison value.

[0036] Furthermore, controlling the range extender to ensure that the battery's state of charge (SOC) is greater than the actual required reserve capacity corresponding to the battery's minimum discharge temperature includes:

[0037] When the preset battery temperature T2 is greater than the minimum allowable battery charging temperature T 充电 hour,

[0038] If the battery's SOC is much greater than the actual required retention capacity SOCM corresponding to the battery's lowest discharge temperature T1, then the battery is controlled to work. When the battery's discharge power is much less than the total power required by the vehicle, both the battery and the range extender are controlled to work. When the battery's discharge power can meet the total power required by the vehicle, only the battery is controlled to work.

[0039] If the battery's SOC is close to the actual required retention capacity SOCM corresponding to the battery's minimum discharge temperature T1, the battery is controlled not to work, and the range extender generates electricity based on the sum of the minimum power that the battery can charge and the load power.

[0040] Furthermore, controlling the range extender to ensure that the battery's state of charge (SOC) is greater than the actual required reserve capacity corresponding to the battery's minimum discharge temperature also includes:

[0041] When the preset battery temperature T2 is less than or equal to the minimum allowable battery charging temperature T 充电 When the battery is not in operation, the range extender generates electricity based on the load power until the ambient temperature or the real-time battery temperature exceeds the minimum allowable charging temperature T. 充电 .

[0042] Furthermore, controlling the range extender to ensure that the battery's state of charge (SOC) is greater than the actual required reserve capacity corresponding to the battery's minimum discharge temperature also includes:

[0043] If the real-time battery temperature is greater than the minimum allowable charging temperature T... 充电 hour,

[0044] If the battery's SOC is much greater than the actual required retention capacity SOCM corresponding to the battery's lowest discharge temperature T1, then the battery is controlled to work. When the battery's discharge power is less than the total power required by the vehicle, both the battery and the range extender are controlled to work. When the battery's discharge power can meet the total power required by the vehicle, only the battery is controlled to work.

[0045] If the battery's SOC is close to the actual required reserve capacity SOCM corresponding to the battery's minimum discharge temperature T1, the battery is controlled to not work, and the range extender generates electricity based on the sum of the minimum power that the battery can charge and the load power.

[0046] Furthermore, the real-time battery temperature is obtained through feedback from the BMS system.

[0047] Secondly, the present invention provides a precision control system for a range extender for engineering machinery adapted to a low-temperature battery, comprising:

[0048] An ambient temperature sensor is used to collect the ambient temperature value of the battery.

[0049] Batteries are used to provide power for the load operation;

[0050] Range extenders are used to charge batteries or output power for load operations;

[0051] The controller is connected to the ambient temperature sensor, the battery, and the range extender, respectively, and is used to execute the control method as described in the first aspect based on the ambient temperature value.

[0052] Thirdly, the present invention provides an engineering machinery, including a precision control system for a low-temperature battery adapted to a range extender for engineering machinery as described in the second aspect.

[0053] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0054] (1) The ambient temperature and actual demand retention power mapping table can more accurately adapt to the control of SOC at different temperatures, ensuring that the range extender can start smoothly at all temperatures;

[0055] (2) For ultra-low temperatures, heating and precise control are adopted to achieve rapid battery heating and precise control of range extender start-up and power generation;

[0056] (3) The present invention is adapted to low temperature start control methods in different regions and seasons, thereby making the control method more robust; and based on the engine start power requirements at different temperatures and the battery discharge map, the mapping table of ambient temperature and actual demand for power retention has higher accuracy.

[0057] (4) The low-temperature start control method for range extenders for engineering machinery proposed in this invention is applicable to all types of engineering machinery vehicles and has strong robustness. Attached Figure Description

[0058] Figure 1 This is a flowchart of the low-temperature start-up control method for range extenders.

[0059] Figure 2 This is an information interaction diagram for range extenders used in construction machinery.

[0060] Figure 3 This is a flowchart of the low-temperature start-up control for the range extender. Detailed Implementation

[0061] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0062] Example 1:

[0063] like Figure 1 As shown, this invention proposes a low-temperature battery control method for range extenders used in engineering machinery; this control method determines the SOC value that the battery needs to retain based on different ambient temperature requirements; including:

[0064] Based on the engine start-up map and battery discharge map, determine the preset battery SOC level map that the engine needs to start under all temperatures;

[0065] Based on the ambient temperature, the current temperature is compared with the minimum discharge temperature of the battery. If the temperature is lower than that, a PTC (electric heater) or other heating method is used to heat the battery temperature to the minimum discharge temperature. At this time, the range extender is started and idled.

[0066] Based on the actual battery temperature and battery charging map, the range extender generates electricity using the sum of the minimum power that the battery can charge and the load power; the minimum SOC is the battery SOC that can start the engine at the lowest temperature. When the SOC is greater than this value, the battery participates in the operation.

[0067] This method solves the problem that the range extender cannot start when the battery's state of charge is insufficient at low temperatures;

[0068] Preferably, this embodiment proposes a low-temperature battery control method for range extenders used in engineering machinery. The core of this method is to determine the required SOC (State of Charge) value of the battery based on different ambient temperature requirements. Figure 3 As shown, the specific methods include:

[0069] Based on the engine start-up map and battery discharge map, a mapping table of ambient temperature and actual required reserve charge (i.e., the preset battery SOC amount to start the engine at all temperatures) is determined to represent the correlation between ambient temperature and the actual reserve charge required to start the engine.

[0070] Based on the ambient temperature, the current temperature is compared with the minimum discharge temperature of the battery. If the temperature is lower than that, a PTC (electric heater) or other heating method is used to heat the battery temperature to the minimum discharge temperature. At this time, the range extender is started and idled.

[0071] Based on the actual battery temperature (obtained through the BMS system) and the battery charging map, the range extender generates electricity with the sum of the minimum power that the battery can charge and the load power; the minimum SOC is the battery SOC that can start the engine at the lowest temperature. When the SOC is greater than this value, the battery participates in the operation.

[0072] This method solves the problem that the range extender cannot start when the battery's state of charge is insufficient at low temperatures;

[0073] Based on engine theoretical data: the engine starting power map at different temperatures, and then the starting power map corresponding to different temperatures is measured to obtain the engine's actual starting power map at different temperatures;

[0074] Table 1. Schematic diagram of engine starting power at different temperatures.

[0075]

[0076] Obtain the battery discharge map, which corresponds to different discharge durations at different temperatures; first obtain the theoretical data of the battery pack, and then obtain the final real battery discharge map based on the theoretical data through multiple BMS calibration and verification.

[0077] Table 2 Example of Battery Discharge Map

[0078]

[0079] Extract the starting power corresponding to each ambient temperature in the engine starting Map, obtain the SOC of the battery corresponding to the ambient temperature and starting power through the battery discharge Map as the minimum starting battery SOC1 for the corresponding ambient temperature, establish the correlation mapping relationship between ambient temperature and minimum starting battery SOC1, and form a mapping table between ambient temperature and minimum starting battery SOC1.

[0080] By obtaining GPS address and time information, we can determine the temperature differences in different regions and at different times of the year, as shown in Table 3.

[0081] Table 3 Temperature differences in different regions and seasons

[0082]

[0083] Temperature differences vary in different regions. Different margins are calculated based on seasonal temperature differences to ensure SOC levels. This is to prevent the loss of ambient temperature data after shutdown, so it is necessary to roughly estimate the regional season to confirm the temperature differences that cause the day.

[0084] Obtain the region and season where the battery is located, and determine the preset reserve capacity X of the battery based on the region and season; obtain a preset reserve capacity X map for different regions for different seasons based on Table 3; finally obtain the values ​​of the mapping table between ambient temperature and actual required reserve capacity for different regions for different seasons and temperatures, and use it as the actual required reserve capacity value SOC2.

[0085] like Figure 2 As shown in the figure, the control information interaction of the range extender upon which this control method relies includes the work GCU, BMS, GCU, travel GCU, VCU, ECU, and RCU. Among them, the VCU plays the main control role. By collecting information from the work GCU, BMS, travel GCU, and RCU, it generates control commands and sends them to the RCU, thereby controlling the operation of the range extender.

[0086] like Figure 3 As shown, the specific operating steps include:

[0087] Based on the ambient temperature T obtained after the vehicle is powered on, it is compared with the battery's minimum discharge temperature T1.

[0088] If the ambient temperature T is above the battery's lowest discharge temperature T1, the actual required retained capacity SOCT corresponding to the ambient temperature value T is obtained according to the above mapping table of ambient temperature and actual required retained capacity. The SOCT value is stored and recorded, and the battery SOC is kept above SOCT.

[0089] If the ambient temperature is below the minimum temperature, the battery pack is first heated to the minimum discharge temperature T1 using a heating device (such as PTC), and then further heated to the preset battery temperature T2, which is greater than or equal to the minimum discharge temperature T1. At this time, the range extender starts idling, monitors the battery temperature fed back by the BMS and compares it with the preset battery temperature T2. When the battery pack is rechargeable, it charges the battery with the allowed charging power to speed up the battery heating time so that it can be gradually charged with high power.

[0090] If the ambient temperature T > T1, then record the actual required power reserve SOCT corresponding to that ambient temperature value T, as shown in Table 4:

[0091] Table 4. Operating control flow table for ambient temperature T > T1

[0092]

[0093] The above ensures the duration of optimal power generation by the range extender, reducing fuel consumption; when the SOC is not in a situation mentioned in the table, the original control state is retained.

[0094] If the ambient temperature T ≤ T1, then record the actual required residual capacity SOCM corresponding to the lowest discharge temperature of the battery; T 充电 The minimum allowable temperature for charging is specified in Table 5.

[0095] Table 5. Operating Control Flowchart for Ambient Temperature T≤T1

[0096]

[0097] "Much greater than" is defined as: 10% or more greater than the comparison value;

[0098] "Much greater than" is defined as: less than 10% or more of the comparison value;

[0099] The nearest neighbor is defined as being within 5% above or below the comparison value.

[0100] The above mode ensures that the range extender can start normally under low temperature conditions, while maintaining the battery to heat up quickly to a temperature suitable for charging and discharging.

[0101] In some embodiments, the overall steps of this method include:

[0102] Step S1: Obtain the preset ambient temperature and actual required power reserve mapping table:

[0103] (1) Based on the engine's theoretical data and cold start test data, confirm the engine start-up map; this map is determined by each engine itself, and the static friction force of the engine needs to be overcome at the moment of start-up. Confirm the required power torque reduction by conducting low-temperature start-up tests on the engine prototype and based on different problems.

[0104] (2) Obtain the battery discharge map, the battery discharge map corresponding to different temperatures and different durations of discharge; first obtain the theoretical data of the battery pack, and then obtain the final real battery discharge map based on the theoretical data through multiple BMS calibration and verification.

[0105] Based on the above steps (1) and (2), a mapping table between ambient temperature and the minimum starting capacity SOC1 of the battery is obtained; the input of the temperature and discharge SOC mapping table is the ambient temperature, and the output is the actual starting capacity value SOC1 corresponding to the ambient temperature;

[0106] Based on GPD, obtain regional and seasonal information, confirm the local seasonal temperature differences, and obtain a preset margin X for different regions for different seasons;

[0107] Based on the actual starting power value SOC1, the actual required reserve power value SOC2 is obtained from X values ​​in different regions and seasons to ensure a certain margin. A mapping relationship is established between ambient temperature and the required reserve power SOC2 for starting the engine, resulting in an ambient temperature-actual required reserve power mapping table. This table represents the mapping relationship between ambient temperature and the actual required reserve power for starting the engine. Its format is that the horizontal axis is temperature, and the vertical axis is the required SOC2; based on the ambient temperature, the required SOC2 is determined. The purpose of this ambient temperature-actual required reserve power mapping table is to obtain the battery capacity corresponding to the starting power at different temperatures.

[0108] The battery discharge map and power generation map are derived from the battery's BMS. Each package contains theoretical data, and the final version of the data needs to be calibrated and locked later.

[0109] Step S2: When the ambient temperature T > the minimum battery discharge temperature T1, confirm the range extender's operating mode:

[0110] (1) Based on the comparison between ambient temperature and the lowest battery discharge temperature T1, it is confirmed that T > the lowest battery discharge temperature T1;

[0111] (2) Based on the ambient temperature and the preset mapping table of ambient temperature and actual required power retention, obtain the actual required power retention SOCT corresponding to the ambient temperature value T, and record it;

[0112] (3) When SOC is much greater than SOCT: the range extender is started and the battery is working, but the range extender is not working; the battery is consumed until it is close to the SOCT value.

[0113] (4) When SOC is close to SOCT: Start the range extender. The range extender generates electricity at the optimal generator power and confirm that T > the minimum allowable temperature for battery charging T. 充电 At the same time, the battery is charged to 80% SOC using the charging power allowed at this temperature in the battery charging MAP (according to experimental verification, the battery has the best time efficiency and energy efficiency ratio when charged to 80%, and other preset power can also be selected). The range extender stops, and the battery continues to consume until it is close to the SOCT value.

[0114] (5) Based on the above (3) and (4), the SOC is guaranteed to be above the required SOCT, which ensures that the range extender can start smoothly at this temperature when the vehicle starts next time.

[0115] Step S3: When the ambient temperature T ≤ the minimum battery discharge temperature T1, the range extender starts under the following conditions:

[0116] (1) Based on the comparison between the ambient temperature sensor and the lowest battery discharge temperature T1, confirm that T≤T1, record T as T1 at this time, and preset =T1+Balance Y; and based on the ambient temperature and actual demand mapping table, record the actual demand reserve capacity SOCM corresponding to the lowest battery discharge temperature T1.

[0117] (2) The battery heating device heats the battery to T2;

[0118] (3) Start the generator range extender and run the engine at idle speed;

[0119] Step S4: Confirm the operating modes of the range extender and battery:

[0120] With the lowest permissible temperature T for battery charging 充电 Compare;

[0121] when > Minimum allowable temperature T for battery charging 充电 :

[0122] Compare the battery SOC with the actual required reserve capacity SOCM. If the SOC is much greater than SOCM, the battery can work. When the battery discharge power is much less than the total power required by the vehicle, both the battery and the range extender participate in the work. When the battery discharge power can meet the total power required by the vehicle, the battery works alone.

[0123] Comparing battery SOC with SOCM, if the SOC is close to SOCM, the battery does not operate. The range extender, based on the required power and the corresponding T under the charging SOC Map, will... 充电 The sum of power generated;

[0124] When the preset battery temperature T2 is less than or equal to the minimum allowable battery charging temperature T 充电 When the battery is not in operation, the range extender generates electricity based on the load power until the ambient temperature or the real-time battery temperature exceeds the minimum allowable charging temperature T. 充电 .

[0125] If the real-time battery temperature is greater than the minimum allowable charging temperature T... 充电 hour:

[0126] If the battery's SOC is much greater than the actual required retention capacity SOCM corresponding to the battery's lowest discharge temperature T1, then the battery is controlled to work. When the battery's discharge power is less than the total power required by the vehicle, both the battery and the range extender are controlled to work. When the battery's discharge power can meet the total power required by the vehicle, only the battery is controlled to work.

[0127] If the battery's SOC is close to the actual required reserve capacity SOCM corresponding to the battery's minimum discharge temperature T1, the battery is controlled to not work, and the range extender generates electricity based on the sum of the minimum power that the battery can charge and the load power.

[0128] Based on the above control logic, the battery charge can be guaranteed to be no less than 5000 CM at low temperatures, ensuring that the range extender can start at low temperatures.

[0129] It should also be noted that:

[0130] The battery can be replaced with other components, including rechargeable batteries and supercapacitors, to achieve the same objective of this invention.

[0131] In this embodiment, the battery is connected to a walking motor and a working motor. Other power-consuming components can be replaced to achieve the same purpose of the present invention.

[0132] The above control strategies are merely a basic description of the control method implementation process. Any simple modifications, equivalent changes, or alterations made to the above process based on the technical essence of this invention shall still fall within the scope of this technology.

[0133] This invention, based on the engine's starting power requirements at different temperatures and the battery's SOC discharge map, makes the preset SOC map more accurate.

[0134] This invention is based on the fact that the battery's reserved SOC is sufficient under different ambient temperatures to meet the power requirements for starting the engine, so as to ensure that the range extender can still start normally at low temperatures without a low-pressure starter.

[0135] The power generation control method for engineering machinery proposed in this invention confirms the working mode of the range extender and battery based on the actual required operating power and SOC charge / discharge map, and accelerates the battery heating up to the battery's comfort zone temperature.

[0136] Example 2:

[0137] This embodiment provides a precision control system for a range extender used in engineering machinery that is adapted to a low-temperature battery, including:

[0138] An ambient temperature sensor is used to collect the ambient temperature value of the battery.

[0139] Batteries are used to provide power for the load operation;

[0140] Range extenders are used to charge batteries or output power for load operations;

[0141] The controller is connected to the ambient temperature sensor, the battery, and the range extender, respectively, and is used to execute the control method as described in Example 1 based on the ambient temperature value.

[0142] Example 3:

[0143] This embodiment provides an engineering machinery, including a precision control system for a low-temperature battery adapted to a range extender for engineering machinery as described in Embodiment 2.

[0144] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0145] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. 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... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0146] 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 function specified in one or more boxes.

[0147] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0148] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for controlling a low temperature battery for a range extender of a construction machine, characterized by, Includes the following steps: Obtain a preset mapping table of ambient temperature and actual required reserve power; the mapping table of ambient temperature and actual required reserve power is used to represent the correlation between ambient temperature and the reserve power required to start the engine. Obtain the ambient temperature value T of the battery and compare the ambient temperature value T with the minimum discharge temperature of the battery; When the ambient temperature T is greater than the minimum discharge temperature of the battery, the actual required reserve capacity corresponding to the ambient temperature T is obtained according to the ambient temperature and the preset mapping table of ambient temperature and actual required reserve capacity; the range extender is controlled to make the battery's state of charge (SOC) greater than the actual required reserve capacity corresponding to the ambient temperature T. When the ambient temperature T is less than or equal to the minimum discharge temperature of the battery, the battery temperature is heated to a preset battery temperature, which is greater than or equal to the minimum discharge temperature of the battery. Based on the mapping table of the minimum discharge temperature of the battery, the preset ambient temperature, and the actual required reserve capacity, the actual required reserve capacity corresponding to the minimum discharge temperature of the battery is obtained. The range extender is controlled to make the battery's state of charge (SOC) greater than the actual required reserve capacity corresponding to the minimum discharge temperature of the battery. The method for establishing the preset ambient temperature and actual required power reserve mapping table includes: Obtain the engine start-up map and the battery discharge map; the engine start-up map is used to represent the correlation between ambient temperature and start-up power; the battery discharge map is used to represent the correlation between ambient temperature, power and state of charge (SOC) of the battery. Extract the starting power corresponding to each ambient temperature in the engine starting Map, obtain the SOC of the battery corresponding to the ambient temperature and starting power through the battery discharge Map as the minimum starting battery SOC1 for the corresponding ambient temperature, establish the correlation mapping relationship between ambient temperature and minimum starting battery SOC1, and form a mapping table between ambient temperature and minimum starting battery SOC1. Obtain the region and season where the battery is located, and determine the preset battery capacity X based on the region and season. In the mapping table between ambient temperature and minimum battery starting capacity SOC1, the minimum battery starting capacity SOC1 corresponding to each ambient temperature is added to the battery preset margin X to form the required reserve capacity SOC2 for starting the engine corresponding to each ambient temperature. The correlation mapping relationship between ambient temperature and the required reserve capacity SOC2 for starting the engine is established, and the mapping table between ambient temperature and actual required reserve capacity is obtained. Controlling the range extender to ensure the battery's state of charge (SOC) is greater than the actual required reserve capacity corresponding to the battery's minimum discharge temperature also includes: When the preset battery temperature T2 is less than or equal to the minimum allowable battery charging temperature T 充电 When the battery is not in operation, the range extender generates electricity based on the load power until the ambient temperature or the real-time battery temperature exceeds the minimum allowable charging temperature T. 充电 ; If the battery real-time temperature is greater than the minimum temperature T 充电 allowed for battery charging, If the battery's SOC is much greater than the actual required retention capacity SOCM corresponding to the battery's lowest discharge temperature T1, then the battery is controlled to work. When the battery's discharge power is much less than the total power required by the vehicle, both the battery and the range extender are controlled to work. When the battery's discharge power can meet the total power required by the vehicle, only the battery is controlled to work. If the battery's SOC is close to the actual required reserve capacity SOCM corresponding to the battery's minimum discharge temperature T1, the battery is controlled to not work, and the range extender generates electricity based on the sum of the minimum power that the battery can charge and the load power.

2. The range extender adapted low temperature battery control method of the construction machine according to claim 1, characterized by, Methods for determining the battery's preset margin X based on the battery's location and season include: Determine the ambient temperature range of the battery based on the region and season in which the battery is located; Based on the ambient temperature range of the battery and the engine start-up map, multiple BMS calibrations were performed based on theoretical data to obtain the battery preset margin X corresponding to the region and season where the battery is located.

3. The method according to claim 1, characterized by, Methods for heating the battery to a preset battery temperature include using a PTC electric heater to heat the battery.

4. The method according to claim 1, characterized by, The method further includes: When the ambient temperature is less than or equal to the battery's minimum discharge temperature T1, start the range extender and run it at idle speed. The minimum power that the battery can charge at the corresponding preset battery temperature is obtained, and the range extender is controlled to generate electricity at the sum of the minimum power that the battery can charge and the load power.

5. The method of claim 1, wherein the method further comprises: Controlling the range extender to ensure the battery's state of charge (SOC) is greater than the actual required charge level corresponding to the ambient temperature value T includes: When the battery's SOC is much greater than the actual required reserve capacity SOCT corresponding to the ambient temperature value T: the range extender is activated, the battery is controlled to work, and the range extender is not working. "Much greater than" is defined as: 10% or more greater than the comparison value; When the battery's SOC is close to the actual required reserve capacity SOCT corresponding to the ambient temperature value T: the range extender is started, the range extender is controlled to generate electricity at the optimal generator power, and the battery is fully charged until the SOC reaches the preset charging capacity, after which the range extender stops. The nearest neighbor is defined as being within 5% above or below the comparison value.

6. The range extender adapted low temperature battery control method of claim 5, wherein, The preset charging capacity is 80%.

7. The range extender adapted low temperature battery control method of claim 5, wherein, Controlling the range extender to ensure the battery's state of charge (SOC) is greater than the actual required reserve capacity corresponding to the battery's minimum discharge temperature includes: When the preset battery temperature T2 is greater than the minimum temperature T 充电 at which battery charging is allowed, If the battery's SOC is much greater than the actual required retention capacity SOCM corresponding to the battery's lowest discharge temperature T1, then the battery is controlled to work. When the battery's discharge power is much less than the total power required by the vehicle, both the battery and the range extender are controlled to work. When the battery's discharge power can meet the total power required by the vehicle, only the battery is controlled to work. If the battery's State of Charge (SOC) is close to the actual required reserve capacity (SOCM) corresponding to the battery's minimum discharge temperature (T1), the battery is controlled to not operate, and the range extender generates electricity based on the sum of the minimum charging power of the battery and the load power.

8. A precise control system for a range extender adapted to a low temperature battery for a construction machine, characterized in that, include: An ambient temperature sensor is used to collect the ambient temperature value of the battery. Batteries are used to provide power for the load operation; Range extenders are used to charge batteries or output power for load operations; The controller is connected to an ambient temperature sensor, a battery, and a range extender, respectively, and is used to execute the control method as described in any one of claims 1-7 based on the ambient temperature value.

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