Vehicle load management method and device based on power grid power balance and vehicle

Abstract

The invention relates to the technical field of vehicles, in particular to a vehicle load management method and device based on power grid power balance and a vehicle, and the method comprises the steps: obtaining the first state data of a low-voltage battery of a current vehicle and the second state data of a DCDC; calculating the available power supply power of the current vehicle based on the first state data and the second state data, and obtaining the total load power of the current vehicle; and calculating current power grid balance power based on the available power supply power of the current vehicle and the total load power, and managing load equipment of the vehicle based on the current power grid balance power. Therefore, the problems that in the prior art, a low-voltage load part switch of a vehicle cannot be intelligently adjusted, and unnecessary electric energy loss is likely to be generated are solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a vehicle load management method, device and vehicle based on power grid power balancing. Background Art

[0002] As the number of electric vehicles grows, low-voltage battery feeding of electric vehicles often occurs on the market, causing the vehicle to fail to start normally. The main reason for the low-voltage battery feeding is that new systems such as smart cockpits and smart vehicle control have added a lot of low-voltage electrical loads, such as head-up displays, smart voice and wireless charging. The static power consumption is much higher than that of traditional vehicles, resulting in reduced battery life.

[0003] In response to the power feeding problem, timed wake-up or monitoring the battery power to recharge the battery has become a mainstream technical solution, but there are still many defects. For example, if the DCDC (Direct Current to Direct Current Converter) failure causes the recharging timeout or the recharging current is low, the relevant controller still wakes up regularly and the timing controller needs to remain awake, which consumes a lot of electricity. In addition, timed wake-up recharging can easily cause overcharge and undercharge of the battery, which not only greatly reduces the battery life but also has the risk of lithium battery explosion caused by excessive recharging current.

[0004] Most current solutions are to prevent power feed by supplementing power when the battery power is low. Few consider reducing the power consumption of electrical loads from the source, or simply shut down some loads in batches based on the low battery power, and are unable to make real-time adjustments based on the specific situation of the vehicle. Summary of the invention

[0005] The present application provides a vehicle load management method, device and vehicle based on power grid power balancing to solve the problems that the prior art cannot intelligently adjust the switches of the low-voltage load components of the vehicle, which easily leads to unnecessary power loss.

[0006] The first aspect of the present application provides a vehicle load management method based on grid power balance, including the following steps: obtaining first state data of a low-voltage battery of the current vehicle and second state data of a DCDC; calculating the available power supply power of the current vehicle based on the first state data and the second state data, and obtaining the total load power of the current vehicle; calculating the current grid balance power based on the available power supply power and the total load power of the current vehicle, and managing the vehicle's load equipment based on the current grid balance power.

[0007] Optionally, in one embodiment of the present application, the vehicle's load equipment is managed based on the current grid balancing power, including: if the current grid balancing power is less than a first preset value and lasts for more than the preset time, determining the vehicle's initial load limitation level as the first level, shutting down the corresponding load equipment based on the priority of the load equipment and the first level, and recalculating the grid balancing power; if the recalculated grid balancing power is less than the first preset value, increasing the initial load limitation level to the second level, shutting down the corresponding load equipment based on the priority of the load equipment and the second level, iteratively calculating the grid balancing power and determining the load limitation level until the grid balancing power is greater than the second preset value or the load limitation level reaches the highest level.

[0008] Optionally, in one embodiment of the present application, the first state data includes at least one of temperature, SOC (State of Charge), voltage and current, and the second state data includes at least one of output current, output voltage and current limit. The available power supply power of the current vehicle is calculated based on the first state data and the second state data, including: obtaining the current target current of the low-voltage battery; calculating the target charging power of the low-voltage battery based on the target current and voltage; calculating the available power of the low-voltage battery based on the SOC temperature; calculating the available power of DCDC based on the output current, output voltage and current limit; calculating the available power supply power of the current vehicle based on the available power of DCDC and the available power of the low-voltage battery, or calculating the available power supply power of the current vehicle based on the available power of DCDC and the target charging power of the low-voltage battery.

[0009] Optionally, in one embodiment of the present application, before calculating the available power supply power of the current vehicle based on the available power of DCDC and the available power of the low-voltage battery, or calculating the available power supply power of the current vehicle based on the available power of DCDC and the target charging power of the low-voltage battery, it also includes: obtaining the SOC interval in which the current low-voltage battery is located, wherein the SOC interval includes a first interval and a second interval; if the SOC interval in which the current low-voltage battery is located is the first interval, then calculating the available power supply power of the current vehicle based on the available power of DCDC and the available power of the low-voltage battery; if the SOC interval in which the current low-voltage battery is located is the second interval, then calculating the available power supply power of the current vehicle based on the available power of DCDC and the target charging power.

[0010] Optionally, in one embodiment of the present application, after the grid balance power is greater than the second preset value or the load limit level reaches the highest level, it also includes: obtaining the current load limit level of the vehicle; if the current load limit level lasts for more than a preset time and the grid balance power is greater than the second preset value, the current load limit level is reduced by one level.

[0011] Optionally, in one embodiment of the present application, before obtaining the first status data of the current vehicle's low-voltage battery and the second status data of the DCDC, it also includes: obtaining the current operating mode of the vehicle; if the current operating mode is extreme energy-saving mode or transportation mode, the vehicle's load limit level is the highest level; if the current operating mode is car wash mode or factory mode, the vehicle's load limit level is the first level.

[0012] The second aspect of the present application provides a vehicle load management device based on grid power balance, including: an acquisition module, used to obtain the first state data of the current vehicle's low-voltage battery and the second state data of the DCDC; a first calculation module, used to calculate the current vehicle's available power supply power based on the first state data and the second state data, and obtain the current vehicle's total load power; a second calculation module, used to calculate the current grid balance power based on the current vehicle's available power supply power and total load power, and manage the vehicle's load equipment based on the current grid balance power.

[0013] Optionally, in one embodiment of the present application, the second calculation module is further used for: if the current grid balancing power is less than a first preset value and the duration exceeds the preset duration, then determining the initial load limitation level of the vehicle as the first level, shutting down the corresponding load device based on the priority of the load device and the first level, and recalculating the grid balancing power; if the recalculated grid balancing power is less than the first preset value, then increasing the initial load limitation level to the second level, shutting down the corresponding load device based on the priority of the load device and the second level, iteratively calculating the grid balancing power and determining the load limitation level until the grid balancing power is greater than the second preset value or the load limitation level reaches the highest level.

[0014] Optionally, in one embodiment of the present application, the first state data includes at least one of temperature, SOC, voltage and current, the second state data includes at least one of output current, output voltage and current limit, and the first calculation module is further used to: obtain the current target current of the low-voltage battery; calculate the target charging power of the low-voltage battery based on the target current and voltage; calculate the available power of the low-voltage battery based on the SOC and temperature; calculate the available power of DCDC based on the output current, output voltage and current limit; calculate the available power of the current vehicle based on the available power of DCDC and the available power of the low-voltage battery, or calculate the available power of the current vehicle based on the available power of DCDC and the target charging power of the low-voltage battery.

[0015] Optionally, in one embodiment of the present application, it also includes: a third calculation module, which is used to obtain the SOC interval in which the current low-voltage battery is located before calculating the available power of the current vehicle based on the available power of DCDC and the available power of the low-voltage battery, or calculating the available power of the current vehicle based on the available power of DCDC and the target charging power of the low-voltage battery, wherein the SOC interval includes a first interval and a second interval; if the SOC interval in which the current low-voltage battery is located is the first interval, the available power of the current vehicle is calculated based on the available power of DCDC and the available power of the low-voltage battery; if the SOC interval in which the current low-voltage battery is located is the second interval, the available power of the current vehicle is calculated based on the available power of DCDC and the target charging power.

[0016] Optionally, in one embodiment of the present application, it also includes: a downgrade module, which is used to obtain the current load limit level of the vehicle until the grid balance power is greater than a second preset value or the load limit level reaches the highest level; if the current load limit level lasts for more than a preset time and the grid balance power is greater than the second preset value, the current load limit level is reduced by one level.

[0017] Optionally, in one embodiment of the present application, it also includes: a first acquisition module, used to obtain the current operating mode of the vehicle before obtaining the first status data of the current vehicle's low-voltage battery and the second status data of the DCDC; if the current operating mode is extreme energy-saving mode or transportation mode, the vehicle's load limit level is the highest level; if the current operating mode is car wash mode or factory mode, the vehicle's load limit level is the first level.

[0018] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to perform a vehicle load management method based on grid power balancing as in the above-mentioned embodiment.

[0019] The fourth aspect of the present application provides a computer-readable storage medium having a computer program or instructions stored thereon, and the computer program or instructions are executed by a processor to perform a vehicle load management method based on grid power balancing as in the above-mentioned embodiment.

[0020] The fifth aspect of the present application provides a computer program product, including a computer program or instructions. When the computer program or instructions are executed, the vehicle load management method based on grid power balancing as in the above-mentioned embodiment is implemented.

[0021] Therefore, this application has at least the following beneficial effects:

[0022] The embodiment of the present application can calculate the available power of the current vehicle based on the first state data of the current low-voltage battery and the second state data of the DCDC, and calculate the current grid balance power based on the available power of the current vehicle and the total load power, and then manage the vehicle's load equipment based on the current grid balance power, intelligently adjust the vehicle's electrical load function, reduce power consumption, avoid battery feeding, increase vehicle endurance and do not affect the comfort load function experience. Therefore, the technical problems that the prior art cannot intelligently adjust the switches of the low-voltage load components of the vehicle, and easily generate unnecessary power loss, etc. are solved.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 A flow chart of a vehicle load management method based on power grid power balancing provided according to an embodiment of the present application;

[0026] Figure 2 A schematic diagram of an advanced load management system based on power grid power balancing provided according to an embodiment of the present application;

[0027] Figure 3 A specific flow chart of a vehicle load management method based on power grid power balancing provided according to an embodiment of the present application;

[0028] Figure 4 This is an example diagram of a vehicle load management device based on power grid power balancing provided according to an embodiment of the present application;

[0029] Figure 5 It is a schematic diagram of the structure of a vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0031] The following describes the vehicle load management method, device and vehicle based on power grid power balance of the embodiment of the present application with reference to the accompanying drawings. In view of the current solutions mentioned in the above background technology, most of them are to prevent power feeding by supplementing power when the battery power is low, and rarely consider reducing the power consumption of electrical loads from the source, or simply judge to directly shut down part of the load based on the low battery power, and cannot make real-time adjustments according to the specific situation of the vehicle. The present application provides a vehicle load management method based on power grid power balance, in which the available power supply power of the current vehicle can be calculated based on the first state data of the current low-voltage battery and the second state data of the DCDC, and the current power grid balance power can be calculated based on the available power supply power and the total load power of the current vehicle, and then the load equipment of the vehicle is managed based on the current power grid balance power, and the electrical load function of the vehicle is intelligently adjusted to reduce power consumption, avoid battery feeding, increase vehicle endurance and do not affect the comfort load function experience. Thus, the problem that the existing technology cannot intelligently adjust the switch of the low-voltage load component of the vehicle, and is prone to unnecessary power loss is solved.

[0032] Specifically, Figure 1 A flow chart of a vehicle load management method based on grid power balancing provided in an embodiment of the present application.

[0033] like Figure 1 As shown, the vehicle load management method based on power grid power balance includes the following steps:

[0034] In step S101, the first state data of the current vehicle low-voltage battery and the second state data of the DCDC are obtained.

[0035] Among them, the first state data includes at least one of temperature, SOC, voltage and current, which can be obtained by the vehicle's EBS and LBMS, and the second state data includes at least one of output current, output voltage and current limit, which can be obtained through the vehicle's CDU.

[0036] It should be noted that low-voltage batteries include storage batteries and lithium batteries, but the present application is only aimed at vehicles with only one type, that is, only storage batteries or lithium batteries.

[0037] In an embodiment of the present application, before obtaining the first state data of the current vehicle's low-voltage battery and the second state data of the DCDC, it also includes: obtaining the current operating mode of the vehicle; if the current operating mode is extreme energy-saving mode or transportation mode, the vehicle's load limit level is the highest level; if the current operating mode is car wash mode or factory mode, the vehicle's load limit level is the first level.

[0038] It can be understood that before the embodiment of the present application obtains the first state data of the current vehicle's low-voltage battery and the second state data of the DCDC, if the current operating mode of the vehicle is the extreme energy-saving mode or the transportation mode, it indicates that the vehicle consumes more power at this time, so the vehicle's load limit level is directly the highest level, reducing the vehicle's power consumption. If the current operating mode of the vehicle is the car wash mode or the factory mode, it indicates that the vehicle consumes less power at this time, so the vehicle's load limit level is directly limited to the lowest level, such as 0.

[0039] In step S102, the available power of the current vehicle is calculated based on the first state data and the second state data, and the total load power of the current vehicle is obtained.

[0040] Among them, the vehicle load refers to low-voltage loads such as blowers, seat heating and ventilation, fragrance systems, speakers and wireless charging. That is to say, the solution of the embodiment of the present application refers to only managing the low-voltage loads of the vehicle.

[0041] It can be understood that the embodiments of the present application can calculate the available power of the current vehicle based on the first state data and the second state data, and obtain the total load power of the current vehicle, so as to subsequently manage the load of the vehicle.

[0042] It should be noted that before using the first state data, the embodiment of the present application also performs filtering processing on the first state data, that is, performing RC low-pass filter processing on the low-voltage battery SOC, voltage and current signals to avoid filtering processing for short-term large-scale jumps of the signal, specifically:

[0043] The RC low-pass filter uses a first-order filtering algorithm, and its formula is as follows: Y(n) = α*X(n) + (1-α)Y(n-1), where α is the filtering coefficient, X(n) is the current sampling value, Y(n-1) is the previous filtering output value, and Y(n) is the current filtering output value. The α coefficient in the formula is the key. The smaller α is, the stronger the filtering effect is, the smoother the output curve is, and the smaller the deviation from the true value is;

[0044] The method for adjusting the filter coefficient α is as follows: First, U = IR, Q = It, and the derivative of C = Q / U is obtained.

[0045] δQ=CδU C ;

[0046]

[0047] Transformed into a difference equation:

[0048]

[0049] Get the filter coefficient According to the cut-off frequency formula The relationship between the low-pass filter coefficient α and the cutoff frequency fs is obtained Where U is voltage, I is current, R is impedance, T is filter calculation period, C is capacitance, Q is charge, and the cut-off frequency can be calculated from circuit elements and topology. Substitute the filter coefficient obtained by the formula into the low-pass filter, and first use CANoe to collect the SOC change curves of the battery and low-voltage lithium battery on a test bench with EBS / LBMS, and then use the CANape calibration tool to collect the SOC change curve in RAM, and observe whether the curve is smooth and close to the true value. You can fine-tune the parameters until the balance point is reached.

[0050] In an embodiment of the present application, the available power supply power of the current vehicle is calculated based on the first state data and the second state data, including: obtaining the target current of the current low-voltage battery; calculating the target charging power of the low-voltage battery based on the target current and voltage; calculating the available power of the low-voltage battery based on the SOC and temperature; calculating the available power of the DCDC based on the output current, output voltage and current limit; calculating the available power supply power of the current vehicle based on the available power of the DCDC and the available power of the low-voltage battery, or calculating the available power supply power of the current vehicle based on the available power of the DCDC and the target charging power of the low-voltage battery.

[0051] Among them, the target current is calculated by the SOC closed-loop algorithm.

[0052] It can be understood that the embodiments of the present application can calculate the target charging power of the low-voltage battery based on the current low-voltage battery target current and voltage, and the calculation formula is P=IU, and calculate the available power of the low-voltage battery based on SOC and temperature, calculate the available power of DCDC based on the output current, output voltage and current limit, and calculate the available power of the current vehicle based on the available power of DCDC and the available power of the low-voltage battery, or calculate the available power of the current vehicle based on the available power of DCDC and the target charging power.

[0053] Among them, the current limit value is obtained by the DCDC power limit value, and when the DCDC fails or the DCDC does not work, the DCDC available power is calculated as 0.

[0054] In an embodiment of the present application, before calculating the available power supply power of the current vehicle based on the available power of DCDC and the available power of the low-voltage battery, or calculating the available power supply power of the current vehicle based on the available power of DCDC and the target charging power of the low-voltage battery, it also includes: obtaining the SOC interval in which the current low-voltage battery is located, wherein the SOC interval includes a first interval and a second interval; if the SOC interval in which the current low-voltage battery is located is the first interval, then calculating the available power supply power of the current vehicle based on the available power of DCDC and the available power of the low-voltage battery; if the SOC interval in which the current low-voltage battery is located is the second interval, then calculating the available power supply power of the current vehicle based on the available power of DCDC and the target charging power.

[0055] Among them, the first interval is the high SOC interval, the second interval is the low SOC interval, the boundaries can be the SOC upper limit (80%) and the SOC lower limit (60%). When the battery SOC decreases and the value is lower than the lower limit, it switches to the low SOC interval management mode. When the SOC increases and the value is higher than the upper limit, it switches to the high SOC interval management mode.

[0056] It is understandable that, before calculating the available power of the current vehicle, the embodiment of the present application may determine the SOC interval in which the current low-voltage battery is located, and determine how to calculate the available power of the current vehicle according to the current SOC interval, specifically:

[0057] In the high SOC range, available power = DCDC available power + battery available power, and in the low SOC range, available power = DCDC available power - target charging power.

[0058] In step S103, the current grid balance power is calculated based on the available power source power and the total load power, and the load equipment of the vehicle is managed based on the current grid balance power.

[0059] Among them, the grid balance power = the available power supply power of the vehicle - the total load power. The electric balance power needs to be processed by the electric balance power filter to limit its time constant and input and output amplitude.

[0060] It can be understood that the embodiments of the present application can calculate the current grid balance power based on the current available power supply power and total load power of the vehicle, and manage the vehicle's load equipment based on the grid balance power, intelligently adjust the electrical load function, reduce power consumption, and avoid battery feeding of the vehicle.

[0061] In an embodiment of the present application, the load equipment of the vehicle is managed based on the current grid balancing power, including: if the current grid balancing power is less than a first preset value and lasts for more than the preset time, the initial load limitation level of the vehicle is determined to be the first level, and the corresponding load equipment is turned off based on the priority of the load equipment and the first level, and the grid balancing power is recalculated; if the recalculated grid balancing power is less than the first preset value, the initial load limitation level is increased to the second level, and the corresponding load equipment is turned off based on the priority of the load equipment and the second level, and the grid balancing power is iteratively calculated and the load limitation level is determined until the grid balancing power is greater than the second preset value or the load limitation level reaches the highest level.

[0062] Among them, the first preset value and the second preset value can be calibrated according to the specific situation, for example, the first preset value can be 0W, and the second preset value can be 180W; the preset time can be set according to the specific situation, such as 3min; the first level is the lowest level of load level, which is 0, and the highest level can be set according to the current load situation of the vehicle, such as 6.

[0063] It can be understood that the embodiments of the present application can determine the initial load limitation level of the vehicle to be the first level when the current grid balance power is less than the first preset value and the duration exceeds the preset duration, shut down the corresponding load device based on the priority of the load device and the first level, and recalculate the grid balance power. If the recalculated grid balance power is less than the first preset value, the initial load limitation level is increased to the second level, and shut down the corresponding load device based on the priority of the load device and the second level, and iterate the calculation of the grid balance power and the determination of the load limitation level until the grid balance power is greater than the second preset value or the load limitation level reaches the highest level.

[0064] It should be noted that the embodiment of the present application shuts down the corresponding load equipment based on the load limit level. Specifically, a power unit is established according to the gear or state of each load. Each power unit has attribute 1: load power, attribute 2: load first priority n (0-6), attribute 3: load second priority (0-60). The larger the value, the higher the priority. The calculation is performed through the comfort load opening state or the working gear to control the corresponding load power unit to be turned on or off.

[0065] For example, when the electric balancing power is less than the lower limit of the electric balancing power limit of 0W (the first preset value), and the continuous load limit is maintained for 3 minutes (the preset duration), the electric balancing power will be iteratively calculated starting from n=0: assuming that attribute 2 is closed: the load power unit with the first priority of 0-n, the electric balancing power is recalculated as the virtual electric balancing power. For example, when n=0, the corresponding load function of level 0 is turned off, and the total load power of 1-6 is calculated. Continue to accumulate n=1, turn off the level 0 and 1 functions, and calculate the total load power of 2-6, until n=6 (the highest level) or the virtual electric balancing power is greater than the upper limit of the electric balancing power of 180W (the second preset value).

[0066] In an embodiment of the present application, until the grid balance power is greater than the second preset value or the load limit level reaches the highest level, it also includes: obtaining the current load limit level of the vehicle; if the current load limit level lasts for more than the preset time, and the grid balance power is greater than the second preset value, the current load limit level is reduced by one level.

[0067] It can be understood that, in the embodiment of the present application, until the grid balance power is greater than the second preset value or the load limit level reaches the highest level, if the current load limit level lasts for more than the preset time and the grid balance power is greater than the second preset value, the current load limit level will be reduced by one level.

[0068] The following describes the vehicle load management method based on power grid power balancing in an embodiment of the present application through a specific embodiment.

[0069] Before describing the vehicle load management method based on power grid power balancing, let's first introduce the equipment in the vehicle involved in the method, that is, a load management system based on power grid power balancing, referred to as APC. Figure 2As shown, the system includes a battery or lithium battery low-voltage battery system, EBS (Electrical Battery Sensor), LBMS (Low Voltage Lithium Battery Management System), FLZCU (Front Left Zone Controller Unit), RZCU (Rear Zone Controller Unit), ICC (Information Computing Center), VCC (Vehicle Control Center, integrated with VCU vehicle controller), CDU (Charging and Discharging Distribution Unit, integrated with DCDC), and vehicle electrical loads; domain controllers such as ZCU (Zone Controller Unit) and VCC communicate through Ethernet, which has higher transmission efficiency, and Legacy ECU (Legacy Electronic Control Unit, downstream controller) such as EBS, LBMS and DCDC communicate through CAN\LIN.

[0070] Among them, EBS and LBMS are used to monitor the SOC, temperature, voltage and other status information of the battery and low-voltage lithium battery respectively, and transmit the information to RZCU;

[0071] FLZCU, used to send status information such as vehicle mode and car wash mode to RZCU;

[0072] RZCU is used to calculate the power limit level through power balance based on information such as battery, DCDC and load power, and intelligently adjust the switch state and switch level of electrical loads;

[0073] ICC, used to forward the extreme energy-saving mode signal to the RZCU and display the load limit instrument prompt on the central control screen;

[0074] DCDC is integrated in the CDU to monitor DCDC working status, DCDC output capacity, DCDC fault information, DCDC output voltage and other information;

[0075] VCC, used to forward DCDC information and send power limit signals to RZCU;

[0076] The vehicle electrical load refers to low-voltage loads such as blowers, seat heating and ventilation, fragrance systems, speakers and wireless charging, which execute the shutdown or startup function after receiving different load limit levels.

[0077] Combination Figure 2 Describe the vehicle load management method based on grid power balancing, the process is as follows Figure 3 As shown, it includes grid power balancing strategy and special mode processing.

[0078] The power grid power balance strategy involves input signal filtering, SOC interval management, load power unit design, power balance calculation and APC level decision, including the following steps:

[0079] Step S1, input signal filtering processing means that the low-voltage battery SOC, voltage and current signals monitored by the EBS / LBMS need to be processed by an RC low-pass filter to avoid short-term large-scale signal jumps;

[0080] The RC low-pass filter uses a first-order filtering algorithm, and its formula is as follows: Y(n) = α*X(n) + (1-α)Y(n-1), where α is the filtering coefficient, X(n) is the current sampling value, Y(n-1) is the previous filtering output value, and Y(n) is the current filtering output value. The α coefficient in the formula is the key. The smaller α is, the stronger the filtering effect and the smoother the output curve. If it is too small, it will deviate from the true value.

[0081] The method for adjusting the filter coefficient α is as follows: First, U = IR, Q = It, and the derivative of C = Q / U is obtained.

[0082] δQ=CδU C ;

[0083]

[0084]

[0085] Transformed into a difference equation:

[0086]

[0087] Get the filter coefficient According to the cut-off frequency formula The relationship between the low-pass filter coefficient α and the cutoff frequency fs is obtained Where U is voltage, I is current, R is impedance, T is filter calculation period, C is capacitance, Q is charge, and the cut-off frequency can be calculated from circuit elements and topology. Substitute the filter coefficient obtained by the formula into the low-pass filter, first collect the SOC change curves of the battery and low-voltage lithium battery through CANoe on a test bench with EBS / LBMS, and then collect the SOC change curve in RAM through the CANape calibration tool to observe whether the curve is smooth and close to the true value. The parameters can be fine-tuned until the balance point is reached.

[0088] Step S2, SOC interval management means that the APC function adopts different control strategies according to the different intervals of the low-voltage battery and the lithium battery power. There are two SOC intervals, namely the high SOC interval and the low SOC interval, whose boundaries are the APC battery SOC upper limit (80%) and the APC battery SOC lower limit (60%). When the battery SOC decreases and the value is lower than the lower limit, it switches to the low SOC interval management mode. When the SOC increases and the value is higher than the upper limit, it switches to the high SOC interval management mode.

[0089] Step S3, load power unit design means to establish a power unit according to the gear or state of each load, each power unit has attribute 1: load power, attribute 2: load first priority n (0-6), attribute 3: load second priority (0-60), the larger the value, the higher the priority, and the calculation is performed through the comfort load opening state or working gear to control the corresponding load power unit to be turned on or off;

[0090] Step S4, power balance calculation is to calculate the available power supply power and the total load power according to the battery, DCDC and load information to obtain the grid balance power. The specific steps are as follows:

[0091] (1) First, the battery management system calculates the battery available power according to the low-voltage battery SOC and temperature, and limits the calculated battery available power. The value should be between the upper and lower limits of the low-voltage battery charge and discharge current and the product of the low-voltage battery voltage. When the low-voltage battery sensor fails or the lithium battery management system fails or the communication is lost, the battery available power is calculated to be 0;

[0092] (2) According to the current low-voltage battery target current and the actual battery voltage, the battery target charging power is calculated by P = IU. The battery target current is calculated by the SOC closed-loop compensation algorithm;

[0093] (3) Calculating the DCDC available power according to the DCDC output current, the current limit and the current DCDC output voltage. When the DCDC fails or the DCDC does not work, the DCDC available power is calculated as 0;

[0094] (4) Calculate the available power according to the following logic: in the high SOC range, available power = DCDC available power + battery available power; in the low SOC range, available power = DCDC available power - target charging power;

[0095] (5) Add the attribute 1: load power of all enabled load power units to obtain the total load power;

[0096] (6) Calculate the current grid balance power in real time: balance power = available power - total load power. The balance power needs to be processed by a balance power filter to limit its time constant and input and output amplitude.

[0097] Step S5, APC level decision means that when the electric balance power is less than the lower limit of the electric balance power limit 0W, and the continuous load limit is maintained for 3min, the APC function will iteratively calculate the electric balance power from n=0: Assume that attribute 2 is turned off: the load power unit with the first priority of 0-n, recalculate the electric balance power as the virtual electric balance power, for example, when n=0, turn off the load function corresponding to level 0, calculate the total load power of 1-6, continue to accumulate n=1, turn off the level 0 and 1 functions, and calculate the total load power of 2-6, until n=6 or the virtual electric balance power is greater than the upper limit of the electric balance power 180W;

[0098] Step S6, set the APC power limit level n and send it to the vehicle network. The APC power limit level should remain unchanged within the load limit holding time of 3 minutes. If the electric balance power is greater than the upper limit of the electric balance power of 180W and the load limit holding time is continuous for 3 minutes, the APC limit level is reduced by 1 level;

[0099] Step S7, special mode processing means that when in extreme energy saving mode or the vehicle mode is transport mode, APC no longer calculates power balance and directly sends the highest APC limit level 6; when in car wash mode or the vehicle mode is factory mode, the lowest APC limit level 0 is directly sent;

[0100] Step S8: The vehicle electrical load shall shut down or limit the corresponding function or limit its own power according to the APC power limit level and continue to send the comfort load on state and working gear position signal to the RZCU. After the user forcibly turns on the function, it is not subject to the APC power limit.

[0101] In summary, the load limit level is calculated through grid power balance and then the electrical load function is intelligently adjusted to reduce power consumption and avoid battery feeding. By fine-tuning the load opening and closing, the control accuracy is accurate to a single load and graded adjustment is achieved, which not only reduces energy consumption and increases battery life, but also does not affect the comfort load function experience.

[0102] According to the vehicle load management method based on grid power balance proposed in the embodiment of the present application, the available power of the current vehicle can be calculated based on the first state data of the current low-voltage battery and the second state data of the DCDC, and the current grid balance power can be calculated based on the current available power of the vehicle and the total load power, and then the vehicle's load equipment can be managed based on the current grid balance power, and the vehicle's electrical load function can be intelligently adjusted to reduce power consumption, avoid battery feeding, and increase vehicle endurance without affecting the comfort load function experience.

[0103] Next, a vehicle load management device based on power grid power balancing proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0104] Figure 4 It is a block diagram of a vehicle load management device based on power grid power balancing according to an embodiment of the present application.

[0105] like Figure 4 As shown, the vehicle load management device 10 based on power grid power balance includes: an acquisition module 100 , a first calculation module 200 and a second calculation module 300 .

[0106] Among them, the acquisition module 100 is used to obtain the first state data of the current vehicle's low-voltage battery and the second state data of the DCDC; the first calculation module 200 is used to calculate the available power supply power of the current vehicle based on the first state data and the second state data, and obtain the total load power of the current vehicle; the second calculation module 300 is used to calculate the current grid balance power based on the current vehicle's available power supply power and total load power, and manage the vehicle's load equipment based on the current grid balance power.

[0107] In an embodiment of the present application, the second calculation module is further used for: if the current grid balance power is less than a first preset value and the duration exceeds the preset duration, then determining the initial load limit level of the vehicle as the first level, shutting down the corresponding load device based on the priority of the load device and the first level, and recalculating the grid balance power; if the recalculated grid balance power is less than the first preset value, then increasing the initial load limit level to the second level, shutting down the corresponding load device based on the priority of the load device and the second level, iteratively calculating the grid balance power and determining the load limit level until the grid balance power is greater than the second preset value or the load limit level reaches the highest level.

[0108] In an embodiment of the present application, the first state data includes at least one of temperature, SOC, voltage and current, the second state data includes at least one of output current, output voltage and current limit, and the first calculation module 200 is further used to: obtain the current target current of the low-voltage battery; calculate the target charging power of the low-voltage battery based on the target current and voltage; calculate the available power of the low-voltage battery based on the SOC and temperature; calculate the available power of DCDC based on the output current, output voltage and current limit; calculate the available power of the current vehicle based on the available power of DCDC and the available power of the low-voltage battery, or calculate the available power of the current vehicle based on the available power of DCDC and the target charging power of the low-voltage battery.

[0109] In the embodiment of the present application, the device 10 of the embodiment of the present application further includes: a third calculation module.

[0110] Among them, the third calculation module is used to obtain the SOC interval of the current low-voltage battery before calculating the available power of the current vehicle based on the available power of DCDC and the available power of the low-voltage battery, or calculating the available power of the current vehicle based on the available power of DCDC and the target charging power of the low-voltage battery, wherein the SOC interval includes a first interval and a second interval; if the SOC interval of the current low-voltage battery is the first interval, the available power of the current vehicle is calculated based on the available power of DCDC and the available power of the low-voltage battery; if the SOC interval of the current low-voltage battery is the second interval, the available power of the current vehicle is calculated based on the available power of DCDC and the target charging power.

[0111] In the embodiment of the present application, the device 10 of the embodiment of the present application further includes: a degradation module.

[0112] Among them, the downgrade module is used to obtain the current load limit level of the vehicle until the grid balance power is greater than the second preset value or the load limit level reaches the highest level; if the current load limit level lasts for more than the preset time and the grid balance power is greater than the second preset value, the current load limit level is reduced by one level.

[0113] In the embodiment of the present application, the device 10 of the embodiment of the present application further includes: a first acquisition module.

[0114] Among them, the first acquisition module is used to obtain the current operating mode of the vehicle before obtaining the first status data of the current vehicle's low-voltage battery and the second status data of the DCDC; if the current operating mode is the extreme energy-saving mode or the transportation mode, the vehicle's load limit level is the highest level; if the current operating mode is the car wash mode or the factory mode, the vehicle's load limit level is the first level.

[0115] It should be noted that the aforementioned explanation of the embodiment of the vehicle load management method based on power grid power balancing is also applicable to the vehicle load management device based on power grid power balancing of this embodiment, and will not be repeated here.

[0116] According to the vehicle load management device based on grid power balance proposed in the embodiment of the present application, the available power of the current vehicle can be calculated based on the first state data of the current low-voltage battery and the second state data of the DCDC, and the current grid balance power can be calculated based on the current available power of the vehicle and the total load power, and then the vehicle's load equipment can be managed based on the current grid balance power, and the vehicle's electrical load function can be intelligently adjusted to reduce power consumption, avoid battery feeding, and increase vehicle endurance without affecting the comfort load function experience.

[0117] Figure 5 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The electronic device may include:

[0118] A memory 501 , a processor 502 , and a computer program stored in the memory 501 and executable on the processor 502 .

[0119] When the processor 502 executes the program, the vehicle load management method based on power grid power balancing provided in the above embodiment is implemented.

[0120] Furthermore, the vehicle also includes:

[0121] The communication interface 503 is used for communication between the memory 501 and the processor 502 .

[0122] The memory 501 is used to store computer programs that can be executed on the processor 502 .

[0123] The memory 501 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0124] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0125] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can communicate with each other through an internal interface.

[0126] The processor 502 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0127] An embodiment of the present application also provides a computer-readable storage medium having a computer program or instructions stored thereon. When the computer program or instructions are executed by a processor, the vehicle load management method based on grid power balancing as described above is implemented.

[0128] An embodiment of the present application also provides a computer program product, including a computer program or instructions, which, when executed, implements the above-mentioned vehicle load management method based on grid power balancing.

[0129] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0130] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0131] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0132] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0133] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. A vehicle load management method based on power grid power balance, characterized in that: The following steps are involved: Acquire the first state data of the current vehicle low-voltage battery and the second state data of the DCDC; Calculating the available power of the current vehicle based on the first state data and the second state data, and acquiring the total load power of the current vehicle; The current grid balance power is calculated based on the current available power source power of the vehicle and the total load power, and the load equipment of the vehicle is managed based on the current grid balance power.

2. The vehicle load management method based on power grid power balance according to claim 1, characterized in that: The managing the load device of the vehicle based on the current grid balanced power includes: If the current grid balance power is less than a first preset value and the duration exceeds the preset duration, the initial load limit level of the vehicle is determined to be the first level, the corresponding load device is turned off based on the priority of the load device and the first level, and the grid balance power is recalculated; If the recalculated grid balancing power is less than the first preset value, the initial load limitation level is increased to the second level, and the corresponding load device is shut down based on the priority of the load device and the second level, and the grid balancing power is iteratively calculated and the load limitation level is determined until the grid balancing power is greater than the second preset value or the load limitation level reaches the highest level.

3. The vehicle load management method based on power grid power balance according to claim 1, characterized in that: The first state data includes at least one of temperature, SOC, voltage and current, the second state data includes at least one of output current, output voltage and current limit, and the current available power of the vehicle is calculated based on the first state data and the second state data, including: Get the current target current of the low-voltage battery; calculating a target charging power of the low-voltage battery based on the target current and the voltage; calculating available power of the low-voltage battery based on the SOC and the temperature; Calculate the available power of the DCDC based on the output current, the output voltage and the current limit; The available power of the current vehicle is calculated based on the available power of the DCDC and the available power of the low-voltage battery, or the available power of the current vehicle is calculated based on the available power of the DCDC and the target charging power of the low-voltage battery.

4. The vehicle load management method based on power grid power balance according to claim 3 is characterized in that: Before calculating the available power source power of the current vehicle based on the available power of the DCDC and the available power of the low-voltage battery, or before calculating the available power source power of the current vehicle based on the available power of the DCDC and the target charging power, the method further includes: Acquire the SOC interval of the current low-voltage battery, wherein the SOC interval includes a first interval and a second interval; If the SOC interval of the current low-voltage battery is the first interval, calculating the available power of the current vehicle based on the available power of the DCDC and the available power of the low-voltage battery; If the SOC interval of the current low-voltage battery is the second interval, the available power of the current vehicle is calculated based on the available power of the DCDC and the target charging power.

5. The vehicle load management method based on power grid power balance according to claim 2, characterized in that: After the grid balance power is greater than a second preset value or the load limit level reaches a maximum level, the method further includes: Obtaining a current load limit level of the vehicle; If the duration of the current load limit level exceeds the preset duration and the grid balance power is greater than the second preset value, the current load limit level is reduced by one level.

6. The vehicle load management method based on power grid power balance according to claim 1, characterized in that: Before obtaining the first state data of the current vehicle low-voltage battery and the second state data of the DCDC, it also includes: Obtaining a current operating mode of the vehicle; If the current operating mode is the extreme energy-saving mode or the transportation mode, the load limit level of the vehicle is the highest level; If the current operating mode is the car wash mode or the factory mode, the load limit level of the vehicle is the first level.

7. A vehicle load management device based on power grid power balance, characterized in that: include: An acquisition module, used to acquire the first state data of the current vehicle low-voltage battery and the second state data of the DCDC; A first calculation module, used for calculating the available power of the current vehicle based on the first state data and the second state data, and obtaining the total load power of the current vehicle; The second calculation module is used to calculate the current grid balance power based on the current available power source power of the vehicle and the total load power, and manage the load equipment of the vehicle based on the current grid balance power.

8. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle load management method based on grid power balancing as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: The computer program or instruction is executed by a processor to implement the vehicle load management method based on power grid power balancing as described in any one of claims 1 to 6.

10. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed, the vehicle load management method based on power grid power balancing as described in any one of claims 1 to 6 is implemented.

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