Method and system for correcting electric quantity displayed by electric automobile instrument

Abstract

The invention relates to the technical field of automobile control, in particular to a method and a system for correcting electric quantity displayed by an electric automobile instrument. Comprising the steps that after a vehicle is powered on, whether a current real electric quantity value needs to be corrected or not is judged based on vehicle standing time, and a real electric quantity correction value is obtained; calculating a power-on state display electric quantity correction value based on the real electric quantity correction value and the current dischargeable capacity of the battery; judging whether the power-on state display electric quantity needs to be corrected or not based on the power-on state display electric quantity correction value and the display electric quantity value, and displaying the power-on state display electric quantity correction value when correction is needed; and after the vehicle is under high voltage, calculating a high-voltage state display electric quantity correction value based on the current real electric quantity value, and updating according to the calculated high-voltage state display electric quantity correction value in real time. The method for correcting the electric quantity displayed by the electric automobile instrument is very simple, the electric quantity display precision can be greatly improved, and the driving feeling of a user is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile control, and in particular to a method and system for correcting the electric quantity displayed on an instrument of an electric vehicle. Background Art

[0002] For electric vehicles, in order to reflect the battery power in real time without affecting the user experience, the BMS generally has the real battery power and the meter display power. The real power is used to reflect the real state of the battery in real time, and the meter display power changes with the real power in combination with the user experience, and is usually proportional to the cruising range.

[0003] Since the real battery power reflects the real state of the battery in real time, it will jump under certain specific working conditions (such as static correction, temperature or SOH causing the available capacity to decrease). At this time, since the meter display power is based on the user experience and is directly proportional to the cruising range, it cannot jump immediately with the real power, which leads to a large difference between the meter display power and the real battery power. Especially when the actual battery power is low, resulting in limited or even impossible driving of the vehicle, while the meter display power is normal and even the cruising range is normal, this situation seriously affects the user experience and is prone to complaints when it occurs frequently.

[0004] In order to solve this technical problem, a Chinese invention patent application entitled "A method for adjusting the display of power" with patent number "CN113968140B" proposes a method for adjusting the display of power, which includes the following steps: determining whether to start the power display adjustment based on the difference between the actual power value of the battery at the current moment and the displayed power value at the previous moment; when the power display adjustment is started, determining the correction method of the displayed power value based on the change value of the actual power value within the first preset display cycle; according to the correction method of the displayed power value, using at least one of the displayed power value at the previous moment, the actual power value at the current moment and the target power to determine the correction amount, and using the correction amount to correct the displayed power value until the actual power value is the target power value, the displayed power value is within the target power allowable display range. This method can periodically adjust the displayed power value by comparing the actual power value with the displayed power value at the previous moment, so as to obtain a more accurate display value, which can indeed solve the problem that the displayed value cannot represent the real power value to a certain extent. However, this solution also has some problems. The method does not mention under which working conditions the displayed power value is controlled. After the power battery is powered on, the high-voltage working condition and the power supply working condition actually correspond to different usage conditions. If the displayed power value is controlled according to the above method, the result obtained is inaccurate. At the same time, the above method adopts a periodic adjustment method. Although it can make the displayed power value closer to the actual power value to a certain extent, the periodic control will cause the displayed power value to jump continuously, which will still seriously affect the user experience. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a method and system for correcting the amount of electricity displayed on an electric vehicle instrument.

[0006] The technical solution of the present invention is: a method for correcting the amount of electricity displayed on an electric vehicle instrument, comprising:

[0007] After the vehicle is powered on, it is determined whether the current real power value needs to be corrected based on the vehicle's static time, and the real power correction value is obtained when correction is required;

[0008] Obtain the current battery discharge capacity based on the current battery temperature;

[0009] Calculate the power correction value displayed in the power-on state based on the actual power correction value and the current battery discharge capacity;

[0010] Based on the power-on status displayed power correction value and the displayed power value, it is determined whether the power-on status displayed power needs to be corrected, and if correction is required, the power-on status displayed power correction value is displayed;

[0011] After the vehicle is powered on, the high-voltage state power display correction value is calculated based on the current real power value, and the high-voltage state power display correction value is updated in real time according to the calculated high-voltage state power display correction value.

[0012] According to a method for correcting the power displayed on an electric vehicle instrument provided by the present application, the method for judging whether the current real power value needs to be corrected based on the vehicle's static time includes: when the vehicle's static time is not less than the set static time, judging that the current real power value needs to be corrected, otherwise the current real power value does not need to be corrected.

[0013] According to a method for correcting the power displayed on an electric vehicle instrument provided in the present application, the method for obtaining a real power correction value when correction is required includes: correcting the real power based on the current battery temperature and the OCV-SoC curve at the corresponding temperature to obtain the real power correction value.

[0014] According to a method for correcting the electric quantity displayed on an electric vehicle instrument provided by the present application, the method for calculating the correction value of the electric quantity displayed on the power-on state based on the real electric quantity correction value and the current dischargeable capacity of the battery comprises: calculating the correction value of the electric quantity displayed on the power-on state according to the following formula:

[0015] SOC d1 =(SOC f *SOH*Cap0) / (a*Cap temp )*100%

[0016] Among them: SOC d1 ——Power-on status displays the power correction value;

[0017] SOC f ——Correction value of real power;

[0018] SOH – State of Health;

[0019] Cap0——standard battery discharge capacity;

[0020] Cap temp ——Current battery discharge capacity;

[0021] a——mapping coefficient.

[0022] According to a method for correcting the electric power displayed on an electric vehicle instrument provided by the present application, the method for judging whether the electric power displayed on the power-on state needs to be corrected based on the correction value of the electric power displayed on the power-on state and the displayed electric power value comprises:

[0023] If the power-on status display power correction value is less than the first threshold and the difference between the current display power and the power-on status display power correction value is not less than the second threshold, it is determined that the power-on status display power needs to be corrected for this power-on;

[0024] Otherwise, there is no need to correct the power level displayed in the power-on status.

[0025] According to a method for correcting the electric quantity displayed on an electric vehicle instrument provided by the present application, the method for calculating a correction value of the electric quantity displayed in a high-voltage state based on the current real electric quantity value after the vehicle is high-voltage, comprises: calculating the correction value of the electric quantity displayed in a high-voltage state according to the following formula:

[0026] SOC d2 =(SOC t *SOH*Cap0) / (a*Cap temp )*100%

[0027] Among them: SOC d2 ——High voltage state displays the power correction value;

[0028] SOC t ——Real power value;

[0029] SOH – State of Health;

[0030] Cap0——standard battery discharge capacity;

[0031] Cap temp ——Current battery discharge capacity;

[0032] a——mapping coefficient.

[0033] According to a method for correcting the displayed power of an electric vehicle instrument provided by the present application, the method for updating the displayed power in real time according to the calculated high-voltage state displayed power correction value includes: calculating the high-voltage state displayed power deviation based on the current displayed power value and the high-voltage state displayed power correction value; determining the actual working condition of the high-voltage state, determining the displayed power change rate based on the relationship between the current displayed power value and the high-voltage state displayed power correction value and the high-voltage state displayed power deviation, and adjusting the displayed power value according to the determined change rate.

[0034] According to a method for correcting the electric quantity displayed on an electric vehicle instrument provided by the present application, in a charging condition, if the current displayed electric quantity value is greater than the correction value of the electric quantity displayed in a high-voltage state, the change rate of the electric quantity displayed in a corresponding high-voltage state deviation is selected according to a first adjustment method to adjust the displayed electric quantity value upward; if the current displayed electric quantity value is less than the correction value of the electric quantity displayed in a high-voltage state, the change rate of the electric quantity displayed in a corresponding high-voltage state deviation is selected according to a second adjustment method to adjust the displayed electric quantity value upward;

[0035] During the discharge condition, if the current displayed power value is greater than the high-voltage state displayed power correction value, the displayed power value is adjusted downward by selecting the change rate of the corresponding high-voltage state displayed power deviation according to the third adjustment method; if the current displayed power value is less than the high-voltage state displayed power correction value, the displayed power value is adjusted downward by selecting the change rate of the corresponding high-voltage state displayed power deviation according to the fourth adjustment method.

[0036] The present application also provides an electric vehicle instrument display power correction system, the system operates according to the above-mentioned electric vehicle instrument display power correction method, including:

[0037] A state determination module, the state determination module is used to determine whether the current vehicle is in a power-on state or a high-voltage state;

[0038] a first real correction value acquisition module, which determines whether the current real power value needs to be corrected based on the vehicle's static time, and acquires the real power correction value when correction is needed;

[0039] A discharge capacity acquisition module, wherein the discharge capacity acquisition module acquires the current dischargeable capacity of the battery based on the current battery temperature;

[0040] A first display correction value acquisition module, which calculates a power-on state display power correction value based on the real power correction value and the current battery dischargeable capacity;

[0041] A power-on state correction module, the power-on state correction module is used to determine whether the power-on state displayed power needs to be corrected based on the power-on state displayed power correction value and the displayed power value when the vehicle is in a powered-on state, and display the power-on state displayed power correction value when correction is required;

[0042] A high-voltage correction module is used to calculate a high-voltage state display power correction value based on the current real power value when the vehicle is in a high-voltage state, and update the high-voltage state display power correction value in real time according to the calculated high-voltage state display power correction value.

[0043] According to an electric vehicle instrument display power correction system provided by the present application, the first real correction value acquisition module includes:

[0044] A rest time judgment module, wherein the rest time judgment module is used to judge that the current real power value needs to be corrected when the rest time of the vehicle is not less than the set rest time, and otherwise judge that the current real power value does not need to be corrected;

[0045] A real power correction value acquisition module, wherein the real power correction value acquisition module corrects the real power based on the current battery temperature and the OCV-SoC curve at the corresponding temperature to obtain the real power correction value.

[0046] According to an electric vehicle instrument display power correction system provided by the present application, the first display correction value acquisition module is used to calculate the power display power correction value of the power-on state according to the following formula:

[0047] SOC d1 =(SOC f *SOH*Cap0) / (a*Cap temp )*100%

[0048] Among them: SOC d1 ——Power-on status displays the power correction value;

[0049] SOC f ——Correction value of real power;

[0050] SOH – State of Health;

[0051] Cap0——standard battery discharge capacity;

[0052] Cap temp ——Current battery discharge capacity;

[0053] a——mapping coefficient.

[0054] According to an electric vehicle instrument display power correction system provided by the present application, the high-voltage correction module includes:

[0055] The second display correction value acquisition module calculates the high voltage state display power correction value according to the following formula:

[0056] SOC d2 =(SOC t *SOH*Cap0) / (a*Cap temp )*100%

[0057] Among them: SOC d2 ——High voltage state displays the power correction value;

[0058] SOC t ——Real power value;

[0059] SOH – State of Health;

[0060] Cap0——standard battery discharge capacity;

[0061] Cap temp——Current battery discharge capacity;

[0062] a——mapping coefficient.

[0063] According to an electric vehicle instrument display power correction system provided by the present application, the high-voltage correction module includes:

[0064] A charging condition adjustment module, the charging condition adjustment module is used to select a change rate of a corresponding high-voltage state display power deviation according to a first adjustment method to increase the displayed power value when the current displayed power value is greater than the high-voltage state display power correction value, and to select a change rate of a corresponding high-voltage state display power deviation according to a second adjustment method to increase the displayed power value when the current displayed power value is less than the high-voltage state display power correction value;

[0065] A discharge condition adjustment module, wherein the discharge condition adjustment module is used to select a change rate of a corresponding high-voltage state display power deviation according to a third adjustment method to adjust the displayed power value downward when the current displayed power value is greater than the high-voltage state display power correction value, and to select a change rate of a corresponding high-voltage state display power deviation according to a fourth adjustment method to adjust the displayed power value downward when the current displayed power value is less than the high-voltage state display power correction value.

[0066] The advantages of the present application are as follows: 1. The present application can correct different displayed power values ​​according to different working states, and the correction of the displayed power value is more accurate. In particular, the correction of the displayed power value after the power-on state can accurately determine whether the displayed power value needs to be corrected after the vehicle is powered on. The displayed power value is determined completely according to the actual power, and there will be no frequent jumps in the displayed power value, which will not cause trouble to the driver and passengers; the overall control correction method is very simple, the calculation amount is small, and it has great promotion value;

[0067] 2. After power-on, this application needs to determine whether the actual power value needs to be corrected by the static time, so as to obtain a more accurate real power value, facilitate subsequent judgment based on the real power value, and make the correction of the displayed power more accurate, avoiding the power error problem caused by the vehicle being static for too long;

[0068] 3. The method for obtaining the real power correction value in this application is very simple. The real power correction value can be obtained by querying the OCV-SoC curve at the current temperature and the corresponding temperature. The operation is very simple, and the obtained real power correction value can truly reflect the current battery situation;

[0069] 4. The method for obtaining the power-on status display power correction value of the present application is very simple. By constructing a formula to calculate the power-on status display power correction value, the accurate power-on status display power correction value can be determined based on the real power correction value, the battery health status, and the battery dischargeable capacity. The operation is simple and the calculation result is accurate.

[0070] 5. After obtaining the power-on state display power correction value, the present application further determines whether the displayed power value needs to be corrected, so as to avoid frequent jump problems caused by correcting the displayed power correction value when the power-on state power value is close to the power-on state display power correction value, and further provide more appropriate power display for drivers and passengers;

[0071] 6. The method for obtaining the displayed power correction value under high voltage state in this application is very simple. By constructing a formula, the displayed power correction value under high voltage state can be quickly obtained based on the true power value, battery health status and dischargeable capacity. The operation is simple and the displayed power correction value under high voltage state can be accurately obtained, which is convenient for subsequent operations.

[0072] 7. Under high voltage, the present application will gradually adjust the power display value according to the current power display value and the power correction value displayed under high voltage, and the adjustment is also carried out according to the actual working condition under high voltage, and the adjustment process is completely in line with the battery working condition;

[0073] 8. This application designs different display power adjustment methods for charging and discharging conditions. The entire adjustment is more in line with the actual working conditions of the power battery. The displayed power value can be gradually adjusted until it meets the high-voltage state display power correction value. The adjustment method is simple and easy to use;

[0074] 9. The present application also constructs an electric vehicle instrument display power correction system. The electric vehicle instrument display power correction system of the present application can be integrated into the control system of the vehicle to automatically correct and adjust the displayed power value, which can greatly improve the displayed power accuracy without affecting the user experience.

[0075] The electric vehicle instrument display power correction method of the present application is very simple, and can greatly improve the accuracy of the displayed power, reflect the current available battery power in real time, improve the accuracy of the estimated cruising range, and enhance the user's driving experience; at the same time, it adopts power-off correction and power-on dynamic adjustment of the following rate to improve the accuracy of the displayed power while ensuring that the user experience is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 : Schematic diagram of the electric vehicle instrument display power correction of the present application (power-on state);

[0077] Figure 2: Schematic diagram of the electric vehicle instrument display power correction of the present application (high voltage state). DETAILED DESCRIPTION

[0078] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with 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 invention, and should not be construed as limiting the present invention.

[0079] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0080] 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0081] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0082] The present application relates to a method for correcting the displayed power value of an electric vehicle instrument. The present application is mainly used to correct the displayed power value of an electric vehicle instrument in order to obtain a more accurate displayed power value, thereby improving the user's driving experience. The present application performs real-time corrections for different operating conditions of the power battery. The correction method for the displayed power value of the power battery under each operating condition is different. The correction is completely based on the operating characteristics of the power battery under the operating condition, and the correction of the displayed power value is more accurate. Moreover, the displayed power value of the correction method of the present application is completely determined based on the actual power, and there will be no frequent jumps in the displayed power value, which will not cause trouble to the driver and passengers; the overall control correction method is very simple and the calculation amount is small.

[0083] Specifically, Figures 1-2 As shown, a method for correcting the electric quantity displayed on an electric vehicle instrument of the present application comprises the following steps:

[0084] S1. Determine the state of the vehicle to determine whether the vehicle is in a power-on state or a high-voltage state;

[0085] The judgment of the vehicle status is very simple. You only need to judge the voltage status of the power battery and other equipment to get whether the vehicle is currently in the power-on state or the high-voltage state;

[0086] S2. After the vehicle is powered on, it is determined whether the current real power value needs to be corrected based on the vehicle's static time, and the real power correction value is obtained when correction is required;

[0087] If the vehicle is stationary for a long time, it will introduce errors in the actual power value after the vehicle is powered on;

[0088] S21, obtaining the current dischargeable capacity of the battery based on the current battery temperature;

[0089] Obtaining the current battery discharge capacity is convenient for further correction calculations;

[0090] S22, calculating a power-on status display power correction value based on the actual power correction value and the current battery discharge capacity;

[0091] At this time, the power-on state display power correction value can be obtained, and the current displayed power value can be corrected based on the power-on state display power correction value;

[0092] S23, judging whether the power-on state displayed power quantity needs to be corrected based on the power-on state displayed power quantity correction value and the displayed power quantity value, and displaying the power-on state displayed power quantity correction value when correction is needed;

[0093] For user experience considerations, try to avoid power-on display jumps and adjust the rate to keep up with the times during use. However, when the battery is low, the difference is large. If it is not updated in time, it may cause poor user experience (for example, early speed limit, early power off). In this case, consider correcting the displayed power.

[0094] S3, after the vehicle is high-voltage, a correction value of the power displayed in the high-voltage state is calculated based on the current real power value, and the power displayed in the high-voltage state is updated in real time according to the calculated correction value;

[0095] After the vehicle is powered on, there are two situations: one is that the vehicle is in a charging condition, and the other is that the vehicle is in a discharging condition. The high voltage on the vehicle and the power on the vehicle are two different states, and different countermeasures need to be taken.

[0096] In some embodiments, this embodiment optimizes the above-mentioned method of judging whether the current real power value needs to be corrected based on the vehicle's static time. Specifically, when the vehicle's static time is not less than the set static time, it is judged that the current real power value needs to be corrected, otherwise the current real power value does not need to be corrected.

[0097] The setting of the standing time is based on the characteristics of the vehicle's power battery and can be set to 2 hours. In actual application, it is not limited to this value range and can be set and selected according to the actual situation as long as the needs are met.

[0098] When the vehicle's rest time is not less than the set rest time, it is considered that the current vehicle rest time is too long, which will introduce some errors to the actual power value. Of course, the error in the actual power value is mainly caused by the calculation error of the algorithm during use.

[0099] The specific correction method is: based on the current battery temperature and the OCV-SOC curve at the corresponding temperature, correct the real power to obtain the real power correction value. The OCV-SOC curve is obtained by calibration. The calibration test is carried out on the power battery, and the relationship between OCV-SOC at different temperatures is collected to construct the OCV-SOC curve. The constructed OCV-SOC curve is stored in the control system and can be called when needed. In actual use, the current power battery temperature is collected, and then the corresponding power value is found in the OCV-SOC curve based on the temperature, which is the required real power correction value.

[0100] In some other embodiments of the present application, the present embodiment optimizes the above step S22, and the method for calculating the power-on state display power correction value based on the real power correction value and the current battery discharge capacity is as follows: the power-on state display power correction value is calculated according to the following formula, SOC d1 =(SOC f *SOH*Cap0) / (a*Cap temp )*100%

[0101] Among them: SOC d1 ——Power-on status displays the power correction value;

[0102] SOC f ——Correction value of real power;

[0103] SOH - battery health status, estimated by battery full discharge capacity, usage time, etc.;

[0104] Cap0——dischargeable capacity of standard battery, characteristic of power battery, can be obtained according to the factory specifications of power battery;

[0105] Cap temp ——The current discharge capacity of the battery, obtained through capacity tests at different temperatures;

[0106] a——mapping coefficient, the ratio of the real power to the displayed power. For example, if the real power is 5% to 95% and the displayed power is 0 to 100%, the mapping relationship is 100 / 90=10 / 9;

[0107] If the real power value does not need to be corrected, the power correction value displayed in the power-on state can be calculated by using the above formula and then replacing the above real power correction value with the real power value.

[0108] After obtaining the power-on status display power correction value, it is not necessarily necessary to correct the currently displayed power value. It may not be necessary to correct it. Therefore, after obtaining the power-on status display power correction value, it is necessary to further determine whether correction is required. Specifically, the method for determining whether the power-on status display power needs to be corrected based on the power-on status display power correction value and the displayed power value is: if the power-on status display power correction value is less than the first threshold A and the difference between the current displayed power and the power-on status display power correction value is not less than the second threshold B, then it is determined that the power-on status display power needs to be corrected for this power-on; otherwise, the power-on status display power does not need to be corrected. The first threshold A is greater than the second threshold B.

[0109] The first threshold value A and the second threshold value B are set based on factors such as vehicle power demand, high-voltage accessory consumption, and battery temperature rise rate. In actual application, the first threshold value A can be set to 20% and the second threshold value B to 10%.

[0110] When actually controlling Figure 1 As shown, after the vehicle is powered on, when the vehicle static time is not less than the set static time, it is determined that the current real power value needs to be corrected, otherwise the current real power value does not need to be corrected; if the current real power value needs to be corrected, the real power is corrected based on the current battery temperature and the OCV-SOC curve at the corresponding temperature to obtain the real power correction value; the method for judging whether the power displayed in the power state needs to be corrected based on the power-on status display power correction value and the displayed power value is: if the power-on status display power correction value is less than the first threshold A and the difference between the current displayed power and the power-on status display power correction value is not less than the second threshold B, it is determined that the power-on status display power needs to be corrected for this power-on; otherwise, the power displayed in the power state does not need to be corrected; if correction is required, the power-on status display power correction value is displayed, if correction is not required, the current power-on status display power value can be directly maintained.

[0111] In a further embodiment of the present application, the present embodiment optimizes the above step S3. After the vehicle is high pressure, as shown in FIG. Figure 2 As shown, no matter it is charging condition or discharging condition, the following method can be used to calculate the high-voltage state display power correction value. Specifically, the method for calculating the high-voltage state display power correction value based on the current real power value after the vehicle is high-voltage is: calculate the high-voltage state display power correction value according to the following formula,

[0112] SOC d2 =(SOC t *SOH*Cap0) / (a*Cap temp )*100%

[0113] Among them: SOC d2 ——High voltage state displays the power correction value;

[0114] SOC t ——Real power value;

[0115] SOH - battery health status, estimated by battery full discharge capacity, usage time, etc.;

[0116] Cap0——dischargeable capacity of standard battery, characteristic of power battery, can be obtained according to the factory specifications of power battery;

[0117] Cap temp ——The current discharge capacity of the battery, obtained through capacity tests at different temperatures;

[0118] a——mapping coefficient, the ratio of the actual power to the displayed power.

[0119] After obtaining the high-voltage state display power correction value, it is necessary to make corrections and adjustments according to the specific conditions of the vehicle. For charging conditions, the display power value can only increase and not decrease. For discharging conditions, the display power value can only decrease and not increase. The display power correction of this embodiment is adjusted according to the high-voltage state display power deviation. The high-voltage state display power deviation = |high-voltage state display power value-high-voltage state display power correction value| / high-voltage state display power correction value*100%.

[0120] In the charging condition, if the current displayed power value is greater than the high-voltage state displayed power correction value, the displayed power value is adjusted upward by selecting the change rate of the corresponding high-voltage state displayed power deviation according to the first adjustment method. The first adjustment method of this embodiment is shown in Table 1:

[0121] Table 1: The first adjustment method under charging conditions

[0122]

[0123]

[0124] If the current displayed power value is less than the high-voltage state displayed power correction value, the displayed power value is adjusted upward by selecting the change rate of the corresponding high-voltage state displayed power deviation according to the second adjustment method. The second adjustment method of this embodiment is shown in Table 2:

[0125] Table 2: Second adjustment method under charging conditions

[0126]

[0127] In the discharge condition, if the current displayed power value is greater than the high-voltage state displayed power correction value, the displayed power value is adjusted downward by selecting the change rate of the corresponding high-voltage state displayed power deviation according to the third adjustment method. The third adjustment method of this embodiment is shown in Table 3:

[0128] Table 3: The third adjustment method under discharge conditions

[0129]

[0130] If the current displayed power value is less than the high-voltage state displayed power correction value, the displayed power value is adjusted downward by selecting the change rate of the corresponding high-voltage state displayed power deviation according to the fourth adjustment method. The fourth adjustment method of this embodiment is shown in Table 4:

[0131] Table 4: The fourth adjustment method under discharge conditions

[0132]

[0133] For charging conditions, the power display value can only rise. Therefore, when the current displayed power value is greater than the high-voltage state display power correction value, it proves that the power display value at this time is too high. In this case, the change rate is set to be smaller so that the power display value rises slowly at a slower speed until it matches the high-voltage state display power correction value. When the current displayed power value is less than the high-voltage state display power correction value, it proves that the current displayed power value is too small and the power display value needs to be quickly increased. The set change rate is larger so that the power display value rises at a faster speed until it matches the high-voltage state display power correction value.

[0134] For discharge conditions, the displayed power value can only decrease. Therefore, when the current displayed power value is greater than the high-voltage state displayed power correction value, it proves that the displayed power value at this time is too high. In this case, a larger change rate is set to make the displayed power value decrease at a faster rate until it matches the high-voltage state displayed power correction value. When the current displayed power value is less than the high-voltage state displayed power correction value, it proves that the current displayed power value is too low. The displayed power value needs to be slowly reduced. The set change rate is smaller, so that the displayed power value decreases at a faster rate until it matches the high-voltage state displayed power correction value.

[0135] The present application also provides an electric vehicle instrument display power correction system, including a state determination module, a first real correction value acquisition module, a discharge capacity acquisition module, a first display correction value acquisition module, a power-on state correction module and a high-voltage correction module, wherein the state determination module is used to determine whether the current vehicle is in a power-on state or a high-voltage state; the first real correction value acquisition module determines whether it is necessary to correct the current real power value based on the vehicle static time, and obtains the real power correction value when correction is required; the discharge capacity acquisition module obtains the current battery dischargeable capacity based on the current battery temperature; the first display correction value acquisition module calculates the power-on state display power correction value based on the real power correction value and the current battery dischargeable capacity; the power-on state correction module is used to determine whether it is necessary to correct the power displayed in the power-on state based on the power-on state display power correction value and the display power value when the vehicle is in a power-on state, and displays the power displayed in the power-on state correction value when correction is required; the high-voltage correction module is used to calculate the high-voltage state display power correction value based on the current real power value when the vehicle is in a high-voltage state, and update it in real time according to the calculated high-voltage state display power correction value.

[0136] Among them, the first real correction value acquisition module includes a standing time judgment module and a real power correction value acquisition module. The standing time judgment module is used to make a judgment that the current real power value needs to be corrected when the vehicle standing time is not less than the set standing time, otherwise it is used to make a judgment that the current real power value does not need to be corrected; the real power correction value acquisition module: corrects the real power based on the current battery temperature and the OCV-SoC curve at the corresponding temperature to obtain the real power correction value.

[0137] The first display correction value acquisition module is used to calculate the power correction value displayed in the power-on state according to the following formula:

[0138] SOC d1 =(SOC f *SOH*Cap0) / (a*Cap temp )*100%

[0139] Among them: SOC d1 ——Display the power correction value;

[0140] SOC f ——Correction value of real power;

[0141] SOH – State of Health;

[0142] Cap0——standard battery discharge capacity;

[0143] Cap temp ——Current battery discharge capacity;

[0144] a——mapping coefficient.

[0145] The high voltage correction module includes a second display correction value acquisition module, which calculates the high voltage state display power correction value according to the following formula:

[0146] SOC d2 =(SOC t *SOH*Cap0) / (a*Cap temp )*100%

[0147] Among them: SOC d2 ——High voltage state displays the power correction value;

[0148] SOC t ——Real power value;

[0149] SOH – State of Health;

[0150] Cap0——standard battery discharge capacity;

[0151] Cap temp ——Current battery discharge capacity;

[0152] a——mapping coefficient.

[0153] The high-voltage correction module includes a charging condition adjustment module and a discharging condition adjustment module. The charging condition adjustment module is used to select the corresponding high-voltage state display power deviation change rate according to the first adjustment method to increase the displayed power value when the current displayed power value is greater than the high-voltage state display power correction value, and select the corresponding high-voltage state display power deviation change rate according to the second adjustment method to increase the displayed power value when the current displayed power value is less than the high-voltage state display power correction value; the discharging condition adjustment module is used to select the corresponding high-voltage state display power deviation change rate according to the third adjustment method to decrease the displayed power value when the current displayed power value is greater than the high-voltage state display power correction value, and select the corresponding high-voltage state display power deviation change rate according to the fourth adjustment method to decrease the displayed power value when the current displayed power value is less than the high-voltage state display power correction value.

[0154] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for correcting the amount of electricity displayed on an electric vehicle instrument, characterized in that: include, After the vehicle is powered on, it is determined whether the current real power value needs to be corrected based on the vehicle's static time, and the real power correction value is obtained when correction is required; Obtain the current battery discharge capacity based on the current battery temperature; Calculate the power correction value displayed in the power-on state based on the actual power correction value and the current battery discharge capacity; Based on the power-on status displayed power correction value and the displayed power value, it is determined whether the power-on status displayed power needs to be corrected, and if correction is required, the power-on status displayed power correction value is displayed; After the vehicle is powered on, the high-voltage state power display correction value is calculated based on the current real power value, and the high-voltage state power display correction value is updated in real time according to the calculated high-voltage state power display correction value.

2. A method for correcting the electric vehicle instrument display power as claimed in claim 1, characterized in that: The method for judging whether the current real power value needs to be corrected based on the vehicle static time includes: when the vehicle static time is not less than the set static time, judging that the current real power value needs to be corrected, otherwise the current real power value does not need to be corrected.

3. A method for correcting the electric vehicle instrument display power as claimed in claim 1, characterized in that: The method for obtaining a real power correction value when correction is required includes: correcting the real power based on the current battery temperature and the OCV-SoC curve at the corresponding temperature to obtain the real power correction value.

4. A method for correcting the electric vehicle instrument display power as claimed in claim 1, characterized in that: The method for calculating the power-on state display power correction value based on the real power correction value and the current battery dischargeable capacity includes: calculating the power-on state display power correction value according to the following formula: SOC d1 =(SOC f *SOH*Cap0) / (a*Cap temp )*100% Among them: SOC d1 ——Power-on status displays the power correction value; SOC f ——Correction value of real power; SOH – State of Health; Cap0——standard battery discharge capacity; Cap temp ——Current battery discharge capacity; a——mapping coefficient.

5. The electric vehicle instrument display power correction method according to claim 1, characterized in that: The method for judging whether the power-on state displayed power quantity needs to be corrected based on the power-on state displayed power quantity correction value and the displayed power quantity value comprises: If the power-on status display power correction value is less than the first threshold and the difference between the current display power and the power-on status display power correction value is not less than the second threshold, it is determined that the power-on status display power needs to be corrected for this power-on; Otherwise, there is no need to correct the power level displayed in the power-on status.

6. A method for correcting the electric vehicle instrument display power as claimed in claim 1, characterized in that: The method for calculating the high-voltage state display power correction value based on the current real power value after the vehicle is high-voltage, comprises: calculating the high-voltage state display power correction value according to the following formula: SOC d2 =(SOC t *SOH*Cap0) / (a*Cap temp )*100% Among them: SOC d2 ——High voltage state displays the power correction value; SOC t ——Real power value; SOH – State of Health; Cap0——standard battery discharge capacity; Cap temp ——Current battery discharge capacity; a——mapping coefficient.

7. The electric vehicle instrument display power correction method according to claim 1, characterized in that: The method for updating the high-voltage state displayed power correction value in real time according to the calculated value includes: calculating the high-voltage state displayed power deviation based on the current displayed power value and the high-voltage state displayed power correction value; determining the actual working condition of the high-voltage state, determining the displayed power change rate based on the relationship between the current displayed power value and the high-voltage state displayed power correction value and the high-voltage state displayed power deviation, and adjusting the displayed power value according to the determined change rate.

8. A method for correcting the electric vehicle instrument display power as claimed in claim 7, characterized in that: In the charging condition, if the current displayed power value is greater than the high-voltage state displayed power correction value, the displayed power value is adjusted upward by selecting the change rate of the corresponding high-voltage state displayed power deviation according to the first adjustment method; if the current displayed power value is less than the high-voltage state displayed power correction value, the displayed power value is adjusted upward by selecting the change rate of the corresponding high-voltage state displayed power deviation according to the second adjustment method; During the discharge condition, if the current displayed power value is greater than the high-voltage state displayed power correction value, the displayed power value is adjusted downward by selecting the change rate of the corresponding high-voltage state displayed power deviation according to the third adjustment method; if the current displayed power value is less than the high-voltage state displayed power correction value, the displayed power value is adjusted downward by selecting the change rate of the corresponding high-voltage state displayed power deviation according to the fourth adjustment method.

9. An electric vehicle instrument display power correction system, characterized in that: The system operates according to a method for correcting the electric vehicle instrument display power as claimed in any one of claims 1 to 8, including: A state determination module, the state determination module is used to determine whether the current vehicle is in a power-on state or a high-voltage state; a first real correction value acquisition module, which determines whether the current real power value needs to be corrected based on the vehicle's static time, and acquires the real power correction value when correction is needed; A discharge capacity acquisition module, wherein the discharge capacity acquisition module acquires the current dischargeable capacity of the battery based on the current battery temperature; A first display correction value acquisition module, which calculates a power-on state display power correction value based on the real power correction value and the current battery dischargeable capacity; A power-on state correction module, the power-on state correction module is used to determine whether the power-on state displayed power needs to be corrected based on the power-on state displayed power correction value and the displayed power value when the vehicle is in a powered-on state, and display the power-on state displayed power correction value when correction is required; A high-voltage correction module is used to calculate a high-voltage state display power correction value based on the current real power value when the vehicle is in a high-voltage state, and update the high-voltage state display power correction value in real time according to the calculated high-voltage state display power correction value.

10. An electric vehicle instrument display power correction system as claimed in claim 9, characterized in that: The first display correction value acquisition module is used to calculate the power-on state display power correction value according to the following formula: SOC d1 =(SOC f *SOH*Cap0) / (a*Cap temp )*100% Among them: SOC d1 ——Power-on status displays the power correction value; SOC f ——Correction value of real power; SOH – State of Health; Cap0——standard battery discharge capacity; Cap temp ——Current battery discharge capacity; a——mapping coefficient.

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