CN113514767A - SOC estimation system and estimation method for power battery of fuel cell vehicle - Google Patents
SOC estimation system and estimation method for power battery of fuel cell vehicle Download PDFInfo
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- CN113514767A CN113514767A CN202110819337.5A CN202110819337A CN113514767A CN 113514767 A CN113514767 A CN 113514767A CN 202110819337 A CN202110819337 A CN 202110819337A CN 113514767 A CN113514767 A CN 113514767A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
Abstract
The invention relates to the technical field of fuel cell automobile control methods, in particular to a system and a method for estimating the SOC of a power cell of a fuel cell automobile. The system comprises a data acquisition module, a data processing module and a data processing module, wherein the data acquisition module is used for acquiring the current initial value and the voltage initial value of each high-voltage component under the current condition of a vehicle; the correction module is used for correcting the current initial value and the voltage initial value of the power battery through the collected current initial value and voltage initial value of the high-voltage assembly to obtain a power battery current correction value and a power battery voltage correction value; and the estimation module is used for estimating the SOC value of the power battery according to the current correction value and the voltage correction value of the power battery. The invention can avoid abnormal shutdown purging or abnormal power boosting of the fuel cell system caused by poor SOC precision, improve the dynamic property and the economical efficiency of the whole vehicle, reduce the hydrogen consumption, reduce the risk of over-discharge or over-charge of the power battery, reduce the safety risk of a user and provide better experience for the user.
Description
Technical Field
The invention relates to the technical field of fuel cell automobile control methods, in particular to a system and a method for estimating the SOC of a power cell of a fuel cell automobile.
Background
The SOC estimation of the battery of the existing pure electric vehicle or the hybrid electric vehicle combining the internal combustion engine and the power battery only can be estimated by collecting the voltage and the current of the power battery during charging or discharging by a voltage and current sensor of the power battery pack when the power battery is charged or discharged.
The fuel cell automobile is affected by the characteristics of difficult cold start, slow loading, incapability of storing energy and the like of the fuel cell, and the power source of the fuel cell automobile at the present stage is an electric-electric mixed mode taking a fuel cell system as a main part and a power cell as an auxiliary part. The SOC estimation value of the power battery has great influence on the output power of the fuel battery system, and the SOC estimation scheme of the power battery of the existing pure electric vehicle or the hybrid electric vehicle combining an internal combustion engine and the power battery is still adopted at present.
Under the electric-electric mixed mode of the fuel cell automobile, the power cell and the fuel cell are in the same high-voltage framework, and the state of the power cell has great influence on a fuel cell system. If the voltage or current sensor of the power battery is not accurate enough or fails, the SOC value of the power battery cannot be estimated accurately, and the inaccurate SOC information has a great influence on the output power of the fuel battery system, so that the dynamic performance, the economic performance and even the safety of the fuel battery automobile are influenced. If the vehicle is in a normal running state, the electric quantity of the power battery is enough, and the fuel battery system is not needed to charge the power battery at the moment, but because the SOC estimation value of the power battery is low, the fuel battery system can increase the output power to charge the power battery, so that the energy loss is caused, the economy of the whole vehicle is not favorable, and even the overcharging of the power battery occurs, so that the potential safety hazard is brought; if the electric quantity of the power battery is low, the fuel cell system is required to boost power to charge the power battery, but the SOC estimated value of the power battery is high, and the power battery is not boosted by the fuel cell system to charge the power battery, so that the power battery is over-discharged, and the next time the fuel cell system cannot be started normally.
Disclosure of Invention
The present invention aims to solve the above-mentioned drawbacks of the background art, and provides a system and a method for estimating the SOC of a power battery of a fuel cell vehicle.
The technical scheme of the invention is as follows: a fuel cell vehicle power battery SOC estimation system comprises,
the data acquisition module is used for acquiring the initial current value and the initial voltage value of each high-voltage component under the current condition of the vehicle;
the correction module is used for correcting the current initial value and the voltage initial value of the power battery through the collected current initial value and voltage initial value of the high-voltage assembly to obtain a power battery current correction value and a power battery voltage correction value;
and the estimation module is used for estimating the SOC value of the power battery according to the current correction value and the voltage correction value of the power battery.
Further said correction module comprises a correction module for correcting said correction signal,
the average value acquisition module is used for calculating a current average value and a voltage average value according to the collected current initial value and voltage initial value of the high-voltage component;
and the threshold comparison module is used for comparing the absolute value of the difference between the current average value and the current initial value of the power battery with a set current threshold, selecting the current average value or the current initial value of the power battery as a power battery current correction value according to the comparison result, comparing the absolute value of the difference between the voltage average value and the voltage initial value of the power battery with a set voltage threshold, and selecting the voltage average value or the voltage initial value of the power battery as the power battery voltage correction value according to the comparison result.
Further the average value obtaining module comprises a module for obtaining an average value,
and the current average value acquisition module is used for calculating a current average value according to the current initial value of the power battery under the current vehicle condition and the current initial value of the high-voltage component except the power battery.
Further the average value obtaining module comprises a module for obtaining an average value,
and the voltage average value acquisition module is used for calculating a voltage average value according to the number of the high-voltage components in the working state under the current vehicle condition and respective voltage initial values.
An estimation method of a fuel cell automobile power battery SOC estimation system comprises the steps of judging a vehicle state according to vehicle information, obtaining a current initial value and a voltage initial value of a high-voltage component in a working state in a vehicle based on the vehicle state, correcting the current initial value and the voltage initial value of a power battery through the current initial value and the voltage initial value of the high-voltage component to obtain a current correction value and a voltage correction value of the power battery, and estimating the power battery SOC value based on the current correction value and the voltage correction value.
The method for correcting the initial current value of the power battery through the initial current value of the high-voltage component further comprises the following steps of: the method comprises the steps of obtaining a current initial value of a high-voltage component of a vehicle in the current state, calculating a current average value, comparing a current difference absolute value of the current average value and the current initial value of a power battery with a set current threshold value, taking the current average value as a current correction value of the power battery if the current difference absolute value is larger than the set current threshold value, and taking the current initial value of the power battery as the current correction value of the power battery if the current difference absolute value is not larger than the set current threshold value.
The method for correcting the initial voltage value of the power battery through the initial voltage value of the high-voltage component comprises the following steps: the method comprises the steps of obtaining a voltage initial value of a high-voltage component in the current state of the vehicle, calculating a voltage average value, comparing the voltage average value with a voltage difference absolute value of the power battery voltage initial value with a set voltage threshold value, taking the voltage average value as a power battery voltage correction value if the voltage difference absolute value is larger than the set voltage threshold value, and taking the power battery current initial value as the power battery voltage correction value if the voltage difference absolute value is not larger than the set voltage threshold value.
Further, the method for calculating the average value of the current comprises the following steps: the method comprises the steps of obtaining a current initial value of a power battery and a high-voltage current initial value of a high-voltage component except the power battery under the current condition of the vehicle, wherein the average value of the current initial value of the power battery and the high-voltage current initial value is a current average value.
Further, the method for calculating the voltage average value comprises the following steps: the method comprises the steps of obtaining the number of high-voltage components in the working state and respective voltage initial values under the current condition of the vehicle, wherein the ratio of the sum of the voltage initial values to the number of the high-voltage components in the working state is a voltage average value.
Further the high voltage assembly comprises a power battery, a fuel cell, an electric motor and an in-vehicle voltage platform DCDC.
The set current threshold is further 1A to 3A.
The set voltage threshold is further 2V to 4V.
According to the invention, the current value and the voltage value which can truly reflect the running state of the power battery are obtained by correcting the current and the voltage of the power battery, then the calculated SOC value of the power battery is more accurate than the SOC value of the power battery which is directly obtained through the current and the voltage value of the power battery, the current condition of the power battery can be reflected more truly, abnormal shutdown blowing or abnormal power pulling caused by poor SOC precision is avoided, the power performance and the economical efficiency of the whole vehicle are improved, the hydrogen consumption is reduced, the risk of over-discharge or over-charge of the power battery is reduced, the safety risk of a user is reduced, and better experience is provided for the user;
according to the invention, the current value and the voltage value of the high-voltage component in the working state under the current condition of the vehicle are collected, and the current value and the voltage value of the power battery are corrected based on the current value and the voltage value of the high-voltage component except the power battery, so that the accurate current correction value and voltage correction value which can truly reflect the condition of the power battery of the vehicle can be obtained, and finally, the accurate SOC value of the power battery can be obtained.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The following reference examples are illustrative and are intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, are used merely for convenience in describing and simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered as limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The present invention will be described in further detail with reference to specific examples.
The embodiment protects a method for estimating the SOC of a power battery of a fuel cell automobile, which is characterized in that the method corrects the collected current initial value and voltage initial value of the power battery through the current initial value and voltage initial value of a high-voltage component on the automobile to obtain a power battery current correction value and a power battery voltage correction value, and then estimates the SOC of the power battery through the power battery current correction value and the power battery voltage correction value, wherein the estimation system comprises the following modules:
the system comprises a data acquisition module, a data acquisition module and an in-vehicle voltage platform DCDC, wherein the data acquisition module is used for acquiring current initial values and voltage initial values of all high-voltage components under the current condition of a vehicle, the high-voltage components of the embodiment comprise a power battery, a fuel battery, a motor and an in-vehicle voltage platform DCDC, the voltage initial values and the current initial values of the power battery are obtained by reading voltage and current message information of a power battery controller, the voltage initial values and the current initial values of the fuel battery are obtained by reading output voltage and current message information of a fuel battery system controller, the voltage initial values and the current initial values of the motor are obtained by reading input voltage and current message information of the motor controller, and the voltage initial values and the current initial values of the in-vehicle voltage platform DCDC are obtained by reading DCDC input voltage and current message information;
the correction module is used for correcting the current initial value and the voltage initial value of the power battery through the collected current initial value and voltage initial value of the high-voltage component to obtain a power battery current correction value and a power battery voltage correction value, and specifically comprises an average value acquisition module which is used for calculating a current average value and a voltage average value according to the collected current initial value and voltage initial value of the high-voltage component; the threshold comparison module is used for comparing the absolute value of the difference between the current average value and the current initial value of the power battery with a set current threshold, selecting the current average value or the current initial value of the power battery as a current correction value of the power battery according to the comparison result, comparing the absolute value of the difference between the voltage average value and the voltage initial value of the power battery with a set voltage threshold, and selecting the voltage average value or the voltage initial value of the power battery as a voltage correction value of the power battery according to the comparison result;
and the estimation module is used for estimating the SOC value of the power battery according to the current correction value and the voltage correction value of the power battery.
The specific control method is as follows: firstly, the vehicle state is judged according to the vehicle information, the vehicle state comprises the vehicle starting (the vehicle is internally provided with a high-voltage component to operate) or not starting (the vehicle is internally provided with the high-voltage component not to operate), and the operation condition of the vehicle internal high-voltage component can be divided into the following conditions:
1. the vehicle is not started, high-voltage components in the vehicle do not work, a whole vehicle high-voltage network is not communicated, and the current correction value of the power battery is the initial value A of the current of the power battery at the momentout＝ABatteryThe corrected value of the voltage of the power battery is the initial value V of the voltage of the power batteryout＝VBattery；
2. Starting the vehicle, not starting the fuel cell system, idling the vehicle, operating the power battery, and not operating the fuel cell and the motorAlthough the internal voltage platform DCDC works, the reference significance to the whole network voltage and current is not great, so that the current correction value of the power battery is the initial value A of the power battery current at the momentout＝ABatteryThe corrected value of the voltage of the power battery is the initial value V of the voltage of the power batteryout＝VBattery；
3. If the vehicle is started, the fuel cell system is not started, and the vehicle is in a braking energy recovery state, namely the power battery, the motor and the voltage platform DCDC in the vehicle are all in working states, the fuel cell is not in working, and the working components have certain reference significance to the voltage and the current of the whole network; at the moment, the vehicle carries out braking energy recovery, the motor charges the power battery, and the operation is calculated according to the following steps:
1) calculating the average voltage value of the input ends of the power battery, the motor and the voltage platform DCDC in the vehicle,
wherein:
-a voltage average value;
VBattery-a power cell voltage initial value;
VMotor-a motor voltage initial value;
VDC-an in-vehicle voltage platform DCDC voltage initial value;
2) calculating the average value of the difference value between the current initial value of the power battery and the current initial values of other high-voltage components in the high-voltage network, namely calculating the current average value,
wherein:
-electricityLeveling average value;
ABattery-a power cell current initial value;
AMotor-an initial value of the motor current;
ADC-an in-vehicle current platform DCDC current initial value;
at the moment, the initial value of the current of the motor is a negative value, the initial value of the current platform DCDC in the vehicle is a positive value, the initial value of the current of the power battery is a negative value, the sum of the initial value of the current of the motor and the initial value of the current platform DCDC in the vehicle is a negative value, and the sum is theoretically equal to the initial value of the current of the power battery;
3) calculating the difference between the initial voltage value and the average voltage value of the power battery, and if the absolute value of the difference is equal to the average voltage value of the power battery, calculating the difference
In fact, the voltage is not limited to 2V, corresponding setting and adjustment can be carried out according to actual requirements, the voltage initial value monitored by the power battery is considered to be more accurate, and the voltage correction value of the power battery is the voltage initial value V of the power batteryout＝VBattery(ii) a If the absolute value of the difference is that
The initial value of the voltage monitored by the power battery is considered to be inaccurate, and the voltage correction value of the power battery is the average value of the voltage
4) Calculating the difference between the initial value of the current of the power battery and the average value of the current, and if the absolute value of the difference is equal to the average value of the current of the power battery, calculating the difference
Actually, the current correction value is not limited to 1A, corresponding setting adjustment can be carried out according to actual requirements, the current initial value monitored by the power battery is considered to be more accurate, and the power battery current correction value is the power battery current initial value Aout＝ABattery(ii) a If the absolute value of the difference is that
The current initial value monitored by the power battery is considered to be inaccurate, and the current correction value of the power battery is the current average value
4. If the vehicle is started, the fuel cell system is not started, and the vehicle is not in an idle speed and braking energy recovery state, namely the power battery, the motor and the voltage platform DCDC in the vehicle are all in working states, and the working components have certain reference significance to the voltage and current of the whole network; at the moment, the vehicle runs normally only by the power battery, and the operation is calculated according to the following steps:
1) calculating the average voltage value of the input ends of the power battery, the motor and the voltage platform DCDC in the vehicle,
wherein:
-a voltage average value;
VBattery-a power cell voltage initial value;
VMotor-a motor voltage initial value;
VDC-an in-vehicle voltage platform DCDC voltage initial value;
2) calculating the average value of the difference value between the current initial value of the power battery and the current initial values of other high-voltage components in the high-voltage network, namely calculating the current average value,
wherein:
-current average value;
ABattery-a power cell current initial value;
AMotor-an initial value of the motor current;
ADC-an in-vehicle current platform DCDC current initial value;
at the moment, the initial value of the current of the power battery is a positive value, the initial value of the current of the motor is a positive value, the initial value of the current platform DCDC in the vehicle is a positive value, the sum of the initial value of the current of the motor and the initial value of the current platform DCDC in the vehicle is a positive value, and the sum is theoretically equal to the initial value of the current of the power battery;
3) calculating the difference between the initial voltage value and the average voltage value of the power battery, and if the absolute value of the difference is equal to the average voltage value of the power battery, calculating the difference
In fact, the voltage is not limited to 2V, corresponding setting and adjustment can be carried out according to actual requirements, the voltage initial value monitored by the power battery is considered to be more accurate, and the voltage correction value of the power battery is the voltage initial value V of the power batteryout＝VBattery(ii) a If the absolute value of the difference is that
The initial value of the voltage monitored by the power battery is considered to be inaccurate, and the voltage correction value of the power battery is the average value of the voltage
4) Calculating the difference between the initial value of the current of the power battery and the average value of the current, and if the absolute value of the difference is equal to the average value of the current of the power battery, calculating the difference
Actually, the current correction value is not limited to 1A, corresponding setting adjustment can be carried out according to actual requirements, the current initial value monitored by the power battery is considered to be more accurate, and the power battery current correction value is the power battery current initial value Aout＝ABattery(ii) a If the absolute value of the difference is that
The current initial value monitored by the power battery is considered to be inaccurate, and the current correction value of the power battery is the current average value
5. If the vehicle is started, the fuel cell system is started, the vehicle is in an idling state, the motor is in a non-working state, the power battery and the voltage platform DCDC in the vehicle are in working states, and the working parts have certain reference significance to the voltage and the current of the whole network; and at the moment, the fuel cell charges the power battery, and the operation is calculated according to the following steps:
1) calculating the average voltage value of the input ends of the fuel cell, the power cell and the voltage platform DCDC in the vehicle,
wherein:
-a voltage average value;
VBattery-a power cell voltage initial value;
VFC-a fuel cell voltage initial value;
VDC-an in-vehicle voltage platform DCDC voltage initial value;
2) calculating the average value of the difference value between the current initial value of the power battery and the current initial values of other high-voltage components in the high-voltage network, namely calculating the current average value,
wherein:
-current average value;
ABattery-a power cell current initial value;
AFC-a fuel cell current initial value;
ADC-an in-vehicle current platform DCDC current initial value;
at the moment, the initial value of the current of the fuel cell is a positive value, the initial value of the current of the power cell is a negative value, the initial value of the current platform DCDC in the vehicle is a positive value, and the difference value of the initial value of the current of the fuel cell minus the initial value of the current platform DCDC in the vehicle is theoretically equal to the absolute value of the initial value of the current of the power cell;
3) calculating the difference between the initial voltage value and the average voltage value of the power battery, and if the absolute value of the difference is equal to the average voltage value of the power battery, calculating the difference
In fact, the voltage is not limited to 2V, corresponding setting and adjustment can be carried out according to actual requirements, the voltage initial value monitored by the power battery is considered to be more accurate, and the voltage correction value of the power battery is the voltage initial value V of the power batteryout＝VBattery(ii) a If the absolute value of the difference is that
The initial value of the voltage monitored by the power battery is considered to be inaccurate, and the voltage correction value of the power battery is the average value of the voltage
4) Calculating the difference between the initial value of the current of the power battery and the average value of the current, and if the absolute value of the difference is equal to the average value of the current of the power battery, calculating the difference
Actually, the current correction value is not limited to 1A, corresponding setting adjustment can be carried out according to actual requirements, the initial value of the current monitored by the power battery is considered to be more accurate, and the current correction value of the power battery is power electricityInitial value of cell current Aout＝ABattery(ii) a If the absolute value of the difference is that
The current initial value monitored by the power battery is considered to be inaccurate, and the current correction value of the power battery is the current average value
6. If the vehicle is started, the fuel cell system is started, the vehicle is in a braking energy recovery state, all the high-voltage components are in a working state, and each high-voltage component has reference significance on the voltage and the current of the whole network; at the moment, the fuel cell charges the power battery, the motor charges the power battery, and the operation is calculated according to the following steps:
1) calculating the average voltage value of the input ends of the fuel cell, the motor, the power cell and the voltage platform DCDC in the vehicle,
wherein:
-a voltage average value;
VBattery-a power cell voltage initial value;
VMotor-a motor voltage initial value;
VFC-a fuel cell voltage initial value;
VDC-an in-vehicle voltage platform DCDC voltage initial value;
2) calculating the average value of the difference value between the current initial value of the power battery and the current initial values of other high-voltage components in the high-voltage network, namely calculating the current average value,
wherein:
-current average value;
ABattery-a power cell current initial value;
AMotor-an initial value of the motor current;
AFC-a fuel cell current initial value;
ADC-an in-vehicle current platform DCDC current initial value;
at the moment, the initial value of the current of the fuel cell is a positive value, the initial value of the current of the motor is a negative value, the initial value of the current of the power cell is a negative value, the initial value of the current platform DCDC in the vehicle is a positive value, and the difference value obtained by subtracting the initial value of the current platform DCDC in the vehicle from the initial value of the current of the fuel cell and then subtracting the initial value of the current of the motor is theoretically equal to the absolute value of the initial value of the current of the power cell;
3) calculating the difference between the initial voltage value and the average voltage value of the power battery, and if the absolute value of the difference is equal to the average voltage value of the power battery, calculating the difference
In fact, the voltage is not limited to 2V, corresponding setting and adjustment can be carried out according to actual requirements, the voltage initial value monitored by the power battery is considered to be more accurate, and the voltage correction value of the power battery is the voltage initial value V of the power batteryout＝VBattery(ii) a If the absolute value of the difference is that
The initial value of the voltage monitored by the power battery is considered to be inaccurate, and the voltage correction value of the power battery is the average value of the voltage
4) Calculating the difference between the initial value of the current of the power battery and the average value of the current, and if the absolute value of the difference is equal to the average value of the current of the power battery, calculating the difference
Actually, the current correction value is not limited to 1A, corresponding setting adjustment can be carried out according to actual requirements, the current initial value monitored by the power battery is considered to be more accurate, and the power battery current correction value is the power battery current initial value Aout＝ABattery(ii) a If the absolute value of the difference is that
The current initial value monitored by the power battery is considered to be inaccurate, and the current correction value of the power battery is the current average value
7. If the vehicle is started, the fuel cell system is started, the vehicle is not in an idle state and a braking energy recovery state, the output power of the power battery is greater than 0, all the high-voltage components are in a working state, and each high-voltage component has reference significance to the voltage and the current of the whole network; the fuel cell and the power battery jointly drive the vehicle, and the operation is calculated according to the following steps:
1) calculating the average voltage value of the input ends of the fuel cell, the motor, the power cell and the voltage platform DCDC in the vehicle,
wherein:
-a voltage average value;
VBattery-a power cell voltage initial value;
VMotor-a motor voltage initial value;
VFC-a fuel cell voltage initial value;
VDC-an in-vehicle voltage platform DCDC voltage initial value;
2) calculating the average value of the difference value between the current initial value of the power battery and the current initial values of other high-voltage components in the high-voltage network, namely calculating the current average value,
wherein:
-current average value;
ABattery-a power cell current initial value;
AMotor-an initial value of the motor current;
AFC-a fuel cell current initial value;
ADC-an in-vehicle current platform DCDC current initial value;
at the moment, the initial value of the current of the fuel cell is a positive value, the initial value of the current of the motor is a positive value, the initial value of the current of the power cell is a positive value, the initial value of the current platform DCDC in the vehicle is a positive value, and the difference value obtained by subtracting the initial value of the current platform DCDC in the vehicle and then subtracting the initial value of the current of the motor from the initial value of the current of the fuel cell is theoretically equal to the initial value of the current of the power cell;
3) calculating the difference between the initial voltage value and the average voltage value of the power battery, and if the absolute value of the difference is equal to the average voltage value of the power battery, calculating the difference
In fact, the voltage is not limited to 2V, corresponding setting and adjustment can be carried out according to actual requirements, the voltage initial value monitored by the power battery is considered to be more accurate, and the voltage correction value of the power battery is the voltage initial value V of the power batteryout＝VBattery(ii) a If the absolute value of the difference is that
The initial value of the voltage monitored by the power battery is considered to be inaccurate, and the voltage correction value of the power battery is the average value of the voltage
4) Calculating the difference between the initial value of the current of the power battery and the average value of the current, and if the absolute value of the difference is equal to the average value of the current of the power battery, calculating the difference
Actually, the current correction value is not limited to 1A, corresponding setting adjustment can be carried out according to actual requirements, the current initial value monitored by the power battery is considered to be more accurate, and the power battery current correction value is the power battery current initial value Aout＝ABattery(ii) a If the absolute value of the difference is that
The current initial value monitored by the power battery is considered to be inaccurate, and the current correction value of the power battery is the current average value
8. If the vehicle is started, the fuel cell system is started, the vehicle is not in an idle state and a braking energy recovery state, the output power of the power battery is less than 0, all the high-voltage components are in a working state, and each high-voltage component has reference significance to the voltage and the current of the whole network; and at the moment, the fuel cell drives the vehicle and charges the power battery at the same time, and the operation is calculated according to the following steps:
1) calculating the average voltage value of the input ends of the fuel cell, the motor, the power cell and the voltage platform DCDC in the vehicle,
wherein:
-a voltage average value;
VBattery-power battery electricityA voltage initial value;
VMotor-a motor voltage initial value;
VFC-a fuel cell voltage initial value;
VDC-an in-vehicle voltage platform DCDC voltage initial value;
2) calculating the average value of the difference value between the current initial value of the power battery and the current initial values of other high-voltage components in the high-voltage network, namely calculating the current average value,
wherein:
-current average value;
ABattery-a power cell current initial value;
AMotor-an initial value of the motor current;
AFC-a fuel cell current initial value;
ADC-an in-vehicle current platform DCDC current initial value;
at the moment, the initial value of the current of the fuel cell is a positive value, the initial value of the current of the motor is a positive value, the initial value of the current of the power cell is a negative value, the initial value of the current platform DCDC in the vehicle is a positive value, and the difference value of subtracting the initial value of the current platform DCDC in the vehicle from the initial value of the current of the fuel cell and subtracting the initial value of the current of the motor is theoretically equal to the absolute value of the initial value of the current of the power cell;
3) calculating the difference between the initial voltage value and the average voltage value of the power battery, and if the absolute value of the difference is equal to the average voltage value of the power battery, calculating the difference
In fact, the voltage is not limited to 2V, corresponding setting and adjustment can be carried out according to actual requirements, the voltage initial value monitored by the power battery is considered to be more accurate, and the voltage correction value of the power battery is the voltage initial value of the power batteryVout＝VBattery(ii) a If the absolute value of the difference is that
The initial value of the voltage monitored by the power battery is considered to be inaccurate, and the voltage correction value of the power battery is the average value of the voltage
4) Calculating the difference between the initial value of the current of the power battery and the average value of the current, and if the absolute value of the difference is equal to the average value of the current of the power battery, calculating the difference
Actually, the current correction value is not limited to 1A, corresponding setting adjustment can be carried out according to actual requirements, the current initial value monitored by the power battery is considered to be more accurate, and the power battery current correction value is the power battery current initial value Aout＝ABattery(ii) a If the absolute value of the difference is that
The current initial value monitored by the power battery is considered to be inaccurate, and the current correction value of the power battery is the current average value
9. And sending the obtained current correction value and the power battery voltage correction value of the power battery to an estimation module, and estimating the SOC value of the power battery by the estimation module based on the current correction value and the voltage correction value of the power battery.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A fuel cell vehicle power battery SOC estimation system is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the data acquisition module is used for acquiring the initial current value and the initial voltage value of each high-voltage component under the current condition of the vehicle;
the correction module is used for correcting the current initial value and the voltage initial value of the power battery through the collected current initial value and voltage initial value of the high-voltage assembly to obtain a power battery current correction value and a power battery voltage correction value;
and the estimation module is used for estimating the SOC value of the power battery according to the current correction value and the voltage correction value of the power battery.
2. The fuel cell vehicle power cell SOC estimation system of claim 1, wherein: the correction module comprises a correction module and a correction module,
the average value acquisition module is used for calculating a current average value and a voltage average value according to the collected current initial value and voltage initial value of the high-voltage component;
and the threshold comparison module is used for comparing the absolute value of the difference between the current average value and the current initial value of the power battery with a set current threshold, selecting the current average value or the current initial value of the power battery as a power battery current correction value according to the comparison result, comparing the absolute value of the difference between the voltage average value and the voltage initial value of the power battery with a set voltage threshold, and selecting the voltage average value or the voltage initial value of the power battery as the power battery voltage correction value according to the comparison result.
3. The fuel cell vehicle power cell SOC estimation system according to claim 2, wherein: the average value obtaining module comprises a first module for obtaining an average value,
and the current average value acquisition module is used for calculating a current average value according to the current initial value of the power battery under the current vehicle condition and the current initial value of the high-voltage component except the power battery.
4. The fuel cell vehicle power cell SOC estimation system according to claim 2, wherein: the average value obtaining module comprises a first module for obtaining an average value,
and the voltage average value acquisition module is used for calculating a voltage average value according to the number of the high-voltage components in the working state under the current vehicle condition and respective voltage initial values.
5. An estimation method of a fuel cell vehicle power cell SOC estimation system according to any one of claims 1 to 4, characterized in that: the method comprises the steps of judging a vehicle state according to vehicle information, obtaining a current initial value and a voltage initial value of a high-voltage component in a working state in the vehicle based on the vehicle state, correcting the current initial value and the voltage initial value of the power battery through the current initial value and the voltage initial value of the high-voltage component to obtain a current correction value and a voltage correction value of the power battery, and estimating the SOC value of the power battery based on the current correction value and the voltage correction value.
6. The fuel cell vehicle power cell SOC estimation method according to claim 5, characterized in that: the method for correcting the initial current value of the power battery through the initial current value of the high-voltage component comprises the following steps: the method comprises the steps of obtaining a current initial value of a high-voltage component of a vehicle in the current state, calculating a current average value, comparing a current difference absolute value of the current average value and the current initial value of a power battery with a set current threshold value, taking the current average value as a current correction value of the power battery if the current difference absolute value is larger than the set current threshold value, and taking the current initial value of the power battery as the current correction value of the power battery if the current difference absolute value is not larger than the set current threshold value.
7. The fuel cell vehicle power cell SOC estimation method according to claim 5, characterized in that: the method for correcting the initial voltage value of the power battery through the initial voltage value of the high-voltage component comprises the following steps: the method comprises the steps of obtaining a voltage initial value of a high-voltage component in the current state of the vehicle, calculating a voltage average value, comparing the voltage average value with a voltage difference absolute value of the power battery voltage initial value with a set voltage threshold value, taking the voltage average value as a power battery voltage correction value if the voltage difference absolute value is larger than the set voltage threshold value, and taking the power battery current initial value as the power battery voltage correction value if the voltage difference absolute value is not larger than the set voltage threshold value.
8. The fuel cell vehicle power cell SOC estimation method according to claim 6, characterized in that: the method for calculating the average value of the current comprises the following steps: the method comprises the steps of obtaining a current initial value of a power battery and a high-voltage current initial value of a high-voltage component except the power battery under the current condition of the vehicle, wherein the average value of the current initial value of the power battery and the high-voltage current initial value is a current average value.
9. The fuel cell vehicle power cell SOC estimation method according to claim 7, characterized in that: the method for calculating the average voltage value comprises the following steps: the method comprises the steps of obtaining the number of high-voltage components in the working state and respective voltage initial values under the current condition of the vehicle, wherein the ratio of the sum of the voltage initial values to the number of the high-voltage components in the working state is a voltage average value.
10. The fuel cell vehicle power cell SOC estimation method according to claim 5, characterized in that: the high-voltage assembly comprises a power battery, a fuel cell, a motor and an in-vehicle voltage platform DCDC.
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