CN113125837A - Current sampling zero drift processing method and system - Google Patents
Current sampling zero drift processing method and system Download PDFInfo
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- CN113125837A CN113125837A CN202110413256.5A CN202110413256A CN113125837A CN 113125837 A CN113125837 A CN 113125837A CN 202110413256 A CN202110413256 A CN 202110413256A CN 113125837 A CN113125837 A CN 113125837A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The invention discloses a processing method and a processing method for current sampling zero drift, wherein the method comprises the following steps: after the low voltage is applied to the vehicle each time, starting vehicle phase current sampling, and respectively acquiring the current value of each phase of the three-phase power; taking the current value of each phase as the acquisition null shift of the phase; processing the collected zero drift to obtain an actual current zero drift value; and after the vehicle starts to work, the acquired current is processed by the actual current zero drift value to obtain the actual current value for controlling the whole vehicle. The invention has the advantages that: the zero drift value is obtained through automatic calculation according to actual conditions, so that the obtained zero drift value is more suitable for corresponding public, more accurate current value is obtained, more accurate data are provided for control over the whole vehicle, and control reliability of the whole vehicle is improved.
Description
Technical Field
The invention relates to the field of data acquisition precision, in particular to a current sampling zero drift processing method and system.
Background
The null shift concept (null shift) can be described as: when the input signal of the amplifying circuit is zero (namely no alternating current input), the static operating point is changed due to the influence of factors such as temperature change, unstable power supply voltage and the like, and the static operating point is amplified and transmitted step by step, so that the current of the output end of the circuit deviates from the original fixed value and floats up and down, which is also referred to as the phenomenon: and (4) zero drift. Under the condition of serious drift phenomenon, the effective signal is often submerged, so that the amplifying circuit can not work normally. The sensors all have zero drift, and the drift affects the measurement accuracy of the sensors, so a zero drift calculation method and a zero drift fault processing method must be found out.
In the prior art, a method of fixing a null shift value is often adopted in an industrial application for a null shift processing method, a calibrated null shift value is preset in a sensor or a controller, and then more accurate acquired data is obtained for controlling and using after superposition processing is performed on the basis of the preset null shift value and the acquired value.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a current sampling zero drift processing method and a current sampling zero drift processing system, which are used for zero drift processing in the field of vehicle motors.
In order to achieve the purpose, the invention adopts the technical scheme that: a processing method of current sampling zero drift starts vehicle phase current sampling after low voltage on a vehicle every time, and respectively collects current values of each phase of three-phase electricity; taking the current value of each phase as the acquisition null shift of the phase; processing the collected zero drift to obtain an actual current zero drift value; and after the vehicle starts to work, the acquired current is processed by the actual current zero drift value to obtain the actual current value for controlling the whole vehicle.
The processing of the acquisition zero drift of the current comprises the following steps: after the vehicle is charged with low voltage, a plurality of groups of sampling is carried out on each phase within set time to obtain a plurality of groups of sampling zero drift, and then the average value of the current acquisition zero drift of each phase is taken as the actual current zero drift value of the corresponding phase.
The processing method further comprises the following steps: after the actual current zero drift value is obtained through processing, a zero drift fault diagnosis module is started, whether the current zero drift fault exists or not is judged through the zero drift fault diagnosis module, if the current zero drift fault does not exist, the vehicle is allowed to be started at high voltage, and the acquired current is processed according to the actual current zero drift value after the vehicle is started, so that the actual current value used for controlling the whole vehicle is obtained; if the fault exists, the high voltage on the vehicle is forbidden and an alarm and a reminding signal are sent out.
And the zero drift fault diagnosis module is used for comparing the actual current zero drift value obtained by calculation with a preset zero drift threshold value, and judging that the current zero drift fault occurs when the actual current zero drift value of any phase is greater than the preset zero drift threshold value and the duration time is greater than a set time threshold value.
The zero drift threshold value is set in advance according to the percentage of the current detection range.
If the zero drift fault exists, the high voltage is forbidden to be supplied to the vehicle, the vehicle can only lower the low voltage, and is electrified again after the fault is reset, and the high voltage is allowed to be supplied after the power is on without the fault.
The utility model provides a processing system of current sampling zero drift, is including the current sensor that is arranged in gathering each phase current in the vehicle high voltage system and the controller that receives the current signal that current sensor transmitted, the controller is connected with vehicle state detecting element for detect the power-on state of vehicle, after detecting the vehicle and going up low pressure, the controller control current sensor detects out the current value of each phase respectively, handles the current value of each phase collection and obtains actual current zero drift value, and the controller obtains the true current value that is used for controlling whole car after handling the current of collection with actual current zero drift value after the vehicle starts high pressure.
The controller comprises a data processing unit, and the data processing unit is used for carrying out averaging operation on a plurality of groups of sampling zero drifts obtained by carrying out a plurality of groups of sampling on each phase within a set time, and obtaining an average value of the plurality of groups of sampling zero drifts of each phase as an actual current zero drift value.
The system also comprises a zero drift fault diagnosis module, after the actual current zero drift value is obtained through processing, the controller starts the zero drift fault diagnosis module, whether the current zero drift fault exists or not is judged through the zero drift fault diagnosis module, if no fault exists, the high-voltage starting of the vehicle is allowed, and after the starting, the acquired current is processed according to the actual current zero drift value, and then the actual current value used for controlling the whole vehicle is obtained; if the fault exists, the high voltage on the vehicle is forbidden and an alarm and reminding signal is sent out; the null shift fault diagnosis module is connected with the vehicle controller or the vehicle power system and used for sending a control signal to the vehicle controller or the vehicle power system so as to control the upper voltage of the vehicle.
And the zero drift fault diagnosis module is used for comparing the actual current zero drift value obtained by calculation with a preset zero drift threshold value, and judging that the current zero drift fault occurs when the actual current zero drift value of any phase is greater than the preset zero drift threshold value and the duration time is greater than a set time threshold value.
The invention has the advantages that: the zero drift value is automatically calculated according to the actual condition, so that the obtained zero drift value is disclosed more appropriately and correspondingly, more accurate current value is obtained, more accurate data is provided for the control of the whole vehicle, and the control reliability of the whole vehicle is improved; the zero drift value is subjected to fault diagnosis, so that the interference of the error zero drift value and the fault zero drift value on the control of the whole vehicle is avoided, and the reliability of the zero drift value is ensured; meanwhile, when the zero drift value is judged to be in fault, the whole vehicle is prohibited from starting, and the safety influence of the fault zero drift value on the running of the whole vehicle is effectively prevented; the automatic zero drift control system has the advantages that the automatic calculation mode is adopted when the system is started at each time, the zero drift corresponding to the working conditions such as the running temperature and the state of the vehicle is more fit, and compared with the fixed zero drift value in the prior art, the zero drift control system is more accurate and reliable, and the collected data are accurate, so that a data basis is provided for the safe and reliable control of the whole vehicle.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a flow chart of a prior art control scheme;
FIG. 2 is a flow chart of the control method of the present invention;
fig. 3 is a flow chart of the fault diagnosis of the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
The application is mainly applied to the field of automobiles, the motor controller of the automobile collects the three-phase current signals of the high-voltage alternating current of the whole automobile, then the control of the motor is realized according to the current, but the current data collected by the motor controller is inaccurate due to the current null drift, therefore, inaccurate and unreliable control caused by inaccurate collected current is caused, and based on the inaccurate and unreliable control, the zero drift processing is carried out on the data collected by the sensor in the prior art, as shown in figure 1, the traditional zero drift calculation is a controller prototype test, then the zero drift value is written in the program, but different controllers, particularly Hall sensors used for internal current sampling, have some differences in sampling circuits, the actual current zero drift of each controller has certain difference, if a fixed value is used, the adaptability is limited and the accuracy is reduced. Therefore, in order to make up for the defect, the application provides a method and a system for calculating the current null shift in real time.
The improvement point of the application is that each controller can calculate the current sampling null shift by itself by adding related software codes in the original sampling module so as to achieve the purpose of self-adaptation, and the method is as follows (as shown in a flow chart 2): the phase current sampling is carried out immediately after the vehicle is in a low-voltage (no high voltage, IGBT is in a closed state), and as the high voltage is not available and the actual phase current is not available, the average value of the three-phase current sampling result is respectively taken as the zero drift of the U/V/W three-phase current sampling of the controller every 500ms (the specific time can be set according to the calibration condition of the whole vehicle), the actual zero drift of each controller is realized, meanwhile, the original circuit design is not required to be modified and extra circuit design is not required to be added, the project development time and the maintenance cost are reduced, and the device is simple and practical.
The following description is made for the fault handling of null shift (as shown in the flowchart 3): when the whole vehicle is in a low-voltage static state (IGBT is in an off-tube state), the fault diagnosis module is started after the actual zero drift value of each controller is obtained in combination with the above, when the condition that any zero drift value in U/V/W three phases of the controllers is larger than the zero drift threshold value (15% of the current detection range is set according to the actual condition) is detected, if the condition lasts for 1000ms (set according to the actual condition), the phase current zero drift fault is reported, the high voltage on the whole vehicle is not allowed, the power is re-applied after the low-voltage electric fault is reset and the fault entering condition is not met, the fault exits, the whole vehicle can normally supply the high voltage, and the running reliability of the whole vehicle.
As shown in fig. 1, a processing method of current sampling zero drift starts vehicle phase current sampling after low voltage is applied to a vehicle each time, and respectively collects current values of each phase of three-phase power; the method comprises the steps of setting acquisition time, wherein the acquisition time is generally a short time after low voltage on the whole vehicle is quickly set, taking 500ms as an example, after low voltage is applied, a plurality of groups of current data can be acquired for each phase within 500ms, because the data acquisition sampling period is less than 500ms, a plurality of groups of data can be acquired, the current value of each phase is used as the acquisition null shift of the phase, the plurality of groups of sampling current values of each phase are subjected to average calculation, and the calculated average value is used as the actual current null shift value of the corresponding phase. The mean value is mainly used for reducing errors and reducing the influence of random errors. And after the high-voltage starting operation on the vehicle, the acquired current is processed by the actual current zero drift value to obtain the real current value for controlling the whole vehicle.
The working principle and the effect are as follows: firstly, if the sensor and the sampling circuit have no interference under the conditions of temperature and the like, and when the voltage is at the upper voltage and the lower voltage, the whole vehicle has no high voltage, the three-phase current of a high-voltage system acquired by the sensor and the sampling circuit is 0, if the three-phase current is not zero, the detected data is a zero drift value, therefore, the data acquisition is carried out immediately after the upper voltage and the lower voltage, the current values in U, V, W in three phases are acquired, because the current sampled in a period from the upper voltage to the lower voltage is more than one group, the current is confirmed by the acquisition period of the sensor and the sampling circuit, when the data is more than one group, the average value of the data is taken as the actual zero drift value of the acquired current, the averaging mainly reduces the influence caused by random errors, the set acquisition time is generally less than the time from the upper voltage to the lower voltage, and because the time, the acquisition time is typically short and fast and can be set to 500 ms. After the high voltage is applied to the whole vehicle, the controller superposes the acquired current data on the actual current zero drift value to obtain an accurate current value, and the whole vehicle controller, the current controller and the like control the whole vehicle function according to the accurate current value, so that accurate control is realized. The principle of the superimposed null shift is: when the null shift is +1mA, the actual accurate current value is obtained after the current I- (+1mA) acquired by the acquisition circuit, and so on.
In a preferred embodiment, in order to prevent the zero drift from being obviously abnormal due to the fact that a fault occurs in calculation or other faults cause obvious abnormal zero drift, because the obvious abnormal zero drift causes the whole vehicle to control the whole vehicle according to the current obtained by the obvious abnormal zero drift, a fault diagnosis module is needed to be arranged, after the actual current zero drift value is obtained through processing, the zero drift fault diagnosis module is started firstly, whether the current zero drift fault occurs or not is judged through the zero drift fault diagnosis module, and if no fault occurs, the high-voltage starting of the vehicle is allowed, and after the current is processed according to the actual current zero drift value after the starting, the actual current value used for controlling the whole vehicle is obtained; if the fault exists, the high voltage on the vehicle is forbidden and an alarm and a reminding signal are sent out.
Whether the zero drift fault exists or not is based on the calculated magnitude of the actual current zero drift value, the magnitude of the current zero drift value is generally within a certain range, and if the zero drift value is too large, the fault or the abnormity exists; and the zero drift fault diagnosis module is used for comparing the actual current zero drift value obtained by calculation with a preset zero drift threshold value, and judging that the current zero drift fault occurs when the actual current zero drift value of any phase is greater than the preset zero drift threshold value and the duration time is greater than a set time threshold value. The predetermined null shift value is typically a percentage of the range of the sensor, e.g. 15%, and when the range is C, the threshold value is C x 15%. The working principle is as follows: after the actual current zero drift value is calculated, whether the zero drift value is larger than a zero drift threshold value or not is judged, when the zero drift value is larger than the zero drift threshold value, the fact that an abnormality and a fault exist is indicated, the high voltage on the vehicle is forbidden, the vehicle can only be powered down, the vehicle is powered on again after the fault is reset, and the high voltage is allowed to be powered on after the vehicle is powered on without the fault. Thereby ensuring the safety and reliability of the whole vehicle. And when the actually calculated actual current zero drift is smaller than a set threshold value, the zero drift is reasonable, and in a set range, the controller stores the zero drift value, and when the high voltage is higher than the set threshold value, the accurate current value is obtained according to the detection value of the zero drift value superposition sensor for control. And the null shift value is erased or discarded after the lower high voltage.
A processing system of current sampling zero drift comprises a current sensor used for collecting each phase current in a vehicle high-voltage system and a controller used for receiving a current signal transmitted by the current sensor, wherein the controller is connected with a vehicle state detection unit and used for detecting the power-on state of a vehicle, when the upper low voltage of the vehicle is detected, the controller controls the current sensor to respectively detect the current value of each phase, the current value collected by each phase is processed to obtain an actual current zero drift value, and the controller processes the collected current with the actual current zero drift value after the vehicle starts to run at a high voltage to obtain an actual current value used for controlling the whole vehicle. And the data processing unit in the controller is used for carrying out averaging operation on a plurality of groups of sampling zero drifts obtained by carrying out a plurality of groups of sampling on each phase within a set time, and obtaining the average value of the plurality of groups of sampling zero drifts of each phase as an actual current zero drift value.
The method comprises the steps that a zero drift fault diagnosis module is arranged, after an actual current zero drift value is obtained through processing, a controller starts the zero drift fault diagnosis module, whether the current zero drift fault exists or not is judged through the zero drift fault diagnosis module, if no fault exists, high-voltage starting on a vehicle is allowed, and after the zero drift fault exists, collected current is processed according to the actual current zero drift value to obtain an actual current value used for controlling the whole vehicle; if the fault exists, the high voltage on the vehicle is forbidden and an alarm and reminding signal is sent out; the null shift fault diagnosis module is connected with the vehicle controller or the vehicle power system and used for sending a control signal to the vehicle controller or the vehicle power system so as to control the upper voltage of the vehicle. And the zero drift fault diagnosis module is used for comparing the actual current zero drift value obtained by calculation with a preset zero drift threshold value, and judging that the current zero drift fault occurs when the actual current zero drift value of any phase is greater than the preset zero drift threshold value and the duration time is greater than a set time threshold value.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (10)
1. A processing method of current sampling zero drift is characterized in that: after the low voltage is applied to the vehicle each time, starting vehicle phase current sampling, and respectively acquiring the current value of each phase of the three-phase power; taking the current value of each phase as the acquisition null shift of the phase; processing the collected zero drift to obtain an actual current zero drift value; and after the vehicle starts to work, the acquired current is processed by the actual current zero drift value to obtain the actual current value for controlling the whole vehicle.
2. The processing method of current sampling zero drift as claimed in claim 1, wherein: the processing of the acquisition zero drift of the current comprises the following steps: after the vehicle is charged with low voltage, a plurality of groups of sampling is carried out on each phase within set time to obtain a plurality of groups of sampling zero drift, and then the average value of the current acquisition zero drift of each phase is taken as the actual current zero drift value of the corresponding phase.
3. The processing method of current sampling null shift as claimed in claim 2, characterized in that: the processing method further comprises the following steps: after the actual current zero drift value is obtained through processing, a zero drift fault diagnosis module is started, whether the current zero drift fault exists or not is judged through the zero drift fault diagnosis module, if the current zero drift fault does not exist, the vehicle is allowed to be started at high voltage, and the acquired current is processed according to the actual current zero drift value after the vehicle is started, so that the actual current value used for controlling the whole vehicle is obtained; if the fault exists, the high voltage on the vehicle is forbidden and an alarm and a reminding signal are sent out.
4. A method for processing zero drift of current samples according to claim 3, wherein: and the zero drift fault diagnosis module is used for comparing the actual current zero drift value obtained by calculation with a preset zero drift threshold value, and judging that the current zero drift fault occurs when the actual current zero drift value of any phase is greater than the preset zero drift threshold value and the duration time is greater than a set time threshold value.
5. A processing method of current sampling zero drift as claimed in claim 3 or 4, characterized in that: the zero drift threshold value is set in advance according to the percentage of the current detection range.
6. A method for processing zero drift of current samples according to claim 3, wherein: if the zero drift fault exists, the high voltage is forbidden to be supplied to the vehicle, the vehicle can only lower the low voltage, and is electrified again after the fault is reset, and the high voltage is allowed to be supplied after the power is on without the fault.
7. A processing system of current sampling zero drift is characterized in that: the controller is connected with a vehicle state detection unit and used for detecting the power-on state of a vehicle, when the low voltage on the vehicle is detected, the controller controls the current sensor to detect the current value of each phase respectively, the current value collected by each phase is processed to obtain an actual current zero drift value, and the controller processes the collected current with the actual current zero drift value after the high voltage is started on the vehicle to obtain the actual current value used for controlling the whole vehicle.
8. A current sample null-shift processing system as defined in claim 7 wherein: the controller comprises a data processing unit, and the data processing unit is used for carrying out averaging operation on a plurality of groups of sampling zero drifts obtained by carrying out a plurality of groups of sampling on each phase within a set time, and obtaining an average value of the plurality of groups of sampling zero drifts of each phase as an actual current zero drift value.
9. A current sample null-shift processing system as defined in claim 7 wherein: the system also comprises a zero drift fault diagnosis module, after the actual current zero drift value is obtained through processing, the controller starts the zero drift fault diagnosis module, whether the current zero drift fault exists or not is judged through the zero drift fault diagnosis module, if no fault exists, the high-voltage starting of the vehicle is allowed, and after the starting, the acquired current is processed according to the actual current zero drift value, and then the actual current value used for controlling the whole vehicle is obtained; if the fault exists, the high voltage on the vehicle is forbidden and an alarm and reminding signal is sent out; the null shift fault diagnosis module is connected with the vehicle controller or the vehicle power system and used for sending a control signal to the vehicle controller or the vehicle power system so as to control the upper voltage of the vehicle.
10. A current sample null-shift processing system as defined in claim 9 wherein: and the zero drift fault diagnosis module is used for comparing the actual current zero drift value obtained by calculation with a preset zero drift threshold value, and judging that the current zero drift fault occurs when the actual current zero drift value of any phase is greater than the preset zero drift threshold value and the duration time is greater than a set time threshold value.
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