CN117584746A

CN117584746A - Method, device, intelligent device and medium for monitoring high-voltage components of vehicle

Info

Publication number: CN117584746A
Application number: CN202311743894.9A
Authority: CN
Inventors: 孙永朝; 王凯; 巩鑫
Original assignee: Weilai Automobile Technology Anhui Co Ltd
Current assignee: Weilai Automobile Technology Anhui Co Ltd
Priority date: 2023-12-18
Filing date: 2023-12-18
Publication date: 2024-02-23

Abstract

The application provides a method, equipment, intelligent equipment and medium for monitoring a high-voltage component of a vehicle, which comprise the steps of obtaining the current input power and the current output power of the high-voltage component to be monitored in a preset scene; determining a current efficiency value of the high-voltage component to be monitored according to the current input power and the current output power; generating an index value of the health index according to the current efficiency value; and determining the health state of the high-voltage component to be monitored according to the index value and the threshold value of the health index. Therefore, the process of acquiring the input power and the output power of the high-voltage component to be monitored can be simplified under a preset scene, and the complicated electric structure, mechanical structure, chemical structure and the like in the high-voltage component to be monitored are not needed to be considered, so that the health state of the high-voltage component to be monitored can be conveniently and rapidly obtained, and the safety of a vehicle can be timely found and improved when the high-voltage component to be monitored is unhealthy.

Description

Method, device, intelligent device and medium for monitoring high-voltage components of vehicle

Technical Field

The application relates to the technical field of vehicle monitoring, and particularly provides a method, equipment, intelligent equipment and medium for monitoring a high-voltage component of a vehicle.

Background

Compared with the traditional fuel oil automobile, the new energy automobile is added with a high-voltage system, and high-voltage components in the existing high-voltage system mainly comprise a high-voltage battery (High Voltage Energy Storage, HVES), a direct-current-to-direct-current converter (Direct Current Direct Current Converter, DCDC), a high-voltage electric drive (High Voltage Electric Drive, HVED) motor, an air-conditioning compressor (High Voltage Air Condition, HVAC), an On-Board Charger (OBC), a heater (High Voltage Coolant Heater, HVCH) and the like. Depending on the configuration of the vehicle type, redundant DCDC can be provided besides the main DCDC, and the auxiliary HVED can be provided besides the main HVED.

However, each high-voltage component of the new energy automobile has a complex electric structure, a mechanical structure and even a chemical structure; the alternating stresses born by the parts are different in operation, and the parts are different in characteristics at the aged parts under the complex alternating stresses. Therefore, how to accurately evaluate the health status of each high-voltage component is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

In order to solve the technical problems, the application is provided to realize the monitoring method, the equipment, the intelligent equipment and the medium of the vehicle high-voltage component for accurately evaluating the health state of the vehicle high-voltage component.

In a first aspect, the present application provides a method for monitoring a high-voltage component of a vehicle, including:

acquiring current input power and current output power of a high-voltage component to be monitored in a preset scene;

determining a current efficiency value of the high-voltage component to be monitored according to the current input power and the current output power;

generating an index value of the health index according to the current efficiency value;

and determining the health state of the high-voltage component to be monitored according to the index value and the threshold value of the health index.

In a second aspect, the present application provides a monitoring device for a vehicle high voltage component, the monitoring device comprising a processor and a storage means, the storage means being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the method of monitoring a vehicle high voltage component as described in any one of the preceding claims.

In a third aspect, a smart device is provided, which may comprise a monitoring device of a vehicle high voltage component as described above.

In a fourth aspect, a computer readable storage medium is provided, the computer readable storage medium storing a plurality of program codes adapted to be loaded and executed by a processor to perform the method of monitoring a vehicle high voltage component of any of the above.

Scheme 1. A method for monitoring a high voltage component of a vehicle, comprising:

The method for monitoring a high-voltage component of a vehicle according to the aspect 1 is characterized in that determining the health state of the high-voltage component to be monitored according to the index value and the threshold value of the health index comprises:

determining a comparison of the index value to a threshold value of the health index; wherein the number of comparison results is one or more;

when the number of the comparison results is one, if the comparison results indicate unhealthy, determining that the health state of the high-voltage component to be monitored is unhealthy; if the comparison result indicates health, determining that the health state of the high-voltage component to be monitored is healthy;

When the number of the comparison results is a plurality of, if at least two comparison results indicate unhealthy, determining that the health state of the high-voltage component to be monitored is unhealthy; and if at most one comparison result shows that the high-voltage component is unhealthy, determining that the health state of the high-voltage component to be monitored is healthy.

determining a comparison of the index value to a threshold value of the health index; wherein the number of the comparison results is one or more, and when the number of the comparison results is a plurality of the comparison results, at least one comparison result is a designated comparison result;

when the number of the comparison results is a plurality of, if at least one of all the specified comparison results indicates unhealthy, determining that the health state of the high-voltage component to be monitored is unhealthy; and if all the specified comparison results indicate health, determining that the health state of the high-voltage component to be monitored is healthy.

Solution 4. The method for monitoring a high-voltage component of a vehicle according to the embodiment 2 or 3, characterized in that,

the index value of the health index includes at least one of an efficiency index value, an index value of an efficiency decay degree, and an index value of an efficiency decline gradient;

the threshold value of the health index includes at least one of an efficiency threshold value, a threshold value of an efficiency decay degree, and a threshold value of a rate-decrease gradient

The comparison result comprises at least one of a first comparison result, a second comparison result and a third comparison result;

wherein the first comparison result is the magnitude relation between the efficiency index value and the efficiency threshold value;

the second comparison result is the magnitude relation between the index value of the efficiency attenuation degree and the threshold value of the efficiency attenuation degree;

and the third comparison result is the magnitude relation between the index value of the efficiency decline gradient and the threshold value of the efficiency decline gradient.

The method for monitoring a high-voltage component of a vehicle according to claim 4 is characterized in that generating an index value of a health index according to the current efficiency value comprises:

if the index value of the health index comprises an efficiency index value, taking the current efficiency value as the efficiency index value;

If the index value of the health index comprises an index value of the efficiency attenuation degree, taking a difference value between the current efficiency value and the offline test efficiency value in the preset scene as the index value of the efficiency attenuation degree; the off-line test efficiency value is an efficiency value of the high-voltage component to be monitored when the high-voltage component reaches the standard under the preset scene and the product is off-line;

and if the index value of the health index comprises the index value of the efficiency decline gradient, taking the difference value between the current efficiency value and the previous efficiency value in the preset scene as the index value of the efficiency decline gradient.

Solution 6. The method for monitoring a high-voltage component of a vehicle according to solution 4, characterized in that,

if the efficiency index value is smaller than the efficiency threshold value, the first comparison result indicates that the high-voltage component to be monitored is unhealthy;

if the efficiency index value is greater than or equal to the efficiency threshold value, the first comparison result indicates that the high-voltage component to be monitored is healthy;

if the index value of the efficiency attenuation degree is greater than the threshold value of the efficiency attenuation degree, the second comparison result indicates that the high-voltage component to be monitored is unhealthy;

If the index value of the efficiency attenuation degree is smaller than or equal to the threshold value of the efficiency attenuation degree, the second comparison result indicates that the high-voltage component to be monitored is healthy;

if the index value of the efficiency decline gradient is greater than the threshold value of the efficiency decline gradient, the third comparison result indicates that the high-voltage component to be monitored is unhealthy;

and if the index value of the efficiency decline gradient is smaller than or equal to the threshold value of the efficiency decline gradient, the third comparison result indicates that the high-voltage component to be monitored is healthy.

The method for monitoring a high-voltage component of a vehicle according to claim 1, wherein the high-voltage component to be monitored includes a dc-dc converter;

the method for acquiring the current input power and the current output power of the high-voltage component to be monitored in the preset scene comprises the following steps:

if the first voltage and the first current of the input side of the direct current-direct current converter are acquired, obtaining the current input power of the direct current-direct current converter according to the first voltage and the first current;

if the first voltage and the first current of the input side of the direct current-direct current converter are not acquired, taking the difference value of the output power and the line loss power of the high-voltage battery as the current input power of the direct current-direct current converter;

And obtaining the current output power of the direct current-direct current converter according to the second voltage and the second current of the output side of the direct current-direct current converter.

The method for monitoring a high-voltage component of a vehicle according to claim 1, characterized in that the high-voltage component to be monitored includes a high-voltage driving motor;

when the high-voltage driving motor operates in a driving mode in the preset scene, acquiring the current input power of the high-voltage driving motor and the current output power of the high-voltage driving motor according to a first mode:

the first mode includes:

if a third voltage and a third current of the input side of the high-voltage driving motor are acquired, obtaining the current input power of the high-voltage driving motor according to the third voltage and the third current;

if the third voltage and the third current of the input side of the high-voltage driving motor are not collected, obtaining the current input power of the high-voltage driving motor according to the output power and the line loss power of the high-voltage battery;

obtaining the current output power of the high-voltage driving motor according to the torque value and the rotating speed of the high-voltage driving motor;

When the high-voltage driving motor operates in a power generation mode in the preset scene, acquiring the current input power of the high-voltage driving motor and the current output power of the high-voltage driving motor according to a second mode:

the second mode includes:

if a third voltage and a third current of the input side of the high-voltage driving motor are acquired, obtaining the current output power of the high-voltage driving motor according to the third voltage and the third current;

if the third voltage and the third current of the input side of the high-voltage driving motor are not collected, obtaining the current output power of the high-voltage driving motor according to the output power and the line loss power of the high-voltage battery;

and obtaining the current input power of the high-voltage driving motor according to the torque value and the rotating speed of the high-voltage driving motor.

The method for monitoring a high-voltage component of a vehicle according to claim 1, characterized in that the high-voltage component to be monitored includes a high-voltage drive motor;

when the high-voltage driving motor operates in a driving mode in the preset scene, acquiring the current input power of the high-voltage driving motor and the current output power of the high-voltage driving motor according to a third mode:

The third mode includes:

if the third voltage and the third current of the input side of the high-voltage driving motor are not collected, obtaining the current input power of the high-voltage driving motor according to the output power of the high-voltage battery, the line loss power and the consumption power of the direct-current converter;

when the high-voltage driving motor operates in a power generation mode in the preset scene, acquiring the current input power of the high-voltage driving motor and the current output power of the high-voltage driving motor according to a fourth mode:

the fourth aspect includes:

if the third voltage and the third current of the input side of the high-voltage driving motor are not collected, obtaining the current output power of the high-voltage driving motor according to the output power of the high-voltage battery, the line loss power and the consumption power of the direct-current converter;

The method for monitoring the high-voltage component of the vehicle according to the scheme 1 is characterized in that the high-voltage component to be monitored comprises a vehicle-mounted charger;

obtaining the current input power of the vehicle-mounted charger according to the association relation between the preset input power and the residual electric quantity of the high-voltage battery;

and obtaining the current output power of the vehicle-mounted charger according to the output power and the line loss power of the high-voltage battery.

and obtaining the current output power of the vehicle-mounted charger according to the output power of the high-voltage battery, the line loss power and the consumption power of the direct current-direct current converter.

An arrangement for monitoring a vehicle high voltage component, characterized in that it comprises a processor and a memory means adapted to store a plurality of program codes adapted to be loaded and run by the processor to carry out the method for monitoring a vehicle high voltage component according to any one of the claims 1 to 11.

Scheme 13. An intelligent device, characterized in that it comprises a monitoring device for high voltage components of a vehicle according to scheme 12.

A computer readable storage medium having stored thereon a plurality of program codes adapted to be loaded and executed by a processor to perform the method of monitoring a vehicle high voltage component of any one of claims 1 to 11.

The technical scheme has at least one or more of the following beneficial effects:

in the technical scheme of implementing the application, the current input power and the current output power of the high-voltage component to be monitored in a preset scene are obtained; determining a current efficiency value of the high-voltage component to be monitored according to the current input power and the current output power; generating an index value of the health index according to the current efficiency value; and determining the health state of the high-voltage component to be monitored according to the index value and the threshold value of the health index. Therefore, the process of acquiring the input power and the output power of the high-voltage component to be monitored can be simplified under a preset scene, and the current efficiency value of the high-voltage component to be monitored is obtained, and an index value for evaluating the health index of the health state of the high-voltage component to be monitored is generated, so that the health state of the high-voltage component to be monitored can be conveniently and rapidly obtained without considering the complicated electrical structure, mechanical structure, chemical structure and the like of the high-voltage component to be monitored, and the safety of a vehicle can be timely found and improved when the high-voltage component to be monitored is unhealthy.

Drawings

The disclosure of the present application will become more readily understood with reference to the accompanying drawings. As will be readily appreciated by those skilled in the art: these drawings are for illustrative purposes only and are not intended to limit the scope of the present application. Moreover, like numerals in the figures are used to designate like parts, wherein:

FIG. 1 is a schematic diagram of the topology of a high voltage system within a new energy automobile;

FIG. 2 is a flow chart of the main steps of a method of monitoring a vehicle high voltage component according to one embodiment of the present application;

FIG. 3 is a schematic flow chart of an aging pre-warning by using the method for monitoring the vehicle high-voltage component;

fig. 4 is a main structural block diagram of a monitoring apparatus of a high-voltage component of a vehicle according to an embodiment of the present application.

Detailed Description

Some embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application.

In the description of the present application, a "module," "processor" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, or software components, such as program code, or a combination of software and hardware. The processor may be a central processor, a microprocessor, an image processor, a digital signal processor, or any other suitable processor. The processor has data and/or signal processing functions. The processor may be implemented in software, hardware, or a combination of both. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, and the like. The term "a and/or B" means all possible combinations of a and B, such as a alone, B alone or a and B. The term "at least one A or B" or "at least one of A and B" has a meaning similar to "A and/or B" and may include A alone, B alone or A and B. The singular forms "a", "an" and "the" include plural referents.

Fig. 1 is a schematic topological structure diagram of a high-voltage system in a new energy automobile, and as shown in fig. 1, high-voltage components in the high-voltage system mainly comprise HVES, DCDC, HVED, HVAC, OBC, HVCH and the like. Depending on the configuration of the vehicle, there may be redundant DCDCs (not shown in the figure) in addition to the primary DCDC, and there may be auxiliary HVEDs in addition to the primary HVEDs (not shown in the figure). Wherein PDU is high-voltage junction box, BMS is battery controller, relay is high-voltage Relay, inverter is motor controller, GB is gear box, EM is motor.

HVES can measure the pre-relay voltage U _batt1 Unit V, post-relay voltage U _batt2 Unit V, DC current I _batt Unit a.

DCDC can measure input terminal high voltage H _v U _dcdc Unit V, optional input current H _v I _dcdc Unit A, output low voltage L _v U _dcdc Unit V, output current L _v I _dcdc Unit a.

HVED can measure input terminal high voltage H _v U _hved Unit V, optional input current H _v I _hved Unit A, three-phase current I _U ，I _V ，I _W Unit A, motor output Speed _hved Unit rpm, motor field angle θ, unit rad, motor temperature T _EM Units degC;

HVAC can measure input high voltage H _v U _hvac Unit V, input current H _v I _hvac Unit A, air conditioner compressor Speed _hvac In rpm.

OBC can measure output terminal high voltage H _v U _obc Unit V.

Each high-voltage part of the new energy automobile has a complex electric structure, a mechanical structure and even a chemical structure; the alternating stresses born by the parts are different in operation, and the parts are different in characteristics at the aged parts under the complex alternating stresses.

Considering that the high-voltage components of the vehicle are of an electric structure, a mechanical structure or a chemical structure, when the high-voltage components run in an alternating load environment for a long time, active electrons in the electric structure can be reduced, the resistance of a metal material can be increased, the heat resistance of a heat dissipation module can be increased due to material deformation, the heat dissipation module can be worn out to be increased due to lubrication deterioration in the mechanical structure, the output torque is reduced due to the increased wear, and the loss is increased due to active material loss, electrode structure damage and the like in the chemical structure. The health status of a certain high-voltage component can be evaluated by accurately calculating the overall efficiency of the high-voltage component.

Based on this, in order to carry out accurate health status assessment to each high-voltage component, the application provides the following technical scheme:

in one implementation, referring to fig. 2, fig. 2 is a schematic flow chart of main steps of a method for monitoring a high voltage component of a vehicle according to an embodiment of the present application. As shown in fig. 2, the method for monitoring a high-voltage component of a vehicle in the embodiment of the present application mainly includes the following steps 201 to 204.

Step 201, acquiring current input power and current output power of a high-voltage component to be monitored in a preset scene;

in a specific implementation process, the working conditions of the high-voltage components are different under different scenes of the vehicle, and the efficiency calculation difficulty of the high-voltage components is different under different working conditions, so that in order to simplify the calculation of the efficiency of the high-voltage components to be monitored, the efficiency calculation can be performed according to the working conditions of the high-voltage components to be monitored in a preset scene. Therefore, the current input power and the current output power of the high-voltage component to be monitored in the preset scene can be obtained. In this way, the calculation of the current input power, the current output power of the high-voltage component to be monitored can be simplified.

In a specific implementation process, according to the working conditions of each high-voltage component in different vehicle scenes, 13 scenes can be distinguished, but not limited to the following scenes, and the scene distinguishing function can be completed by a whole vehicle controller or any other controller capable of receiving the running states of each high-voltage component. Table 1 is an analysis table of the operation conditions of each high-voltage component in different car scenes.

TABLE 1

The HVES relay on/off state distinction can be judged by receiving relay state information of the HVES; can also receive the voltage U before and after the HVES relay _batt1 ，U _batt2 To distinguish, e.g. when U _batt2 Greater than 90% U _batt1 When the relay is considered to be closed, when U _batt2 Below 60V, the relay is considered open.

The working/non-working state of the HVED is distinguished, and can be judged by receiving the working state information of the inverter of the HVED, when all half-bridges of the inverter are turned off or actively short-circuited, the HVED is considered to be non-working, and when the inverter performs switching tube action, the HVED is considered to be working; can also be distinguished by receiving HVED calculated Torque values, e.g. when Torque is _hved At absolute values less than 1Nm, the HVED is considered to be inoperative when Torque is exceeded _hved At absolute values greater than 50Nm, HVED is considered to operate.

The DCDC operating/non-operating state distinction can be determined by receiving the DCDC operating state information, or by receiving the DCDC low-side current L _v I _dcdc To distinguish, for example, when the low side current value is less than 0.1A, DCDC is considered to be inactive, and when the low side current value is greater than 1A, DCDC is considered to be active.

HVAC on/off status discrimination, possibly by receiving HVACJudging the working state information of the inverter; may also be distinguished by receiving an HVAC compressor Speed value, e.g. when the Speed value Speed _hvac Below 10rpm, the HVAC is considered inoperative, when the Speed value Speed _hvac Above 100rpm, HVAC operation is considered.

The working/non-working state of the OBC is distinguished, and can be judged by receiving the working state information of the OBC; it may also be distinguished by receiving an OBC output voltage value, such as when the voltage value is less than 60V, the OBC is considered to be inactive, and when the voltage value is greater than 250V, the OBC is considered to be active.

In a specific implementation process, any high-voltage component can be selected as the high-voltage component to be monitored according to actual requirements, and the current input power and the current output power of the high-voltage component to be monitored are calculated by using an achievable mode.

In practical application, since the HVCH consumes high-voltage electric energy, heats the internal resistance wire, and further heats the cooling liquid of the high-voltage battery, the output power of the cooling liquid is not easy to measure, so that the cooling liquid can correspond to the scene 12, and no matter whether other components work or not after the HVCH is activated, the efficiency is not calculated.

Because HVAC is the high-voltage electric energy that consumes to make air conditioner compressor operation, air conditioner compressor often adopts the I/F control, and work in rotational speed mode does not have phase current measurement, so can't obtain accurate output torque, therefore this application also does not carry out efficiency calculation to it, but, if HVAC air conditioner compressor's output torque can measure or can accurately calculate, this application is applicable to HVAC efficiency's accurate calculation equally, can select to carry out the calculation of HVAC efficiency under the simplification scene when scene 4 or 10, and then monitor its health status.

For DCDC, HVED, OBC, etc., the input power and the output power can be accurately calculated or measured, so the present application is mainly directed to DCDC, HVED, OBC in a preset scenario, where DCDC, HVED, OBC waits for the acquisition of the current input power and the current output power of the high voltage component, so as to perform efficiency calculation.

Specifically, if the high voltage component to be monitored includes DCDC, a scenario in which only HVES, DCDC, is operating, i.e., scenario 1, may be selected, where the output power of the high voltage battery minus the input power with line loss equal to DCDC. If the DCDC inputs high-voltage side voltage and the current is measured by the sensor, the DCDC is not limited by scenes. Therefore, the current input power and the current output power of the DCDC in the preset scenario can be acquired as follows.

a1, if a first voltage and a first current of the DCDC input side are acquired, obtaining the current input power of the DCDC according to the first voltage and the first current;

in one embodiment, the first voltage at the DCDC input side can be expressed as H _v U _dcdc The first current at the DCDC input side can be noted as H as described above _v I _dcdc . At this time, the DCDC current input power may be calculated according to the following calculation formula (1):

DCDC current input power=h _v U _dcdc *H _v I _dcdc (1)

a2, if the first voltage and the first current of the input side of the DCDC are not acquired, taking the difference value of the output power and the line loss power of the high-voltage battery as the current input power of the DCDC;

in one embodiment, the output power of the high-voltage battery may be determined by the aforementioned post-relay voltage U _batt2 And direct current I _batt Obtained. The DCDC current input power may be calculated according to the following calculation formula (2):

DCDC current input power=u _batt2 *I _batt -I ² _batt R (2)

Wherein R is the high voltage line resistance.

a3, obtaining the current output power of the DCDC according to the second voltage and the second current of the DCDC output side;

in one embodiment, the second voltage at the output side of DCDC can be expressed as L _v U _dcdc The second current at the output side of DCDC can be expressed as L _v I _dcdc . At this time, the DCDC current output power may be calculated according to the following calculation formula (3):

DCDC current output power=l _v U _dcdc *L _v I _dcdc (3)

If the high voltage component to be monitored comprises an HVED, a scenario in which only the HVES, HVED, is operating, i.e. scenario 6 or 8, may be selected. In scenario 6, the output power of the high voltage battery minus the line loss is equal to the input power of the HVED due to the vehicle driving. In scenario 8, as the vehicle is traveling with power generation, the output power of the HVED minus the line loss is equal to the input power of the high-voltage battery. If the HVED inputs high-voltage side voltage and current are all measured by the sensor, the HVED is not limited by scenes

Thus, for scenario 6 (HVED operating in drive mode), the current input power of the HVED and the current output power of the HVED may be obtained in the first manner (b 1 to b 3).

b1, if a third voltage and a third current of the HVED input side are acquired, obtaining the current input power of the HVED according to the third voltage and the third current;

in one implementation, the third voltage at the input side of the HVED may be referred to as H as described above _v U _hved The third current at the input side of the HVED can be denoted as H _v I _hved . At this time, the HVED current input power may be calculated according to the following calculation formula (4):

HVED current input power = H _v U _hved *H _v I _hved (4)

b2, if the third voltage and the third current of the HVED input side are not acquired, obtaining the current input power of the HVED according to the output power and the line loss power of the high-voltage battery;

in one embodiment, the output power of the high-voltage battery may be determined by the aforementioned post-relay voltage U _batt2 And direct current I _batt Obtained. The HVED current input power may be calculated according to the following equation (5):

HVED current input power = U _batt2 *I _batt -I ² _batt R (5)

b3, obtaining the current output power of the HVED according to the torque value and the rotating speed of the HVED;

in one implementation, the Torque value of the HVED may be recorded as the Torque described above _hved The Speed of HVED can be recorded as the Speed _hved . At this time, the current output power of the HVED, that is, the power of the torque generated by the rotation of the motor, can be specifically calculated according to the following calculation formula (6):

in one implementation, the Torque _hved The torque calculation can be accurately calculated by methods such as, but not limited to, a parametric formula method, a power method, a table look-up method, etc., and the torque calculation is described below by using only the parametric formula method, and other torque calculation methods not listed are considered to be equivalent.

For a permanent magnet synchronous motor, torque calculation can be referred to as equation (7):

wherein P is the pole pair number, L is a fixed value _d ，L _q For d and q axis inductances, the inductance can be obtained through motor calibration, and ψ is a permanent magnet flux linkage, and the inductance can be obtained through calibration, I _d ，I _q The d and q-axis currents can be calculated by three-phase currents and magnetic field angles.

For asynchronous motors, torque calculation can be referred to equation (8):

for scenario 8 (HVED operating in generating mode), the current input power of the HVED and the current output power of the HVED may be obtained in a second manner (manner c1 to c 3).

c1, if a third voltage and a third current of the HVED input side are acquired, obtaining the current output power of the HVED according to the third voltage and the third current;

In this scenario, the HVED current output power may be calculated as follows equation (9):

HVED current output power = H _v U _hved *H _v I _hved (9)

That is, the input power and output power are opposite when the HVED is operating in the generating mode and the HVED is operating in the driving mode.

c2, if the third voltage and the third current of the HVED input side are not acquired, obtaining the current output power of the HVED according to the output power and the line loss power of the high-voltage battery;

the HVED current output power can be calculated as follows (10):

HVED current output power = U _batt2 *I _batt +I ² _batt R (10)

And c3, obtaining the current input power of the HVED according to the torque value and the rotating speed of the HVED.

The current input power of the HVED can be specifically calculated according to the following calculation formula (11):

in scenario 6 or scenario 8, where the vehicle is traveling but the DCDC is not operating, such scenario can only be set for a short period of time, preventing small battery feeds from causing steering or braking dysfunction. In actual vehicle operation, scenario 7 or scenario 9 is the most usage scenario in which HVED input power in drive mode (scenario 7) needs to be subtracted from the power consumed by DCDC on the basis of scenario 6; the HVED output power in the generation mode (scenario 9) is based on scenario 8 plus the power consumed by DCDC. The power consumed by DCDC may be divided by the DCDC output power divided by the DCDC efficiency, which may be the ratio of the current output power of DCDC to the current input power of DCDC, i.e η _dcdc Is DCDC efficiency.

Thus, for scenario 7 (HVED operating in drive mode), the current input power of the HVED and the current output power of the HVED may be obtained in a third manner (d 1 to d 3).

d1, if a third voltage and a third current of the HVED input side are acquired, obtaining the current input power of the HVED according to the third voltage and the third current;

the HVED current input power may be calculated according to the following equation (12):

HVED current input power = H _v U _hved *H _v I _hved (12)

d2, if the third voltage and the third current of the HVED input side are not acquired, obtaining the current input power of the HVED according to the output power of the high-voltage battery, the line loss power and the consumed power of the DCDC;

the HVED current input power may be calculated according to the following equation (13):

d3, obtaining the current output power of the HVED according to the torque value and the rotating speed of the HVED;

specifically, the process may refer to the expression (6).

For scenario 9 (HVED operating in generating mode), the current input power of the HVED and the current output power of the HVED may be obtained in accordance with the fourth aspect (e 1 to e 3):

e1, if a third voltage and a third current of the HVED input side are acquired, obtaining the current output power of the HVED according to the third voltage and the third current;

The HVED current output power can be calculated as follows (14):

HVED current output power = H _v U _hved *H _v I _hved (14)

e2, if the third voltage and the third current of the HVED input side are not acquired, obtaining the current output power of the HVED according to the output power of the high-voltage battery, the line loss power and the consumed power of the DCDC;

the HVED current output power can be calculated as follows (15):

and e3, obtaining the current input power of the HVED according to the torque value and the rotating speed of the HVED.

Specifically, the process may refer to the expression (11).

If the high voltage component to be monitored comprises an OBC, a scenario in which only HVES, OBC, is operating, i.e. scenario 2, may be selected. In scenario 2, the output power of the OBC charging minus the line loss is equal to the input power of the HVES, and since the ac slow charging is to obtain ac from the grid, the ac is changed into dc by means of the internal inverter module of the OBC, and the high-voltage battery is charged. Considering that the OBC input side may not have a sensor to measure input voltage and current, and the power grid capacity is often enough, the voltage fluctuation is small, the charging power is only affected by the residual battery capacity, the corresponding relation between the charging power and the residual battery capacity of the high-voltage battery can be actually measured on a laboratory or a whole vehicle, and the corresponding relation is used as the incidence relation between the input power and the residual battery capacity of the high-voltage battery when the OBC works. And then, obtaining the current input power of the OBC according to the association relation between the preset input power and the residual electric quantity of the high-voltage battery. The correlation between the input power and the remaining power of the high-voltage battery can be referred to as a calculation formula (16):

Pin _obc ＝f(Batt _soc ) (16)

In a specific implementation process, the current output power of the OBC may be obtained according to the output power and the line loss power of the high-voltage battery. The current output power of the OBC is calculated according to the following equation (17):

OBC current output power = U _batt2 *I _batt +I ² _batt R (17)

The vehicle charges but DCDC does not work, and this kind of scene can only set up for a short time, prevents that little storage battery feed from leading to charge function abnormality. In practical applications, scenario 3 is the most use scenario where the input power of the high voltage battery is equal to the OBC output power minus the line loss, minus the DCDC power consumed.

In this case, the current input power of the OBC can still be obtained according to the calculation formula (16). The current output power of the OBC can be obtained according to the calculation formula (18):

step 202, determining a current efficiency value of the high-voltage component to be monitored according to the current input power and the current output power;

in one specific implementation, the ratio of the current output power to the current input power may be used as the current efficiency value of the high voltage component to be monitored.

For DCDC, the DCDC current efficiency value may be calculated according to equation (19):

for an HVED, in a drive mode corresponding to a scenario in which only the HVES, the HVED, operates (scenario 6), the HVED current efficiency value may be calculated according to equation (20):

For the HVED, in a power generation mode corresponding to a scenario in which only the HVES, the HVED, operates (scenario 8), the HVED current efficiency value may be calculated according to equation (21):

for the HVED, in the drive mode corresponding to the scenario where only HVES, HVED and DCDC are operating (scenario 7), the HVED current efficiency value may be calculated according to equation (22):

for the HVED, in a power generation mode corresponding to a scenario in which only the HVES, the HVED and the DCDC operate (scenario 9), the HVED current efficiency value may be calculated according to the calculation formula (23):

/>

for OBC, in a power generation mode (scenario 2) corresponding to a scenario where only HVES, OBC, is operating, the HVED current efficiency value may be calculated according to equation (24):

for OBC, in a power generation mode corresponding to a scenario where only HVES, OBC and DCDC are operating (scenario 2), the HVED current efficiency value may be calculated according to equation (25):

step 203, generating an index value of the health index according to the current efficiency value;

in a specific implementation process, after the current efficiency value of the high-voltage component to be monitored is obtained, an index value of at least one health index can be obtained according to the current efficiency value of the high-voltage component to be monitored. Wherein the index value of the health index includes at least one of an efficiency index value, an index value of an efficiency decay degree, and an index value of an efficiency decline gradient.

In a specific implementation process, if the index value of the health index includes an efficiency index value, the absolute value of the current efficiency value is used as the efficiency index value.

In a specific implementation process, if the index value of the health index comprises an index value of the efficiency attenuation degree, taking a difference value between the current efficiency value and the offline test efficiency value in the preset scene as the index value of the efficiency attenuation degree; the off-line test efficiency value is an efficiency value of the high-voltage component to be monitored when the product is off-line after the high-voltage component to be monitored is tested to reach the standard in the preset scene. That is, or when the high-voltage component completes the test in the preset scene and the test reaches the standard, the high-voltage component is taken down, and the efficiency value of the high-voltage component to be monitored is recorded at this time as the offline test efficiency value in the preset scene, wherein the offline test efficiency value is the initial value of the high-voltage component to be monitored in health. After the current efficiency value of the high-voltage component to be monitored is obtained, under the same scene, calculating the difference between the current efficiency value of the high-voltage component to be monitored and the efficiency offline test efficiency value of the high-voltage component to be monitored to represent the attenuation degree of the high-voltage component to be monitored relative to the efficiency of the high-voltage component to be monitored when the high-voltage component to be monitored is just offline, taking the difference as an index value of the efficiency attenuation degree,

In a specific implementation process, if the index value of the health index includes an index value of an efficiency decline gradient, a difference value between the current efficiency value and a previous efficiency value in the preset scene is used to represent whether a large change occurs between the to-be-monitored high-voltage component and the previous efficiency of the to-be-monitored high-voltage component, and the difference value is used as the index value of the efficiency decline gradient.

And 204, determining the health state of the high-voltage component to be monitored according to the index value and the threshold value of the health index.

In one specific implementation, step 204 may be implemented according to, but not limited to, the following two ways:

first kind:

(11) Determining a comparison of the index value to a threshold value of the health index; wherein the number of comparison results is one or more;

in a specific implementation process, the index value and the threshold value of the health index can be compared to obtain a comparison result, and when the index value and the threshold value of the health index are both one, the number of the comparison results is one. When the index value and the threshold value of the health index are multiple, the number of the comparison results is multiple.

Specifically, the index value of the health index includes at least one of an efficiency index value, an index value of an efficiency decay degree, and an index value of an efficiency decline gradient;

(12) When the number of the comparison results is one, if the comparison results indicate unhealthy, determining that the health state of the high-voltage component to be monitored is unhealthy; if the comparison result indicates health, determining that the health state of the high-voltage component to be monitored is healthy;

in a specific implementation, when the number of comparison results is one, that is, the comparison result includes only the first comparison result, or only the second comparison result, or only the third comparison result. If the first comparison result, or the second comparison result, or the third comparison result indicates unhealthy, determining that the health state of the high-voltage component to be monitored is unhealthy; and if the first comparison result, the second comparison result or the third comparison result indicates health, determining that the health state of the high-voltage component to be monitored is healthy.

Specifically, if the efficiency index value is smaller than the efficiency threshold value, the first comparison result indicates that the high-voltage component to be monitored is unhealthy; and if the efficiency index value is greater than or equal to the efficiency threshold value, the first comparison result indicates that the high-voltage component to be monitored is healthy. If the index value of the efficiency attenuation degree is greater than the threshold value of the efficiency attenuation degree, the second comparison result indicates that the high-voltage component to be monitored is unhealthy; if the index value of the efficiency attenuation degree is smaller than or equal to the threshold value of the efficiency attenuation degree, the second comparison result indicates that the high-voltage component to be monitored is healthy; if the index value of the efficiency decline gradient is greater than the threshold value of the efficiency decline gradient, the third comparison result indicates that the high-voltage component to be monitored is unhealthy; and if the index value of the efficiency decline gradient is smaller than or equal to the threshold value of the efficiency decline gradient, the third comparison result indicates that the high-voltage component to be monitored is healthy.

(13) When the number of the comparison results is a plurality of, if at least two comparison results indicate unhealthy, determining that the health state of the high-voltage component to be monitored is unhealthy; and if at most one comparison result shows that the high-voltage component is unhealthy, determining that the health state of the high-voltage component to be monitored is healthy.

In a specific implementation process, when the comparison result includes at least two of a first comparison result, a second comparison result and a third comparison result, if the at least two comparison results indicate unhealthy, determining that the health state of the high-voltage component to be monitored is unhealthy; and if at most one comparison result shows that the high-voltage component is unhealthy, determining that the health state of the high-voltage component to be monitored is healthy. That is, the comparison result is input into a multi-input single-output truth table, and the output of the truth table is the health evaluation result. The comparison result indicates true when unhealthy and false when healthy. The truth table may be set such that the output is true when at least two inputs are true, or else only 1 input is true, or all inputs are false, and the output is false.

Second kind:

(11) Determining a comparison of the index value to a threshold value of the health index; wherein the number of the comparison results is one or more, and when the number of the comparison results is a plurality of the comparison results, at least one comparison result is a designated comparison result;

(13) When the number of the comparison results is a plurality of, if at least one of all the specified comparison results indicates unhealthy, determining that the health state of the high-voltage component to be monitored is unhealthy; and if all the specified comparison results indicate health, determining that the health state of the high-voltage component to be monitored is healthy.

In a specific implementation process, at least one health index can be selected as an index for evaluating the health state of the high-voltage component to be monitored according to actual requirements, a comparison result corresponding to the health index indicates unhealthy, the high-voltage component to be monitored can be determined to be unhealthy, and when a comparison result corresponding to an unspecified health index indicates unhealthy, the comparison result corresponding to other health indexes is required to be referred to determine whether the high-voltage component to be monitored is unhealthy. That is, the comparison result is input into a multi-input single-output truth table, and the output of the truth table is the health evaluation result. The comparison result indicates true when unhealthy and false when healthy. The truth table may be set such that the output is true when at least one of the specified inputs is true, or false when at least one of the specified inputs is false.

According to the method for monitoring the high-voltage component of the vehicle, the current input power and the current output power of the high-voltage component to be monitored in a preset scene are obtained; determining a current efficiency value of the high-voltage component to be monitored according to the current input power and the current output power; generating an index value of the health index according to the current efficiency value; and determining the health state of the high-voltage component to be monitored according to the index value and the threshold value of the health index. Therefore, the process of acquiring the input power and the output power of the high-voltage component to be monitored can be simplified under a preset scene, and the current efficiency value of the high-voltage component to be monitored is obtained, and an index value for evaluating the health index of the health state of the high-voltage component to be monitored is generated, so that the health state of the high-voltage component to be monitored can be conveniently and rapidly obtained without considering the complicated electrical structure, mechanical structure, chemical structure and the like of the high-voltage component to be monitored, and the safety of a vehicle can be timely found and improved when the high-voltage component to be monitored is unhealthy.

Fig. 3 is a schematic flow chart of aging early warning by using the method for monitoring the high-voltage components of the vehicle. The process of performing the aging pre-warning on a certain high-voltage component can comprise the following steps:

Step 301, classifying scenes; such as the 13 types of scenes described above.

Step 302, obtaining and storing the offline test efficiency values of the component under different working conditions when the component is offline, for example, the offline test efficiency values can be stored in the Flash/ROM of the controller or NVRAM which is not lost when the component is offline, and providing a reference for index value calculation of the subsequent efficiency attenuation degree.

Step 303, distinguishing scenes in daily use after the delivery of the vehicle, respectively calculating efficiency values under preset scenes, and obtaining health index values; the calculation process of presetting the efficiency value in the scene and obtaining the index value of the health index may refer to the above related records, which will not be described herein. In fig. 3, the health index values are described by taking as an example the efficiency index value, the efficiency decay degree index value, the efficiency decline gradient index value, and other index values (which may be set according to actual demands and will not be described here).

Step 304, comparing the index value of each health index with each threshold value, and sending the index value into a multi-input single-output truth table; if the index value of the efficiency decay degree is higher than the corresponding threshold value, if the index value of the efficiency decline gradient is higher than the corresponding threshold value, if the efficiency index value is lower than the corresponding threshold value, if the other index values are higher or lower than the corresponding threshold values.

And 305, outputting an aging diagnosis result.

It should be noted that, although the foregoing embodiments describe the steps in a specific sequential order, it should be understood by those skilled in the art that, in order to achieve the effects of the present application, different steps need not be performed in such an order, and may be performed simultaneously (in parallel) or in other orders, and these variations are within the scope of protection of the present application.

It will be appreciated by those skilled in the art that the present application may implement all or part of the above-described methods according to the above-described embodiments, or may be implemented by means of a computer program for instructing relevant hardware, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of the above-described embodiments of the method when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable storage medium may include: any entity or device, medium, usb disk, removable hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunications signals, software distribution media, and the like capable of carrying the computer program code. It should be noted that the computer readable storage medium may include content that is subject to appropriate increases and decreases as required by jurisdictions and by jurisdictions in which such computer readable storage medium does not include electrical carrier signals and telecommunications signals.

Further, the application also provides a monitoring device for the high-voltage component of the vehicle.

Referring to fig. 4, fig. 4 is a main structural block diagram of a monitoring apparatus for a high-voltage component of a vehicle according to an embodiment of the present application. As shown in fig. 4, the monitoring apparatus of the vehicle high-voltage component in the embodiment of the present application may include a processor 41 and a storage device 42.

The storage device 42 may be configured to store a program for executing the method of monitoring the vehicle high-voltage component of the above-described method embodiment, and the processor 41 may be configured to execute the program in the storage device 42, including, but not limited to, the program for executing the method of monitoring the vehicle high-voltage component of the above-described method embodiment. For convenience of explanation, only those portions relevant to the embodiments of the present application are shown, and specific technical details are not disclosed, refer to the method portions of the embodiments of the present application. The monitoring device of the vehicle high-voltage component may be a control device formed by various electronic devices.

In one implementation, the number of memory devices 42 and processors 41 may be multiple. While the program for executing the method of monitoring the vehicle high voltage components of the above-described method embodiment may be divided into a plurality of sub-programs, each of which may be loaded and executed by the processor 41 to perform the different steps of the method of monitoring the vehicle high voltage components of the above-described method embodiment, respectively. Specifically, each of the sub-programs may be stored in a different storage device 42, and each of the processors 41 may be configured to execute the programs in one or more storage devices 42 to collectively implement the method for monitoring a vehicle high-voltage component of the above-described method embodiment, that is, each of the processors 41 executes different steps of the method for monitoring a vehicle high-voltage component of the above-described method embodiment, respectively, to collectively implement the method for monitoring a vehicle high-voltage component of the above-described method embodiment.

The plurality of processors 41 may be processors disposed on the same device, for example, the device may be a high-performance device composed of a plurality of processors, and the plurality of processors 41 may be processors disposed on the high-performance device. The plurality of processors 41 may be processors disposed on different devices, for example, the devices may be a server cluster, and the plurality of processors 41 may be processors on different servers in the server cluster.

The application also provides intelligent equipment, which comprises the monitoring equipment of the vehicle high-voltage component. The intelligent device may include a steering device, an autopilot vehicle, an intelligent car, a robot, an unmanned aerial vehicle, etc.

In some embodiments of the present application, the smart device further comprises at least one sensor for sensing information. The sensor is communicatively coupled to any of the types of processors referred to herein. Optionally, the intelligent device further comprises an automatic driving system, and the automatic driving system is used for guiding the intelligent device to drive by itself or assist driving. The processor communicates with the sensors and/or the autopilot system for performing the method of any one of the embodiments described above.

Further, the present application also provides a computer-readable storage medium. In one embodiment of a computer-readable storage medium according to the present application, the computer-readable storage medium may be configured to store a program for executing the method of monitoring a vehicle high-voltage component of the above-described method embodiment, which may be loaded and executed by a processor to implement the method of monitoring a vehicle high-voltage component described above. For convenience of explanation, only those portions relevant to the embodiments of the present application are shown, and specific technical details are not disclosed, refer to the method portions of the embodiments of the present application. The computer readable storage medium may be a storage device including various electronic devices, and optionally, in embodiments of the present application, the computer readable storage medium is a non-transitory computer readable storage medium.

Further, it should be understood that, since the respective modules are merely set to illustrate the functional units of the apparatus of the present application, the physical devices corresponding to the modules may be the processor itself, or a part of software in the processor, a part of hardware, or a part of a combination of software and hardware. Accordingly, the number of individual modules in the figures is merely illustrative.

Those skilled in the art will appreciate that the various modules in the apparatus may be adaptively split or combined. Such splitting or combining of specific modules does not lead to a deviation of the technical solution from the principles of the present application, and therefore, the technical solution after splitting or combining will fall within the protection scope of the present application.

It should be noted that, the personal information of the relevant user possibly related to each embodiment of the present application is personal information that is strictly according to requirements of laws and regulations, follows legal, legal and necessary principles, and processes the personal information actively provided by the user or generated by using the product/service in the process of using the product/service based on the reasonable purpose of the business scenario, and is obtained by the user through authorization.

The personal information of the user processed by the application may be different according to the specific product/service scene, and the specific scene that the user uses the product/service may be referred to as account information, equipment information, driving information, vehicle information or other related information of the user. The present application treats the user's personal information and its processing with a high diligence.

The method and the device have the advantages that safety of personal information of the user is very important, and safety protection measures which meet industry standards and are reasonable and feasible are adopted to protect the information of the user and prevent the personal information from unauthorized access, disclosure, use, modification, damage or loss.

Thus far, the technical solution of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will be within the scope of the present application.

Claims

1. A method of monitoring a high voltage component of a vehicle, comprising:

2. The method of monitoring a high-voltage component of a vehicle according to claim 1, wherein determining the health state of the high-voltage component to be monitored based on the index value and the threshold value of the health index comprises:

3. The method of monitoring a high-voltage component of a vehicle according to claim 1, wherein determining the health state of the high-voltage component to be monitored based on the index value and the threshold value of the health index comprises:

4. A method for monitoring a high-voltage component of a vehicle according to claim 2 or 3, characterized in that,

5. The method of monitoring a high-voltage component of a vehicle according to claim 4, wherein generating an index value of a health index based on the current efficiency value comprises:

6. The method for monitoring a high-voltage component of a vehicle according to claim 4, wherein,

7. The method for monitoring a high-voltage component of a vehicle according to claim 1, wherein the high-voltage component to be monitored includes a dc-dc converter;

8. The method for monitoring a high-voltage component of a vehicle according to claim 1, wherein the high-voltage component to be monitored includes a high-voltage drive motor;

The first mode includes:

the second mode includes:

9. The method for monitoring a high-voltage component of a vehicle according to claim 1, wherein the high-voltage component to be monitored includes a high-voltage drive motor;

the third mode includes:

the fourth aspect includes:

10. The method for monitoring a high-voltage component of a vehicle according to claim 1, wherein the high-voltage component to be monitored includes a vehicle-mounted charger;