阅读说明：本技术 一种汽车48v电源转换器电压电流下线检测和标定方法 (Voltage and current offline detection and calibration method for automobile 48V power converter ) 是由 张智群 张�杰 张智坤 于 2021-07-21 设计创作，主要内容包括：本发明公开了一种汽车48V电源转换器电压电流下线检测和标定方法,包括以下步骤：采样阶段、数据传输阶段、数据对比阶段、数据判断阶段、S4.1阶段和S4.2阶段,通过这些步骤,能够对汽车生产线上的零部件产品采用电源转换器电压电流采样,能够比较快速有效的对量产的汽车零部件进行数据采样,从而进行数据判断,当采样的结果超出规定的误差范围,则表明汽车零部件之间的来料一致性超出规定的偏差范围,不利于汽车零部件在功能性方面保持一致性,当结果未超出固定的误差范围内,则表明汽车零部件之间的来料一致性未超出规定的偏差范围,从而便于提高量产的汽车零部件在功能性方面的一致性,把控汽车零部件的质量,提高汽车零部件的质量。(The invention discloses a voltage and current offline detection and calibration method for an automobile 48V power converter, which comprises the following steps: the method comprises a sampling stage, a data transmission stage, a data comparison stage, a data judgment stage, an S4.1 stage and an S4.2 stage, wherein through the steps, the voltage and the current of a power converter can be adopted for sampling parts on an automobile production line, the data of mass-produced automobile parts can be rapidly and effectively sampled, so that the data judgment is carried out, when the sampling result exceeds a specified error range, the consistency of the incoming materials among the automobile parts is indicated to exceed the specified deviation range, the consistency of the incoming materials among the automobile parts is not favorably kept in the aspect of functionality of the automobile parts, and when the result does not exceed the fixed error range, the consistency of the incoming materials among the automobile parts is indicated to not exceed the specified deviation range, so that the consistency of the mass-produced automobile parts in the aspect of functionality is improved, the quality of the automobile parts is controlled, and the quality of the automobile parts is improved.)

1. A voltage and current offline detection and calibration method for an automobile 48V power converter is characterized by comprising the following steps: the method comprises the following steps:

s1, in the sampling stage, after the software burning and the product assembly of the power converter product are completed, in the offline detection link, the power converter product samples the input voltage at the side of 48V, the output voltage at the side of 12V and the output current at the side of 12V;

s2, in the data transmission stage, sending corresponding sampling data to an EOL upper computer on an industrial personal computer through CAN communication;

s3, in a data comparison stage, comparing sampling data read by the EOL upper computer through the CAN with corresponding data sampled by an EOL upper computer instrument;

s4, judging whether the sampled data of the power converter is in a specified error range in a data judging stage;

s4.1, if the sampled data exceeds the error range, calibrating the sampled parameters of the corresponding voltage and current of the power converter software, and updating the finally optimized parameters into the power converter product;

and S4.2, if the error range is not exceeded, no processing is carried out.

2. The voltage and current offline detection and calibration method for the automobile 48V power converter according to claim 1, characterized in that: in the step S1, the power converter product samples the voltage and current through the linear sensor, and converts the AD value x sampled by the sensor into the actual physical value y through a software formula, where the formula can be described as y-K0 x + B0, and K0 and B0 are the slope and the offset in the sampled parameters, respectively.

3. The voltage and current offline detection and calibration method for the automobile 48V power converter according to claim 1, characterized in that: in step S2, the EOL host computer may Read out the real DID $22 service in the UDS respectively for being used as the initial values of the calibration parameters.

4. The voltage and current offline detection and calibration method for the automobile 48V power converter according to claim 1, characterized in that: in the step S3, the calibration optimization of the parameters is based on a two-point linear interpolation algorithm, the power converter and the EOL instrument respectively sample 2N test points, each two test points are a set of sampled data, N sets of k and b values can be obtained through the two-point linear interpolation algorithm, and then the values are respectively averaged to finally obtain the optimized calibration parameters Kc and Bc.

5. The voltage and current offline detection and calibration method for the automobile 48V power converter according to claim 1, characterized in that: in the step S4, the calibrated sampling parameters are written into the RAM of the power converter through UDS write DID $2E, the test points are repeatedly set, the comparison between the sampling value of the power converter and the measurement value of the EOL upper computer instrument is observed, if the comparison result is within the error range, the parameters in the RAM are updated into Flash through Save DID of UDS route control $31, and finally the parameters in Flash and RAM are checked to be consistent through Check DID of UDS route control $ 31.

Technical Field

The invention relates to the field of automobile hybrid systems, in particular to a voltage and current offline detection and calibration method for an automobile 48V power converter.

Background

With the increasingly strict requirements of the automobile industry on carbon emission reduction, the technical scheme of the 48V light mixing system with extremely high cost performance is greatly concerned as a practical and effective technical route. As an important core part for energy conversion and transmission of a 48V light mixing system, a 48V power converter converts input end direct current 48V level electric energy into 12V level electric energy to supply power to a 12V lead-acid storage battery and a vehicle-mounted electric appliance, and offline detection refers to detection of key functions of products on an automobile part production line before offline, so that controllability of mass production products in the aspect of function consistency is improved.

Disclosure of Invention

The invention mainly aims to provide a method for detecting and calibrating voltage and current offline of a 48V power converter of an automobile, which can effectively solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the technical scheme that:

a voltage and current offline detection and calibration method for an automobile 48V power converter comprises the following steps:

s1, in the sampling stage, after the software burning and the product assembly of the power converter product are completed, in the offline detection link, the power converter product samples the input voltage at the side of 48V, the output voltage at the side of 12V and the output current at the side of 12V;

s2, in the data transmission stage, sending corresponding sampling data to an EOL upper computer on an industrial personal computer through CAN communication;

s3, in a data comparison stage, comparing sampling data read by the EOL upper computer through the CAN with corresponding data sampled by an EOL upper computer instrument;

s4, judging whether the sampled data of the power converter is in a specified error range in a data judging stage;

s4.1, if the sampled data exceeds the error range, calibrating the sampled parameters of the corresponding voltage and current of the power converter software, and updating the finally optimized parameters into the power converter product;

and S4.2, if the error range is not exceeded, no processing is carried out.

Preferably, in step S1, the power converter product samples the voltage and current through the linear sensor, and converts the AD value x sampled by the sensor into the actual physical value y through a formula, where the formula can be described as y ═ K0 × x + B0, and K0 and B0 are the slope and offset in the sampled parameters, respectively.

Preferably, in step S2, the EOL host computer can Read out the signals respectively through Read DID $22 service in UDS, and use the signals as initial values of calibration parameters.

Preferably, in the step S3, the calibration optimization of the parameters is based on a two-point linear interpolation algorithm, the power converter and the EOL instrument respectively sample 2N test points, each two test points are a set of sampled data, N sets of k and b values can be obtained through the two-point linear interpolation algorithm, and then the average values are respectively obtained, so as to finally obtain the optimized calibration parameters Kc and Bc.

Preferably, in step S4, the calibrated sampling parameters are written into the RAM of the power converter through UDS write DID $2E, the test points are repeatedly set, the sampled values of the power converter are observed to be compared with the measured values of the EOL upper computer instrument, if the comparison result is within the error range, the parameters in the RAM are updated into Flash through Save DID of UDS route control $31, and finally the parameters in Flash and RAM are checked to be consistent through Check DID of UDS route control $ 31.

Compared with the prior art, the voltage and current offline detection and calibration method for the automobile 48V power converter can effectively improve the functional controllability of mass production products of automobile parts, reduce the difference between the parts, avoid the appearance of defective products and improve the product quality.

Drawings

FIG. 1 is a diagram of the recovery steps of the voltage and current offline detection and calibration method of the 48V power converter of the vehicle.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1, a method for detecting and calibrating voltage and current offline of a 48V power converter of an automobile includes the following steps:

s1, in the sampling stage, after the software burning and the product assembly of the power converter product are completed, in the offline detection link, the power converter product samples the input voltage at the side of 48V, the output voltage at the side of 12V and the output current at the side of 12V;

s2, in the data transmission stage, sending corresponding sampling data to an EOL upper computer on an industrial personal computer through CAN communication;

s3, in a data comparison stage, comparing sampling data read by the EOL upper computer through the CAN with corresponding data sampled by an EOL upper computer instrument;

s4, judging whether the sampled data of the power converter is in a specified error range in a data judging stage;

s4.1, if the sampled data exceeds the error range, calibrating the sampled parameters of the corresponding voltage and current of the power converter software, and updating the finally optimized parameters into the power converter product;

and S4.2, if the error range is not exceeded, no processing is carried out.

In step S1, the power converter product samples the voltage and current through the linear sensor, and converts the AD value x sampled by the sensor into the actual physical value y through a formula, where the formula can be described by y-K0 x + B0, and K0 and B0 are the slope and offset in the sampled parameters, respectively; in the step of S2, the EOL upper computer can Read the Read DID $22 service in the UDS respectively to serve as an initial value of a calibration parameter; in the step S3, the calibration optimization of the parameters is based on a two-point linear interpolation algorithm, the power converter and the EOL instrument respectively sample 2N test points, each two test points are a set of sampled data, N sets of k and b values can be obtained by the two-point linear interpolation algorithm, and then the values are respectively averaged to finally obtain the optimized calibration parameters Kc and Bc; in the step S4, the calibrated sampling parameters are written into the RAM of the power converter through UDS write DID $2E, the test points are repeatedly set, the comparison between the sampling value of the power converter and the measurement value of the EOL upper computer instrument is observed, if the comparison result is within the error range, the parameters in the RAM are updated into Flash through Save DID of UDS route control $31, and finally the parameters in Flash and RAM are checked to be consistent through Check DID of UDS route control $ 31.

It should be noted that, the present invention is a method for detecting and calibrating voltage and current of a 48V Power converter of an automobile under line, when the voltage on the high-voltage side is detected and calibrated, the voltage on the high-voltage side is normalized by the following steps, the first step is to terminate the high-voltage side with the Power supply, the low-voltage side is unloaded, the Power converter is powered on, and is set to idle mode, the second step is to read the original calibration parameters k0, b0(UHVSlopeC, UHVOffsetC) through the UDS 22 service, the third step is to set the voltage values 24V, 30V, 36V, 42V, 48V, 54V through the Power source, and simultaneously read the voltage values on the high-end side of the CAN, the fourth step is to calculate 3 k values and b values with 24V/42V, 30V/48V, 36V/54V as a set, the average value Ck, Cb, the new calibration parameter k1 ═ Ck 0, b1 ═ b + Ck + cn, Cb ═ k, 0, Cb ═ 5632 b-type data, ck and Cb are both float type data, which CAN be positive or negative, and data type conversion needs to be done, the fifth step, new k1, b1(k1 is u16 type data, b1 is s16 type data) are written into RAM through UDS 2E service, then power source voltage values are set to 24V, 30V, 36V, 42V, 48V and 54V, whether the error of the high-end voltage value read on CAN is about 0.5V or not is verified, the sixth step is carried out, if the error exceeds the allowed voltage error (0.3V), the third step, the fourth step and the fifth step are repeated, if the error is within 0.2V, the parameters in RAM are written into flash through UDS 31F000 service, thus the correct parameters are permanently stored in the power converter, when standard detection and calibration are carried out on ULV, the steps are as follows, the first step, low voltage source is terminated, high voltage end is not connected with power converter, setting to idle mode, reading original calibration parameters k0, b0 (ults local, ultvoffsetc) through UDS 22 service, setting voltage values of Power source to 8.5V, 9.5V, 10.5V, 11.5V, 12.5V, 13.5V, 14.5V, and 15.5V, simultaneously reading low-end voltage values on CAN, and setting Power source to 4 k values and b values calculated as a set of 8.5V/12.5V, 9.5V/13.5V, 10.5/14.5V, and 11.5V/15.5V, averaging, Cb, setting new calibration parameters k1 to Ck 0, b1 to b0 Ck + Cb N, k0 to type data 16, b 733 to type c k, c 3 to type c k + Cb 84, and converting data to positive type cr 38, c 42 k to type cr 52, c 38 k to type c 42V, and b1 to type cr 32V, and setting data to positive cr 32 k to 80V, c 42 k to type cr 32V, c 42 k to convert data into new format c 38 k, c 38 k to type cr 32V, c 42 b 84, c 42 k to type cr 32V, c 3 k to convert data, c 42V, c 3 k to type r, c 80V + c 3 k to convert new calibration parameters, c 3 k to type c 2, c 3 k to type c 2, c 3 k to get new format r, c 3 k to get new format r, c 2 h, c 3 k to type c 2, c 3 k to type r, c 3 k to get new format r 4E 22 h, c 3 k to type c 2 r, c 3 k to be written to type c 7 h, c 3 k to type r, c 2 r, c 3 h, c 2 r, c 3 k to type r, c 2 r, c 3 r, c 2 r, c 3 r d b r, c 3 r b 3 r d to get c 2 r, c 3 r d b r, c 3 r, c 2 r, c 3 r d b 3 r, c 3 r d b 3 r, c 2 r d b r, c 3 r d b r, c 3 r d b r c 3 r, c 3 r d b r, c 3 r d b r, c 2 r d b r d b r, c 3 r d b r c 2 r d b r d, 9.5V, 10.5V, 11.5V, 12.5V, 13.5V, 14.5V, 15.5V, verifying if the error of the low-side voltage value read on CAN is around 0.1V, sixth step, if the error exceeds the allowed voltage error (0.2V), repeating the third step, the fourth step and the fifth step, if the error is within 0.1V, writing the parameters in RAM into flash through UDS 31F000 service, thus permanently storing the correct parameters in the power converter, when standard detection and calibration are performed on ILV, the first step, high-voltage terminal powersource is set to 48V, low-voltage terminal CC 10A load, power-up of the power converter, setting UREG _ REQ in _ CTRL frame in the power converter to 14V, IMAX to 130A, then setting to buuds mode, the third step, calibration parameters read through UDS 22 service, vstk 0, vtpeb 0, and ilpoc, setting the electronic loads as CC 10A, 20A, 30A, 40A, 50A, 60A, 70A, 80A, 90A, 100A, 110A, 120A, reading the low-end current value on CAN, calculating 6 k values and b values for a group by 10A/70A, 20A/80A, 30A/90A, 40A/100A, 50A/110A, 60A/120A, calculating average Ck, Cb, ensuring less error when large current flows, properly increasing the weight of k values of 50A/110A, 60A/120A when k and b are averaged, setting new calibration parameters k1 k0, b1 b 25 Ck + Cb N, k0 u16 type data, b0 s16 type data, Ck type Cb and Cb 0 are all types of float data, Cb 0 CAN be positive, conversion of data is needed, and the fifth step 1 is done, b1(k1 is data of u16 type, b1 is data of s16 type), the data are written into the RAM through UDS 2E service, the electronic loads are set to be CC 10A, 20A, 30A, 40A, 50A, 60A, 70A, 80A, 90A, 100A, 110A and 120A, whether the error of the low-end voltage value read on the CAN is about 1A or not is verified, the sixth step is carried out, if the error exceeds the allowable range 3A, the third step, the fourth step and the fifth step are repeated, if the error is within 3A, the parameters in the RAM are written into the flash through UDS 31F000 service, and therefore the correct parameters are stored in the power converter permanently.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.