CN109542086A - Data calibration method - Google Patents
Data calibration method Download PDFInfo
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- CN109542086A CN109542086A CN201811435125.1A CN201811435125A CN109542086A CN 109542086 A CN109542086 A CN 109542086A CN 201811435125 A CN201811435125 A CN 201811435125A CN 109542086 A CN109542086 A CN 109542086A
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- 238000013507 mapping Methods 0.000 claims abstract description 26
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- 230000004048 modification Effects 0.000 claims description 5
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- 238000011161 development Methods 0.000 abstract description 10
- 239000000047 product Substances 0.000 description 12
- 230000018109 developmental process Effects 0.000 description 8
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0221—Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a data calibration method, which adopts a product ECU to calibrate data, divides an RAM space of the product ECU into a plurality of sections, simultaneously divides a flash space of the calibrated data into a plurality of sections with the same space size, then establishes a mapping relation between each section of space in the RAM and each section of space of the flash, sequentially loads the section of space of the calibrated data into the RAM in sections according to the section of space in the flash of the data when calibrating the data, and then calibrates the data. The invention has the advantages that: the product ECU replaces a development ECU to realize data calibration, so that the development cost of a project can be greatly saved, and the cost is saved; the method is simple to implement, and can be realized only by mapping the XCP calibration page through a dynamic mapping method.
Description
Technical field
The present invention relates to vehicle electric control field, in particular to the method for data scaling in automobile electrically-controlled development process.
Background technique
With increasingly strict, the car engine of continuous improvement and discharge fuel economy regulation of the automobile on dynamic property, comfort
Machine ECU internal control software also becomes increasingly complex.The quantity of parameter inside engine diagnostic function and ECU is also constantly increasing
Long, the variable that this just needs to need to demarcate in exploitation calibration phase is also more and more.Therefore the vehicle electronic development stage in order to
Staking-out work is completed, main engine plants and EFI producer will use exploitation ECU to carry out the staking-out work of data.Develop ECU and product
ECU is completely compatible on single-chip microcontroller pin and function, but possesses ram spaces more more than product E CU, can meet automatically controlled mark
Determine development phase demand.But since the single-chip microcontroller of exploitation ECU is expensive and demand is small, single cost is very expensive, city
Valence is generally at 30,000 yuan or so, and the price of a product E CU only needs 300 yuan or so.So if can be replaced by product E CU
In generation, develops ECU to realize data scaling, then can greatly save project development cost.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of data scaling methods, for using more
Cheap product E CU realizes that the development phase demarcates the variable of automobile ECU.
To achieve the goals above, the technical solution adopted by the present invention are as follows: a kind of data scaling method, using product E CU
Data scaling is carried out, the ram space of product E CU is divided into several segments, while with same space size by nominal data
The space flash is divided into several sections, then establishes the mapping relations in RAM between each section of space in each section of space and flash, when into
When row data scaling, according to the section space in flash where data, the section space where nominal data is successively segmented and is loaded into
In RAM, staking-out work is then carried out again.
Mapping relations establish 8 TLB of the memory mapping block MMU including the use of product E CU, will be in scalar quantity flash
8 logical address regions be respectively mapped to 8 sections in RAM according to applicable cases, and other non-mapped flash are kept
Global mapping before remains as the address of flash itself.
When being demarcated using calibration facility to ECU, calibration facility and ECU establish connection and have secure access to and pass through it
Afterwards, it needs section where the data demarcated will to be needed to be mapped to ram space by calibration page select command, when data scaling is completed
Afterwards, the data of calibration are saved using download command into Flash.
Firstly, completing the memory mapping that MMU needs to be mapped to 8 TLB of RAM in XCP initialization function, and one fixed
Variable characterizes each section in RAM of use state, defines another variable to characterize the flash mapped section；
When calibration facility, which sends SET_CAL_PAGE order, carrys out modification page, current selected is reference page, then leads to
It crosses TLB entry and maps the address into the space in flash, and check whether working page is consistent with the content of reference page, if
Data unanimously indicate that calibration is completed；If selection is working page, need to confirm whether 8 pages of current RAM are available free, such as
The flash space address for needing the data demarcated then is mapped as ram space address by the available free ram space of fruit, and is started just
Normal staking-out work process, if ram space not can be carried out the calibration of new data without the free time；
After the completion of staking-out work, calibration facility sends DOWN_LOAD order to save the data of calibration, and ECU is received
It after order, checks whether the section of current data has been mapped in RAM, if mapped, directly the data of calibration is written
It in RAM, if not yet mapped, needs to check the whether available free space RAM, can be incited somebody to action if the available free space RAM
The data of calibration are stored in RAM, are waited calibration that RAM is written after the completion, are finished if RAM is occupied, need to wait other numbers
According to calibration completion exit after, can just continue the calibration of new data, to be gradually completing staking-out work.
The product E CU is used to be realized on Freescale MPC5634 monolithic machine platform.
Calibration RAM space is divided into 8 sections as unit of 4K, the space flash is divided into 24 sections as unit of 4K, then built
Vertical mapping relations.
The product E CU is that engine controls ECU.
The present invention has the advantages that replacing exploitation ECU to realize data scaling by product E CU, item can be greatlyd save
Purpose development cost, save the cost；And realize simple, it is only necessary to XCP be carried out by the method for dynamic mapping and demarcate reflecting for page
Penetrating can be realized.
Detailed description of the invention
Below to each width attached drawing of description of the invention expression content and figure in label be briefly described:
Fig. 1 is nominal data mapping relations schematic diagram of the present invention；
Fig. 2 is present invention calibration message flow chart.
Specific embodiment
A specific embodiment of the invention is made further detailed below against attached drawing by the description to optimum embodiment
Thin explanation.
Exploitation ECU is replaced to carry out variable calibration using product E CU, this method is in Freescale MPC5634 monolithic machine platform
Upper realization (other chip microcontroller methods are same).This single-chip microcontroller ram space total size is 92K, but general engine
It is about 90K that project, which needs the variable space demarcated, if realizing nominal data in the Complete Mappings of RAM, scalar quantity is to RAM resource
It consumes excessive, influences whether operation of the other applications in RAM, be infeasible.In this method, by the sky of nominal data
Between be divided into several segments, when carrying out on-line proving, first by where scalar quantity section segmentation be loaded into RAM, then carry out again
Staking-out work.
In this method, address range of the variable for needing to demarcate in flash is: 0x00160000-0x00178000, greatly
Small is 96K, and the address range being mapped in RAM is 0x40000000-0x40008000, size 32K, will not be occupied so very
More ram spaces will not influence the normal operation of other programs.According to the design in this method, by Calibration RAM space with
4K is that unit is divided into 8 sections, and the space flash is equally divided into 24 sections, mapping relations such as Fig. 1 as unit of 4K.
Calibration access is divided into working page and reference page, and working page, that is, ram space can carry out direct read-write behaviour to data
Make, reference page, that is, space flash is read-only to be write, therefore general staking-out work process is, the data that needs are demarcated from
Flash is copied in RAM, after staking-out work is completed, in being written to flash, to complete staking-out work.
As shown in Figure 1,8 TLB of MMU (memory mapping) module using MPC5634 chip, it will be in scalar quantity flash
8 logical address regions be respectively mapped to 8 sections in RAM according to applicable cases, and other non-mapped regions flash
It is whole that the region flash is mapped to using a TLB.
When being demarcated using calibration facility to ECU, by Fig. 2 be demarcation flow schematic diagram, Cong Tuzhong message flow it is found that
Calibration facility and ECU establish connection and have secure access to pass through after, need by calibration page selection (SET_CAL_PAGE) order
The data of calibration are mapped to ram space, after the completion of data scaling, are ordered using downloading (DOWN_LOAD) to save calibration
Data into Flash, therefore this method by modification calibration page selection (SET_CAL_PAGE) order and downloading (DOWN_
LOAD) the operation ordered, to complete the realization of this method, the method is as follows:
Step 1: firstly, the memory mapping that MMU needs to be mapped to 8 TLB of RAM is completed in XCP initialization function, and
A variable is determined to characterize each section in RAM of use state, defines another variable to characterize the flash mapped section；
Step 2: when calibration facility, which sends SET_CAL_PAGE order, carrys out modification page, if not using this method
Dynamic mapping then directly arrives Flash Address space mappinD when receive current selected is working page or reference page order
The space RAM or Flash, and be that current selected is reference page for the function operation process of this method dynamic calibration, then pass through
TLB entry maps the address into the space in flash, and checks whether working page is consistent with the content of reference page, if number
Indicate that calibration is completed according to consistent；If selection is working page, need to confirm whether 8 pages of current RAM are available free, if
The flash space address for needing the data demarcated then is mapped as ram space address by available free ram space, and is started normal
Staking-out work process, if ram space without free time, not can be carried out the calibration of new data.
Step 3；After the completion of staking-out work, calibration facility sends DOWN_LOAD order to save the data of calibration, ECU
After receiving order, check whether the section of current data has been mapped in RAM, if mapped, directly the number of calibration
According in write-in RAM, if not yet mapped, need to check the whether available free space RAM, if the available free space RAM
The data of calibration can be stored in RAM, wait calibration that RAM is written after the completion, be finished, need if RAM is occupied
After the calibration completion of other data is exited, it can just continue the calibration of new data, to be gradually completing staking-out work.
The method of dynamic calibration page realizes the method that product E CU carries out variable calibration, and disadvantage is exactly once can only be to certain
The parameter of quantity completes calibration, when selected argument address is more dispersed, after 8 mapped segments that RAM is distributed have used
Need multi-pass operation that could complete staking-out work.But cost can be greatlyd save, for exploitation enterprise in project development
And its it is advantageous.
In order to verify this method, modified software is tested by INCA and debugging tool, is selected by INCA
Variable in fixed such as table 3,
| Variable name | Numerical value before demarcating |
| VAL_AftrunEEPROM | 1 |
| VAL_AngAbsCamCrkLm | 15.000 |
Table 3
Not demarcated due to data in ECU at this time, MMU mapping table does not map, and all holding initial values are mapped to one
A not used space, MMU initial value are corresponding such as table 1.
| Enter slogan | Physical address | Logical address |
| Entry4-11 | 0x3000000 | 0x30000000 |
Table 1
When modifying VAL_AftrunEEPROM and VAL_AngAbsCamCrkLm numerical value, mapping table changes such as table 2,
| Enter slogan | Physical address | Logical address |
| Entry4 | 0x40000000 | 0x00162000 |
| Entry5 | 0x40001000 | 0x00173000 |
| Entry6-11 | 0x30000000 | 0x30000000 |
Table 2
The address that VAL_AftrunEEPROM variable is checked by MAP is 0x00162dc0, VAL_AngAbsCamCrkLm
The address of variable is 0x001730ae, therefore entrance 4 is the mapping to VAL_AftrunEEPROM, and entrance 5 is to VAL_
The mapping of AngAbsCamCrkLm variable, two variables are a to occupy a mapping entrance since address is more dispersed, this
When INCA in numerical value complete modification, such as table 4.
| Variable name | Numerical value after calibration |
| VAL_AftrunEEPROM | 2 |
| VAL_AngAbsCamCrkLm | 18.000 |
Table 4
Can be seen that the method by INCA software debugging result may be implemented the dynamic mapping that XCP demarcates page, realize
Calibrating function can greatly save project development expense to be truly realized the function of product E CU substitution exploitation ECU.
Obviously present invention specific implementation is not subject to the restrictions described above, as long as using method concept and skill of the invention
The improvement for the various unsubstantialities that art scheme carries out, it is within the scope of the present invention.
Claims (7)
1. a kind of data scaling method, it is characterised in that: data scaling is carried out using product E CU, by the ram space of product E CU
It is divided into several segments, while the space flash of nominal data is divided by several sections with same space size, then establishes RAM
In mapping relations between each section of space in each section of space and flash, when carrying out data scaling, according in flash where data
Section space, the section space where nominal data is successively segmented and is loaded into RAM, then carries out staking-out work again.
2. a kind of data scaling method as described in claim 1, it is characterised in that: mapping relations are established including the use of product
8 TLB of the memory mapping block MMU of ECU distinguish 8 logical address regions in scalar quantity flash according to applicable cases
8 sections being mapped in RAM, and other non-mapped flash region entireties are mapped to the region flash using a TLB.
3. a kind of data scaling method as claimed in claim 1 or 2, it is characterised in that: when use calibration facility carries out ECU
When calibration, after calibration facility and ECU establish connection and have secure access to and pass through, need calibration through calibration page select command
Data are mapped to ram space, and after the completion of data scaling, the data of calibration are saved using download command into Flash.
4. a kind of data scaling method a method according to any one of claims 1-3, it is characterised in that: firstly, in XCP initialization function
Middle completion MMU needs to be mapped to the memory mapping of 8 TLB of RAM, and determines a variable to characterize each section in RAM of use
State defines another variable to characterize the flash mapped section；
When calibration facility, which sends SET_CAL_PAGE order, carrys out modification page, current selected is reference page, then passes through TLB
Entry maps the address into the space in flash, and checks whether working page is consistent with the content of reference page, if data one
It causes to indicate that calibration is completed；If selection is working page, need to confirm whether 8 pages of current RAM are available free, if free
The flash space address for needing the data demarcated then is mapped as ram space address by not busy ram space, and starts normal mark
Workflow is determined, if ram space not can be carried out the calibration of new data without the free time；
After the completion of staking-out work, calibration facility sends DOWN_LOAD order to save the data of calibration, and ECU receives order
Afterwards, check whether the section of current data has been mapped in RAM, if mapped, directly in the data write-in RAM of calibration
It goes, if not yet mapped, needs to check the whether available free space RAM, it can be by calibration if the available free space RAM
Data are stored in RAM, are waited calibration that RAM is written after the completion, are finished if RAM is occupied, need to wait the mark of other data
It is fixed to complete after exiting, it can just continue the calibration of new data, to be gradually completing staking-out work.
5. a kind of data scaling method as described in claim 1-4 is any, it is characterised in that: the product E CU is thought using winged
It is realized on karr MPC5634 monolithic machine platform.
6. a kind of data scaling method as described in claim 1-4 is any, it is characterised in that: be with 4K by Calibration RAM space
Unit is divided into 8 sections, and the space flash is divided into 24 sections as unit of 4K, then establishes mapping relations.
7. a kind of data scaling method as described in claim 1, it is characterised in that: the product E CU is engine control
ECU。
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| CN201811435125.1A CN109542086A (en) | 2018-11-28 | 2018-11-28 | Data calibration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112732309A (en) * | 2021-01-14 | 2021-04-30 | 潍柴动力股份有限公司 | Updating method and device of Flash memory and electronic equipment |
| CN112765053A (en) * | 2021-01-04 | 2021-05-07 | 潍柴动力股份有限公司 | Data processing method and device |
-
2018
- 2018-11-28 CN CN201811435125.1A patent/CN109542086A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112765053A (en) * | 2021-01-04 | 2021-05-07 | 潍柴动力股份有限公司 | Data processing method and device |
| CN112732309A (en) * | 2021-01-14 | 2021-04-30 | 潍柴动力股份有限公司 | Updating method and device of Flash memory and electronic equipment |
| CN112732309B (en) * | 2021-01-14 | 2023-08-18 | 潍柴动力股份有限公司 | Flash memory updating method and device and electronic equipment |
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Application publication date: 20190329 |