CN106325265B - A kind of method for diagnosing faults of automobile body control module - Google Patents
A kind of method for diagnosing faults of automobile body control module Download PDFInfo
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- CN106325265B CN106325265B CN201610972480.7A CN201610972480A CN106325265B CN 106325265 B CN106325265 B CN 106325265B CN 201610972480 A CN201610972480 A CN 201610972480A CN 106325265 B CN106325265 B CN 106325265B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000003745 diagnosis Methods 0.000 claims abstract description 16
- 230000000630 rising effect Effects 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims description 7
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000003321 amplification Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The present invention relates to a kind of fault diagnosis circuit of automobile body control module and method, circuit includes and the concatenated sample resistance in relay contact end；VBAT provides power supply by relay for load；Operation amplifier circuit is connected at relay contact end and the midpoint of sample resistance；The output of operation amplifier circuit is connected with the port ADC of CPU, and the operating current for acquiring load carrys out the open-circuit fault or overload fault of decision circuitry；The output of operation amplifier circuit is connected with comparator circuit simultaneously；The output of comparator circuit is connected with the I/O port of CPU, and the short trouble of decision circuitry is carried out for capturing rising edge interruption.
Description
Technical field
The present invention relates to technical field of automotive electronics, are in particular the fault diagnosis circuits of automobile body control module
With method.
Background technique
In body of a motor car electronic system, there are car light, rain shaving electrical machine, Car window electric machine, backsight mirror motor, door-lock motors etc.
Various electronic loads, at present generally using smart power chip or the load of relay driving car light and motor load.
After short trouble occurs, smart power chip can trigger excess temperature shutdown protection before loading blown fuse, work as core
After piece temperature drops in normal range (NR), then the load of the turn on automatically road, if car body control module does not detect short circuit in time
Failure simultaneously turns off smart power chip, will cause smart power chip turn off repeatedly, connect the road load, chip be in always compared with
Under high operating temperature, the service life of smart power chip is reduced.It is different according to size of current when overload fault occurs,
The time of smart power chip triggering excess temperature shutdown protection can not determine, if car body control module does not detect to overload in time
Failure will also result in smart power chip and work under biggish electric current always before shutdown, can not only reduce intelligent power core
The service life of piece can also consume rapidly battery capacity, electricity is caused to exhaust and can not start engine.
In load driving circuits based on relay, if overload occurs for relay load and short trouble, electric current can be significantly
More than rated operational current, relay contact or electric current cabling is caused to be brought rapidly up, if do not detect in time overload and it is short
Road failure, will cause relay contact or electric current cabling is burned out, and car body control module is caused to damage or shot-firing circuit plate
Consequence.
Summary of the invention
The present invention to solve the above-mentioned problems, proposes fault diagnosis circuit and the side of a kind of automobile body control module
Method.
To achieve the goals above, the present invention uses following scheme:
A kind of fault diagnosis circuit of the automobile body control module based on relay, which is characterized in that including with relay
The concatenated sample resistance of device tip side；VBAT provides power supply by relay for load；In relay contact end and sample resistance
Midpoint connect operation amplifier circuit；The output of operation amplifier circuit is connected with the port ADC of CPU, for acquiring load
Operating current come the open-circuit fault or overload fault of decision circuitry；The output of operation amplifier circuit while and comparator circuit
It is connected；The output of comparator circuit is connected with the I/O port of CPU, and the short circuit event of decision circuitry is carried out for capturing rising edge interruption
Barrier.
The resistance value of the sample resistance is milliohm grade.
The amplification factor of the operational amplification circuit is (R1+R2)/R1.
The CPU carries out analog-to-digital conversion, according to the amplification factor computational load of analog-digital conversion result and operational amplification circuit
Operating current.
A kind of fault diagnosis circuit of the automobile body control module based on intelligent control chip, which is characterized in that including
With the sample resistance of the current feedback pin serial connection of intelligent control chip, connect in the midpoint of sample resistance and current feedback pin
The port ADC for meeting CPU, the operating current for acquiring load carry out the open-circuit fault or overload fault of decision circuitry；In sampling electricity
The midpoint of resistance and current feedback pin connects comparator circuit simultaneously；The output of comparator circuit is connected with the I/O port of CPU,
Carry out the short trouble of decision circuitry for capturing rising edge interruption.
The CPU carries out analog-to-digital conversion, is calculated according to the current feedback coefficient of analog-digital conversion result and intelligent control chip
The operating current of load.
In fault diagnosis circuit based on relay or the fault diagnosis circuit based on intelligent control chip, the comparator
The threshold voltage of circuit is set as 0.9 times of comparator reference voltage, when comparing voltage value is more than 0.9 times of comparator reference voltage
When, comparator exports high level；When comparing voltage value is lower than 0.9 times of comparator reference voltage, comparator exports low level.
A kind of method for diagnosing faults of automobile body control module, characterized by comprising:
When meeting load on-condition, connects load and simultaneously cycle timer is set, for periodically sampling load
Operating current；When switching off load, stops timer and stop the periodic samples to loaded work piece electric current.
After connecting load, setting starting time, the electric current detected during starting is only used for open-circuit fault diagnosis, no
It is diagnosed for overload fault.
During loading connection, if the I/O port of CPU captures rising edge interruption, comparator exports high level, it is believed that goes out
Existing short trouble；
During loading connection, if the loaded work piece electric current of continuous three second periodicity acquisition is zero, and the end IO of CPU
Mouth does not capture rising edge interruption, it is believed that open-circuit fault occurs；
After between on startup, if the loaded work piece electric current of continuous three second periodicity acquisition is all larger than twice of specified electricity
Stream, and the I/O port of CPU does not capture rising edge interruption, it is believed that there is overload fault.
After there is short trouble or overload fault, switching off load.
After there is short trouble, open-circuit fault or overload fault, corresponding fault message is stored.
Beneficial effects of the present invention:
(1) operating current of real-time monitoring load, according to the situation of change of load current and drive scheme type selecting, accurately
Judge overload fault, short trouble and open-circuit fault whether occurs；
(2) overload fault, short trouble and open-circuit fault are turned off in time and is protected；
(3) in the fault diagnosis circuit based on relay, sample resistance resistance value is very small, does not influence the driving energy in the channel
Power.
Detailed description of the invention
Fig. 1 is of the invention based on relay current detection circuit figure；
Fig. 2 is circuit failure diagnosis method flow chart of the invention.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
As shown in Figure 1, be the fault diagnosis circuit of the automobile body control module of the invention based on relay, including with
The concatenated sample resistance in relay contact end；VBAT provides power supply by relay for load；At relay contact end and sampling
The midpoint of resistance connects operation amplifier circuit；The output of operation amplifier circuit is connected with the port ADC of CPU, for acquiring
The operating current of load carrys out the open-circuit fault or overload fault of decision circuitry；The output of operation amplifier circuit while and comparator
Circuit is connected；The output of comparator circuit is connected with the I/O port of CPU, and the short circuit of decision circuitry is carried out for capturing rising edge interruption
Failure.
In order to make sample resistance have no substantial effect on the driving capability in the channel, Rs value very little is milliohm grade, sampling electricity
The amplification factor of pressure is (R1+R2)/R1, so that being sent into the voltage value of the port ADC under rated operational current as ADC module ginseng
Examine 1/15th or so of voltage VCC.
The operating current of relay load is calculated according to the analog-digital conversion result of ADC.The ADC precision of CPU is 10, ADC
Reference voltage VCC be 5V, it is assumed that loaded work piece electric current is I, and the result of ADC is that D(D is digital value between 0-1023), lead to
Cross the formula of ADC result computational load electric current are as follows:
I=(5 * R1 of D *)/(1024 * Rs * (R1+R2)) (1)
The threshold V T of comparator is generated by R5 and R6 partial pressure, VT is set as 0.9 times of VCC, and comparing voltage value is super
When crossing 0.9 times of VCC, comparator exports high level, it is believed that short trouble occurs；When lower than 0.9 times of VCC, comparator output
Low level.
Fault diagnosis circuit based on intelligent control chip, including the current feedback pin serial connection with intelligent control chip
Sample resistance carries out voltage sampling using current feedback pin of the sample resistance to smart power chip, is connected to the ADC of CPU
Port, the operating current for acquiring load carry out the open-circuit fault or overload fault of decision circuitry；It is anti-in sample resistance and electric current
The midpoint for presenting pin connects comparator circuit simultaneously；The output of comparator circuit is connected with the I/O port of CPU, using interruption side
Whether formula capture there is rising edge, and the short trouble of decision circuitry is carried out for capturing rising edge interruption.
According to the operating current of the analog-digital conversion result computational intelligence power chip of ADC.The ADC precision of CPU is 10,
The reference voltage of ADC is 5V, it is assumed that loaded work piece electric current is I, and the current feedback coefficient of smart power chip is K, sample resistance
Result for R, ADC is D, passes through the formula of ADC result computational load electric current are as follows:
I = (D * 5 ) / (1024 * R * K) (2)
In fault diagnosis circuit based on intelligent control chip, the threshold V T setting means of comparator be based on relay
The setting means of device scheme is identical, and VT is set as 0.9 times of VCC, when comparing voltage value is more than 0.9 times of VCC, comparator output
High level, it is believed that short trouble occur；When lower than 0.9 times of VCC, comparator exports low level.
Finally, proposing a kind of method for diagnosing faults of automobile body control module, comprising:
When meeting load on-condition, connects load and simultaneously cycle timer is set, for periodically sampling load
Operating current；When switching off load, stops timer and stop the periodic samples to loaded work piece electric current.
After connecting load, setting starting time, the electric current detected during starting is only used for open-circuit fault diagnosis, no
It is diagnosed for overload fault.
During loading connection, if the rising edge for capturing loaded work piece electric current interrupts, it is believed that short trouble occur；Shutdown
Load and store the short trouble of road load.
During loading connection, if the loaded work piece electric current of continuous three second periodicity acquisition is zero, and I/O port
On do not capture high level, it is believed that there is open-circuit fault and store the road load open-circuit fault；
After between on startup, if the loaded work piece electric current of continuous three second periodicity acquisition is all larger than twice of specified electricity
Stream, and high level is not captured on I/O port, it is believed that there is overload fault, switching off load and the overload for storing road load
Failure.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (3)
1. a kind of method for diagnosing faults of automobile body control module, characterized by comprising: when meeting load on-condition,
It connects and loads and cycle timer is set, for periodically sampling the operating current of load；When switching off load, stop timer
And stopping is to the periodic samples of loaded work piece electric current；
After connecting load, setting starting time, the electric current detected during starting is only used for open-circuit fault diagnosis, is not used in
Overload fault diagnosis；
During loading connection, if the I/O port of CPU captures rising edge interruption, comparator exports high level, it is believed that occurs short
Road failure；
During loading connection, if the loaded work piece electric current of continuous three second periodicity acquisition is zero, and the I/O port of CPU does not have
Capture rising edge interruption, it is believed that open-circuit fault occur；
After between on startup, if the loaded work piece electric current of continuous three second periodicity acquisition is all larger than twice of rated current, and
And the I/O port of CPU does not capture rising edge interruption, it is believed that overload fault occurs.
2. according to the method described in claim 1, it is characterized by: after there is short trouble or overload fault, switching off load.
3. according to the method described in claim 1, it is characterized in that being deposited after there is short trouble, open-circuit fault or overload fault
Store up corresponding fault message.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610972480.7A CN106325265B (en) | 2016-10-27 | 2016-10-27 | A kind of method for diagnosing faults of automobile body control module |
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| CN201610972480.7A CN106325265B (en) | 2016-10-27 | 2016-10-27 | A kind of method for diagnosing faults of automobile body control module |
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| CN106325265A CN106325265A (en) | 2017-01-11 |
| CN106325265B true CN106325265B (en) | 2019-01-22 |
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| CN109143113B (en) * | 2018-07-24 | 2021-11-09 | 郑州云海信息技术有限公司 | Method, device and system for monitoring power supply of PCIE external plug-in card |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0847158A (en) * | 1994-07-27 | 1996-02-16 | Matsushita Electric Ind Co Ltd | Short-circuit |
| KR100575610B1 (en) * | 1999-08-18 | 2006-05-03 | 매그나칩 반도체 유한회사 | Port circuit |
| CN201571033U (en) * | 2009-12-25 | 2010-09-01 | 中国电子科技集团公司第四十研究所 | Solid state power controller |
| CN102635564A (en) * | 2012-02-27 | 2012-08-15 | 石家庄市公共交通总公司 | Air-conditioning blower control system of natural gas bus |
| CN203596599U (en) * | 2013-11-13 | 2014-05-14 | 北京光景照明设计有限公司 | Digital direct-current circuit breaker |
| CN203838302U (en) * | 2013-11-30 | 2014-09-17 | 芜湖国睿兆伏电子有限公司 | Fault detection system for charge-discharge circuit |
| CN206133303U (en) * | 2016-10-27 | 2017-04-26 | 山东省科学院自动化研究所 | Car body control module's failure diagnosis circuit |
-
2016
- 2016-10-27 CN CN201610972480.7A patent/CN106325265B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0847158A (en) * | 1994-07-27 | 1996-02-16 | Matsushita Electric Ind Co Ltd | Short-circuit |
| KR100575610B1 (en) * | 1999-08-18 | 2006-05-03 | 매그나칩 반도체 유한회사 | Port circuit |
| CN201571033U (en) * | 2009-12-25 | 2010-09-01 | 中国电子科技集团公司第四十研究所 | Solid state power controller |
| CN102635564A (en) * | 2012-02-27 | 2012-08-15 | 石家庄市公共交通总公司 | Air-conditioning blower control system of natural gas bus |
| CN203596599U (en) * | 2013-11-13 | 2014-05-14 | 北京光景照明设计有限公司 | Digital direct-current circuit breaker |
| CN203838302U (en) * | 2013-11-30 | 2014-09-17 | 芜湖国睿兆伏电子有限公司 | Fault detection system for charge-discharge circuit |
| CN206133303U (en) * | 2016-10-27 | 2017-04-26 | 山东省科学院自动化研究所 | Car body control module's failure diagnosis circuit |
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| CN106325265A (en) | 2017-01-11 |
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Effective date of registration: 20231130 Address after: 2518 Jining Zhongguancun Information Valley Innovation Center, No. 69 Haichuan Road, Wangyin Street, High tech Zone, Jining City, Shandong Province, 272199 Patentee after: Shandong Xinkong Intelligent Technology Co.,Ltd. Address before: 250014 No. 19, ASTRI Road, Lixia District, Shandong, Ji'nan Patentee before: INSTITUTE OF AUTOMATION, SHANDONG ACADEMY OF SCIENCES |
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