CN103399250A - Method and system for diagnosing open-circuit fault of digital circuit - Google Patents
Method and system for diagnosing open-circuit fault of digital circuit Download PDFInfo
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- CN103399250A CN103399250A CN201310326003XA CN201310326003A CN103399250A CN 103399250 A CN103399250 A CN 103399250A CN 201310326003X A CN201310326003X A CN 201310326003XA CN 201310326003 A CN201310326003 A CN 201310326003A CN 103399250 A CN103399250 A CN 103399250A
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Abstract
The invention provides a method and a system for diagnosing an open-circuit fault of a digital circuit. According to the method and the system, a digital signal output module is connected with a digital signal acquisition module, so as to selectively output a high level or a low level according to the actual state of the current circuit; the digital signal acquisition module is connected with a digital signal fault diagnosis module, so as to acquire a digital signal voltage value; when the digital circuit is short-circuited to a power supply, the acquired voltage value is equal to the voltage of the power supply; when the digital circuit is short-circuited to the ground, the acquired voltage value is equal to 0 V; when the digital circuit is in open circuit, the acquired voltage value is equal to one second of the voltage of the power supply; the digital signal fault diagnosis module performs comparative diagnosis on the output voltage value and standard voltage values under five conditions of high level, low level, short circuit to the power supply, short circuit to the ground and open circuit and judges whether the current digital input circuit has an open-circuit fault or not. After the digital circuit is diagnosed by utilizing the method and the system, various fault modes of the digital circuit can be recognized, the open-circuit fault of the digital circuit can be clearly and accurately reported, and the defect that open-circuit diagnosis cannot be performed on a traditional digital circuit is effectively overcome.
Description
Technical field
The present invention relates to hybrid vehicle digital circuit failure condition diagnosing technology, particularly relate to the method and system of a kind of digital circuit open circuit diagnosis.
Background technology
Hybrid vehicle comprises the idling start and stop, energy reclaims, accelerates a plurality of functions such as power-assisted, entire car controller is in order to realize these functions, usually need to use digital circuit and close obtaining of heavy signal, collection as the brake pedal signal, so the condition diagnosing for digital circuit in hybrid power system is absolutely necessary, and draw traditionally/digital circuit of pull-down can't diagnose open circuit.
Summary of the invention
In order to address the above problem, the present invention proposes a kind of diagnostic method and system for hybrid vehicle digital circuit open fault, by comparing the magnitude of voltage of Contemporary Digital input, the residing malfunction of judgement digital circuit, to improve the diagnosis coverage of digital circuit.
The technical solution used in the present invention is specific as follows:
The invention provides a kind of accurate, reliable hybrid vehicle digital circuit open fault diagnostic system, it is comprised of three modules, is respectively: digital signal acquiring module, digital signal acquiring module and digital signal fault diagnosis module.
Digital signal output modules, can be that current working control demand is selected output high level or low level according to current circuit virtual condition, and high level voltage value and the supply voltage value of its normal output are unequal; The low level voltage value of its normal output is not equal to 0V.
The digital signal acquiring module, can gather the digital signal voltage value of current input, and high level voltage value and the supply voltage value of its collection are unequal; The low level voltage value of its collection is not equal to 0V; During to power supply short circuit, the magnitude of voltage of its collection equals supply voltage when digital circuit; When the digital circuit shorted to earth, the magnitude of voltage of its collection equals 0V; When digital circuit was opened a way, the magnitude of voltage of its collection equaled 1/2nd supply voltages.
The digital signal fault diagnosis module, compare diagnosis according to the magnitude of voltage of digital signal acquiring module output, judges whether the Contemporary Digital input circuit open fault occurs.
By the digital circuit failure state is analyzed, the standard voltage value of the numeral input under each state (comprise high level, low level, to power supply short circuit, shorted to earth, five kinds of states of open circuit) reasonably is set in circuit, compare with the real figure input voltage value, can identify this failure condition of digital circuit open circuit.
Adopt described system to carry out the concrete steps of method of open fault diagnosis as follows:
Input end and the receiving end of coupling digital circuit, arrange the Contemporary Digital circuit be in respectively high level, low level, to the normal voltage of collection point in power supply short circuit, shorted to earth, five kinds of situations of open circuit.
, by the controller digital signal acquiring circuit, obtain the magnitude of voltage of Contemporary Digital input signal.
, if the magnitude of voltage of Contemporary Digital circuit input signal equates with standard high level voltage value, judge that current circuit input is in high level state;
, if the magnitude of voltage of Contemporary Digital circuit input signal equates with standard low level voltage value, judge that current circuit input is in low level state;
If the magnitude of voltage of Contemporary Digital circuit input signal equates the power supply short circuit magnitude of voltage with standard, judge that current circuit occurs the power supply short circuit fault,, if the magnitude of voltage of Contemporary Digital circuit input signal and standard are unequal to the power supply short circuit magnitude of voltage, judge that current circuit does not occur the power supply short circuit fault;
If the magnitude of voltage of Contemporary Digital circuit input signal equates with standard shorted to earth magnitude of voltage, judge current circuit generation shorted to earth fault,, if the magnitude of voltage of Contemporary Digital circuit input signal and standard shorted to earth magnitude of voltage are unequal, judge that the shorted to earth fault does not occur current circuit;
If the magnitude of voltage of Contemporary Digital circuit input signal equates with the standard open-circuit voltage values, judge current circuit generation open fault,, if the magnitude of voltage of Contemporary Digital circuit input signal and standard open-circuit voltage values are unequal, judge that open fault does not occur current circuit.
If the magnitude of voltage of Contemporary Digital circuit input signal and standard voltage value are all unequal, current circuit state is unknown.
, according to the hybrid vehicle digital circuit diagnostic system of the method design, can diagnose out the open-circuit condition of Contemporary Digital circuit fast and accurately, and can effectively solve the drawback that conventional digital circuits can't be opened a way and be diagnosed.
Description of drawings
The schematic flow sheet of a kind of digital circuit open fault diagnostic method that Fig. 1 provides for the embodiment of the present application;
The structural representation of a kind of digital circuit open fault diagnostic method that Fig. 2 provides for the embodiment of the present application;
Description of reference numerals: 1-digital signal output modules; 2-digital signal acquiring module; 3-digital signal fault diagnosis module.
Embodiment
Below be described with reference to the accompanying drawings again content of the present invention:
Embodiment one:
The schematic flow sheet of a kind of digital circuit open fault diagnostic method that Fig. 1 provides for the embodiment of the present application.
As shown in Figure 1, the diagnostic method of a kind of digital circuit open fault that the embodiment of the present application provides comprises:
Input end and the receiving end of coupling digital circuit, arrange the Contemporary Digital circuit be in respectively high level, low level, to the normal voltage of collection point in power supply short circuit, shorted to earth, five kinds of situations of open circuit, respectively these five kinds of normal voltages are labeled as U1, U2, U3, U4, U5, and these five standard voltage value are stored.
Obtain the magnitude of voltage U6 of Contemporary Digital input signal by digital signal acquiring module 2.
, if the magnitude of voltage U6 of Contemporary Digital circuit input signal equates with standard high level voltage value U1, judge that current circuit input is in high level state.
, if the magnitude of voltage U6 of Contemporary Digital circuit input signal equates with standard low level voltage value U2, judge that current circuit input is in low level state.
If the magnitude of voltage U6 of Contemporary Digital circuit input signal equates power supply short circuit magnitude of voltage U3 with standard, judge that current circuit occurs the power supply short circuit fault,, if the magnitude of voltage U6 of Contemporary Digital circuit input signal and standard are unequal to power supply short circuit magnitude of voltage U3, judge that current circuit does not occur the power supply short circuit fault.
If the magnitude of voltage U6 of Contemporary Digital circuit input signal equates with standard shorted to earth magnitude of voltage U4, judge current circuit generation shorted to earth fault,, if the magnitude of voltage U6 of Contemporary Digital circuit input signal and standard shorted to earth magnitude of voltage U4 are unequal, judge that the shorted to earth fault does not occur current circuit.
If the magnitude of voltage U6 of Contemporary Digital circuit input signal equates with standard open-circuit voltage values U5, judge current circuit generation open fault,, if the magnitude of voltage U6 of Contemporary Digital circuit input signal and standard open-circuit voltage values U5 are unequal, judge that open fault does not occur current circuit.
If the magnitude of voltage U6 of Contemporary Digital circuit input signal and standard voltage value U1, U2, U3, U4, U5 are all unequal, current circuit state is unknown.
Embodiment two:
The schematic diagram of a kind of digital circuit open fault diagnostic system that Fig. 2 provides for the embodiment of the present application.
As shown in Figure 2, a kind of digital circuit open fault diagnostic system comprises digital signal output modules 1; Digital signal acquiring module 2; Digital signal fault diagnosis module 3.
Digital signal output modules 1 is connected with digital signal acquiring module 2, and the transmission that is used for digital signal level is mutual; Digital signal acquiring module 2 is connected with digital signal fault diagnosis module 3, is used for providing Contemporary Digital applied signal voltage value.
Described digital signal output modules 1, can select output high level or low level according to current working control demand, and high level voltage value and the supply voltage value of its normal output are unequal; The low level voltage value of its normal output is not equal to 0V.
Digital signal acquiring module 2, can gather the digital signal voltage value of current input, and high level voltage value and the supply voltage value of its collection are unequal; The low level voltage value of its collection is not equal to 0V; During to power supply short circuit, the magnitude of voltage of its collection equals supply voltage when digital circuit; When the digital circuit shorted to earth, the magnitude of voltage of its collection equals 0V; When digital circuit was opened a way, the magnitude of voltage of its collection equaled 1/2nd supply voltages.
Digital signal fault diagnosis module 3, compare diagnosis according to the magnitude of voltage of digital signal acquiring module 2 outputs, judges whether the Contemporary Digital input circuit open fault occurs.
After adopting above method and system to diagnose digital circuit, can identify the various fault modes in digital circuit, and can be clear, count off open circuit fault accurately, effectively solved can't the open a way drawback of diagnosis of conventional digital circuits.
Claims (2)
1. hybrid vehicle digital circuit open fault diagnostic system, it is comprised of digital signal output modules (1), digital signal acquiring module (2) and digital signal fault diagnosis module (3), it is characterized in that:
Described digital signal output modules (1) connects digital signal acquisition module (2), select output high level or low level according to current circuit virtual condition, high level voltage value and the supply voltage value of its normal output are unequal, and the low level voltage value of its normal output is not equal to 0V;
Described digital signal acquiring module (2) connects digital signal fault diagnosis module (3), its digital signal voltage value to digital signal output modules (1) output gathers, during to power supply short circuit, the magnitude of voltage of its collection equals supply voltage when digital circuit; When the digital circuit shorted to earth, the magnitude of voltage of its collection equals 0V; When digital circuit was opened a way, the magnitude of voltage of its collection equaled 1/2nd supply voltages;
Described digital signal fault diagnosis module (3), magnitude of voltage according to digital signal acquiring module (2) output, with be in high level, low level in controller, the standard voltage value in power supply short circuit, shorted to earth, five kinds of situations of open circuit compared diagnosis, judge whether the Contemporary Digital input circuit open fault occurs.
2. utilize system claimed in claim 1 to carry out the method for hybrid vehicle digital circuit open fault diagnosis, concrete steps are as follows:
(1) input end and the receiving end of coupling digital circuit, arrange in controller the Contemporary Digital circuit be in respectively high level, low level, to the standard voltage value of collection point in power supply short circuit, shorted to earth, five kinds of situations of open circuit;
(2) obtain the magnitude of voltage of Contemporary Digital input signal by the digital signal acquiring module;
(3) carry out fault diagnosis by the digital signal fault diagnosis module:
, if the magnitude of voltage of Contemporary Digital circuit input signal equates with standard high level voltage value, judge that current circuit input is in high level state;
, if the magnitude of voltage of Contemporary Digital circuit input signal equates with standard low level voltage value, judge that current circuit input is in low level state;
If the magnitude of voltage of Contemporary Digital circuit input signal equates the power supply short circuit magnitude of voltage with standard, judge that current circuit occurs the power supply short circuit fault,, if the magnitude of voltage of Contemporary Digital circuit input signal and standard are unequal to the power supply short circuit magnitude of voltage, judge that current circuit does not occur the power supply short circuit fault;
If the magnitude of voltage of Contemporary Digital circuit input signal equates with standard shorted to earth magnitude of voltage, judge current circuit generation shorted to earth fault,, if the magnitude of voltage of Contemporary Digital circuit input signal and standard shorted to earth magnitude of voltage are unequal, judge that the shorted to earth fault does not occur current circuit;
If the magnitude of voltage of Contemporary Digital circuit input signal equates with the standard open-circuit voltage values, judge current circuit generation open fault,, if the magnitude of voltage of Contemporary Digital circuit input signal and standard open-circuit voltage values are unequal, judge that open fault does not occur current circuit;
If the magnitude of voltage of Contemporary Digital circuit input signal and standard voltage value are all unequal, current circuit state is unknown.
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| CN201310326003XA CN103399250A (en) | 2013-07-30 | 2013-07-30 | Method and system for diagnosing open-circuit fault of digital circuit |
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| CN107607827A (en) * | 2017-10-23 | 2018-01-19 | 深圳市捷代电子科技有限公司 | Vehicle diagnosis seat safety detection circuit |
| CN109387778A (en) * | 2017-08-10 | 2019-02-26 | 联合汽车电子有限公司 | Digital switch detection circuit and method |
| CN111060845A (en) * | 2019-12-13 | 2020-04-24 | 潍柴动力股份有限公司 | Fault processing method, device, equipment and storage medium |
| CN111098723A (en) * | 2018-10-26 | 2020-05-05 | 上海汽车集团股份有限公司 | Charging port electronic lock control method and system |
| CN111398699A (en) * | 2018-12-29 | 2020-07-10 | 长城汽车股份有限公司 | Method, device and medium for diagnosing state of high-voltage system |
| CN112800716A (en) * | 2021-02-04 | 2021-05-14 | 北京华大九天科技股份有限公司 | Method for detecting open circuit of wire net in wiring of integrated circuit layout |
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| CN112800716A (en) * | 2021-02-04 | 2021-05-14 | 北京华大九天科技股份有限公司 | Method for detecting open circuit of wire net in wiring of integrated circuit layout |
| CN112800716B (en) * | 2021-02-04 | 2022-03-01 | 北京华大九天科技股份有限公司 | Method for detecting open circuit of wire net in wiring of integrated circuit layout |
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Application publication date: 20131120 |