EP3384300A1 - Procede de detection de charge ouverte - Google Patents
Procede de detection de charge ouverteInfo
- Publication number
- EP3384300A1 EP3384300A1 EP16798629.8A EP16798629A EP3384300A1 EP 3384300 A1 EP3384300 A1 EP 3384300A1 EP 16798629 A EP16798629 A EP 16798629A EP 3384300 A1 EP3384300 A1 EP 3384300A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- load
- open
- intensity
- current
- diagnosis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
-
- 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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
- G01R31/007—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks using microprocessors or computers
-
- 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
- G01R31/40—Testing power supplies
-
- 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
- G01R31/52—Testing for short-circuits, leakage current or ground 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
- G01R31/54—Testing for continuity
-
- 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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2812—Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance
-
- 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
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
Definitions
- the invention relates to a method for detecting the occurrence of an "open load" situation, corresponding to a situation in which a resistive or inductive load, powered by an electronic power circuit, is disconnected or, more broadly, to a situation in which there is an open circuit between the output of the transistor transmitting the signal controlling the load concerned and said load.
- the present invention relates, in this context, to a method for improving the control of the establishment of diagnostics for determining the presence or absence of an open load situation, in the case where the control transistor is closed. then speaks, in the state of the art, of "load ON", while one speaks of "load OFF” when the control transistor is open, preventing any transmission of a control signal to said load.
- OpenLoad in order to detect failures in a circuit, such as the breaking of a cable or the disconnection of the load, open load detection functions, "OpenLoad” according to the English term often used by those skilled in the art, have been developed.
- the search for an open load is "load ON".
- the load being controlled, and it is sought to start the load, that is to say to pass a current in the branch formed by the control transistor and the load;
- the control transistor In the case of a resistive load, the control transistor being closed, it is sought to pass a current in the load. If a current is measured between the output of the control transistor and the load, and if the intensity of this current is greater than a predetermined positive threshold, then a diagnosis that there is no open load can be established. If no current of intensity greater than the predetermined positive threshold is detected, then a diagnosis according to which there is an open load situation may possibly be established.
- the first method of seeking to measure a current of intensity higher than a predetermined positive threshold is quite effective in the case of a resistive load.
- the time required to establish a safe diagnosis is prejudicial, because it is generally necessary to know immediately, or as soon as possible, the open state or no load when implementing a load control.
- This paradox induces, in the state of the art, many bad detections: an open charge can thus be diagnosed while the charge is present, the time required for the establishment of a current of intensity higher than the positive threshold. predetermined that has proved to be too long for load control.
- the time that the current in the branch formed by the control transistor and an inductive load is established it is possible that the load control has reversed the direction of the control current, so that the time required before detecting a current of intensity greater than the predetermined positive threshold may be even more important.
- the second family of known techniques consisting, in the case of an inductive load, of detecting an inversion of the current on the branch formed by the control transistor and the load, during a closing / opening of said control transistor, is more complex to implement and always involves, moreover, a potentially long time before being able to establish a reliable diagnosis. Indeed, it is necessary that the load is well charged in order to be able to detect its discharge, and therefore the inversion of the current, when closing the control transistor after opening it.
- the known solutions would consist of waiting for the necessary time or to influence the charge control.
- the method according to the invention aims to allow the establishment of a reliable diagnosis relating to the presence or not of an open load situation, quickly and without influence on the load control.
- the present invention relates to an open charge detection method for providing a diagnosis according to which there is or not, at a given instant, an open load situation in a system comprising an electronic power circuit.
- a control transistor for transmitting a control current to a load, said transistor, in the closed position, forming, with said load, a branch, said method for detecting, in order to establish the diagnosis, the possible presence of an open circuit between the transistor and the load, on said branch, or the disconnection of the load, said method comprising the following steps, the control transistor being closed:
- step iii comparing the intensity of the measured current with a predetermined first positive threshold and, if the intensity of the measured current is greater than the first positive threshold, providing a diagnosis according to which there is no charge situation open to the moment T; otherwise, the continuation of the process by step iii.
- step iii comparing the intensity of the measured current with a second predetermined negative threshold and, if the intensity of the measured current is lower than the second negative threshold, providing a diagnosis according to which there is no charge situation open to the moment T; otherwise, the continuation of the process by step iv.
- the intensity of the measured current being, at time T, between the second negative threshold and the first positive threshold, the measurement of the intensity of the current on the branch formed by the control transistor and the load, at a given instant posterior T + ⁇ ,
- the method according to the invention allows the establishment of a diagnosis relating to the existence or not of an open load situation, quickly and reliably, and without having to influence the control of the charge.
- step iv. comprises an initial substep consisting of comparing the time elapsed since a last closing command of the control transistor and the time necessary for the closing of said control transistor and, if the elapsed time is less than the time required for the closing of the transistor of order, the provision of information that no diagnosis could be made and, if not, the continuation of step iv.
- step i. If the intensity of the measured current is greater than a limiting current of the electronic power circuit, the provision of a diagnosis according to which there is no situation charge open at time T.
- step i. If the intensity of the measured current is greater than a maximum current intensity supported by the load or by the electronic power circuit, so that said measured current corresponds to overcurrent, providing a diagnosis that there is no open load situation at time T.
- the method according to the invention comprises a step viii. providing information that no diagnosis could be made if no diagnosis was provided at one of the preceding steps.
- the load is a resistive load.
- the load is an inductive load.
- the invention also relates to a control system of a DC motor, comprising an electronic power circuit comprising a control transistor able to transmit a control signal to said DC motor, said system further comprising measurement means the intensity of the current on the branch formed by the control transistor and the motor, and comparison means, adapted to implement the method as briefly described above.
- the invention also relates to a motor vehicle comprising at least one DC motor, comprising a control system of the DC motor as briefly described above.
- the DC motor is an injector, consisting of an inductive load consisting of a solenoid.
- FIG. 1 represents a diagram showing the steps of the open charge detection method, according to the invention
- FIG. 2 represents a block diagram of an exemplary electronic circuit for implementing the open load detection method according to the invention.
- the invention is presented primarily for an application for open load detection in a system integrated in a motor vehicle. However, other applications are also covered by the present invention, in particular with a view to the detection of open load in any type of application, to enable the establishment of an open load or charge diagnosis present in a system comprising an electronic circuit controlling a resistive or inductive load, including small DC motors.
- the present invention aims at improving the control of the establishment of a diagnosis relating to the existence or not of an open load situation in a system in which an electronic power circuit generates control signals transmitted to a load, resistive or inductive, ultimately through a control transistor connected to said load by a cable.
- control transistor may be unique, in the circuit in question, or be a control transistor among others, able to transmit control signals to said load, for example within an H-bridge.
- the control transistor for transmitting a current corresponding to a control signal to the load, forms with said load a branch.
- a plurality of tests are successively carried out, on the basis of one or more measurements of the intensity of the current flowing in the branch formed by the control transistor and the load.
- the intensity of the current in the branch formed by the control transistor and the load is measured MES1.
- This current is compared CP1 to a predetermined first positive threshold.
- a first test TEST1 is then implemented: if the intensity of the current measured at time t is greater than the predetermined positive threshold, DIAG1 diagnosis according to which the load is present is established.
- a new comparison CP2 is provided at a second negative predetermined threshold. This time, to account for the possibility that the load is working, for example, for a motor, to turn in a negative direction.
- a second test TEST2 is then implemented: if the intensity of the current measured at time t is below the predetermined negative threshold, that is to say also negative and higher than the predetermined negative threshold in absolute value, a diagnosis DIAG1 according to which the load is present is established.
- the present invention provides the embodiment a second measurement MES2 of the intensity of the current in the same branch, at a time t + At slightly later than the instant t, in order to measure the variation of the intensity of the current in the branch as a function of time.
- a calculation CAL of the ratio between the variation Ai of the measured intensity, between the instant t and the instant t + ⁇ , is then carried out, then a comparison CP3 between this ratio and a reference slope is carried out.
- the slope reflecting the evolution of the intensity of the current measured in the branch as a function of time, whether said evolution is positive or negative, through the ratio is compared with a predetermined reference slope.
- the method according to the invention can provide that if the intensity of the measured current is greater than a limitation current of the electronic circuit or the load or if the intensity the measured current is assimilated to an overcurrent in the context of the considered system, then DIAG1 diagnosis according to which the load is present is established directly.
- the method provides the provision of information that no diagnosis could be established.
- FIG. 2 shows an exemplary implementation of an electronic circuit for implementing the method according to the invention.
- a CTRL component is responsible for establishing and providing the open load or load diagnostics that are present in the system, or for providing information that no diagnosis has been established.
- the comparator COMP4 is primarily responsible for verifying that the time elapsed since the last closing command of the control transistor is much longer than the time required for said transistor to complete its closing.
- the comparators COMP1 and COMP2 successively make the comparisons at the first positive threshold and the second negative threshold, as described above. If the intensity of the measured current is between the second negative threshold and the first positive threshold, the intensity of the current in the branch formed by the control transistor and the load is measured again at a slightly later time t + A ⁇ at time t, and this information is "stored” via the capacity C2. After calculating the variation of the current ⁇ during the period of time At, with the aid of the adapted component DELTAJ, this variation Ai is compared, via the comparator CO P3, to a reference slope. If the ratio est is greater than the predetermined reference slope, then the variation of the current in the branch is considered as making it possible to establish the diagnosis DIAG1 according to which the load is indeed present.
- the switches SW1 and SW2 controlled by means of a suitable component, symbolized in the figure by the arrow SW_CT, allow, at the opportune moments, the loading the capacitor C1 with the voltage proportional to the intensity of the current measured at the instant t, then the loading of the capacitor C2 with the voltage proportional to the intensity of the current measured at the instant t + At, and finally , if necessary, the calculation of the variation of the current Ai and its comparison with the reference slope.
- circuit shown in Figure 2 allows, as such, the measurement of a positive variation of the intensity of the current in the branch.
- an additional comparator such an addition being within the reach of those skilled in the art, allows the measurement of a negative variation of the intensity of the current, to implement the method according to the invention optimally.
- the present invention therefore aims, moreover, a control system of a DC motor, incorporating this type of electronic circuit, capable of implementing the previously described method.
- the present invention relates to a method for establishing an open charge or charge diagnosis well present in a system comprising a resistive or inductive load controlled by a control transistor.
- the method according to the invention provides for measuring the intensity of the current in the branch formed by the closed control transistor and the load, then, successively, its comparison with a positive threshold, its comparison with a negative threshold and finally the comparison of its variation, positive or negative, over a time interval ⁇ t, with respect to a reference slope to determine whether a load is present or whether, on the contrary, there is an open load situation.
- the present invention is in particular intended for implementation in the automotive field, to enable the establishment of reliable diagnostics on the existence or not of an open load situation, typically in the context of the control of inductive loads , such as the injectors of a vehicle engine automotive (typically consist of solenoids), or the control of DC motors controlling for example air intake flaps.
- inductive loads such as the injectors of a vehicle engine automotive (typically consist of solenoids), or the control of DC motors controlling for example air intake flaps.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Electric Motors In General (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Electronic Switches (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1561810A FR3044771B1 (fr) | 2015-12-03 | 2015-12-03 | Procede de detection de charge ouverte |
PCT/EP2016/001929 WO2017092846A1 (fr) | 2015-12-03 | 2016-11-18 | Procede de detection de charge ouverte |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3384300A1 true EP3384300A1 (fr) | 2018-10-10 |
Family
ID=55361709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16798629.8A Withdrawn EP3384300A1 (fr) | 2015-12-03 | 2016-11-18 | Procede de detection de charge ouverte |
Country Status (5)
Country | Link |
---|---|
US (1) | US10775445B2 (fr) |
EP (1) | EP3384300A1 (fr) |
CN (1) | CN108603917B (fr) |
FR (1) | FR3044771B1 (fr) |
WO (1) | WO2017092846A1 (fr) |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3704400B2 (ja) * | 1996-07-03 | 2005-10-12 | ファナック株式会社 | モータのインバータ駆動制御装置における異常診断方法 |
TW200605483A (en) * | 2004-03-31 | 2006-02-01 | Matsushita Electric Ind Co Ltd | Inductive load current control circuit and power supply apparatus |
US7908101B2 (en) * | 2007-02-28 | 2011-03-15 | Stmicroelectronics, Inc. | Integrated circuit and method for monitoring and controlling power and for detecting open load state |
JP4696146B2 (ja) * | 2008-06-27 | 2011-06-08 | 株式会社日立製作所 | 断線検出方法および電力変換装置 |
DE102010030826A1 (de) * | 2010-07-01 | 2012-01-05 | Robert Bosch Gmbh | Verfahren und Schaltungsanordnung zur Diagnose eines Lastpfades in einem Fahrzeug |
CN102570377B (zh) * | 2010-12-07 | 2016-06-08 | 中国第一汽车集团公司无锡油泵油嘴研究所 | 负载故障诊断检测方法与装置 |
JP6340373B2 (ja) * | 2012-11-06 | 2018-06-06 | ニューポート・コーポレイションNewport Corporation | 容量性負荷の存在およびタイプ検出システム |
CN103063979B (zh) * | 2013-01-04 | 2014-12-31 | 合肥市英唐科技有限公司 | 一种负载开路检测电路 |
JP6201366B2 (ja) * | 2013-03-27 | 2017-09-27 | 株式会社ジェイテクト | 電気負荷制御装置の過電流異常判定装置、駆動力配分制御装置、および過電流異常判定方法ならびに過電流異常判定プログラム |
JP5619253B1 (ja) * | 2013-10-15 | 2014-11-05 | 三菱電機株式会社 | 誘導性負荷の給電制御装置 |
CN203838276U (zh) * | 2014-04-01 | 2014-09-17 | 杭州电子科技大学 | 一种低压直流负载断路监测电路 |
CN204241613U (zh) * | 2014-12-19 | 2015-04-01 | 惠州市德赛西威汽车电子有限公司 | 一种负载开路检测电路 |
-
2015
- 2015-12-03 FR FR1561810A patent/FR3044771B1/fr active Active
-
2016
- 2016-11-18 US US15/780,486 patent/US10775445B2/en active Active
- 2016-11-18 EP EP16798629.8A patent/EP3384300A1/fr not_active Withdrawn
- 2016-11-18 WO PCT/EP2016/001929 patent/WO2017092846A1/fr active Application Filing
- 2016-11-18 CN CN201680081008.2A patent/CN108603917B/zh active Active
Also Published As
Publication number | Publication date |
---|---|
FR3044771B1 (fr) | 2017-12-01 |
CN108603917B (zh) | 2020-11-10 |
WO2017092846A1 (fr) | 2017-06-08 |
FR3044771A1 (fr) | 2017-06-09 |
CN108603917A (zh) | 2018-09-28 |
US10775445B2 (en) | 2020-09-15 |
US20180372786A1 (en) | 2018-12-27 |
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