• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The operation of an electromagnetic valve is monitored by connecting the coil of the valve to a d.c. source for a period of time sufficient to permit the current in the coil to reach its maximum steady state value then disconnecting the coil to permit the current to fall and re-connecting the coil to the source again and measuring the current which is established in the coil.
    公开号:SU1658832A3
    申请号:SU884355931
    申请日:1988-05-07
    公开日:1991-06-23
    发明作者:Трокс Уве；КУССЕЛЬ Вилли；Ройтер Мартин；Кениг Йоханнес
    申请人:Геверкшафт Эйзенхютте Вестфалия, Гмбх (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a method of switching control of electromagnetic valves, in particular, in the case of electro-hydraulic control of a support, etc. objects by determining the inductance of an electromagnet coil by measuring the current and processing the data of measured values using an electronic computing device.
    The purpose of the invention is to provide the ability to control the switching position of the valve core at any time.
    FIG. 1 shows a diagram of the dependence of the inductance of an electromagnet coil on the switching position of its core; on
    figure 2 - diagram of the switching control of the electromagnetic valve (current-time diagram).
    FIG. 1 and 2, respectively, the time in milliseconds is indicated on the abscissa, and the current in milliamperes is shown on the ordinate axis. The diagram in FIG. Figure 1 shows the current response when the DC coil circuit of the solenoid valve is turned on, the current rise curve I reflects the current characteristic, for example, when the core is released, and the current rise curve II shows the current characteristic, for example, when the current core is retracted. Both curves I and II show that the inductance of the coil of the electromagnetic valve is strongly dependent
    ON SL 00 00
    WITH
    N3

    WITH
    from the position of cor. The maximum current in the coil, i.e. The starting current I is the same in both cases.
    When the DC coil of the solenoid valve coil is opened, the current I decreases, and the release current curve when the core is released lowers more steeply than when the core is retracted.
    Depending on the valve design, the ratios may be reversed. This suggests that with certain designs of a solenoid valve, the rise current curve with the bark retracted may also be steeper than when the bark is released. Essential for switching control is the difference in the course of the current rise and / or release curve when the core is released and the core is retracted.
    The diagram of FIG. 2 shows a typical course of the current curve when the solenoid valve is turned on at time point to. The curve, which reflects the current characteristic and thus also the inductance, shows at the moment of exchanging the core of the solenoid valve, a pronounced dip A, which can be attributed to an abrupt change in inductance when the core is rearranged. Then, the current rises according to the exponential function to the maximum value h of the starting current. At time ti, the current in the coil of the electromagnet for the purpose of measurement is repeatedly short-circuited, and at time t2 it is turned on again. When disconnected at time t2 in the selected execution example, the release current curve B is obtained if, before switching on, the measles was retracted. If this is not the case, then the steepness curve B of the release current, shown in Fig. 2 by the dashed line, is steeper.
    If the current measurement in the external circuit of the solenoid valve is thus carried out in front of the diode bridge (rectifier bridge) provided for the system self-protection circuit on the control unit, then the current I, when disconnected at time ti, decreases almost instantaneously to lo, and in the coil circuit the current decreases along curve B, according to curve B of the release current. If the current is switched on again at time t.2, then the current instantly increases to 1m2 or Gm2, depending on whether the electromagnet coil was retracted before or was not drawn. Thus, the release current curve has stroke A or B. By measuring the current at a particular time t2. located on the release current curve,
    The switching position of the solenoid valve, depending on its parameters, can thus be determined by the computing device.
    (electronic control unit).
    It is also possible at a certain point in time t} after the current is switched on again at time t2, the current is measured so that on curve C,
    0, respectively, by the curve C of the current of growth, determine the value of 1 m2, respectively, 1 M2 of current. Curve C of the build-up current represents the current characteristic when the core is retracted, and Curve C of the build-up current represents
    5 released bark. Depending on whether the measles are drawn in or released, a different measured value is thus obtained for the current, so that, based on the current measurement at a certain moment
    0 time 1h can also judge the position of the switching elements of the solenoid valve.
    There is also the option after turning off the coil at time ti
    5 to carry out several current measurements on the current release and / or rise curve, and based on the measured values obtained using a computing device, determine the position
    0 switching elements of the solenoid valve.
    In the diagram in FIG. 2, which forms the zero point, the magnitude of 1 o of the current does not necessarily have to have a value of zero. With
    5 several solenoid valves fed by a common DC source, which are also switched on, the current magnitude 1 o can form a non-zero relative current magnitude, which at
    0 represents the relative zero point relative to the current measurement of this solenoid valve. Using the indicated measurements on curves B, B, respectively, C, C can also be measured.
    5 values of 1o and I current, on the basis of the current values thus obtained to determine the position of the switching elements of the solenoid valve in the presence of a group of solenoid valves.
    As shown, current measurements can be made on control units that can be connected with solenoid valves with an electrical cable. On
    The 5 solenoid valves themselves may not include measuring bodies, which are considered to be the position of the core. The time interval from tripping at time ti to re-activating at time t2 can be selected when
    权利要求:
    Claims (2)
    [1]
    non-blocking solenoid valves are so short that their measles, due to their inertia, remain at rest after a measurement time interval. Claim 1. Method of switching control of electromagnetically controlled valves, for example, with electro-hydraulic control of a support, according to which an electromagnet coil is connected to a current source, the inductance of an electromagnet coil is determined by measuring the current value in the coil and processing the measurement results using an electronic computing device, characterized in that, in order to enable the monitoring of the switching position of the core
    0
    five
    valves at any time, when the current reaches its maximum inrush current, it is briefly disconnected and after a certain time interval is turned on again, and after switching off and (or) re-activating, the current of the release section and / or the current curve of the actuation section determine the value current at a given time.
    [2]
    2. The method according to claim 1, wherein that the time interval from the moment of shutdown to the moment of reclosing is chosen so short that, when controlling electromagnetic valves without self-blocking, measles under the influence of its inertia remains at rest during the specified interval.
    Jo
    about
    U
    类似技术:
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    同族专利:
    公开号 | 公开日
    GB2205198B|1990-10-17|
    DE3715591A1|1988-11-17|
    US4870364A|1989-09-26|
    PL159207B1|1992-11-30|
    GB8810917D0|1988-06-15|
    DE3715591C2|1989-02-16|
    PL272353A1|1989-02-20|
    GB2205198A|1988-11-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3988664A|1975-02-18|1976-10-26|Burroughs Corporation|System for predicting or detecting a fault in a solenoid utilization system|
    US4712071A|1983-07-19|1987-12-08|Charbonneau & Godfrey Associates|Motor operated valve analysis and testing system|
    JPH0774673B2|1986-02-14|1995-08-09|本田技研工業株式会社|Abnormal processing method of solenoid valve current control device|
    US4692939A|1986-03-19|1987-09-08|Communications Test Design, Inc.|Switch testing|
    US4746869A|1987-06-10|1988-05-24|Hesston Corporation|Circuit for testing inductive coils|DE3922900A1|1989-07-12|1991-01-17|Wabco Westinghouse Fahrzeug|Monitoring of electromagnetic actuator - using circuit coupled to microprocessor to provide input that can be compared with reference to identify fault|
    DE4010198A1|1990-03-30|1991-10-02|Bosch Gmbh Robert|METHOD FOR MONITORING INDUCTIVE LOADS FOR ERRORS|
    JP3105007B2|1990-07-06|2000-10-30|ジヤトコ・トランステクノロジー株式会社|Failure detection device for solenoid valve|
    DE4029735C1|1990-09-20|1992-02-27|Bochumer Eisenhuette Heintzmann Gmbh & Co Kg, 4630 Bochum, De|Monitoring electrohydraulic mining machine operation - measuring time-related voltage drop across resistor in magnetic coil circuit of solenoid valve|
    US5243296A|1990-11-06|1993-09-07|Tokimec Inc.|Method and apparatus for checking operation of solenoid|
    US5492009A|1991-03-11|1996-02-20|Siemens Aktiengesellschaft|Method and apparatus for testing a valve actuated by an electromagnet having an armature|
    GB2260030A|1991-09-14|1993-03-31|Kloeckner Humboldt Deutz Ag|Control systems for electromagnetic valves|
    US5539608A|1993-02-25|1996-07-23|Eaton Corporation|Electronic interlock for electromagnetic contactor|
    DE4433209C2|1994-09-17|2000-02-03|Mtu Friedrichshafen Gmbh|Device for the detection of the armature impact time when a solenoid valve is de-energized|
    JPH09317419A|1996-05-28|1997-12-09|Toyota Motor Corp|Malfunction detection method for electromagnetically driven intake and exhaust valve|
    US5748427A|1996-12-19|1998-05-05|Physio-Control Corporation|Method and system for detecting relay failure|
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    US6476599B1|1999-03-25|2002-11-05|Siemens Automotive Corporation|Sensorless method to determine the static armature position in an electronically controlled solenoid device|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE3715591A|DE3715591C2|1987-05-09|1987-05-09|
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