GB2260030A - Control systems for electromagnetic valves - Google Patents
Control systems for electromagnetic valves Download PDFInfo
- Publication number
- GB2260030A GB2260030A GB9219440A GB9219440A GB2260030A GB 2260030 A GB2260030 A GB 2260030A GB 9219440 A GB9219440 A GB 9219440A GB 9219440 A GB9219440 A GB 9219440A GB 2260030 A GB2260030 A GB 2260030A
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- GB
- United Kingdom
- Prior art keywords
- electromagnetic valve
- current
- current circuit
- parameter
- control unit
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/0007—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using electrical feedback
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2017—Output circuits, e.g. for controlling currents in command coils using means for creating a boost current or using reference switching
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2086—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures
- F02D2041/2093—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures detecting short circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/063—Lift of the valve needle
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The control system comprises a first control device 3 connected in series with the valve 2, a valve movement sensor 8, and a second control device 4 responsive to a parameter such as the current in the valve actuator coil for controlling the first control device. A further control unit 15 receives input signals from engine sensors and the valve may be part of a fuel injection system. A diagnostic device may also be connected to the control system for disconnecting the supply voltage to a malfunctioning valve. <IMAGE>
Description
Device for the control of electromagnetic valves
Description
The invention relates to a device, in particular an output stage, and a process for the control of at least one electromagnetic valve according to the generic term of the independent Patent claims.
A process is known from EP 0 261 134 for the control of the deexcitation time of an electromagnetic device, in particular the control of electromagnetic valves in internal combustion engines, in which solely the switch-off cycle of an electromagnetic valve is described. No information about the switch-on cycle of an electromagnetic valve can be inferred from this process. The deexcitation time is controlled using an evaluation circuit which records the actual de-excitation time and compares it with a deexcitation time deposited in a characteristics field. The quantity of fuel input is then corrected through set point/ actual-value comparison, which has the disadvantage of being time-consuming.To control the de-excitation time in this process a number of different voltage sources are assigned to each electromagnetic valve for control purposes, so that adjustment of the electromagnetic valve is through a number of preset voltage values. An optimal and therefore current-saving setting of the electromagnetic valve is not possible with the rigid use of preset voltage values. Realisation of a number of voltage values is, moreover, laborious.
The aim of the invention is to make available a device and a process for the control of electromagnetic valves which enables a safe and current-saving setting of at least one electromagnetic valve and avoids the aforementioned disadvantages.
This aim is achieved by virtue of the properties referred to in the characterizing section of the independent Patent claims.
According to the invention, the final controlling element is controlled by a control device, whereby a parameter of the current circuit is relayed to the control device. The control device enables a safe and energy-saving setting of the electromagnetic valve, based on a signal from the electronic control unit, since the control device enables an exact setting of the valve current via the final controlling element. This is dependent on a parameter of the current circuit which is recorded and relayed to the control device. In an advantageous manner, the current flowing in the current circuit is adopted as the parameter. To regulate the current flowing in the current circuit the control device takes the form of a current control device.
As an alternative to the current flowing in the current circuit the voltage of the electromagnetic valve is recorded and regulated.
In a further development of the invention, the output stage has a current measuring device to measure the current flowing in the current circuit. To regulate the current flowing in the current circuit it is necessary to record the value of the current, with the aid of the current measuring device. Recording of the current value may be performed, in particular, by using a resistance of known value lying in the current circuit, so that the current is calculated from the known resistance value and the voltage applied and the value relayed to the control device. To this end, the control device is advantageously connected to the current measuring device. Equally, the control device is connected to the electronic control unit, so that the activation of the control device is dependent on the signal from the electronic control unit.Transfer of data from the electronic control unit to the control device (such as the transfer of extreme values) is also plausible. Further, the control device is connected to a device for recording the movement of the electromagnetic valve (impact recognition), so that the control device is informed at that point in time at which the electromagnetic valve is completely closed (or opened).
In a further development of the invention, the control device is connected to a limiting device. This has the advantage that the limiting device may set extreme values for current regulation.
These extreme values are minimum or maximum switching times, or switch-on times, of the electromagnetic valve. Presetting of a maximum current to the electromagnetic valve by the limiting device is equally possible.
In a further development of the invention, the output stage has a diagnostic device, whereby in a particularly advantageous mode of operation, the diagnostic device controls a switching device.
Through the diagnostic device it is advantageously possible to recognise, in good time, errors or deviations in the output stage which would have a deleterious effect on the fuel injection. By implementation of suitable measures (such as breaking the power supply through the final controlling element) the safe operation of the device according to the invention is ensured, so that damage, for instance to the internal combustion engine, is avoided. The parameter of the current circuit can, in particular, be used for carrying out the diagnosis.
A further solution (on its own or in combination with the described control device) is a device, in particular an output stage of an electronic fuel injection device of an internal combustion engine, for the control of at least one electromagnetic valve, whereby the valve lies in one current circuit with a final controlling element, and the output stage is connected to an electronic control unit, characterised in that a switching device, controlled by the electronic control unit, is arranged in the current circuit, whereby each electromagnetic valve may be switched separately by a switch of the switching device. This has the advantage that with the switching device, just one output stage of an electronic fuel injection device is allocated to a number of valves.In addition, each electromagnetic valve is separately switchable through one switch of the switching device so that it is ensured that one electromagnetic valve is connected to the output stage or final controlling element, with the other electromagnetic valves disconnected. This firstly ensures a secure setting of the electromagnetic valve, since there is only one output stage and the susceptibility to errors is reduced because there are no other output stages. Secondly, a power-saving setting of the electromagnetic valve is made possible since only a single output stage and a single valve are in operation.
In a further development of the invention, the switches of the switching device are alternately switchable. Alternately in this context means that the switching device switches a single electromagnetic valve into the current circuit, whereas the other valves are disconnected. If there are only two valves, then the switch of the switching device is advantageously in the form of a change-over switch, so that only one valve is in the current circuit at any given time. Furthermore, operation of the switches may be devised such that the collective connection or disconnection of the valves is possible.
In a further development of the invention, the switching device is connected to the electronic control unit via a data line.
Through the control of the switching device by the electronic control unit, the electromagnetic valve of that cylinder having the combustion chamber into which fuel is to be injected is selected. To this end, the switching device is in the form of an output multiplexer, controlled via an address decoder.
A device (on its own or in combination with the solutions described above), in particular an output stage of an electronic fuel injection of an internal combustion engine, for the control of at least one electromagnetic valve, whereby the device is connected to an electronic control unit and having one device to record the movement of the electromagnetic valve, whereby said electromagnetic valve lies with a final controlling element in a current circuit, is characterised in that an auxiliary device is assigned to the valve to influence a parameter of the current circuit. The auxiliary device influences the parameter of the current circuit in such a way that the parameter is controlled in pulse fashion during the switch-on time of the electromagnetic valve. The parameter of the circuit is preferentially the current flowing in the current circuit.A plausible alternative is to influence the voltage applied to the valve.
In a further development of the invention, the auxiliary device is assigned to the device which records the movement of the electromagnetic valve. This has the advantage that the movement of the valve is recorded and in particular that the attainment of a final state of the valve is detected. The activation of the auxiliary device is then possible on the basis of the recagnition of the final state of the valve having been reached. An earlier or later activation of the auxiliary device is, moreover, equally plausible.
In a further development of the invention, the auxiliary device is assigned to the device which records parameters of the current circuit. By recording the parameter of the current circuit it is possible to set a desired time course for the parameter using the final controlling element and the auxiliary device. It is thus conceivable for the parameter to be cut off should it exceed a preset maximum value. If the parameter falls below a preset minimum value then the parameter of the current circuit can again be switched in. This may be achieved, for instance, by switching the power supply to the electromagnetic valve on or off. To facilitate this process, the auxiliary device is advantageously provided with a means to compare the parameter measured with at least one preset limiting value.Furthermore, in an equally advantageous manner, the auxiliary device is assigned to a switching device which functions according to the outcome of the comparison. The preset limiting values may, for instance, be two different threshold values for the current flowing in the current circuit, whereby both threshold values must have positive preceding signs with respect to a reference point (reference potential of the current circuit). Equally plausible are threshold values with negative preceding signs or with different preceding signs.
In a further development of the invention, the auxiliary device is connected to the control device influencing the final controlling element. Upon conclusion of the operating period of the final controlling element, preset by the electronic control unit, the auxiliary device is switched off by the device for the recording of the movement of the electromagnetic valve. This also enables the electromagnetic valve to be switched off at short notice.
A process according to the invention for the control of at least one electromagnetic valve, in particular for the control of an output stage of an electronic fuel injection device of an internal combustion engine, whereby the output stage is connected to an electronic control unit and the movement of the electromagnetic valve is recorded, is characterised in that an electrical parameter, characterising the valve, is elevated to a preset limiting value and is constantly maintained at that value in a manner dependent upon a signal emitted by the electronic control unit. This process has the advantage that the point in time of the desired actuation may be exactly set as a function of the signal emitted by the electronic control unit.
The electrical parameter characterising the valve is advantageously the current flowing through the current circuit.
Moreover, the use of a voltage applied to the electromagnetic valve is equally possible. By increasing the current until a preset limiting value is attained, it is ensured that the electromagnetic valve is switched from a first state (open or closed) to a second state (closed or open). Once the preset limiting value has been reached, the current is maintained at a constant level, so that the electromagnetic valve is securely held in the position it has reached.
In a further development of the invention, the limiting value is kept constant for a preset period of time. This has the advantage that the electromagnetic valve is certain to reach its second state and remains in this position once undesirable mechanical and electrical effects (for instance friction or the creation of a magnetic field) have been overcome. Once these effects have been overcome and the final state has been reached, the parameter is reduced after the preset time, according to the invention, to a value below the limiting value and/or is controlled in pulse fashion. The reduction of the parameter (current) to a value below the limiting value has the advantage that the electromagnetic valve maintains the state it has reached and that energy is saved because of the drop in current.As an alternative to the drop in current, or supplementary thereto, the current is controlled in pulse fashion. This may be facilitated, for example, through an auxiliary device which controls the electromagnetic valve, for instance, through a nearly saw-toothed current.
In a further development of the invention, the parameter, in particular the time integral or temporal change in the parameter, is used to carry out a diagnosis. Monitoring of the parameter is possible by feeding the parameter to a diagnostic device according to the invention. Further parameters of importance to the invention which could be used to carry out a diagnosis are fluctuations in rotational speed, in particular cylinder-specific fluctuations in rotational speed, impact recognition signals, supply voltage, as well as the pulse frequency of the pulse mode of control. Where abnormalities exist or the limiting values are exceeded for at least one of these parameters, then the diagnostic device initiates a diagnosis procedure which may, for instance, involve cutting off of the voltage supply to the output stage.Furthermore, a switching off of individual magnetic valves is also plausible. The storage and subsequent display of errors according to their type, location and frequency is equally possible. The error signal from the diagnostic device to an electronic control unit may also be provided for, with suitable software measures then being implemented.
Further embodiments and the set-up, according to the invention, of an output stage of an electronic fuel injection device of an internal combustion engine are shown in Figures 1 - 6 and described in more detail below.
Fig. 1: A device according to the invention, having a control
device
Fig. 2: A device according to the invention, having a limiting
device
Fig. 3: A device according to the invention, having an
auxiliary device
Fig. 4: A device according to the invention, having a
diagnostic device
Fig. 5: Diagram of chart time lines for the description of the
process according to the invention
Fig. 6: A device according to the invention, having an
auxiliary device, a means of comparison and a
switching device.
Fig. 1 shows a device according to the invention having a control device. The device is an output stage of an electronic fuel injection device which controls at least one electromagnetic valve. The output stage designated 1 has at least one electromagnetic valve 2, which adjusts the quantity of fuel which is to be fed to the combustion chamber of the internal combustion engine on the basis of recorded operating parameters. A final controlling element 3 is further contained in the same current circuit as the electromagnetic valve 2, said final controlling element 3 represented by the plus and reference potential signs and supplied by a voltage source. The polarity of the voltage supply may be selected at will and adapted to the particular conditions.The final controlling element 3 is assigned to a control device 4, according to the invention, whereby a parameter of the current circuit is fed to said control device 4. In one embodiment of the invention, the parameter is the current flowing in the current circuit, recorded by a current measuring device 6 located within the current circuit. The control device 4 is controlled by an electronic control unit 15, whereby said electronic control unit 15 is provided with sensor inputs 16.
Operating parameters of the internal combustion engine and further parameters (for instance changes in the power requirement or battery voltage supply) are recorded in an appropriate manner via these sensor inputs 16. Furthermore, a device 6 for the capture of the movement of the electromagnetic valve 2 is assigned to the electromagnetic valve 2 in the output stage 1, said device being connected to the control device 4 and to the electronic control unit 15 on the output side.
Fig. 2 shows a device according to the invention having a limiting device. In addition to the components shown in Fig. 1 and having the same reference numbers, Fig. 2 also shows a limiting device 5 arranged between the control device 4 and the electronic control unit 15, said limiting device 5 limiting the output signals of the electronic control unit 15 or setting limiting values (for instance for the valve current).
Furthermore, further electromagnetic valves 2.1 to 2.n are arranged in.the- current circuit, said electromagnetic valves being separately switched within the current circuit via a switching device 9, controlled by the electronic control unit 15.
This has the advantage that a number of electromagnetic valves can be controlled with a single output stage. The index "n" indicates the number of cylinders in the internal combustion engine to which one electromagnetic valve is assigned. The switching device 9 is in the form of an output multiplexer and is provided with an address decoder which is controlled by the electronic control unit 15 via a data line.
Fig. 3 shows a device according to the invention having an auxiliary device. An auxiliary device, designated 10, is assigned to the electromagnetic valves 2.1 to 2.n, which may be separately switched in to the current circuit individually by means of the switching device 9, and to the current measurement device 6. The assignment of the auxiliary device 10 to other suitable points in the current circuit is equally plausible. The current measurement device 6 has a resistance 7 which lies in the current circuit. The value of the current flowing through the current circuit, which is fed to the control device 4, or which may instead or additionally be fed to other components of output stage 1, can be simply elucidated from the known value of the resistance 7 and the voltage applied to the resistance.
Fig. 4 shows a device according to the invention having a diagnostic device. In a particular embodiment of the invention a diagnostic device 11 is assigned to the control device 4, whereby the diagnostic device 11 is fed an ouLput signal from the current measuring device 6. The diagnostic device 11 is furthermore connected to the input of the electronic control unit 15 and to a further switching device 12 via the connection A-B, whereby said further switching device 12 is arranged within the current circuit. The auxiliary device 10 is connected to the device 8 via the connection C-D.
The components of the output stage 1 shown in Figs. 1 - 4 may, aside from the combinations shown, also be used individually or in other suitable combinations with each other. The mode of operation of the components of output stage 1 shown in Figs. 1 4 will be described below, to which end Fig. 5 contains diagrams of chart time lines for the description of the process according to the invention, through reference to the components shown.
Where the output stage has a switching device 9, then this switching device 9 is controlled by the electronic control unit 15 in such a manner that one of the electromagnetic valves 2.1 to 2.n is switched into the current circuit. Where only a single electromagnetic valve is switched into the current circuit or where only one electromagnetic valve is available then the signal shown in Fig. 5a is subsequently sent from the electronic control unit 15 to the control device 4 or to the limiting device 5. The signal shown in Fig. 5a is dependent on the parameters recorded via the sensor inputs 16. This signal activates the control device 4 for a period predetermined by the signal.
The mode of action of the control device 5 and the auxiliary device 10 is shown in Figs. 5b and 5c. The control device 4 controls the final controlling element 3 in a manner, dependent on the signal shown in Fig. 5a, such that the current in the controlled electromagnetic valve continually rises, in particular to a threshold value S1, shown in Fig. 5b. Once the threshold value Sl has been reached it is maintained at a constant value for a specified period. This threshold value is kept constant until such time as the device 8 has recognised a complete change in the movement of the electromagnetic valve. Once this complete change has occurred, a signal (impact signal) shown in Fig. 5d is generated and emitted by the device 8. Moreover, the threshold value Sl can be kept constant until such time as the control device 4 is deactivated by the signal shown in Fig. 5a or until a maximum duration of activatlon, which may, for instance, be preset in the limiting device 5, is exceeded. Once the impact signal has been emitted by the device 8, the final controlling element 3 is controlled by the control device 4 such that the current drops below the threshold value S1 after the preset period and is then controlled in pulse fashion. The pulse mode of control is facilitated by the corresponding control of the final controlling element 3.With the final controlling element 3 in the open position, the current flow through the electromagnetic valve 2 is maintained by the auxiliary device 10, activated by the signal shown in Fig. 5c. The auxiliary device 10 may, for instance, take the form of a controllable switch. To this end, the auxiliary device 10 is connected to the device 8 or to the current measuring device 6, via the connection C-D.
Activation may, for instance, be effected at a point in times at which the current flowing through the electromagnetic valve falls below a further threshold value S3 which can be preset. Once the current has fallen below this threshold value S3, current flow is restored until such time as a further threshold value S2 has been reached. The threshold values S1 to S3 may be recognised by the current measuring device 6 and are preferentially preset in the control device 4 or the limiting device 5. Once the threshold value S2 has been reached the current is switched off (in particular by the final controlling element 3).Once the final controlling element 3 has been turned off, the drop in current will be held in check by the activated auxiliary device 10 in a manner governed by Lenz's Law and the current flow maintained, so that no energy is withdrawn from the voltage source during this period and energy is thus spared. If the current falls below the threshold value S3, the final controlling element 3 is again activated by the control device 4 and the pulse mode of control may resume again. The aforementioned threshold values S2 and S3 lie above the holding current of the electromagnetic valve. The movement of the anchor of the controlled electromagnetic valve is shown in Fig. 5e.Once the control device 4 has been activated, and thus current flows through the final controlling element 3, a period of time will elapse, as indicated in Fig. 5e, until, in particular, the magnetic field is created and the mechanical friction has been overcome. Once these effects have been overcome, the anchor of the electromagnetic valve 2 moves from a first free position to a second free position. Once this second free position has been reached this is recorded by the device 8 and an impact signal released as shown in Fig. 5d. After disconnection of the current, the anchor reverts in a delayed fashion to its first free position, whereby the delay can be allowed for by corresponding control of the electromagnetic valve since there will be an unwanted injection of fuel during this delay.
To avoid a deleterious effect on the operation of, or damage to, the internal combustion engine or the output stage 2, a diagnostic device 11 is advantageously arranged within output stage 1. In a first embodiment, the diagnostic device 11 is fed current which is measured by the current measuring device 6. This measured current can be directly evaluated by the diagnostic device 11. Moreover, there is the possibility of using temporal changes of the current, in particular the current integral or rate of increase in current, for diagnostic purposes. If these parameters exhibit abnormai values then the diagnostic device triggers the further switching device 12, which then, for instance, interrupts the entire voltage supply and thereby avoids damage.If the switching device 9 is contained in output stage 1, then, in the event of disruption, that valve exhibiting abnormal characteristics may be switched off through the use of suitable software measures initiated by the electronic control unit 15, which correspondingly controls the switching device 9.
This still enables adequate operation of the internal combustion engine. Moreover, there is a feedback signal from the diagnostic device 11 to the electronic control unit 15 which influences the control device 4 in such a way that normal values are restored for the named parameters. It is furthermore plausible for the impact signal captured by the device.8 ta be used for diagnostic purposes and for it to be fed back to the diagnostic device 11 or to the electronic control unit . Further, the clock frequency generated by the pulse control of the electromagnetic valve, the current flow, or the voltage applied to the auxiliary device 10 can all be evaluated and used for diagnostic purposes.
So, for instance, an increased rate at which current rises shortly after activation of the control device 4 points to the coil of the electromagnetic valve 2 being bypassed, for example, because of a short-circuit. The same error leads, for example, during the pulse control of the controlled electromagnetic valve, to an elevated clock frequency and thus to a loss of the voltage applied to the auxiliary device 10. Moreover, by integration of the current, it can be ascertained whether the coil current cannot be properly disconnected if the integration value exceeds a preset value and the control device 4 has already been deactivated again by the signal shown in Fig. 5a.In this case the electromagnetic valve is controlled through a continuous current which is recognised by the diagnostic device 11 and which can lead to the voltage supply being disconnected through the switching device 9 or through the further switching device 12.
Fig. 6 shows a device according to the invention with an auxiliary device, having a means of comparison and a switching device. Aside from the components shown in the preceding Figures and designated by the same reference numbers, Fig. 6 shows the arrangement of the device 8 which records the movement of the electromagnetic valve 2 in the current circuit, said device 8 being connected on the output side to the auxiliary device 10.
The auxiliary device 10 is provided with a means of comparison 13 and a switching device 14. Connection of the current measuring device 6 and the device 8 to the electronic control unit 15 is equally possible.
In 9 particular embodiment of the invention, the output signal (impact signal) of the device 8 is fed back to the electronic control unit 15 and is used for regulation of the point in time of fuel injection. Since, for instance, a low voltage supply will result in the impact signal being generated at a later point in time, the voltage supply can be taken into consideration in the calculation and setting of the point in time of fuel injection.
Furthermore, a switch which increases the voltage applied to the electromagnetic valve or its current (for instance through an energy storage mechanism) is also plausible, thereby bringing about an acceleration of the movement of the electromagnetic valve. This switch is advantageously activated during the starting-up procedure or under extreme temperature conditions, particularly at low temperatures.
Claims (20)
1. Device, in particular the output stage of an electronic fuel injection device of an internal combustion engine, for the control of at least one electromagnetic valve, connected to an electronic control unit and having a device to record the movement of the electromagnetic valve, whereby said electromagnetic valve and a final controlling element lie in one current circuit, characterised in that a control device (4) controls the final controlling element (3), whereby a parameter of the current circuit is fed to the control device (4).
2. Device according to Claim 1, characterised in that the control device (4) is a current controlling device and the parameter is the current flowing in the current circuit.
3. Device according to one of Claims 1 or 2, characterised in that the output stage (1) has a current measuring device (6), in particular using a resistance (7) arranged in the current circuit, to measure the current flowing through the current circuit.
4. Device according to one of Claims 1 to 3, characterised in that the control device (4) is connected to the electronic control unit (15) and the current measuring device (6).
5. Device according to one of Claims 1 or 4, characterised in that the control device (4) is connected to a limiting device (5).
6. Device according to one of the above Claims, characterised in that the device (8) which records the movement of the electromagnetic valve (2) is connected to the control device (4) on the output side.
7. Device according to one of the above Claims, characterised in that the output stage (1) has a diagnostic device (11) which controls a switching device.
8. Device, in particular the output stage of an electronic fuel injection device of an internal combustion engine, for the control of at least one electromagnetic valve, connected to an electronic control unit and having a device to record the movement of the electromagnetic valve, whereby said electromagnetic valve and a final controlling element lie in one current circuit, in particular according to one of the above
Claims, characterised in that a switching device (9), controlled by the electronic control unit (15), is arranged in the current circuit, whereby each magnetic valve (2.1 to 2.n) is separately switchable through a switch in the switching device (9).
9. Device according to Claim 8, characterised in that the switches are alternately switchable.
10. Device according to one of the above Claims, characterised in that the switching device (9) is connected to the electronic control unit (15) via a data line.
11, Device, in particular the output stage of an electronic fuel injection device of an internal combustion engine, for the control of at least one electromagnetic valve, connected to an electronic control unit and having a device to record the movement of the electromagnetic valve, whereby said electromagnetic valve and a final controlling element lie in one current circuit, in particular according to one of the above
Claims, characterised in that an auxiliary device (10) is assigned to the valve (2) to influence a parameter of the current circuit.
12. Device according to Claim 11, characterised in that the auxiliary device (10)- is assigned to the device (8) for the recording of the movement of the electromagnetic valve (2).
13. Device according to one of the above Claims, characterised in that the auxiliary device (10) is assigned to the device (6) for recording the parameter of the current circuit.
14. Device according to one of the above Claims, characterised in that the auxiliary device (10) has a means (13) for a comparison of the recorded parameter with at least one limiting value which may be preset.
15. Device according to one of the above Claims, characterised in that the auxiliary device (10) has a switching device (14), the operation of which is contingent upon the outcome of the comparison.
16. Device according to one of the above Claims, characterised in that the auxiliary device (10) is connected to the control device (4) which influences the final controlling element (3).
17. Process for the control of at least one electromagnetic valve, in particular for the control of the output stage of an electronic fuel injection device of an internal combustion engine, whereby the output stage is connected to an electronic control unit and the movement of the electromagnetic valve is recorded, characterised in that an electrical parameter characterising the valve (2) is increased to a limiting value which can be preset, in a manner dependent upon a signal generated by the electronic control unit (15), and is then kept constant upon reaching that value.
18. Device according to Claim 17, characterised in that the limiting value is held constant for a period of time which can be preset.
19. Device according to Claim 18, characterised in that the parameter, after elapse of the preset time, drops below the limiting value and/or is controlled in a pulse manner.
20. Device according to one of Claims 17 to 19, characterised in that the parameter, in particular the time integral or other temporal change of the parameter, is used to carry out a diagnosis.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914130712 DE4130712A1 (en) | 1991-09-14 | 1991-09-14 | Driver for electromagnetic fuel injection valve - has ancillary circuit that responds when valve is fully open to reduce drive current, to hold level |
| DE19914130711 DE4130711A1 (en) | 1991-09-14 | 1991-09-14 | Electromagnetic actuator driver for IC engine fuel injector - measures current and valve displacement to allow current to be reduced once valve has fully responded |
| DE19914130710 DE4130710A1 (en) | 1991-09-14 | 1991-09-14 | Drive circuit for electromagnetic fuel injection valves - has single power drive stage operating several valves via multiplexing controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9219440D0 GB9219440D0 (en) | 1992-10-28 |
| GB2260030A true GB2260030A (en) | 1993-03-31 |
Family
ID=27202920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9219440A Withdrawn GB2260030A (en) | 1991-09-14 | 1992-09-14 | Control systems for electromagnetic valves |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2260030A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0663552A1 (en) * | 1993-12-22 | 1995-07-19 | Westinghouse Electric Corporation | Solenoid operated valve diagnostic system |
| GB2335797A (en) * | 1998-03-11 | 1999-09-29 | Dunlop Ltd | Control system for an electrically powered actuator |
| GB2367962A (en) * | 2000-10-14 | 2002-04-17 | Trw Ltd | A single current sensor for several solenoids in a hydraulic braking system |
| EP1582725A1 (en) * | 2002-12-10 | 2005-10-05 | Mikuni Corporation | Fuel-injection control method and apparatus |
| US8881903B2 (en) | 2012-08-15 | 2014-11-11 | Multi Packaging Solutions, Inc. | Container with labeling device |
| CN104662275A (en) * | 2012-09-26 | 2015-05-27 | 德尔福国际运营卢森堡有限公司 | Diagnostic circuit of a fluid injector and method for diagnosing a fault |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4148090A (en) * | 1977-02-08 | 1979-04-03 | Nippon Soken, Inc. | Apparatus for controlling an electromagnetic valve |
| EP0225444A1 (en) * | 1985-12-05 | 1987-06-16 | Audi Ag | Process for the control of an electromagnet |
| US4770178A (en) * | 1986-05-15 | 1988-09-13 | Vdo Adolf Schindling Ag | Method and circuit arrangement for controlling an injection valve |
| GB2205198A (en) * | 1987-05-09 | 1988-11-30 | Gewerk Eisenhuette Westfalia | Monitoring the operation of electromagnetic fluid valves |
| US4823825A (en) * | 1985-04-25 | 1989-04-25 | Buechl Josef | Method of operating an electromagnetically actuated fuel intake or exhaust valve of an internal combustion engine |
-
1992
- 1992-09-14 GB GB9219440A patent/GB2260030A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4148090A (en) * | 1977-02-08 | 1979-04-03 | Nippon Soken, Inc. | Apparatus for controlling an electromagnetic valve |
| US4823825A (en) * | 1985-04-25 | 1989-04-25 | Buechl Josef | Method of operating an electromagnetically actuated fuel intake or exhaust valve of an internal combustion engine |
| EP0225444A1 (en) * | 1985-12-05 | 1987-06-16 | Audi Ag | Process for the control of an electromagnet |
| US4770178A (en) * | 1986-05-15 | 1988-09-13 | Vdo Adolf Schindling Ag | Method and circuit arrangement for controlling an injection valve |
| GB2205198A (en) * | 1987-05-09 | 1988-11-30 | Gewerk Eisenhuette Westfalia | Monitoring the operation of electromagnetic fluid valves |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0663552A1 (en) * | 1993-12-22 | 1995-07-19 | Westinghouse Electric Corporation | Solenoid operated valve diagnostic system |
| US5524484A (en) * | 1993-12-22 | 1996-06-11 | Westinghouse Electric Corporation | Solenoid operated valve diagnostic system |
| GB2335797A (en) * | 1998-03-11 | 1999-09-29 | Dunlop Ltd | Control system for an electrically powered actuator |
| GB2367962A (en) * | 2000-10-14 | 2002-04-17 | Trw Ltd | A single current sensor for several solenoids in a hydraulic braking system |
| GB2367962B (en) * | 2000-10-14 | 2004-07-21 | Trw Ltd | Multiple channel solenoid current monitor |
| EP1582725A1 (en) * | 2002-12-10 | 2005-10-05 | Mikuni Corporation | Fuel-injection control method and apparatus |
| EP1582725A4 (en) * | 2002-12-10 | 2006-01-25 | Mikuni Kogyo Kk | Fuel-injection control method and apparatus |
| US8881903B2 (en) | 2012-08-15 | 2014-11-11 | Multi Packaging Solutions, Inc. | Container with labeling device |
| CN104662275A (en) * | 2012-09-26 | 2015-05-27 | 德尔福国际运营卢森堡有限公司 | Diagnostic circuit of a fluid injector and method for diagnosing a fault |
| CN104662275B (en) * | 2012-09-26 | 2017-04-12 | 德尔福国际运营卢森堡有限公司 | Diagnostic circuit of a fluid injector and method for diagnosing a fault |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9219440D0 (en) | 1992-10-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |