CN109386419B - Method, device and control unit for valve closing time monitoring and machine readable medium - Google Patents
Method, device and control unit for valve closing time monitoring and machine readable medium Download PDFInfo
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- CN109386419B CN109386419B CN201710674780.1A CN201710674780A CN109386419B CN 109386419 B CN109386419 B CN 109386419B CN 201710674780 A CN201710674780 A CN 201710674780A CN 109386419 B CN109386419 B CN 109386419B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 239000000446 fuel Substances 0.000 claims abstract description 41
- 230000005284 excitation Effects 0.000 claims abstract description 22
- 230000006698 induction Effects 0.000 claims abstract description 9
- 230000001939 inductive effect Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013480 data collection Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention relates to a method, a device and a control unit for valve closing time monitoring, the method comprising: when an electromagnetic coil in the oil injector is stopped from supplying exciting current, controlling a switch for short-circuiting the electromagnetic coil to be closed so that the electromagnetic coil can generate induction current through an alternating magnetic field caused by induction of eddy current in an armature assembly of the oil injector; calculating a time length from a time when the electromagnetic coil is stopped from being supplied with the excitation current to a time when the induced current flowing through the electromagnetic coil is maximum as an actual valve closing time of the injector; determining that a valve closing time of the injector is shifted if the actual valve closing time is different from a reference valve closing time of the injector; and sending a message to the server indicating that the valve closing time of the fuel injector is offset. With the method, the device and the control unit, whether the valve closing time of the fuel injector for the vehicle is deviated or not can be detected.
Description
Technical Field
The present invention relates to fuel injectors for vehicles, and more particularly to methods, devices and control units for valve closure time monitoring and machine readable media.
Background
Engines for large vehicles, such as trucks or buses, are usually equipped with fuel injectors for supplying fuel to the combustion chambers of the engine during operation of the engine.
A fuel injector for a large vehicle includes at least a solenoid coil, an armature assembly, a needle valve, and a nozzle tip. When the injector is required to supply fuel to the engine, the solenoid coil of the injector is supplied with an energizing current to generate a magnetic field that will lift the armature assembly of the injector upward away from the initial position so that high pressure fuel can lift the needle valve of the injector to be injected from the nozzle tip of the injector into the combustion chamber of the engine. After fuel is not required to be supplied to the engine by the injector, energizing current to the solenoid of the injector is stopped so that no magnetic field is generated, the lifted armature assembly slides down back to its initial position, and the needle valve seats to prevent fuel from being ejected from the nozzle of the injector. The time required for the armature assembly of the fuel injector to return to its initial position from a position where it is lifted when the solenoid coil of the fuel injector is supplied with energizing current is referred to as the valve closing time of the fuel injector.
The valve closing time of the injector may affect the fuel injection quantity accuracy of the injector. The injector has the reference valve closing time just before the delivery, but the actual valve closing time of the injector deviates from the reference valve closing time as the injector ages and wears with use of the injector, thereby reducing the fuel injection quantity accuracy of the injector. When the valve closing time of the fuel injector deviates, the user of the vehicle should be informed of the situation in time so that the user can take measures to eliminate the valve closing time deviation of the fuel injector.
However, there is currently no technique for a user to know that a valve closing timing shift has occurred in an injector of a vehicle.
Disclosure of Invention
Embodiments of the present invention provide methods, apparatus and control units for valve closing time monitoring and machine readable media that can help a user know that valve closing times of fuel injectors of a vehicle have shifted.
A method for valve closing time monitoring according to an embodiment of the invention comprises: when an electromagnetic coil in an oil injector for a vehicle is stopped from supplying excitation current, controlling a switch for short-circuiting the electromagnetic coil to be closed so that the electromagnetic coil can generate induction current by inducing an alternating magnetic field caused by eddy current in an armature assembly of the oil injector; calculating a time length from a time when the electromagnetic coil is stopped from being supplied with the excitation current to a time when the induced current flowing through the electromagnetic coil is maximum as an actual valve closing time of the injector; determining that a valve closing time of the injector is shifted if the actual valve closing time is different from a reference valve closing time of the injector; and sending a message to a server indicating that a valve closing time of the fuel injector is shifted.
An apparatus for valve closure time monitoring according to an embodiment of the present invention includes: a control module for controlling a switch for shorting a solenoid coil to be closed when the solenoid coil in an injector for a vehicle is stopped from supplying an excitation current, so that the solenoid coil can generate an induction current by inducing an alternating magnetic field caused by an eddy current in an armature assembly of the injector; a calculation module for calculating a time length from a time when the solenoid coil is stopped from being supplied with the excitation current to a time when the induced current flowing through the solenoid coil is maximum, as an actual valve closing time of the injector; a determination module to determine that a valve closing time of the injector is offset if the actual valve closing time is different from a reference valve closing time of the injector; and the sending module is used for sending a message for indicating that the valve closing time of the fuel injector deviates to a server.
A control unit according to an embodiment of the present invention includes: a processor; and a memory storing executable instructions that, when executed, cause the processor to perform the aforementioned method.
A machine-readable medium according to an embodiment of the invention stores executable instructions that, when executed, cause a machine to perform the foregoing method.
A system for valve closure time monitoring according to an embodiment of the invention, comprising: a switch for shorting a solenoid coil in a fuel injector for a vehicle such that the solenoid coil forms a closed loop through the switch when the switch is closed; a sensor for measuring the magnitude of current flowing through the electromagnetic coil when the switch is closed; and a control unit connected to the switch and the sensor, for: controlling the switch to close when the electromagnetic coil is stopped from supplying the excitation current so that the electromagnetic coil can generate an induction current by inducing an alternating magnetic field caused by an eddy current in an armature assembly of the oil jet; calculating a time length from a time when the electromagnetic coil is stopped from being supplied with the excitation current to a time when the induced current measured by the sensor is maximum as an actual valve closing time of the injector; determining that a valve closing time of the injector is shifted if the actual valve closing time is different from a reference valve closing time of the injector; and sending a message to a server indicating that a valve closing time of the fuel injector is shifted.
As can be seen from the above, the solution of the embodiment of the present invention detects whether the valve closing time of the injector is shifted by using the induced current in the solenoid coil of the injector for a vehicle and transmits a message indicating that the valve closing time of the injector is shifted to the server when the shift occurs, so that the server timely informs a user of the vehicle that the valve closing time of the injector is shifted, and thus, the solution of the embodiment of the present invention can help the user to know that the valve closing time of the injector of the vehicle is shifted.
Drawings
The features, characteristics, advantages and benefits of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.
FIG. 1 shows an architectural schematic of a system for valve closure time monitoring according to one embodiment of the present invention.
FIG. 2 shows a flow diagram of a method for valve closing time monitoring according to an embodiment of the invention.
FIG. 3 shows a flow diagram of a method for valve closing time monitoring according to an embodiment of the invention.
FIG. 4 shows a schematic diagram of an apparatus for valve closure time monitoring according to an embodiment of the present invention.
Fig. 5 shows a schematic diagram of a control unit according to an embodiment of the invention.
Detailed Description
Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an architectural schematic of a system for valve closure time monitoring according to one embodiment of the present invention. The system 10 for valve closing time monitoring shown IN fig. 1 can detect whether the valve closing time of the fuel injector IN for a large vehicle is shifted.
As shown in fig. 1, the system 10 may include a switch 20, a sensor 30, and a control unit 40. Both ends of switch 20 are connected to the solenoid of injector IN (i.e., shorting the solenoid of injector IN) such that when switch 20 is closed, the solenoid of injector IN forms a closed circuit through switch 20. Sensor 30 is used to measure the magnitude of the current flowing through the solenoid of injector IN when switch 20 is closed.
The control unit 40 is connected to the switch 20 and the sensor 30 and may communicate with a server 50 (which may be provided in the cloud) through a network (not shown). When the solenoid coil of the fuel injector IN is supplied with an energizing current, eddy currents are generated on the armature assembly of the fuel injector IN, which will induce an alternating magnetic field. When the solenoid coil of the injector IN is stopped from supplying the excitation current, the control unit 40 controls the switch 20 to be closed, so that the solenoid coil of the injector IN forms a closed loop by the switch 20, and due to the presence of the closed loop, the solenoid coil of the injector IN can generate an induction current by inducing an alternating magnetic field caused by an eddy current on the armature assembly of the injector IN. Then, the control unit 40 calculates a time length from a time when the solenoid coil of the injector IN is stopped from supplying the excitation current to a time when the induced current flowing through the solenoid coil of the injector IN measured by the sensor 30 is maximum, as the actual valve-closing time of the injector IN. The control unit 40 judges whether the calculated actual valve-closing time is the same as the reference valve-closing time of the injector IN. If not, the control unit 40 determines that the valve-closing timing of the injector IN is shifted. Then, the control unit 40 sends a message indicating that the valve-closing time of the injector IN is shifted to the server 50, so that the server 50 can send the message to a terminal of a user of the vehicle, such as a mobile phone or the like, to inform the user that the valve-closing time of the injector IN is shifted, so that the user can take corresponding measures to eliminate the valve-closing time shift of the injector IN. In other embodiments, the server 50 may collect only the information given by the control unit 40 for big data collection. The information transmission between the control unit 40 and the server 50 may be wire transmission, or may be wireless transmission using a vehicle information transmission unit (CCU) or the like on the vehicle.
FIG. 2 shows a flow diagram of a method for valve closing time monitoring according to an embodiment of the invention. The method 200 of FIG. 2 is described in detail below in conjunction with the system 10 shown in FIG. 1.
At block 202, when the solenoid coil of injector IN is deactivated from supplying energizing current, control unit 40 controls switch 20 to close so that the solenoid coil of injector IN is able to generate an induced current by inducing an alternating magnetic field caused by eddy currents IN the armature assembly of injector IN.
At block 204, control unit 40 records a time T1 at which the solenoid of injector IN is deactivated to supply energizing current.
At block 206, control unit 40 receives the value of the current induced IN the solenoid coil flowing through injector IN as measured by sensor 30.
In block 208, the control unit 40 finds the maximum current value M from the received current values.
In block 210, the control unit 40 determines the instant T2 at which the maximum current value M occurs.
At block 212, the control unit 40 calculates the difference between time T1 and time T2 as the actual valve closing time of the fuel injector IN.
IN block 214, the control unit 40 determines whether the calculated actual valve-closing time and the reference valve-closing time of the injector IN are the same.
If the determination at block 214 is positive, the valve closing time of injector IN is not biased and the process ends.
IN block 216, if the determination IN block 214 is negative, the control unit 40 determines that the valve-closing timing of the fuel injector IN is shifted.
At block 218, the control unit 40 sends a message to the server 50 indicating that the valve closing time of the fuel injector IN is shifted. Upon receipt of the message, server 50 may send the message to a terminal, such as a cell phone, of a user of the vehicle to inform the user that the valve closing time of fuel injector IN is offset so that the user may take appropriate action to eliminate the valve closing time offset of fuel injector IN.
As can be seen from the above description, in the present embodiment, whether the valve closing time of the injector is shifted is detected using the induced current in the solenoid coil of the injector for the vehicle and a message indicating that the valve closing time of the injector is shifted is sent to the server when the shift occurs, so that the server timely informs a user of the vehicle that the valve closing time of the injector is shifted, and thus, the solution of the present embodiment can help the user to know that the valve closing time of the injector for the vehicle is shifted.
Other variants
It should be understood by those skilled IN the art that although IN the above embodiment, the actual valve closing time of injector IN is calculated by recording the timing T1 at which the solenoid coil of injector IN is stopped from supplying the energizing current and the timing T2 at which the value of the induced current flowing through the solenoid coil of injector IN is determined to be maximum, the present invention is not limited thereto. IN other embodiments of the present invention, the control unit 40 may start the timer for counting when the solenoid coil of the injector IN is stopped from supplying the excitation current, and then acquire the time recorded by the timer when the current value of the induced current flowing through the solenoid coil of the injector IN is maximum as the actual valve-closing time of the injector IN.
It will be appreciated by those skilled in the art that the aspects of the above embodiments are applicable not only to injectors for large vehicles, but also to injectors for various vehicles.
FIG. 3 shows a flow diagram of a method for valve closing time monitoring according to an embodiment of the invention. The method 300 shown in fig. 3 may be implemented, for example, but not limited to, by the control unit 40.
As shown in FIG. 3, method 300 may include, at block 302, controlling a switch for shorting a solenoid coil in a fuel injector for a vehicle to close when the solenoid coil is deactivated from supplying an energizing current to enable the solenoid coil to generate an induced current by inducing an alternating magnetic field caused by an eddy current in an armature assembly of the fuel injector.
The method 300 may further include, at block 308, sending a message to a server indicating that a valve closing time of the fuel injector is offset.
In one aspect, block 304 may comprise: recording the time when the electromagnetic coil is stopped from supplying the excitation current; measuring a current value of the induced current flowing through the electromagnetic coil using a sensor; detecting the moment when the current value is maximum; and calculating a difference between the detected time and the recorded time as the actual valve closing time.
In another aspect, the server notifies a user of the vehicle of information about an offset in valve closing time after receiving the message
FIG. 4 shows a schematic diagram of an apparatus for valve closure time monitoring according to an embodiment of the present invention. The apparatus 400 for motion tracking shown in fig. 4 may be implemented by software, hardware or a combination of software and hardware, and may be installed in the control unit 40, for example, but not limited thereto.
As shown in fig. 4, the apparatus 400 may include a control module 402, a calculation module 404, a determination module 406, and a transmission module 408. The control module 402 is configured to control a switch for shorting a solenoid coil in an injector for a vehicle to close when the solenoid coil is deactivated from supplying an energizing current such that the solenoid coil is capable of generating an induced current by inducing an alternating magnetic field caused by eddy currents in an armature assembly of the injector. The calculation module 404 is configured to calculate a length of time from a time when the solenoid coil is stopped from supplying the excitation current to a time when the induced current flowing through the solenoid coil is maximum as an actual valve closing time of the injector. The determination module 406 is configured to determine that a valve closing time of the injector is offset if the actual valve closing time is different than a reference valve closing time of the injector. The sending module 408 is configured to send a message to a server indicating that a valve closing time of the fuel injector is shifted.
In one aspect, the calculation module 404 includes: means for recording the time at which the solenoid coil is stopped from supplying the excitation current; means for measuring a current value of the induced current flowing through the electromagnetic coil with a sensor; means for detecting a time at which the current value is maximum; and means for calculating a difference between the detected time and the recorded time as the actual valve closing time.
In another aspect, the server, upon receiving the message, notifies a user of the vehicle of information regarding an offset in valve closing time.
Fig. 5 shows a schematic diagram of a control unit according to an embodiment of the invention. As shown in fig. 5, the control unit 500 may include a processor 502 and a memory 504. Wherein the memory 504 stores executable instructions that, when executed, cause the processor 502 to perform the method 200 of fig. 2 or the method 300 of fig. 3.
Embodiments of the present invention also provide a machine-readable medium having stored thereon executable instructions that, when executed, cause a machine to perform the method 200 shown in fig. 2 or the method 300 shown in fig. 3.
Those skilled in the art will appreciate that various adaptations, modifications, and/or adjustments of the various embodiments disclosed herein may be made without departing from the spirit of the invention, and that such adaptations, modifications, and/or adjustments are within the scope of the invention. The scope of the invention is therefore defined by the appended claims.
Claims (11)
1. A method for valve closing time monitoring, comprising:
when an electromagnetic coil in an oil injector for a vehicle is stopped from supplying excitation current, controlling a switch for short-circuiting the electromagnetic coil to be closed so that the electromagnetic coil can generate induction current by inducing an alternating magnetic field caused by eddy current in an armature assembly of the oil injector;
calculating a time length from a time when the electromagnetic coil is stopped from being supplied with the excitation current to a time when the induced current flowing through the electromagnetic coil is maximum as an actual valve closing time of the injector;
determining that a valve closing time of the injector is shifted if the actual valve closing time is different from a reference valve closing time of the injector; and
sending a message to a server indicating that a valve closing time of the fuel injector is offset.
2. The method of claim 1, wherein said calculating an actual valve closing time of said fuel injector comprises:
recording the time when the electromagnetic coil is stopped from supplying the excitation current;
measuring a current value of the induced current flowing through the electromagnetic coil using a sensor;
detecting the moment when the current value is maximum; and
calculating a difference between the detected time and the recorded time as the actual valve closing time.
3. The method of claim 1 or 2, wherein the server, upon receiving the message, notifies a user of the vehicle of information about an offset in valve closing time.
4. An apparatus for valve closure time monitoring, comprising:
a control module for controlling a switch for shorting a solenoid coil to be closed when the solenoid coil in an injector for a vehicle is stopped from supplying an excitation current, so that the solenoid coil can generate an induction current by inducing an alternating magnetic field caused by an eddy current in an armature assembly of the injector;
a calculation module for calculating a time length from a time when the solenoid coil is stopped from being supplied with the excitation current to a time when the induced current flowing through the solenoid coil is maximum, as an actual valve closing time of the injector;
a determination module to determine that a valve closing time of the injector is offset if the actual valve closing time is different from a reference valve closing time of the injector; and
and the sending module is used for sending a message for indicating that the valve closing time of the fuel injector deviates to a server.
5. The apparatus of claim 4, wherein the computing module comprises:
means for recording the time at which the solenoid coil is stopped from supplying the excitation current;
means for measuring a current value of the induced current flowing through the electromagnetic coil with a sensor;
means for detecting a time at which the current value is maximum; and
means for calculating a difference between the detected time and the recorded time as the actual valve closing time.
6. The apparatus of claim 4 or 5, wherein the server, upon receiving the message, notifies a user of the vehicle of information about an offset in valve closing time.
7. A control unit, comprising:
a processor; and
a memory storing executable instructions that, when executed, cause the processor to perform the method of any of claims 1-3.
8. A machine-readable medium storing executable instructions that, when executed, cause a machine to perform the method of any one of claims 1-3.
9. A system for valve closure time monitoring, comprising:
a switch for shorting a solenoid coil in a fuel injector for a vehicle such that the solenoid coil forms a closed loop through the switch when the switch is closed;
a sensor for measuring the magnitude of current flowing through the electromagnetic coil when the switch is closed; and
a control unit connected with the switch and the sensor for: controlling the switch to close when the electromagnetic coil is stopped from supplying the excitation current so that the electromagnetic coil can generate an induction current by inducing an alternating magnetic field caused by an eddy current in an armature assembly of the fuel injector; calculating a time length from a time when the electromagnetic coil is stopped from being supplied with the excitation current to a time when the sensor measures that the induced current flowing through the electromagnetic coil is maximum, as an actual valve closing time of the injector; determining that a valve closing time of the injector is shifted if the actual valve closing time is different from a reference valve closing time of the injector; and sending a message to a server indicating that a valve closing time of the fuel injector is shifted.
10. The system of claim 9, wherein the server is in a cloud, and the control unit and the server transmit information through a vehicle information transmission unit.
11. The system of claim 9, wherein said calculating an actual valve closing time of said fuel injector comprises:
recording the time when the electromagnetic coil is stopped from supplying the excitation current;
measuring a current value of the induced current flowing through the electromagnetic coil using the sensor;
detecting a time when the measured current value is maximum; and
calculating a difference between the detected time and the recorded time as the actual valve closing time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710674780.1A CN109386419B (en) | 2017-08-09 | 2017-08-09 | Method, device and control unit for valve closing time monitoring and machine readable medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710674780.1A CN109386419B (en) | 2017-08-09 | 2017-08-09 | Method, device and control unit for valve closing time monitoring and machine readable medium |
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| CN109386419A CN109386419A (en) | 2019-02-26 |
| CN109386419B true CN109386419B (en) | 2021-12-21 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5053911A (en) * | 1989-06-02 | 1991-10-01 | Motorola, Inc. | Solenoid closure detection |
| CN102297065A (en) * | 2011-08-30 | 2011-12-28 | 潍柴动力股份有限公司 | Oil sprayer with closing time deviation compensation |
| WO2012038543A1 (en) * | 2010-09-24 | 2012-03-29 | Continental Automotive Gmbh | Determining the closing time of a control valve of an indirectly driven fuel injector |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010014825A1 (en) * | 2010-04-13 | 2011-10-13 | Continental Automotive Gmbh | Method for operating an injection system and an injection system, which has an injection valve and a control device |
| DE102010018290B4 (en) * | 2010-04-26 | 2016-03-31 | Continental Automotive Gmbh | Electrical control of a valve based on a knowledge of the closing time of the valve |
| DE102013203130A1 (en) * | 2013-02-26 | 2014-08-28 | Robert Bosch Gmbh | Method for controlling an injection process of a magnet injector |
| CN203925852U (en) * | 2014-06-13 | 2014-11-05 | 天津大学 | A kind of oil-fuel injector needle-valve system for measuring responsive time |
| CN109839555B (en) * | 2017-11-29 | 2023-05-02 | 罗伯特·博世有限公司 | Method, device and control unit for wear monitoring and machine readable medium |
-
2017
- 2017-08-09 CN CN201710674780.1A patent/CN109386419B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5053911A (en) * | 1989-06-02 | 1991-10-01 | Motorola, Inc. | Solenoid closure detection |
| WO2012038543A1 (en) * | 2010-09-24 | 2012-03-29 | Continental Automotive Gmbh | Determining the closing time of a control valve of an indirectly driven fuel injector |
| CN102297065A (en) * | 2011-08-30 | 2011-12-28 | 潍柴动力股份有限公司 | Oil sprayer with closing time deviation compensation |
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| CN109386419A (en) | 2019-02-26 |
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