CN112136257A - Device for detecting a fault current in a vehicle actuator having a control unit - Google Patents
Device for detecting a fault current in a vehicle actuator having a control unit Download PDFInfo
- Publication number
- CN112136257A CN112136257A CN201980031721.XA CN201980031721A CN112136257A CN 112136257 A CN112136257 A CN 112136257A CN 201980031721 A CN201980031721 A CN 201980031721A CN 112136257 A CN112136257 A CN 112136257A
- Authority
- CN
- China
- Prior art keywords
- control unit
- current
- actuator
- logic
- current flowing
- 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.)
- Pending
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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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/02—Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
- B60W50/0205—Diagnosing or detecting failures; Failure detection models
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
- H02H3/30—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
- H02H3/305—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel involving current comparison
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/02—Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
- B60W50/0205—Diagnosing or detecting failures; Failure detection models
- B60W2050/022—Actuator failures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2306/00—Other features of vehicle sub-units
- B60Y2306/15—Failure diagnostics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2400/00—Special features of vehicle units
- B60Y2400/30—Sensors
- B60Y2400/308—Electric sensors
- B60Y2400/3084—Electric currents sensors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Human Computer Interaction (AREA)
- Transportation (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to a device for detecting a fault current in a vehicle actuator, preferably a clutch or transmission actuator, having a control unit, comprising a sensor device (19, 21, 26) for measuring a current that can be compared with a reference current. In a device which can reliably detect high-ohmic short circuits, the logic unit (17) monitors the current consumption and the current output of the actuator (16) and evaluates the associated fault.
Description
Technical Field
The invention relates to a device for detecting a fault current in a vehicle actuator, preferably a clutch or transmission actuator, having a control unit, comprising a sensor device for measuring a current that can be compared with a reference current.
Background
DE 102007039855 a1 discloses a method and a circuit for determining the current consumed by an electric motor, in which the voltage dropped across a measuring resistor in the supply line of the electric motor is continuously detected and compared with a reference voltage.
It is also known to compare a fixed threshold value with the current short-circuit current in order to detect a short circuit of an electrically commutated electric motor, wherein the threshold value is higher than the maximum peak current value of the electric motor. The current measurement is carried out by means of a shunt which is installed in the ground line for the final stage of the control motor. However, this shunt is not suitable for determining the ground current because it is bridged by a short circuit.
In motor vehicle cable harnesses, controllers and actuators of motor vehicles, various fault situations may occur in which a high-ohmic short circuit is formed with respect to the vehicle ground. The magnitude of the fault current is insufficient to trigger the fuse, but sufficient to cause thermal damage. Even an integrated current sensor on the electronic device cannot detect such a short circuit because the fault current can flow away through the conductive housing.
Disclosure of Invention
The object of the present invention is to provide a device for detecting fault currents, which device makes it possible to reliably detect fault currents even in the event of a high-ohmic short circuit and to introduce suitable measures.
According to the invention, the object is achieved by the following method, namely: a logic unit monitors the current consumption and current output of the actuator and analyzes the associated fault. Very low fault currents can also be reliably identified by comparing the current flowing into or out of the actuator.
The logic unit advantageously has a logic circuit which is connected to a first sensor device for measuring the current flowing from the vehicle electrical system into the actuator and to a second sensor device for measuring the current flowing from the actuator back into the vehicle electrical system, wherein the logic circuit detects a fault current when the currents differ. When using such a device, the measuring expenditure is very small, since only two current measuring devices are required, and therefore the design costs are very low. With this arrangement, it is possible to easily detect errors in the electrical system of the motor vehicle, wherein the installation of such an additional logic unit is quick and simple.
In one embodiment, the logic circuit opens a circuit breaker arranged between the vehicle electrical system and the actuator when different currents are detected. Damage due to short-circuit currents in the actuator is thus reliably avoided, since the actuator is no longer supplied with energy.
In one arrangement, the logic is connected to a data line for transmitting an alarm signal. By means of this alarm signal, it is possible to report a short circuit in the interior of the motor vehicle to other electronic devices and thus to alert the operator to the presence of a short circuit.
In one embodiment, the logic unit is arranged between the on-board electrical system and the actuator or the control unit of the actuator. This ensures that, in particular in the current flowing from the control unit, it is also possible to include all the current for controlling the actuator.
Advantageously, the logic unit is a component of the control unit, wherein the first sensor device for monitoring the current flowing into the control unit is arranged at an input of the control unit. With this arrangement, it is also possible to measure the fault current flowing away through the control unit housing. This identifies a high-ohmic short circuit in time.
In one embodiment, a sensor device provided for measuring the current of the power output stage of the control unit is used for measuring the current flowing out of the control unit. Additional sensor devices can thus be dispensed with, thereby further reducing the expenditure required for measuring the fault current.
In a further embodiment, the logic for comparing the current flowing into the control unit with the current flowing out of the control unit is formed by an electronic device present in the control unit. This makes it possible to simply extend a function for the microcontroller present in the control unit to assume the function of the logic, which further reduces the cost of the device.
The invention allows a large number of embodiments. Two of which should be described in detail with reference to the drawings shown in the drawings.
Drawings
Figure 1 is a simplified schematic diagram of a hydraulic clutch actuation system for operating an automatic clutch,
figure 2 a first embodiment of the device according to the invention,
figure 3 a second embodiment of the device according to the invention,
Detailed Description
Fig. 1 shows a simplified diagram of a clutch actuation system for an automatic clutch. In a drive train of a motor vehicle, a hydraulic clutch actuation system 1 is assigned to a clutch 2 and comprises a master cylinder 3 which is connected to a slave cylinder 5 via a hydraulic line 4, also referred to as a pressure line, which contains hydraulic fluid. The slave piston 6 moves back and forth in the slave cylinder 5, and the clutch 2 is operated via an intermediate line of an operating mechanism 7 and a bearing 8. The actuating cylinder 3 can be connected to the compensating tank 9 via a connecting port. An actuating piston 10 is axially movably supported in the actuating cylinder 3. A piston rod 11 extends from the drive piston 10 and is linearly movable together with the drive piston 10 in the longitudinal extension of the drive cylinder 3. The piston rod 11 of the master cylinder 3 is coupled to an electric servo drive 13 via a threaded spindle 12. The electric actuating drive 13 comprises an electric motor 14 designed as a commutating dc motor and a control unit 15. The threaded spindle 12 will convert the rotational movement of the motor 14 into a longitudinal movement of the piston rod 11 and thus of the drive piston 10. The clutch 2 is thus automatically actuated by the electric motor 14, the threaded spindle 12, the master cylinder 3 and the slave cylinder 5, wherein the electric motor 14, the threaded spindle 12 and the master cylinder 3 form a clutch actuator 16.
Fig. 2 shows a first exemplary embodiment of the device according to the invention in the form of a clutch actuator 16, by means of which a high-ohmic short circuit in the clutch actuator 16 can be reliably detected. Upstream of the clutch actuator 16 for controlling the electric motor 14, a logic unit 17 is connected, which is connected to an on-board electrical system 18. The logic unit 17 has a first current sensor 19, which is connected to the clutch actuator 16 via a disconnecting switch 20. The second current sensor 21 is connected between the vehicle ground 22 and the clutch actuator 16. Both the first current sensor 19 and the second current sensor 21 are connected to a logic line 23 which is coupled to a data bus 24 for communication with other control units.
The first current sensor 19 measures the current flowing from the on-board electrical system 18 into the clutch actuator 16, while the second current sensor 21 measures the current flowing from the clutch actuator 16. Both current values are sent to the logic 23, which compares the two currents. When the two currents are different, it is concluded that a high-ohmic short circuit is present, so that the logic circuit 22 opens the disconnection switch 20, disconnecting the clutch actuator 16 from the on-board electrical system 18.
In a second embodiment of the device according to the invention, shown in fig. 3, the logic unit 17 is an integral part of the control unit 15. In this case, the first current sensor 21 is used to measure the current flowing from the on-board electrical system 18 into the control unit 15, is arranged at an input 25 of the control unit 15 and is connected to the logic line 23. The current sensor 26, which is present in itself, is used to measure the current present at the power output 27, which corresponds to the current flowing out of the electric motor 14 in the control unit 15, is coupled to the logic line 23 and is connected at the same time to the ground 22 of the on-board electrical system 18. The logic 23 is formed by an electronic device integrated in the control unit 15, for example a microcontroller, which compares the current flowing into the control unit 15 via the first current sensor 21 with the current flowing out of the electric motor 14, which is measured by the current sensor 26. If there is a deviation, the control unit 15 can detect a fault current and set appropriate measures for protecting the control unit 15 and the clutch actuator 16. In this case, the current sensor 21 can be positioned appropriately in order to be able to detect fault currents on the circuit board, in the power output stage 27 and in the electric machine 14 or only in the power output stage 27 and in the electric machine 14.
Description of the reference numerals
1 Clutch operating System
2 Clutch
3 driving cylinder
4 hydraulic conduit
5 slave cylinder
6 driven piston
7 operating mechanism
8 bearing
9 compensating container
10 active piston
11 piston rod
12 screw spindle
13 Servo driving device
14 motor
15 control unit
16 clutch actuator
17 logic unit
18 vehicle electrical system
19 Current sensor
20 cut-off switch
21 current sensor
22 ground wire
23 logic circuit
24 data bus
25 input terminal
26 Current sensor
And 27 power final stage.
Claims (8)
1. A device for identifying fault currents in vehicle actuators, preferably clutch or transmission actuators, having a control unit, comprising sensor means (19, 21, 26) for measuring a current comparable to a reference current, characterized in that a logic unit (17) monitors the current consumption and current output of the actuator (16) and analyses the associated fault.
2. The device according to claim 1, characterized in that the logic unit (17) has a logic circuit (23) which is connected to a first sensor device (19) for measuring the current flowing from the vehicle electrical system (18) into the actuator (16) and to a second sensor device (21) for measuring the current flowing from the actuator (16) back into the vehicle electrical system (18), wherein the logic circuit (23) identifies a fault current when the currents differ.
3. The device according to claim 2, characterized in that the logic circuit (23) opens a circuit breaker (20) arranged between the vehicle electrical system (18) and the actuator (16) when different currents are found.
4. A device according to claim 2 or 3, characterized in that the logic circuit (23) is connected to a data line (24) for sending an alarm signal.
5. The device according to at least one of the preceding claims, characterized in that the logic unit (17) is arranged between the on-board electrical system (18) and the actuator (16) or a control unit (15) of the actuator (16).
6. The device according to claim 1, characterized in that the logic unit (17) is a component of the control unit (15), wherein the first sensor device (19) for monitoring the current flowing from the on-board electrical system (18) into the control unit (15) is arranged on an input (25) of the control unit (15).
7. A device according to claim 6, characterized in that a sensor device (26) arranged to measure the current of the power final stage (27) of the control unit (15) is used to measure the current flowing from the control unit (15).
8. The device according to claim 6 or 7, characterized in that the logic (23) for comparing the current flowing into the control unit (15) with the current flowing out of the control unit (15) is formed by an electronic device present in the control unit (15).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018114115.7A DE102018114115A1 (en) | 2018-06-13 | 2018-06-13 | Device for detecting a fault current in an actuator of a vehicle having a control unit |
| DE102018114115.7 | 2018-06-13 | ||
| PCT/DE2019/100485 WO2019238161A1 (en) | 2018-06-13 | 2019-06-03 | Device for identifying a fault current in a vehicle actuator comprising a control unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112136257A true CN112136257A (en) | 2020-12-25 |
Family
ID=66951738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980031721.XA Pending CN112136257A (en) | 2018-06-13 | 2019-06-03 | Device for detecting a fault current in a vehicle actuator having a control unit |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR20210019997A (en) |
| CN (1) | CN112136257A (en) |
| DE (2) | DE102018114115A1 (en) |
| WO (1) | WO2019238161A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020207874B4 (en) | 2020-06-24 | 2023-11-23 | Vitesco Technologies GmbH | Current measuring circuit with an evaluation unit and a resistance measuring element |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1586028A (en) * | 2001-09-14 | 2005-02-23 | 海卓-艾尔公司 | Current fault detector and circuit interrupter and packaging thereof |
| DE60018549D1 (en) * | 2000-04-01 | 2005-04-14 | Bosch Gmbh Robert | fuel injection system |
| CN103036494A (en) * | 2011-09-29 | 2013-04-10 | 英飞凌科技股份有限公司 | Diagnosis of over-current conditions in bipolar motor controllers |
| DE102014211738A1 (en) * | 2014-06-18 | 2015-12-24 | Bayerische Motoren Werke Aktiengesellschaft | Residual current monitoring in the power network of a motor vehicle |
| DE102014224639A1 (en) * | 2014-12-02 | 2016-06-02 | Robert Bosch Gmbh | Method and monitoring device for detecting a fault current for a control device for controlling a multiphase actuator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007039855A1 (en) | 2006-09-21 | 2008-04-03 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Method and circuit for determining the maximum current absorbed by an electric motor |
-
2018
- 2018-06-13 DE DE102018114115.7A patent/DE102018114115A1/en not_active Withdrawn
-
2019
- 2019-06-03 WO PCT/DE2019/100485 patent/WO2019238161A1/en active Application Filing
- 2019-06-03 DE DE112019002958.4T patent/DE112019002958A5/en active Pending
- 2019-06-03 KR KR1020207033316A patent/KR20210019997A/en not_active Application Discontinuation
- 2019-06-03 CN CN201980031721.XA patent/CN112136257A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60018549D1 (en) * | 2000-04-01 | 2005-04-14 | Bosch Gmbh Robert | fuel injection system |
| CN1586028A (en) * | 2001-09-14 | 2005-02-23 | 海卓-艾尔公司 | Current fault detector and circuit interrupter and packaging thereof |
| CN103036494A (en) * | 2011-09-29 | 2013-04-10 | 英飞凌科技股份有限公司 | Diagnosis of over-current conditions in bipolar motor controllers |
| DE102014211738A1 (en) * | 2014-06-18 | 2015-12-24 | Bayerische Motoren Werke Aktiengesellschaft | Residual current monitoring in the power network of a motor vehicle |
| DE102014224639A1 (en) * | 2014-12-02 | 2016-06-02 | Robert Bosch Gmbh | Method and monitoring device for detecting a fault current for a control device for controlling a multiphase actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018114115A1 (en) | 2019-12-19 |
| KR20210019997A (en) | 2021-02-23 |
| DE112019002958A5 (en) | 2021-02-25 |
| WO2019238161A1 (en) | 2019-12-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201225 |