EP2148978A1 - Method for indicating states of an electric component to an engine control device of an internal combustion engine - Google Patents
Method for indicating states of an electric component to an engine control device of an internal combustion engineInfo
- Publication number
- EP2148978A1 EP2148978A1 EP08749777A EP08749777A EP2148978A1 EP 2148978 A1 EP2148978 A1 EP 2148978A1 EP 08749777 A EP08749777 A EP 08749777A EP 08749777 A EP08749777 A EP 08749777A EP 2148978 A1 EP2148978 A1 EP 2148978A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control unit
- electrical component
- engine control
- error
- internal combustion
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 25
- 238000002485 combustion reaction Methods 0.000 title claims description 16
- 238000001514 detection method Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims 1
- 238000003745 diagnosis Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
Definitions
- the invention relates to a method for the feedback of states of an electrical see component to an engine control unit of an internal combustion engine with a control unit of the electrical component having means for detecting errors and which is connected via a signal line to the engine control unit and a PWM generated in the engine control unit Receives signal, wherein the control unit pulls the signal line to the feedback of data from the electrical component to the engine control unit to ground.
- Such feedback of conditions for diagnosis are known in that the component pulls the signal line to ground if there is any error. This is detected by the engine control unit, as this serves as the master. At the same time, the engine control unit measures the voltage on the signal line, so that if the engine control unit wants to output a high level, but the line remains low due to the ground connection, this is an indication that either the component is not functioning properly or the line shorted is. In the past, therefore, the switching of the signal line to ground by the electrical component has conventionally been used to tell the engine control unit that an error has occurred.
- a disadvantage of such an embodiment is that only at the occurrence of any error this is reported back to the engine control unit, without being able to actually identify the error. Furthermore, there are no feedbacks regarding the actual state of the electrical component.
- This object is achieved by using the duration of the ground connection to identify the fault. This means that depending on the duration of a connection of the signal line with the ground this can be assigned to exactly one error, whereby the engine control unit can identify this error. For such a solution, only a minimal adaptation to the components used is necessary. This results in a flexible diagnostic functionality, in which only minimal resources in both the control unit of the electrical component and in the external engine control unit are required, since only in the engine control unit, a corresponding comparison code with respect to the length of the transmitted signal must be stored.
- the duration of the ground connection is used in addition to the feedback of the actual value of the electrical component.
- the feedback of an error or the actual state of the electrical component can take place by definition according to successive. Accordingly, it makes sense to not regularly send such feedback to you. dernder control of the electrical component.
- the coding of this actual value of the electrical component can, for example, be linear, so that an on-ground pull over a defined maximum period of for example one second would correspond to a 100% speed, half the time for example a 50% speed , As a result, a hitherto unknown feedback of an actual value of the electrical component to the engine control unit would be realized in a very simple manner.
- the signal line is pulled to ground for a predefined time in order to inform the control unit, which serves as the master, that a feedback occurs.
- the control unit which serves as the master
- the duration of the connection of the signal line to the ground serves as a measure of the actual state of the electrical component if no error occurs, with the connection then being released again by the component. Accordingly, it could be stored in the engine control unit that there is a direct proportionality between the time duration of the ground connection in this second time block and the actual speed.
- the possible errors are classified and assigned to different groups, so that depending on the severity of the error extend the transmission times. Errors with similar consequences for the function of the electrical component are preferably combined to form these groups.
- an error is determined from a group of Errors of the electrical component closed and closed during a subsequent period of time on an error from a group of errors in the system, wherein the connection of the signal line to the ground is maintained until the time defined for the occurring error with the longest identifying period of time has expired.
- a particularly favorable embodiment results when the electrical component is an electromotively operated pump in which the group of errors leading to a reduced operation of the pump is subdivided into a time block for a first speed limit, a time block for a second speed limit, a time block for dry run detection and a time block for power limitation. These time blocks serve as the first and not so serious set of mistakes.
- the group of faults of the electrical component in the case where the electrical component is an electromotive pump includes at least one time block for an over-current pumping fault.
- This pump error thus forms a second group of errors, which is queried for the first group of errors due to the greater weighting.
- This method and the further process steps ensure feedback to the engine control unit about the state of the electrical component in a simple manner.
- By appropriate weighting of the transmitted errors it is possible to initiate any necessary measures.
- such a feedback can take place in the entire period or periodically, as long as there is no change in the control signal.
- the actual engine status can be made available to the engine control unit. For this, the effort in the external control unit is extremely low.
- FIG. 1 shows a typical protocol of a method according to the invention for the feedback of states of an electrical component using the example of a pump.
- Figure 2 shows the flow of the process at a rated speed of the pump of 50% without errors occurring.
- FIG. 3 shows the protocol when an overcurrent fault occurs at the pump.
- FIG. 4 shows a method for feedback in which different modes can be selected, depending on the application.
- the illustrated in the figures method for reporting conditions of an electrical component to a control unit of an internal combustion engine are using the example of a built-in vehicle electric cooling water pump pe explained.
- an engine control unit is arranged, which is connected via a signal line to a control unit of the cooling water pump.
- the control unit contains various means for detecting errors of the pump or for measuring operating conditions.
- Such circuit means are known.
- the speed of a pump can be determined by non-contact sensors.
- the corresponding electrical circuits are also known, for example, for detecting overcurrent, overvoltages or the like.
- This method now offers the possibility of exchanging as much information as possible via the signal line between the control unit of the cooling water pump and the engine control unit.
- the control unit receives a pulse width modulated signal of the engine control unit, in which alternately the signal line has a high or a low level. The different duration of these times is used to control the speed of the pump.
- the control unit of the cooling water pump via a corresponding circuit to pull the signal line to ground, whereby the motor gate controller receives only a low signal as long as the ground connection of the signal line is.
- FIG. 1 shows a typical drive 1 of the engine control unit for the electromotive-operated cooling water pump.
- the control unit is transmitted a PWM signal 2 via the signal line from the engine control unit. If the control unit receives such a signal, the pump is operated with the resulting speed until a possibly changed PWM signal 2 is transmitted via the signal line.
- the control unit pulls the signal line to ground. This can be done at fixed intervals, which can also be chosen very small. This period of time 3, during which the signal line is grounded, is used for the feedback of states, one of which is shown enlarged accordingly. For example, after expiration of a predetermined period of the PWM signal 2, the control unit of the pump pulls the signal line to ground.
- this ground connection is first held 100 ms to tell the engine control unit that a feedback takes place.
- This time span thus forms a synchronization time block 4.
- This is followed, for example, by a time block 5 for the actual speed, which is one second long.
- These two time blocks 4 and 5 are at least partially output at each feedback to be performed and are summarized in a group 6, after which the transmission ends, if no error occurs.
- the sole transfer of the group 6, the pump is fine.
- This group 6 is now followed by a second group 7 for identifying a reduced operation of the pump.
- This consists in the present embodiment of four 100 ms time blocks, the time block 8 is used to detect a first speed limit, the time block 9 for detecting a second speed limit, the time block 10 for detecting a dry run and the time block 11 for detecting a power limit of the pump ,
- this group 12 in the present embodiment consists only of a time block 13 for the detection of overcurrent or plausibility error 13, which is also 100 ms long.
- errors of a group 14 are transmitted, in which system errors are processed one after the other.
- the first time block 15 of the system error identifying an overvoltage
- the second time block 16 the detection of dry running shutdown
- the third time block 17 the detection of a temperature shutdown
- fourth time block 18 the identification of a lack of supply to the relay.
- the engine control unit now recognizes that after 1.6 seconds, the normal connection of the signal line between the engine control unit and the electrical component is restored and is able to determine from a comparison code stored in the engine control unit that obviously there is an overcurrent fault, which is an on-ground pulling over a period of 1, 6 s corresponds. It also becomes clear that if an error occurs, no actual speed can actually be reported back. However, it remains possible for the engine control unit, for example, to pass on an appropriate error message to the driver of a vehicle.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007024562 | 2007-05-25 | ||
DE102007026601A DE102007026601B3 (en) | 2007-05-25 | 2007-06-08 | Method for the feedback of states of an electrical component to an engine control unit of an internal combustion engine |
PCT/EP2008/055147 WO2008145469A1 (en) | 2007-05-25 | 2008-04-28 | Method for indicating states of an electric component to an engine control device of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2148978A1 true EP2148978A1 (en) | 2010-02-03 |
EP2148978B1 EP2148978B1 (en) | 2015-08-05 |
Family
ID=40031052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08749777.2A Active EP2148978B1 (en) | 2007-05-25 | 2008-04-28 | Method for indicating states of an electric component to an engine control device of an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US8392060B2 (en) |
EP (1) | EP2148978B1 (en) |
JP (1) | JP5361873B2 (en) |
DE (1) | DE102007026601B3 (en) |
WO (1) | WO2008145469A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014206277A1 (en) | 2014-04-02 | 2015-10-08 | BSH Hausgeräte GmbH | Home appliance device |
DE102017212630A1 (en) * | 2017-07-24 | 2019-01-24 | Bayerische Motoren Werke Aktiengesellschaft | In at least two alternative modes operable signal communication system for a motor vehicle |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0745863B2 (en) | 1986-06-28 | 1995-05-17 | 本田技研工業株式会社 | Failure transmission device for internal combustion engine controller |
JPS6432593A (en) | 1987-07-28 | 1989-02-02 | Isuzu Motors Ltd | Common processing device for analog sensor |
DE4125678C2 (en) * | 1991-08-02 | 1994-09-22 | Audi Ag | Transmission device for exchanging information with pulse-width-modulated signals between electronic devices in vehicles |
JPH0898284A (en) | 1994-07-25 | 1996-04-12 | Nippondenso Co Ltd | Data receiver, data transmitter and data communication equipment |
JPH1127300A (en) * | 1997-07-04 | 1999-01-29 | Hitachi Ltd | Automobile control system |
JPH11249732A (en) * | 1998-03-05 | 1999-09-17 | Suzuki Motor Corp | Communication method and device for controller |
DE19852351A1 (en) * | 1998-11-13 | 2000-05-18 | Hella Kg Hueck & Co | Diagnostic system for an LED light in a motor vehicle |
US6273034B1 (en) * | 2000-05-17 | 2001-08-14 | Detroit Diesel Corporation | Closed loop fan control using fan motor pressure feedback |
JP4110766B2 (en) | 2001-11-08 | 2008-07-02 | トヨタ自動車株式会社 | Control device for internal combustion engine |
DE10244094A1 (en) * | 2002-09-23 | 2004-04-01 | Robert Bosch Gmbh | Method and device for controlling an internal combustion engine |
JP4281420B2 (en) | 2003-06-03 | 2009-06-17 | トヨタ自動車株式会社 | Semiconductor relay |
JP4415779B2 (en) * | 2004-03-25 | 2010-02-17 | 株式会社デンソー | Drive device for secondary air introduction system |
DE102004024954A1 (en) | 2004-05-21 | 2005-12-08 | Robert Bosch Gmbh | Sensor for a transmission control in particular of a motor vehicle |
DE102005060025A1 (en) | 2005-12-15 | 2007-06-21 | Siemens Ag | Method for transmitting information by means of pulse diagnosis modulating pulse width modulation |
-
2007
- 2007-06-08 DE DE102007026601A patent/DE102007026601B3/en not_active Expired - Fee Related
-
2008
- 2008-04-28 US US12/601,931 patent/US8392060B2/en active Active
- 2008-04-28 EP EP08749777.2A patent/EP2148978B1/en active Active
- 2008-04-28 WO PCT/EP2008/055147 patent/WO2008145469A1/en active Application Filing
- 2008-04-28 JP JP2010509767A patent/JP5361873B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008145469A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2148978B1 (en) | 2015-08-05 |
JP5361873B2 (en) | 2013-12-04 |
DE102007026601B3 (en) | 2008-12-24 |
JP2010528217A (en) | 2010-08-19 |
US20100174441A1 (en) | 2010-07-08 |
WO2008145469A1 (en) | 2008-12-04 |
US8392060B2 (en) | 2013-03-05 |
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