EP1313936A1 - Verfahren und vorrichtung zur steuerung einer brennkraftmaschine - Google Patents
Verfahren und vorrichtung zur steuerung einer brennkraftmaschineInfo
- Publication number
- EP1313936A1 EP1313936A1 EP01956406A EP01956406A EP1313936A1 EP 1313936 A1 EP1313936 A1 EP 1313936A1 EP 01956406 A EP01956406 A EP 01956406A EP 01956406 A EP01956406 A EP 01956406A EP 1313936 A1 EP1313936 A1 EP 1313936A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control unit
- peripheral control
- signals
- request
- request signal
- 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
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
- F02D41/24—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
- F02D41/22—Safety or indicating devices for abnormal conditions
Definitions
- the invention relates to a method and a device for controlling an internal combustion engine.
- the central control unit transmits request signals to the peripheral control unit. Based on these request signals, the peripheral control unit applies control signals to consumers.
- the consumers are in particular injectors that control the metering of fuel into the internal combustion engine.
- the peripheral control unit checks the request signals and / or further signals for plausibility. This can significantly increase the safety of the control. It is also advantageous that the central control unit only provides simply designed request signals that only define the start and the end of the injection. The peripheral control unit then converts them into certain current and voltage profiles that are used to control the injectors. are required. Furthermore, the peripheral control unit can monitor the injectors and the output stages. Furthermore, an individual adaptation to the injectors is possible by using a peripheral control unit. On the other hand, the central control unit can be used globally for different injectors. This results in considerable cost savings, since the central control unit can be manufactured in large numbers, since the adaptation to the different injectors takes place in the peripheral control unit.
- DE 198 21 561 discloses a method for a device for monitoring electromagnetic consumers. There, the voltage and / or the current that flows through a booster capacitor or is present at the booster capacitor is monitored for plausibility.
- a method and a device for controlling at least one consumption is known from DE 195 39 071. There, the consumers are divided into at least two groups. The cost-intensive and complex components are only intended for one group.
- FIG. 2 shows a block diagram of the peripheral control unit
- FIG. 3 shows various signals applied in block time
- FIG. 4 shows a flow diagram to illustrate the procedure according to the invention. Description of the embodiments
- the invention is preferably applied to an internal combustion engine, in particular a self-igniting internal combustion engine.
- the fuel metering is controlled by means of injectors which are actuated by means of electromagnetic valves or by means of piezo actuators. These injectors or these valves or actuators are referred to below as consumers.
- a central control unit receives signals from various sensors. This is, on the one hand, a first sensor 110, which provides a signal FP regarding the driver's request, a second sensor 120, which supplies signal NW regarding the camshaft revolution, and a third sensor 130, which supplies a signal KW regarding the crankshaft position.
- sensors 120 and / or 130 in particular sensors are used which scan increment or segment wheels. These sensors deliver pulses with a fixed angular distance.
- the central control unit acts on a peripheral control unit 150 with different request signals AI to A8.
- the number of request signals preferably corresponds to the number of consumers to be controlled.
- the central control unit 100 forwards the signal KW with respect to the crankshaft position to the peripheral control unit 150.
- the request signals AI to A8 are preferably each transmitted via a line.
- the central control unit 100, the peripheral control unit 150 and further units, not shown, are connected via a communication system, which is in particular designed as a CAN bus.
- the peripheral control unit 150 is in turn connected to the consumers 161 to 168 by means of lines.
- the control signals S1 to S8 are applied to each of these.
- the exemplary embodiment shown is an • internal combustion engine with eight cylinders. However, the procedure according to the invention can also be used with internal combustion engines with a different number of cylinders.
- the peripheral control unit 150 is connected to a supply voltage Ubat via a switching means 170 which can be controlled by the central control unit 100.
- the central control unit 100 determines request signals AI to A8 on the basis of various variables which characterize the operating state, the ambient conditions and / or the driver's request. These request signals determine the beginning, the end and thus the duration of the fuel metering. In the case of appropriately trained consumers, this signal can be used directly to control a switching means for energizing a consumer, in particular a solenoid valve. The problem now is when consumers are used which require a specific current profile and / or a specific voltage profile to be controlled exactly.
- Fast-switching solenoid valves are often used, which are initially subjected to an increased voltage, which is also referred to as booster voltage.
- the current is reduced to a holding current.
- This current profile is preferably " by means of special
- Power amplifier components or power amplifier circuits implemented. If these power amplifier components are integrated in the central control unit, a different central control unit must be manufactured for each injector type. If, on the other hand, the final stage is structurally separate from the injectors, then so errors can occur during data transmission between the central control unit and the output stage.
- a peripheral control unit 150 which converts the general request signals into special control signals and at the same time carries out a diagnosis, in particular of the request signals.
- the diagnostic result is preferably reported back to the central control unit 100 via the CAN bus. It is particularly advantageous that, in the event of an appropriately identified error, the
- Central control unit by actuating the switching means 170 can put the peripheral control unit and thus also the consumer out of operation.
- peripheral control unit effects a phase shift of 90 °. This means that the control signals for a specific cylinder are only triggered when the plausibility check has been completed, that is to say the request signal is completely present. This makes it possible to prevent activation of the corresponding consumer and / or all consumers in the event of an error.
- the peripheral control unit 150 essentially includes a first monitor 210, to which the KW signal is fed, a second monitor 220, to which the request signals AI to A8 are fed, a control calculation 230 and an output stage 240, which the control Provides signals Sl to S8.
- the final stage is structurally separate from the peripheral control unit 150.
- the control calculation 230 is acted upon by signals from the first monitoring and the second monitoring and delivers a signal to the output stage 240.
- the output stage 240 reports a signal to the second monitoring 220.
- the first and the second monitoring exchange signals.
- the second monitor 220 applies a signal to the CAN bus.
- FIG. 3a Various signals are plotted over time in FIG.
- FIG. 3a different angular ranges of the crankshaft are identified for a first group of consumers and, in FIG. 3b, request signals which are permissible as examples.
- FIG. 3c different angular ranges of the crankshaft are identified for a second group of consumers and, in FIG. 3d, exemplary request signals are indicated.
- FIG. 3e shows a partial area of FIG. 3a and a partial area of FIG. 3b in FIG. 3d.
- angular areas are marked with vertical lines for a first group of consumers.
- the corresponding request signals are shown in sub-figure 3B.
- the angular range between the point tl and the point t3 characterizes the angular range in which a request signal AI is permissible for a first consumer.
- the angular range between the point t3 and the point t5 characterizes the angular range in which a request signal A3 is permissible for a second consumer.
- the angular range between point t5 and point t7 characterizes the angular range in which a request signal A5 is permissible for a third consumer.
- the angular range between point t7 and the point tl denotes the angular range in which a request signal A7 is permissible for a fourth consumer.
- the distance between two points defines an angular range of 180 ° crankshaft angle in the example shown. The situation is with one
- FIGS. 3c and 3d the angular ranges and the request signals of a second group of consumers are shown in FIGS. 3c and 3d. Consecutive consumers in the firing order are assigned to different groups of consumers.
- FIG. 3 shows a special embodiment for an internal combustion engine with 8 cylinders.
- the consumers are divided into two groups, the angular ranges of two cylinders of the same group directly adjoining one another. Angular areas of two cylinders of different groups can overlap.
- the angular ranges can also be selected such that a gap remains between the angular ranges of two cylinders of the same group. This means that there is an angular range in which request signals are not permitted.
- the angle ranges can be specified as required.
- an angular range is specified for each request signal. If the request signal occurs in this angular range, it is recognized as plausible.
- the angular ranges of the individual request signals can overlap, be at a distance and touch.
- the conditions in an internal combustion engine with 8 cylinders are shown in FIGS. 3a to 3d. In an internal combustion engine with a smaller number of cylinders, the angular ranges are correspondingly smaller.
- the first monitoring 210 carries out a plausibility check of the request signals AI to A8 with the crankshaft signal KW. Errors are detected when the request signal lies outside the specific angular ranges of the crankshaft. As shown in FIG. 3, the permissible angular range for the first request signal is defined by the times t1 and t3. According to the invention, it is checked whether the request signal begins and / or ends in a corresponding angular range.
- a camshaft signal can also be processed instead of the crankshaft signal.
- a proper request signal is only recognized if the duration of the fuel injection has a certain length, i. H. Distance between the times tl3 and tl4 is greater than a first threshold or it is smaller than a second threshold. If the signal is shorter than the threshold value, the request signal is too short or an interference pulse can be assumed. If the request signal is too long, a continuous injection can be assumed. Corresponding errors are recognized by the second monitoring 220.
- the central control unit If the first or the second monitoring detects a corresponding error, this is transmitted to the central control unit via the CAN bus. This then takes appropriate measures, in particular emergency operation is initiated or the peripheral control unit is switched off and the output stages are thus deactivated.
- the control calculation 230 calculates the required current profile and / or voltage profile in order to suitably control the consumers.
- Signal arrives at output stage 240.
- a device such as is known from the prior art can be used as the output stage.
- An output stage with at least one high-side switch and at least one low-side switch is preferably used.
- a common high-side switch is preferably used for all consumers or a group of consumers.
- a corresponding current / voltage profile on the consumer is then achieved by correspondingly controlling the high and low side switches.
- a duty cycle i.e. one engine revolution, consists of two crankshaft revolutions. This means that the peripheral control unit cannot immediately see which of the two crankshaft revolutions it is in. This means that the peripheral control unit does not clearly recognize, for example, whether the angular range between t1 and t3 or the angular range between t5 and t7 is present. This requires synchronization.
- the synchronization procedure is as follows. In a first step, it is checked whether there is a permissible request signal. All checks are preferably carried out. If it is recognized that the request signal is within the permissible angular range, the synchronization has taken place. If it is recognized that the request signal is not in the permissible angular range, it is checked whether the request signal is plausible in the angular range which is phase-shifted by 360 °. If this is the case, a resynchronization takes place. If the request signal is also inadmissible in this angular range, an error is recognized.
- the output stage also carries out error monitoring. It can be provided that the currents flowing through the consumer and / or the voltage values dropping at the consumer or at components of the output stage are monitored. In particular, it is known from the prior art to monitor the voltage on a so-called booster capacitor. This booster capacitor provides the increased voltage required during the switch-on process, which is generally greater than the supply voltage. If the end stage detects a corresponding error, this is also reported to the second monitoring unit and from there passed on to the central control unit via the CAN bus. The procedure for monitoring and checking the plausibility of the signals is shown in FIG. 4 using a flow chart.
- a first query 400 checks whether two request signals AI to A8 occur simultaneously. In particular, it is checked whether the beginning and / or the end of two request signals occur simultaneously or almost simultaneously.
- a query 410 checks whether there is a special operating state.
- these special operating states it can happen that two cylinders are measured at the same time. This is the case, for example, in the case of an internal combustion engine with 8 cylinders if a post-injection for exhaust gas aftertreatment takes place.
- step 420 an error is recognized and a corresponding signal is emitted via the CAN bus. If two request signals AI to A8 occur simultaneously, a short circuit between two lines between the central control unit and the peripheral control unit can be assumed.
- step 410 can be omitted.
- query 400 detects simultaneous injections, the process moves immediately to step 420 and detects errors.
- query 430 checks whether the request signals occur in an allowed angular range. That means it is checked whether the request signals of a specific cylinder are present in the corresponding angular range. For example, the request signal for the first cylinder must occur between the points tl and ⁇ t3.
- step 420 If one of the conditions is not met, that is to say.
- the request signal occurs outside a specific angular range of the crankshaft or the camshaft and / or outside a specific period of time, the program ends in step 420. If all conditions are met, query 440 follows.
- Inquiry 440 checks whether the duration of the request signal is too long or too short. If so, i. H. If the request signal is too long or too short, the program ends with step 420. If the duration of the request signal meets the required condition, step 450 follows. This query checks whether the duration of the injection is plausible. The request signal is usually significantly shorter than a segment.
- query 450 it is checked whether the distance between two request signals meets certain criteria. In particular, the distance between two request signals must be greater than a threshold value. If this is not the case, the program also ends with step 420. If this is the case
- step 460 follows.
- the distance between two partial injections is preferably checked for plausibility. This means it is checked whether the distance between points tl2 and tl3 assumes a permissible value.
- the number of partial injections is counted. For monitoring purposes, this determined number of partial injections is compared with the number of partial injections transmitted by the central control unit. To do this, it is necessary for the central control unit or the peripheral control unit to transmit the corresponding number via the CAN bus.
- step 460 it is checked whether the current and / or voltage values measured and / or detected by the output stage assume plausible values. If this is not the case, the program also ends with step 420. If this is the case, then in step 470 an error-free operation is recognized. Alternatively, it can also be provided that the output stage 240 carries out an error monitoring and transmits a signal to the monitoring if a corresponding error is present. With this configuration, the
- Query 460 only whether there is a corresponding error signal from the output stage 240.
- the various checks are carried out one after the other in time.
- the order of the checks can also be chosen differently. It is particularly advantageous if the queries are processed in parallel.
- An embodiment is particularly advantageous in which the check for the permissible angular range, that is to say the
- Query 430 is the last query. If query 430 recognizes that the request signal is not in the permissible angular range, it is checked whether the request signal is plausible in the angular range which is phase-shifted by 360 °. If this is the case, a resynchronization takes place. is if the request signal is also inadmissible in this angular range, an error is recognized.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10041448A DE10041448A1 (de) | 2000-08-23 | 2000-08-23 | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
DE10041448 | 2000-08-23 | ||
PCT/DE2001/002867 WO2002016746A1 (de) | 2000-08-23 | 2001-07-28 | Verfahren und vorrichtung zur steuerung einer brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1313936A1 true EP1313936A1 (de) | 2003-05-28 |
EP1313936B1 EP1313936B1 (de) | 2009-10-07 |
Family
ID=7653555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01956406A Expired - Lifetime EP1313936B1 (de) | 2000-08-23 | 2001-07-28 | Verfahren und vorrichtung zur steuerung einer brennkraftmaschine |
Country Status (7)
Country | Link |
---|---|
US (1) | US6865473B2 (de) |
EP (1) | EP1313936B1 (de) |
JP (1) | JP4621412B2 (de) |
CA (1) | CA2419184C (de) |
DE (2) | DE10041448A1 (de) |
MX (1) | MXPA03001579A (de) |
WO (1) | WO2002016746A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7310574B2 (en) | 2002-11-28 | 2007-12-18 | Stmicroelectronics S.R.L. | Electronic architecture of an automatic system for driving an internal combustion engine |
EP1424478A1 (de) * | 2002-11-28 | 2004-06-02 | STMicroelectronics S.r.l. | Hardware-Architektur eines automatischen Systems zur Ansteuerung eines Injektors einer Brennkraftmaschine |
DE102004002456B4 (de) * | 2004-01-16 | 2008-05-15 | Siemens Ag | Verfahren und Vorrichtung zur Motorsteuerung in einer Verbrennungskraftmaschine sowie Sensorelement |
JP2005315107A (ja) * | 2004-04-27 | 2005-11-10 | Toyota Motor Corp | 8気筒エンジン |
DE102007005361B3 (de) | 2007-02-02 | 2008-10-09 | Continental Automotive Gmbh | Vorrichtung und Verfahren zur Steuerung der Kraftstoffeinspritzung |
DE102008006530B4 (de) | 2008-01-29 | 2017-10-12 | Continental Automotive Gmbh | Steuerungssystem und Arbeitsverfahren für ein Steuerungssystem |
DE102009007792B4 (de) * | 2009-02-06 | 2016-03-03 | Continental Automotive Gmbh | Verfahren und Vorrichtung zum Betreiben einer Brennkraftmaschine |
DE102009029642A1 (de) * | 2009-09-21 | 2011-03-24 | Robert Bosch Gmbh | Verfahren zur Bearbeitung von Informationen und Aktivitäten in einem steuer- und/oder regelungstechnischen System |
US8161946B2 (en) * | 2009-11-20 | 2012-04-24 | Ford Global Technologies, Llc | Fuel injector interface and diagnostics |
DE102015005747B4 (de) * | 2015-05-05 | 2017-05-11 | Liebherr-Elektronik Gmbh | Injektorzustandsüberwachung |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4867115A (en) * | 1986-10-29 | 1989-09-19 | Wayne State University | Cranking fuel control method and apparatus for combustion engines |
DE4108639A1 (de) * | 1991-03-16 | 1992-09-17 | Bosch Gmbh Robert | System zur steuerung einer brennkraftmaschine |
DE4117393A1 (de) * | 1991-05-28 | 1992-12-03 | Kloeckner Humboldt Deutz Ag | Einrichtung zur steuerung der kraftstoffeinspritzung einer brennkraftmaschine |
DE4415640C2 (de) * | 1994-05-04 | 2003-05-15 | Bosch Gmbh Robert | Verfahren und Vorrichtung zum Steuern einer Brennkraftmaschine |
DE19539071A1 (de) | 1995-03-02 | 1996-09-05 | Bosch Gmbh Robert | Vorrichtung zur Ansteuerung wenigstens eines elektromagnetischen Verbrauchers |
JPH09154181A (ja) * | 1995-11-30 | 1997-06-10 | Mitsubishi Electric Corp | 自動車総合制御装置 |
DE19821561A1 (de) | 1998-05-14 | 1999-11-18 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Ansteuerung eines elektromagnetischen Verbrauchers |
JP2002089324A (ja) * | 2000-09-18 | 2002-03-27 | Mitsubishi Electric Corp | 筒内噴射エンジンの燃料噴射制御装置 |
-
2000
- 2000-08-23 DE DE10041448A patent/DE10041448A1/de not_active Withdrawn
-
2001
- 2001-07-28 EP EP01956406A patent/EP1313936B1/de not_active Expired - Lifetime
- 2001-07-28 CA CA002419184A patent/CA2419184C/en not_active Expired - Fee Related
- 2001-07-28 US US10/362,718 patent/US6865473B2/en not_active Expired - Fee Related
- 2001-07-28 DE DE50115162T patent/DE50115162D1/de not_active Expired - Lifetime
- 2001-07-28 JP JP2002522409A patent/JP4621412B2/ja not_active Expired - Fee Related
- 2001-07-28 WO PCT/DE2001/002867 patent/WO2002016746A1/de active Application Filing
- 2001-07-28 MX MXPA03001579A patent/MXPA03001579A/es active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0216746A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20040030488A1 (en) | 2004-02-12 |
WO2002016746A1 (de) | 2002-02-28 |
CA2419184C (en) | 2007-05-01 |
DE10041448A1 (de) | 2002-03-07 |
JP2004507643A (ja) | 2004-03-11 |
CA2419184A1 (en) | 2002-02-28 |
MXPA03001579A (es) | 2004-01-29 |
JP4621412B2 (ja) | 2011-01-26 |
EP1313936B1 (de) | 2009-10-07 |
DE50115162D1 (de) | 2009-11-19 |
US6865473B2 (en) | 2005-03-08 |
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