KR20140050656A - Method and device for monitoring a control unit for operating an engine system - Google Patents

Method and device for monitoring a control unit for operating an engine system Download PDF

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Publication number
KR20140050656A
KR20140050656A KR1020147003185A KR20147003185A KR20140050656A KR 20140050656 A KR20140050656 A KR 20140050656A KR 1020147003185 A KR1020147003185 A KR 1020147003185A KR 20147003185 A KR20147003185 A KR 20147003185A KR 20140050656 A KR20140050656 A KR 20140050656A
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South Korea
Prior art keywords
offset
monitoring
variable
drive engine
torque
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KR1020147003185A
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Korean (ko)
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KR101870486B1 (en
Inventor
마르틴 바흐
아힘 하아스
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로베르트 보쉬 게엠베하
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1002—Output torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F02D2200/602—Pedal position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The present invention relates to a method for monitoring the operation of a drive engine (2),
Controlling the drive engine 2 using an adjustment variable S which is calculated depending on the external input FWM according to the control function;
Monitoring the adjustment variable S by comparing the threshold by the adjustment variable threshold M THR ,
In this case, the control variable threshold value M THR has a step of being generated depending on the control variable requirement calculated using the monitoring function and the control variable offset M Offset , wherein the monitoring function represents an independent reproduction of the control function. The adjustment variable offset M Offset is variably selected depending on the operating area of the drive engine 2. The idea of the method is to provide a monitoring function in which a torque threshold with an offset on the torque level is provided, which offset is reduced in the overrun operating area for improved error identification during overrun operation of the internal combustion engine.

Figure pct00001

Description

METHOD AND DEVICE FOR MONITORING A CONTROL UNIT FOR OPERATING AN ENGINE SYSTEM}

The present invention relates to a method for monitoring a drive torque demand for a drive system for a motor vehicle, in particular for a drive engine of a motor vehicle.

In an engine system having an internal combustion engine for driving a motor vehicle, the internal combustion engine is generally controlled by an engine control device in order to provide the required driving torque, ie, the driver's required torque preset by the driver, by the driving engine. In addition to the driver demand torque, the engine control unit also provides torque for other torque demands, such as shifting assistance, idling control and jerking damper functions, to detect the regulating variable torque which is converted to the corresponding drive variable for the converter driving the internal combustion engine. Torque demands, such as the required amount, are also taken into account so that a corresponding torque is provided. For example, in a diesel engine, the regulating variable torque is converted to the amount of fuel to be injected.

In order to prevent unwanted vehicle acceleration, the function of the engine control unit is constantly monitored. To this end, in the engine control apparatus, the current torque provided by the internal combustion engine is compared with the torque threshold detected separately, and the error response is activated when the current torque exceeds the torque threshold.

In order to prevent detection disturbance in error free operation, the offset is taken into account, that is, the torque threshold is set higher by the value determined by the offset than the expected value of the current torque in normal operation. As such, when there is a small error in the provided current torque and / or the required driver demand torque and / or other torque demands, the offset can prevent the recognition error of the malfunction. In particular, during the overrun operation, the preset offset is mainly so large that error recognition by this type of torque monitoring is not possible, so that an error occurring during the overrun operation cannot be recognized. Until now, the error produced during overrun operation is recognized by separate overrun monitoring.

According to the invention there is provided a method for monitoring the drive torque provided by a drive engine according to claim 1 and an apparatus, an engine system and a computer program product according to the dependent claims.

Other preferred embodiments of the invention are presented in the dependent claims.

The idea of the method is to provide a monitoring function in which a torque threshold with an offset on the torque level is provided, which offset can be reduced in the overrun operating area for improved error identification during overrun operation of the internal combustion engine. . This makes it possible to transfer the known behavior of overrun monitoring to torque monitoring during overrun operation.

Disadvantages of recognition error in overrun monitoring are high speed offset and long response time. These shortcomings are transferred to the error recognition area of torque monitoring with less speed offset and less response time. In particular, the method of reducing the offset by an applied value for the detection of the torque threshold during the recognition of the overrun operation, in order to enable more accurate error recognition in the operating area with less rotational speed and less load during the overrun operation. Is provided.

According to a first aspect there is provided a method for monitoring the operation of a drive engine. The method comprises:

 Controlling the drive engine using an adjustment variable calculated depending on an external input according to a control function;

Monitoring the adjustment variable by comparing the threshold by the adjustment variable threshold, wherein the adjustment variable threshold includes the step of being generated depending on the adjustment variable requirement calculated using the monitoring function and the adjustment variable offset. The monitoring function represents an independent reproduction of the control function, and the adjustment parameter offset is variably selected depending on the operating area of the drive engine.

The adjustment variable may also correspond to the adjustment torque, the adjustment variable threshold to the torque threshold, and the adjustment variable offset to correspond to the torque offset.

According to another embodiment, the adjustment variable offset can be calculated by adding the correction variable to the relative offset value calculated from the offset function, where the correction variable is the first when the drive engine is located within a preset operating area. Take a preset correction value.

In particular, the preset operating area may correspond to the overrun operating area provided, in particular, when the external input presets that the drive engine should not provide drive torque.

It may be provided that the first correction value is a confirmed value or a value dependent on the operating point.

The correction variable may also take a second preset correction value when the drive engine is located outside the preset operating area.

The second correction value may correspond to a set value, and in particular may be zero.

According to another aspect there is provided an apparatus for monitoring the operation of a drive engine, the apparatus comprising:

-The driving engine is controlled by using the control variable calculated depending on the external input according to the control function,

-The control variable is monitored by comparing the threshold by the control variable threshold, wherein the control variable threshold is generated depending on the control variable demand and the control variable offset calculated using the monitoring function, and the monitoring function is independent of the control function. I show a phosphorus reproduction,

It is configured to variably set the adjustment variable offset depending on the operating area of the drive engine.

According to another aspect, an engine system having a drive engine and the device is provided.

According to another aspect, there is provided a computer program product comprising program code for executing the method when executed in an information processing apparatus.

Preferred embodiments of the invention are explained in more detail by the accompanying drawings as follows.

1 is a block diagram of an engine system.
2 is a functional diagram for calculating a torque threshold for limiting the preset torque set by the control unit.

1 shows an engine system 1 with a drive engine 2 which can be driven by one or a plurality of adjustment variables to provide a preset drive torque. For example, the adjustment variable S can be detected from the required adjustment torque or from the information of the drive torque to be provided. For example, the drive torque 2 can represent an internal combustion engine. In the case of a diesel engine, the adjustment variable S may indicate the amount of fuel to be injected. In the case of a gasoline engine, the adjustment variable S may indicate the position of the throttle valve for controlling the supply of air to the cylinder of the internal combustion engine.

The adjustment variable S can be calculated from the information on the drive torque to be provided in the engine control unit 3, in particular in the adjustment variable block 31. The drive torque to be provided is controlled by the engine control unit 3 from, for example, a preset driver demand torque FWM derived from the position of the accelerator pedal and from other external variables such as the torque demand of additional components such as air conditioners and transmissions. In block 32 it is calculated according to a conventional control function. The detection of the drive torque M B to be provided according to the control function is made in the control block 32 in a known manner, and here the function for the detection of the block is not described in more detail.

In addition, the information on the driving torque M B to be provided is monitored using the torque threshold M THR which is separately detected according to the monitoring function, whereby the monitoring block 33 for monitoring the function according to the provisions of the control block 32 is required. ) Is provided. The monitoring block 33 may be formed together or separately with the control block 32 or the same microcontroller in the common control device.

The monitoring block 33 produces a torque threshold M THR as an adjustment variable threshold depending on the operating point of the drive torque 2. Torque threshold (M thr) the drive torque to be provided is monitored using, when the drive torque to be provided exceeds the torque threshold value (thr M), an error is recognized on. In this case, an error response is initiated which can cause signaling of the error and / or start of emergency operation or shutdown of the drive engine 2.

If an error is recognized, the monitoring unit 33 optionally stops the control of the drive torque 2 using the adjustment variable S or adjusts it according to the error function without considering the drive torque M B to be provided. In order to calculate the variable S, the adjustment variable block 31 is controlled in a corresponding manner. The monitoring unit 33 as an error function, for example, limits the rotation of 1500 Upm by the corresponding control of the adjustment variable block 31 when an error is recognized by the control block 32 when the adjustment variable S is generated. Can execute the rotational speed limit.

In FIG. 2 a functional diagram is shown for illustrating the function for the calculation of the torque threshold M thr in the monitoring block 33. In the torque image block 21, the required torques and other additional torques ZM 1 , ZM 2 , ZM 3 , for example the driver required torque FWM, which can be derived from the accelerator pedal position, are the torque threshold M. thr ) is converted to the total torque demand M A that can be generated.

Torque demand (M A) is a torque threshold value for detecting a total of (M thr), is supplied to the torque demand (M A), the addition element 22 is added to the variable torque offset (offset M) on.

The torque threshold M thr is supplied to the selection block 23. The selection block 23 checks the current torque demand M B of the control block 32 in relation to the torque threshold M thr or recognizes the activated overrun operation indicated by the overrun activation signal SAS. In this case, a torque threshold of zero (M thr = 0). When the torque demand calculated by the torque image block 21 is zero in the activated overrun operation, and it is ensured that the variable torque offset M offset as an adjustment variable offset takes likewise in the overrun operation, the selection block 23 ) May be omitted.

If all conditions for valid overrun operation are provided, the overrun activation signal SAS is activated, that is to say switches this selection member 23 such that a torque threshold M thr of zero is output. Conditions for activated overrun operation are that the accelerator pedal is not actuated (in other words, no drive torque is required by the external input to the drive engine), idling control is active and / or no external torque requirement is present. It may not be. Other conditions for the activated overrun activation signal SAS may be provided.

As long as the overrun activation signal SAS is in an inactive state, the torque threshold M thr is calculated as the sum of the torque demand amount M A and the torque offset M Offset .

The torque offset M Offset is calculated from the operating point information of the drive engine 2 using the offset characteristic map 24. The operating point information can be determined as the load L in the form of the instantaneously provided drive torque and as the information about the rotation speed n. Other operating variables for determining the operating point are also possible.

The offset characteristic map 24 first provides the relative torque offset value rM Offset supplied to the subtraction element 25 at its output. In the subtraction element 25, in order to reduce the relative torque offset value rM Offset and to provide a corrected relative torque offset value rM Offset_korr , the offset correction value rk orr is a relative torque offset value rM Offset . Subtracted from

In the switching block 26, the relative variable of the corrected relative torque offset value rM Offset_Korr is converted into the torque offset M Offset by a square with the maximum torque that can be provided by the internal combustion engine, which is provided in advance, and adder element. It is supplied to 22.

The first correction value r Korr or the second correction value is applied to the subtraction element 25 as a relative correction factor, depending on the overrun operation sine SS indicating whether or not the drive engine is operated within the overrun operating region. do. The overrun enable signal SS, unlike the overrun enable signal SAS, indicates information that overrun actuation may be provided. Therefore, the overrun operation signal SS is already activated early before the start of the overrun operation, because the number of criteria for confirming the overrun operation is reduced compared to the number of criteria necessary for activating the overrun activation signal SAS. . In particular, when no drive torque is required by the external input (driver torque request), it can be confirmed that the drive engine is located in the overrun operating region.

Then, for example, if the accelerator pedal position is zero and this position is optionally maintained for a specific debounce time, the overrun activation signal SAS is activated to apply the relative correction value r Korr to the subtraction element 25. Induce. Other conditions such as, for example, intervention of an idle controller or the like are not monitored here. Thereby, before the activated overrun operation is indicated by the overrun activation signal (SAS), recognized by the engine control unit 3, the relative torque offset value relative correction to reduce the (rM Offset) value (r Korr) It is possible to activate it.

The relative correction value r Korr may be a fixed preset value that is reduced by subtracting the relative torque offset value rM Offset . Alternatively, the relative correction value r Korr may be a fixed preset coefficient. Alternatively, the relative correction value r Korr may be calculated through the correction value characteristic map (not shown), for example, depending on the operating point (load, rotational speed, etc.) of the drive engine 2.

Claims (10)

Method for monitoring the operation of the drive engine 2, the method is
Controlling the drive engine 2 using an adjustment variable S which is calculated depending on the external input FWM according to the control function;
-Monitoring the adjustment variable (S) by comparing the threshold value by the control variable threshold value (M THR ), wherein the control variable threshold value (M THR ) is the control variable requirement and control variable offset calculated using the monitoring function. A method for monitoring the operation of a drive engine, wherein the step of generating is dependent upon M Offset , wherein the monitoring function represents an independent reproduction of the control function.
The adjustment variable offset M Offset is variably selected depending on the operating area of the drive engine 2, the method for monitoring the operation of the drive engine. 2. The operation of the drive engine according to claim 1, wherein the adjustment variable S corresponds to the adjustment torque, the adjustment variable threshold value M THR to the torque threshold value and the adjustment variable offset M Offset corresponds to the torque offset. Method for monitoring. The adjustment variable offset M Offset is calculated by adding the correction variable r korr to the relative offset value rM Offset calculated from the offset function, wherein the drive engine 2 is calculated. And when located within this preset operating area, the correction variable r korr takes a first preset correction value. 4. The monitoring of the drive engine according to claim 3, wherein the preset operating area corresponds to an overrun operating area provided, in particular, when the external input presets that the drive engine 2 should not provide a drive torque. Way. The method according to claim 3 or 4, wherein the first correction value is a set value or a value dependent on the operating point. The drive engine according to any one of claims 3 to 5, wherein the correction variable r korr takes a second preset correction value when the drive engine 2 is located outside the preset operating area. Method for monitoring the operation of the machine. The method according to claim 6, wherein the second correction value corresponds to a setting value, in particular zero. Apparatus for monitoring the operation of the drive engine 2, the apparatus,
-Control the drive engine 2 using the adjustment variable (S) calculated depending on the external input (FWM) according to the control function,
The control variable (S) is monitored by comparing the threshold by the control variable threshold, where the control variable threshold (M THR ) depends on the control variable demand and the control variable offset (M Offset ) calculated using the monitoring function. Generated, the monitoring function represents an independent reproduction of the control function,
A device for monitoring the operation of the drive engine, which is configured to variably set the adjustment variable offset M Offset depending on the operating area of the drive engine 2. An engine system (1) with a drive engine (2) and a device according to claim 8. A computer program product comprising program code for executing the method according to claims 1 to 7, when the program code is executed in an information processing apparatus.
KR1020147003185A 2011-08-11 2012-06-26 Method and device for monitoring a control unit for operating an engine system KR101870486B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE201110080859 DE102011080859A1 (en) 2011-08-11 2011-08-11 Method and device for monitoring a control device for operating an engine system
DE102011080859.0 2011-08-11
PCT/EP2012/062350 WO2013020752A1 (en) 2011-08-11 2012-06-26 Method and device for monitoring a control unit for operating an engine system

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KR20140050656A true KR20140050656A (en) 2014-04-29
KR101870486B1 KR101870486B1 (en) 2018-07-19

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CN (1) CN103732889A (en)
DE (1) DE102011080859A1 (en)
WO (1) WO2013020752A1 (en)

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JP6525106B2 (en) * 2016-05-27 2019-06-05 日産自動車株式会社 Method and apparatus for diagnosing abnormality in driving force control system
DE102016222652A1 (en) * 2016-11-17 2018-05-17 Robert Bosch Gmbh Method and device for monitoring a deviation of a first rotational speed of a first drive unit for an aircraft from a second rotational speed of an at least second drive unit for an aircraft
DE102017208697A1 (en) * 2017-05-23 2018-11-29 Robert Bosch Gmbh Method for operating and method for monitoring a drive unit

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DE102005062868A1 (en) * 2005-12-29 2007-07-05 Robert Bosch Gmbh Drive system`s e.g. hybrid drive, instantaneous distribution monitoring method, involves generating resultant torque after torque distribution, where resultant torque is continuously compared with torque before torque distribution
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JP2006522264A (en) * 2003-04-04 2006-09-28 ローベルト　ボツシユ　ゲゼルシヤフト　ミツト　ベシユレンクテル　ハフツング Internal combustion engine drive method for torque monitoring

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CN103732889A (en) 2014-04-16
KR101870486B1 (en) 2018-07-19
DE102011080859A1 (en) 2013-02-14
WO2013020752A1 (en) 2013-02-14

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