EP0306906A2 - Appareil de régulation du rapport air-carburant d'un moteur thermique - Google Patents

Appareil de régulation du rapport air-carburant d'un moteur thermique Download PDF

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Publication number
EP0306906A2
EP0306906A2 EP88114559A EP88114559A EP0306906A2 EP 0306906 A2 EP0306906 A2 EP 0306906A2 EP 88114559 A EP88114559 A EP 88114559A EP 88114559 A EP88114559 A EP 88114559A EP 0306906 A2 EP0306906 A2 EP 0306906A2
Authority
EP
European Patent Office
Prior art keywords
speed
power
counter
comparator
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.)
Withdrawn
Application number
EP88114559A
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German (de)
English (en)
Other versions
EP0306906A3 (fr
Inventor
Johann Margreiter
Bernhard Hofer
Günther Dipl.-Ing. Rabanser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Innio Jenbacher GmbH and Co OG
Original Assignee
Jenbacher Werke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jenbacher Werke AG filed Critical Jenbacher Werke AG
Publication of EP0306906A2 publication Critical patent/EP0306906A2/fr
Publication of EP0306906A3 publication Critical patent/EP0306906A3/fr
Withdrawn legal-status Critical Current

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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
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • 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
    • F02D2200/1015—Engines misfires

Definitions

  • the invention relates to a device for regulating the combustion-air ratio of an internal combustion engine operated in lean operation as a function of speed fluctuations or power fluctuations thereof, with a speed or power detection device which has an analog, electrical speed or power corresponding to the speed or power of the engine.
  • Power signal delivers, with a speed or power evaluation device connected downstream of the speed or power detection device and containing at least one filter, a differentiator and a comparator, at the output of which an output signal linked to the derivation of the speed or power signal is available, and with a comparison device , which compares this output signal with a preferably adjustable target value and controls the combustion / air ratio via an actuating device as a function of the comparison result.
  • Such a device is known from US Pat. No. 3,789,816.
  • the purpose of the device described there is to operate a motor intended for vehicles as lean as possible, but without exceeding a certain predetermined uneven running.
  • the speed signal is filtered in a speed evaluation device, differentiated and then rectified in full wave.
  • the level of the output signal of the speed evaluation device represents a measure of the overall uneven running of the engine that can be perceived by the driver of the vehicle, for example, and is compared in a comparator with an adjustable target value.
  • the comparison result signal controls an actuating device via an integrator, which changes the combustion-air ratio accordingly and thus ultimately regulates the overall smooth running of the engine.
  • the invention is based on a completely different object, namely to create a device of the type mentioned at the outset, which ultimately enables pollutant control by regulating the combustion-air ratio.
  • the invention is based on the knowledge that pollutants in the exhaust gases, in particular NO x , decrease with increasing combustion-air ratio in engines operated in lean operation near the so-called misfiring limit, while at the same time the number of mostly aperiodic, rapid speed or power fluctuations and the uneven running increases accordingly.
  • the speed or power evaluation device has a high-pass filter arranged in front of the differentiating element and in that the output of the comparator connected downstream of the differentiating element is connected to a counter, the comparator providing the filtered and differentiated speed or power signal with a threshold value compares and changes the counter reading of the counter within a measuring period specified by a timer, the output signal of the speed or power evaluation device corresponding to the counter reading preferably present at the end of each measuring period.
  • the high-pass filter provided on the input side in the speed evaluation circuit serves, on the one hand, to eliminate the DC voltage component of the speed signal and, on the other hand, to ensure that a change in the speed from the outside, which is always relatively slow in relation to the duration of the typical speed drops, is not assessed as a speed fluctuation relevant for the pollution control.
  • the small periodic fluctuations in speed which always occur due to the sequence of the different cycles of the individual cylinders, do not occur in the device according to the invention.
  • speed fluctuations the derivation (slope) of which exceeds a predetermined threshold value (and only such speed fluctuations) lead to a change in the counter reading and are counted over an adjustable measuring period.
  • the speed signal is thus analyzed.
  • the counter reading at the end of each period indicates the "current" uneven running. This is compared to a target value. If the current uneven running is above the setpoint, the mixture is made richer (combustion-air ratio ⁇ reduced), which reduces the running rest increased. In the opposite case, the mixture is made lean ( ⁇ increased).
  • certain pollutant components in particular NO x , are kept in a narrow control range below a pollutant limit.
  • a comparison device which continuously compares the counter's zen count with a predetermined value and which, when this value is exceeded or fallen below Actuating device causes an immediate reduction in the combustion-air ratio (enrichment) regardless of the measuring period.
  • a particularly preferred embodiment of the invention provides that a device for determining an average speed value and / or a device for determining a power value is provided, and that the comparator of the speed or power evaluation device has at least one further input via which the threshold value with which the filtered and differentiated speed or power signal is compared in the comparator is changeable depending on the current average speed and / or a power value of the engine.
  • the current average speed essentially corresponds to the speed of the engine without the impressed speed fluctuations.
  • the current average speed can be determined, for example, by providing a low-pass filter which receives the speed or power signal from the speed or power detection device and whose output supplies a signal indicating the current average speed or power.
  • the speed evaluation device includes an electronic memory device for storing one of the has an average speed and / or engine power-dependent, engine-specific characteristic diagram for the threshold value mentioned, according to which characteristic diagram the current threshold value can preferably be determined in a microprocessor-dependent manner as a function of the current average speed and / or current engine power.
  • the characteristic map is determined for a specific engine type in the preliminary test, for example by operating the engine according to a predetermined grid at different outputs and / or speeds and determining the pollutant concentration and the uneven running.
  • the threshold value can be adapted to the current power in that a power signal is fed to a threshold value input of the comparator via a preferably substantially linear amplifier unit.
  • the average speed value can be fed to a threshold input of the comparator via an amplifier (possibly non-linear).
  • FIG. 1 shows a schematic illustration of an example of the use of the control device according to the invention in a stationary gas engine operated in lean operation
  • FIG. 2 shows a block diagram of the exemplary embodiment of the device according to the invention shown in FIG. 1, which carries out a speed analysis.
  • the stationary gas engine 1 shown in FIG. 1 is supplied with a gas-air mixture, which the gas mixer 5 prepares, via an exhaust gas turbocharger 2, a throttle valve 3 and a charge air cooler 4.
  • the gas supply line is designated by 6, the air supply line by 7 and the exhaust gas line by 11.
  • an air bypass line 8 is provided, in which a control valve 10 which is adjustable via a servomotor 9 is arranged.
  • the essential components of an exemplary embodiment of the device according to the invention for regulating pollutants are summarized in the unit designated overall by 12. This unit receives a speed signal n detected by the speed sensor 13 and a pressure signal p, which is used as a rough measure of the engine output, and which is recorded by the pressure meter 14.
  • the smooth running of the engine is controlled via the combustion / air ratio ⁇ ( at a distance from the so-called dropout limit) and thus ultimately regulates the pollutant concentration (in particular NO x concentration).
  • FIG. 2 An exemplary embodiment of the control device according to the invention, which carries out a speed analysis to determine an uneven running dimension, is shown in FIG. 2 in the block diagram.
  • the device shown in FIG. 2 has the following assemblies surrounded by dashed lines: a speed detection device 16 which supplies an analog speed signal on line 17, a device 18 for determining a speed signal correlated with the mean current speed (on line 19), a device 20 for detecting and determining a power signal correlated with the current engine power (on line 21) and the actual speed evaluation circuit 22, which analyzes the speed signal on line 17 (depending on the signals on lines 19 and 21) and as an output signal (on line 23 ) outputs an uneven running value which has already been evaluated as a function of the current average speed and current output and which is compared in the comparison device 24 with a desired value present on line 15.
  • the mixture for the engine 1 is made leaner or richer by means of the servo motor 9, so that the smoothness and ultimately the pollutant concentration are regulated within predetermined limits.
  • the speed sensor 13 continuously detects the speeds of the engine.
  • the frequency of the recording signal is converted in the frequency-voltage converter 34 into the analog speed signal on line 17.
  • this speed signal initially runs on the input side via a high-pass filter 24 provided according to the invention, the cut-off frequency of which is approximately 8 Hz.
  • This as Active filter constructed high-pass filter 24 eliminates the DC voltage component and prevents relatively slow speed changes from the outside from being interpreted as uneven running.
  • the following differentiator 25 differentiates the filtered speed signal. The size of the output signal of the differentiating element 25 thus measures the changes (derivation) of the speed signal.
  • This output signal now arrives at the comparator 26 provided according to the invention, the output 26a of which is connected to a digital counter 27 and which compares the filtered and differentiated speed signal with a threshold value and at lower or lower values. exceed the same changed the counter reading of the counter 27.
  • a timer 28 determines the duration t m of the measuring periods during which the output pulses are counted, which result from fluctuations (drops) in the speed signal and a steepness exceeding a certain value.
  • the counter reading at the end of each measurement period lasting, for example, about 3 seconds forms the output signal (uneven running) of the speed evaluation device 22.
  • This output signal advantageously remains stored in the output memory 27a of the counter 27 until the end of the following measurement period, while the counter itself periodically at the beginning via a reset input 27b every measurement period is set to zero.
  • the threshold value above which a speed fluctuation (more precisely: its slope) is considered relevant, i.e. from which the counter 27 is counted up, can be adjusted depending on the current average speed and the current engine power in order to do this.
  • a speed fluctuation more precisely: its slope
  • the device 18 has a low-pass filter 29 with a cut-off frequency of approximately 1 Hz, the output signal of which is fed via a possibly non-linear amplifier unit 30 to a threshold value input 26b of the comparator 26 is.
  • the mixture pressure p which the pressure gauge 14 receives is used as a rough measure of the engine output.
  • the power signal reaches a further threshold value input 26c of the comparator 26 via two converters 31 and 32 and an essentially linear amplifier unit 33.
  • the comparator 26 can have only one threshold value input, via which it receives the current speed and power-dependent threshold value.
  • This threshold value can be determined, for example, in a microprocessor-based threshold value determination circuit on the basis of a stored engine-specific characteristic map (threshold value versus average speed and power) determined in preliminary tests.
  • the above-mentioned characteristic map can be obtained from an investigation of the relationship between pollutant emissions, which are ultimately supposed to be regulated, and the speed fluctuations at various medium speeds and outputs.
  • the invention is not limited to stationary gas engines.
  • a power signal can also be analyzed, provided that it reproduces the unrest with sufficient accuracy.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP88114559A 1987-09-09 1988-09-07 Appareil de régulation du rapport air-carburant d'un moteur thermique Withdrawn EP0306906A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT227887A AT388029B (de) 1987-09-09 1987-09-09 Einrichtung zur regelung des verbrennungsluftverh|ltnisses einer brennkraftmaschine
AT2278/87 1987-09-09

Publications (2)

Publication Number Publication Date
EP0306906A2 true EP0306906A2 (fr) 1989-03-15
EP0306906A3 EP0306906A3 (fr) 1989-07-26

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Application Number Title Priority Date Filing Date
EP88114559A Withdrawn EP0306906A3 (fr) 1987-09-09 1988-09-07 Appareil de régulation du rapport air-carburant d'un moteur thermique

Country Status (2)

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EP (1) EP0306906A3 (fr)
AT (1) AT388029B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0412010A1 (fr) * 1989-08-02 1991-02-06 Regie Nationale Des Usines Renault Procédé de regulation du ralenti d'un moteur à combustion interne
WO1999008071A1 (fr) * 1997-08-06 1999-02-18 Robert Bosch Gmbh Procede et dispositif pour la correction de tolerances d'une roue indicatrice

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012215434B4 (de) * 2012-08-30 2023-02-16 Bayerische Motoren Werke Aktiengesellschaft Ableiten eines eine feste Quantisierung aufweisenden Digitalsignals

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2005443A (en) * 1977-09-26 1979-04-19 Bendix Corp Acceleration enrichment for closed loop control systems
US4509484A (en) * 1983-05-16 1985-04-09 General Motors Corporation Closed loop lean air/fuel ratio controller
US4519366A (en) * 1982-03-24 1985-05-28 May Michael G Method and apparatus for controlling the composition of the combustion charge in internal combustion engines
US4683856A (en) * 1984-08-28 1987-08-04 Mazda Motor Corporation Engine roughness control means

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872846A (en) * 1972-04-24 1975-03-25 Bendix Corp Exhaust gas recirculation (EGR) internal combustion engine roughness control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2005443A (en) * 1977-09-26 1979-04-19 Bendix Corp Acceleration enrichment for closed loop control systems
US4519366A (en) * 1982-03-24 1985-05-28 May Michael G Method and apparatus for controlling the composition of the combustion charge in internal combustion engines
US4509484A (en) * 1983-05-16 1985-04-09 General Motors Corporation Closed loop lean air/fuel ratio controller
US4683856A (en) * 1984-08-28 1987-08-04 Mazda Motor Corporation Engine roughness control means

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0412010A1 (fr) * 1989-08-02 1991-02-06 Regie Nationale Des Usines Renault Procédé de regulation du ralenti d'un moteur à combustion interne
FR2650633A1 (fr) * 1989-08-02 1991-02-08 Renault Procede de regulation du ralenti d'un moteur a combustion interne
WO1999008071A1 (fr) * 1997-08-06 1999-02-18 Robert Bosch Gmbh Procede et dispositif pour la correction de tolerances d'une roue indicatrice
US6250144B1 (en) 1997-08-06 2001-06-26 Robert Bosch Gmbh Method and device for correcting tolerances in a transmitter wheel

Also Published As

Publication number Publication date
ATA227887A (de) 1988-09-15
EP0306906A3 (fr) 1989-07-26
AT388029B (de) 1989-04-25

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