EP0394216B1 - Verfahren zum Steuern und Regeln einer Brennkraftmaschine - Google Patents

Verfahren zum Steuern und Regeln einer Brennkraftmaschine Download PDF

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Publication number
EP0394216B1
EP0394216B1 EP90890118A EP90890118A EP0394216B1 EP 0394216 B1 EP0394216 B1 EP 0394216B1 EP 90890118 A EP90890118 A EP 90890118A EP 90890118 A EP90890118 A EP 90890118A EP 0394216 B1 EP0394216 B1 EP 0394216B1
Authority
EP
European Patent Office
Prior art keywords
signal
binary
comparator
value
bit
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.)
Expired - Lifetime
Application number
EP90890118A
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German (de)
English (en)
French (fr)
Other versions
EP0394216A2 (de
EP0394216A3 (en
Inventor
Michael Dipl.-Ing. Dr. Heiss
Wolfgang Dittrich
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.)
ROBERT BOSCH AG
Original Assignee
Robert Bosch AG
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Publication date
Application filed by Robert Bosch AG filed Critical Robert Bosch AG
Priority to AT90890118T priority Critical patent/ATE83045T1/de
Publication of EP0394216A2 publication Critical patent/EP0394216A2/de
Publication of EP0394216A3 publication Critical patent/EP0394216A3/de
Application granted granted Critical
Publication of EP0394216B1 publication Critical patent/EP0394216B1/de
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/0007—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using electrical feedback
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/3005—Details not otherwise provided for
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/406—Electrically controlling a diesel injection pump
    • F02D41/407—Electrically controlling a diesel injection pump of the in-line type

Definitions

  • the invention relates to a method for controlling and regulating an internal combustion engine according to the preamble of claim 1 and to an electronic regulating and control device for internal combustion engines according to the preamble of claim 3.
  • a controller delivers a digital output signal.
  • an electromechanical drive for the actuator e.g. the injection pump or pump nozzles.
  • a pulse width modulator with a downstream low-pass filter is then advantageously used as the digital-to-analog converter. It must be taken into account here that, due to its electrical (inductance) and mechanical (mass) properties, the drive exhibits a more or less pronounced low-pass behavior that plays a role in the dimensioning of the low-pass filter.
  • the actuator may in any case be mechanically unsteady, namely an oscillating movement with the clock frequency of the control signal.
  • the effort required for the low-pass filter, particularly at lower clock frequencies, is to be regarded as a disadvantage.
  • pulse-width modulated signals for controlling actuators for the injection quantity is evident, for example, from DE-A-33 11 351, in which case the actuator is controlled directly by the pulse-width-modulated signals.
  • the applicant's DE-A-37 30 443 also shows the use of a pulse-width-modulated signal, but this signal is used here as a command variable for a servo circuit for the actuator.
  • control signal for controlling an electromechanical actuator is thus to be understood in the sense that it includes direct control as well as control of a servo circuit for the actuator.
  • Document JP-A-59 120 776 discloses a speed-dependent control of a fuel pump, which is carried out in such a way that a speed-dependent pulse train is fed to a monostable multivibrator, which forms a speed-dependent pulse from the pulse train, the individual pulses of which have a constant duration.
  • This pulse is fed to a fuel pump. Accordingly, the pulse duty factor increases with increasing speed and, on average, more electrical energy is supplied to the fuel pump.
  • Such a control is unsuitable in the sense of the documents mentioned above.
  • a pulse width modulator for converting a dual digital value into a pulse width modulated signal can, for example from the company publication "Embedded Controller Handbook", Intel, Order Number 21 09 18-005, 1987.
  • the digital value is fed to a register, at whose output the value is, for example, 8 digits (in the dual system).
  • a clock frequency is fed to a counter input, the 8-digit output of which is also compared in a comparator with the previously mentioned value.
  • the output of the comparator which checks for equality, is fed to the reset input of a flip-flop, the set input of which receives the overflow signal from the counter.
  • a pulse width modulated signal is then present at the Q output of the flip-flop. This signal has a pulse within each cycle, the width or length of which increases with increasing size of the value mentioned. With a register value 0 the width of the pulse disappears, with a register value 255 the width almost corresponds to the period T o .
  • the invention has set itself the goal of converting the pulse instead of the usual pulse width modulation To create output signals of the computing device in a control signal for an electromechanical actuator, which has the same effort, in particular with respect to the filtering, significantly lower relative voltage fluctuations of the analog signal.
  • This goal can be achieved with a method according to the characterizing part of claim 1 or with a device according to the characterizing part of claim 3.
  • the invention offers the advantage that, with the same circuit complexity as according to the prior art, a significant reduction in the ripple of the output signal is obtained. With the same demands on the residual ripple, the outlay for a downstream low-pass filter can be kept considerably lower than according to the prior art.
  • downstream low-pass filter here also includes a consumer with a low-pass character, which has already been explained above.
  • FIG. 1 shows an exemplary embodiment of a device according to the invention in a block diagram
  • FIG. 2 shows another exemplary embodiment of a device according to the invention
  • FIGS. 3a and b show the form of the output signal as a function of the preset signal in a device in time diagrams within one cycle according to the prior art (Fig. 3a) or in a device according to the invention (Fig. 3b).
  • Fig. 1 shows schematically a diesel engine 1 with an injection pump 2, the control rod 3 determining the amount of fuel supplied is adjustable by means of an electromechanical drive 4.
  • a computing device 5 calculates from operating variable signals of the engine 1 and also the Vehicle output signal b, which is the basis for the adjustment of the control rod 3.
  • Essential operating variables as input variables of the computing device 5 are the accelerator pedal position, which generates a corresponding signal f via a transmitter 7 and the speed of the engine 1, a speed signal n being supplied by a speed transmitter 8 to the computing device 5.
  • Fig. 1 further sensors 9 are indicated schematically, the additional operating quantity signals, e.g. in terms of engine temperature, air pressure, fuel temperature etc.
  • the output signal b of the computing device 5 and any further output signals b ', b ⁇ is in digital, dual-coded form and is fed to a register 10, from where it has 8 digits as word B to the inputs B0 to B7 of an 8-bit comparator 11 arrives.
  • a comparator can be implemented, for example, with logic modules MM54C85, 4-bit magnitude comparator from National Semiconducter.
  • the company publication "Logic Databook, Volume 1, National Semiconductor Corporation", 1984 shows the logical structure of such modules and describes their interconnection to word lengths that are greater than 4 bits.
  • a dual counter 12 which is supplied with a counting cycle f 1 of the period T 1.
  • This counting clock expediently comes from a clock generator, which is required by the computing device 5 and is not shown in detail.
  • An 8-digit output of the counter 12 is connected to the second input of the comparator 11, but here the counter output is connected to the comparator input in such a way that the output MSB (most significant bit) of the counter 12 corresponds to the Input A0 of the comparator 11 with the lowest position value (LSB) corresponds, ie the order of the positions is reversed when wiring, or, in other words, the counter signal a is fed to the comparator 11 in inverted form.
  • the comparator 11 which checks whether the word A at the inputs A0 to A7 is smaller than the word B at the inputs B0 to B7, a drive signal of the period T0 occurs, which consists of individual pulses within each period, the Total length within each period T0 is proportional to the value of the output signal b of the computing device 5. For a 4-bit comparator, this is illustrated in FIG. 3b, with the previously customary pulse width modulation being compared in FIG. 3a. The default value B is numbered 0 to 15 on the left.
  • the word length is shown with 8 bits, in Fig. 3 with 4 bits. In practice, however, word lengths of 8 to 16 bits or more will be used.
  • the output of the comparator 11 can be followed by a D flip-flop 13 which is clock-edge-controlled by the counter clock f 1 and frees the control signal from switching spikes which arise in the comparator 11.
  • An inverter is upstream of the clock input of the flip-flop 13. The elimination of switching spikes is particularly advisable at higher clock frequencies, when run times in the comparator lead to spikes of a clearly noticeable length, which could cause the predefined signal to be falsified.
  • the control signal s is fed to the electromechanical drive 4 via a simple low-pass filter 14 and an output stage 15.
  • Fig. 2 shows an implementation example of a 4-bit comparator using conventional gate modules and Fig. 3b, as already mentioned, the associated control signal for the sixteen possible default values. From Fig. 3b the person skilled in the art already sees the significant improvement in the ripple of a voltage obtained after filtering. Of course, this improvement is also shown mathematically and experimentally and is given below with the aid of a comparison for the worst case of the pulse duty factor (eg number 8 in FIG. 3a).
  • these voltage fluctuations are at the same filter time constant 4 bits below 12% 10 bits under 0.2% 16 bits under 40.10 ⁇ 6
  • Actuators that are to be controlled based on the output signal b of the computing device 5 are, in particular, the control rod of an injection pump, as shown in FIG. 1. But it can also be actuators for adjusting the injection timing, the amount of air, an exhaust gas recirculation valve, a throttle valve and the like. What is indicated by signals b ', b ⁇ in Fig. 1.
  • a particular advantage associated with the invention can be seen in the rapid and error-free response to a change in the default value, which is not only given by the more favorable filter dimensioning. you alleviate within the period T o the default value B to a particularly smaller value, then a reaction in the desired direction is shown in almost all cases with the structure according to the invention even before the end of the same period. In the case of the prior art, in the worst case, if the default value changes during the period, either so-called outliers (one-time output of 100%) occur, or the desired change does not occur until the next period T o . Such misconduct can have fatal consequences for driving the motor vehicle.
  • the total duration of the control signal s is essentially proportional to the value of the dual or binary output signal b, this should not mean that a direct component (offset) is excluded.

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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)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP90890118A 1989-04-17 1990-04-17 Verfahren zum Steuern und Regeln einer Brennkraftmaschine Expired - Lifetime EP0394216B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90890118T ATE83045T1 (de) 1989-04-17 1990-04-17 Verfahren zum steuern und regeln einer brennkraftmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3912604A DE3912604C1 (enExample) 1989-04-17 1989-04-17
DE3912604 1989-04-17

Publications (3)

Publication Number Publication Date
EP0394216A2 EP0394216A2 (de) 1990-10-24
EP0394216A3 EP0394216A3 (en) 1990-12-05
EP0394216B1 true EP0394216B1 (de) 1992-12-02

Family

ID=6378864

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90890118A Expired - Lifetime EP0394216B1 (de) 1989-04-17 1990-04-17 Verfahren zum Steuern und Regeln einer Brennkraftmaschine

Country Status (4)

Country Link
EP (1) EP0394216B1 (enExample)
AT (1) ATE83045T1 (enExample)
DE (2) DE3912604C1 (enExample)
ES (1) ES2036411T3 (enExample)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109233A1 (de) * 1991-03-21 1992-09-24 Rexroth Mannesmann Gmbh Digitale ansteuerelektronik mit pulsweitenmoduliertem (pwm)-ausgangssignal zum ansteuern elektrischer stellglieder eines hydraulischen systems
DE4310859C2 (de) * 1993-04-02 2002-11-28 Bosch Gmbh Robert Verfahren und Vorrichtung zur Positionierung einer Drosselklappe eines Kraftfahrzeuges
DE10048608C2 (de) * 2000-09-30 2003-04-03 Bosch Gmbh Robert Verfahren und Computerprogramm zum Betreiben einer Brennkraftmaschine sowie Brennkraftmaschine
US10383631B2 (en) 2016-08-04 2019-08-20 Covidien Lp Variable speed control of powered surgical device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2735596C2 (de) * 1977-08-06 1986-09-18 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur elektronischen Einspritzmengenregelung bei Brennkraftmaschinen mit Selbstzündung
DE3311351A1 (de) * 1983-03-29 1984-10-04 Robert Bosch Gmbh, 7000 Stuttgart Regeleinrichtung fuer die kraftstoffzumessung bei einer dieselbrennkraftmaschine
DE3623651C2 (de) * 1986-07-12 1995-01-26 Bosch Gmbh Robert Verfahren und Schaltungsanordnung zur Ermittlung eines Stellglied-Sollwertes
DE3628536A1 (de) * 1986-08-22 1988-03-03 Vdo Schindling Anordnung zur betaetigung eines stellgliedes
DE3730443A1 (de) * 1987-09-10 1989-03-23 Voest Alpine Automotive Verfahren zum steuern und regeln einer brennkraftmaschine und elektronische kraftstoff- einspritzeinrichtung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
ES2036411T3 (es) 1993-05-16
EP0394216A2 (de) 1990-10-24
EP0394216A3 (en) 1990-12-05
DE3912604C1 (enExample) 1990-11-08
ATE83045T1 (de) 1992-12-15
DE59000525D1 (de) 1993-01-14

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