EP0507901A1 - Kraftstoffzumesssystem für eine brennkraftmaschine. - Google Patents
Kraftstoffzumesssystem für eine brennkraftmaschine.Info
- Publication number
- EP0507901A1 EP0507901A1 EP91917580A EP91917580A EP0507901A1 EP 0507901 A1 EP0507901 A1 EP 0507901A1 EP 91917580 A EP91917580 A EP 91917580A EP 91917580 A EP91917580 A EP 91917580A EP 0507901 A1 EP0507901 A1 EP 0507901A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- bypass
- throttle valve
- fuel metering
- angle
- 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
- F02D43/00—Conjoint electrical control of two or more functions, e.g. ignition, fuel-air mixture, recirculation, supercharging or exhaust-gas treatment
-
- 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
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
- F02D41/182—Circuit arrangements for generating control signals by measuring intake air flow for the control of a fuel injection device
Definitions
- the invention relates to a fuel metering system for an internal combustion engine according to the preamble of the main claim.
- a system is known from DE-A-31 20 667 in which the fuel metering signal is composed of two components. These two components are based on the separate air flows via the throttle valve and through the bypass channel to the throttle valve. The portion determined by the throttle valve can be determined both on the basis of the position signal of the throttle valve and by means of an air flow meter which is arranged directly in front of the throttle valve.
- the object of the invention is therefore to implement a system in which a basic injection signal is calculated, inter alia, from the throttle valve angle and control signal of the bypass actuator, which is not only used for closed, but also open throttle valve represents the total air mass flow actually sucked in by the engine.
- This signal can e.g. B. in the event of a failure of the main load transmitter in emergency operation or in the transition compensation as a dynamic basic injection signal.
- the fuel metering system according to the features of the main claims has the advantage over the known system of correctly determining the required amount of fuel and thus also maintaining a low pollutant-laden exhaust gas even in transition areas.
- FIG. 1 shows a rough overview of a fuel metering system for an internal combustion engine
- FIGS. 2 to 6 block diagrams relating to the formation of fuel metering signals based on throttle valve angle and control signal of the bypass actuator. Description of the embodiments
- FIG. 1 shows a rough schematic overview of the elements of interaction in the fuel metering system according to the invention for an internal combustion engine.
- the internal combustion engine itself is designated 10. It has an exhaust pipe 11 and an intake line 12, which has a throttle valve 13 and a bypass duct 14 surrounding this throttle valve 13 in its interior.
- a bypass valve 15 which in turn is controlled by a bypass signal box 16.
- a single injection valve 18 is also drawn in the intake manifold 12, which may also represent several injection valves.
- An accelerator pedal bears the reference numeral 19. It determines the position of the throttle valve 13.
- an air mass meter 23 is shown, which measures the air mass flow mL taken in as the main load sensor.
- a pressure sensor (not shown) is conceivable, which detects the intake manifold absolute pressure as the main load signal.
- 20 denotes a control unit which receives the air mass signal mL and a position signal DK corresponding to the respective throttle valve position, as well as a speed signal n from a speed sensor 21 and further sensors, of which a temperature sensor 22 is indicated as a representative. On the output side, the control unit operates the injection valve 18 and the bypass signal box 16.
- control unit 20 forms injection signals and control signals for the bypass signal box 16 starting, inter alia, from a signal corresponding to the air mass signal mL , the position of the throttle valve 13 and the speed, detected by means of the speed sensor 21.
- the invention now relates to the part of the control device 20 which is calculated independently of the air mass signal and speed
- Main basic injection signal tL s - ⁇ - calculates an additional basic injection signal n «K from the DK position and the bypass actuator control signal, which in stationary operation with all throttle valve positions and bypass actuator openings is as exactly as possible equal to the main basic injection signal.
- FIG. 2 shows a block diagram of the inventive formation of an additional basic injection signal tLF based on the signals DK as the throttle valve position and tau as the control signal for the signal box 16.
- the basic idea of the part of the fuel metering system shown in Figure 2 is that starting from the signals DK and a total area signal Fg is formed for the air flow area in the intake pipe, and this total area signal Fg subsequently, together with the speed, serves as input variables of a map for outputting a basic measurement signal.
- the throttle valve position signal DK arrives at a first block 25, in which a characteristic curve is stored which forms a relationship between the throttle valve angle DK and the surface DK.
- An area signal FDK is thus present on the output side of block 25.
- the control signal tau for the bypass signal box 16 arrives at a block 26 in which a characteristic curve Ftau plotted against tau is stored. Both output signals of blocks 25 and 26 arrive at a summation point 27, in which a signal is generated with respect to the total area Fg.
- a basic injection signal tLF is then read out as a function of speed n and the total area Fg, the end letter F being used as a sign that the basic injection signal was formed over the area.
- the throttle valve position signal and the control signal tau for the bypass signal box 16 are converted into virtual area signals and the total area as an input variable for the map with regard to the basic injection signal or a generally usable one Load signal is used.
- the methods according to FIGS. 3 to 5 are alternatives that are easier to apply.
- a basic injection signal tLW is determined, where W stands for angle.
- the basic idea is that the opening area of the bypass actuator, which is given by tau, is converted into a virtual angle by which the DK would have to be opened in addition to its actual position in order to open up the same additional area as the bypass. Actuator.
- the input variables are, in turn, the signal DK with respect to the throttle valve angle and the control signal for the bypass signal box 16. While the throttle valve signal DK is now passed directly to a summation point 30, the signal tau reaches the summation point 30 via a block 31.
- Block 31 symbolizes the Conversion of the control signal tau by means of a throttle valve-specific variable ctau.
- the output variable of this block 31 is then a virtual throttle valve angle DKvtau, which is likewise fed to the summation point 30.
- a signal is then available with respect to the virtual total throttle valve angle DKvg, which then determines the basic measurement signal tLW based on an angle determination together with a speed signal in a map 32.
- FIG. 4 shows in principle the same object as FIG. 3, but supplemented by controllability for the signal ctau, which acts on block 31.
- the reason for this is that in the simplest method according to FIG. 3, the conversion of the bypass approach Control signal dew in virtual DK change is only correct for one DK position. A specific additional DK area requires fewer additional virtual rotation angles with increasing DK opening. This is taken into account in FIG. 4 by means of a characteristic curve block 38 which is supplied with the signal DK on the input side. With this measure, the influence of the throttle valve position signal DK on the virtual bypass signal DKvtau can be adapted.
- a corresponding virtual air mass flow mLDK and mLtau via throttle valve and bypass by means of two characteristic curve blocks 42 and 43 is first assigned to the signals DK with respect to the throttle valve angle and tau as the control signal for the bypass signal box 16, in a subsequent summation point 44 these two individual air mass signals are combined to form a virtual total air mass signal mLg and this signal in turn is converted in a subsequent characteristic curve 45 into a virtual total throttle valve angle DKvg.
- the air mass flows are referred to as virtual, since they would only flow with large DK openings if there was a supercritical pressure ratio, but this is not the case.
- the map block 32 known from FIG. 3 for outputting a basic injection signal tLW.
- FIG. 6 shows the possibility of obtaining an injection signal based on the signals DK with respect to throttle valve position, n as the rotational speed and tau as the control signal for the bypass signal box 16.
- the signals DK and n are fed to a map 50.
- the load signal tLw is stored in this, which corresponds to the air mass flow flowing through the throttle valve when the bypass actuator is closed.
- the signal ⁇ tau tau - tauN given in brackets is then selected as the input signal for the block 54 and an air mass flow difference signal - »results as the output signal. mltau.
Landscapes
- 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)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4034473 | 1990-10-30 | ||
DE4034473A DE4034473A1 (de) | 1990-10-30 | 1990-10-30 | Kraftstoffzumesssystem fuer eine brennkraftmaschine |
PCT/DE1991/000800 WO1992008045A1 (de) | 1990-10-30 | 1991-10-10 | Kraftstoffzumesssystem für eine brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0507901A1 true EP0507901A1 (de) | 1992-10-14 |
EP0507901B1 EP0507901B1 (de) | 1996-03-27 |
Family
ID=6417308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91917580A Expired - Lifetime EP0507901B1 (de) | 1990-10-30 | 1991-10-10 | Kraftstoffzumesssystem für eine brennkraftmaschine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0507901B1 (de) |
JP (1) | JP2999260B2 (de) |
DE (2) | DE4034473A1 (de) |
WO (1) | WO1992008045A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1263579B (it) * | 1993-06-16 | 1996-08-27 | Weber Srl | Sistema per la regolazione della portata di aria aspirata da un motorea combustione interna. |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4873641A (en) * | 1986-07-03 | 1989-10-10 | Nissan Motor Company, Limited | Induction volume sensing arrangement for an internal combustion engine or the like |
DE3737699A1 (de) * | 1987-11-06 | 1989-05-18 | Bayerische Motoren Werke Ag | Steuereinrichtung fuer die einer brennkraftmaschine zuzufuehrende kraftstoffmenge |
US4951499A (en) * | 1988-06-24 | 1990-08-28 | Fuji Jukogyo Kabushiki Kaisha | Intake air calculating system for automotive engine |
JP2818805B2 (ja) * | 1988-12-08 | 1998-10-30 | 富士重工業株式会社 | エンジンの燃料噴射制御装置 |
-
1990
- 1990-10-30 DE DE4034473A patent/DE4034473A1/de not_active Withdrawn
-
1991
- 1991-10-10 WO PCT/DE1991/000800 patent/WO1992008045A1/de active IP Right Grant
- 1991-10-10 DE DE59107630T patent/DE59107630D1/de not_active Expired - Lifetime
- 1991-10-10 EP EP91917580A patent/EP0507901B1/de not_active Expired - Lifetime
- 1991-10-10 JP JP3516204A patent/JP2999260B2/ja not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9208045A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0507901B1 (de) | 1996-03-27 |
DE4034473A1 (de) | 1992-05-07 |
JP2999260B2 (ja) | 2000-01-17 |
WO1992008045A1 (de) | 1992-05-14 |
DE59107630D1 (de) | 1996-05-02 |
JPH05502923A (ja) | 1993-05-20 |
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