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US5131371A
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Method and arrangement for controlling a self-igniting internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1990-09-07
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Granted: 1992-07-21
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Expires: 2010-09-07
Abstract
Abstract The invention is directed to a method and arrangement for controlling a self-igniting internal combustion engine. The arrangement includes at least one measured-value sensor, electronic control unit for forming a quantity signal for metering fuel, and a control unit for driving individual actuators for each cylinder. The actuators determine the quantity of fuel injected by the pump elements into the cylinders. Under specific conditions, a corrective unit is activated which determines corrective values specific to the cylinders for making the cylinders equal. The open-loop control unit applies the metering signal to the actuators in dependence upon the quantity signal and the corrective values.
Inventors
- 👤 Josef Wahl
- 👤 Alf Loffler
- 👤 Hermann Grieshaber
- 👤 Wilhelm Polach
- 👤 Ewald Eblen
- 👤 Joachim Tauscher
- 👤 Helmut Laufer
- 👤 Ulrich Flaig
- 👤 Johannes Locher
- 👤 Manfred Birk
- 👤 Gerhard Engel
- 👤 Alfred Schmitt
- 👤 Pierre Lauvin
- 👤 Fridolin Piwonka
- 👤 Anton Karle
- 👤 Hermann Kull
- 👤 Werner Zimmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:22
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/008; F02D41/0085; F02D41/0087; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F02D41/2432; F02D41/2438; F02D41/2441; F02D41/2451; F02B; F02B3/00; F02B3/06; F02D2250/00; F02D2250/18; F02D2250/32; F02D41/2464; F02D41/2467
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
191 words
A method for controlling a self-igniting internal combustion engine having a plurality of cylinders and sensor means for measuring at least one of the variables including exhaust gas temperature, lambda value, engine speed and engine torque, an electronic closed-loop control unit for forming a quantity signal for metering fuel and an open-loop control unit for driving an actuator for a specific cylinder, the actuator determining the quantity of fuel injected by a pump element into a cylinder, the method comprising the steps of: activating corrective means under specific conditions to make ready corrective vales specific to the cylinders for equalizing the cylinders; sequentially reducing or interrupting the fuel metered to each one of the cylinders and measuring the reaction on the one variable measured by said sensor means to determine the amount by which the measured variable is reduced; utilizing said corrective means to compute a corrective value for each one of said cylinders in dependence upon the amount determined for the cylinder; permanently storing the corrective values; and, causing said open-loop control unit to charge said actuators with metering signals in dependence upon said quantity signal and said corrective values.
Claim 2
Independent Claim
191 words
A method for controlling a self-igniting internal combustion engine having a plurality of cylinders and sensor means for measuring at least one of the variables including exhaust gas temperature, lambda value, engine speed and engine torque, an electronic closed-loop control unit for forming a quantity signal for metering fuel and an open-loop control unit for driving an actuator for a specific cylinder, the actuator determining the quantity of fuel injected by a pump element into a cylinder, the method comprising the steps of: activating corrective means under specific conditions to make ready corrective vales specific to the cylinders for equalizing the cylinders; sequentially reducing or interrupting the fuel metered to each one of the cylinders and measuring the reaction on the one variable measured by said sensor means to determine the amount by which the measured variable is reduced; utilizing said corrective means to compute a corrective value for each one of said cylinders in dependence upon the amount determined for the cylinder; permanently storing the corrective values; and, causing said open-loop control unit to charge said actuators with metering signals in dependence upon said quantity signal and said corrective values.
Claim 3
Dependent Claim
31 words
The method of claim 1, wherein said corrective means are activated at the end of the assembly line of the engine manufacturer in specific intervals and/or at selected steady-state operating points.
Claim 4
Dependent Claim
30 words
The method of claim 1, wherein the corrective values are computed in dependence upon at least one of the variables exhaust gas temperature, lambda value, engine speed and engine torque.
Claim 5
Dependent Claim
54 words
The method of claim 1, wherein the corrective value for each cylinder is computed from an increase of the time duration DZ of the metering signals of the remaining cylinders which is necessary in order to obtain the measured value which is given ahead of the reduction of the fuel metered to each cylinder.
Claim 6
Dependent Claim
15 words
The method of claim 1, wherein the corrective values are determined at different operating points.
Claim 7
Dependent Claim
18 words
The method of claim 1, wherein the corrective values are stored in dependence upon load and engine speed.
Claim 8
Dependent Claim
217 words
An arrangement for controlling a self-igniting internal combustion engine, the arrangement comprising: sensor means for measuring at least one of the variables including exhaust gas temperature, lambda value, engine speed and engine torque; an electronic closed-loop control unit for forming a quantity signal for metering fuel to the engine; a plurality of pump elements for pumping the fuel to be metered to said cylinders; a plurality of actuators for determining the quantity of fuel to be injected into respective ones of said cylinders by corresponding ones of said pump elements; an open-loop control for sequentially cylinder-specifically driving individual ones of said actuators for sequentially reducing or interrupting the fuel metered to each one of the cylinders; corrective means for making available cylinder-specific corrective values; said corrective means being adapted to measure the reaction on said one variable to determine the amount by which the measured variable is reduced for each one of said cylinders and then determine the corrective value for each one of said cylinders in dependence upon said amount; said corrective means including torque means for permanently storing said values; activating means for activating said corrective means under specific conditions; and, said open-loop control unit being adapted to charge said actuators with respective metering signals in dependence upon said quantity signal and said corrective values.
Claim 9
Dependent Claim
217 words
An arrangement for controlling a self-igniting internal combustion engine, the arrangement comprising: sensor means for measuring at least one of the variables including exhaust gas temperature, lambda value, engine speed and engine torque; an electronic closed-loop control unit for forming a quantity signal for metering fuel to the engine; a plurality of pump elements for pumping the fuel to be metered to said cylinders; a plurality of actuators for determining the quantity of fuel to be injected into respective ones of said cylinders by corresponding ones of said pump elements; an open-loop control for sequentially cylinder-specifically driving individual ones of said actuators for sequentially reducing or interrupting the fuel metered to each one of the cylinders; corrective means for making available cylinder-specific corrective values; said corrective means being adapted to measure the reaction on said one variable to determine the amount by which the measured variable is reduced for each one of said cylinders and then determine the corrective value for each one of said cylinders in dependence upon said amount; said corrective means including torque means for permanently storing said values; activating means for activating said corrective means under specific conditions; and, said open-loop control unit being adapted to charge said actuators with respective metering signals in dependence upon said quantity signal and said corrective values.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |