Patent US5385129A successfully refreshed from Google Patents.
US5385129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and method for equalizing fuel-injection quantities among cylinders of an internal combustion engine
Assignee: Robert Bosch GmbH
•
Filing: 1993-11-08
•
Granted: 1995-01-31
•
Expires: 2013-11-08
Abstract
Abstract In a system and method for equalizing fuel-injection quantities among cylinders of an internal combustion engine, angular acceleration is measured during the combustion process of each cylinder of the internal combustion engine. The individual measured values of the angular acceleration are compared to one another. In case of deviations between the individual measured values, the fuel-injection quantity is altered in a way that allows for the deviations to be compensated.
Inventors
- 👤 Wilhelm Eyberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:33
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/008; F02D41/0085; F02D2200/00; F02D2200/02; F02D2200/10; F02D2200/1015; F02D41/0097; F02D41/02; F02D41/14; F02D41/1497; F02D41/1498
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
122 words
A system for equalizing fuel-injection quantities among cylinders of an internal combustion engine of a vehicle, comprising: a fuel metering device for injecting a quantity of fuel into each cylinder of the engine; a controller coupled to the fuel metering device; the controller determining an angular acceleration of at least one of a crankshaft and camshaft of the vehicle during a combustion process at each cylinder; the controller comparing the determined angular accelerations to detect a deviation between at least two determined angular accelerations; and the controller controlling the fuel metering device to alter the quantity of fuel injected into one or more of the cylinders of the engine in order to compensate for a deviation, if such a deviation is detected.
Claim 2
Independent Claim
122 words
A system for equalizing fuel-injection quantities among cylinders of an internal combustion engine of a vehicle, comprising: a fuel metering device for injecting a quantity of fuel into each cylinder of the engine; a controller coupled to the fuel metering device; the controller determining an angular acceleration of at least one of a crankshaft and camshaft of the vehicle during a combustion process at each cylinder; the controller comparing the determined angular accelerations to detect a deviation between at least two determined angular accelerations; and the controller controlling the fuel metering device to alter the quantity of fuel injected into one or more of the cylinders of the engine in order to compensate for a deviation, if such a deviation is detected.
Claim 3
Dependent Claim
60 words
The system as recited in claim 1, wherein the controller determines a rotational speed at each of a first and second segment of a segmented wheel, determines a difference between the rotational speeds, determines a run-through time of a third and fourth segment of the segmented wheel, and divides the difference by the run-through time to determine the angular accelerations.
Claim 4
Dependent Claim
19 words
The system as recited in claim 1, wherein the controller further determines an average value of the angular accelerations.
Claim 5
Dependent Claim
25 words
The system as recited in claim 3, wherein the average value is determined as a sliding average over all of the cylinders of the engine.
Claim 6
Dependent Claim
54 words
The system as recited in claim 3, wherein the controller further compares each of the angular accelerations to the average value to determine a deviating angular acceleration, and controls the fuel metering device to inject an additional fuel quantity into the cylinder corresponding to the deviating angular acceleration during a subsequent fuel injection process.
Claim 7
Dependent Claim
19 words
The system as recited in claim 5, wherein the subsequent fuel injection process is the next fuel injection process.
Claim 8
Dependent Claim
26 words
The system as recited in claim 5, wherein the additional fuel quantity is proportional to a difference between the deviating angular acceleration and the average value.
Claim 9
Dependent Claim
33 words
The system as recited in claim 5, wherein the controller continuously compares the angular accelerations to the average value, and controls the fuel metering device to inject a plurality of additional fuel quantities.
Claim 10
Dependent Claim
24 words
The system as recited in claim 8, wherein the controller continuously adds the additional fuel quantities to form a cumulative value for each cylinder.
Claim 11
Dependent Claim
15 words
The system as recited in claim 9, wherein the cumulative value is equal to zero.
Claim 12
Independent Claim
100 words
A method of equalizing fuel-injection quantities among cylinders of an internal combustion engine of a vehicle, comprising the steps of: determining an angular acceleration of at least one of a crankshaft and camshaft of the vehicle during a combustion process at each cylinder; comparing the determined angular accelerations to detect a deviation between at least two determined angular accelerations; and controlling a fuel metering device to alter the quantity of fuel injected by the fuel metering device into one or more of the cylinders of the engine in order to compensate for a deviation, if such a deviation is detected.
Claim 13
Independent Claim
100 words
A method of equalizing fuel-injection quantities among cylinders of an internal combustion engine of a vehicle, comprising the steps of: determining an angular acceleration of at least one of a crankshaft and camshaft of the vehicle during a combustion process at each cylinder; comparing the determined angular accelerations to detect a deviation between at least two determined angular accelerations; and controlling a fuel metering device to alter the quantity of fuel injected by the fuel metering device into one or more of the cylinders of the engine in order to compensate for a deviation, if such a deviation is detected.
Claim 14
Dependent Claim
65 words
The method as recited in claim 11, wherein the method further comprises the steps of: determining a rotational speed at each of a first and second segment of a segmented wheel; determining a difference between the rotational speeds; determining a run-through time of a third and fourth segment of the segmented wheel; and dividing the difference by the run-through time to determine the angular accelerations.
Claim 15
Dependent Claim
23 words
The method as recited in claim 11, wherein the method further comprises the step of determining an average value of the angular accelerations.
Claim 16
Dependent Claim
25 words
The method as recited in claim 13, wherein the average value is determined as a sliding average over all of the cylinders of the engine.
Claim 17
Dependent Claim
52 words
The method as recited in claim 13, wherein the method further comprises the steps of: comparing each of the angular accelerations to the average value to determine a deviating angular acceleration; and injecting an additional fuel quantity into the cylinder corresponding to the deviating angular acceleration during a subsequent fuel injection process.
Claim 18
Dependent Claim
19 words
The method as recited in claim 15, wherein the subsequent fuel injection process is the next fuel injection process.
Claim 19
Dependent Claim
26 words
The method as recited in claim 15, wherein the additional fuel quantity is proportional to a difference between the deviating angular acceleration and the average value.
Claim 20
Dependent Claim
27 words
The method as recited in claim 15, wherein the angular accelerations are continuously compared to the average value, and a plurality of additional fuel quantities are injected.
Claim 21
Dependent Claim
29 words
The method as recited in claim 18, wherein the method further comprises the step of continuously adding the additional fuel quantities to form a cumulative value for each cylinder.
Claim 22
Dependent Claim
15 words
The method as recited in claim 19, wherein the cumulative value is equal to zero.
References Cited (Backward Citations)
US4642773A
Cited
US4688535A
Cited
US5239473A
Cited
US5278760A
Cited
US5156128A
Cited
US5265575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-30 | 1998-08-01 | 1999-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-30 | 2002-08-01 | 2003-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-30 | 2006-08-01 | 2007-01-31 | $7700.00 | Window Closed / Lapsed |