EP0140065B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electronic apparatus for controlling the fuel amount in an internal combusion engine
Assignee: Robert Bosch GmbH
•
Filing: 1984-09-07
•
Granted: 1988-12-07
•
Expires: 2004-09-07
Abstract
Abstract The invention is directed to an apparatus for influencing control quantities of an internal combustion engine by means of which vibrations of the entire vehicle in the lower engine speed range, particularly at idling, are to be eliminated. This is accomplished by allocating to each cylinder a regulating unit which regulates the control quantities influencing the respective cylinder, such as fuel metering, exhaust gas recirculation, start of injection, duration of injection, air/fuel ratio, ignition time point, et cetera, for the smoothest possible running condition.
Inventors
- 👤 Thomas Dipl.-Ing. Küttner
- 👤 Wolf Ing. Grad. Wessel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 11:23
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1497; F02D41/1498; F02D2200/00; F02D2200/02; F02D2200/10; F02D2200/1015
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
151 words
Electronic apparatus for controlling the fuel amount in an internal combustion engine, having a first apparatus for providing a basic fuel amount dependent on rotational speed and load, and having a second apparatus with a synchronization facility, for the cylinder-specific influencing of the fuel amount, which is dependent on the difference between a nominal smooth running value and an actual smooth running value, characterized in that the second apparatus has a control with a proportional and integral behaviour assigned to each cylinder, wherein the period between two combustion instants is defined as the actual smooth running value and the average of all temporarily stored actual values is defined as the nominal smooth running value, and wherein the regulated value of the control is a fuel amount signal which is specific to the cylinder in question and which is combined additively with the basic fuel amount signal at the next injection process.
Claim 2
Dependent Claim
151 words
Electronic apparatus for controlling the fuel amount in an internal combustion engine, having a first apparatus for providing a basic fuel amount dependent on rotational speed and load, and having a second apparatus with a synchronization facility, for the cylinder-specific influencing of the fuel amount, which is dependent on the difference between a nominal smooth running value and an actual smooth running value, characterized in that the second apparatus has a control with a proportional and integral behaviour assigned to each cylinder, wherein the period between two combustion instants is defined as the actual smooth running value and the average of all temporarily stored actual values is defined as the nominal smooth running value, and wherein the regulated value of the control is a fuel amount signal which is specific to the cylinder in question and which is combined additively with the basic fuel amount signal at the next injection process.
Claim 3
Dependent Claim
30 words
Apparatus according to Claim 1, characterized in that, for the purpose of synchronization, instants are used which depend indirectly or directly on the instants of combustion in the individual cylinders.
Claim 4
Dependent Claim
21 words
Apparatus according to Claim 2, characterized in that the synchronizations are generated with the aid of reference signals, counters and comparators.
Claim 5
Dependent Claim
28 words
Apparatus according to Claim 3, characterized in that the reference signals are needle lift pulses, injection-begin pulses, combustion-begin pulses etc. which occur at every or every second revolution.
Claim 6
Dependent Claim
30 words
Apparatus according to Claim 4, characterized in that means for monitoring the synchronization are present which alter the subsequent synchronizations after an incorrect synchronization twice within a definable given period.
Claim 7
Dependent Claim
35 words
Apparatus according to at least one of Claims 1 to 5, characterized in that the fuel amount signals (S) averaged over a number of combustions corresponding to the number of cylinders are equal to zero.
Claim 8
Dependent Claim
50 words
Apparatus according to one of Claims 1 to 6, characterized in that means are provided which restrict the influencing of the basic fuel amount signals to a given definable rotational speed range and which prevent a sudden increase or decrease of the fuel amount signal in the bordering transitional ranges.
Claim 9
Dependent Claim
114 words
Electronic apparatus according to at least one of Claims 1 to 7, characterized in that the apparatus contains means for recording the momentary speed of the crankshaft which consist of a symmetrical segment wheel connected to the crankshaft and a time measuring facility for measuring the cycle time of a segment of the segment wheel through an ideal plane, lying vertical to the segment wheel, and in that the period between two combustion instants is divided by means of the segment wheel into two intervals, by which means that interval of the two which directly follows a combustion instant is shorter than the other interval and hence the instant of a combustion is detected.
Claim 10
Dependent Claim
35 words
Electronic apparatus according to Claim 8, characterized in that the instant of a combustion is detected even more reliably with the aid of an alternating arrangement of long and short segments on the segment wheel.
Claim 11
Dependent Claim
45 words
Electronic apparatus according to one of Claims 8 or 9, characterized in that a diagnosis of the functioning capability of the individual cylinders of the internal combustion engine is carried out with the aid of the different lengths of the two intervals between combustion instants.
Claim 12
Dependent Claim
74 words
Electronic apparatus according to one of Claims 8 or 9, characterized in that each interval is compared with the preceding and the succeeding interval, in that a synchronization counter is incremented upon each comparison, in that a check is performed depending on the result of the comparison of the synchronization counter and in that, depending on the checks of the synchronization counter performed within a definable given time, the synchronization is altered if necessary.
References Cited (Backward Citations)
FR2301691A1
Cited
US4179922A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.