Patent US4426981A successfully refreshed from Google Patents.
US4426981A
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US
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Apparatus for detecting the fuel quantity delivered to the combustion chambers of a diesel engine
Assignee: Robert Bosch GmbH
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Filing: 1981-08-21
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Granted: 1984-01-24
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Expires: 2001-08-21
Abstract
Abstract A fuel quantity measuring apparatus, preferably for a Diesel engine, is proposed in which the course of the fuel pressure is evaluated. A specialized pressure gradient of a first polarity marks the onset of supply or injection, and the maximum of the pressure gradient of the other polarity represents the end of injection or supply. The question of which designation prevails, whether injection onset and end or supply onset and end, is determined by the measurement location, that is, whether it is in the direction of the injection valve or in the direction of the supply element of the fuel supply pump. The injection quantity, for example, may be determined via the integral of the pressure during the metering period. It is recommended, when a piezoelectric pressure receptor is used, that a resistor-capacitor element be switched parallel thereto.
Inventors
- 👤 Max Greiner
- 👤 Helmut Laufer
- 👤 Max Straubel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:01
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D41/401; F02B; F02B3/00; F02B3/06; F02D41/0002; F02D2041/0022; F02D41/02; F02D41/14; F02D41/1401; F02D2041/1413; F02D2041/1432; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0602; F02D41/0025; F02D41/0047; F02D41/005; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
An apparatus for detecting the fuel quantity delivered to the combustion chambers of a Diesel engine comprising: a fuel pressure sensor for producing a pressure signal, a circuit processing means connected to said sensor for recognizing an onset control function and end of control function of one control procedure, said means including, first differentiating means responsive to said pressure signal and producing a threshold value signal of a first derivation serving as said onset of said control procedure, and a second differentiating means for twice differentiating said pressure signal serving as said end of said control procedure, and a time duration-detection means connected to said first and second differentiating means for detecting fuel quantity as the duration of time elapsing between said onset and said end of said control procedure.
Claim 2
Independent Claim
130 words
An apparatus for detecting the fuel quantity delivered to the combustion chambers of a Diesel engine comprising: a fuel pressure sensor for producing a pressure signal, a circuit processing means connected to said sensor for recognizing an onset control function and end of control function of one control procedure, said means including, first differentiating means responsive to said pressure signal and producing a threshold value signal of a first derivation serving as said onset of said control procedure, and a second differentiating means for twice differentiating said pressure signal serving as said end of said control procedure, and a time duration-detection means connected to said first and second differentiating means for detecting fuel quantity as the duration of time elapsing between said onset and said end of said control procedure.
Claim 3
Dependent Claim
30 words
An apparatus as defined by claim 1, wherein said fuel pressure sensor is for the detection of the injection time and disposed as close as possible to said combustion chambers.
Claim 4
Dependent Claim
21 words
An apparatus as defined by claim 1, wherein said fuel pressure sensor is disposed between said pump and said combustion chambers.
Claim 5
Dependent Claim
25 words
An apparatus as defined by claim 1, wherein said fuel pressure sensor is for measuring the duration of supply and is disposed on said pump.
Claim 6
Dependent Claim
23 words
An apparatus as defined by claim 1, wherein said circuit processing means provides a fuel quantity signal to an exhaust recirculation control means.
Claim 7
Dependent Claim
24 words
An apparatus as defined by claim 5, wherein said pressure signal is processed as an actual value provided to a fuel quantity regulation means.
Claim 8
Dependent Claim
18 words
An apparatus as defined by claim 1, wherein a filter is disposed subsequent to said fuel pressure sensor.
Claim 9
Dependent Claim
19 words
An apparatus as defined by claim 1, wherein a piezoelectric pressure transducer is provided as said fuel pressure sensor.
Claim 10
Dependent Claim
21 words
An apparatus as defined by claim 1, wherein said signal corresponding to said onset is provided to an onset regulation means.
Claim 11
Dependent Claim
15 words
A device according to claim 1 wherein said control procedure is a fuel injection procedure.
Claim 12
Dependent Claim
15 words
A device according to claim 1 wherein said control procedure is a fuel supply procedure.
References Cited (Backward Citations)
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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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |