US3941100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing an engine-speed signal for an electronic fuel injection system
Assignee: Volkswagen AG
•
Filing: 1974-04-04
•
Granted: 1976-03-02
•
Expires: 1994-04-04
Abstract
Abstract Apparatus for producing a signal representative of engine speed (RPM) for use in an electronically controlled fuel injection system. The apparatus includes means for producing a first train of pulses in which the pulse intervals are dependent upon engine speed, and a signal processor for receiving the first train of pulses and producing a second train of pulses in which the pulse intervals correspond, at least approximately, to the mean value of the pulse intervals in the first pulse train.
Inventors
- 👤 Gotthard Bensch
- 👤 Gustav Ehrich
- 👤 Peter Fendler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:10
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
An electronically controlled fuel injection system comprising, in combination: a. signal generating means for producing a first train of pulses in which the pulse intervals are dependent upon engine RPM; b. signal processing means, connected to said signal generating means, for producing a second train of pulses in which the pulse intervals are dependent, at least approximately, upon the mean value of pulse intervals in said first pulse train within a given pulse sequence, thereby at least reducing pulse interval changes of short duration, said signal processing means including:
Claim 2
Dependent Claim
89 words
An electronically controlled fuel injection system comprising, in combination: a. signal generating means for producing a first train of pulses in which the pulse intervals are dependent upon engine RPM; b. signal processing means, connected to said signal generating means, for producing a second train of pulses in which the pulse intervals are dependent, at least approximately, upon the mean value of pulse intervals in said first pulse train within a given pulse sequence, thereby at least reducing pulse interval changes of short duration, said signal processing means including:
Claim 3
Dependent Claim
124 words
pulse frequency divider means connected to said signal generating means; 2. integrator means connected to said pulse frequency divider means; 3. pulse frequency multiplier means connected to said integrator means, said pulse frequency divider means and said pulse frequency multiplier means having the same factor of division and multiplication, respectively, so that the output of said pulse frequency multiplier means exhibits approximately the same pulse frequency as said first pulse train; and 4. trigger means, connected to said pulse frequency multiplier means, for producing an output signal whenever the input thereto reaches a prescribed value; and c. fuel injection means, connected to said signal processing means, for injecting fuel into an internal combustion engine upon receipt of said pulses of said second pulse train.
Claim 4
Dependent Claim
124 words
pulse frequency divider means connected to said signal generating means; 2. integrator means connected to said pulse frequency divider means; 3. pulse frequency multiplier means connected to said integrator means, said pulse frequency divider means and said pulse frequency multiplier means having the same factor of division and multiplication, respectively, so that the output of said pulse frequency multiplier means exhibits approximately the same pulse frequency as said first pulse train; and 4. trigger means, connected to said pulse frequency multiplier means, for producing an output signal whenever the input thereto reaches a prescribed value; and c. fuel injection means, connected to said signal processing means, for injecting fuel into an internal combustion engine upon receipt of said pulses of said second pulse train.
Claim 5
Dependent Claim
48 words
The apparatus defined in claim 1, wherein said pulse frequency multiplier means includes at least one pulse frequency doubler, connected to said integrator means, said pulse frequency doubler having two output-coupled rectifying branches, one of which contains means for inverting the integrated voltage output of said integrator means.
References Cited (Backward Citations)
US3340476A
Cited
US3581723A
Cited
US3685526A
Cited
US3809029A
Cited
US3750631A
Cited
US3811420A
Cited
US3724433A
Cited
US3742920A
Cited
US3782347A
Cited
US3821659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |