Patent US4051818A successfully refreshed from Google Patents.
US4051818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for obtaining signals for the control unit of an electronic fuel injection system
Assignee: Volkswagen AG
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Filing: 1975-10-30
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Granted: 1977-10-04
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Expires: 1995-10-30
Abstract
Abstract A device modifies the signals for the control unit of an electronic fuel injection system of an internal combustion engine in order to reduce lengthwise vehicle vibrations. The signals are derived from a tachometer that measures the engine speed and a gauge that measures the air flow supply to the engine. The device dampens the a.c. components in the signal either symmetrically or asymmetrically. This device can be in the form of a passive RC circuit with diodes to determine the operating points or it can be an active circuit.
Inventors
- 👤 Jurgen Volckers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:17
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/46; F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D2041/1413; F02D2041/1432
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
An electronic fuel injection system of an internal combustion engine comprising: rotational speed measuring means for measuring the engine speed; air measuring means for measuring at least one of the flow of air supplied to the engine and the air intake pressure; analog signal means for assuring the creation of analog voltage signals from the output signals of said measuring means; at least one stabilizing means having a low pass transfer characteristic with a cut-off frequency in the range from about 2 to 8 Hz, said stabilizing means receiving the analog signal of at least one of said measuring means and producing a signal in which the a.c. voltage components resulting from longitudinal vehicle vibrations that occur in the analog voltage signal have been dampened; and a control unit for controlling the injection of fuel in response to at least the dampened signal from said stabilizing means.
Claim 2
Dependent Claim
147 words
An electronic fuel injection system of an internal combustion engine comprising: rotational speed measuring means for measuring the engine speed; air measuring means for measuring at least one of the flow of air supplied to the engine and the air intake pressure; analog signal means for assuring the creation of analog voltage signals from the output signals of said measuring means; at least one stabilizing means having a low pass transfer characteristic with a cut-off frequency in the range from about 2 to 8 Hz, said stabilizing means receiving the analog signal of at least one of said measuring means and producing a signal in which the a.c. voltage components resulting from longitudinal vehicle vibrations that occur in the analog voltage signal have been dampened; and a control unit for controlling the injection of fuel in response to at least the dampened signal from said stabilizing means.
Claim 3
Dependent Claim
51 words
A system according to claim 1 wherein the stabilizing means asymmetrically dampens the a.c. voltage components, the asymmetry being such that the resulting variation in the average value of the analog voltage signal arrives at the control unit as a fattening signal directing the control unit to increase the fuel supply.
Claim 4
Dependent Claim
86 words
A system according to claim 2 wherein the stabilizing means comprises: an RC combination of a resistance connected between the input and output of the stabilizing means and a capacitance connected across the output of the stabilizating means; and two series circuits comprising a diode and a bias resistance, both circuits being in parallel with the resistance of the RC combination, the diodes of the two circuits being oppositely directed and the bias resistances of the two circuits having a different values for determining the asymmetry.
Claim 5
Dependent Claim
18 words
A system according to claim 3 wherein one of the bias resistances has a value equal to zero.
Claim 6
Dependent Claim
38 words
A system according to claim 1 wherein the stabilizing means comprises an RC combination of a resistance connected between the input and output of the stabilizing means and a capacitance connected across the output of the stabilizing means.
Claim 7
Dependent Claim
25 words
A system according to claim 5 wherein the stabilizing means further includes at least one diode in parallel with the resistance of the RC combination.
Claim 8
Dependent Claim
58 words
A system according to claim 5 wherein the stabilizing means comprises a plurality of diodes in series between the input and output of the stabilizing means, and an a.c. voltage amplifier for the a.c. voltage components with its input connected to the input of the stabilizing means and its output connected between two of the plurality of diodes.
Claim 9
Dependent Claim
37 words
A system according to claim 7 further including at least one additional diode in parallel with the resistance, said additional diode having a higher threshold voltage than the plurality of diodes and being directed opposite to them.
Claim 10
Dependent Claim
103 words
A system according to claim 1 wherein the stabilizing means follows a rotational speed measuring means that is impressed with ignition impulses from the engine and which comprises: a first monostable flip-flop that transposes the ignition impulses into pulses of predetermined duration; a first integrator means actuated by the pulses of predetermined duration for producing a charging signal from a reference voltage within the pulse intervals and discharging during the pulses; and track-storage means for forming an analog voltage signal matching the peaks of the results of the integration by the first integrator means, said analog voltage being supplied to the stabilizing means.
Claim 11
Dependent Claim
106 words
A system according to claim 9 wherein the analog voltage signal leaving the stabilizing means is transformed into simulated ignition pulses by a transducer, said transducer comprising: a second integrator means having the same time constant and reference voltage as the first integrator; an amplitude comparator for comparing the outputs of the stabilizer means and the second integrator means; and a second monostable flip-flop having the same time constant as the first monostable flip-flop for generating simulated ignition signals in response to the output of the amplitude comparator and supplying them to the control unit, said simulated ignition pulses being used to actuate the second integrator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |