US4375207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Top speed limiter for an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1980-08-18
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Granted: 1983-03-01
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Expires: 2000-08-18
Abstract
Abstract The maximum speed in an internal combustion engine is limited by circuitry which can be adjusted to conditions requiring a lower-than-normal top speed, for example during initial delivery to the customer and during the break-in period of the engine. The top speed limiter includes a comparator for suppressing or altering the fuel injection pulses. As a feature of the invention, the reference signal applied to the comparator and representing the top engine speed can be changed either manually or on the basis of elapsed time or mileage.
Inventors
- 👤 Albrecht Sieber
- 👤 Peter Schulzke
- 👤 Dieter Gunther
- 👤 Ulrich Steinbrenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:24
CPC Classifications
G; G05; G05D; G05D13/00; G05D13/02; G05D13/04; F; F02; F02D; F02D31/00; F02D31/001; F02D31/007; F02D31/009
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
147 words
A top speed limiter in combination with a fuel injection system for the breaking-in period of an internal combustion engine, a means for generating a pulse train which indicates engine speed, wherein the system includes a fuel supply means which receives the pulse train, and wherein the top speed limiter comprises: a timing circuit means for generating a selectable variable reference speed signal, wherein the circuit means includes a manually adjustable switch; means for adjusting said timing circuit means on the basis of an elapsed mileage signal; comparator means for comparing the reference speed signal with the pulse train and for generating a suppress command signal; and suppressor means for receiving the pulse train and the suppress command signal, wherein the suppressor means suppresses the pulse train to the fuel supply means to inhibit the supply of fuel to the system on receiving the suppress command signal.
Claim 2
Dependent Claim
147 words
A top speed limiter in combination with a fuel injection system for the breaking-in period of an internal combustion engine, a means for generating a pulse train which indicates engine speed, wherein the system includes a fuel supply means which receives the pulse train, and wherein the top speed limiter comprises: a timing circuit means for generating a selectable variable reference speed signal, wherein the circuit means includes a manually adjustable switch; means for adjusting said timing circuit means on the basis of an elapsed mileage signal; comparator means for comparing the reference speed signal with the pulse train and for generating a suppress command signal; and suppressor means for receiving the pulse train and the suppress command signal, wherein the suppressor means suppresses the pulse train to the fuel supply means to inhibit the supply of fuel to the system on receiving the suppress command signal.
Claim 3
Dependent Claim
23 words
An apparatus according to claim 1, further comprising a timing member connected between the output of said comparator and said fuel supply means.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 5, including means for applying said suppress command signal to said fuel supply means for a selectable period of time.
Claim 5
Dependent Claim
46 words
An apparatus according to claim 1, wherein said comparator means is an analog comparator receiving an analog input signal constituting said actual engine speed signal and wherein said means for generating a selectably variable reference speed signal is a voltage divider also generating an analog signal.
Claim 6
Dependent Claim
19 words
An apparatus according to claim 4, wherein said voltage divider is adjustable to provide a variable output reference signal.
Claim 7
Dependent Claim
19 words
An apparatus according to claim 5, further comprising diode switching means for controlling the magnitude of said reference voltage.
Claim 8
Dependent Claim
19 words
An apparatus according to claim 1, wherein said comparator means is a circuit for receiving and processing digital signals.
Claim 9
Dependent Claim
147 words
A top speed limiter in combination with a fuel injection system for the breaking-in period of an internal combustion engine, a means for generating a pulse train which indicates engine speed, wherein the system includes a fuel supply means which receives the pulse train, and wherein the top speed limiter comprises: a timing circuit means for generating a selectable variable reference speed signal, wherein the circuit means includes a manually adjustable switch; means for adjusting said timing circuit means on the basis of an elapsed time signal; comparator means for comparing the reference speed signal with the pulse train and for generating a suppress command signal; and suppressor means for receiving the pulse train and the suppress command signal, wherein the suppressor means suppresses the pulse train to the fuel supply means to inhibit the supply of fuel to the system on receiving the suppress command signal.
Claim 10
Dependent Claim
147 words
A top speed limiter in combination with a fuel injection system for the breaking-in period of an internal combustion engine, a means for generating a pulse train which indicates engine speed, wherein the system includes a fuel supply means which receives the pulse train, and wherein the top speed limiter comprises: a timing circuit means for generating a selectable variable reference speed signal, wherein the circuit means includes a manually adjustable switch; means for adjusting said timing circuit means on the basis of an elapsed time signal; comparator means for comparing the reference speed signal with the pulse train and for generating a suppress command signal; and suppressor means for receiving the pulse train and the suppress command signal, wherein the suppressor means suppresses the pulse train to the fuel supply means to inhibit the supply of fuel to the system on receiving the suppress command signal.
Claim 11
Dependent Claim
23 words
An apparatus according to claim 8, further comprising a timing member connected between the output of said comparator and said fuel supply means.
Claim 12
Dependent Claim
25 words
An apparatus according to claim 9, including means for applying said suppress command signal to said fuel supply means for a selectable period of time.
Claim 13
Dependent Claim
19 words
An apparatus according to claim 8, wherein said comparator circuit is a circuit for receiving and processing digital signals.
References Cited (Backward Citations)
US3736910A
Cited
US4117815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |