US3661130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for limiting the rotational speed of internal combustion engines
Assignee: Robert Bosch GmbH
•
Filing: 1970-03-17
•
Granted: 1972-05-09
•
Expires: 1990-03-17
Abstract
Abstract An electronically controlled diesel engine wherein the highpressure chamber of the fuel injection pump is connected with the low-pressure chamber by a passage controlled by an electromagnetic valve which opens or closes when the rotational speed of the engine reaches a maximum permissible value. The speed is detected by an electrical counter which effects opening of the valve if the latter is installed in a passage which conveys fuel from the high-pressure chamber, or closing of such valve if the latter is installed in a passage which supplies fuel to the high-pressure chamber, whenever the engine speed reaches the maximum permissible value. The electrical connection between the speed counter and the valve comprises an amplifier whose input circuit contains an inductance of the speed counter and a first safety fuse and whose output circuit contains a relay switch for the circuit of the winding in the valve and a second safety fuse. The circuit of the winding can be completed by an auxiliary switch in response to actuation of the starter for the engine.
Inventors
- 👤 Franz Eheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:56
CPC Classifications
F; F02; F02M; F02M63/00; F02M63/02; F02M63/0205; F02M63/0215; F02M41/00; F02M41/08; F02M41/10; F02M41/12; F02M41/123; F02M41/125; F02M41/126; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
220 words
In an internal combustion engine, a combination comprising a fuel injection pump having a high-pressure fuel chamber, a lowpressure fuel chamber, and a passage connecting said chambers; a rotary member arranged to rotate at a variable speed which is proportional to the operating speed of the engine; electromagnet safety valve means including a valve member installed in said pump and movable between open and closed positions in which it respectively permits and prevents the flow of fuel through said passage, said valve member being arranged to assume one of said positions in response to energization and the other of said positions in response to deenergization of said valve means; electrical speed counter means comprising a serrated ferromagnetic element driven by said rotary member, a yoke having at least one serrated portion adjacent to said ferromagnetic element, a first and a second inductance on said yoke; a regulating circuit connecting said first inductance to said safety valve means to effect a change in the condition of energization of said safety valve means when the speed of said rotary member reaches a predetermined value; an electric control circuit connected to said second inductance; and means connected to said electronic control circuit for regulating supply of fuel by said injection pump to said engine in dependence on the speed of said rotary member.
Claim 2
Dependent Claim
220 words
In an internal combustion engine, a combination comprising a fuel injection pump having a high-pressure fuel chamber, a lowpressure fuel chamber, and a passage connecting said chambers; a rotary member arranged to rotate at a variable speed which is proportional to the operating speed of the engine; electromagnet safety valve means including a valve member installed in said pump and movable between open and closed positions in which it respectively permits and prevents the flow of fuel through said passage, said valve member being arranged to assume one of said positions in response to energization and the other of said positions in response to deenergization of said valve means; electrical speed counter means comprising a serrated ferromagnetic element driven by said rotary member, a yoke having at least one serrated portion adjacent to said ferromagnetic element, a first and a second inductance on said yoke; a regulating circuit connecting said first inductance to said safety valve means to effect a change in the condition of energization of said safety valve means when the speed of said rotary member reaches a predetermined value; an electric control circuit connected to said second inductance; and means connected to said electronic control circuit for regulating supply of fuel by said injection pump to said engine in dependence on the speed of said rotary member.
Claim 3
Dependent Claim
47 words
A combination as defined in claim 1, wherein said passage is arranged to supply fuel from said low-pressure chamber to said high-pressure chamber and wherein said valve member is moved to closed position in response to said change in the condition of energization of said safety valve.
Claim 4
Dependent Claim
47 words
A combination as defined in claim 1, wherein said passage is arranged to convey fuel from said high-pressure chamber to said low-pressure chamber and wherein said valve member is moved to open position in response to said change in the condition of energization of said safety valve.
Claim 5
Dependent Claim
58 words
A combination as defined in claim 1, wherein said regulating circuit connecting said speed counter means with said valve comprises amplifier means having an input circuit including a portion of said speed counter means and an output circuit arranged to effect changes in energization of said safety valve means in dependency on the condition of said input circuit.
Claim 6
Dependent Claim
24 words
A combination as defined in claim 4, wherein said output circuit includes a relay having a switch in circuit with said safety valve means.
Claim 7
Dependent Claim
38 words
A combination as defined in claim 5, wherein at least one of said input and output circuits includes a safety fuse arranged to open the respective circuit when the speed of said rotary member reaches said predetermined valve.
Claim 8
Dependent Claim
14 words
A combination as defined in claim 6, wherein said fuse is an electronic fuse.
Claim 9
Dependent Claim
20 words
A combination as defined in claim 6, wherein each of said input and output circuits includes at least one fuse.
Claim 10
Dependent Claim
39 words
A combination as defined in claim 1, further comprising starter means actuatable to start the engine and means for effecting a change in the condition of energization of said valve means in response to actuation of said starter means.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |