US4538580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection pump
Assignee: Robert Bosch GmbH
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Filing: 1983-10-19
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Granted: 1985-09-03
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Expires: 2003-10-19
Abstract
Abstract A fuel injection pump for internal combustion engines in which by means of an obliquely extending control groove on the jacket face of a distributor, the end of injection can be varied by opening a relief conduit during the displacement of the distributor. The injection onset is made to follow this variable end of injection by providing that the stroke position of the pump pistons of the fuel injection pump is ascertained at the end of injection by a transducer, by means of which at the same time a metering duration of a magnetic valve that has already been opened at the time of the end of the injection stroke is controlled. In this manner, with a radial piston pump so embodied, the opportunity is afforded of accurately adjusting the quantity of fuel to be metered by means of a magnetic valve, even with variable injection times. All that needs to be done is that the magnetic valve be closed exactly and rapidly at the end of metering, while an error in opening on the part of the magnetic valve does not occur. In this manner, a very precise metering of the fuel to be injected is attained with simple means.
Inventors
- 👤 Max Straubel
- 👤 Hermann Eisele
- 👤 Jean Leblanc
- 👤 Jean Pigeroulet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:50
CPC Classifications
F; F02; F02M; F02M41/00; F02M41/02; F02M41/06; F02M41/063; F02M59/00; F02M59/20; F02M59/36; F02M59/366
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
410 words
A fuel injection pump having at least one work chamber defined by a pump piston, which chamber communicates continuously with a distributor opening on a distributor rotating in a bore and coupled with a drive shaft and by means of this distributor opening the work chamber can upon the rotation of the distributor, be made to communicate in sequence during a supply stroke of the pump piston with supply lines disposed about the circumference of the bore and which leads to the fuel injection location, and the pump work chamber furthermore communicates continuously with a control groove in a jacket face of the distributor, said control groove being disposed obliquely with respect to the axis of said distributor cooperating with at least one opening discharging into the bore of a fuel conduit and communicates with a fuel supply source, and the distributor is axially displaceable with respect to said drive shaft while maintaining its rotational angle position and thus the rotational position of the control groove is variable with respect to the opening of the fuel conduit and of the drive shaft wherein the fuel conduit can be made to communicate via an electrically actuatable switching valve with the fuel supply source, and the switching valve is controllable during the intake stroke of the pump piston by an electrical control device in such a manner that the switching valve is at the latest opened after the opening, in its function as the metering opening of the fuel conduit, has been opened by the control groove and the switching valve is closed at a time that the control groove has still opened the opening of the fuel conduit, and that furthermore a transducer is associated with the distributor, said transducer has a movable part connected with the distributor and also has a stationary part, the stationary part being a receiver and the movable part having a control edge for triggering a pulse on the part of the receiver, an inclination B 1 of the control edge being opposite in the displacement direction of the distributor from an inclination α 1 of the control groove, which transducer ascertains an axial position of the distributor as a signal for the rotational position of the control groove with respect to the opening of the fuel conduit, which signal serves as signal for the onset of the metering of the fuel to be injected which is controlled by a control device via the switching valve.
Claim 2
Dependent Claim
410 words
A fuel injection pump having at least one work chamber defined by a pump piston, which chamber communicates continuously with a distributor opening on a distributor rotating in a bore and coupled with a drive shaft and by means of this distributor opening the work chamber can upon the rotation of the distributor, be made to communicate in sequence during a supply stroke of the pump piston with supply lines disposed about the circumference of the bore and which leads to the fuel injection location, and the pump work chamber furthermore communicates continuously with a control groove in a jacket face of the distributor, said control groove being disposed obliquely with respect to the axis of said distributor cooperating with at least one opening discharging into the bore of a fuel conduit and communicates with a fuel supply source, and the distributor is axially displaceable with respect to said drive shaft while maintaining its rotational angle position and thus the rotational position of the control groove is variable with respect to the opening of the fuel conduit and of the drive shaft wherein the fuel conduit can be made to communicate via an electrically actuatable switching valve with the fuel supply source, and the switching valve is controllable during the intake stroke of the pump piston by an electrical control device in such a manner that the switching valve is at the latest opened after the opening, in its function as the metering opening of the fuel conduit, has been opened by the control groove and the switching valve is closed at a time that the control groove has still opened the opening of the fuel conduit, and that furthermore a transducer is associated with the distributor, said transducer has a movable part connected with the distributor and also has a stationary part, the stationary part being a receiver and the movable part having a control edge for triggering a pulse on the part of the receiver, an inclination B 1 of the control edge being opposite in the displacement direction of the distributor from an inclination α 1 of the control groove, which transducer ascertains an axial position of the distributor as a signal for the rotational position of the control groove with respect to the opening of the fuel conduit, which signal serves as signal for the onset of the metering of the fuel to be injected which is controlled by a control device via the switching valve.
Claim 3
Dependent Claim
42 words
A fuel injection pump as defined by claim 1, in which the control groove is disposed obliquely with respect to the axis of the distributor, and the distributor is displaceable with respect to said drive shaft while maintaining its rotational angle position.
Claim 4
Dependent Claim
51 words
A fuel injection pump as defined by claim 1, in which said control groove is disposed parallel to the axis of the distributor, and the distributor is rotatable with respect to said drive shaft upon its displacement, by means of an oblique guide at its coupling point with the drive shaft.
Claim 5
Dependent Claim
76 words
A fuel injection pump as defined by claim 2, in which the transducer has a movable part connected with the distributor and also has a stationary part, the stationary part being a receiver and the movable part having a control edge triggering a pulse on the part of the receiver, the inclination β 1 of the control edge being opposite in the displacement direction of the distributor from the inclination α 1 of the control groove.
Claim 6
Dependent Claim
59 words
A fuel injection pump as defined by claim 3, in which the inclination β 2 of the control edge being opposite to the inclination α 2 of a reference line, which is generated by a point of the control groove with respect to a stationary object by the displacement of the distributor, relative to the axis of the distributor.
Claim 7
Dependent Claim
80 words
A fuel injection pump as detined by claim 1, characterized in that the amount of the inclination angle β of the oppositely extending control edge of the transducer part differs by a multiplication factor (k) from the amount of the inclination angle α, the factor corresponding to the ratio of the stroke variations per rotational angle during the intake stroke of the pump piston on the one hand and on the other during the pumping stroke of the pump piston.
Claim 8
Dependent Claim
80 words
A fuel injection pump as defined by claim 5, characterized in that the amount of the inclination angle β of the oppositely extending control edge of the transducer part differs by a multiplication factor (k) from the amount of the inclination angle α, the factor corresponding to the ratio of the stroke variations per rotational angle during th intake stroke of the pump piston on the one hand and on the other during the pumping stroke of the pump piston.
Claim 9
Dependent Claim
75 words
A fuel injection pump as defined by claim 6, in which the other part of the transducer has an additional control edge which triggers a control pulse on the part of the receiver, which control edge extends in the displacement direction of the distributor such that it extends in the same direction as the rotational position of the distributor, resulting upon the displacement of the distributor, relative to the rotational position of the drive shaft.
Claim 10
Dependent Claim
75 words
A fuel injection pump as defined by claim 7, in which the other part of the transducer has an additional control edge which triggers a control pulse on the part of the receiver, which control edge extends in the displacement direction of the distributor such that it extends in the same direction as the rotational position of the distributor, resulting upon the displacement of the distributor, relative to the rotational position of the drive shaft.
Claim 11
Dependent Claim
72 words
A fuel injection pump as defined by claim 1, in which two control grooves are disposed on the distributor and at the circumference of the bore guiding the distributor, at least one opening serving the purpose of fuel delivery from a conduit connected with the switching valve and one relief opening serving the purpose of carrying fuel away, and each of said openings are controllable in alternation by the two control grooves.
Claim 12
Dependent Claim
35 words
A fuel injection pump as defined by claim 1, in which a fuel reservoir serves as a fuel source having a variable volume, which is supplied by a fuel supply pump from a fuel supply.
Claim 13
Dependent Claim
42 words
A fuel injection pump as defined by claim 8, wherein the amount of the injection adjustment is ascertained in the control device as an actual value on the basis of any pulses triggered by the two control edges of the movable part.
Claim 14
Dependent Claim
42 words
A fuel injection pump as defined by claim 9, wherein the amount of the injection adjustment is ascertained in the control device as an actual value on the basis of any pulses triggered by the two control edges of the movable part.
Claim 15
Dependent Claim
47 words
A fuel injection pump as defined by claim 12, in which the actual value of the injection adjustment is compared in a comparison device with a set-point value and an adjusting device is controlled in accordance with the result of comparison in order to displace the distributor.
Claim 16
Dependent Claim
47 words
A fuel injection pump as defined by claim 13, in which the actual value of the injection adjustment is compared in a comparison device with a set-point value and an adjusting device is controlled in accordance with the result of comparison in order to displace the distributor.
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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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |