US3554169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection arrangement for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1969-01-21
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Granted: 1971-01-12
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Expires: 1989-01-21
Abstract
Abstract A fuel injection arrangement for internal combustion engines in which the duration is varied as a function of an operating characteristic of the engine. The timing of a monostable multivibrator is varied by varying the resistance values of magnetically-sensitive resistors mounted within a magnetic field which is varied as a function of a desired operating characteristic. A function sensor coupled to either the rotational speed, intake manifold pressure or throttle of the engine, varies the reluctance of the magnetic flux through a magnetic circuit path. The magnetically-sensitive resistors are mounted within the magnetic path so that the resistance values become varied through the function sensor.
Inventors
- 👤 Josef Wahl
- 👤 Wolfgang Reichardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:24
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
140 words
A fuel injection arrangement for internal combustion engines comprising, in combination, a controllable monostable multivibrator with a timing network for varying the timing of said monostable multivibrator, said timing of said monostable multivibrator determining the fuel injection duration for said internal combustion engine; magnetic means for establishing a magnetic field varying in intensity as a function of at least one operating characteristic of said engine; and magneticallysensitive resistor means connected to said monostable multivibrator and exposed to said magnetic field, said resistor means varying in resistance value as a function of the intensity of said magnetic field and thereby as a function of said operating characteristic of said engine, whereby said timing of said monostable multivibrator varies as a function of said resistance value of said resistor means and thereby as a function of said operating characteristic of said engine.
Claim 2
Dependent Claim
140 words
A fuel injection arrangement for internal combustion engines comprising, in combination, a controllable monostable multivibrator with a timing network for varying the timing of said monostable multivibrator, said timing of said monostable multivibrator determining the fuel injection duration for said internal combustion engine; magnetic means for establishing a magnetic field varying in intensity as a function of at least one operating characteristic of said engine; and magneticallysensitive resistor means connected to said monostable multivibrator and exposed to said magnetic field, said resistor means varying in resistance value as a function of the intensity of said magnetic field and thereby as a function of said operating characteristic of said engine, whereby said timing of said monostable multivibrator varies as a function of said resistance value of said resistor means and thereby as a function of said operating characteristic of said engine.
Claim 3
Dependent Claim
24 words
The fuel injection arrangement for internal combustion engines as defined in claim 1 wherein said operating characteristic is the rotational speed of said engine.
Claim 4
Dependent Claim
22 words
The fuel injection arrangement for internal combustion engines as defined in claim 1 wherein said operating characteristic is the intake manifold pressure.
Claim 5
Dependent Claim
24 words
The fuel injection arrangement for internal combustion engines as defined in claim 1 wherein said operating characteristic is the throttle position of said engine.
Claim 6
Dependent Claim
74 words
The fuel injection arrangement for internal combustion engines as defined in claim 1 including capacitor means in said timing network of said monostable multivibrator; transistor means with emitter-collector path connected to said capacitor means and applying charge transfer current to said capacitor means; and base voltage means including said magnetically-sensitive resistor means and connected to the base of said transistor means for controlling the magnitude of said charge transfer current to said capacitor means.
Claim 7
Dependent Claim
34 words
The fuel injection arrangement for internal combustion engines as defined in claim 5 including means for discharging said capacitor means of said timing network as a function of the rotational speed of said engine.
Claim 8
Dependent Claim
30 words
The fuel injection arrangement for internal combustion engines as defined in claim 6 including compensating transistor means for applying a limiting voltage for determining the discharge of said capacitor means.
Claim 9
Dependent Claim
66 words
The fuel injection arrangement for internal combustion engines as defined in claim 1 including function sensor means with magnetic means having air gaps, said magnetically-sensitive resistor means being arranged within said air gaps, the magnetic field intensity in said air gaps being varied as a function of said operating characteristic and thereby varying the timing of said monostable multivibrator as a function of said operating characteristic.
Claim 10
Dependent Claim
103 words
The fuel injection arrangement for internal combustion engines as defined in claim 8 wherein said function sensor is an intake manifold pressure sensor comprising two U-shaped magnets arranged with opposite poles facing each other through two air gaps and having each an opening through which a rod-shaped member is movable; pressure sensing means within the intake manifold of said engine and mounted on said rod-shaped member for moving said rod-shaped member in relation to the pressure prevailing within said intake manifold of said engine, said magnetically sensitive resistor means being two magnetically-sensitive resistors each within one air gap between said U-shaped magnetic members.
Claim 11
Dependent Claim
88 words
The fuel injection arrangement for internal combustion engines as defined in claim 8 wherein said function sensor comprises a three-part rod-shaped member including air gaps in which said resistor means is arranged, one of said parts being a disc-shaped magnet; and housing means surrounding said rod-shaped member and slidable as a function of the pressure prevailing within the intake manifold of said engine, whereby the resistance values of said resistor means and thereby the duration of fuel injection is varied as a function of the intake manifold pressure.
Claim 12
Dependent Claim
103 words
The fuel injection arrangement for internal combustion engines as defined in claim 8 wherein said function sensor comprises a cylindrical sleeve member with said resistor means being secured to the inner wall at the rim of said cylindrical sleeve member; a rod-shaped magnet arranged longitudinally within said cylindrical sleeve member; and two disc-shaped members mounted on said rod-shaped magnet and movable in relation to the pressure prevailing within the intake manifold of said engine, whereby the resistance value of said magnetically-sensitive resistor means and thereby the duration of fuel injection is varied as a function of the intake manifold pressure of said engine.
Claim 13
Dependent Claim
137 words
The fuel injection arrangement for internal combustion engines as defined in claim 8 wherein said function sensor comprises two three-poled magnets each having a center pole and two outer poles arranged so that opposite poles of the two magnets face each other through air gaps between the outer poles of said two magnets, said resistor means being two magnetically-sensitive resistors each arranged within the air gap between the outer poles of said magnets; and a rotatable magnetic member rotatable within an air gap between the center poles of said magnets and mechanically coupled to the throttle of said engine, whereby the resistance values of said magnetically-sensitive resistors are varied as a function of the throttle position of said engine for varying the duration of fuel injection thereby as a function of the throttle position of said engine.
Claim 14
Dependent Claim
123 words
The fuel injection arrangement for internal combustion engines as defined in claim 8 wherein said function sensor comprises a cap-shaped housing; a ring magnet arranged concentric with the axis of said cap-shaped housing and mounted within said housing, said resistor means being secured to the inner wall of said housing; a rotatable shaft coupled to the throttle of said engine and rotatable within said housing concentrically with the axis of said magnetic ring and said housing; and a cam-shaped member mounted on said shaft and varying the air gap between said resistor means and said cam-shaped member, whereby the resistance value of said resistor means and thereby the duration of said fuel injection is a function of the throttle position of said engine.
Claim 15
Dependent Claim
102 words
The fuel injection arrangement for internal combustion engines as defined in claim 7 including a function sensor for varying the timing of said monostable multivibrator and comprising a first member upon which said resistor means are mounted within a magnetic field of constant intensity; and a second member varying the overlapping surface between said resistor means and said second member, whereby said second member is coupled to said engine so that said second member varies said overlapping surface as a function of said operating characteristic and thereby vary the resistance value of said resistor means as a function of said operating characteristic.
Claim 16
Dependent Claim
121 words
The fuel injection arrangement for internal combustion engines as defined in claim 14 wherein said first member comprises a cap-shaped housing; a magnetic ring mounted within said housing and concentrically with the axis thereof, said resistor means being mounted on the rim of said cap-shaped housing, said secoNd member comprising a shaft coupled to the throttle of said engine and movable concentrically with the axis of said housing and said ring magnet, said second member including a cam mounted on said shaft and varying the surface of said resistor means covered by said cam, whereby the resistance value of said resistor means and thereby the duration of fuel injection is varied as a function of the throttle position of said engine.
References Cited (Backward Citations)
US2924633A
Cited
US3335708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |