US3581723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection arrangement for internal combustion engines with accelerating enrichment
Assignee: Robert Bosch GmbH
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Filing: 1969-06-18
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Granted: 1971-06-01
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Expires: 1989-06-18
Abstract
Abstract A fuel injection arrangement for enriching the air-fuel mixture during acceleration of the engine. The duration of a pulse applied to the electromagnetically actuated injection valve of the engine, is varied as a function of the pressure prevailing within the intake manifold of the engine. The pulse is supplied by a monostable multivibrator circuit which is actuated synchronously with the rotation of the engine crankshaft. The manifold includes two separate throttles with one throttle positioned by the gas pedal of the engine, and the second throttle positioned through a pressure difference sensing device which measures the difference between the pressure of the intake manifold between the two throttles, and in the intake direction of the manifold. A pressure sensor communicating with the intake manifold between the two throttles varies the inductance of a transformer which operates in conjunction with the monostable multivibrator.
Inventors
- 👤 Hermann Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:27
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
A fuel injection arrangement for an internal combustion engine comprising, in combination, at least one electromagnetically actuated injection valve; first throttle means within the intake manifold of said engine and actuated by the gas pedal of said engine; second throttle means within said intake manifold and behind said first throttle with respect to the intake direction of said intake manifold; means for controlling the position of said second throttle means as a function of the difference in pressures behind said first and second throttle means; pressure-sensing means communicating with said intake manifold between said first and second throttle means; and control means actuated synchronously with the crankshaft rotation of the engine and operatively coupled to said pressure-sensing means, said control means applying pulses to said injection valve for opening said valve, the duration of said pulses being dependent upon the pressure prevailing within said intake manifold.
Claim 2
Dependent Claim
146 words
A fuel injection arrangement for an internal combustion engine comprising, in combination, at least one electromagnetically actuated injection valve; first throttle means within the intake manifold of said engine and actuated by the gas pedal of said engine; second throttle means within said intake manifold and behind said first throttle with respect to the intake direction of said intake manifold; means for controlling the position of said second throttle means as a function of the difference in pressures behind said first and second throttle means; pressure-sensing means communicating with said intake manifold between said first and second throttle means; and control means actuated synchronously with the crankshaft rotation of the engine and operatively coupled to said pressure-sensing means, said control means applying pulses to said injection valve for opening said valve, the duration of said pulses being dependent upon the pressure prevailing within said intake manifold.
Claim 3
Dependent Claim
22 words
The fuel injection arrangement as defined in claim 1 wherein the opening time constant of said second throttle means is freely selectable.
Claim 4
Dependent Claim
66 words
The fuel injection arrangement as defined in claim 1 wherein said means for controlling said second throttle means comprises a pressure difference sensing device having a first pressure chamber communicating with the intake manifold in front of said second throttle means and having a second pressure chamber communicating with the intake manifold behind said second throttle means with respect to the intake direction of said manifold.
Claim 5
Dependent Claim
41 words
The fuel injection arrangement as defined in claim 3 including at least one connecting member between one of said chambers and said intake manifold; and means cooperating with said connecting means for applying substantial resistance to flow through said connecting means.
Claim 6
Dependent Claim
41 words
The fuel injection arrangement as defined in claim 4 wherein said means for applying resistance to flow through said connecting means comprises a member with an adjustable opening, said opening being decreased with increase in the operating temperature of said engine.
Claim 7
Dependent Claim
30 words
The fuel injection arrangement as defined in claim 5 including bimetallic spring means for adjusting the size of said opening as a function of the operating temperature of said engine.
Claim 8
Dependent Claim
115 words
The fuel injection arrangement as defined in claim 1 wherein said means for controlling said second throttle means comprises pressure-sensing means having a first chamber communicating with said intake manifold between said first and second throttle means; a second chamber separated from said first chamber and communicating with said intake manifold behind said second throttle means with respect to the intake direction of said manifold; a membrane member separating said first and second chambers; spring means within said second chamber aNd tensioning said membrane member; and linkage means connecting mechanically said second throttle means with said membrane member, whereby said second throttle means is positioned as a function of the position of said membrane member.
Claim 9
Dependent Claim
42 words
The fuel injection arrangement as defined in claim 7 including pipe means connecting said first chamber with said intake manifold between said first and second throttle means; and orifice means within said pipe means for restricting the flow through said pipe means.
Claim 10
Dependent Claim
17 words
The fuel injection arrangement as defined in claim 7 wherein said spring means comprises a compression spring.
Claim 11
Dependent Claim
66 words
The fuel injection arrangement as defined in claim 1 including monostable multivibrator means in said control means; switch means operated by the crankshaft of said engine and actuating said monostable multivibrator means; and transformer means operatively coupled to said monostable multivibrator means and to said pressure-sensing means, the inductance of said transformer means being varied as a function of the pressure sensed by said pressure-sensing 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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |