US4738237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Idling control for an otto engine
Assignee: Schaeffler Engineering GmbH
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Filing: 1986-12-30
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Granted: 1988-04-19
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Expires: 2006-12-30
Abstract
Abstract An idling control for an Otto engine comprises a throttle valve positioned in a suction pipe of an engine intake manifold; a pneumatic cylinder unit operably engaged with said throttle valve by means of a positioning leg; a three-way flow control valve in fluid communication with said pneumatic cylinder unit, said valve having respective input conduits for atmospheric pressure and vacuum, and having means for alternatively transmitting said atmospheric pressure and said vacuum to said pneumatic cylinder unit, said transmitting means including opposing coils and a pulse generator having an adjustable pulse duty factor, said coils being connected to push-pull outputs of said pulse generator, the alternative positions of said control valve being determined in accordance with said duty factor, said duty factor being applied to said opposing coils simultaneously; said three-way flow control valve further includes valve seats for said input conduits and a membrane-like, freely-movable ferromagnetic valve plate having non-magnetic surface layers cooperable with said valve seats; and means for adjusting said pulse duty factor in accordance with engine operating parameters.
Inventors
- 👤 Burkhard Brandner
- 👤 Bernhard Klein
- 👤 Albert Stubs
- 👤 Helmut Schilly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:52
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/06; F02M3/07; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
191 words
An idling control for an Otto engine, comprising: a throttle valve positioned in a suction pipe of an engine intake manifold; a pneumatic cylinder unit operably engaged with said throttle valve by means of a positioning leg; a three-way flow control valve in fluid communication with said pneumatic cylinder unit, said valve having respective input conduits for atmospheric pressure and vacuum, and having means for alternatively transmitting said atmospheric pressure and said vacuum to said pneumatic cylinder unit, at least one of said input conduits being in fluid communication with said pneumatic cylinder unit at all times, said transmitting means including opposing coils and pulse generator having an adjustable pulse duty factor, said coils being connected to push-pull outputs of said pulse generator, the alternative positions of said control valve being determined in accordance with said duty factor, said duty factor being applied to said opposing coils simultaneously; said three-way flow control valve further includes valve seats for said input conduits and a membrane-like, freely-movable ferromagnetic valve plate having non-magnetic surface layers cooperable with said valve seats; and means for adjusting said pulse duty factor in accordance with engine operating parameters.
Claim 2
Dependent Claim
191 words
An idling control for an Otto engine, comprising: a throttle valve positioned in a suction pipe of an engine intake manifold; a pneumatic cylinder unit operably engaged with said throttle valve by means of a positioning leg; a three-way flow control valve in fluid communication with said pneumatic cylinder unit, said valve having respective input conduits for atmospheric pressure and vacuum, and having means for alternatively transmitting said atmospheric pressure and said vacuum to said pneumatic cylinder unit, at least one of said input conduits being in fluid communication with said pneumatic cylinder unit at all times, said transmitting means including opposing coils and pulse generator having an adjustable pulse duty factor, said coils being connected to push-pull outputs of said pulse generator, the alternative positions of said control valve being determined in accordance with said duty factor, said duty factor being applied to said opposing coils simultaneously; said three-way flow control valve further includes valve seats for said input conduits and a membrane-like, freely-movable ferromagnetic valve plate having non-magnetic surface layers cooperable with said valve seats; and means for adjusting said pulse duty factor in accordance with engine operating parameters.
Claim 3
Dependent Claim
24 words
An idling control according to claim 1, wherein each pulse comprises a large switch current of short duration and a following small holding current.
Claim 4
Dependent Claim
46 words
An idling control according to claim 1, wherein said means for adjusting said pulse duty factor includes a comparing circuit for comparing a nominal speed with an actual speed of the engine, and delivering a shifting signal for the pulse duty factor to said pulse generator.
Claim 5
Dependent Claim
20 words
An idling control according to claim 3, further including a duty factor adjustment circuit for shifting said pulse duty factor.
Claim 6
Dependent Claim
20 words
An idling control according to claim 1, wherein said pneumatic cylinder unit includes a membrane valve and a restoring spring.
Claim 7
Dependent Claim
21 words
An idling control according to claim 3, including means for modifying said nominal speed as a function of engine operating parameters.
Claim 8
Dependent Claim
32 words
An idling control according to 6, wherein said modifying means includes a modifying circuit, said nominal speed being inputted to said circuit and a modified nominal speed being outputted by said circuit.
Claim 9
Dependent Claim
32 words
An idling control according to 6, wherein said modifying means includes a modifying circuit, said nominal speed being inputted to said circuit and a modified nominal speed being outputted by said circuit.
Claim 10
Dependent Claim
43 words
An idling control according to claim 7, further including a temperature feeler operatively connected to said modifying circuit, said temperature feeler sensing the temperature of said engine and causing said modifying circuit to increase said modified nominal speed when said engine is cold.
Claim 11
Dependent Claim
45 words
An idling control according to claim 7, further including delay means for increasing said nominal speed when the actual speed of said engine suddenly decreases, said delay means then gradually decreasing said increased nominal speed and thereby gradually decreasing said actual speed of said engine.
Claim 12
Dependent Claim
26 words
An idling control as claimed in claim 9, wherein said delay means includes a differentiating circuit which outputs an increased nominal speed to said modifying circuit.
Claim 13
Dependent Claim
26 words
An idling control as claimed in claim 10, wherein said increased nominal speed is calculated by said differentiating circuit directly from an actual engine speed signal.
Claim 14
Dependent Claim
43 words
An idling control as claimed in claim 11, wherein said delay means further includes a time function circuit connected to said differentiating circuit, said time function circuit delaying the output of said increased nominal speed from said differentiating circuit to said modifying circuit.
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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) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |