US4182295A
Expired / Lapsed
US
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Method and apparatus for engine fuel control
Assignee: Robert Bosch GmbH
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Filing: 1978-10-24
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Granted: 1980-01-08
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Expires: 1998-10-24
Abstract
Abstract A fuel supply mechanism for an internal combustion engine includes a fuel-air mixture generator and an air bypass channel for conducting supplementary air to the mixture prior to delivery to the cylinders. The bypass channel has a valve which is coupled to the main throttle valve in the induction manifold. The coupling may be entirely mechanical or electro-mechanical. In addition, a controller which acts on the basis of engine information changes the degree of coupling between the main throttle and the bypass valve to admit more or less supplementary air, depending on the value of engine variables.
Inventors
- 👤 Hans Zeller
- 👤 Reinhard Latsch
- 👤 Johannes Brettschneider
- 👤 Valerio Bianchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:36
CPC Classifications
F; F02; F02M; F02M23/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
67 words
A method for controlling the fuel-air mixture of an internal combustion engine comprising the steps of: generating a fuel air mixture; admitting quantities of said fuel-air mixture to said engine by throttle means; admitting quantities of additional air to said fuel-air mixture in dependence on the state of said throttle means; and changing the magnitude of said dependence on the basis of information regarding engine operating variables.
Claim 2
Independent Claim
67 words
A method for controlling the fuel-air mixture of an internal combustion engine comprising the steps of: generating a fuel air mixture; admitting quantities of said fuel-air mixture to said engine by throttle means; admitting quantities of additional air to said fuel-air mixture in dependence on the state of said throttle means; and changing the magnitude of said dependence on the basis of information regarding engine operating variables.
Claim 3
Independent Claim
162 words
An apparatus for the closed loop control of the fuel-air mixture of an internal combustion engine, said engine including an air intake tube, fuel-air mixture generator means, an induction manifold and a main throttle in said induction manifold, comprising: a bypass conduit leading directly to said induction manifold, bypassing said generator means; a bypass valve disposed within said bypass conduit for controlling the air flow therethrough; means for sensing motion of the main throttle and effecting a corresponding motion transfer of said bypass valve; and means for changing the degree of motion transfer exerted by said means for sensing, on the basis of engine parameters which vary as the fuel-air mixture composition varies, wherein the transmission ratio as between the position of the main throttle and the bypass valve may be changed in the range from 0 to 1, independently of the position of the main throttle and with a changing rate over said range which is independent of said engine parameters.
Claim 4
Independent Claim
162 words
An apparatus for the closed loop control of the fuel-air mixture of an internal combustion engine, said engine including an air intake tube, fuel-air mixture generator means, an induction manifold and a main throttle in said induction manifold, comprising: a bypass conduit leading directly to said induction manifold, bypassing said generator means; a bypass valve disposed within said bypass conduit for controlling the air flow therethrough; means for sensing motion of the main throttle and effecting a corresponding motion transfer of said bypass valve; and means for changing the degree of motion transfer exerted by said means for sensing, on the basis of engine parameters which vary as the fuel-air mixture composition varies, wherein the transmission ratio as between the position of the main throttle and the bypass valve may be changed in the range from 0 to 1, independently of the position of the main throttle and with a changing rate over said range which is independent of said engine parameters.
Claim 5
Dependent Claim
82 words
An apparatus as defined by claim 2, wherein said bypass valve is a throttling flap coupled to said main throttle by a linkage including a slotted lever 27 pivotable at one end, said pivotable end being displaceable by a control element actuated by a controller, the other end of said slotted lever being attached to a rod connected with said bypass throttle flap, the slot in said slotted lever guiding a sliding block attached to an actuating lever on said main throttle.
Claim 6
Dependent Claim
15 words
An apparatus as defined by claim 3, wherein said control element is a solenoid element.
Claim 7
Dependent Claim
16 words
An apparatus as defined by claim 3, wherein said control element is a heatable bimetallic spring.
Claim 8
Dependent Claim
36 words
An apparatus as defined by claim 3, wherein said control element is a threaded shaft driven by an electric motor carrying a threaded block which is pivotably connected with said pivotable point on said slotted lever.
Claim 9
Independent Claim
184 words
An apparatus for controlling the fuel-air mixture of an internal combustion engine, said engine including an air intake tube, fuel-air mixture generator means, an induction manifold and a main throttle in said induction manifold, comprising: a bypass conduit leading directly to said induction manifold, bypassing said generator means; a throttle flap bypass valve disposed within said bypass conduit for controlling the air flow therethrough; means for sensing motion of the main throttle and effecting a corresponding motion of said bypass valve, said means for sensing coupling said throttle flap to said main throttle and including a parallelogram linkage which includes a locally fixed and pivoting lever and a connecting rod coupled to said locally fixed lever and the actuating lever on said bypass throttle flap, and further including a sliding bushing sliding on said rod pivotably attached to a block that engages a lever connected to the main throttle, said block being displaceable by a fuel metering controller between two terminal positions; and means for changing the degree of motion transfer exerted by said means for sensing, on the basis of engine operating variables.
Claim 10
Independent Claim
184 words
An apparatus for controlling the fuel-air mixture of an internal combustion engine, said engine including an air intake tube, fuel-air mixture generator means, an induction manifold and a main throttle in said induction manifold, comprising: a bypass conduit leading directly to said induction manifold, bypassing said generator means; a throttle flap bypass valve disposed within said bypass conduit for controlling the air flow therethrough; means for sensing motion of the main throttle and effecting a corresponding motion of said bypass valve, said means for sensing coupling said throttle flap to said main throttle and including a parallelogram linkage which includes a locally fixed and pivoting lever and a connecting rod coupled to said locally fixed lever and the actuating lever on said bypass throttle flap, and further including a sliding bushing sliding on said rod pivotably attached to a block that engages a lever connected to the main throttle, said block being displaceable by a fuel metering controller between two terminal positions; and means for changing the degree of motion transfer exerted by said means for sensing, on the basis of engine operating variables.
Claim 11
Dependent Claim
26 words
An apparatus as defined by claim 7, wherein said block is a threaded block and said lever is a threaded shaft driven by an electric motor.
Claim 12
Dependent Claim
40 words
An apparatus as defined by claim 8, wherein said electric motor is locally fixed and the shaft of said electric motor is coaxial with the shaft of said main throttle and further including bevel gears for driving said threaded shaft.
Claim 13
Dependent Claim
25 words
An apparatus as defined by claim 9, wherein said electric motor may be turned on and off via limiting switches actuated by said threaded block.
Claim 14
Dependent Claim
19 words
An apparatus as defined by claim 7, wherein said threaded block may be displaced by a heatable bimetallic spring.
Claim 15
Dependent Claim
16 words
An apparatus as defined by claim 7, wherein said block may be displaced by a solenoid.
Claim 16
Dependent Claim
74 words
An apparatus as defined by claim 2, further including potentiometer means attached to said main throttle and serving to generate a signal related to the position of said main throttle, said bypass conduit including solenoid-actuated valve means controlled by said signal from said potentiometer means, the voltage across said potentiometer being supplied by engine controller means, said apparatus further including comparator means for comparing the signal from said potentiometer means with a reference signal.
Claim 17
Dependent Claim
17 words
An apparatus as defined by claim 13, wherein said bypass valve means is a solenoid-actuated proportional valve.
Claim 18
Dependent Claim
26 words
An apparatus as defined by claim 14, wherein the output signal from said potentiometer means is changeable by energizing electrical contacts attached to the potentiometer track.
Claim 19
Dependent Claim
23 words
An apparatus as defined in claim 7, wherein the bypass conduit is connected to said air intake tube upstream of said generator means.
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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) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |