US5054459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preheating device for internal combustion engine intake air and method of making same
Assignee: Daimler Benz AG
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Filing: 1990-05-29
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Granted: 1991-10-08
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Expires: 2010-05-29
Abstract
Abstract A device is described for electrically pre-heating the intake air or the intake mixture of an internal combustion engine having at least on intake pipe. So that low-loss pre-heating, without considerable impairment of flow in the intake pipe, can also be realized in such zones in which the intake pipe has a geometrically irregular shape. It is proposed to perform the pre-heating via a layer of high electrical resistance applied to the inner surface of the intake pipe.
Inventors
- 👤 Uwe Reimer
- 👤 Jurgen Kretschmer
- 👤 Klaus Brecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:00
CPC Classifications
F; F02; F02N; F02N19/00; F02N19/02; F02N19/04; F02N19/06; F02N19/08; F02M; F02M31/00; F02M31/02; F02M31/12; F02M31/13; F02M31/135; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
92 words
Intake apparatus for an internal combustion engine comprising: at least one intake pipe for conveying intake gases to an internal combustion engine, and an electrical resistance heating device for heating the intake gases as they are conveyed in the intake pipe, wherein said heating device includes a malleable layer of carbon fibers laminated to an inwardly facing surface of the intake pipe and an electric current supply circuit for supplying current to the carbon fibers, whereby said heating device is adapted to be applied to irregularly shaped intake pipe inwardly facing surfaces.
Claim 2
Dependent Claim
92 words
Intake apparatus for an internal combustion engine comprising: at least one intake pipe for conveying intake gases to an internal combustion engine, and an electrical resistance heating device for heating the intake gases as they are conveyed in the intake pipe, wherein said heating device includes a malleable layer of carbon fibers laminated to an inwardly facing surface of the intake pipe and an electric current supply circuit for supplying current to the carbon fibers, whereby said heating device is adapted to be applied to irregularly shaped intake pipe inwardly facing surfaces.
Claim 3
Dependent Claim
34 words
Apparatus according to claim 1, wherein two of said intake pipes are provided which are made together of a carbon-fiber-reinforced plastic, each of said intake pipes including one of said electrical resistance heating devices.
Claim 4
Dependent Claim
26 words
Apparatus according to claim 1, wherein said malleable layer extends over only a portion of the circumference of the inwardly facing surface of the intake pipe.
Claim 5
Dependent Claim
34 words
Apparatus according to claim 3, wherein two of said intake pipes are provided which are made together of a carbon-fiber-reinforced plastic, each of said intake pipes including one of said electrical resistance heating devices.
Claim 6
Dependent Claim
28 words
Apparatus according to claim 4, wherein said electrical circuits include sensors for sensing the temperature of the intake pipe and for sensing the temperature of the malleable layer.
Claim 7
Dependent Claim
13 words
Apparatus according to claim 3, wherein the layer is formed as a fabric.
Claim 8
Dependent Claim
23 words
Apparatus according to claim 6, wherein a heat insulating intermediate layer is provided between the fabric and the intake pipe inwardly facing surface.
Claim 9
Dependent Claim
23 words
Apparatus according to claim 6, wherein the intake pipe is made of an electrically non-conducting material in the zone of the applied fabric.
Claim 10
Dependent Claim
23 words
Apparatus according to claim 8, wherein a heat insulating intermediate layer is provided between the fabric and the intake pipe inwardly facing surface.
Claim 11
Dependent Claim
16 words
Apparatus according to claim 6, wherein the layer is laminated in place by a bonding agent.
Claim 12
Dependent Claim
23 words
Apparatus according to claim 10, wherein the intake pipe is made of an electrically non-conducting material in the zone of the applied fabric.
Claim 13
Dependent Claim
23 words
Apparatus according to claim 10, wherein a heat insulating intermediate layer is provided between the fabric and the intake pipe inwardly facing surface.
Claim 14
Dependent Claim
23 words
Apparatus according to claim 10, wherein the bonding agent is an epoxy resin with a temperature stability of up to about 200° C.
Claim 15
Dependent Claim
23 words
Apparatus according to claim 13, wherein the intake pipe is made of an electrically non-conducting material in the zone of the applied fabric.
Claim 16
Dependent Claim
23 words
Apparatus according to claim 13, wherein a heat insulating intermediate layer is provided between the fabric and the intake pipe inwardly facing surface.
Claim 17
Independent Claim
88 words
A method of making apparatus for preheating intake gases in an intake pipe for an internal combustion engine, comprising: laminating a malleable layer of carbon fibers to an inwardly facing surface of an intake pipe such that said malleable layer extends over only a portion of the circumference of the inwardly facing surface of the intake pipe, whereby said malleable layer is adapted to be applied to irregularly shaped intake pipe inwardly facing surfaces, and connecting an electric current supply circuit for supplying current to the carbon fibers.
Claim 18
Independent Claim
88 words
A method of making apparatus for preheating intake gases in an intake pipe for an internal combustion engine, comprising: laminating a malleable layer of carbon fibers to an inwardly facing surface of an intake pipe such that said malleable layer extends over only a portion of the circumference of the inwardly facing surface of the intake pipe, whereby said malleable layer is adapted to be applied to irregularly shaped intake pipe inwardly facing surfaces, and connecting an electric current supply circuit for supplying current to the carbon fibers.
Claim 19
Dependent Claim
23 words
A method according to claim 16, wherein a heat insulating intermediate layer is provided between the fabric layer and the intake pipe surface.
Claim 20
Dependent Claim
28 words
A method according to claim 16, wherein the at least one intake pipe is made of an electrically non-conducting material in the zone of the applied fabric layer.
Claim 21
Dependent Claim
22 words
A method according to claim 18, wherein a heat insulating layer is provided between the fabric layer and the intake pipe surface.
Claim 22
Dependent Claim
15 words
A method according to claim 16, wherein the layer is formed as a fabric layer.
Claim 23
Dependent Claim
26 words
A method according to claim 20, wherein the fabric layer is laminated to the inner surface of the intake pipe by means of a bonding agent.
Claim 24
Dependent Claim
24 words
A method according to claim 21, wherein the bonding agent is an epoxy resin with a temperature stability of up to about 200° C.
Claim 25
Dependent Claim
28 words
A method according to claim 22, wherein the at least one intake pipe is made of an electrically non-conducting material in the zone of the applied fabric layer.
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) | 1994-10-07 | 1995-04-08 | 1995-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-07 | 1999-04-08 | 1999-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-07 | 2003-04-08 | 2003-10-08 | $7700.00 | Window Closed / Lapsed |