Fuel-operated vehicle heater and method for operating a fuel-operated vehicle heater
US-2019375273-A1 · Dec 12, 2019 · US
Fuel-operated vehicle heating device and method to operating a fuel-operated vehicle heating device
US11148504B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11148504-B2 |
| Application number | US-201716464373-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 22, 2017 |
| Priority date | Nov 29, 2016 |
| Publication date | Oct 19, 2021 |
| Grant date | Oct 19, 2021 |
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- Title
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Abstract
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A method to operate a fuel-operated vehicle heater comprising the lowering of a combustion air ratio λ between supplied combustion air and supplied fuel to a combustion chamber of the fuel-operated vehicle heater from a starting value λstart>1 to a range λ<λstart for a time period Δt.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method to operate a fuel-operated vehicle heater comprising the lowering of a combustion air ratio λ between supplied combustion air and supplied fuel to a combustion chamber of the fuel-operated vehicle heater from a starting value λ start >1 to a range λ<λ start start for a time period Δt, wherein the lowering of the combustion air ratio λ starts during stable steady-state operation of the fuel-operated vehicle heater, wherein the combustion air ratio λ is returned to a final value range of the combustion air ratio with λ>1 subsequent to the time interval Δt, and wherein the lowering of the combustion air ratio λ to the range λ<λ start is initiated based on an operating time of the vehicle heater since the last lowering and/or is terminated based on an air pressure detected by a sensor. 2. The method according to claim 1 , wherein the combustion air ratio λ is maintained in a constant value range in the range λ<λ start during the time interval Δt. 3. The method according to claim 1 , wherein the combustion air ratio λ is returned to a final value range of the combustion air ratio with λ>1 subsequent to the time interval Δt. 4. The method according to claim 1 , wherein the length of the time interval Δt is between 2 minutes and 5 minutes. 5. The method according to claim 1 , wherein an amount of combustion air supplied to the combustion air chamber is reduced and/or an amount of fuel supplied to the combustion air chamber is increased. 6. The method according to claim 5 , wherein the amount of combustion air supplied to the combustion chamber and/or the amount of fuel supplied to the combustion chamber being determined depending on an air pressure detected by a sensor. 7. The method according to claim 1 , wherein the lowering of the combustion air ratio λ to the range λ<λ start is initiated based on an operating time of the vehicle heater since the last lowering and/or terminated based on an air pressure detected by the sensor. 8. A fuel-operated vehicle heater having a control unit configured to perform the method according to claim 1 .
Assignees
Inventors
Classifications
- F23N5/20Primary
with a time program acting through electrical means, e.g. using time-delay relays · CPC title
Regulating fuel supply · CPC title
Fuel supply · CPC title
Vehicle heating, the heat being derived otherwise than from the propulsion plant · CPC title
for determining flow · CPC title
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- What does patent US11148504B2 cover?
- A method to operate a fuel-operated vehicle heater comprising the lowering of a combustion air ratio λ between supplied combustion air and supplied fuel to a combustion chamber of the fuel-operated vehicle heater from a starting value λstart>1 to a range λ<λstart for a time period Δt.
- Who is the assignee on this patent?
- Webasto SE
- What technology area does this patent fall under?
- Primary CPC classification F23N5/20. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Oct 19 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).