Control apparatus for internal combustion engine
US-2017058855-A1 · Mar 2, 2017 · US
Method and system for ignition coil control
US10138862B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10138862-B2 |
| Application number | US-201615359395-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 22, 2016 |
| Priority date | Nov 22, 2016 |
| Publication date | Nov 27, 2018 |
| Grant date | Nov 27, 2018 |
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- Title
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Abstract
Official abstract text for this publication.
Methods and systems are provided for determining an ignition coil dwell time based on an estimated ignition coil temperature. In one example, a method may include estimating the ignition coil temperature based on heat transfer between engine and the ignition coil, heat transfer between ambient and the ignition coil, and internal resistive heating of the ignition coil.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method comprising: iteratively estimating an ignition coil temperature; updating the iteratively estimated ignition coil temperature based on each and every one of heat transfer from an engine to an ignition coil, internal resistive heating of the ignition coil, and heat transfer from ambient to the ignition coil; and charging the ignition coil for a dwell time determined based on the updated iteratively estimated ignition coil temperature. 2. The method of claim 1 , wherein the internal resistive heating of the ignition coil is estimated based on a most recently determined dwell time, an averaged dwell period current, and a primary coil resistance. 3. The method of claim 1 , further comprising determining an initial ignition coil temperature based on each and every one of an engine temperature and an ambient temperature in response to a key-on event. 4. The method of claim 1 , further comprising stopping updating the ignition coil temperature in response to a key-off event. 5. The method of claim 1 , further comprising updating the ignition coil temperature at a constant frequency independent from an engine firing frequency. 6. The method of claim 1 , wherein the heat transfer from the engine to the ignition coil is estimated based on an engine temperature and a most recently updated ignition coil temperature. 7. The method of claim 1 , wherein the heat transfer from ambient to the ignition coil is estimated based on an ambient temperature and a most recently updated ignition coil temperature. 8. The method of claim 1 , wherein the ignition coil temperature is further based on an averaged dwell period current of the ignition coil. 9. The method of claim 1 , further comprising updating the iteratively estimated ignition coil temperature at a frequency determined based on a thermal time constant of the ignition coil. 10. The method of claim 1 , further comprising updating the iteratively estimated ignition coil temperature based on a vehicle speed. 11. The method of claim 1 , further comprising updating the iteratively estimated ignition coil temperature via weighting a change rate of the ignition coil temperature with a time duration from a most recent update of the iteratively estimated ignition coil temperature. 12. The method of claim 1 , further comprising determining the dwell time based on a battery voltage. 13. The method of claim 1 , further comprising determining the dwell time based on a vehicle speed.
Assignees
Inventors
Classifications
- F02P3/045Primary
for control of the dwell or anti dwell time · CPC title
using digital techniques · CPC title
- F02P9/00Primary
Electric spark ignition control, not otherwise provided for · CPC title
Measuring dwell or antidwell time · CPC title
Control of spark intensity, intensifying, lengthening, suppression (by means of current control in the storage devices F02P3/05, F02P3/09, during starting F02P15/12) · CPC title
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Frequently asked questions
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- What does patent US10138862B2 cover?
- Methods and systems are provided for determining an ignition coil dwell time based on an estimated ignition coil temperature. In one example, a method may include estimating the ignition coil temperature based on heat transfer between engine and the ignition coil, heat transfer between ambient and the ignition coil, and internal resistive heating of the ignition coil.
- Who is the assignee on this patent?
- Ford Global Tech Llc
- What technology area does this patent fall under?
- Primary CPC classification F02P3/045. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Nov 27 2018 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).