Patent US4639871A successfully refreshed from Google Patents.
US4639871A
Expired / Lapsed
US
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Glow plug heating control apparatus for a diesel engine
Assignee: Denso Corp
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Filing: 1984-02-02
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Granted: 1987-01-27
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Expires: 2004-02-02
Abstract
Abstract A control apparatus for diesel engines controls the energization of glow plugs each of which is disposed in a cylinder of a diesel engine and heated by an energizing current flowing therethrough. When fuel supply to the engine is resumed after the engine temperature has fallen due to the interruption of fuel supply during a decelerating operation of the engine and further when fuel supply is enriched during an accelerating operation of the engine while it is cold, the control apparatus controls the energization of the glow plugs, thereby promoting the combustion of the engine and improving the combustion efficiency of the engine.
Inventors
- 👤 Tuguyasu Sakai
- 👤 Hideaki Namba
- 👤 Masahiro Ohba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:51
CPC Classifications
F; F02; F02P; F02P19/00; F02P19/02; F02P19/025; F02B; F02B3/00; F02B3/06; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/12; F02D41/123; F02D41/126
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
147 words
A glow plug heating control apparatus for a diesel engine having at least one glow plug energized by an electric current before and after a starting operation of said diesel engine for heating the same, said control apparatus comprising: means for detecting a resumption of fuel supply to said diesel engine after a cut-off of fuel supply to said diesel engine during a decelerating operation, and producing a resumption output in response to said detected resumption; means for detecting an enrichment of fuel supply to said diesel engine during an accelerating operation of said diesel engine under a cold engine condition, and producing an enrichment output in response to said detected enrichment during acceleration; and means for energizing said glow plug whenever one of: (a) said fuel supply resumption detecting means produces said resumption output, and (b) said fuel supply enrichment detecting means produces said enrichment output.
Claim 2
Dependent Claim
147 words
A glow plug heating control apparatus for a diesel engine having at least one glow plug energized by an electric current before and after a starting operation of said diesel engine for heating the same, said control apparatus comprising: means for detecting a resumption of fuel supply to said diesel engine after a cut-off of fuel supply to said diesel engine during a decelerating operation, and producing a resumption output in response to said detected resumption; means for detecting an enrichment of fuel supply to said diesel engine during an accelerating operation of said diesel engine under a cold engine condition, and producing an enrichment output in response to said detected enrichment during acceleration; and means for energizing said glow plug whenever one of: (a) said fuel supply resumption detecting means produces said resumption output, and (b) said fuel supply enrichment detecting means produces said enrichment output.
Claim 3
Dependent Claim
69 words
A control system according to claim 1, wherein said energizing means includes: means for supplying said glow plug with a first electric current until the temperature of said glow plug reaches a predetermined value; and means for supplying said glow plug with a second electric current smaller than the first electric current during a predetermined time period after the temperature of said glow plug has reached the predetermined value.
Claim 4
Dependent Claim
123 words
A control system according to claim 1, wherein said energizing means includes: a battery; a first switch connected between said battery and said glow plug for supplying said glow plug with a first electric current therethrough until the temperature of said glow plug reaches a predetermined value; a second switch connected between said battery and said glow plug for supplying said glow plug with a second electric current therethrough during a predetermined time period after the temperature of said glow plug has reached the predetermined value; and a resistor connected in series with said second switch and comprised in an electric circuit for supplying the second electric current, for limiting the second electric current to a value smaller than the first electric current.
Claim 5
Dependent Claim
85 words
A glow plug heating control apparatus for a diesel engine which has at least one glow plug energized by an electric current before and after a starting operation of said diesel engine for heating the same, said control apparatus comprising: means for detecting a resumption of fuel supply to said diesel engine after a cut-off of fuel supply to said diesel engine during a deceleration operation; and means for energizing said glow plug in response to an output of said fuel supply resumption detecting means.
Claim 6
Dependent Claim
85 words
A glow plug heating control apparatus for a diesel engine which has at least one glow plug energized by an electric current before and after a starting operation of said diesel engine for heating the same, said control apparatus comprising: means for detecting a resumption of fuel supply to said diesel engine after a cut-off of fuel supply to said diesel engine during a deceleration operation; and means for energizing said glow plug in response to an output of said fuel supply resumption detecting means.
Claim 7
Dependent Claim
69 words
A control system according to claim 4, wherein said energizing means includes: means for supplying said glow plug with a first electric current until the temperature of said glow plug reaches a predetermined value; and means for supplying said glow plug with a second electric current smaller than the first electric current during a predetermined time period after the temperature of said glow plug has reached the predetermined value.
Claim 8
Dependent Claim
123 words
A control system according to claim 4, wherein said energizing means includes: a battery; a first switch connected between said battery and said glow plug for supplying said glow plug with a first electric current therethrough until the temperature of said glow plug reaches a predetermined value; a second switch connected between said battery and said glow plug for supplying said glow plug with a second electric current therethrough during a predetermined time period after the temperature of said glow plug has reached the predetermined value; and a resistor connected in series with said second switch and comprised in an electric circuit for supplying the second electric current, for limiting the second electric current to a value smaller than the first electric current.
Claim 9
Dependent Claim
80 words
A glow plug heating control apparatus for a diesel engine which has at least one glow plug energized by an electric current before and after a starting operation of said diesel engine for heating the same, said control apparatus comprising: means for detecting an enrichment of fuel supply to said diesel engine during an accelerating operation under a cold engine condition; and means for energizing said glow plug in response to an output of said fuel supply enrichment detecting means.
Claim 10
Dependent Claim
80 words
A glow plug heating control apparatus for a diesel engine which has at least one glow plug energized by an electric current before and after a starting operation of said diesel engine for heating the same, said control apparatus comprising: means for detecting an enrichment of fuel supply to said diesel engine during an accelerating operation under a cold engine condition; and means for energizing said glow plug in response to an output of said fuel supply enrichment detecting means.
Claim 11
Dependent Claim
69 words
A control system according to claim 7, wherein said energizing means includes: means for supplying said glow plug with a first electric current until the temperature of said glow plug reaches a predetermined value; and means for supplying said glow plug with a second electric current smaller than the first electric current during a predetermined time period after the temperature of said glow plug has reached the predetermined value.
Claim 12
Dependent Claim
123 words
A control system according to claim 7, wherein said energizing means includes: a battery; a first switch connected between said battery and said glow plug for supplying said glow plug with a first electric current therethrough until the temperature of said glow plug reaches a predetermined value; a second switch connected between said battery and said glow plug for supplying said glow plug with a second electric current therethrough during a predetermined time period after the temperature of said glow plug has reached the predetermined value; and a resistor connected in series with said second switch and comprised in an electric circuit for supplying the second electric current, for limiting the second electric current to a value smaller than the first electric current.
References Cited (Backward Citations)
US3735742A
Cited
US4148283A
Cited
JPS545143A
Cited
DE2743788A1
Cited
JPS5639868A
Cited
US4399781A
Cited
US4350876A
Cited
JPS57113969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |