US6571765B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for engine
Assignee: Denso Corp
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Filing: 2002-10-02
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Granted: 2003-06-03
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Expires: 2022-10-02
Abstract
Abstract The engine control system has an ECU that supplies relatively large amount of EGR gas and delays an injection timing in order to decrease temperature in a combustion chamber. When an engine is operated under a warming up operation or a low engine load, the ECU deactivates an EGR cooler to increase intake air temperature in order to stabilize engine operation. When the engine is operated under a high engine load, the ECU activates the EGR cooler, delays a closing timing of an intake valve, and increases a boost pressure of a forced induction system. As a result, both of a compression end temperature and a maximum combustion temperature are decreased so that emissions of NOx and particulates are reduced.
Inventors
- 👤 Tsukasa Kuboshima
- 👤 Kiyonori Sekiguchi
- 👤 Masumi Kinugawa
- 👤 Makoto Saito
- 👤 Shigeto Yahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:09
CPC Classifications
F; F02; F02D; F02D35/00; F02D35/02; F02D35/025; F02D15/00; F02D41/00; F02D41/0025; F02D41/0047; F02D41/0065; F02D41/02; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1446; F02D41/30; F02D41/38; F02D41/40; F02D41/401; F02M; F02M26/00; F02M26/13; F02M26/22; F02M26/23; F02M26/28; F02B; F02B29/00; F02B29/04; F02B29/0406; F02D2041/0067; F02D2250/00; F02D2250/36; F02D41/04; F02D41/08; F02D41/086; F02M26/02; F02M26/04; F02M26/05; F02M26/09; F02M26/10; F02M26/33; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
76 words
A control system for an engine, the system comprising: engine load determining means for determining engine load; compression ratio decreasing means for decreasing an actual compression ratio from a theoretical compression ratio when the engine load is higher than a predetermined level; and intake air increasing means for increasing an amount of intake air induced into a combustion chamber of the engine when the actual compression ratio is decreased by the actual compression ratio decreasing means.
Claim 2
Dependent Claim
76 words
A control system for an engine, the system comprising: engine load determining means for determining engine load; compression ratio decreasing means for decreasing an actual compression ratio from a theoretical compression ratio when the engine load is higher than a predetermined level; and intake air increasing means for increasing an amount of intake air induced into a combustion chamber of the engine when the actual compression ratio is decreased by the actual compression ratio decreasing means.
Claim 3
Dependent Claim
72 words
The control system for an engine according to claim 1 , wherein the engine has a variable intake valve timing device and a forced induction device, the actual compression ratio decreasing means delays a closing timing of an intake valve of the engine by controlling the variable intake valve timing device, and the intake air increasing means increases a boost pressure of the forced induction device by controlling the forced induction device.
Claim 4
Dependent Claim
29 words
The control system for an engine according to claim 1 , wherein the engine load determining means includes a sensor for detecting an operated position of an accelerator pedal.
Claim 5
Dependent Claim
27 words
The control system for an engine according to claim 1 , wherein the engine has a fuel injection system for injecting fuel directly into the combustion chamber.
Claim 6
Dependent Claim
39 words
The control system for an engine according to claim 4 , further comprising: delayed injection means for injecting fuel into the combustion chamber at a relatively delayed timing when the engine load is in a low engine load range.
Claim 7
Dependent Claim
39 words
The control system for an engine according to claim 1 , further comprising: delayed ignition means for igniting fuel in the combustion chamber at a relatively delayed timing when the engine load is in a low engine load range.
Claim 8
Dependent Claim
20 words
The control system for an engine according to claim 1 , further comprising: EGR means for executing an exhaust-gas recirculation.
Claim 9
Dependent Claim
58 words
The control system for an engine according to claim 7 , further comprising an EGR cooler for cooling an EGR gas, and EGR cooler control means for activating the EGR cooler when the engine load is higher than the predetermined level, and for deactivating the EGR cooler when the engine load is in a low engine load range.
Claim 10
Dependent Claim
31 words
The control system for an engine according to claim 1 , further comprising: intake air temperature control means for decreasing temperature of the intake air as the engine load is increased.
Claim 11
Dependent Claim
39 words
The control system for an engine according to claim 1 , further comprising: warming up control means for inhibiting the compression ratio decreasing means and the intake air increasing means when the engine is in a warming up operation.
Claim 12
Dependent Claim
137 words
The control system for an engine according to claim 1 , wherein the engine has a variable intake valve timing device and a forced induction device, the engine load determining means includes means for detecting an operated position of an accelerator pedal, and determines whether the engine load is in a low engine load range, a medium engine load range or a high engine load range corresponding to a range higher than the predetermined level, the actual compression ratio decreasing means delays a closing timing of an intake valve of the engine by controlling the variable intake valve timing device, and the intake air increasing means increases a boost pressure of the forced induction device by controlling the forced induction device, the increased boost pressure being higher than that set before the actual compression ratio is decreased.
Claim 13
Dependent Claim
97 words
The control system for an engine according to claim 11 , further comprising: EGR device that returns a part of exhaust gas to an intake side of the engine; EGR cooler that cools the exhaust gas returning to the intake side via the EGR device; temperature detecting means for detecting temperature of cooling water for cooling the engine; and EGR cooler controlling means for controlling the EGR cooler in an activated condition or a deactivated condition based on the temperature detected by the temperature detecting means and the engine load determined by the engine load determining means.
Claim 14
Dependent Claim
42 words
The control system for an engine according to claim 12 , wherein the EGR cooler controlling means deactivates the EGR cooler when the engine load is in the low engine load range or when the temperature is lower than a predetermined temperature.
Claim 15
Dependent Claim
34 words
The control system for an engine according to claim 12 , wherein the EGR cooler controlling means activates the EGR cooler when the engine load is in the medium or high engine load range.
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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) | 2006-06-02 | 2006-12-02 | 2007-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-06-02 | 2010-12-02 | 2011-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-06-02 | 2014-12-02 | 2015-06-03 | $7700.00 | Window Closed / Lapsed |