US5152273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation control device and its failure diagnosis device
Assignee: Mitsubishi Electric Corp
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Filing: 1991-10-17
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Granted: 1992-10-06
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Expires: 2011-10-17
Abstract
Abstract An exhaust gas recirculation control device adapted to control a recirculation of part of exhaust gas of an internal combustion engine back to the engine which comprises a recirculation pipe for recirculating the exhaust gas of the internal combustion engine back to an intake air pipe; a recirculation valve for controlling a flow quantity of the exhaust gas flowing in the recirculation pipe; a recirculation valve passage area controlling means for controlling a passage area of the recirculation valve; a running condition detecting means for detecting a running condition of the internal combustion engine; a pressure difference detecting means for detecting a pressure difference between pressures at two arbitrary points in the recirculation pipe from an exit of the recirculation valve to the intake air pipe or a pressure difference between pressures at two arbitrary points in the recirculation pipe from an inlet of the recirculation valve to an exhaust pipe; a first exhaust gas recirculation ratio calculating means for calculating a first exhaust gas recirculation ratio from the pressure difference and a detected value of the running condition detecting means; and a second exhaust gas recirculation ratio calculating means for calculating a second exhaust gas recirculation ratio corresponding with the detected value of the running condition detecting means; wherein a feed back control is performed in which the passage area of the recirculation valve is increased or decreased so that a difference between the first exhaust gas recirculation ratio and a second exhaust gas recirculation ratio is nullified.
Inventors
- 👤 Hirofumi Ohuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:19
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/10; G01M15/102; F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/22; F02D41/221; F02M; F02M26/00; F02M26/45; F02M26/46; F02M26/47; F02M26/49; F02M26/52; F02M26/55; F02M26/56; F02M26/57; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
252 words
An exhaust gas recirculation control device adapted to control a recirculation of a part of exhaust gas of an internal combustion engine back to the internal combustion engine which comprises: a recirculation pipe for recirculating the exhaust gas of the internal combustion engine back to an intake air pipe; a recirculation valve for controlling a flow quantity of the exhaust gas flowing in the recirculation pipe; a recirculation valve passage area controlling means for controlling a passage area of the recirculation valve; a running condition detecting means for detecting a running condition of the internal combustion engine; a pressure difference detecting means for detecting a pressure difference between pressures at two arbitrary points in the recirculation pipe from an exit of the recirculation valve to the intake air pipe or a pressure difference between pressures at two arbitrary points in the recirculation pipe from an inlet of the recirculation valve to an exhaust pipe; a first exhaust gas recirculation ratio calculating means for calculating a first exhaust gas recirculation ratio from the pressure difference and a detected value of the running condition detecting means; and a second exhaust gas recirculation ratio calculating means for calculating a second exhaust gas recirculation ratio corresponding with the detected value of the running condition detecting means; wherein a feed back control is performed in which the passage area of the recirculation valve is increased or decreased so that a difference between the first exhaust gas recirculation ratio and the second exhaust gas recirculation ratio is nullified.
Claim 2
Dependent Claim
252 words
An exhaust gas recirculation control device adapted to control a recirculation of a part of exhaust gas of an internal combustion engine back to the internal combustion engine which comprises: a recirculation pipe for recirculating the exhaust gas of the internal combustion engine back to an intake air pipe; a recirculation valve for controlling a flow quantity of the exhaust gas flowing in the recirculation pipe; a recirculation valve passage area controlling means for controlling a passage area of the recirculation valve; a running condition detecting means for detecting a running condition of the internal combustion engine; a pressure difference detecting means for detecting a pressure difference between pressures at two arbitrary points in the recirculation pipe from an exit of the recirculation valve to the intake air pipe or a pressure difference between pressures at two arbitrary points in the recirculation pipe from an inlet of the recirculation valve to an exhaust pipe; a first exhaust gas recirculation ratio calculating means for calculating a first exhaust gas recirculation ratio from the pressure difference and a detected value of the running condition detecting means; and a second exhaust gas recirculation ratio calculating means for calculating a second exhaust gas recirculation ratio corresponding with the detected value of the running condition detecting means; wherein a feed back control is performed in which the passage area of the recirculation valve is increased or decreased so that a difference between the first exhaust gas recirculation ratio and the second exhaust gas recirculation ratio is nullified.
Claim 3
Dependent Claim
32 words
The exhaust gas recirculation control device of claim 1, wherein the pressure difference is a difference between pressure values of the intake air pipe and at the exit of the recirculation valve.
Claim 4
Dependent Claim
35 words
The exhaust gas recirculation control device of claim 1, further comprising a memory means for memorizing the difference between the first and the second exhaust gas recirculation ratios, or a value corresponding with the difference.
Claim 5
Dependent Claim
40 words
The exhaust gas recirculation control device of claim 1, further comprising a failure diagnosis means for diagnosing a failure of the exhaust gas recirculation control device by detecting a disagreement between the first and the second exhaust gas recirculation ratios.
Claim 6
Dependent Claim
206 words
A failure diagnosis device of an exhaust gas recirculation device adapted to control a recirculation of a part of exhaust gas of an internal combustion engine back to the internal combustion engine which comprises: a recirculation pipe for recirculating the exhaust gas of the internal combustion engine back to an intake air pipe; a recirculation valve for controlling a flow quantity of the exhaust gas flowing in the recirculation pipe; a recirculation valve passage area controlling means for controlling a passage area of the recirculation valve; a running condition detecting means for detecting a running condition of the internal combustion engine; a pressure detecting means for detecting a pressure at an exit of the recirculation valve; a pressure difference detecting and correcting means for detecting a pressure difference between an intake air pipe pressure detected by the running condition detecting means and the pressure at the exit of the recirculation valve, and correcting the pressure difference based on the intake air pipe pressure; a determining means for determining whether a corrected value of the pressure difference is in a predetermined range; and an alarming means for alarming when the determining means determines that the corrected value of the pressure difference is out of the predetermined range.
Claim 7
Dependent Claim
206 words
A failure diagnosis device of an exhaust gas recirculation device adapted to control a recirculation of a part of exhaust gas of an internal combustion engine back to the internal combustion engine which comprises: a recirculation pipe for recirculating the exhaust gas of the internal combustion engine back to an intake air pipe; a recirculation valve for controlling a flow quantity of the exhaust gas flowing in the recirculation pipe; a recirculation valve passage area controlling means for controlling a passage area of the recirculation valve; a running condition detecting means for detecting a running condition of the internal combustion engine; a pressure detecting means for detecting a pressure at an exit of the recirculation valve; a pressure difference detecting and correcting means for detecting a pressure difference between an intake air pipe pressure detected by the running condition detecting means and the pressure at the exit of the recirculation valve, and correcting the pressure difference based on the intake air pipe pressure; a determining means for determining whether a corrected value of the pressure difference is in a predetermined range; and an alarming means for alarming when the determining means determines that the corrected value of the pressure difference is out of the predetermined range.
Claim 8
Dependent Claim
233 words
A failure diagnosis device of an exhaust gas recirculation device adapted to control a recirculation of a part of exhaust gas of an internal combustion engine back to the internal combustion engine which comprises: a recirculation pipe for recirculating the exhaust gas of the internal combustion engine back to an intake air pipe; a recirculation valve for controlling a flow quantity of the exhaust gas flowing in the recirculation pipe; a recirculation valve passage area controlling means for controlling a passage area of the recirculation valve; a running condition detecting means for detecting a running condition of the internal combustion engine; a pressure detecting means for detecting a pressure at an exit of the recirculation valve; a pressure difference detecting and correcting means for detecting a pressure difference between an intake air pipe pressure detected by the running condition detecting means and the pressure at the exit of the recirculation valve, and correcting the pressure difference by a value of a function of a measured value of an intake air quantity for the internal combustion engine or a revolution number of the internal combustion engine and a throttle opening degree; a determining means for determining whether a corrected value of the pressure difference is in a predetermined range; and an alarming means for alarming when the determining means determines that the corrected value of the pressure difference is out of the predetermined range.
Claim 9
Dependent Claim
233 words
A failure diagnosis device of an exhaust gas recirculation device adapted to control a recirculation of a part of exhaust gas of an internal combustion engine back to the internal combustion engine which comprises: a recirculation pipe for recirculating the exhaust gas of the internal combustion engine back to an intake air pipe; a recirculation valve for controlling a flow quantity of the exhaust gas flowing in the recirculation pipe; a recirculation valve passage area controlling means for controlling a passage area of the recirculation valve; a running condition detecting means for detecting a running condition of the internal combustion engine; a pressure detecting means for detecting a pressure at an exit of the recirculation valve; a pressure difference detecting and correcting means for detecting a pressure difference between an intake air pipe pressure detected by the running condition detecting means and the pressure at the exit of the recirculation valve, and correcting the pressure difference by a value of a function of a measured value of an intake air quantity for the internal combustion engine or a revolution number of the internal combustion engine and a throttle opening degree; a determining means for determining whether a corrected value of the pressure difference is in a predetermined range; and an alarming means for alarming when the determining means determines that the corrected value of the pressure difference is out of the predetermined 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) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |