Patent US4417285A successfully refreshed from Google Patents.
Patent US4903526A successfully refreshed from Google Patents.
US4903526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trouble detector system for an intake system of an automotive engine
Assignee: Subaru Corp
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Filing: 1989-02-09
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Granted: 1990-02-27
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Expires: 2009-02-09
Abstract
Abstract An automotive engine has a bypass around a throttle valve and at least one valve provided in the bypass. A plurality of reference pressures for pressures in an intake passage of the engine are stored in a memory so as to be derived in accordance with speed of the engine and opening degree of a throttle valve of the engine. Opening degree detected by a throttle position sensor is corrected with opening degree of the valve in the bypass to produce a corrected opening degree. A reference pressure is derived from the memory in accordance with the engine speed and the corrected opening degree. Pressure in an intake pipe is compared with the reference pressure derived from the memory. An abnormality signal is generated when the intake pipe pressure is higher than the reference pressure.
Inventors
- 👤 Shuji Miyama
- 👤 Hiroya Ohkumo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:56
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
206 words
A system for detecting troubles of an intake system of an engine having a bypass around a throttle valve and at least one valve provided in the bypass, comprising: storing means storing a plurality of reference pressures for pressures in an intake passage of the engine which are arranged to be derived in accordance with speed of the engine and opening degree of a throttle valve of the engine; a pressure sensor for detecting pressure in an intake passage of the engine; an engine speed detector for producing the speed of the engine; a throttle position sensor for detecting the opening degree of the throttle valve; detector means for detecting the opening degree of the valve in the bypass; correcting means for correcting the opening degree detected by the throttle position sensor with the opening degree detected by the detector means and for producing a corrected opening degree; means for deriving a reference pressure from the storing means in accordance with the detected engine speed and the corrected opening degree; comparator means for comparing a pressure detected by the pressure sensor with the reference pressure derived from the storing means and for producing an abnormality signal when the detected pressure is higher than the reference pressure.
Claim 2
Independent Claim
206 words
A system for detecting troubles of an intake system of an engine having a bypass around a throttle valve and at least one valve provided in the bypass, comprising: storing means storing a plurality of reference pressures for pressures in an intake passage of the engine which are arranged to be derived in accordance with speed of the engine and opening degree of a throttle valve of the engine; a pressure sensor for detecting pressure in an intake passage of the engine; an engine speed detector for producing the speed of the engine; a throttle position sensor for detecting the opening degree of the throttle valve; detector means for detecting the opening degree of the valve in the bypass; correcting means for correcting the opening degree detected by the throttle position sensor with the opening degree detected by the detector means and for producing a corrected opening degree; means for deriving a reference pressure from the storing means in accordance with the detected engine speed and the corrected opening degree; comparator means for comparing a pressure detected by the pressure sensor with the reference pressure derived from the storing means and for producing an abnormality signal when the detected pressure is higher than the reference pressure.
Claim 3
Dependent Claim
21 words
The system according to claim 1 wherein the bypass has an idle speed control valve and a fast idle control valve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |