US4794790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diagnostic method and arrangement for quantitatively checking actuators in internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1987-07-17
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Granted: 1989-01-03
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Expires: 2007-07-17
Abstract
Abstract A diagnostic method and arrangement quantitatively checks actuators during the open-loop and/or closed-loop control of operational parameters of an internal combustion engine. The method and arrangement checks the idle actuator and the tank venting value well as the associated hardward chains, that increased or decreased quantities of air (±ΔQ TEV/LLR ) be supplied via an appropriate controlling to the tank-venting valve or of the idle regulator, preferbly simultaneously and in opposite directions and that the resulting possible changes of rotational speed (rotational speed remains constant; rotational speed decreases; rotational speed increases) be determined and appropriately evaluated.
Inventors
- 👤 Florin Margarit-Metaxa
- 👤 Helmut Denz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:24
CPC Classifications
G; G01; G01M; G01M15/00; F; F02; F02D; F02D35/00; F02D35/0007; F02D41/00; F02D41/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
A diagnostic method for quantitatively checking actuators in the open-loop and closed loop control of operating parameters of an internal combustion engine which includes: a fuel metering apparatus; an air-flow sensor; and, a central control unit including computer units; and, an exhaust system accommodating a lambda control, the actuators including the idle actuator and tank-venting valve (TEV) for effecting a tank ventilation, said actuators having respective hardware chains, the method comprising the steps of: supplying increased or reduced air quantities (ΔQ TEV , ΔQ LLR ) by means of a corresponding control of one of the tank-venting valve (TEV) and the idle actuator (LLS) during the operation of the engine; and, observing feedback of rotational speed changes which occur (rotational speed n=constant; n Diagn >n alt ; and, n Diagn <n alt ) to provide an indication as to the functioning capability of the hardware chains of said actuators wherein: n Diagn is the diagnosed speed of the engine; and, n alt is the engine prior to starting the diagnosis.
Claim 2
Dependent Claim
170 words
A diagnostic method for quantitatively checking actuators in the open-loop and closed loop control of operating parameters of an internal combustion engine which includes: a fuel metering apparatus; an air-flow sensor; and, a central control unit including computer units; and, an exhaust system accommodating a lambda control, the actuators including the idle actuator and tank-venting valve (TEV) for effecting a tank ventilation, said actuators having respective hardware chains, the method comprising the steps of: supplying increased or reduced air quantities (ΔQ TEV , ΔQ LLR ) by means of a corresponding control of one of the tank-venting valve (TEV) and the idle actuator (LLS) during the operation of the engine; and, observing feedback of rotational speed changes which occur (rotational speed n=constant; n Diagn >n alt ; and, n Diagn <n alt ) to provide an indication as to the functioning capability of the hardware chains of said actuators wherein: n Diagn is the diagnosed speed of the engine; and, n alt is the engine prior to starting the diagnosis.
Claim 3
Dependent Claim
111 words
The diagnostic method of claim I, wherein an increased air quantity (ΔQ TEV ) is supplied by opening the tank-venting valve and simultaneously therewith, a correspondingly decreased air quantity (-ΔQ LLR ) is supplied by closing the idle actuator with the particular air quantities (ΔQ) being held equal, so that the total air flow remains constant and so that subsequently the rotational speed which remains substantially constant, the actuators with the respective hardware chains associated therewith are judged as operating correctly and, with an increase in rotational speed, the idle actuator is recognized as being defective and, with a reduction in rotational speed, the tank-venting valve is recognized as being defective.
Claim 4
Dependent Claim
170 words
Arrangement for performing a quantitative self-diagnosis of actuators in the open-loop and closed loop control of operating parameters of an internal combustion engine, the actuators including idle actuator (LLS) and tank-venting valve (TEV), the arrangement comprising: supply means for supplying an increased air quantity or reduced air quantity [(ΔQ TEV/LLR )](ΔQ TEV , ΔQ LLR ) to the inlet region of the internal combustion engine by means of a corresponding control of said actuators; comparison means for comparing the speed of the engine prior to the air flow change with a diagnosed rotational speed; and, indication means for indicating a defect in response to a speed change of one of the tank-venting valve n Diagn <n alt -Δn Tol ) and the idle actuator (n Diagn >n alt +Δn Tol ) wherein: n Diagn is the diagnosed speed of the engine; n alt is the engine speed prior to starting the diagnosis; and, Δn Tol is the tolerance of rotational speed deviation (engine constant value, to be ascertained during application).
Claim 5
Dependent Claim
170 words
Arrangement for performing a quantitative self-diagnosis of actuators in the open-loop and closed loop control of operating parameters of an internal combustion engine, the actuators including idle actuator (LLS) and tank-venting valve (TEV), the arrangement comprising: supply means for supplying an increased air quantity or reduced air quantity [(ΔQ TEV/LLR )](ΔQ TEV , ΔQ LLR ) to the inlet region of the internal combustion engine by means of a corresponding control of said actuators; comparison means for comparing the speed of the engine prior to the air flow change with a diagnosed rotational speed; and, indication means for indicating a defect in response to a speed change of one of the tank-venting valve n Diagn <n alt -Δn Tol ) and the idle actuator (n Diagn >n alt +Δn Tol ) wherein: n Diagn is the diagnosed speed of the engine; n alt is the engine speed prior to starting the diagnosis; and, Δn Tol is the tolerance of rotational speed deviation (engine constant value, to be ascertained during application).
References Cited (Backward Citations)
US4402217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |