US5201294A
Expired / Lapsed
US
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Common-rail fuel injection system and related method
Assignee: Denso Corp
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Filing: 1992-02-27
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Granted: 1993-04-13
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Expires: 2012-02-27
Abstract
Abstract A common-rail fuel injection system for an engine includes a common rail for storing fuel. A plurality of pumps supply fuel to the common rail. Fuel is injected into the engine from the common rail. Feedback control is executed on the pressure of the fuel in the common rail. A device serves to detect whether or not at least one of the pumps fails. An arrangement decreases the pressure of the fuel in the common rail when the detecting device detects that at least one of the pumps fails.
Inventors
- 👤 Isao Osuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:16
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/3809; F02D41/3836; F02D41/3845; F02D41/22; F02D41/221; F02D41/3827; F02M; F02M59/00; F02M59/20; F02M59/36; F02M59/366; F02M63/00; F02M63/02; F02M63/0225; F02D2041/224; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0602; F02D2250/00; F02D2250/31; F02M59/02; F02M59/10; F02M59/105
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
86 words
A common-rail fuel injection system for an engine, comprising: a common rail storing fuel; a plurality of pumps supplying fuel to the common rail; means for injecting fuel into the engine from the common rail; means for feedback-controlling a pressure of the fuel in the common rail; means for detecting whether or not at least one of the pumps fails; and means for decreasing the pressure of the fuel in the common rail when said detecting means detects that at least one of the pumps fails.
Claim 2
Dependent Claim
86 words
A common-rail fuel injection system for an engine, comprising: a common rail storing fuel; a plurality of pumps supplying fuel to the common rail; means for injecting fuel into the engine from the common rail; means for feedback-controlling a pressure of the fuel in the common rail; means for detecting whether or not at least one of the pumps fails; and means for decreasing the pressure of the fuel in the common rail when said detecting means detects that at least one of the pumps fails.
Claim 3
Dependent Claim
52 words
The common-rail fuel injection system of claim 1, wherein said detecting means comprises means for detecting the pressure of the fuel in the common rail, and means for detecting whether or not at least one of the pumps fails in response to the detected pressure of the fuel in the common rail.
Claim 4
Dependent Claim
50 words
The common-rail fuel injection system of claim 1, wherein said feedback-controlling means maintains the pressure of the fuel in the common rail at a target pressure, and said decreasing means comprises means for decreasing the target pressure when said detecting means detects that at least one of the pumps fails.
Claim 5
Dependent Claim
84 words
The common-rail fuel injection system of claim 1, wherein said detecting means comprises means for changing operating conditions of one of the pumps, means for detecting a response of the pressure of the fuel in the common rail to said changing of operating conditions of one of the pumps by said changing means, and means for detecting whether or not at least one of the pumps fails on the basis of the detected response of the pressure of the fuel in the common rail.
Claim 6
Dependent Claim
107 words
The common-rail fuel injection system of claim 1, wherein said detecting means comprises idle detecting means for detecting whether or not the engine is idling, means for changing operating conditions of one of the pumps when said idle detecting means detects that the engine is idling, means for detecting a response of the pressure of the fuel in the common rail to said changing of operating conditions of one of the pumps by said changing means, and means for detecting whether or not at least one of the pumps fails on the basis of the detected response of the pressure of the fuel in the common rail.
Claim 7
Dependent Claim
117 words
The common-rail fuel injection system of claim 1, wherein said detecting means comprises means for selectively suspending one of the pumps, means for detecting the pressure in the fuel in the common rail and generating first detection data representative thereof when said suspending means does not suspend one of the pumps, means for detecting the pressure in the fuel in the common rail and generating second detection data representative thereof when said suspending means suspends one of the pumps, means for comparing the first detection data and the second detection data, and means for detecting whether or not at least one of the pumps fails in response to a result of said comparing by the comparing means.
Claim 8
Dependent Claim
168 words
The common-rail fuel injection system of claim 1, wherein said detecting means comprises idle detecting means for detecting whether or not the engine is idling, means for, in cases where said idle detecting means detects that the engine is idling, selectively suspending one of the pumps, means for, in cases where said idle detecting means detects that the engine is idling, detecting the pressure in the fuel in the common rail and generating first detection data representative thereof when said suspending means does not suspend one of the pumps, means for, in cases where said idle detecting means detects that the engine is idling, detecting the pressure in the fuel in the common rail and generating second detection data representative thereof when said suspending means suspends one of the pumps, means for comparing the first detection data and the second detection data, and means for detecting whether or not at least one of the pumps fails in response to a result of said comparing by the comparing means.
Claim 9
Dependent Claim
15 words
The common-rail fuel injection system of claim 1, wherein said engine comprises a diesel engine.
Claim 10
Dependent Claim
91 words
In a common-rail fuel injection system for an engine which comprises a common rail storing fuel, a plurality of pumps supplying fuel to the common rail, means for injecting fuel into the engine from the common rail, and means for feedback-controlling a pressure of the fuel in the common rail, a method comprising the steps of: detecting whether or not at least one of the pumps fails; and decreasing the pressure of the fuel in the common rail when said detecting step detects that at least one of the pumps fails.
Claim 11
Dependent Claim
91 words
In a common-rail fuel injection system for an engine which comprises a common rail storing fuel, a plurality of pumps supplying fuel to the common rail, means for injecting fuel into the engine from the common rail, and means for feedback-controlling a pressure of the fuel in the common rail, a method comprising the steps of: detecting whether or not at least one of the pumps fails; and decreasing the pressure of the fuel in the common rail when said detecting step detects that at least one of the pumps fails.
Claim 12
Dependent Claim
80 words
A common-rail fuel injection system for an engine, comprising: a common rail storing fuel; a plurality of pumps supplying fuel to the common rail; means for injecting fuel into the engine from the common rail; means for feedback-controlling a pressure of the fuel in the common rail; means for detecting whether or not at least one of the pumps fails; and means for decreasing a fuel supply quantity loaded on the pumps when said detecting means detects a pump failure.
Claim 13
Dependent Claim
80 words
A common-rail fuel injection system for an engine, comprising: a common rail storing fuel; a plurality of pumps supplying fuel to the common rail; means for injecting fuel into the engine from the common rail; means for feedback-controlling a pressure of the fuel in the common rail; means for detecting whether or not at least one of the pumps fails; and means for decreasing a fuel supply quantity loaded on the pumps when said detecting means detects a pump failure.
Claim 14
Dependent Claim
35 words
The common-rail fuel injection system of claim 10, wherein said decreasing means comprises means for decreasing a fuel injecting quantity injected by the injection means to decrease the loaded fuel supply quantity on the pumps.
Claim 15
Dependent Claim
38 words
The common-rail fuel injection system of claim 10, further comprising means for maintaining a quantity of fuel injected by the injecting means at a target quantity, and wherein said decreasing means comprises means for decreasing the target quantity.
Claim 16
Dependent Claim
29 words
The common-rail fuel injection system of claim 12, wherein said decreasing means comprises means for limiting the target quantity within a range upper bounded by a predetermined guard quantity.
Claim 17
Dependent Claim
59 words
The common-rail fuel injection system of claim 12, further comprising means for determining a target common-rail pressure and decreasing the target common-rail pressure according to said decreasing of the target quantity, and wherein said feedback-controlling means comprises means for controlling the pressure of the fuel in the common rail at the target common-rail pressure determined by the determining means.
Claim 18
Dependent Claim
91 words
In a common-rail fuel injection system for an engine which comprises a common rail storing fuel, a plurality of pumps supplying fuel to the common rail, means for injecting fuel into the engine from the common rail, and means for feedback-controlling a pressure of the fuel in the common rail, a method comprising the steps of: detecting whether or not at least one of the pumps fails; and decreasing a fuel supply quantity loaded on the pumps when said detecting step detects that at least one of the pumps has failed.
Claim 19
Dependent Claim
91 words
In a common-rail fuel injection system for an engine which comprises a common rail storing fuel, a plurality of pumps supplying fuel to the common rail, means for injecting fuel into the engine from the common rail, and means for feedback-controlling a pressure of the fuel in the common rail, a method comprising the steps of: detecting whether or not at least one of the pumps fails; and decreasing a fuel supply quantity loaded on the pumps when said detecting step detects that at least one of the pumps has failed.
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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) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |