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Fuel injection control system ensuring steady balance in pressure in accumulator

一种燃料喷射、控制系统的技术，应用在系统领域，能够解决燃料量不均衡、燃料压力加剧波动、不稳定性等问题

Inactive Publication Date: 2007-06-13
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, if one or more of the fuel injectors fails to energize due to, for example, a disconnection of the injector power supply line or a mechanical or electrical failure of one or more of the fuel injectors themselves, this will result in a concomitant Fuel injected into the engine Instability in synchronous supply of fuel into the common rail, resulting in an imbalance in the amount of fuel flowing into and out of the common rail
This leads to increased fluctuations in the fuel pressure in the common rail and reduces the controllability of the pressure in the common rail

Method used

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  • Fuel injection control system ensuring steady balance in pressure in accumulator
  • Fuel injection control system ensuring steady balance in pressure in accumulator
  • Fuel injection control system ensuring steady balance in pressure in accumulator

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Embodiment Construction

[0086] Referring to the drawings, in which like reference numerals are used for like parts in several figures, and in particular to FIG. 1 , there is shown an engine control system according to a first embodiment of the invention, which is designed, for example, with A common rail injection system (also known as an accumulator injection system) for controlling fuel injection into a diesel engine.

[0087] The fuel pump 4 is used to pump fuel out of the fuel tank 2 and supply fuel into the common rail 10 . The fuel pump 4 is provided with first and second plungers (not shown) and first and second metering valves 6 and 8 . Each first and second metering valve 6 , 8 is designed as a discharge control valve (also referred to as a pump control valve) in order to control the amount of fuel drawn from the fuel tank 4 to be discharged into the common rail 10 . Specifically, the electronic control unit (ECU) 20 controls each of the first and second metering valves 6, 6, The opening o...

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Abstract

An accumulator fuel injection system working to energize fuel injectors to inject fuel at a sequence of injection timings into an internal combustion engine and also to control a fuel pump to feed the fuel to an accumulator at a sequence of controlled times for compensating for the amount of the fuel flowing out of the accumulator under feedback control. When having found a failure in operation of at least one of the fuel injectors, the system alters a mode of the feedback control to decrease the amount of fuel fed to the accumulator at one of the sequence of the controlled times which is at a selected interval away from one of the sequence of the injection timings at which the at least one of the fuel injectors is to be energized, thereby ensuring a steady balance between the amounts of fuel flowing into and out of the accumulator.

Description

[0001] Cross-reference to related literature [0002] This application claims priority based on Japanese Patent Application No. 2005-350708 filed on December 5, 2005, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates generally to a fuel injection control system having a fuel accumulator and a fuel injector for injecting fuel supplied from said fuel accumulator, and more particularly to a system designed to ensure A stable balance between the amount of fuel supplied to and discharged from the accumulator. Background technique [0004] A known common rail fuel injection system for motor vehicle diesel engines has a controller, a common rail and a fuel pump. For example, Japanese Patent First Publication No. 62-258160 discloses a typical common rail injection system. Generally, the common rail injection system is designed to determine the target fuel pressure in the common rail according to the operating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14
CPCF02M59/462F02D41/3845F02D41/221F02M63/0225
Inventor 早川良树
Owner DENSO CORP