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Fuel system diagnostics by analyzing cylinder pressure signal

A cylinder pressure and pressure technology, which is applied in the field of compression ignition engines, can solve problems such as variability affecting cylinder heat release and work output, and engine non-optimal performance

Inactive Publication Date: 2011-05-18
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combustion variability affects the heat release and work output of each cylinder, resulting in non-optimal engine performance

Method used

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  • Fuel system diagnostics by analyzing cylinder pressure signal
  • Fuel system diagnostics by analyzing cylinder pressure signal
  • Fuel system diagnostics by analyzing cylinder pressure signal

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Embodiment Construction

[0016] With reference to the accompanying drawings, wherein the drawings are for the purpose of illustrating specific embodiments only, and are not intended to be limiting to specific embodiments, figure 1 For schematic purposes, an internal combustion engine 10 , a control module 5 and an exhaust aftertreatment system 15 constructed in accordance with an embodiment of the present disclosure are shown. An exemplary engine includes a multi-cylinder direct injection compression ignition internal combustion engine having a reciprocating piston 22 connected to a crankshaft 24 and movable within cylinders 20 defining a variable volume combustion chamber 34 . Crankshaft 24 is operatively connected to the vehicle transmission and driveline to deliver tractive torque to the transmission and driveline in response to an operator torque request (TO_REQ), the engine preferably using a four-stroke operation wherein each engine combustion cycle includes 720 degrees As the crankshaft 24 rota...

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Abstract

A method for diagnosing combustion within a direct-injection, internal combustion engine including a plurality of combustion chambers and operative lean of stoichiometry includes monitoring combustion in the combustion chambers and estimating mass fraction burn therein. Mass fraction burn of sequential ones of the plurality of combustion chambers are compared and combustion phasing differences between sequential ones of the plurality of combustion chambers based on said mass fraction burn comparisons are identified.

Description

technical field [0001] The present disclosure relates to the operation and control of internal combustion engines, including compression ignition engines. Background technique [0002] The contents in this section merely provide background technology related to the present disclosure and may not constitute prior art. [0003] Various intrusive and non-intrusive pressure sensing devices are known for sensing pressure in cylinders of internal combustion engines when the engine is being driven by an electric motor and when the engine is firing. [0004] Combustion timing or phasing is useful for diagnosing problems in the combustion process. Examining mass fraction combustion is a known method of examining cylinder combustion phasing. Mass fraction burn is an estimate of how much of the charge in the combustion chamber of the cylinder has been burned at a given crank angle. For a normal combustion process operating under a specific set of parameters, mass fraction combustion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/22F02D25/00F02D41/04F02B23/10F02D35/00
CPCF02D35/02F02D35/023F02D2200/1015F02D35/028Y02T10/40F02D41/221
Inventor Y·王I·哈斯卡拉C-B·M·关F·A·马特库纳斯P·A·巴蒂斯顿
Owner GM GLOBAL TECH OPERATIONS LLC
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