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Method and system for pre-ignition control

A pre-ignition and cylinder technology, applied in ignition controllers, spark ignition controllers, electrical controls, etc., can solve problems such as fuel economy degradation

Active Publication Date: 2017-06-16
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, fuel economy can degrade

Method used

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  • Method and system for pre-ignition control
  • Method and system for pre-ignition control
  • Method and system for pre-ignition control

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Embodiment Construction

[0016] The following description relates to methods for detecting the delivery of thermal residue in a cylinder in response to after combustion or misfire in an adjacent cylinder, and adjusting spark and / or fuel injection to the affected cylinder in order to reduce post combustion or misfire induced pre-ignition events systems and methods. In engines equipped with small exhaust manifolds, such as figure 1 In an engine system, exhaust residues from a late combustion event in a first cylinder can increase exhaust manifold pressure such that the residues are forcibly received in a second adjacent cylinder. The engine controller can be configured to monitor, for example, based on valve timing ( Figure 2 to Figure 3 ) to determine the exhaust pressure profile of each cylinder during the exhaust valve event, as Figure 4 shown. Based on the exhaust pressure profile, the controller can execute control programs such as Figure 4 An example routine to identify the amount and tempe...

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Abstract

The invention relates to a method and system for pre-ignition control. Methods and systems are provided for adjusting spark and / or fuel injection to a cylinder based on late combustion, partial burn, or misfire in a neighboring cylinder. A pressure sensor coupled to a cylinder exhaust port is used to sample exhaust pressure pulsations over a cylinder exhaust valve event, and accurately estimate an amount of residuals generated in and released from the cylinder as well as residuals received from the neighboring cylinder. Mitigating actions are performed in the cylinder accordingly before the occurrence of a pre-ignition event.

Description

technical field [0001] The present description generally relates to methods and systems for controlling a vehicle engine to reduce pre-ignition events. Background technique [0002] Under certain operating conditions, engine cylinders may misfire or have slow combustion. These misfires or slow burns can increase the thermal residue that enters adjacent cylinders during cam or valve overlap. When this occurs, the thermal residue can cause misfire to cause pre-ignition in adjacent cylinders. Pre-ignition can generate very high in-cylinder pressures, which can result in a combustion pressure wave similar to combustion knock, but with greater intensity. [0003] Also, in boosted engines, late combustion events where combustion is later than expected can also lead to pre-ignition combustion events. Specifically, this post-combustion can result in high exhaust manifold pressures and temperatures, as well as higher than expected exhaust residues. This elevated exhaust manifold ...

Claims

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Application Information

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IPC IPC(8): F02D43/00F02D41/00F02D41/30
CPCF02D41/008F02D41/30F02D43/00F02D2200/0406F02D41/0087F02D41/1446F02D41/3023F02D41/402F02P9/002F02D35/02F02D2250/14F02D41/0062F02D41/1448Y02T10/40F02D41/006F02D41/3005F02D2200/021F02D2200/024
Inventor C·P·格卢格拉G·苏尔尼拉
Owner FORD GLOBAL TECH LLC