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Method for controlling an internal combustion engine using processed accelerometer signals

A technology of accelerometer and internal combustion engine, applied in electrical control, automatic control, automatic control and other directions, can solve the problem of accurate measurement of accelerometer

Active Publication Date: 2009-04-15
WESTPORT POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the use of an accelerometer does not give an accurate measurement of the pressure in the cylinder prior to combustion and thus can cause problems when applying the technique proposed in US Patent 6,598,468

Method used

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  • Method for controlling an internal combustion engine using processed accelerometer signals
  • Method for controlling an internal combustion engine using processed accelerometer signals
  • Method for controlling an internal combustion engine using processed accelerometer signals

Examples

Experimental program
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Embodiment Construction

[0034] A method of controlling fuel start of combustion (SOC) within a combustion chamber of an internal combustion engine is provided.

[0035] Referring to FIG. 1 , there is provided a flowchart illustrating the subject method for controlling the initiation of combustion in an internal combustion engine. Referring to the engine 100, here, the accelerometer signal 102 (y(θ)) is first determined by the accelerometer across a selected crank angle (θ) window of the engine cycle. These values ​​may be filtered through an anti-aliasing filter 104, converted to a digital data set 106 and windowed. In step 110, the crank angle window (θ w ) can be predetermined and take into account engine characteristics and operating conditions. The windowed data may be averaged over the same selected window of crank angles over multiple engine cycles using an ensemble averaging filter 108 . A bandpass filter 112 can be applied to the averaged and windowed digital knock signal (y(θ) avg ) to g...

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PUM

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Abstract

A method for processing an accelerometer data set generated from an operating internal combustion engine is disclosed. The processed accelerometer data is cepstrally filtered and a heat release trace is pulled from the accelerometer data set. That heat release trace is then used to estimate combustion quality and combustion phasing within the engine and control future combustion events using this information. Misfire and knock sensing is also incorporated into the engine controls. The method provides controls for an engine to allow it to adjust combustion from cycle window to cycle window generally without the need for expensive and less durable direct pressure measurement devices as compared to accelerometers. The resulting fuel injection speed results in the fuel passing through shock waves within the combustion chamber, which, in turn, promotes combustion of the fuel by promoting mixing of the fuel and intake charge within the combustion chamber.

Description

technical field [0001] The present invention relates to methods and apparatus for controlling internal combustion engines using accelerometers. Background technique [0002] Internal combustion engines benefit from real-time estimation of combustion quality and start of combustion (SOC). Knowing when combustion begins helps provide a control strategy that can adjust the SOC in future engine cycles to improve engine performance. One type of engine that would substantially benefit from SOC monitoring or estimation is an engine that relies on auto-ignition of a premixed fuel and air charge. Auto-ignition of premixed fuel and air charges is referred to herein as compression ignition of premixed charges, or PCCI. Utilizing a PCCI combustion mode rather than a typical diffusion or flame propagation combustion mode tends to have emissions and efficiency benefits. An additional combustion strategy that benefits from SOC estimation is an engine that supplements the energy provided...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D35/02F02D41/14F02P5/15
Inventor 理查德·安西默
Owner WESTPORT POWER