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Apparatus and method for limiting excessive engine speeds in a light-duty combustion engine

A technology of engine speed and engine, applied in the field of ignition system, can solve problems such as unintentional ignition

Inactive Publication Date: 2007-06-20
WALBRO ENGINE MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this method is generally effective, under certain operating conditions the engine may experience a situation in which unintentional ignition occurs even though the ignition system has not yet provided any spark

Method used

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  • Apparatus and method for limiting excessive engine speeds in a light-duty combustion engine
  • Apparatus and method for limiting excessive engine speeds in a light-duty combustion engine
  • Apparatus and method for limiting excessive engine speeds in a light-duty combustion engine

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Embodiment Construction

[0012] The controlled deceleration method disclosed here limits excessively high engine speeds of the light-duty internal combustion engine so that undesired damage to the engine, the driver or others can be avoided. Preferably, the controlled deceleration method is embodied in the form of some electronic commands that can be automatically executed by an ignition control circuit that is part of a larger spark ignition system. The following paragraphs describe various examples of spark ignition systems and ignition control circuits utilizing a controlled deceleration method, however, these examples are merely illustrative examples and various other systems and circuits may be substituted.

[0013] Ignition system-

[0014] Referring to FIG. 1 , there is shown an example of an ignition system 10 for a light duty internal combustion engine that may utilize the controlled deceleration method disclosed herein. Ignition system 10 is preferably a capacitive discharge type ignition s...

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PUM

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Abstract

A controlled slow down apparatus and method for use in the event that a light-duty combustion engine has entered a state of excessive speeds or auto-ignition. The controlled slow down method is preferably initiated when the engine speed exceeds an activation speed for a predetermined number of engine revolutions. Once initiated, the controlled slow down method uses a combination of ignition timing and spark ratio manipulations in order to disrupt the auto-ignition conditions and slow down the engine in a controlled manner. Preferably, the controlled slow down method is only one part of an overall ignition control method, and can be incorporated within or utilized by one of a number of different ignition timing methods known in the art.

Description

technical field [0001] The present invention relates generally to ignition systems for light duty internal combustion engines, and more particularly to ignition control circuits and methods for limiting excessive engine speed. Background technique [0002] As used herein, the term "light duty internal combustion engine" broadly includes all types of non-automotive internal combustion engines including, but not limited to, two-stroke and four-stroke engines used with hand-held power tools, lawn and garden equipment, lawnmowers, Weed trimmers, edge trimmers, chainsaws, snow blowers, personal watercraft, boats, snowmobiles, motorcycles, ATVs and more. Most light duty internal combustion engines have some type of engine speed limiting device which prevents the engine from being subjected to excessively high speeds which could otherwise cause undesired damage or sudden failure. [0003] For example, it is known to provide a light duty internal combustion engine with means for li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02P5/145
CPCF02D2400/06F02P5/1502F02P9/005Y02T10/46Y02T10/40
Inventor M·N·安德森G·M·帕图洛
Owner WALBRO ENGINE MANAGEMENT
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