Two-stroke engine control

A two-stroke internal combustion engine and controller technology, applied in the direction of engine control, fuel injection control, electrical control, etc., can solve the problems of increasing engine emissions, increasing the amount of unburned fuel, etc., and achieve reduced wear, low implementation, and low complexity Effect

Active Publication Date: 2021-02-12
HUSQVARNA AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, by cutting off the ignition, this leads to an increase in the amo

Method used

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  • Two-stroke engine control
  • Two-stroke engine control
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Embodiment Construction

[0040] Aspects of the present disclosure will now be described more fully with reference to the accompanying drawings. However, the different apparatus, computer programs and methods disclosed herein may be implemented in many different forms and should not be construed as limited to the aspects set forth herein. Like numbers refer to like elements throughout the drawings.

[0041] The terms used herein are used only to describe aspects of the present disclosure and are not intended to limit the present invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

[0042] figure 1 A two-stroke engine 100 is shown schematically. Piston 130 is arranged to reciprocate in a cylinder including combustion chamber 120 . As the piston moves upward, a fuel / air mixture having a composition determined by the fuel setting is injected into chamber 120 . The fuel / air mixture is ignited...

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Abstract

A two-stroke combustion engine comprising a user-operated throttle control, an adjustable valve arranged to control one or more air intakes of the combustion engine, and a control unit arranged to control a state of the adjustable valve, wherein the combustion engine is arranged to operate in a first idle mode at an idle engine speed below a clutch engagement engine speed when the user-operated throttle control is not engaged, wherein the combustion engine is arranged to operate in a second idle mode at a target engine speed above the clutch engagement engine speed when the user-operated throttle control is engaged and when the engine is not subject to an external load, the control unit being arranged to control the state of the adjustable valve to maintain engine speed at the target engine speed when the engine operates in the second idle mode.

Description

technical field [0001] The present disclosure relates to a two-stroke internal combustion engine comprising a user-operated throttle control and an adjustable valve arranged to control an intake port of the internal combustion engine. The present disclosure also relates to power tools including internal combustion engines and related methods and computer programs. Background technique [0002] Two-stroke engines are commonly used in hand-held power tools and the like where a high power-to-weight ratio is required. Such two-stroke engines are typically optimized to operate under full load and wide open throttle (WOT). For example, an engine's scavenging system is typically optimized for operation at high engine speeds and full load. As long as the engine is operating close to the optimized ideal operating point, misfires, high temperatures and high emissions can be avoided. However, if the engine is operated far from the ideal operating point, suboptimal engine performance...

Claims

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Application Information

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IPC IPC(8): F02D41/00F02D9/02B23D45/16F02B63/02
CPCF02B63/02B23D47/12F02D2009/0208F02D2009/0272F02D2009/0279F02D39/04F02D41/08F02D41/022F02D2200/021F02D2200/101F02D2200/1002F02D2400/04F02D2400/06F02D31/003Y02T10/40F02D41/0002F02D2200/0404F02D2200/501
Inventor 马茨·拉韦纽斯布·卡尔松
Owner HUSQVARNA AB
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