Method for operating a handheld work apparatus having a combustion engine
US-9873193-B2 · Jan 23, 2018 · US
Handheld engine-driven working machine
US10247165B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10247165-B2 |
| Application number | US-201715485426-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 12, 2017 |
| Priority date | Apr 12, 2016 |
| Publication date | Apr 2, 2019 |
| Grant date | Apr 2, 2019 |
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- Title
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Abstract
Official abstract text for this publication.
A handheld engine-driven working machine comprises an internal combustion engine with a throttle valve, a throttle adjusting device for adjusting an opening degree of the throttle valve of the internal combustion engine, and a control device provided in the internal combustion engine. The control device is configured to detect a rotational speed and an amount of change in the rotational speed at every at least one rotation of the internal combustion engine. The control device determines that the throttle valve is partially opened when the amount of change in the rotational speed is greater than a predetermined value.
First claim
Opening claim text (preview).
What is claimed: 1. A handheld engine-driven working machine comprising: an internal combustion engine with a throttle valve; a centrifugal clutch coupled to the internal combustion engine and operating at a rotational speed equal to or greater than a clutch-in rotational speed; a throttle adjusting device for adjusting an opening degree of the throttle valve of the internal combustion engine; and a control device provided in the internal combustion engine; wherein at the rotational speed higher than the clutch-in rotational speed the control device is configured to detect a rotational speed and an amount of change in the rotational speed at at least once in each rotation of the internal combustion engine, and determines that the throttle valve is partially opened when the amount of change in the rotational speed is greater than a predetermined value which is defined to change according to a change in the rotational speed. 2. The handheld engine-driven working machine according to claim 1 , wherein the amount of change in the rotational speed is a rate of rotational speed variation, a maximum value of a difference between the rotational speeds at two successive rotations during a predetermined number of successive rotations, a difference between a maximum value and a minimum value of the rotational speed at every rotation during a predetermined number of successive rotations, or an accumulated amount of differences between the rotational speeds at two successive rotations during a predetermined number of successive rotations. 3. The handheld engine-driven working machine according to claim 1 , wherein the predetermined value is different depending on a rotational speed zone. 4. The handheld engine-driven working machine according to claim 1 , wherein the predetermined value becomes larger as the rotational speed becomes larger. 5. The handheld engine-driven working machine according to claim 1 , wherein the control device retards an ignition timing of the internal combustion engine after it determines that the throttle valve is partially opened.
Assignees
Inventors
Classifications
- F02P5/04Primary
automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions (dependent on position of personal controls of engine F02P5/02) · CPC title
Engine speed gradient · CPC title
using one central computing unit · CPC title
Small engines with electronic control, e.g. for hand held tools · CPC title
Digital data processing · CPC title
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Frequently asked questions
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- What does patent US10247165B2 cover?
- A handheld engine-driven working machine comprises an internal combustion engine with a throttle valve, a throttle adjusting device for adjusting an opening degree of the throttle valve of the internal combustion engine, and a control device provided in the internal combustion engine. The control device is configured to detect a rotational speed and an amount of change in the rotational speed a…
- Who is the assignee on this patent?
- Yamabiko Corp
- What technology area does this patent fall under?
- Primary CPC classification F02P5/04. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Apr 02 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).