Hand-portable garden, forestry and/or construction processing device and method for operating a hand-portable garden, forestry and/or construction processing device

Patent metadata

Field	Value
Publication number	US-11731305-B2
Application number	US-202117206452-A
Country	US
Kind code	B2
Filing date	Mar 19, 2021
Priority date	Mar 20, 2020
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A hand-portable garden, forestry and/or construction processing device has a cutting tool, an electric drive motor, a motor operating element, and a control device. The cutting tool is designed for cutting through work. The drive motor is designed for driving the cutting tool. The motor operating element is user-adjustable over an adjustment range from a minimum setting to a maximum setting. The control device is designed for controlling a target speed of the drive motor in accordance with a setting of the motor operating element in at least one first operating mode and one second operating mode. In the first operating mode, the target speed increases over at least one segment from a minimum of 0.5 times the adjustment range as the setting increases, wherein the increase changes over the segment by a maximum of 60%. In the second operating mode, the target speed is a minimum of 0.9 times a maximum target speed of the second operating mode as the setting increases from a maximum of 50% of the adjustment range.

First claim

What is claimed is:

1. A hand-portable garden, forestry and/or construction processing device, comprising:
a cutting tool, wherein the cutting tool is designed for cutting through an item to be processed;
an electric drive motor, wherein the drive motor is designed for driving the cutting tool;
a motor operating element, wherein the motor operating element is user-adjustable over an adjustment range from a minimum setting to a maximum setting; and
a control device, wherein the control device is designed for controlling a target speed of the drive motor in accordance with a setting of the motor operating element in a first operating mode and a second operating mode,
wherein, in the first operating mode, the target speed increases over at least one segment from a minimum of 0.5 times the adjustment range as the setting increases, wherein the target speed increase changes over the segment by a maximum of 60%, and
wherein, in the second operating mode, the target speed is a minimum of 0.9 times a maximum target speed of the second operating mode as the setting increases from a maximum of 50% of the adjustment range.

2. The hand-portable garden, forestry and/or construction processing device according to claim 1 ,
wherein the garden, forestry and/or construction processing device is a saw, a chainsaw, a brushcutter, or a cut-off grinder, and/or
wherein the cutting tool is a sawing tool, a saw chain or a saw blade or a cutting blade.

3. The hand-portable garden, forestry and/or construction processing device according to claim 1 , wherein one of:
(i) in the first operating mode, the target speed increases linearly over the at least one segment as the setting increases, or
(ii) in the first operating mode, the target speed increase lessens over the segment as the setting increases.

4. The hand-portable garden, forestry and/or construction processing device according to claim 3 ,
wherein, in the second operating mode, the target speed increases from a minimum target speed up to a minimum of 0.9 times the maximum target speed of the second operating mode, as the setting increases.

5. The hand-portable garden, forestry and/or construction processing device according to claim 4 ,
wherein, in the second operating mode, the target speed increases from a start setting of the motor operating element up to a maximum of 50% of the adjustment range,
wherein the target speed increase changes by a maximum of 60% from the start setting up to the maximum of 50% of the adjustment range, and/or lessens as the setting increases from the start setting.

6. The hand-portable garden, forestry and/or construction processing device according to claim 1 , wherein
in the second operating mode, the target speed is the maximum target speed of the second operating mode as the setting increases from the maximum of 50% of the adjustment range.

7. The hand-portable garden, forestry and/or construction processing device according to claim 1 , wherein
the maximum target speed of the second operating mode is higher than a maximum target speed of the first operating mode.

8. The hand-portable garden, forestry and/or construction processing device according to claim 1 , wherein
the control device is designed for controlling the target speed to be the minimum of 0.9 times the maximum target speed of the second operating mode by way of field weakening in the drive motor.

9. The hand-portable garden, forestry and/or construction processing device according to claim 1 , wherein
the control device is designed for controlling up to the minimum of 0.9 times the maximum target speed of the second operating mode with a minimum of 0.8 times a maximum output power of the drive motor.

10. The hand-portable garden, forestry and/or construction processing device according to claim 1 , wherein at least one of:
(i) the drive motor is a brushless DC motor, a permanent magnet synchronous motor or an asynchronous motor, or
(ii) the control device is designed for field-oriented control (FOC) control or direct torque control (DTC) control.

11. The hand-portable garden, forestry and/or construction processing device according to claim 1 , further comprising:
an electric adjusting device,
wherein the motor operating element is designed for setting an electric variable of the electric adjusting device, and
wherein the control device is designed for controlling the target speed in accordance with the electric variable.

12. The hand-portable garden, forestry and/or construction processing device according to claim 1 , wherein at least one of:
(i) in the first operating mode, the target speed decreases when the motor operating element is returned to its minimum setting from the target speed last controlled in the time before the return, or
(ii) in the second operating mode, the target speed decreases when the motor operating element is returned to its minimum setting from the target speed last controlled in the time before the return.

13. The hand-portable garden, forestry and/or construction processing device according to claim 12 , wherein at least one of:
(i) in the first operating mode, the target speed decreases from a maximum target speed to zero over a run-down time range of the first operating mode, wherein the target speed decrease changes by a maximum of 60% over a minimum of 0.9 times the run-down time range, or
(ii) in the second operating mode, the target speed decreases from the maximum target speed to zero over a run-down time range of the second operating mode, said target speed decreasing in a first half by a maximum of 0.5 times as much as it decreases in a later half.

14. The hand-portable garden, forestry and/or construction processing device according to claim 1 , further comprising:
a motor operating element return element,
wherein the motor operating element return element is designed for applying force to the motor operating element to return the motor operating element to its minimum setting.

15. The hand-portable garden, forestry and/or construction processing device according to claim 1 , further comprising:
a user-operable switchover operating element,
wherein the control device is designed for switching over between at least the first operating mode and the second operating mode upon being triggered by an operation of the switchover operating element.

16. The hand-portable garden, forestry and/or construction processing device according to claim 1 , further comprising:
an output device,
wherein the output device is designed to output user-perceivable information about control in at least the first operating mode or the second operating mode.

17. A method for operating a hand-portable garden, forestry and/or construction processing device comprising:
a cutting tool, wherein the cutting tool is designed for cutting through an item to be processed;
an electric drive motor, wherein the drive motor is designed for driving the cutting tool;
a motor operating element, wherein the motor operating element is user-adjustable over an adjustment range from a minimum setting to a maximum setting; and
a control device, wherein the control device is designed for controlling a target speed of the drive motor in accordance with a setting of the motor operating element in a first operating mode and a second operating mode,
wherein, in the first operating mode, the target speed increases over at least one segment from a minimum of 0.5 times the adjustment range as the setting increases, wherein the target speed increase changes over the segment by a maximum of 60%, and
wherein

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Heinzelmann Georg
• Sontheim Pirmin
• Haas Alexander
• Seibold Peter

Classifications

• B27B17/08 Primary

  Drives or gearings; Devices for swivelling or tilting the chain saw · CPC title

• B23D57/00 Primary

  Sawing machines or sawing devices not covered by one of the preceding groups B23D45/00 - B23D55/00 · CPC title

• B23Q5/28

  Electric drives · CPC title

• A01G3/085

  Motor-driven saws for pruning or branching · CPC title

• A01G3/086

  Chain saws · CPC title