Hand-held power tool and method for operating a heating device of a hand-held power tool
A hand-held power tool has a drive motor driving a tool and a generator. One or more heating devices having one or more heating elements are provided. The generator supplies the one or more heating devices with energy. A control device controls a power supplied to the one or more heating elements as a function of at least one operating parameter of the drive motor.
1. A hand-held power tool comprising:
a drive motor,
a tool driven by said drive motor;
a generator driven by said drive motor, wherein a power provided by said generator increases as an engine speed of said drive motor increases;
one or more heating devices comprising one or more heating elements, wherein said generator supplies said one or more heating devices with energy;
a control device controlling a power supplied to at least one of said one or more heating elements as a function of said engine speed of said drive motor;
wherein the power supplied to said at least one heating element is reduced as a function of said engine speed relative to the power provided by said generator.
2. The power tool according to claim 1 , wherein said one or more heating devices have a temperature sensor for a temperature-dependent control of said power.
3. The power tool according to claim 2 , wherein said temperature sensor is an NTC resistor.
4. The power tool according to claim 2 , wherein said temperature sensor is arranged at a spacing from said one or more heating elements.
5. The power tool according to claim 1 , wherein said drive motor is an internal combustion engine comprising a carburetor and wherein one of said one or more heating devices is a carburetor heater.
6. The power tool according to claim 5 , wherein said one or more heating devices have a temperature sensor for a temperature-dependent control of said power and wherein said temperature sensor is connected to said carburetor by a contact surface providing a thermally conducting connection.
7. The power tool according to claim 1 , comprising at least one handle for guiding the power tool, wherein one of said one or more heating devices is a handle heater.
8. The power tool according to claim 1 , wherein said power increases with increasing engine speed of said drive motor.
9. The power tool according to claim 1 , wherein the power supplied to said at least one heating element is reduced above a limit value of said engine speed.
10. A hand-held power tool comprising:
a drive motor;
a tool driven by said drive motor;
a generator driven by said drive motor;
one or more heating devices comprising one or more heating elements, wherein said generator supplies said one or more heating devices with energy;
a control device controlling a power supplied to at least one of said one or more heating elements as a function of at least one operating parameter of said drive motor;
wherein said drive motor is an internal combustion engine comprising a carburetor and wherein one of said one or more heating devices is a carburetor heater;
wherein said one or more heating devices have a temperature sensor for a temperature-dependent control of said power and wherein said temperature sensor is connected to said carburetor by a contact surface providing a thermally conducting connection;
wherein said temperature sensor has a cover that thermally shields said temperature sensor except said contact surface.
11. The power tool according to claim 10 , wherein said cover is a plastic cap.
12. The power tool according to claim 10 , comprising a support wherein said control device and said temperature sensor are arranged on said support and wherein said cover is connected to said support by a snap-on connection.
13. A method for operating a heating device of a hand-held power tool comprising a drive motor, a tool driven by the drive motor, a generator driven by the drive motor, one or more heating devices each comprising one or more heating elements, wherein the generator supplies energy to the one or more heating devices; said method comprising the step of:
controlling a power supplied by a generator to at least one of the heating elements as a function of an engine speed of the drive motor and reducing the power supplied to the at least one heating element as a function of the engine speed relative to the power provided by the generator.
14. The method according to claim 13 , wherein, in the step of controlling, the power is reduced above a limit value.
15. The method according to claim 13 , wherein the engine speed is derived from a voltage signal of the generator.
16. The method according to claim 13 , wherein the at least one operating parameter is a temperature measured by a temperature sensor.
17. A method for operating a heating device of a hand-held power tool comprising a drive motor, a tool driven by the drive motor, a generator driven by the drive motor, one or more heating devices each comprising one or more heating elements, wherein the generator supplies energy to the one or more heating devices; said method comprising the step of:
controlling a power supplied by a generator to at least one of the heating elements as a function of at least one operating parameter of the drive motor, wherein, in the step of controlling, every other half wave of a voltage signal generated by the generator is blocked from being supplied to the at least one heating element when a limit value of the at least one operating parameter is surpassed.
18. The method according to claim 17 , wherein, in the step of controlling, phase control is used on the voltage signal generated by the generator.