Method for the contactless detection of the position of a butterfly valve shaft of a butterfly valve connecting piece and butterfly valve connecting piece
First Claim
1. A method for contactless detection of a position of a butterfly valve shaft of a butterfly valve connecting piece, the butterfly valve connecting piece having a housing which can be closed off by a lid and a throttle orifice which is arranged in the housing, for a butterfly valve which is arranged on the butterfly valve shaft, the butterfly valve shaft being capable of being driven by an electric actuator drive and having, at one of its ends, a magnet which is arranged in contactless alignment with a sensor which is arranged on the lid, said method comprising the steps of:
- providing the sensor with a first magnetoresistive sensor element and a second magnetoresistive sensor element, generating an approximately sinusoidal signal in the first magnetoresistive sensor element and an approximately cosinusoidal signal in the second magnetoresistive sensor element by means of the magnet when there is rotational movement of the butterfly valve shaft, feeding the first approximately sinusoidal signal and the second approximately cosinusoidal signal to evaluation electronics arranged in the sensor, generating an approximately arctan-shaped signal in the evaluation electronics from the approximately sinusoidal signal of the first magnetoresistive sensor element and the approximately cosinusoidal signal of the second magnetoresistive sensor element, generating a control signal as a function of the approximately arctan-shaped signal in a control unit arranged outside the housing, and feeding the control signal to the actuator drive arranged in the butterfly valve connecting piece in order to adjust the butterfly valve shaft.
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Accused Products
Abstract
The invention relates to a method for the contactless detection of the position of a butterfly-valve shaft of a butterfly valve connecting piece, the butterfly-valve shaft being driven by an electric actuator and having a magnet at one end, which is aligned in a contactless manner with a sensor that is located on a cover. An aim of the invention is to reliably guarantee the detection of the position of the butterfly-valve shaft, even over particularly long periods of time using a contactless position detection device. To achieve this, the sensor has a first and a second magnetoresistive sensor element, an approximately sinusoidal signal being generated in the first sensor element and an approximately cosinusodial signal being generated in the second sensor element by means of the magnet, during the rotation of the butterfly-valve shaft. According to the method, an approximately arc tangential signal is generated in the butterfly-valve connecting signal. The control signal is fed to the actuator that is located in the butterfly-valve connecting piece, to adjust the position of the butterfly-valve shaft.
54 Citations
11 Claims
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1. A method for contactless detection of a position of a butterfly valve shaft of a butterfly valve connecting piece, the butterfly valve connecting piece having a housing which can be closed off by a lid and a throttle orifice which is arranged in the housing, for a butterfly valve which is arranged on the butterfly valve shaft, the butterfly valve shaft being capable of being driven by an electric actuator drive and having, at one of its ends, a magnet which is arranged in contactless alignment with a sensor which is arranged on the lid, said method comprising the steps of:
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providing the sensor with a first magnetoresistive sensor element and a second magnetoresistive sensor element, generating an approximately sinusoidal signal in the first magnetoresistive sensor element and an approximately cosinusoidal signal in the second magnetoresistive sensor element by means of the magnet when there is rotational movement of the butterfly valve shaft, feeding the first approximately sinusoidal signal and the second approximately cosinusoidal signal to evaluation electronics arranged in the sensor, generating an approximately arctan-shaped signal in the evaluation electronics from the approximately sinusoidal signal of the first magnetoresistive sensor element and the approximately cosinusoidal signal of the second magnetoresistive sensor element, generating a control signal as a function of the approximately arctan-shaped signal in a control unit arranged outside the housing, and feeding the control signal to the actuator drive arranged in the butterfly valve connecting piece in order to adjust the butterfly valve shaft. - View Dependent Claims (2, 3)
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4. A butterfly valve connecting piece, comprising:
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a housing having walls defining a cavity and an opening;
a lid arranged on said housing to close off said opening;
a butterfly valve shaft comprising a magnet at one end, said magnet having an approximately ring-shaped design;
a butterfly valve arranged on said butterfly shaft;
a throttle orifice for said butterfly valve, said orifice arranged within said housing, an electric actuator device for driving said shaft, said actuator device connected to said shaft;
a sensor in contactless alignment with said magnet, said sensor comprising a first magnetoresistive sensor element and a second magnetoresistive sensor element such that an approximately sinusoidal signal is generated in the first magnetoresistive sensor element and an approximately cosinusoidal signal is generated in the second magnetoresistive sensor element when there is a rotary movement of the butterfly valve shaft, the first and second sensor elements comprising means for generating an arctan-shaped signal;
a control unit arranged outside of the housing; and
evaluation electronics electronically coupled with the first and second sensor elements and the control unit so as to generate a control signal for the actuator drive within the control unit. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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Specification