Robert Boschgmbh

Robert Bosch Tool Corporation

Ramaswamy, Bharadwaja Maharshi

Srikantiah, Vishwanatha Manevarthe

Vishwanatha Manevarthe Srikantiah

Bharadwaja Maharshi Ramaswamy

Niranjan Sathyanarayanarao Krishnarao

Sai Yogesh Kumar Mangapuram

Yeshwanth Sampangi Ramaiah

A power tool () includes a moving implement () and an ultrasonic transducer () that emits ultrasonic signals and receives echo return signals from an object () that reflects the ultrasonic signals. A controller () identifies a distance between the implement and the object and identifies a type of the object based on the echo return signals from the object. The controller activates an implement arrest mechanism () in response to the distance between the object and the ultrasonic transducer being less than a predetermined threshold and the type of the object corresponding to a portion of a human body.

Power tool with ultrasonic sensor for sensing contact between an implement and an object

A power tool includes a moving implement, implement arrest mechanism, light emitters, photodetector, and controller. The controller activates a first emitter to direct light with a wavelength between 800 nm and 1100 nm on an object and identifies a first reflectance level of the object from a reflectance signal from the photodetector. The controller activates a second emitter to direct light with a wavelength between 1350 nm and 1800 nm on the object and identifies a second reflectance level of the object from the photodetector. The controller activates the implement arrest mechanism to prevent contact between the object and the moving implement if a ratio corresponding to the first identified reflectance level and the second identified reflectance level exceeds a predetermined threshold.

Skin sensing using spectral analysis

A method of operating a power tool identifies motion of an implement in a power tool. The method includes obtaining a plurality of samples of an electrical signal that passes through the implement, identifying a parameter for the plurality of samples corresponding to a variation in values of predetermined groups of samples in the plurality of samples, updating a status for the implement with a first status indicating that the implement is not moving with reference to the identified parameter being less than a predetermined threshold, and updating a status for the implement with a second status indicating that the implement is moving with reference to the identified parameter being greater than the predetermined threshold.

System and method for identification of implement motion in a power tool

A method for detection of false positive condition that an object is in contact with an implement in a power tool includes sampling an electrical signal received from the implement, identifying in-phase and a quadrature components of the sampled electrical signal, identifying a magnitude of each of the samples with reference to the in-phase component and the quadrature component for the samples, detecting an object approaching the implement with reference to the plurality of samples, identifying a signal-to-noise ratio for the samples, and identifying a false positive condition for the detected object with reference to the identified signal-to-noise ratio for the identified samples.

System and method for reducing false positive detection between a human and a moving implement in a power tool

A method of operating a power tool detects human contact with a non-moving implement in the power tool. The method includes generating a series of samples of an electrical signal passing through the non-moving implement, identifying a component for each sample in the series of samples of the electrical signal, identifying a first max&#x2212;min value corresponding to a first plurality of samples in the series of samples occurring during a first periodic time interval with reference to a difference between a maximum value and a minimum value identified in the components of the first plurality of samples, and identifying human contact with the non-moving implement in response to the first max&#x2212;min value being greater than a first predetermined threshold.

System and method for identification of contact between a human and a static implement in a power tool

A method for operating a power tool detects human contact with a non-moving implement of the power tool. The method includes sampling an electrical signal that passes through the non-moving implement, identifying in-phase and quadrature phase components for the sample, identifying a first distance between the components of the sample and a centroid of a cluster of samples corresponding to human contact with the non-moving implement, identifying a second distance between the components of the sample and a second centroid identified for another cluster of samples corresponding to no human contact with the non-moving implement, and identifying human contact with the non-moving implement with reference to the first distance being less than the second distance.

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Bengaluru, India

Vishwanatha Manevarthe Srikantiah