Patents Assigned to Schrader Electronics, Limited
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Patent number: 11321976Abstract: Methods and systems for adaptively configuring a tire mounted sensor (TMS) with vehicle-provided parameters are disclosed. A vehicle control unit obtains data from vehicle sensors and other sources and transmits configuration parameters to the TMS. The TMS signal processing components are configured according to the configuration parameter to minimize the number of tire rotations needed to generate an accelerometric profile and extract a tire feature. The extracted feature is transmitted back to the vehicle control unit with the aim of minimizing the computational resources and battery consumption of the TMS.Type: GrantFiled: November 6, 2019Date of Patent: May 3, 2022Assignee: SCHRADER ELECTRONICS LIMITEDInventors: Jonathan Wilgar, Alan C. Parks, William D. Stewart
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Patent number: 11247648Abstract: A tire monitoring device comprising a sensor for monitoring a tire parameter and a first controller for controlling the operation of the device. A measurement apparatus is provided for generating parameter measurement data from the sensor output signal. A second controller is provided for controlling the operation of the measurement apparatus. The second controller communicates parameter data to the first controller based on the measurement data. The device is particularly suited to monitoring tire pressure and detecting tire burst events.Type: GrantFiled: December 22, 2016Date of Patent: February 15, 2022Assignee: Schrader Electronics LimitedInventors: Darren Kirkpatrick, Jonathan Barr, Stephen Keyes
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Patent number: 11099091Abstract: A tire pressure monitoring system comprising a tire pressure monitoring device for mounting on an internal surface of a tire and including a pressure sensor for monitoring the fluid pressure in the tire. The system has an RFID tag located on the tire separately from the tire pressure monitoring device. In response to detecting a tire pressure event from monitoring the fluid pressure of said fluid, the tire pressure monitoring device causes the RFID to transmit data, which is received by the tire pressure monitoring device.Type: GrantFiled: December 22, 2016Date of Patent: August 24, 2021Assignee: Schrader Electronics LimitedInventors: William David Stewart, Christopher Arnold, Stephen Robb, Ian Elliott
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Patent number: 11034196Abstract: A method of locating a wheel-mounted electronic device, such as a tire pressure monitoring device. A wireless signal is transmitted from an interrogation device from each of a plurality of interrogation locations. The signals are received by the wheel-mounted device and received signal strength is measured for each interrogation location. The wheel-mounted device then transmits, in respect of each interrogation location, a wireless signal indicating the measured signal strength. These signals are received by the interrogation device which determines from them a location of the wheel-mounted device with respect to a wheel.Type: GrantFiled: October 31, 2018Date of Patent: June 15, 2021Assignee: SCHRADER ELECTRONICS LIMITEDInventors: William David Stewart, Alan Murphy, Stephen Robb
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Patent number: 10525780Abstract: A tire pressure monitoring device for a wheeled vehicle that is capable of detecting vehicle motion from the output of a pressure sensor. The device determines from the output signal an indication of the power of the signal, for example the variance of the signal, and detects if the vehicle is stationary or in motion depending on the determined indication of power. The device may determine that the vehicle is in motion if the determined indication of power exceeds a threshold value.Type: GrantFiled: December 22, 2016Date of Patent: January 7, 2020Assignee: SCHRADER ELECTRONICS LIMITEDInventors: Robert McKellar, Samuel Strahan, John Wilson
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Publication number: 20190329606Abstract: A method of determining an orientation of a tire mounted device with respect to a wheel rim using an acceleration sensor, With the wheel in a designated orientation and not rotating, a polarity of acceleration along a vertical axis is determined. Then it is determined which of a first absolute orientation or a second absolute orientation the tire mounted device is in depending on the determined polarity. The determined absolute orientation is correlated with the designated orientation to determine which of a first or second orientation with respect to the wheel rim the tire mounted device is in.Type: ApplicationFiled: January 1, 2019Publication date: October 31, 2019Applicant: Schrader Electronics LimitedInventors: William David Stewart, Stephen Robb
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Patent number: 9902215Abstract: A tire monitor for mounting on a wheel rim, the tire monitor comprising a housing having a first part (644A) configured to receive a component substrate (645) and a second part (644B) configured to receive one or more other components of the tire monitor, for example a battery. The first and second parts of the housing are non-coplanar and non-parallel with one another. When the tire monitor is mounted on the wheel rim, the substrate is non-coplanar and non-parallel with a plane (T) that is tangential to the wheel rim at the location where the tire monitor is mounted on the rim and preferably the substrate plane is substantially radial with respect to the wheel rim.Type: GrantFiled: April 10, 2013Date of Patent: February 27, 2018Assignee: Schrader Electronics LimitedInventors: Mark Duffy, Samuel Strahan, Philip Dorman, Emmanuel Marguet, Nicolas Henriet, Thomas Guillemin
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Patent number: 9778305Abstract: A tire monitoring apparatus comprising a monitor installed on a tire and a pulse width measuring apparatus for measuring the width of pulses produced by the monitor. The pulse width measuring apparatus comprises a frequency analyzer for producing a frequency representation of the pulse, a signal processor for determining a minimum value of the frequency representation, and a pulse width estimator that inverts the minimum value to produce a measurement for the pulse width. The tire monitoring apparatus uses the pulse width measurement as an indication of characteristics of the tire.Type: GrantFiled: January 30, 2014Date of Patent: October 3, 2017Assignee: Schrader Electronics LimitedInventors: Giovanni De Sanctis, William David Stewart, Stephen John Robb
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Patent number: 9399375Abstract: An apparatus for measuring parameter values from an electrical input signal comprises a signal sampling device operable to sample the input signal and to produce a corresponding output comprising a measured parameter value; a signal level detector configured to detect changes in the level of the input signal by more than a threshold amount; and a controller co-operable with the signal sampling device and the signal level detector. The controller is configured to operate the signal sampling device to sample the input signal in response to the signal level detector detecting a change in the input signal level by more than the threshold amount.Type: GrantFiled: November 13, 2012Date of Patent: July 26, 2016Assignee: Schrader Electronics LimitedInventors: Samuel Strahan, Gary Smith
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Publication number: 20150362542Abstract: A tyre monitoring apparatus comprising a monitor installed on a tyre and a pulse width measuring apparatus for measuring the width of pulses produced by the monitor. The pulse width measuring apparatus comprises a frequency analyzer for producing a frequency representation of the pulse, a signal processor for determining a minimum value of the frequency representation, and a pulse width estimator that inverts the minimum value to produce a measurement for the pulse width. The tyre monitoring apparatus uses the pulse width measurement as an indication of characteristics of the tyre.Type: ApplicationFiled: January 30, 2014Publication date: December 17, 2015Applicant: SCHRADER ELECTRONICS LIMITEDInventors: GIOVANNI DE SANCTIS, WILLIAM DAVID STEWART, STEPHEN JOHN ROBB
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Patent number: 9126459Abstract: An apparatus for determining the position and/or orientation of a tire mounted unit in a wheel monitoring system comprises a lateral force sensor that is responsive to forces exerted on the respective tire along a lateral axis that is parallel with an axle of the vehicle on which the tire is mounted. The lateral force sensor is arranged to produce an output signal that indicates the direction of the exerted forces. A controller determines the position and/or orientation of the tire unit depending on the exerted force direction indicated by the output signal.Type: GrantFiled: September 15, 2011Date of Patent: September 8, 2015Assignee: Schrader Electronics LimitedInventors: William David Stewart, Stephen John Robb
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Patent number: 8635906Abstract: A wheel monitoring system that includes a tracking filter apparatus for tracking a signal that has a varying main frequency. The tracking filter apparatus has an adjustable filter and a filter controller arranged to measure the amplitude of the filtered signal and to compare amplitude against a reference value. The filter controller adjusts the cut off frequency of the filter if the measured amplitude differs from the reference value by an amount that exceeds a threshold value. The filter controller adjusts the cut off frequency such that the main frequency lies within the roll off region of the filter's frequency response. The system may be used to track signals that are produced by shock sensors in a wheel mounted monitoring device.Type: GrantFiled: March 16, 2012Date of Patent: January 28, 2014Assignee: Schrader Electronics LimitedInventors: Samuel Strahan, Christopher Ainsworth
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Publication number: 20130207796Abstract: An apparatus for determining the position and/or orientation of a tyre mounted unit in a wheel monitoring system comprises a lateral force sensor that is responsive to forces exerted on the respective tyre along a lateral axis that is parallel with an axle of the vehicle on which the tyre is mounted. The lateral force sensor is arranged to produce an output signal that indicates the direction of the exerted forces. A controller determines the position and/or orientation of the tyre unit depending on the exerted force direction indicated by the output signal.Type: ApplicationFiled: September 15, 2011Publication date: August 15, 2013Applicant: Schrader Electronics LimitedInventors: William David Stewart, Stephen John Robb
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Publication number: 20120234087Abstract: A wheel monitoring system that includes a tracking filter apparatus for tracking a signal that has a varying main frequency. The tracking filter apparatus has an adjustable filter and a filter controller arranged to measure the amplitude of the filtered signal and to compare amplitude against a reference value. The filter controller adjusts the cut off frequency of the filter if the measured amplitude differs from the reference value by an amount that exceeds a threshold value. The filter controller adjusts the cut off frequency such that the main frequency lies within the roll off region of the filter's frequency response. The system may be used to track signals that are produced by shock sensors in a wheel mounted monitoring device.Type: ApplicationFiled: March 16, 2012Publication date: September 20, 2012Applicant: Schrader Electronics LimitedInventors: Samuel Strahan, Christopher Ainsworth
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Patent number: 7104123Abstract: An apparatus for detecting motion of a wheel comprising tyre. The apparatus comprises a pressure sensor for measuring the tyre pressure and generating a signal corresponding to the measured tyre pressure, and means for detecting a component of said signal that corresponds to, or is generated by, vibrations of the tyre. Upon detection of the signal component, the apparatus determines that the wheel is in motion. The detecting means may arranged to detect an audio signal component or signal components having a frequency in the range 200 Hz to 300 Hz.Type: GrantFiled: September 8, 2004Date of Patent: September 12, 2006Assignee: Schrader Electronics, LimitedInventors: William David Stewart, Samuel Kane Strahan, Alan Kenneth McCall
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Patent number: D725523Type: GrantFiled: March 6, 2014Date of Patent: March 31, 2015Assignee: Schrader Electronics LimitedInventor: Philip Dorman