Source: http://www.google.es/patents/US9602122
Timestamp: 2018-01-17 07:33:48
Document Index: 161921010

Matched Legal Cases: ['art 2', 'art 3', 'art 3', 'art 1', 'art 2', 'art 1', 'art 2', 'Application No. 13771343', 'application No. 07838659', 'Application No. 12780913', 'Application No. 12713813', 'Application No. 2009530377', 'Application No. 07838659', 'art 4', 'art 4', 'Application No. 2013323856', 'Application No. 2', 'Application No. 2', 'Application No. 200780030039', 'Application No. 2009', 'Application No. 07836452', 'Application No. 13771343', 'Application No. 2010', 'Application No. 2010', 'Application No. 2014', 'Application No. 2015115909', 'Application No. 201110303797', 'Application No. 2007800357356', 'application No. 2007800357356', 'art 4', 'application No. 2009530377', 'Application No. 07838659', 'Application No. 07836452']

Patente US9602122 - Process variable measurement noise diagnostic - Google Patentes
A process variable transmitter, includes an analog-to-digital (A/D) converter that receives a sensor signal provided by a sensor that senses a process variable and converts the sensor signal to a digital signal. A processor receives the digital signal and provides a measurement output indicative of the...http://www.google.es/patents/US9602122?utm_source=gb-gplus-sharePatente US9602122 - Process variable measurement noise diagnostic
Número de publicación US9602122 B2
Número de solicitud US 13/631,048
También publicado como CA2886533A1, CN103712707A, CN103712707B, CN203148583U, EP2901226A1, US20140095095, WO2014052232A1
Número de publicación 13631048, 631048, US 9602122 B2, US 9602122B2, US-B2-9602122, US9602122 B2, US9602122B2
Inventores Jason Harold Rud, Loren Michael Engelstad
Citas de patentes (553), Otras citas (197), Clasificaciones (4), Eventos legales (1)
US 9602122 B2
a noise detector that receives the sensor signal at a refresh rate that is greater than the conversion rate, and generates a first value indicative of a number of positive noise events relative to a positive threshold value, and a second value indicative of a number of negative noise events relative to a negative threshold value, the processor evaluating the positive noise events and the negative noise events and generating a noise output that is indicative of detected noise based on the first and second values,
wherein the noise detector comprises:
a noise detector that receives the process temperature sensor signal and generates, during conversion of the process temperature sensor signal to the digital signal at a refresh rate that is greater than the conversion rate, a first count value indicative of a number of positive noise events relative to a positive threshold value and a second count value indicative of a number of negative noise events relative to a negative threshold value, the processor generating a noise output that is indicative of a characteristic of detected noise based on the first and second count values,
Prior to describing the operation illustrated in FIG. 5, the elements of FIG. 4 will first be briefly discussed. Vinput in FIG. 4 is the input voltage developed across sensor 18 (in FIG. 3) and applied between leads 40 and 42. Vinput _ latched is the voltage across capacitor C1 (again in FIG. 3) when switch S1 is closed. Vos _ thresh is a voltage set point that is used by positive and negative threshold generators 60 and 62 to generate positive and negative thresholds (Vpos _ adjust and Vneg _ adjust). In the embodiment shown, the threshold generators are comprised of a set of summing nodes 60 and 62. Vinput _ latched is added to noise threshold Vos _ thresh at summing node 60 and Vos _ thresh is subtracted from Vinput _ latched at summing node 62. It should also be noted that the noise threshold Vos _ thres can be determined empirically or it can vary from implementation-to-implementation. Similarly, two different thresholds could be used to generate Vpos _ adjust and Vneg _ adjust. In one embodiment, the value(s) of Vos _ thresh is set in firmware or at manufacturing time so the user need not set it or adjust it. Further, it can be adjustable by the user and the decision as to the particular threshold voltage can be made during implementation. Also, the threshold values can be variable based on a variety of different parameters, such as the value of the sensor signal, or other parameters.
The resultant positive and negative threshold voltages (Vpos _ adjust and Vneg _ adjust) are provided to comparators 64 and 66 where they are compared with Vinput. The output of comparators 64 and 66 are provided to the input of counters 68 and 70, respectively, which receive a clock input from clock 72. When Vinput exceeds Vpos _ adjust in the positive direction, and when clock 72 provides a clock pulse, counter 68 will increment by one. Similarly, when Vinput exceeds Vneg _ adjust in the negative direction, and when clock 72 provides a clock pulse to counter 70, then counter 70 will increment by one. In essence, during every clock cycle of clock 72, the output of comparators 64 and 66 are evaluated and noise registers (or counters) 68 and 70 are used to accumulate counts corresponding to both positive and negative noise events if the positive and negative noise threshold voltages (Vpos _ adjust and Vneg _ adjust) are exceeded. Refresh counter 73 is also clocked by clock 72 and provides a method to refresh Vinput _ latch at a predetermined rate. The refresh counter counts up to the refresh period where it refreshes the voltage latched across capacitor C1 at a refresh rate based on the output from counter 73.
In any case, once Vinput is latched across capacitor C1, summing nodes 60 and 62 generate the positive and negative threshold voltages Vpos _ adjust and Vneg _ adjust which are applied to comparators 64 and 66. As briefly mentioned above, when Vinput exceeds Vpos _ adjust in the positive direction, then counter 68 is incremented for each clock cycle of clock 72. Similarly, when Vinput exceeds the negative threshold Vneg _ adjust in the negative direction, then counter 70 is incremented for each clock cycle of clock 72. Testing the positive and negative noise output and incrementing counters 68 and 70, as needed, is indicated by block 86 in FIG. 5. After each clock cycle, it is determined whether refresh counter 73 has reached a count value that indicates that the latched voltage Vinput _ latched should be refreshed. If so, processing reverts to block 82 where refresh counter 73 is set to zero. Making the determination of whether the refresh counter is to be reset is indicated by block 88 in FIG. 5.
Yet another noise characteristic is the noise level. The noise level can be estimated by the quantity of counts output by counters 68 and 70, and the selected voltage threshold level Vos _ thresh. The threshold level may be adjusted to provide information to processor 24, and ultimately to the user, as to how much noise exists in the system. This can be important when thermal electromotive forces (EMFs) are generated on RTD measurement lines. If connection points are corroded or frayed, and the temperature gradient exists across this connection, a dynamic EMF condition can be induced on the RTD measurement. In this case, the user can be made aware of this, so that they can perform maintenance on the measurement loop. Processor 24 can generate a message that informs the user of this maintenance need.
FIGS. 6-8 are plots of counters 68 and 70 along the x axis versus voltage along the y axis. FIGS. 6-8 illustrate some of the noise characteristics. In FIG. 6, Vinput is indicated by line 100 and Vpos _ adjust is indicated by line 102, while Vneg _ adjust is indicated by line 104. FIG. 6 illustrates what might be a reflection of normal measurement noise. That is, Vinput varies well within the thresholds established by threshold voltages 102 and 104. It can be seen that the output from counters 68 and 70 are both zero, because Vinput has not crossed either threshold 102 or 104 during the measurement cycle.
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Clasificación internacional G05B23/02, H03M1/10
Clasificación cooperativa H03M1/1071, G05B23/0221
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