Physical quantity sensor

Patent metadata

Field	Value
Publication number	US-9885586-B2
Application number	US-201314422375-A
Country	US
Kind code	B2
Filing date	Aug 21, 2013
Priority date	Aug 22, 2012
Publication date	Feb 6, 2018
Grant date	Feb 6, 2018

Abstract

A physical quantity sensor includes a detection circuit that outputs a detection value indicating a physical quantity applied to a detecting element and a correction processor that corrects the detection value to output a corrected value. The correction processor causes the corrected value to be substantially 0 (zero) if all of conditions that an absolute value of a time-differentiated value of the detection value is not larger than a predetermined differential threshold and that an absolute value of the corrected value is not larger than a predetermined output threshold are satisfied. This physical quantity sensor prevents the output signal from changing due a temperature change in spite of a small number of components.

First claim

The invention claimed is:

1. A physical quantity sensor comprising:
a detection circuit;
a first circuit that has a first output signal input thereto from the detection circuit; and
a second circuit that has the first output signal input thereto from the detection circuit and has a second output signal input thereto from the first circuit,
wherein the second circuit outputs a third output signal to the first circuit,
wherein the first circuit includes a third circuit and a fourth circuit,
wherein the first output signal is input to the third circuit, and the third output signal is input to the fourth circuit, and
wherein the detection circuit outputs a signal supplied from a sensor configured to have a physical quantity applied thereto.

2. The physical quantity sensor according to claim 1 , wherein the second circuit includes a subtracter.

3. The physical quantity sensor according to claim 2 ,
wherein the third circuit includes a differential judgment section,
wherein the fourth circuit includes a window comparator,
wherein the first circuit further includes an AND processor and an updating buffer,
wherein an output from the differential judgment section and an output from the window comparator are input to the AND processor,
wherein an output signal from the AND processor is input to the updating buffer, and
wherein an output from the updating buffer is input to the second circuit.

4. The physical quantity sensor according to claim 1 ,
wherein the third circuit includes a differential judgment section,
wherein the fourth circuit includes a window comparator, and
wherein the physical quantity sensor is configured to cause the first output signal from the detection circuit to be substantially 0 (zero) if an output signal from the differential judgment section is within a first predetermined range and the third output signal input to the window comparator is within a second predetermined range.

5. A physical quantity sensor comprising:
a detection circuit;
a first circuit that has a first output signal input thereto from the detection circuit; and
a second circuit that has the first output signal input thereto from the detection circuit and has a second output signal input thereto from the first circuit,
wherein the second circuit outputs a third output signal to the first circuit,
wherein the first circuit includes a third circuit and a fourth circuit,
wherein the first output signal is input to the third circuit, and the third output signal is input to the fourth circuit, and
wherein the second circuit includes a subtracter.

6. The physical quantity sensor according to claim 5 ,
wherein the third circuit includes a differential judgment section,
wherein the fourth circuit includes a window comparator,
wherein the first circuit further includes an AND processor and an updating buffer,
wherein an output from the differential judgment section and an output from the window comparator are input to the AND processor,
wherein an output signal from the AND processor is input to the updating buffer, and
wherein an output from the updating buffer is input to the second circuit.

7. The physical quantity sensor according to claim 5 ,
wherein the third circuit includes a differential judgment section,
wherein the fourth circuit includes a window comparator, and
wherein the physical quantity sensor is configured to cause the first output signal from the detection circuit to be substantially 0 (zero) if an output signal from the differential judgment section is within a first predetermined range and the third output signal input to the window comparator is within a second predetermined range.

8. A physical quantity sensor comprising:
a detection circuit;
a first circuit that has a first output signal input thereto from the detection circuit; and
a second circuit that has the first output signal input thereto from the detection circuit and has a second output signal input thereto from the first circuit,
wherein the second circuit outputs a third output signal to the first circuit,
wherein the first circuit includes a third circuit and a fourth circuit,
wherein the first output signal is input to the third circuit, and the third output signal is input to the fourth circuit,
wherein the third circuit includes a differential judgment section,
wherein the fourth circuit includes a window comparator, and
wherein the physical quantity sensor is configured to cause the first output signal from the detection circuit to be substantially 0 (zero) if an output signal from the differential judgment section is within a first predetermined range and the third output signal input to the window comparator is within a second predetermined range.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Shimada Sho
• Sudo Ryota
• Murakami Hideyuki
• Ueda Shinjiro

Classifications

• G01P15/0888

  for indicating angular acceleration · CPC title

• G01P3/486

  delivered by photo-electric detectors · CPC title

• G01C19/5726

  Signal processing · CPC title

• G01C25/005 Primary

  initial alignment, calibration or starting-up of inertial devices · CPC title

• G01P21/00

  Testing or calibrating of apparatus or devices covered by the preceding groups · CPC title