US 9,810,734 B2
Compound sensor including a plurality of detection elements and a plurality of fault detection circuits
Daisuke Maeda, Tokyo (JP); Ichiroh Ohsaka, Ibaraki (JP); and Masahide Hayashi, Ibaraki (JP)
Assigned to Hitachi Automotive Systems, Ltd., Hitachinaka-shi (JP)
Appl. No. 14/764,067
Filed by Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki (JP)
PCT Filed Nov. 19, 2013, PCT No. PCT/JP2013/081204
§ 371(c)(1), (2) Date Jul. 28, 2015,
PCT Pub. No. WO2014/119092, PCT Pub. Date Aug. 7, 2014.
Claims priority of application No. 2013-018038 (JP), filed on Feb. 1, 2013.
Prior Publication US 2016/0011254 A1, Jan. 14, 2016
Int. Cl. G01R 31/28 (2006.01); G01C 19/5726 (2012.01); G01P 15/125 (2006.01); G01P 15/18 (2013.01); G01C 19/5776 (2012.01); G01P 21/00 (2006.01); G01R 31/02 (2006.01); G01P 15/08 (2006.01)
CPC G01R 31/2829 (2013.01) [G01C 19/5726 (2013.01); G01C 19/5776 (2013.01); G01P 15/125 (2013.01); G01P 15/18 (2013.01); G01P 21/00 (2013.01); G01R 31/025 (2013.01); G01P 2015/0814 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A compound sensor for detecting a plurality of physical quantities, the compound sensor comprising:
a plurality of detection elements;
a plurality of signal detection circuits provided for processing signals received from the plurality of detection elements;
a power source shared among each of the plurality of detection elements; and
a plurality of fault detection circuits provided for each of the plurality of detection elements for detecting a fault of each detection element and stopping power supply to a faulty detection element;
wherein the plurality of fault detection circuits detect fault occurrence by detecting when a current in the faulty detection element is not at a predetermined value or when the current is larger than a threshold;
wherein the signal detection circuits includes a low-pass filter for removing noise; and
wherein a response time from detection of a fault of each detection element to stop of power supply to the detection element in which the fault has occurred in each of the plurality of signal detection circuits is shorter than a time constant of the low-pass filter.