US 11,852,092 B2
Electric current detection apparatus
Kouki Ojima, Kariya (JP); Satoshi Sakai, Kariya (JP); Toshihisa Habiro, Kariya (JP); and Yuta Kawai, Kariya (JP)
Assigned to AISIN CORPORATION, Aichi (JP)
Filed by AISIN CORPORATION, Aichi (JP)
Filed on Jul. 26, 2021, as Appl. No. 17/385,274.
Claims priority of application No. 2020-138493 (JP), filed on Aug. 19, 2020.
Prior Publication US 2022/0056863 A1, Feb. 24, 2022
Int. Cl. F02D 41/20 (2006.01); H01F 7/18 (2006.01); G01R 31/72 (2020.01); G01R 31/28 (2006.01)
CPC F02D 41/20 (2013.01) [H01F 7/18 (2013.01); F02D 2041/2027 (2013.01); F02D 2041/2055 (2013.01); G01R 31/2829 (2013.01); G01R 31/72 (2020.01)] 8 Claims
OG exemplary drawing
 
1. An electric current detection apparatus, the electric current detection apparatus being configured to detect an electric current flowing in a solenoid configured to be electrified by a PWM control, the electric current detection apparatus comprising:
a switch configured to be switched from either one of an open state and a closed state to the other by the PWM control;
an electric current value detection portion configured to detect a first electric current value, the first electric current value being an electric current value of the electric current at a first timing corresponding to a timing when the switch transitions from the closed state to the open state;
the electric current value detection portion configured to detect a third electric current value, the third electric current value being an electric current value of the electric current at a third timing, the third timing being a timing when a first time period has passed from a second timing corresponding to a timing at which the switch transitions from the open state to the closed state and which is immediately prior to the first timing, the third timing occurring between the second timing and the first timing, the first time period being set in advance; and
a second electric current value calculation portion configured to calculate a second electric current value on the basis of the first electric current value and the third electric current value, the second electric current value being an electric current value of the electric current at the second timing.