公开(公告)号：US20190017901A1

公开(公告)日：2019-01-17

申请号：US16016811

申请日：2018-06-25

Applicant: DENSO CORPORATION

Inventor： Nobuyuki TANAKA ,  Hiroki KAKUI ,  Yuji IWAMA ,  Satoshi NISHIMOTO

IPC: G01M15/10

Abstract: An air-fuel ratio (A/F) sensor control device includes: an impedance detector detecting an impedance of an A/F sensor; and a pump current controller performing a digital control on a supply of electric current to the A/F sensor. The pump current controller includes a PID calculator calculating an instruction current value according to a difference of two input values, i.e., the difference between a PID control target value and a detection value of an inter-terminal voltage of a Nernst cell; and a protection clamper limiting a supply of electric current to a pump cell based on the instruction current value and the impedance. The protection clamper includes: a current clamp threshold calculator calculating an upper limit value and a lower limit value of the electric current based on the impedance of the Nernst cell, a first current value limiter limiting the instruction current value by the upper limit value and the lower limit value, and a second current value limiter performing a constant current limitation on an instruction current limit value by using an instruction constant current value.

公开(公告)号：US20210381457A1

公开(公告)日：2021-12-09

申请号：US17339065

申请日：2021-06-04

Applicant: DENSO CORPORATION

Inventor： Masashi INABA ,  Yusuke SHIMIZU ,  Hiroki KAKUI

IPC: F02D41/20 ,  F02D41/30

Abstract: An injection control device includes: a boost controller performing a boost switching control of a boost switch to charge a boost capacitor and supplying a boost power from a battery power supply; a boost voltage monitor monitoring the boost voltage; and a boost monitor timing controller setting a section from a predetermined time after an on-edge of the boost switch to an off-edge timing in a section monitor mode as a boost monitor section. The boost controller stops boosting by stopping the boost switching control when the boost voltage is equal to or higher than a boost stop threshold value in the boost monitor section.