公开(公告)号：US20150219590A1

公开(公告)日：2015-08-06

申请号：US14607447

申请日：2015-01-28

Applicant: DENSO CORPORATION

Inventor： Shinya UEMURA ,  Yusuke SHIMIZU

IPC: G01N27/407

CPC classification number: G01N27/407 ,  F02D41/1454 ,  F02D41/28 ,  F02D2041/286

Abstract: An air-fuel ratio detection device includes a resistor, a first voltage application section, a second voltage application section, an amplification section, an A/D conversion section, and an arithmetic section. The first voltage application section applies a direct current voltage to a first end of a series circuit constituted of an air-fuel ratio sensor and the resistor. The amplification section amplifies a voltage across the resistor and outputs an amplified voltage as an output voltage. The A/D conversion section carries out an A/D conversion of the output voltage every time before the second voltage application section switches a voltage applied to a second end of the series circuit between a first voltage and a second voltage. The arithmetic section calculates a sensor current and an impedance of the air-fuel ratio sensor using two consecutive A/D conversion results by the A/D conversion section.

Abstract translation: 空燃比检测装置包括电阻器，第一电压施加部分，第二电压施加部分，放大部分，A / D转换部分和运算部分。 第一电压施加部分将直流电压施加到由空燃比传感器和电阻器构成的串联电路的第一端。 放大部分放大电阻两端的电压，并输出放大的电压作为输出电压。 A / D转换部分在第二电压施加部分在第一电压和第二电压之间切换施加到串联电路的第二端的电压之前每次执行输出电压的A / D转换。 运算部使用A / D转换部的两个连续A / D转换结果来计算空燃比传感器的传感器电流和阻抗。

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.