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公开(公告)号：US10161338B2
公开(公告)日：2018-12-25
申请号：US15674642
申请日：2017-08-11
Applicant: DENSO CORPORATION
Inventor： Satoshi Nishimoto
Abstract: An air-fuel ratio sensor control unit connected with an air-fuel ratio sensor including a common terminal, a first terminal and a second terminal includes a common connection terminal connected with the common terminal, a first connection terminal connected with the first terminal, a second connection terminal connected with the second terminal, a voltage control circuit controlling a voltage of the first connection terminal, a resistor connected with the common connection terminal, a voltage sensing circuit sensing a two-end voltage of the resistor, a current applying circuit applying a constant current to the second connection terminal, and a determining unit sensing a change quantity of the two-end voltage by using the voltage sensing circuit and determining whether a disconnection failure of the first connection terminal occurs based on a sensing result of the change quantity.
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公开(公告)号：US09537300B2
公开(公告)日：2017-01-03
申请号：US14479396
申请日：2014-09-08
Applicant: DENSO CORPORATION
Inventor： Satoshi Nishimoto , Toru Itabashi , Yuki Mikami , Ryoichi Shiraishi
Abstract: A load driving device includes a driving switching element, an interrupting part, a short-circuiting switching element, and a protecting element. The driving switching element drives a load by controlling energization to the load. The interrupting part is disposed on an energizing path to the load. The interrupting part is not melted by a driving current to the load and is melted by an interrupting current larger than the driving current so as to interrupt energization to the load. The short-circuiting switching element is connected in parallel with the load and applies the interrupting current to the interrupting part. The protecting element protects the short-circuiting switching element.
Abstract translation: 负载驱动装置包括驱动开关元件，中断部分，短路开关元件和保护元件。 驱动开关元件通过控制对负载的通电来驱动负载。 中断部分设置在通向负载的通电路径上。 中断部分不被驱动电流熔化到负载并且被大于驱动电流的中断电流熔化，从而中断对负载的通电。 短路开关元件与负载并联连接，并将中断电流施加到中断部分。 保护元件保护短路开关元件。
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公开(公告)号：US10921214B2
公开(公告)日：2021-02-16
申请号：US16016811
申请日：2018-06-25
Applicant: DENSO CORPORATION
Inventor： Nobuyuki Tanaka , Hiroki Kakui , Yuji Iwama , Satoshi Nishimoto
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.
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公开(公告)号：US10048240B2
公开(公告)日：2018-08-14
申请号：US14849910
申请日：2015-09-10
Applicant: DENSO CORPORATION
Inventor： Satoshi Nishimoto , Masafumi Umeno , Yuji Yamada
Abstract: A control apparatus that controls a gas concentration sensor includes a sweep circuit, a current detection resistor, and a calculation portion. The sweep circuit supplies the gas concentration sensor with a sweep current. The calculation portion calculates impedance of the gas concentration sensor. The gas concentration sensor and the current detection resistor are sequentially connected in series along a direction from the sweep circuit to a reference voltage. The sweep circuit has a constant voltage circuit and a reference resistor. An increasing and decreasing tendency of a manufacturing variation of the reference resistor and an increasing and decreasing tendency of a manufacturing variation of the current detection resistor are identical. The calculation portion divides a product of a resistance value of the current detection resistor and a time variation of applied voltage to the gas concentration sensor by a time variation of applied voltage to the current detection resistor.
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