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Controller and abnormality detection method for air-fuel ratio sensor

An air-fuel ratio sensor and controller technology, applied in electrical control, engine control, instruments, etc., can solve the problem of increased load and achieve the effect of reducing load

Active Publication Date: 2020-04-10
FUJITSU GENERAL LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when the voltage state of the terminal connected to the gas sensor element is sampled at predetermined time intervals to detect abnormalities such as ground faults or sky faults, the load for detecting abnormalities becomes large

Method used

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  • Controller and abnormality detection method for air-fuel ratio sensor
  • Controller and abnormality detection method for air-fuel ratio sensor
  • Controller and abnormality detection method for air-fuel ratio sensor

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Embodiment Construction

[0016] Hereinafter, one embodiment of a controller and an abnormality detection method of an air-fuel ratio sensor (A / F sensor) will be described in detail with reference to the accompanying drawings. Furthermore, the disclosed technology is not limited to the embodiments described below.

[0017] 1. Configuration of air-fuel ratio sensor

[0018] figure 1 is a diagram showing a configuration example of an air-fuel ratio sensor according to an embodiment of the present disclosure. Such as figure 1 As shown, an air-fuel ratio sensor 100 includes a gas sensing element 1 and a controller 2 to detect, for example, an oxygen concentration (air-fuel ratio) in exhaust gas.

[0019] The gas sensor element 1 includes a pump unit 4 for pumping oxygen into and out of a gas detection chamber (not shown), and a detection unit 5 for detecting the oxygen concentration of the gas detection chamber. The controller 2 includes a terminal Tip, a terminal Tcom, a terminal Tvs, a control unit 1...

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Abstract

A controller (2) of an air-fuel-ratio sensor (100) includes a control unit (10), a voltage-abnormality detecting unit (20), and a short-circuit-abnormality detecting unit (30). The control unit (10) controls a current and a voltage of a gas sensor element (1) through a plurality of terminals (T) connected with the gas sensor element (1). The voltage-abnormality detecting unit (20) changes, when at least one of voltages of the plurality of terminals (T) is out of a predetermined range, a voltage level of an output voltage (Vo). The short-circuit-abnormality detecting unit (30) causes, when the voltage level of the output voltage (Vo) changes from a first voltage into a second voltage, a control unit (10) to perform for a predetermined time a protective operation that suppresses currents from the control unit (10) to the plurality of terminals (T), and detects, when the voltage level of the output voltage (Vo) is the second voltage after the protective operation is released, a short-circuit abnormality.

Description

technical field [0001] Embodiments discussed herein relate to a controller and an abnormality detection method of an air-fuel ratio sensor. Background technique [0002] There is known a feedback control which brings the air-fuel ratio (which is the ratio of air to fuel in the exhaust gas discharged from the internal combustion engine) close to the target air-fuel ratio in order to improve the fuel efficiency of the vehicle, and the air-fuel ratio is determined by the air-fuel ratio sensor (A / F sensor) detection. [0003] As for the air-fuel ratio sensor, there is known an air-fuel ratio sensor that controls current and voltage of a plurality of terminals connected to a gas sensor element in order to detect the air-fuel ratio. Regarding this air-fuel ratio sensor, there is proposed a technique of detecting abnormalities such as ground fault and sky fault of the terminals connected to the gas sensor element based on the voltage of these terminals (for example, JP-A 2005 -29...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02G01R19/00G01R31/52
CPCF02D41/1454F02D41/1495F02D2041/2093G01R31/52F01N11/007F02D41/1402F02D41/1456G01D3/028G01D3/08
Inventor 渡边将利梅山重人小宫基树木户启介森崎知治三浦广土
Owner FUJITSU GENERAL LTD