Method for detecting the operational readiness of a jump lambda sensor

一种运行准备、探测器的技术，应用在仪器、机械设备、测量装置等方向，能够解决识别滞后等问题

Active Publication Date: 2013-08-07
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the consideration of these additional criteria further delays the identification of the detector's operational readiness, with consequent disadvantages in terms of exhaust gas aftertreatment and resulting emissions.

Method used

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  • Method for detecting the operational readiness of a jump lambda sensor

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Embodiment Construction

[0027] The method according to the invention uses the internal resistance of the step lambda detector as a criterion for recognizing that the detector is ready for operation. There is a clear correlation between the detector internal resistance and the detector element temperature, wherein the detector element temperature exceeds a certain temperature threshold when the detector internal resistance simultaneously falls below a corresponding resistance threshold. The operational readiness of the detector is reached when the internal resistance of the detector falls below a certain threshold value. According to the invention, the internal resistance of the probe is already measured before the probe is ready for operation. The attainment of the operational readiness of the detector can be detected without delay only by measuring before the operational readiness of the detector. The internal resistance of the detector is measured by applying a pulsating current to the detector. ...

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Abstract

In a method for detecting the operational readiness of a jump lambda sensor associated with an internal combustion engine the internal resistance of the sensor is determined as the criterion for the operational readiness of the sensor. The internal resistance is measured by applying a pulsed current to the sensor, the frequency of the current being selected as a function of the state of the sensor (1, 2, 3, 4).

Description

technical field [0001] The invention relates to a method for detecting the operational readiness of a step lambda detector, wherein the internal resistance of the detector is measured as a criterion for the operational readiness of the detector. Background technique [0002] In order to detect the oxygen concentration in the exhaust gas of the internal combustion engine, lambda sensors are used in modern motor control systems. The oxygen concentration in the exhaust gas of the internal combustion engine is determined by means of a lambda probe, so that the air supply and the fuel supply of the internal combustion engine can be regulated via the lambda control loop in such a way that exhaust gas aftertreatment of the catalytic converter arranged in the exhaust gas duct of the internal combustion engine can achieve a optimal composition. [0003] Different forms of lambda detectors are disclosed. For a two-point lambda detector, which is also called a stepped lambda detector...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14
CPCG01M15/104F02D41/1455F02D41/1496Y02T10/40
Inventor M.费伊
Owner ROBERT BOSCH GMBH
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