Verification module and method for validity of concentration sensor, controller and machine readable storage medium

A concentration sensor and verification module technology, which is applied in the field of concentration sensor validity verification module, controller and machine-readable storage medium, can solve the problems of non-existence of self-test function and inability to ensure validity, and achieve the goal of ensuring accuracy Effect

Active Publication Date: 2021-03-30
ROBERT BOSCH GMBH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current concentration sensor does not have a self-test function to ensure its effectiveness

Method used

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  • Verification module and method for validity of concentration sensor, controller and machine readable storage medium
  • Verification module and method for validity of concentration sensor, controller and machine readable storage medium

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Embodiment Construction

[0021] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and the exemplary embodiments shown in the drawings. It should be understood that the specific embodiments described here are only used to explain the principles of the present invention, rather than to limit the protection scope of the present invention.

[0022] figure 1 It shows an SCR system used in a vehicle, especially a diesel engine vehicle, according to an embodiment of the present application, which is associated with the exhaust pipe 10 of the vehicle engine, and is used for injecting exhaust treatment fluid into the exhaust pipe 10 to reduce NOx content in exhaust gas. The SCR system mainly includes a liquid storage tank 20 , a supply unit 30 and a metering injection unit 40 . A catalyst (not shown) of the SCR...

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Abstract

The invention provides a verification module and method for verifying the validity of a concentration sensor for measuring the concentration of an exhaust treatment liquid in a liquid storage tank ofa vehicle SCR system. The concentration sensor and a liquid level sensor are arranged in the liquid storage tank, and the verification module comprises a processor, wherein the processor is configuredto be used for judging that the concentration sensor is valid when the actual liquid level is within the allowable range of the default liquid level and the actual concentration is within the allowable range of the default concentration; and calculating an actual change factor based on the actual concentration and based on an adaptive algorithm of the default concentration, a default change factor and a change factor when the actual liquid level is larger than a maximum value of the allowable range of the default liquid level, and when the calculated actual change factor is within the allowable range of a standard change factor, judging that the concentration sensor is valid. The invention further provides a controller storing an executable instruction capable of executing the above method when executed and a machine readable storage medium.

Description

technical field [0001] The present application relates to a verification module and a corresponding verification method for the effectiveness of a concentration sensor used to measure the concentration of exhaust gas treatment liquid used in the SCR (Selective Catalytic Reduction) system of a vehicle, especially a diesel engine vehicle, and also relates to a device stored when A controller and a machine-readable storage medium of executable instructions capable of performing the above method when executed. Background technique [0002] In order to reduce the NOx content in vehicle engine exhaust, vehicles are generally equipped with SCR systems, which are configured to inject exhaust treatment fluid into vehicle exhaust, and use selective catalytic reduction technology to reduce NOx in exhaust gas to harmless nitrogen, components such as water and carbon dioxide. The SCR system includes a liquid storage tank containing the exhaust gas treatment fluid, a metering injection u...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N11/00F01N13/00
CPCF01N11/00F01N3/2066F01N3/208F01N13/00Y02T10/12Y02T10/40Y02A50/20
Inventor 刘毅
Owner ROBERT BOSCH GMBH
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