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A nitrogen oxide sensor controller

A technology of nitrogen oxides and sensors, which is applied in the direction of instruments, scientific instruments, machines/engines, etc., can solve the problems of inability to measure various indicators efficiently and accurately, so as to improve cold start performance, service life and thermal shock resistance, and realize Accurately detect and filter out the effects of noise signals

Active Publication Date: 2020-08-28
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a nitrogen oxide sensor controller, which is used to solve the technical problem that the existing nitrogen oxide sensor controller cannot efficiently and accurately measure various indicators because the voltage control and current detection of each pump cannot be decoupled.

Method used

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  • A nitrogen oxide sensor controller
  • A nitrogen oxide sensor controller
  • A nitrogen oxide sensor controller

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Embodiment 1

[0050] A NOx sensor controller such as figure 1 As shown, including: heater resistance measurement circuit 45, the resistance measurement circuit where the heater is located (such as figure 2 shown), micro control unit 31, heating drive circuit 32, first, second and third pump current detection circuits (including the first pump current detection circuit 21, the second pump current detection circuit 22 and the third pump current detection circuit 23) , and the first, second and third pump voltage control circuits (including the first pump voltage control circuit 18, the second pump voltage control circuit 19 and the third pump voltage control circuit 20). in,

[0051] The heater resistance measurement circuit is used to receive the current signal generated by the micro control unit through the D / A port and apply it to the heater resistance measurement circuit, measure the loop current in the loop and the voltage across the heating plate in the nitrogen oxide sensor and It i...

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Abstract

The invention discloses a nitrogen oxide sensor controller. The nitrogen oxide sensor controller comprises a heater resistance measuring circuit, a micro-control unit, a heating driving circuit, a first pump current detection circuit, a second pump current detection circuit, a third pump current detection circuit, a first pump voltage control circuit, a second pump voltage control circuit and a third pump voltage control circuit. The sensor heater resistance is measured by the heater resistance measuring circuit, and the control and the detection of pumps are achieved by the three independentpump voltage control circuits and the three independent pump current detection circuits. A microcontroller conducts operation treatment on acquired heater resistance signals and acquired pump currentdetection signals, and heating control signals, pump voltage control signals, output oxygen concentration signals and nitrogen oxide concentration signals are obtained. By the adoption of the nitrogenoxide sensor controller, the accurate measurement of the heater resistance of a nitrogen oxide sensor is achieved, the temperature control accuracy of the sensor is improved, the control over pump units of the nitrogen oxide sensor and the accurate measurement of the pump current signals are achieved on this basis, and the accuracy of detection conducted by the nitrogen oxide sensor on the concentration of oxygen and the concentration of the nitrogen oxide in the automobile exhaust gas is improved.

Description

technical field [0001] The invention belongs to the field of after-treatment of automobile exhaust gas, and more specifically relates to a nitrogen oxide sensor controller. Background technique [0002] With the continuous upgrading of standards, the internal combustion engine industry has been unable to meet the requirements of both energy saving and emission reduction on the technical route. In order to save energy, the fuel utilization rate must be improved, and nitrogen oxides NOx are generated under high-temperature and oxygen-enriched conditions. People pay more and more attention to environmental pollution and harm to human health, and its concentration detection and emission control technology is currently the most cutting-edge and popular research field in the world. Nitrogen oxide NOx sensors are mainly divided into two categories based on zirconia solid electrolyte and metal oxide semiconductors in terms of materials, and metal oxide semiconductor materials are no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00G01N33/00
CPCF01N11/00F01N2560/026G01N33/0037G01N33/0073Y02T10/40
Inventor 李曦李怡蒋建华冯江涛王杰于洋曹昱洋
Owner HUAZHONG UNIV OF SCI & TECH
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