A controller of wide-area oxygen sensor
An oxygen sensor and controller technology, applied in the direction of program control, computer control, general control system, etc., can solve the problems of unsuitable oxygen sensor and the general limitations of the controller.
Active Publication Date: 2019-05-21
NINGBO UNIV
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Problems solved by technology
This situation limits the versatility of the controller, that is, the controllers on the market are not suitable for the oxygen sensors produced by all manufacturers, and users must purchase oxygen sensors and corresponding controllers from a certain company.
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[0011] Example: such as figure 2As shown, a controller of a wide-area oxygen sensor includes a microprocessor 1, a pump current detection circuit 2, a DDS AC signal generation circuit 3, an oxygen concentration difference electromotive force measurement circuit 4, a comparison circuit 5, a heating drive circuit 6, a constant The current source circuit 7, the first resistor R1, the second resistor R2, the first capacitor C1, the second capacitor C2 and the third capacitor C3, the pump current detection circuit 2 has a first input terminal, a second input terminal and an output terminal, and the comparison The circuit 5 has a first input terminal, a second input terminal and an output terminal; the microprocessor 1 is respectively connected to the output terminal of the pump current detection circuit 2, the input terminal of the DDS AC signal generation circuit 3, and the output of the oxygen concentration difference electromotive force measurement circuit 4 terminal, the outpu...
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The invention discloses a controller of a wide-range oxygen sensor. The controller comprises a micro processor, a pump current detection circuit, a DDS (Digital Display Scope) alternating current signal generation circuit, an oxygen concentration difference electrodynamic potential measurement circuit, a comparison circuit, a heating driving circuit, a constant current source circuit, a first resistor, a second resistor, a first capacitor, a second capacitor and a third capacitor, wherein the micro processor is connected with the output end of the pump current detection circuit, the input end of the DDS alternating current signal generation circuit, the output end of the oxygen concentration difference electrodynamic potential measurement circuit, the output end of the comparison circuit and the input end of the heating driving circuit; the first input end of the pump current detection circuit is connected with one end of the second resistor. The controller of the wide-range oxygen sensor has the advantages that the controller is implemented through multiple separate circuit modules; on the basis of realizing control over the wide-range oxygen sensor, the controller is high in universality and wide in application range.
Description
technical field [0001] The invention relates to a controller, in particular to a controller of a wide-area oxygen sensor. Background technique [0002] In recent years, the word "smog" has gradually entered people's sight, and now it has attracted widespread attention, and has become an important factor affecting the health of residents. Among the factors that cause haze weather, the substandard emission of vehicle exhaust is an important reason for the generation of polluting gases. To this end, the governments of various countries have successively introduced more and more stringent automobile exhaust emission standards. Based on this standard, wide-area oxygen sensors with higher detection accuracy and wider detection range are widely used in automobiles instead of traditional switch-type oxygen sensors. [0003] The schematic diagram of the wide-area oxygen sensor widely used in the market is as follows: figure 1 As shown, the wide-area oxygen sensor has six connection...
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IPC IPC(8): G01N27/41G05B19/042
CPCG01N27/41G05B19/0428G05B2219/2656
Inventor 章晓娟谢建军邹杰简家文李辉周詹云
Owner NINGBO UNIV