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High frequency injection-based oxygen sensor internal resistor detection circuit

A technology of oxygen sensor and high-frequency injection, which is applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, instruments, etc., can solve problems such as inability to measure in real time, and achieve real-time detection and optimize the effect of output voltage

Pending Publication Date: 2017-07-07
凯晟动力技术(嘉兴)有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it will change the output signal amplitude of the oxygen sensor, the original measurement method can only be measured in the laboratory or when the oxygen sensor is disconnected, and cannot be measured in real time.

Method used

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  • High frequency injection-based oxygen sensor internal resistor detection circuit
  • High frequency injection-based oxygen sensor internal resistor detection circuit

Examples

Experimental program
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Effect test

Embodiment

[0026] like Figure 1-2 As shown, a detection circuit for the internal resistance of an oxygen sensor based on high-frequency injection includes a high-frequency signal shaping circuit 10, a frequency-voltage conversion circuit 20, a feedback loop 30, an internal resistance Ri50 of the oxygen sensor, and a power supply for supplying power to the detection circuit Module VDD40, the high-frequency signal is input to the high-frequency signal shaping circuit 10, the output end of the high-frequency signal shaping circuit 10 is electrically connected to the input end of the frequency-voltage conversion circuit 20, and the frequency-voltage conversion circuit 20 is connected to the oxygen sensor The resistance Ri50 is electrically connected, and the output end of the frequency-to-voltage conversion circuit 20 is electrically connected to the input end of the feedback loop 30 .

[0027] In the above circuit:

[0028] High-frequency signal shaping circuit 10: used to receive high-fr...

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Abstract

The present invention provides a high frequency injection-based oxygen sensor internal resistor detection circuit. The high frequency injection-based oxygen sensor internal resistor detection circuit comprises a high-frequency signal shaping circuit, a frequency-to-voltage conversion circuit and a power supply module which is used for supplying power to the detection circuit; high-frequency signals are inputted into the high-frequency signal shaping circuit; the output end of the high-frequency signal shaping circuit is electrically connected with the input end of the frequency-to-voltage conversion circuit; the output end of the frequency-to-voltage conversion circuit outputs a voltage signal amplitude value corresponding to an oxygen sensor internal resistor Ri; and the frequency-to-voltage conversion circuit is electrically connected with the oxygen sensor internal resistor Ri. According to the high frequency injection-based oxygen sensor internal resistor detection circuit of the invention, the inner resistor of the oxygen sensor is detected real time, the internal resistor of the oxygen sensor can be judged accurately, and the output voltage of the oxygen sensor can be optimized, and an air-fuel ratio can be accurately calculated.

Description

technical field [0001] The invention relates to the technical field of automotive electronics, in particular to a detection circuit for the internal resistance of an oxygen sensor based on high-frequency injection. Background technique [0002] As the automobile exhaust emission regulations in various countries in the world become more and more stringent, the automobile oxygen sensor is a very important sensor in modern automobiles. It is used to monitor the oxygen content in the engine exhaust. The oxygen sensor outputs different voltages under different oxygen contents. The signal is fed back to the engine controller ECU, and the ECU controls the fuel injection volume and intake air volume according to the received voltage signal, and adjusts the air-fuel ratio to achieve the best air-fuel ratio of 14.7:1, so as to save fuel, improve fuel efficiency, and reduce pollution etc. purpose. [0003] Automotive oxygen sensors are usually installed in the exhaust system, directly...

Claims

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Application Information

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IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 陈江翠赫强
Owner 凯晟动力技术(嘉兴)有限公司
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