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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Problems solved by technology

Because it will change the output signal amplitude of the oxygen sensor, the original measurement method can on

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

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Example Embodiment

[0025] Example

[0026] Such as 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 of the oxygen sensor Ri50, and a power supply for 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 resistor Ri50 is electrically connected, and the output end of the frequency-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: for receiving high-frequency signa...

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Abstract

The present invention proposes a detection circuit for the internal resistance of an oxygen sensor based on high-frequency injection, including a high-frequency signal shaping circuit, a frequency-voltage conversion circuit, and a power supply module that supplies power to the detection circuit, wherein the high-frequency signal input is high A high-frequency signal shaping circuit, the output end of the high-frequency signal shaping circuit is electrically connected to the input end of the frequency-voltage conversion circuit, and the output end of the frequency-voltage conversion circuit outputs a voltage signal amplitude corresponding to the internal resistance Ri of the oxygen sensor; The frequency-to-voltage conversion circuit is electrically connected to the internal resistance Ri of the oxygen sensor. The detection circuit of the internal resistance of the oxygen sensor based on high-frequency injection provided by the present invention can accurately determine the internal resistance of the oxygen sensor by detecting the internal resistance of the oxygen sensor in real time, optimize the output voltage of the oxygen sensor, and then accurately calculate the air-fuel ratio .

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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