Wide-band oxygen sensor temperature control method

Abstract

The invention relates to the technical field of automobile electronic sensing detection, and particularly relates to a wide-band oxygen sensor temperature control method which concretely comprises the steps that a temperature signal in a wide-band oxygen sensor is acquired firstly, the temperature signal is converted through an A / D converter and then compared with a target temperature value, deviation e and deviation change rate e<delta> are calculated, deviation and deviation change rate can act as input of a fuzzy PID controller, and the three parameters K, K and K<D> of the PID controller are regulated online through fuzzy reasoning; and then PID control operation is performed and duty ratio of a corresponding temperature control PWM signal is outputted to regulate power of a heater so as to realize temperature control. According to realization of wide-band oxygen sensor temperature control based on a fuzzy PID control algorithm, establishment of an accurate model of a wide-band oxygen sensor temperature control object can be avoided. Meanwhile, temperature control accuracy can be enhanced through combination of fuzzy control and PID control, and the dynamic and static performance of wide-band oxygen sensor temperature control can be enhanced.

Description

technical field [0001] The invention relates to the technical field of automotive electronic sensing and detection, in particular to a temperature control method for a wide-area oxygen sensor. Background technique [0002] With the rapid development of the economy, the number of cars in the world has increased rapidly. This trend has improved the living standards of residents, but it has also exacerbated environmental pollution and energy shortages. The tail gas emitted by automobiles mainly contains harmful gases and substances such as CO, NOx, SOx and PM2.5, which are the main causes of greenhouse effect and smog. wide-area oxygen sensor The (air-fuel ratio) sensor is the most widely used vehicle exhaust oxygen content detection device. It detects the oxygen concentration in the vehicle exhaust and feeds back the detection results to the engine electronic control unit (ECU) to improve the combustion performance of the engine. At the same time, it improves the catalytic ...

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Problems solved by technology

[0007] (4) Environment complexity

[0010] (1) The temperature control design is not highly targeted, and there is no temperature control algorithm designed for the temperature characteristics of the wide-area oxygen sensor;

[0011] (2) The temperature control algorithm is too simple, and the PID control does not establish an accurate object model, which cannot meet the accuracy requirements of temperature control;

[0012] (3) The anti-interference ability of temperature control is not strong, and the dynamic and static performance needs to be improved

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