Three-way catalytic converter health state judgment system and method based on front and rear oxygen sensors

Abstract

The invention discloses a three-way catalyst health state judgment system and method based on a front oxygen sensor and a rear oxygen sensor. The system comprises a main control module, the main control module is used for receiving input of voltage of the oxygen sensors, the main control module comprises a storage instruction, when the instruction is operated, the following operation processes that voltage values of the oxygen sensors of a vehicle are acquired, whether oxygen sensor heaters, the oxygen sensor activity and a three-way catalyst are abnormal or not are judged according to the collected voltage values of the oxygen sensors are achieved. According to the judgement system and method, the voltage of the front oxygen sensor and the rear oxygen sensor and the working states of theremote oxygen sensor heaters, the oxygen sensors and the three-way catalyst are collected after the vehicle is ignited for a certain time, therefore, the health states of the oxygen sensors can be judged in time, and the situations that air is polluted due to the facts that the automobile fuel consumption is high and the tail gas exceeds the standard due to abnormal work of the vehicle and abnormal work of the components can be greatly reduced.

Description

technical field [0001] The invention relates to the field of vehicle environmental protection, in particular to a device and method for judging the health state of a three-way catalytic converter for vehicle tail gas conversion based on front and rear oxygen sensors. Background technique [0002] With the continuous growth of the number of vehicles, the tail gas emitted by cars has become an important reason affecting the urban air quality, and the impact of tail gas emissions on urban environmental problems has become increasingly prominent. More than 90% of the harmful substances emitted by automobile exhaust can be purified by the three-way catalytic converter, but according to further investigations, it is found that 60% of the hydrocarbons (HC) in the emitted automobile exhaust are due to the failure of the automobile emission control system or the three-way The performance of the catalytic converter is reduced, resulting in incomplete purification and discharge. Howev...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the existing vehicle three-way catalytic converter health status cannot be judged in real time, thereby providing a device and method for the vehicle to judge the health status of the vehicle three-way catalytic converter in real time

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