Vehicle-mounted monitoring system and method for three-way catalytic converter for vehicle

Abstract

The invention discloses a vehicle-mounted monitoring system and method for a three-way catalytic converter for a vehicle. The system comprises a signal acquiring and processing circuit, an analog / digital (A / D) conversion circuit connected with the input end of the signal acquiring and processing circuit, as well as a fault indication lamp circuit and a fault alarm circuit which are connected with the output end of the signal acquiring and processing circuit, wherein the input end of the A / D conversion circuit is connected with a front oxygen sensor and a rear oxygen sensor. The method comprises the following steps of: 1, acquiring and processing voltage signals output by the front oxygen sensor and the rear oxygen sensor in real time; 2, judging whether the front oxygen sensor and the rear oxygen sensor start working effectively; 3, judging whether the three-way catalytic converter works normally; and 4, sending out a fault alarm signal. The system has the advantages of simple structure, rational design, convenience for use and operation, economy and practicability, high data processing speed, high data processing capability, high precision, high practical value, good use effect, no influence on emission and convenience in popularization and use.

Description

technical field [0001] The invention belongs to the technical field of automotive electronics, and in particular relates to a vehicle-mounted monitoring system and a monitoring method of a three-way catalytic converter for vehicles. Background technique [0002] The development and application of three-way catalytic converters have played an important role in reducing vehicle emissions. However, due to the technical conditions of the engine, the quality of fuel and lubricating oil, incomplete combustion of fuel, high operating temperature of the catalyst, chemical poisoning and other factors, the three-way catalytic converter is prone to deactivation, poisoning and other phenomena, resulting in The conversion efficiency of the three-way catalytic converter decreases until it fails. In order to provide timely feedback to the driver about the technical status of the emission control system, on-board diagnostic systems are currently installed in many vehicles. [0003] The mo...

AI Technical Summary

Problems solved by technology

Although this method can measure the oxygen storage capacity of the three-way catalytic converter and judge whether the three-way catalytic converter is invalid, its cut-in will affect the normal air-fuel ratio control and affect emissions

Moreover, the on-board monitoring system of the three-way catalytic converter for vehicles in the prior art also has the defects and deficiencies of complex structure and high implementation cost.

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