Calibration method of vehicle exhaust emission and vehicle-mounted self-diagnosis system

Abstract

The invention relates to a calibration method of vehicle exhaust emission and a vehicle-mounted self-diagnosis system. The calibration method is characterized in that the calibration method comprises the following steps of (1) testing an engine bench, (2) inspecting a vehicle, (3) optimizing and debugging the vehicle, (4) debugging the vehicle by operating mode method and (5) debugging the vehicle-mounted self-diagnosis system. The debugging of the vehicle-mounted self-diagnosis system comprises aging test of an oxygen sensor, fire detection test, critical catalyzer determination test, diagnostic test of parts, three-high test and verification test. The use of the calibration method can write the related calibration parameters obtained by various tests of the vehicle to be calibrated into a trip computer (ECU), leads emissions of the vehicle to be calibrated to achieve the national emission standards, leads the vehicle-mounted self-diagnosis system (OBD) to pass the national-level check-up and acceptance, further achieves the requirements on putting into market, leading the economy, the power performance and the driving performance of the vehicle to be calibrated to be best and meets the demands of consumers.

Description

technical field [0001] The invention relates to the field of vehicle detection, in particular to a calibration method for vehicle exhaust emission and vehicle self-diagnosis. Background technique [0002] With the development of my country's automobile industry, the number of domestic automobiles has increased significantly, and the related technical requirements for automobile exhaust emissions and the calibration of on-board self-diagnostic systems (0BD) are also getting higher and higher. [0003] At present, my country's automobile emission standards are equivalent to European emission standards, and the National IV emission standards implemented in 2007 are adopted. After the implementation of the National IV standards, OBD online fault diagnosis software must be installed. New automobile products must be calibrated by the National IV+OBD system before leaving the factory. Only products that pass the calibration can be put into the market. The core technology of the Nat...

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Problems solved by technology

New automobile products must be calibrated by the National IV+OBD system before leaving the factory. Only products that pass the calibration can be put into the market. The core technology of the National IV+OBD system calibration is mainly mastered by several multinational companies such as the United States, Japan, and Europe. In the hands of the company, the calibration of the national IV+OBD system for domestically produced cars is completed by these multinational companies. However, there are thousands of varieties of cars currently produced in my country, and several multinational companies can only complete dozens of models a year. For the calibration of automobiles, vehicles that have not completed the calibration of the National IV+OBD system and whose calibration results are unqualified cannot be put into the market. However, the calibration technology of the National IV+OBD system is still blank in China, which seriously hinders the domestic new models. The launch of automobiles and the development of the automobile industry

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