Hybrid vehicle and three-way catalyst diagnostic method and device thereof

Abstract

The invention belongs to the technical field of new energy vehicles, and particularly relates to a hybrid power vehicle and a three-way catalyst diagnostic method and device thereof. According to the method, after a whole vehicle is powered on, a cycle diagnosis process is started, the cycle diagnosis process comprises n single cycle diagnosis processes, and each single cycle diagnosis process comprises the steps that the whole vehicle is controlled to enter an engine active reverse towing control stage, and then the whole vehicle is controlled to enter the engine active reverse towing control stage; and in the whole cycle diagnosis process, the three-way catalyst is diagnosed according to the actual exhaust oxygen content condition of the engine. According to the method, the exhaust oxygen content of the engine of the hybrid vehicle has a process from thin to thick to thin, the three-way catalytic converter is diagnosed according to the actual exhaust oxygen content of the engine, and the conversion efficiency of the three-way catalytic converter, whether inlet/outlet oxygen is normal or not and whether the three-way catalytic converter breaks down or not can be effectively recognized; the diagnosis requirement of the three-way catalyst is met, and normal work of an engine diagnosis and emission diagnosis system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and in particular relates to a diagnostic method and device for a hybrid vehicle and a three-way catalytic converter thereof. Background technique [0002] With the deepening of the concept of environmental protection, the proportion of new energy technology in the automotive industry is increasing. As an important part of new energy vehicles, hybrid vehicles, especially gas-electric hybrid vehicles equipped with gas engines, are known for their energy saving and low emissions. The performance is favored by the market, and its share is gradually increasing. In order to ensure the emission control capability of gas-electric hybrid vehicles, the industry's attention to emission performance monitoring and diagnosis is also increasing. Three-way catalytic after-treatment technology, as the most important gas engine emission control technology, is widely used in heavy-duty gas vehicles at...

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Problems solved by technology

[0005] The invention provides a hybrid electric vehicle and its three-way catalytic converter diagnosis method and device, which are used to solve the problem that the hybrid electric vehicle cannot meet the diagnostic requirements of the three-way catalytic converter under the sliding condition with gear

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