System and method for diagnosing low-desorption pipeline of engine

Abstract

The invention provides a system and method for diagnosing a low-desorption pipeline of an engine. A carbon tank is connected with an intake manifold through the low-desorption pipeline. The system comprises a diagnosis controller, an electromagnetic valve and a pressure sensor; the control end of the electromagnetic valve is connected with the first output end of the diagnosis controller, the electromagnetic valve is arranged on the low-desorption pipeline, and is used for controlling conduction or breaking between the carbon tank and the intake manifold; the output end of the pressure sensoris connected with the first input end of the diagnosis controller, and the pressure sensor is arranged on the intake manifold, and is used for detecting the gas pressure in the intake manifold; and when the electromagnetic valve is conducted, if the change value of the gas pressure is larger than the first pressure threshold value, the diagnosis controller judges that the low-desorption pipeline is in a normal state, otherwise, the low-desorption pipeline is judged to be in a leakage state. According to the system and method, the safety and environmental protection performance of an automobilecan be improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a diagnostic system and method for an engine low desorption pipeline. Background technique [0002] The low-desorption pipeline system is a commonly used system on naturally aspirated engines. It can transfer the oil-gas mixture and exhaust gas absorbed by the carbon canister to the intake manifold, and participate in the combustion in the cylinder again to prevent dilution of engine oil and oil leakage, etc. Hazard happens. [0003] However, there are still many cars in the market that have been exposed to engine oil leakage. In order to better deal with this problem, the National VI emission regulations have added OBD diagnosis of low desorption pipeline system leakage, and made clear regulations : When the carbon canister, carbon canister control valve and pipeline of the system are disconnected, or the carbon canister, carbon canister control valve and pipeline leak, the...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a diagnostic system and method for low desorption pipelines of engines, which solves the problem of lack of pipeline leakage and fault diagnosis when low desorption pipelines are used in existing automobile engines, which easily causes oil leakage, and can improve the safety of automobiles sex and environmental performance

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