DPF system OBD fault diagnosis method based on engine oil quality sensor

Abstract

The invention discloses a DPF system OBD fault diagnosis method based on an engine oil quality sensor. The OBD fault diagnosis method comprises the engine oil quality sensor, a soot signal processingunit, an ECU (electronic control unit), a DPF differential pressure sensor and an instrument panel, wherein the engine oil quality sensor is connected with the soot signal processing unit through electric signal transmission, the soot signal processing unit sends the soot content to the ECU, and the DPF pressure sensor is electrically connected with the instrument panel through the ECU. Accordingto the DPF system OBD fault diagnosis method based on the engine oil quality sensor, a modeled DPF filtering precision algorithm is used for detecting the content of the soot in engine oil, interference signals are few, and the precision degree is high; and in addition, the system is simple in structure, and the false alarm probability is reduced. Meanwhile, the engine oil quality sensor is low incost, and the existing DPF system OBD fault diagnosis cost can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field related to automobiles, is applicable to diesel engines and post-processing systems, and specifically relates to an OBD fault diagnosis method of a DPF system based on an engine oil quality sensor. Background technique [0002] According to the overall requirements of the national green development, the national six-stage emission regulations will be implemented soon, and DPF technology is the key technical solution to meet the emission regulations, and when the DPF fails, it will directly affect the emission performance of the vehicle, so the OBD system for DPF fault diagnosis It plays a vital role in whether the vehicle emissions can continue to meet the standards. [0003] Patent Document 1 (CN 104747258) discloses a DPF system OBD fault diagnosis method. The method analyzes the data obtained by the sensor module, the actuator module and the CAN communication module through the micro-control unit, and com...

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Problems solved by technology

The main disadvantages of this scheme: ①Most of the whole vehicle is in transient working conditions, and it is difficult to capture the same working conditions. Due to the short stabilization time, the accuracy cannot be guaranteed; Can not guarantee

[0004] Patent Document 2 (KR1020160167356) discloses an OBD fault diagnosis method using a nitrogen oxide sensor. The main disadvantage of this method is that the cost of the nitrogen oxide sensor is high, and at the same time, the reliability of the sensor is at risk due to the high exhaust temperature.

[0005] In order to solve the problems of high cost and low precision in the current detection method, starting from the principle, the soot in the original exhaust of the engine is estimated by the soot content in the engine oil, so as to correlate with the DPF regeneration and accurately determine the fault of the DPF system

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