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Vehicle wide area oxygen sensor lose-efficacy monitoring method

A technology of oxygen sensor and failure monitoring, which is applied in the direction of machines/engines, exhaust gas treatment, electrical control, etc., and can solve problems such as rising emissions

Active Publication Date: 2019-02-22
DONGFENG MOTOR CORP HUBEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing monitoring of the wide-area oxygen sensor is to set the target air-fuel ratio and force oscillation, which belongs to active monitoring and will cause increased emissions

Method used

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  • Vehicle wide area oxygen sensor lose-efficacy monitoring method
  • Vehicle wide area oxygen sensor lose-efficacy monitoring method
  • Vehicle wide area oxygen sensor lose-efficacy monitoring method

Examples

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Embodiment Construction

[0062] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0063] The wide-area oxygen sensor failure monitoring method for vehicles involved in the present invention includes the monitoring of the rich-to-lean response hysteresis in the exhaust system. When the fuel is cut off, monitor the reaction time of the fuel in the exhaust gas reflected by the oxygen sensor from rich to lean;

[0064] Monitoring of response hysteresis from rich to lean fuel in exhaust gases, such as figure 1 shown, including the following steps:

[0065] Step 1: In the failure initialization stage, the monitoring signal of the wide-area oxygen sensor is initialized;

[0066] Step 2: In the waiting stage, wait for the engine fuel cut request until the target fuel equivalence ratio FEQR in the exhaust pipe ≤ 0.01, and the actual fuel equivalence ratio FEQR in the exhaust pipe reflected by the wide-area oxygen sensor > 0.9, then ...

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Abstract

The invention discloses a vehicle wide area oxygen sensor lose-efficacy monitoring method. According to the vehicle wide area oxygen sensor lose-efficacy monitoring method, wide area oxygen sensor lose-efficacy monitoring comprises response delay monitoring from thick to thin and response delay monitoring from thin to thick in an air exhaust system, and the monitoring processes both comprise a lose-efficacy initialization stage, a waiting stage, an offset time calculation stage, a response delay time calculation stage, a final response time calculation stage and a lose-efficacy monitoring evaluating stage. By means of the vehicle wide area oxygen sensor lose-efficacy monitoring method, the vehicle wide area oxygen sensor lose-efficacy monitoring can be rapidly and accurately realized.

Description

technical field [0001] The invention relates to the technical field of engine control, in particular to a method for monitoring failure of a wide-area oxygen sensor for vehicles. Background technique [0002] "Light Vehicle Pollutant Emission Limits and Measurement Methods (China Phase Six)" clearly puts forward the diagnostic requirements for the front oxygen sensor: OBD (On-Board Diagnostic, on-board diagnostic system) system should deal with the front oxygen sensor Controlled sensors, traditional switch-type oxygen sensors and / or wide-area or general-purpose sensors) are monitored for failures, including output voltage, response rate, and parameters that may affect emissions. [0003] The diagnosis strategy for the switch-type oxygen sensor in the prior art is not suitable for the wide-area oxygen sensor (the switch-type oxygen sensor can only qualitatively read the air content in the exhaust, and the wide-area oxygen sensor can accurately read the air content in the exha...

Claims

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Application Information

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IPC IPC(8): F01N11/00F02D41/22
CPCF01N11/007F02D41/22Y02T10/40
Inventor 秦龙王俊鹏王恺赵芳勋
Owner DONGFENG MOTOR CORP HUBEI
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