Oxygen sensor diagnosing method and system and vehicle with system

Abstract

The invention provides an oxygen sensor diagnosing method and system and a vehicle with the system. The method comprises the following steps that the vehicle is controlled to be operated in the operation condition suitable for diagnosing an oxygen sensor, and the actual loads of an engine are detected in real time to obtain the actual load changing ranges of the engine; the actual load upper limit in the actual load changing ranges of the engine is compared with a preset load upper limit in a vehicle-mounted diagnosing system; if the actual load upper limit in the actual load changing ranges of the engine is larger than the preset load upper limit in the vehicle-mounted diagnosing system, the preset load upper limit in the vehicle-mounted diagnosing system is adjusted according to the actual load upper limit in the actual load changing ranges of the engine; the oxygen sensor is diagnosed according to the adjusted preset load upper limit in the vehicle-mounted diagnosing system. According to the method, diagnosis on the oxygen sensor in a specific road condition can be quickly completed, and controlling over the vehicle emission level in the specific road condition is facilitated.

Description

technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a diagnosis method and system of an oxygen sensor and a vehicle with the system. Background technique [0002] OBD (On-BoardDiagnostic, on-board diagnostic system) is one of the most effective means of vehicle emission management. The system monitors the working status of various parts of the vehicle to determine whether the vehicle is faulty. When a fault occurs, the ECU (Electronic Control Unit, Electronic Control Unit) records the fault information and related codes, and issues a warning through the fault lamp to inform the driver. Among them, the ECU guarantees access to and processing of fault information through standard data interfaces. [0003] Oxygen sensor diagnosis is one of the necessary inspection items of OBD. In order to truly reflect the working status of the oxygen sensor, the OBD control strategy is set in a relatively stable working condition ...

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Problems solved by technology

[0005] However, when the vehicle is driving in a multi-slope area (such as the urban area of ​​Chongqing, etc.), it will sound that Z_latp cannot be set for a long time. This is because the actual load of the vehicle cannot be stabilized at The conventional 5th gear is within the load range of 70±2km / h (the original setting value in the OBD control strategy: load upper limit RLTPVKO=50.3%, load lower limit RLTPVKU=27.0%), and once it exceeds this range, B_dlatp will not be set, so that The counter zwpvk is always in the initialization state, that is, B_lrtpp and B_dlaff cannot be set at the same time, so it is difficult for the counter zlsatp to accumulate to 12, so that B_anztp is not set → B_nolatp is not set → Z_latp is not set, resulting in the vehicle not meeting the diagnostic conditions of the oxygen sensor , so that the oxygen sensor diagnosis cannot be completed

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