Dynamic response diagnosis method and system for rear oxygen sensor of hybrid electric vehicle

Abstract

The invention discloses a dynamic response diagnosis method and system for a rear oxygen sensor of a hybrid electric vehicle. The method comprises the following steps: receiving a deceleration fuel cut-off permission request sent by a transmitter management system under an accelerator closing sliding working condition; after the vehicle is in the accelerator closing sliding working condition,controlling the target torque of a starting and power generation integrated motor ISG to be zero based on the deceleration fuel cut-off permission request; and performing dynamic response diagnosis on the rear oxygen sensor. According to the method, the deceleration fuel cut-off permission request sent by the transmitter management system under the accelerator closing sliding working condition is received, and after the deceleration fuel cut-off permission request is received and the vehicle is in the accelerator closing sliding working condition, the target torque of the starting and power generation integrated motor is controlled to be zero, so that the engine enters the DFCO working condition similar to that of a traditional vehicle; an oxygen signal can be changed from thick to thin, so that a deceleration fuel cut-off working condition is created for response diagnosis of the rear oxygen sensor.

Description

technical field [0001] The invention relates to the technical field of hybrid electric vehicles, in particular to a dynamic response diagnosis method and system for a rear oxygen sensor of a hybrid electric vehicle. Background technique [0002] With the increasingly stringent fuel consumption regulations in the automotive industry, traditional fuel vehicles cannot meet such strict requirements under the existing technical conditions, so new energy vehicles with low fuel consumption are growing rapidly. Pure electric vehicles are limited by the cruising range and battery technology bottlenecks and cannot be widely popularized at present. Hybrid vehicles combine the advantages of pure gasoline vehicles and electric vehicles, and gradually become the mainstream solution for current OEMs to deal with fuel consumption regulations. [0003] Oxygen sensor response diagnosis is a diagnostic item required by OBD (On-Board Diagnostic, on-board diagnostic system) regulations, and is a...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention solves the technical problem in the prior art that a hybrid electric vehicle cannot create deceleration and fuel cut-off conditions for the response diagnosis of the rear oxygen sensor by providing a dynamic response diagnosis method and system for a rear oxygen sensor of a hybrid electric vehicle. Response diagnostics of the rear oxygen sensor create a deceleration cut-off condition

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