Dew point control method and system for exhaust gas sensor and vehicle

By implementing heat compensation, shutdown heating, and dew point state reset strategies every time the internal combustion engine stops, the problem of condensation damage to hybrid vehicle exhaust sensors caused by frequent starts and stops is solved, dynamic protection and energy optimization of the sensors are achieved, and the reliability and efficiency of the system are improved.

CN120720105APending Publication Date: 2025-09-30DONGFENG MOTOR GRP
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Patent Information

Application Number
CN202511124263.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-12
Publication Date
2025-09-30

AI Technical Summary

Technical Problem

Existing technologies cannot effectively address the problem of secondary condensation damage to exhaust gas sensors under the frequent start-stop conditions of hybrid vehicle internal combustion engines. The lack of memory and compensation mechanisms makes the sensors easily damaged, and the existing control strategies lack active protection after shutdown.

Method used

Each time the internal combustion engine stops, heat compensation, shutdown heating and dew point status reset strategies are selectively executed according to the over-dew point status. Through intelligent decision-making by the control unit, dynamic protection across the start-stop cycle is achieved.

Benefits of technology

It significantly extends the service life of exhaust gas sensors, improves the reliability and stability of emission control systems, enhances the intelligence and energy efficiency of control strategies, and adapts to modern hybrid vehicle architectures.

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Abstract

The invention discloses a dew point control method and system for an exhaust gas sensor and a vehicle, and relates to the technical field of automobile emission control. The method provided by the invention comprises the following steps: when the internal combustion engine enters a shutdown stage from an operation stage, selectively executing a control action based on a dew point passing state of an exhaust gas sensor before shutdown: if the dew point passing state is not completed, determining a heat compensation value for subsequent heating; if the dew point passing is completed, shutdown heating is carried out on the sensor in the shutdown stage for heat preservation, physical parameters indicating the condensation risk are monitored, and when the parameters meet reset conditions, the dew point passing state is reset to be uncompleted. By introducing the dynamic control logic combining heat compensation, shutdown heat preservation and risk reset across the start-stop cycle, the waste gas sensor can be effectively prevented from being damaged due to condensation under various working conditions, the reliability of the emission system is remarkably improved, and the service life of the sensor is remarkably prolonged.
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