Method and device for determining flow fault of EGR (Exhaust Gas Recirculation) valve, electronic equipment and medium
By actively adjusting the opening degree of the EGR valve and performing high reliability diagnosis under similar operating conditions, the flow failure misdiagnosis problem when the EGR rate is low is solved, and the accuracy and reliability of the system are improved.
CN120231668APending Publication Date: 2025-07-01ROBERT BOSCH GMBH
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Patent Information
- Application Number
- CN202311839300.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2025-07-01
AI Technical Summary
Technical Problem
In the prior art, when the EGR rate is low, the accuracy of EGR valve flow fault diagnosis is poor, which can easily lead to misdiagnosis and affect the reliability of the vehicle emission system.
Method used
By actively adjusting the opening degree of the EGR valve to a state suitable for flow detection, when the vehicle enters a similar working condition again, a higher reliability flow fault diagnosis is performed, and the detection indicators are used to confirm whether there is a fault in the EGR valve.
Benefits of technology
It improves diagnostic accuracy in the case of low EGR rates, avoids false positive problems, enhances system reliability, and reduces the impact on normal system emissions.
✦ Generated by Eureka AI based on patent content.
Abstract
The disclosure relates to a method, an apparatus, an electronic device and a medium for determining a flow failure of an exhaust gas recirculation (EGR) valve. The method includes determining that there is a flow anomaly at a first opening of the EGR valve. And in response to the fact that the working condition of the vehicle enters the preset working condition range, the EGR valve is controlled to be opened from the first opening degree to the second opening degree. The method further includes determining a first detection indicator associated with the flow rate for the EGR valve at the second opening. The method further includes determining that the EGR valve has a flow fault in response to the first detection indicator satisfying a predetermined condition. In this way, the diagnosis accuracy can be improved under the condition that the EGR rate is low, the false alarm problem is avoided, and the reliability of the system is improved. And the opening degree of the EGR valve is increased after the flow abnormality is preliminarily diagnosed, namely, the EGR rate is improved, and the influence on emission of a normal system is avoided.
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