关键词: DMTL；电子诊断；泄露诊断

Abstract: An optimization study on electronic diagnosis is carried out to address the issue of the first activation failure of the fuel diagnosis module of tank leakage (DMTL) for vehicles with National VI emission standards during the vehicle's off-line electrical inspection. The research aims to address the diagnostic timeout anomalies caused by new software through software algorithm reconfiguration, while avoiding additional hardware modifications and production costs. By deeply analyzing the diagnostic logs, three innovative repair solutions are proposed: preloading for pre-order detection, dynamic switching of relays, and intelligent reset of the electronic control unit (ECU), and a multidimensional evaluation model is constructed. After verification by real vehicles, the ECU reset method achieves an 85% success rate for the first repair and a 100% success rate for the second repair while maintaining the integrity of the original diagnostic logic, and only increases the detection time by 30 s. This solution has been packaged into a standard software package and applied to the production line, reducing the per-vehicle repair time by 45%. The research results not only solve the mass production adaptation problem of the DMTL system, but also the software dynamic compensation strategy proposed by it provides a new method for the online diagnosis and optimization of automotive ECUs, which has significant engineering value for improving the reliability of the vehicle's emission system.

Key words: diagnosis module of tank leakage; electronic diagnostics; leakage diagnosis