首页>
外国专利>
Method of monitoring in-use performance ratios of onboard diagnostic systems for plug-in hybrid electric vehicles
Method of monitoring in-use performance ratios of onboard diagnostic systems for plug-in hybrid electric vehicles
展开▼
机译:监视插电式混合动力汽车的车载诊断系统的使用性能比的方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
A method of monitoring an onboard diagnostic system for a plug-in hybrid electric vehicle includes incrementing the denominator of an N/D ratio for the onboard diagnostic system only when a total time criteria, a vehicle speed criteria and an idle criteria are satisfied after an internal combustion engine of the vehicle has been fueled. The diagnostic system performance is summarized into a single N/D ratio. When an underperforming ratio is identified, the system controls the engine to provide more engine operation and subsequent diagnostic observability. The denominator of the N/D ratio is compared to a verification denominator to identify vehicles that are typically operated in a manner such that an engine-on cycle does not begin, or is not identified, until very near the end of the drive cycle, thereby preventing the denominator and a numerator of the N/D ratio from incrementing, and thereby providing a false passing performance ratio.
展开▼