中文摘要：

提出三种过程质量指数（PQI）的过程质量指数系统，基于过程质量指数的统计公差提供了一个过程质量要求和控制图设计之间的标准化界面．通过基于过程质量指数的统计公差带增加对x^--R或x^--s控制图中线的约束，建立一种保证预设质量和过程稳态的统计过程控制新方法．这不仅增强了控制图的功能，也为过程质量规划、统计公差和保证预设质量的SPC相关参数的并行设计提供了指导．

英文摘要：

The process quality index （PQI） system was presented based on three PQIs by which the PQI-oriented statistical tolerancing provides a standardized interface between process quality requirements and control chart design. By adding a restriction to the center lines of x^-and R chart or x^-and s chart based on the PQI-oriented statistical tolerance zone, a new SPC approach for assuring both predetermined quality and process stability is presented, which enhances the function of control charts and provides a possibility and guideline to concurrent design for the process quality plan, statistical tolerance and related parameters of SPC to assure designated process quality.