空气燃料交叉限制是燃烧控制系统的关键。本文详细讨论了空气燃料交叉限制的功能、原理和实现方法，提出了几种实用的设计方案，可供设计和调试人员借鉴。 Air fuel crossover is the key to combustion control systems. This paper discusses in detail the function, principle and implementation of the air fuel cross-limit, and presents several practical design options that can be borrowed by design and commissioning personnel.