本规范的目的是提出一套功能要求，定义用户和硬件接口，同时提供足够的能力满足合规性演示和工程开发的缺火模式。在本要求中，任何对“点火或喷油器控制信号”的引用都可以互换使用，以推断受影响的火花点火式发动机点火控制信号或压燃式发动机喷油器控制信号被中断、定时或直接通过缺火发生器。 对于火花点火发动机，缺火发生器的作用类似于火花熄灭装置，通过抑制正常点火线圈放电来诱导缺火。它通过监测车辆的点火正时信号来实现，并暂停选定气缸点火事件的点火线圈饱和。在火花点燃式汽油内燃机中，失火发生器将因此导致发动机失火；包括旋转引擎。 对于压燃式发动机，缺火发生器起到了燃油喷射失败装置的作用，通过抑制正常燃油喷射脉冲来诱导缺火。 它通过监测喷油脉冲信号并暂停选定气缸点火事件的喷油脉冲来实现。因此，失火发生器将导致压燃式发动机失火。 本要求假设用户对失火诊断和点火控制有基本了解。本要求不旨在作为失火指南的介绍或对监管要求的解释。

The intent of the specification is to present a functional set of requirements which define the user and hardware interfaces while providing sufficient capability to meet the misfire patterns for compliance demonstration and engineering development. Throughout this requirement, any reference to "ignition or injector control signal" is used interchangeably to infer that the effected spark ignition engine's ignition control signal or the compression ignition engine's injector control signal is interrupted, timing phased, or directly passed by the misfire generator. For spark ignition engines, the misfire generator behaves as a spark-defeat device which induces misfires by inhibiting normal ignition coil discharge. It does so by monitoring the vehicle's ignition timing signals and suspends ignition coil saturation for selected cylinder firing events. The misfire generator will thereby induce engine misfire in spark ignited gasoline internal combustion engines; including rotary engines. For compression ignition engines, the misfire generator behaves as a fuel injection-defeat device which induces misfire by inhibiting the normal fuel injection pulses. It does so by monitoring the injection pulses signal and suspending the injection pulses for selected cylinder firing events. The misfire generator will thereby induce engine misfire in compression ignition engines. This requirement assumes that the user has a fundamental understanding of misfire diagnostics as well as ignition controls. This requirement is not intended to be an introductory misfire guideline or interpretation of regulatory requirements.