本文以发动机测试中一项重要的特性测试项目——速度特性测试为目的，重点研究了交流电力测功机及其控制系统设计。

Aiming at the speed characteristics test, which is one of important test items of engine test, this paper proposes studies of ac electrical dynamometer and its control system.

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本文给出了交流电力测功器的系统结构图、系统工作原理、控制电路组成及功率测量方法。

In this paper the dynamometer's structure block diagram, system principle, power measurement and the control strategy have been given.

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目前，交流电力测功机是进行发动机性能试验的重要装置，其优点在于试验条件容易控制，参数便于采集处理，测量精度较高。

AC electrical dynamometer is an important device for engine test with easy-controlled testing conditions, easy-collected and managed parameters as well as high measuring precision.

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