Abstract : This paper briefly describes the advantages of using fuzzy control algorithm and inverter communication to control a motor. It focuses on analyzing the design process of a two-dimensional fuzzy controller based on a combination of formula and table lookup methods, and the communication protocol between the microcontroller (SCM) and the inverter. Based on this, a flowchart of closed-loop speed adjustment is presented. Keywords : fuel injection pump testing platform, fuzzy control algorithm, inverter communication , closed- loop speed adjustment The diesel engine injection pump test bench is a device used to test the performance of injection pumps. It mainly consists of several parts, including an electric motor drive unit, a frequency converter, the pump system under test, measuring devices, and a computer control system. Its control structure is shown in Figure 1. The control part of this system is implemented using an 89C52 microcontroller. As shown in Figure 1, the electric motor is the power source for the pump under test, and the Hall sensor and keyboard settings form a closed-loop speed regulation. Since the measurement of other parameters is performed under the condition that the injection pump is running at a stable speed according to the set speed, the stability of its speed is a prerequisite for the accuracy of other parameter measurements. To ensure speed accuracy, we use a fuzzy control algorithm for closed-loop speed regulation. Because the fuzzy algorithm does not require establishing a precise mathematical model of the controlled object, but only requires summarizing the data from the on-site operators into a relatively complete language control, it can bypass the influence of uncertainties, inaccuracies, and nonlinearities of the controlled object, and is especially suitable for nonlinear, time-varying systems such as electric motors. The adjustment value obtained by the fuzzy control algorithm is sent to the frequency converter, thereby controlling the running speed of the motor. Currently, frequency converters control motors primarily by changing the amplitude of analog signals to regulate motor speed, using relays to switch between forward, reverse, and stop modes. This control method suffers from excessive relays, reducing system stability. Furthermore, the control signal must be transmitted to the frequency converter via a linear isolation amplifier and undergo A/D conversion before speed adjustment. Modern frequency converters offer multiple compatible communication interfaces, allowing for changes to the motor's operating state directly through communication. They transmit digital signals, requiring only optocouplers for isolation and eliminating the A/D conversion process. For these reasons, this system uses an LG frequency converter to transmit control commands via communication. [b][align=center]For more details, please click: Design of a Frequency Converter Communication Speed ​​Control System Based on Fuzzy Control Algorithm[/align][/b]