System and method for measuring equivalent moment of inertia of diesel engine

Abstract

The invention discloses a system and a method for measuring equivalent moment of inertia of a diesel oil engine. The system comprises a transmission device, a miniature speed regulation motor, a motorcontrol module, a rotating speed measuring module, a shaft work measuring module, and a data processing module. Two ends of the transmission device are respectively connected to an output shaft of the diesel oil engine and a rotating shaft of the miniature speed regulation motor. The motor control module drives the motor to be stably launched, regulate speed and conduct braking based on the transmission ratio of the transmission device and the rotating speed sent by the rotating speed measuring module. The shaft work measuring module measures the kinetic energy of the diesel engine, acceptedby the motion assembly during the process of being accelerated and driven by the motor. The data processing module calculates the equivalent moment of inertia of the diesel oil engine based on the starting rotating speed value and the ending rotating speed value and the shaft work value of the accelerating process. The invention is advantageous in that the speed regulation motor is adopted to driven the diesel oil engine, and through measuring the kinetic energy accepted by the motion assembly of the diesel engine within the acceleration time section, the equivalent moment of inertia of the diesel oil engine can be accurately measured; measuring precision is high, device is convenient to carry along and easy to operate.

Description

technical field [0001] The invention relates to a system and method for measuring the equivalent moment of inertia of a diesel engine, in particular to a system and method for accurately measuring the equivalent moment of inertia of a diesel engine on an industrial site, and belongs to the technical field of mechatronics. Background technique [0002] Among the diesel engine power test methods, there is a method to characterize the output power by measuring the acceleration power of the no-load diesel engine, that is, the no-load dynamometer method. Because the equipment is small and easy to carry, it can be used for on-site diesel engine power testing. In the measurement process of this method, the equivalent moment of inertia of the diesel engine needs to be accurately determined, so as to calculate its maximum output power. However, in the actual application process, it is found that the random error of the equivalent moment of inertia measured by this method is relativel...

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Problems solved by technology

The added mass method in the article "Using the Added Mass Method to Determine the Total Moment of Inertia of Engine Moving Parts" by Liu Yi of Jilin University of Technology is based on the premise that "the average mechanical loss torque is the same with or without the added moment of inertia". The correctness of this assumption and The stability is actually difficult to guarantee, and the measurement accuracy and repeatability are not high; Wu Bo of Shandong University of Technology "Research on the Calculation Method of the Moment of Inertia Test of Internal Combustion Engines" and Hu Yuping of Tianjin University "A Test Method for Determining the Total Moment of Inertia of Internal Combustion Engines" The instantaneous speed method in this article replaces the instantaneous mechanical loss torque with the average mechanical loss torque. The test accuracy is greatly affected by the speed level, and the operation is cumbersome and the realizability is poor; ", application number 201010529442.7, only applicable to diesel generator sets, not applicable to single diesel engine

Therefore, none of the existing measurement methods can meet the requirements of measuring the equivalent moment of inertia of diesel engines on the industrial site

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