Performance diagnostic device for machine

A performance measuring and diagnosing device installed on a vehicle for measuring and diagnosing performance of the vehicle, comprising:

• an acceleration sensor;
• an information acquisition section that acquires state information of the machine;
• an information preprocessing section that preprocesses the state information acquired by the information acquisition section;
• a frequency feature distinguishing section that executes frequency analysis on data after preprocessing by the information preprocessing section to distinguish between a state frequency feature candidate and a frequency feature indicating noise, the state frequency feature candidate being a candidate for a frequency feature indicating a state of the machine;
• a frequency feature estimating section that estimates the frequency feature corresponding to the state of the machine from among the state frequency feature candidates based on the state frequency feature candidate and the frequency feature indicating noise;
• and
• a performance measuring and diagnosing section that identifies a feature based on a number and a position relationship of the frequency features estimated by the frequency feature estimating section and diagnoses the state of the machine;
• and
• a display section that displays the diagnosed state of the machine on a screen,
• wherein the performance measuring and diagnosing section:
• diagnoses the state of the machine based on a frequency of the frequency feature when the number of the frequency feature estimated by the frequency feature estimating section is one;
• diagnoses the state of the machine based on a smallest frequency among the frequencies of a plurality of the frequency features when the number of the frequency features estimated by the frequency feature estimating section is plural and the frequency of the frequency feature having a largest amplitude among the plurality of frequency features is an integer multiple of the frequency of another frequency feature;
• and
• diagnoses the state of the machine based on a frequency of the frequency feature having the largest amplitude when the number of the frequency features estimated by the frequency feature estimating section is plural and the frequency of the frequency feature having the largest amplitude among the plurality of frequency features is not an integer multiple of the frequency of another frequency feature, and
• wherein the frequency feature distinguishing section executes:
• a state frequency feature candidate distinguishing processing of distinguishing a peak point having a largest amplitude among a plurality of peak points included within a predetermined range in a frequency band, as the state frequency feature candidate;
• a noise distinguishing processing of distinguishing peak points present within a predetermined range before and after the peak point distinguished as the state frequency feature candidate, as the frequency feature indicating noise;
• and
• an additional distinguishing processing of additionally executing the state frequency feature candidate distinguishing processing and the noise distinguishing processing on the undistinguished peak points within a predetermined range of the frequency band,
• wherein the information acquisition section acquires state information of a component that generates a vibration with a periodicity, as the state information of the machine, and
• wherein the information acquisition section acquires a detection value of the vibration of the vehicle detected by the acceleration sensor.