An Approach to Wheel Loader Bucket Raise Time Detection

Abstract

An approach to wheel loader bucket raise time recognition based on mathematical algorithms is presented in this communication. Wheel loader bucket raise time is one of the most essential parameters in total cycling time, which provides the work efficiency for wheel loader. Wheel loader bucket raise time is detected by the application of a simple mathematical algorithm after wavelet transform. Firstly, a signal of wheel loader total cycling time signal (original signal) which includes bucket raise time, bucket dump time and bucket lower time was selected, and then it was processed by the wavelet transform. Secondly, we could get wavelet decomposition approximation signal a5, and mathematical algorithm was implemented at simple computational cost by signal form, which detected the singular points from signal a5. Finally, original signal based on threshold decision combined singular points to detect the onset point and offset point of bucket raise segment in original signal. And then we could get bucket raise time. The records were from a loader factory online detection test. The result demonstrated that the detection rate is more than 95%. This study implemented automatic detection of wheel loader bucket raise time.