PATENT CLAIM ANALYSIS

Application Number: 16312443
Application Type: Utility
Filing Date: 2018-12
Publication Date: 2019-08
Patent Classification: ["701", "041000"]

Abstract:
An electric power steering apparatus of a vector control system that compensates a dead time of an inverter without tuning operation, improves a distortion of a current waveform and a responsibility of a current control, and suppresses a steering sound, a vibration and a ripple. The apparatus converts dq-axes current command values calculated based on at least a steering torque into 3-phase voltage command values, converts the 3-phase voltage command values into duty command values, driving-controls a 3-phase brushless motor by an inverter of a PWM control, and applies an assist torque to a steering system of a vehicle, wherein 3-phase detection voltages are estimated based on 3-phase motor terminal voltages, wherein loss voltages due to a dead time of the inverter are estimated from differences between 3-phase command voltages calculated from the duty command values and the 3-phase detection voltages, and wherein a dead time compensation of the inverter is performed by feeding-back dead time compensation values obtained by compensating the loss voltages to the 3-phase voltage command values.

Claim (Index 22):
An electric power steering apparatus of a vector control system that converts a d-axis current command value and a q-axis current command value calculated based on at least a steering torque into 3-phase voltage command values, driving-controls a 3-phase brushless motor by an inverter of a pulse width modulation (PWM) control using calculated 3-phase duty command values, and applies an assist torque to a steering system of a vehicle, comprising:\n a midpoint voltage estimating section to estimate midpoint voltages based on 3-phase motor terminal voltages, a motor rotational angle, a motor rotational number and an inverter-applying voltage; a 3-phase detection voltage calculating section to calculate 3-phase detection voltages from said midpoint voltages and said 3-phase motor terminal voltages; a 3-phase command voltage calculating section to calculate 3-phase command voltages based on said 3-phase duty command values and said inverter-applying voltage; a loss voltage calculating section to estimate 3-phase loss voltages due to a dead time of said inverter from differences between said 3-phase detection voltages and said 3-phase command voltages; an ideal dead time compensation model to obtain 3-phase ideal dead time compensation values based on said motor rotational angle, said motor rotational number and said inverter-applying voltage; a correcting section to correct voltage differences between said 3-phase loss voltages and said 3-phase ideal dead time compensation values based on said q-axis current command value; and an outputting section to output 3-phase dead time compensation values by processing compensation values from said correcting section based on said inverter-applying voltage, wherein a dead time compensation of said inverter is performed by feeding-back said 3-phase dead time compensation values to said 3-phase voltage command values.

Metadata:
- Claim Count in Document: 29.0
- Percentile: 98.0
- Lexical Diversity: 2.47945
- Patent Class: 701.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['16311469', '16312723', '16320664', '16312695', '16320734']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.5573705892365367
- 35 USC 102 Novelty (BERT): 0.6009203032369176
- Combined Prediction Score: 0.5617255606365748
- Mean Citation Score: 467.295928
- Max Citation Score: 529.97876
- Similarity Product: 521.3978076939725

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test