PATENT CLAIM ANALYSIS

Application Number: 15754676
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-08
Patent Classification: ["060", "468000"]

Abstract:
A hydraulic working machine is provided that uses a variable displacement pump and open center type flow rate control valve for a controlling a hydraulic actuator, and has a negative control throttle disposed in a center bypass oil passage to generate a negative control pressure. A hydraulic pump control system performs virtual bleed-off control for reducing the bleed-off flow rate of the center bypass oil passage, and can operate the hydraulic actuator with the same performance as an open center control. The control system includes a bypass cut valve disposed upstream from the negative control throttle to reduce flow through the center bypass oil passages, and a negative control pressure output valve that outputs a virtual negative control pressure. The control system is configured to reduce the bleed-off flow rate by operating the bypass cut valve when virtual bleed-off control is performed, and to reduce the pump flow rate by the bleed-off reduction flow rate.

Claim (Index 2):
The hydraulic pump control system of the hydraulic working machine according to  claim 1 , wherein the control means:\n performs virtual bleed-off control in which the bypass cut valve is operated based on the manipulation of the hydraulic actuator manipulation tool to reduce the bleed-off flow rate flowing to the oil tank from the center bypass oil passage, determines a bleed-off reduction flow rate based upon a difference between a virtual bleed-off flow rate obtained on the assumption that the bypass cut valve is not present and an actual bleed-off flow rate at the time of operation of the bypass cut valve, obtains a pump request flow rate by subtracting the bleed-off reduction flow rate from a virtual pump flow rate obtained on the assumption that the bypass cut valve is present, and operates the negative control pressure output valve to output the virtual negative control pressure based upon the pump request flow rate.

Metadata:
- Claim Count in Document: 13.0
- Percentile: 88.0
- Lexical Diversity: 2.4697
- Patent Class: 60.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15413819', '15726840', '14217678', '14217721', '15556016']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.743524332103429
- 35 USC 102 Novelty (BERT): 0.5112558415558881
- Combined Prediction Score: 0.7202974830486749
- Mean Citation Score: 307.380236
- Max Citation Score: 324.7327
- Similarity Product: 280.0996679742813

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