Materials handling vehicle estimating a speed of a movable assembly from a lift motor speed
US8935058B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2012 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Jun 12, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66F17/003
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A materials handling vehicle is provided comprising: a support structure including a fixed member; a movable assembly coupled to the support structure; a hydraulic system; and a control system. The support structure further comprises lift apparatus to effect movement of the movable assembly relative to the support structure fixed member. The lift apparatus includes at least one ram/cylinder assembly. The hydraulic system includes a motor, a pump coupled to the motor to supply a pressurized fluid to the at least one ram/cylinder assembly, and at least one electronically controlled valve associated with the at least one ram/cylinder assembly. The control structure may estimate a speed of the movable assembly from a speed of the motor and control the operation of the at least one valve using the estimated movable assembly speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.