Materials handling vehicle estimating a speed of a movable assembly from a lift motor speed
US9751740B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 2015 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Aug 3, 2035 |
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 first 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 first 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 ram/cylinder assembly. The control structure may estimate a speed of the movable assembly from a speed of the motor and may control the operation of the at least one valve using a comparison involving the estimated movable assembly speed and a determined speed, and the comparison may not involve use of an operator commanded speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.