Overspeed control system for a hydro-mechanical drive system
US5996343A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1998 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Nov 12, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2037/0886
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In one aspect of the present invention, an apparatus for controlling the negative load of an engine is disclosed. The engine is drivingly connected to a hydro-mechanical drive system that includes a variable displacement pump and motor. An engine speed sensor senses the rotational speed of the engine and produces an actual engine speed signal indicative of the rotational engine speed. A travel speed sensor senses the travel speed of the machine and produces an actual travel speed signal indicative of the machine travel speed. An overspeed controller compares the actual engine speed signal to a proportional and integral threshold, produces a proportional and integral error signal indicative of the difference between the actual engine speed signal magnitude and the corresponding thresholds, calculates a proportional and integral control signal from the corresponding errors, combines the proportional and integral control signals and responsively produces a command signal. A displacement controller receives the command signal and responsively controls one of the variable pump and motor to regulate the negative engine load to optimize the retarding power of the engine without overspeedi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.