Electronic constant speed control for a hydrostatic transmission
US4351152A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1979 |
| Grant date | Sep 28, 1982 |
| Priority date | — |
| Expiry date | Sep 24, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S60/911
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electronic constant speed control for a hydrostatic transmission having a variable displacement hydraulic pump with a displacement controlling member movable to various positions at either side of a neutral position and having an input shaft connectable to a prime mover and a hydraulic motor having an output shaft, an electric controller for positioning siad displacement controlling member, a command potentiometer for establishing a set constant speed signal representing a desired constant speed between zero and maximum speed in either direction of rotation for said output shaft, a speed detecting device for establishing a pump input shaft speed signal, a circuit for generating a position control signal representing the required position of the displacement controlling member for the set speed which is responsive to the constant speed and pump input shaft speed signals, a speed detecting device for establishing an output shaft speed signal, a circuit for comparing the output shaft speed signal with said set constant speed signal and integrating any error therebetween and generating a speed error control signal, and a summing circuit for summing said position and speed error cont…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.