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Machine translation
1. (WO1980001400) ANTI-STALL CONTROLLER
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001400    International Application No.:    PCT/US1979/001140
Publication Date: 10.07.1980 International Filing Date: 13.12.1979
IPC:
F04B 49/06 (2006.01), F16H 61/46 (2010.01)
Applicants:
Inventors:
Priority Data:
1809 08.01.1979 US
Title (EN) ANTI-STALL CONTROLLER
(FR) CONTROLEUR ANTI-CALAGE
Abstract: front page image
(EN)Control system for a hydrostatic transmission of the type including a prime mover driven variable displacement pump, the displacement of which is controlled by a pair of strokers (28, 30). Flow of pressurized control fluid from the charge pump to one of the strokers, and from the other stroker to tank, is controlled by a main control valve (34). The control system includes an auxiliary control valve (44) defining passages (98, 100, 102) communicating between the lines connecting the main control valve and the strokers. The auxiliary control valve includes an on-off, electro-hydraulic valve (46) which prevents flow through the auxiliary valve in response to an electrical signal in one condition, and permits flow in response to an electrical signal in another condition. The electrical signals to the electro-hydraulic valve are generated by control logic (52) which alternates the electric signal between the one condition and the other condition at a duty cycle which varies proportional to the amount of pump destoke needed to prevent stalling of the prime mover.
(FR)Un systeme de controle pour une transmission hydraulique du type comprenant une pompe a deplacement variable mu par un premier moteur, le deplacement de celle-ci etant commande par une paire de poussoirs (28, 30), Le debit du fluide pressurise de controle d"une pompe de charge a l"un des poussoirs et de l"autre poussoir vers le reservoir est controle par une soupape principale de controle (34). Le systeme de controle comprend une soupape auxiliaire de controle (44) definissant des passages de communication (98, 100, 102) entre les tuyaux reliant la soupape principale de controle et les poussoirs. La soupape auxiliaire de controle comprend une soupape ouvert-ferme, electro-hydraulique (46) qui empeche la circulation au travers de la soupape auxiliaire en reponse a un signal electrique dans une condition et permet la circulation en reponse a un autre signal electrique dans une autre condition. Les signaux electriques vers la soupape electro-hydraulique sont engendres par un controle logique (52) qui alterne le signal electrique entre l"une et l"autre conditions dans un cycle de travail qui varie proportionnellement a la quantite de deplacements de la pompe necessaire pour eviter le calage du moteur primaire.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)