Safe over-center pump/motor

F - Mech Eng,Light,Heat,Weapons – 15 – B

Patent

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Details

F15B 1/02 (2006.01) B60K 6/12 (2006.01) F04B 1/32 (2006.01) F04B 49/00 (2006.01) F04B 49/10 (2006.01) F15B 20/00 (2006.01) F16H 61/40 (2006.01) F16H 61/42 (2006.01)

Patent

CA 2664764

A fail-safe system for a hybrid vehicle employing an over-center variable-displacement hydraulic motor includes an actuator configured to stroke the motor to a zero angle if each of two control ports is supplied with fluid at an equal pressure. A control valve is configured, in the event of loss of power to the valve, to default to a position in which high-pressure fluid is supplied to both control ports. A pilot-controlled check valve is coupled between high- and low-pressure ports of the motor such that, during normal operation, passage of fluid through the check valve from the high-pressure port to the low-pressure port is checked, while passage of fluid through the check valve from the second port to the first port is enabled. When the pilot control is activated, passage of fluid in the opposite direction is also enabled.

L'invention concerne un système à sécurité intégrée destiné à un véhicule hybride faisant intervenir un moteur hydraulique à déplacement variable surcentré. Ce système comprend un actionneur conçu pour frapper le moteur à un angle zéro si chacun des deux ports de commande est alimenté par du fluide à pression égale. Une soupape de commande est conçue, dans le cas d'une perte de puissance arrivant à la soupape, pour se mettre en défaut à une position à laquelle le fluide haute pression est fourni aux deux ports de commande. Une soupape de non-retour commandée par un pilote est accouplée entre le port haute pression et le port basse pression du moteur de sorte que, lors d'un fonctionnement normal, le passage du fluide par la soupape de non-retour est bloqué du port haute pression jusqu'au port basse pression, tandis que le passage de fluide par la soupape de non-retour est activé du second port au premier port. Lorsque la commande pilote est activée, le passage du fluide dans la direction opposée est également activé.

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