School bus door/service brake interlock retrofit system

B - Operations – Transporting – 60 – T

Patent

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Details

B60T 17/22 (2006.01) B60T 7/12 (2006.01) B60T 13/68 (2006.01) B60T 15/36 (2006.01) B60T 17/18 (2006.01)

Patent

CA 2415160

A bus door/service brake interlock system having a warning system is provided to inform a driver that the service brake pressure is insufficient or not being applied at all, as well as indicating if a system malfunction occurs, precluding a service brake application. The system is based on a sequential operation of the driver activating the caution lights and opening the door. Once these events have occurred, the autobrake system (70) including an alarm (90) is activated. On the other hand, applying the park brake (56) deactivates the autobrake system. The autobrake assembly energizes a solenoid (76) that receives regulated pressure from a pressure reducing valve (72). This pressure is supplied to one side of a double check valve (78), while the other side receives a delivery from the foot valve (24) to assure delivery for normal service braking.

La présente invention concerne un système de verrouillage de porte/frein de service d'un autobus comportant un système d'alarme destiné à indiquer à un conducteur que la pression de frein de service est insuffisante ou est hors service, ainsi qu'à indiquer un dysfonctionnement du système, empêchant le serrage normal du frein de service. Le système est basé sur une opération séquentielle du conducteur qui consiste à actionner les voyants d'avertissement et à ouvrir la porte. Lors de la survenance de ces événements, le système de freinage automatique comprenant un signal d'alarme est activé. D'autre part, l'actionnement du frein de stationnement désactive le système de freinage automatique. L'ensemble de freinage automatique alimente un solénoïde qui reçoit une pression ajustée à partir d'un détendeur. Cette pression est alimentée vers un côté d'une soupape à double effet, tandis que l'autre côté reçoit un débit à partir du robinet de commande au pied permettant d'assurer un débit pour le freinage au pied normal.

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