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Electro-pneumatic control valve for pneumatic door actuator
| Details |
Inventors: Klatt, Alfred; Singbartl, Gunther;
Assignee: WABCO Fahrzeugbremsen GmbH (Hanover, DE)
Primary Examiner: Schwadron; Martin P.
Assistant Examiner: Klein; Richard L.
Attorney, Agent or Firm: Falce; G. J.
A vehicle door control valve device having a pair of two-way, electro-magnetically operated, pneumatic valve members arranged so that one valve member is operated to a first position, in which compressed air is supplied to one side of a pneumatic actuator that operates the door, while concurrently, a second identical valve member is operated to an opposite position, in which compressed air is exhausted from the other side of the pneumatic door actuator. The relative positions of the respective valve members may be alternately switched to effect door opening and closing. Operation of the valve members is electro-magnetically controlled by primary and secondary coils arranged to cooperate with a permanent magnet, so that only momentary energization of the coils is necessary to effect switching of the valve members. The arrangement is such that in the case of an emergency, opposite sides of the pneumatic door actuator are both de-pressurized to permit manual door operation. |
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DETAILED DESCRIPTION The object of the present invention is to provide a pair of two-way, solenoid operated pneumatic valves of the impulse type arranged so that when one valve opens, the other closes and vice-versa.
A further object of the invention is to arrange the solenoid operated pneumatic valves so that in an emergency, both sides of the pneumatic actuator piston may be depressurized to permit manual operation of the vehicle door.
In meeting the above objectives, there is provided in a common housing a pair of two-way, solenoid operated pneumatic valves, each having a first position in which a supply valve is closed and an exhaust valve is opened.
A primary coil for each valve is arranged so that upon energization, the respective valve is moved from its first position to a second position in which the valving is reversed.
A permanent magnet is effective to maintain the valve in this second position following de-energization of the primary coil, so as to require only momentary energization to effect valve reversal.
A secondary coil is arranged to counteract the holding effect of the permanent magnet when momentarily energized, in order to allow a return spring to move the valve to its first position.
The foregoing arrangement lends itself to a control arrangement in which the primary coil of one valve is energized simultaneously with de-energization of the secondary coil of the other valve, and vice-versa.
In this manner, the delivery lines to opposite sides of a pneumatic actuator may be alternately pressurized and depressurized to effect opening and closing of the vehicle door, without requiring continuous energization of the respective valve solenoids.
Moreover, the arrangement further lends itself to momentary energization of the secondary coils of each solenoid operated valve, so as to cause each valve to assume its first position in which the respective sides of the pneumatic actuator are both exhausted, in order to permit manual operation of the door, in the event of an emergency such as a passenger or other obstacle being stuck in the doorway to prevent proper door operation
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