To provide a room pressure controlling system extending the service life of a valve having a PCV (Positive Crankcase Ventilation) function, and extending the operating time and maintenance cycle of the whole system.
This room pressure controlling system includes a local exhaust valve EXV, an air supply valve MAV, a general exhaust valve GEX, controllers 105, 106, 107, and a differential pressure sensor 109. The controller 107 calculates a correction control output value with respect to one actuated as a room pressure control valve of the air supply valve MAV and general exhaust valve GEX based on room pressure measured by the differential pressure sensor 109 and a set value. The controller 107 determines whether or not at least one of supply air volume and exhaust air volume is being changed. If air volume is being changed, the controller 107 performs control calculation emphasizing readiness of room pressure control more than a reduction in the number of operation times of the room pressure control valve. If the air volume is being stabilized, the controller 107 performs control calculation emphasizing the reduction in the number of operation times of the room pressure control valve more than the readiness of the room pressure control.
OMAGARI YASUHITO
OMURA RINTARO
| JPH09201540A | 1997-08-05 | |||
| JPS62105447U | 1987-07-06 | |||
| JP2012021663A | 2012-02-02 | |||
| JP2006078010A | 2006-03-23 | |||
| JP2008224178A | 2008-09-25 |
Shigeki Yamakawa