Patent ID: 7260496
Filing Date: 2007-08-21
Classification: G01L,Y10T

Abstract:
1. A pressure detector for detecting a high side pressure from a high pressure side impulse line and a low side pressure from a low pressure side impulse line, the pressure detector comprising: a differential pressure calculating section for calculating a differential pressure signal (X) based on a differential pressure of the high side pressure and the low side pressure; a differential pressure fluctuation calculating section for calculating a differential pressure fluctuation (F a differential pressure variance calculating section for calculating a differential pressure variance (V a high side pressure calculating section for calculating a high side pressure signal (Y a high side pressure fluctuation calculating section for calculating a high side pressure fluctuation (F a high side pressure variance calculating section for calculating a high side pressure variance (V a low side pressure calculating section for calculating a low side pressure signal (Y a low side pressure fluctuation calculating section for calculating a low side pressure fluctuation (F a low side pressure variance calculating section for calculating a low side pressure variance (V a first rate calculating section for calculating a first diagnosis variable (Z a second rate calculating section for calculating a second diagnosis variable (Z a third rate calculating section for calculating a third diagnosis variable (Z a fourth rate calculating section for calculating a fourth diagnosis variable (Z a fifth rate calculating section for calculating a fifth diagnosis variable (Z a first determining section for determining blockage of the high pressure side impulse line or blockage of the low pressure side impulse line based on a value of the first diagnosis variable (Z a second determining section for determining blockage of the high pressure side impulse line or blockage of the low pressure side impulse line based on a value of the second diagnosis variable (Z a third determining section for determining blockage of the high pressure side impulse line or blockage of the low pressure side impulse line based on a value of the third diagnosis variable (Z a fourth determining section for determining blockage of the high pressure side impulse line or blockage of the low pressure side impulse line based on a value of the fourth diagnosis variable (Z a fifth determining section for determining blockage of the high pressure side impulse line or blockage of the low pressure side impulse line based on a value of the fifth diagnosis variable (Z