Patent ID: 7771113
Filing Date: 2010-08-10
Classification: G01K

Abstract:
1. A sensor diagnostic method comprising: causing a first sensor to sense a first condition value, a second sensor to sense a second condition value, and a third sensor to sense a third condition value; measuring a first condition difference between the first and second condition values; determining whether the first condition difference falls within a first threshold range; measuring a second condition difference between the second and third condition values; determining whether the second condition difference falls within a second threshold range; comparing the first condition difference to the second condition difference to determine the rationality of the first sensor, the second sensor, and the third sensor; and identifying at least one of the first sensor, the second sensor, and the third sensor as irrational where one of the first condition difference and the second condition difference falls outside the first threshold range and the second threshold range respectively; wherein if the first condition difference falls below the first threshold range and the second condition difference falls below the second threshold range, at least two of the sensors are determined to be irrational.