Patent ID: 7263427
Filing Date: 2007-08-28
Classification: F02B,F02D,Y02T

Abstract:
1. A failure diagnostic method for manifold pressure sensors used in an engine control system having a first manifold pressure sensor that performs main control, a second manifold pressure sensor that backs up the first manifold pressure sensor, an atmospheric pressure sensor, an engine revolution detector, and a throttle sensor, said method comprising the steps of: calculating an estimated manifold pressure on the basis of engine revolution, a throttle opening, and an atmospheric pressure value; determining that a failure has occurred when a difference between an output from the first manifold pressure sensor and an output from the second manifold pressure sensor exceeds a predetermined range; and identifying which one of the first and second manifold pressure sensors has failed by determining which of the first and second manifold pressure sensors has a larger difference between the output and the estimated manifold pressure.