Apparatus for detecting failures of longitudinal acceleration sensor.

摘要

An apparatus (K1) for detecting failures of a longitudinal acceleration sensor (GS) for detecting a longitudinal acceleration of a motor vehicle, comprising: a wheel speed calculating device (VCAL) for calculating wheel speeds (V0-V3) on the basis of outputs of wheel speed sensors (S0-S3); an estimated vehicle body acceleration calculating device (GCELCAL) for calculating an estimated vehicle body acceleration (Aw) on the basis of the wheel speeds (V0-V3); a comparative arithmetic device (COMP1) which calculates a ratio (Ac/Aw) of a vehicle body acceleration (Ac) calculated from an output (Am) of the longitudinal acceleration sensor (GS) to the estimated vehicle body acceleration (Aw) and calculates a first integrating value (T1) by performing a subtraction and an addition for the first integrating value (T1) when the ratio (Ac/Aw) falls within and out of a predetermined range (k1, k2), respectively; and a fail-safe device (FLSF) for performing a predetermined fail-safe processing if the first integrating value (T1) is larger than a predetermined value ( alpha 1, beta 1). <IMAGE> <IMAGE>