DEVICE FOR DETECTING ABNORMALITY IN AMOUNT-OF-STATE DETECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To detect abnormality in two sensors reliably without any delay. ;SOLUTION: An abnormality-detecting device detects the failure in two stroke sensors for outputting an output voltage Vs that increases linearly and an output voltage Vs2 that decreases linearly as the actual step-in stroke of each brake pedal increases. In this case, time differential values Vs1d and Vs2d of the output voltages Vs12 and Vs2 are subjected to an operation (S220), a reference value As is subjected to an operation based on the time differential value Vs1d (S230), a sum Vsda of the time differential values Vs1d and Vs2d is subjected to an operation (S240), and it is judged whether the two stroke sensors are malfunctioning or not by discriminating whether the absolute value of the sum Vsda exceeds the reference value As or not (S250). The two pressure sensors detect the pressure of a master cylinder and at the same time similarly detect the failure in two pressure sensors for outputting an output voltage that increases non-linearly as the actual step-in stroke of the brake pedal increases.;COPYRIGHT: (C)2000,JPO