The Measurement of Wheel Speed Signal in Vehicle Anti-lock Braking System

摘要

By analyzing the properties of the output signal of the electromagnetism induction sensor, which is used to measure wheel speed in vehicle anti-lock braking system, this paper proposes a kind of circuit that can satisfy the requirements of the system. The design is completed and simulated with the aid of PSPICE, an effective analog and digital circuit design software. The source of measurement error mainly includes three parts, which is count error, time-base error and trigger error. The three errors change according to amplitude and frequency of the measurement signal. In the premise of guaranteeing system requirements, multi-periods method is utilized to improve the measurement precision.