ABS Implementation using Steering Wheel Angle through CAN in LabVIEW

Shivangi Choudhary & Ashwati Krishnan

VIT University, Vellore

Abstract

An Anti-lock Braking System (ABS) is a safety system on motor vehicles which prevent the wheels from locking while braking. A typical ABS is composed of a central electronic control unit (ECU), four wheel speed sensors (one for each wheel), and two or more hydraulic valves within the vehicle brake circuit. The ECU constantly monitors the rotational speed of each wheel. Modern Electronic Stability Control (ESC or ESP) systems are an evolution of the ABS concept. Here, a minimum of two additional sensors are added to help the system work: these are a steering wheel angle sensor, and a gyroscopic sensor. The theory of operation is, when the gyroscopic sensor detects that the direction taken by the car does not coincide with what the steering wheel sensor reports, the ESC software will brake the necessary individual wheel(s) (up to three with the most sophisticated systems), so that the vehicle goes the way the driver intends.

The object of this project is to simulate the ABS with real-time data obtained from a steering angle sensor (while providing standard data from other sensors) using LabVIEW. The data will be obtained from the sensor through a Controller Area Network (CAN) module and processed in LabVIEW.