Abstract
This paper has presented hard braking control system based on Adjustable Gain Enhanced Fuzzy Logic Controller (AGE-FLC) for optimal wheel slip ratio tracking performance. The purpose of the study was to improve slip ratio tracking and eliminate cycling while achieving very much shortened distance during emergency braking. The model of a braking vehicle at speed of 30 m.s^-1 subject to wheel locking was developed and implemented in MATLAB/Simulink environment. Simulation was conducted without a controller to study the slip ratio performance of the system on different road surfaces. The simulation results showed that stopping distance was 135.2 m in 5 seconds. A Fuzzy Logic Controller (FLC) whose control signal was enhanced by adding an adjustable gain mechanism to its output was designed. Simulation results showed that the AGE-FLC controller offered optimal tracking of desired wheel slip ratio of 0.1 as fast as possible on all road surface scenarios, while improving the stopping distance by 70.4% on dry road surface, 63.3% on wet road surface, 57.5% on cobblestone road surface and 48.8% on snow road surface in 2.651seconds.
Highlights
In automobile production, there is an increasing demand to ensure passenger safety, fuel economy and building confidence in company’s brand in the highly competitive market
The Antilock Braking System (ABS) ensures that an effective grip is realised between a tyre and the road surface during emergency or hard braking
This paper proposes an Adjustable Gain Enhanced Fuzzy Logic Controller (AGE-Fuzzy Logic Controller (FLC)) for optimal wheel slip ratio tracking in vehicles during severe braking in different road surface conditions
Summary
There is an increasing demand to ensure passenger safety, fuel economy and building confidence in company’s brand in the highly competitive market. Automobile manufacturers have introduced a technology called Vehicle Traction Control System (VTCS) that offers traction and tracking control in accelerating and braking modes. VTCS offers very important function in Electronic Stability Control (ESC) system. Two forms of vehicle traction control mechanisms are used to improve the traction performance of vehicle on road surfaces with adverse conditions. These are Traction Control System (TCS) and Antilock Braking System (ABS). In TCS, the objective is to maintain an optimal grip of a tyre on road surface while the vehicle accelerates. The ABS ensures that an effective grip is realised between a tyre and the road surface during emergency or hard braking
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