Shuji Shiraishi

Performance of Antilock Brakes with Simplified Control Technique

The four-wheel controlling antilock brake system is considered as an effective safety device because of its capability to help a driver to maintain vehicle stability and steerability during panic braking even on a slippery road surface. This report deals with a simplified control technique which simultaneously controls right and left wheels on each front or rear axle. Both front wheel with the least slip, while both rear wheels are controlled in response to a signal from the rear wheel that has the greatest slip. A series of tests proved that this technique ensures vehicle steering ability even during panic braking. On a gravel and other rough roads, this system provided shorter stopping distance compared to other four-wheel antilock systems. It has been generally assumed that stopping distance extension on such roads is only one disadvantage of the four-wheel antilock brake system.