It has been shown that loss of directional control arising from "panic"breaking occurs in many road accidents and that this can be frequently attributed to the locking of the rear wheels. It is difficult to overcome this problem by desior variation of brake distribution, but breaking techniques can help to some extent. Fitting anti locking breaking systems to control the breaking at the wheels offers prospects of considerable improvement in directional control and kin breaking performance. Controlling only the rear wheels by anti locking devices can prevent large uncontrollable angular deviations during breaking, but little or no reduction in breaking distance is obtained and steering control is not always retained. Controlling all wheels not only retains directional stability but also provides a means by shish advantage may be taken of the substantially higher breaking coefficient between tire and road, which occurs just before a wheel locks. A number of anti locking systems have been proposed, most of which use a rotational inertia sensing unit to provide the signal for operating the anti locking device. One proposed system uses a signal obtained from the brake reaction at each wheel. Anti locking breaking systems merit special consideration as a means of improving directional control and breaking performance, and that making vehicles safer.
Abstract