DEHB (Distributed Electro-hydraulic Braking System) Having a Holding Function 2015-01-0017
Many types of brake by wire systems have been developed in past years, such as EMB (Electro-mechanical Brake) [1, 2], DEHB (Distributed Electro-hydraulic Braking System)  and EWB (Electric Wedge Brake) . When the vehicle need braking in long period such as waiting for traffic light or downhill braking in those brake systems, the current will sustain very long time with very high level. This current will result in high temperature in motor, and will damage the power supplier. When a new DEHB is developing, a holding function is added in this DEHB. The holding function is self-energized when holding the brake, and automatic released after the brake. Advantageously, after activation of the holding function, the current delivered to the motor for braking is substantially decreased, especially, will be zero when the brake torque is not need to adjust. The holding function is fully mechanical, that means the holding function do not consume any power, and do not need to control it specially. The holding function can also be integrated into the other types of brake by wire systems. In this paper, prototype of the DEHB with holding function was described. The system is tested, which show the benefit in the power saving and motor requirements.