Cheon, J., Kim, J., and Jeon, J., "New Brake By Wire Concept with Mechanical Backup," SAE Int. J. Passeng. Cars - Mech. Syst. 5(4):1194-1198, 2012, doi:10.4271/2012-01-1800.
Brake-By-Wire (BBW) is a term used to describe next generation brake systems that rely on motor driven electro-mechanical calipers in place of conventional hydraulic components such as the booster, master cylinder, hydraulic unit, and parking brake. Instead the system configuration is simplified to a pedal simulator, electro-mechanical calipers that require no boosting, and electric control units. The active, highly-responsive, and independent control of the brake actuators at each wheel allows for great control flexibility and improved brake performance. It is also very well-suited for easy integration with cooperative regenerative braking and driver assistance functions.Although such potential and innovations have driven the interest and research into BBW systems through the years, it has yet to be successfully introduced in series production mainly due to the underlying perception of the lack of reliability of electronic components and overall cost concerns.In the current investigation, a new concept of BBW system is proposed as a step towards overcoming such hurdles. The proposed concept provides a mechanical backup function that does not deter the system from the original performance benefits of a BBW system. It is hoped that such an addition, which provides emergency braking capability with no electrical power, will give the BBW system the ultimate reliability that can help persuade its penetration into the brake market. This system also has the potential to reduce the overall cost of the system since reliance on complex system architectures, redundancies, and highly reliable electrical components can be reduced.This study will investigate the feasibility and basic performance of the proposed BBW concept. First, prototype actuators for the proposed system were designed and manufactured. After checking the samples in bench tests, the actuators were built into a car to access the braking capability of the system.