A Study on Optimization of Brake Feeling and Method for Flexible Brake with Integrated Electronic Booster 2020-01-1642
Throughout the automotive industry, the application of an integrated electronic booster (IEB) system has been actively applied following with diversify powertrain types and expand autonomous vehicles. Compared to the existing vacuum boosters, the performance advantages of IEB are 1) robustness against environmental changes, 2) rapid hydraulic reactivity, etc., and the advantages of cost / university are 1) flexibility for powertrain changes 2) weight saving 3) package simplification. Although IEB has a great advantage in performance and cost, it still needs a lot of research in various fields to realize the braking feeling, which is the performance of the emotional aspect, similar to the existing system.
The braking feeling of the existing system was determined by the mechanical action of the hardware connected from the input device, the brake pedal to the hydraulic line. However, IEB system has a completely different structure from the existing system. The brake pedal and the hydraulic line are not directly connected, and the motor senses the user's will with various sensors to form the hydraulic pressure. Due to this structure, the braking feeling of the IEB system is relatively flexible in tuning, and it is possible to implement a variable brake pedal feeling depending on the situation depending on the system configuration.
In order to overcome the structural difference in aspect of hardware and realize a brake feeling similar to vacuum booster, the electric booster generally includes a simulator or a emulator. You can optimize the braking feeling by adjusting the shape and physical properties of the simulator components. In addition, it is possible to implement various braking feelings in the same hardware system by controlling the user's willingness to control.
In this study, we studied a method of implementing an optimized braking feeling by changing hardware and control amount in a vehicle with an IEB. In addition, the method of implementing a flexible brake feeling capable of realizing a change in braking force according to a user's request was studied.