A Novel Double Redundant Brake-by-Wire System for High Automation Driving Safety: Design, Optimization and Experimental Validation

Actuators

Junzhi Zhang¹  Xiaohui Hou¹  Chao Li¹  Jinheng Han¹  Chengkun He¹  Yuan Ji¹  Jiangmai Hao² 

[1] State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;Zhejiang Asia-Pacific Mechanical & Electronic Co., Ltd., Hangzhou 311203, China;

关键词: brake-by-wire system;    autonomous driving;    high safety;    redundancy design;    development and validation;   

DOI  :  10.3390/act10110287

来源: DOAJ

【 摘 要 】

The high redundant brake-by-wire system reveals vehicular safety handling ability and rarely emerges in the automotive area at the present time. This paper presents a novel brake-by-wire system, DREHB (Double Redundant Electro-Hydraulic Brake), with extensible fail-safe operations for high-automation autonomous driving vehicles. The DREHB is designed as a decoupled-architecture system containing three-layer cascaded modules, including a hydraulic power provider, a hydraulic flow switcher, and a hydraulic pressure modulator, and each of the modules can share dual redundancy. The operating principles of the DREHB in normal and degraded initiative braking modes are introduced, especially for the consideration of fail-safe and fail-operational functions. The matching and optimization of selected key parameters of the electric boost master cylinder and the linear solenoid valve were conducted using computer-aided batched simulations with a DREHB system modeled in MATLAB/Simulink and AMESim. The prototype of the DREHB was tested in hardware-in-the-loop experiments. The test results of typical braking scenarios verify the feasibility and effectiveness of the DREHB system, and the hydraulic pressure response as 28.0 MPa/s and tracking error within 0.15 MPa and the desirable fail-safe braking ability fully meets the requirements of higher braking safety and efficiency.

【 授权许可】

Unknown