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Energies 2017, 10(12), 2052; https://doi.org/10.3390/en10122052

Unified Brake Service by a Hierarchical Controller for Active Deceleration Control in an Electric and Automated Vehicle

1
State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
2
China national institute of standardization, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Received: 2 November 2017 / Revised: 20 November 2017 / Accepted: 20 November 2017 / Published: 4 December 2017
(This article belongs to the Special Issue The International Symposium on Electric Vehicles (ISEV2017))
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Abstract

Unified brake service is a universal service for generating certain brake force to meet the demand deceleration and is essential for an automated driving system. However, it is rather difficult to control the pressure in the wheel cylinders to reach the target deceleration of the automated vehicle, which is the key issue of the active deceleration control system (ADC). This paper proposes a hierarchical control method to actively control vehicle deceleration with active-brake actuators. In the upper hierarchical, the target pressure of wheel cylinders is obtained by dynamic equations of a pure electric vehicle. In the lower hierarchical, the solenoid valve instructions and the pump speed of hydraulic control unit (HCU) are determined to satisfy the desired pressure with the feedback of measured wheel cylinder pressure by pressure sensors. Results of road experiments of a pure electric and automated vehicle indicate that the proposed method realizes the target deceleration accurately and efficiently. View Full-Text
Keywords: unified brake service; hierarchical control architecture; active deceleration control; automated driving system; wheel cylinder pressure unified brake service; hierarchical control architecture; active deceleration control; automated driving system; wheel cylinder pressure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nie, Y.; Liu, Y.; Cheng, S.; Mei, M.; Xiao, L. Unified Brake Service by a Hierarchical Controller for Active Deceleration Control in an Electric and Automated Vehicle. Energies 2017, 10, 2052.

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