Technical Brief

Fault Detection and Estimation for Electromechanical Brake Systems Using Parity Space Approach

[+] Author and Article Information
Woohyun Hwang

Department of Automotive Engineering,
Hanyang University,
17 Haengdang-dong,
Seongdong-gu, Seoul 133-791, South Korea

Kunsoo Huh

Department of Automotive Engineering,
Hanyang University,
17 Haengdang-dong,
Seongdong-gu, Seoul 133-791, South Korea
e-mail: khuh2@hanyang.ac.kr

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received July 29, 2013; final manuscript received August 4, 2014; published online August 28, 2014. Assoc. Editor: Shankar Coimbatore Subramanian.

J. Dyn. Sys., Meas., Control 137(1), 014504 (Aug 28, 2014) (7 pages) Paper No: DS-13-1291; doi: 10.1115/1.4028184 History: Received July 29, 2013; Revised August 04, 2014

In future, existing hydraulic braking systems will be replaced by electronic braking systems called brake-by-wire (BBW). The BBW units such as electromechanical brake (EMB) are lighter than hydraulic brakes and relatively faster in response. However, the most important issue for adopting BBW units to vehicle is the reliability of their performance. Partial or complete failure of the BBW units can cause not only dangerous situations but also liability for damages. In this study, a sensor fault diagnosis method is proposed by combining parity space and observer design approaches for EMB sensors; current sensor and position (or speed) sensor. The residual generator is constructed to detect sensor faults and fault sizes are estimated using the generated residual information. The EMB model as well as the proposed fault detection and estimation methods is verified in the EMB hardware-in-the-loop simulation (HILS) test bench.

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Fig. 1

Schematic view of the EMB hardware

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Fig. 2

Structure of residual generator via parity space approach

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Fig. 3

Integrated fault detection algorithm

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Fig. 4

Structure of residual generator for fault estimation

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Fig. 5

Experimental setup of the EMB test bench

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Fig. 6

Validation of the EMB model

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Fig. 7

Parity residual with current sensor fault

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Fig. 8

Observer residual with current sensor fault

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Fig. 9

Fault size estimation of the current sensor (offset 20 A)

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Fig. 10

Fault size estimation of the speed sensor (offset 300 rad/s)




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