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Fischer, Daniel
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Model-Based Fault Detection for An Active Vehicle Suspension

DaimlerChrysler Research Center Frankfurt-Hans-Peter Schöner
Darmstadt University of Technology-Daniel Fischer, Rolf Isermann
  • Technical Paper
  • 2004-05-0054
Published 2004-05-23 by Society of Automotive Engineers of Korea in South Korea
Automobiles show an increasing number of mechatronic developments by the integration of mechanic and electronic systems. In the case of vehicle suspension systems, this comprises the application of hydraulic, pneumatic and/or electric actuators with the aim of active roll and pitch stabilization and an increase of driving safety and comfort in general. Supplementary, the integration of these actuators and the involved sensors and electronic control units enables a detailed process supervision, fault detection and identification (FDI) for the whole system. This was developed for an active vehicle suspension system on a test rig.The inquired active suspension is a hydraulic fully loaded active suspension, whereat a hydraulic plunger is added in series with the conventional steel spring. This assembly is equivalent to the Active- Body-Control System of DaimlerChrysler. The test rig is equipped with suitable sensors for a series passenger car. The goal is to detect faults of all involved sensors with the distinction of noise, outliers, breakdown, and also offset and gain faults.One approach to solve FDI problems is to use parameter estimation and parity…

Fault-Tolerant Filtering in Active Vehicle Suspensions

DaimlerChrysler Research Center-Eberhard Kaus
Darmstadt University of Technology-Daniel Fischer, Rolf Isermann
  • Technical Paper
  • 2004-05-0180
Published 2004-05-23 by Society of Automotive Engineers of Korea in South Korea
The problem considered in this paper is the design and analysis of a sensor fault-tolerant filtering method for active vehicle suspensions. As the suspension system of an automotive vehicle influences driving comfort and safety, a reliable operation of the system is required.Components, sensors and actuators in physical systems are often subject to unexpected and not permitted deviations from acceptable/usual/standard conditions. These deviations are called faults. Faults can cause the loss of the overall performance of a physical system, which may present hazards to personnel or lead to unacceptable economic loss. The aim of the fault-tolerant control is to adjust or to modify on-line the nominal control laws in order to maintain the safety of the operators and the reliability of the process.This paper aims at investigating the design of a sensor fault- tolerant filtering method mainly because: (1) sensors are critical components in almost all modern engineering system; (2) a sensor fault- tolerant filter can, in principle, indirectly solve the problem of sensor fault-tolerant control. In fact, from the control point of view, sensor fault-tolerant…