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Brake pressure profile for ABS braking without (blue line) and with (red line) consideration of brake hysteresis
Source publication
Control functions for the base-braking and emergency braking situations are important element of the vehicle active safety and have high requirements to robustness. The corresponding control algorithms should be reliable, provide sufficient level of system adaptiveness and be able to reject external disturbances. This demands not only the well-orga...
Citations
... IV. CASE STUDY Experimental works in this study were carried out according to Fig. 2 and [9] to investigate the feasibility of globally distributed X-in-the-Loop environments. A full vehicle simulation located in Japan was used as a master to integrate a brake dynamometer located in Germany as a slave. ...
... Schreiber et al. [8] use Ethernet to couple an electrohydraulic brake test bench and a brake dynamometer residing in the same local area network (LAN). Conversely in [9] an enginein-the-loop test rig located in Ann Arbor, MI, USA is coupled to a driver-in-the-loop ride motion simulator located in Warren, MI, USA via the Internet. Kloc et al. [10] and Franchi et al. [11] propose concepts for wireless HIL testing of automotive electronic control units where a vehicle does not have on-board control intelligence and communicates with a remote master computer while driving. ...
In recent years, advanced driver assistance systems (ADASs) have been used to improve the safety of vehicles by either providing additional information to the driver or by taking over complete control. The majority of ADASs currently being utilised run entirely on the vehicle, only having access to information provided by the sensors that are onboard the vehicle itself. Part of the next step in the evolution of ADAS is to incorporate information from other offsite sensors or obtain control inputs from infrastructure which can coordinate multiple vehicles simultaneously via a wireless interface. Wireless communication is inherently delayed and prone to dropped packets. This study looks at the effect of transport latencies and dropped packets on an off‐site autoregressive steering controller supplying direct steering inputs to a vehicle. A fully non‐linear vehicle simulation model is used to test the effect of delaying steering inputs and dropped packets to test the stability of the controller. The study shows that at dropped packet percentages of up to 40% adequate vehicle control is maintained, while transport latencies of up to 100 ms allow for moderately accurate vehicle control.
... Usually different types of test rigs are designed for special analysis of tire characteristics, suspension dynamics [1,2,3,4] or active safety systems operation such as anti-lock braking system (ABS) [5], traction control, active or semi-active suspension control [6,7] and others. The latter are combined with computerized control equipment setting up the hardware-in-the loop (HIL) system [8,9]. Laboratory conditions ensure required constant test environment and repeatability, special equipment availability, and sufficient comfort for researcher. ...
In the research of vehicle dynamics various specialized test rigs are designed for specific elements or systems analysis. Expecting the reliable results all possible uncertainties and side effects should be known in advance. In this paper the analysis of special designed quarter car test rig is presented before its further use in wheel/tire, suspension or its complex research. After explaining the construction, its operation and application an experimental modal analysis and validation of test rig with on-road driving was done in order to find out any uncertainties. Different performance in separate frequency ranges of specific construction locations is identified. This is explained by the influence of unsymmetrical inner frame, suspension side mounting and wheel rotation dynamics. Finally further research possibilities using designed test rig and its options for vehicle components and separate systems including control strategies are presented proving the importance of reliable dynamic tests in laboratory conditions before on-road driving.
... Previous sections illustrated only few examples of specific design procedures implemented by the development of the integrated chassis control within the EVE project. Additional, extended information about the project outcomes is presented in the consortium publications, among which several are mentioned here, as follows: dedicated to tyre modelling and testing [23]- [27], ICC hardware components [28]- [30], control methods for ICC and its subsystems [31]- [34], and vehicle and system testing procedures [35]- [36]. It should be noted that the project not only realized complex engineering task of efficient ICC design but brought a strong professional impact for research staff participated in the development activities. ...
The development of high-performance mechatronic systems as well as the strong demand for environment-acceptable and safe intelligent technologies have had a profound impact on vehicle engineering. This impact has resulted in both an increasing degree of automation of vehicular systems and the emergence of new concepts like integrated chassis control. To contribute to this topic, a consortium of several industrial and academic partners from EU, South Africa, and USA has performed consolidated research and innovation actions for the development of new integrated chassis control technologies within the framework of the European project EVE. This paper presents the main EVE outcomes related to the integration of active brake, suspension, and tyre pressure control. Attention is also given to the problems of vehicle and tyre modelling, state estimation, robust chassis control, and experimental validation tools.
