The development of a technique for carrying out road and bench tests on the brake system components of vehicles and their simulation with the use of a modern computer environment and software are actual scientific problems. This paper describes different ways for carrying out road and bench tests on the brake systems of vehicles with the help of the hardware-in-the-loop technique. It covers the following issues: substantiation of positive feedback introduction into disc brakes to provide a self-boosting effect; the concept of disc brake design with self-boosting which has minimal hysteresis and a very rapid rate and can be used for different types of vehicle brake system; estimation of the dependence of the brake system’s efficiency for a medium-duty truck on the hysteresis value of the disc brakes with the help of bench tests (the analytical dependences of the braking distance on the relative change in the hysteresis will be obtained and can be used for definition of the brake system’s efficiency in accordance with the hysteresis value of the disc brakes); analysis of the self-boosting influence of the disc brakes on the brake system’s efficiency of a truck tractor on the basis of road test results. To a first approximation it will be substantiated that the efficiency of the vehicle’s brake system can be enhanced using the proposed disc brake with self-boosting.
Up-to-date automotive brake systems place stringent requirements upon the performance, reliability, and active safety. Such advanced systems as antilock braking systems (ABS), the electronic stability programme system, and the anti-slip control system assist a driver in ensuring driving safety under many conditions. The influence of the brake components on active safety systems is mainly determined through the hysteresis loop width. Among other negative outcomes, this parameter limits the possible frequency of cyclic braking during ABS operation.This paper presents an experimental analysis of the factors influencing the hysteresis pressure losses in a hydraulic brake system. The factors under investigations are the brake pedal stroke velocity, the gaps between the brake pads and the brake disc, and the configuration of the brake system. Experiments were carried out on the brake test equipment at the
A new library for System Reliability Analysis for systematic modelling of fault effects in multi-physical systems is introduced. The motivation is outlined as well as a description of the library structure with two helper libraries and an Add-In for semi-automatic fault augmentation. The library is exemplified in the automotive domain with the fault effect simulation of a vehicle model by using a new library for Driving Maneuvers. The vehicle model is systematically augmented with connector and component faults for the analysis of different fault effects in vehicle dynamics.
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