Using the very old idea, the wedge, there is a good opportunity to realize the self-amplified system. The basic idea is that the rotation energy of the brake disc can be used as an actuation source for the brake system. In this way, the additional actuation force comes with the intervention of friction. The value of the friction coefficient varies in a very wide range, and its effect is very important from the viewpoint of the control algorithm. The system can come to the instable state easier if the coefficient of frictionwedge angle pairs produce self-locking state. In order to analyse the behaviour of this self-energizing brake system, a mechanical model has been created including the accurate description of friction characteristics.This paper focuses on the modelling steps of the self-energizing wedge brake. A complete parameter analysis will be demonstrated in order to understand the model. The stability conditions of the model will be analysed.
In this paper an air path model is presented for control system design. The model was developed for direct injected, turbocharged and intercooled commercial vehicle diesel engines which are equipped with compressed air booster system (PBS R -Pneumatic Booster System) [12], high pressure exhaust gas recirculation (EGR) with EGR-cooler and exhaust brake (EB). Current and next generation emission standards introduced significant limitations for NO x and soot. It is challenging to handle these components, especially at transient engine operations. Nitric oxide formation can be limited with an appropriate amount of exhaust gas recirculation. Soot formation is influenced mainly by the air-fuel ratio of the mixture which can be affected by the intake manifold pressure. Therefore with the targeted design of a suitable air path controller the modeled engine setup is able to handle both the NO x and soot formation in transient cases. The reported model is the first step of this work. KeywordsDiesel engine · Air path system · EGR · Compressed air booster · Turbo-lag · Model-based control AcknowledgementThe work is connected to the scientific program of the "Development of quality-oriented and harmonized R+D+I strategy and functional model at BME project. This project is supported by the New Széchenyi Plan (
A spectacular measurement campaign was carried out on a real-world motorway stretch of Hungary with the participation of international industrial and academic partners. The measurement resulted in vehicle based and infrastructure based sensor data that will be extremely useful for future automotive R&D activities due to the available ground truth for static and dynamic content. The aim of the measurement campaign was twofold. On the one hand, road geometry was mapped with high precision in order to build Ultra High Definition (UHD) map of the test road. On the other hand, the vehicles—equipped with differential Global Navigation Satellite Systems (GNSS) for ground truth localization—carried out special test scenarios while collecting detailed data using different sensors. All of the test runs were recorded by both vehicles and infrastructure. The paper also showcases application examples to demonstrate the viability of the collected data having access to the ground truth labeling. This data set may support a large variety of solutions, for the test and validation of different kinds of approaches and techniques. As a complementary task, the available 5G network was monitored and tested under different radio conditions to investigate the latency results for different measurement scenarios. A part of the measured data has been shared openly, such that interested automotive and academic parties may use it for their own purposes.
This paper will discuss the fundamentals of a detailed injector and injection rate meter simulation model, and their use in a sensitivity analysis of a Bosch rate of injection meter. The Bosch-and Zeuch-methods for instantaneous injection rate measuring are going to be discussed and a practical comparison will be presented.The injector model is simulating a common rail injector, which will be later used as an input for a detailed Diesel combustion model. The purpose of the injection meter is to validate the injector model.The influence of geometric parameters showed changes in the calculated instantaneous injection volumetric flow rate, due to the modified pressure waves. These geometric features contain the diameters and length of bench pipes, the size of throttle valve, the positioning of the pressure sensor. From these the best trade off parameter set shall be chosen.
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