Improving yaw dynamics by feedforward rear wheel steering

Active rear wheel steering can be applied to improve vehicle yaw dynamics. In this paper two possible control algorithms are discussed. The first method is a yaw rate feedback controller with a reference model, which has been reported in a similar form previously in literature. The second controller is a feedforward controller, which only requires the front wheel steering angle and vehicle forward velocity. It has a similar performance as the feedback controller. Both controllers are evaluated using an enhanced bicycle model, which includes tyre relaxation behaviour and suspension steering compliance

Modeling, analysis and control of a variable geometry actuator

A new design of variable geometry force actuator is presented in this paper. Based upon this design, a model is derived which is used for steady-state analysis, as well as controller design in the presence of friction. The controlled actuator model is finally used to evaluate the power consumption under worst case conditions. © 2008 IEEE

Vehicle State Estimator based regenerative braking implementation on an electric vehicle to improve lateral vehicle stability

The driving range of electric vehicles can be extended using regenerative braking. Regenerative braking uses the electric drive system, and therefore only the driven wheels, for decelerating the vehicle. Braking on one axle affects the stability of the vehicle, especially for road conditions with reduced friction. This paper discusses three control strategies for preventing loss of stability while applying regenerative braking, two of which are using a state estimation algorithm developed by TNO. Experiments have been conducted with a front wheel driven vehicle on a low friction test track. The conclusions concerning the control concepts are however based on simulation results, due to unexpected system behaviour of the test vehicle. The results also indicate that the effectiveness of regenerative braking can be improved in cornering situations by using the vehicle yaw rate as a control signal. Due to hardware limitations, it has not been possible to rank the performance of the individual regenerative braking controllers in practise. It is recommended to further study the control concepts using an improved hardware setup

Long-term yield of pancreatic cancer surveillance in high-risk individuals

Objective We aimed to determine the long-term yield of pancreatic cancer surveillance in hereditary predisposed high-risk individuals. Design From 2006 to 2019, we prospectively enrolled asymptomatic individuals with an estimated 10% or greater lifetime risk of pancreatic ductal adenocarcinoma (PDAC) after obligatory evaluation by a clinical geneticist and genetic testing, and subjected them to annual surveillance with both endoscopic ultrasonography (EUS) and MRI/cholangiopancreatography (MRI/MRCP) at each visit. Results 366 individuals (201 mutation-negative familial pancreatic cancer (FPC) kindreds and 165 PDAC susceptibility gene mutation carriers; mean age 54 years, SD 9.9) were followed for 63 months on average (SD 43.2). Ten individuals developed PDAC, of which four presented with a symptomatic interval carcinoma and six underwent resection. The cumulative PDAC incidence was 9.3% in the mutation carriers and 0% in the FPC kindreds (p<0.001). Median PDAC survival was 18 months (range 1-32). Surgery was performed in 17 individuals (4.6%), whose pathology revealed 6 PDACs (3 T1N0M0), 7 low-grade precursor lesions, 2 neuroendocrine tumours <2 cm, 1 autoimmune pancreatitis and in 1 individual no abnormality. There was no surgery-related mortality. EUS detected more solid lesions than MRI/MRCP (100% vs 22%, p<0.001), but less cystic lesions (42% vs 83%, p<0.001). Conclusion The diagnostic yield of PDAC was substantial in established high-risk mutation carriers, but non-existent in the mutation-negative proven FPC kindreds. Nevertheless, timely identification of resectable lesions proved challenging despite the concurrent use of two imaging modalities, with EUS outperforming MRI/MRCP. Overall, surveillance by imaging yields suboptimal results with a clear need for more sensitive diagnostic markers, including biomarkers

Eigenschappen van volledig elektrische personenwagens

This presentation discusses the characteristics of battery electric vehicles. Plug-to-wheel efficiency, battery mass, charging, range (constant speed and driving cycle) and performance are discussed. Presentation is in Dutch

Vehicle Dynamics analysis using SimMechanics and TNO Delft-Tyre

This paper explores the usage of the MATLAB/Simulink multibody toolbox SimMechanics for vehicle dynamics analysis. The tyre model and some general issues when creating vehicle models in SimMechanics are discussed. Finally three examples are given: a motorcycle, racing car and truck model

Battery Electric Vehicles: characteristics and research projects

This presentation discusses briefly the history of the electric car and its main characteristics. Two projects introduced: the battery electric VW Lupo EL and URE05e electric Formula Student racecar. Presentation slides

Elektrisch rijden: consequenties voor het ontwerp van de auto

This presentation gives an introduction to the main characteristics of battery electric vehicles. A comparison between an efficient diesel vehicle and the battery electric conversion is made. (Presentation is in Dutch

Battery Electric Vehicles: characteristics and research projects

This presentation discusses briefly the history of the electric car and its main characteristics. Two projects introduced: the battery electric VW Lupo EL and URE05e electric Formula Student racecar. Presentation slides

Eigenschappen van volledig elektrische personenwagens

This presentation discusses the characteristics of battery electric vehicles. Plug-to-wheel efficiency, battery mass, charging, range (constant speed and driving cycle) and performance are discussed. Presentation is in Dutch