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Dynamics of Amphibious All-terrain Vehicle’s Chassis Having Vibration Energy Harvesting Dampers

Mega Automation inc-Dmytriy Gurevych
Nermar, Ltd.-George Nerubenko
  • Technical Paper
  • 2019-01-1510
To be published on 2019-06-05 by SAE International in United States
The rural off-road exploiting of amphibious all-terrain vehicles leads to intensive vibrations of all parts of a vehicle, and specifically of its chassis. The tested amphibian vehicle’s chassis has the lowest natural frequency of 19.34 Hz. Vibration Energy Harvesting Damper (VEHD) is used for mitigation of chassis vibrations. VEHD provides mutually interconnected results: reduction of undesired vibration levels and generating of the additional electrical power. Newly patented VEHD consists of two main components: Tuned Mass Damper and Generator of Electricity. The perspective feature of proposed VEHD is the ability of effective vibration damping in broad range of frequencies due to implementation of a control device, while that device is keeping automatically the changing natural frequency of VEHD equals to current frequency of external force. The mathematical simulation analysis based on parameters of the amphibious all-terrain vehicle chassis is developed. The experiments arranged on recently designed amphibious all-terrain vehicle illustrate the compliance with theoretical predictions, and efficiency of proposed VEHD operating mainly in low frequency interval. The analysis of dynamical performance of developed VEHD demonstrates applicability…
 

A Control Strategy to Reduce Torque Oscillation of the Electric Power Steering System

Duo Fu
Concordia University Montreal-Subhash Rakheja
  • Technical Paper
  • 2019-01-1516
To be published on 2019-06-05 by SAE International in United States
This paper proposes a new method of analyzing stability and design of a controller for an electric power steering (EPS) system. The main purpose of an EPS control design is to ensure that the driver will have a comfortable drivering experience, which is mostly depend on the assist torque map. However, the high level of assist gain will lead to vibration or even divergence of the steering system. Therefore, an EPS system needs to have an extra stability compensator to stabilize the system and attenuate the unpleasant vibration. In this paper, an accurate theoretical model is built and the criteria for evaluation of system quality are suggested. The bench tests and vehicle experiments are performed to verify the theoretical analysis.
 

Robust NVH Engineering using Experimental Methods – Source Characterization Techniques for Component Transfer Path Analysis and Virtual Acoustic Prototyping

Robert Bosch Automotive Steering LLC-Kevin Wienen, Michael Sturm
University of Salford-Andy Moorhouse, Joshua Meggitt
  • Technical Paper
  • 2019-01-1542
To be published on 2019-06-05 by SAE International in United States
A major challenge in automotive NVH engineering is to approach complex structure-borne sound and vibration problems with sufficient accuracy but reasonable experimental effort. Typical issues encountered are poor correlation between objective component performance criteria tested for during bench validation and corresponding subjective targets evaluated during system validation in the actual vehicle. Additional challenges arise from the need to impose assumptions on sophisticated physical vibration problems to reduce the complexity to a level feasible for conventional experimental test methods. This paper addresses all mentioned issues by elaborating on a system NVH engineering approach employing Virtual Acoustic Prototyping (VAP) (related to what is now often called component Transfer Path Analysis) to synthesize time domain sound and vibration responses of vibrating machinery operated in a virtual vehicle environment. One crucial step of VAP is to characterize the strength of vibrating machinery by independent quantities at the significant coupling degrees of freedom (DoF). This study puts special focus on the measurement of free velocity, suitable for machinery operated when resiliently mounted as per ISO 9611, and the in-situ measurement…
 

Optimization and Evaluation of 12V/48V Architectures based on EDS Simulation and real Drive Cycles

University of Kassel-Ludwig Brabetz, Mohamed Ayeb, Daniel Sebastiao
  • Technical Paper
  • 2019-01-0482
To be published on 2019-04-02 by SAE International in United States
Both the rising number of electrical systems and the electrical part of the powertrain is considerably increasing the electrical power requirements of vehicles. As a consequence, multiple voltage supply levels have been introduced. However, even if only the 12V/48V configuration is considered, as in this paper, the number of possible electrical distribution system (EDS) architectures is strongly enlarged. Additional degrees of freedom are the allocation of the loads to the voltage levels, the dimensioning of new components, and the control strategy. Hence, the optimization of such architectures must be based on simulation, which allows the evaluation of a multitude of variants and test scenarios within an acceptable time frame. While strict cost, weight, and quality constraints must be upheld, the stability of the voltage supply is a major focus because a significant part of future electrical systems is highly safety-critical. In this paper, quantitative quality criteria for the evaluation of the voltage stability are applied which enable a systematic assessment of the performance of an EDS. The presented approach is based on a modular simulation…
 

A Drive-by-Wire Conversion of an FMVSS-500 Vehicle for Autonomous Driving Applications

University of Detroit- Mercy-Viken Yeranosian, Nayan Patel, Joseph Vega, Utayba Mohammad, Mark Paulik, Michael Santora
  • Technical Paper
  • 2019-01-0704
To be published on 2019-04-02 by SAE International in United States
Autonomous driving has witnessed many developments in the past decade. Most automotive manufacturers and technology companies have been investing in the software and platform development of these vehicles and long strides have been made in this domain. Nonetheless, academia has been partially isolated from the practical efforts of these developments, due to the cost involved in converting a standard vehicle into a drive-by-wire platform suitable for self- driving vehicular research. In this paper, a low-cost autonomous vehicle platform is developed and the process for converting a Gem Polaris e2 FMVSS-500 vehicle to brake-by-wire, throttle-by-wire, and steer-by-wire is elaborated. The tools and the procedures followed here were all conducted by students, in house, and can be easily duplicated for other FMVSS-500 compatible vehicles. Discussions include the interface of an embedded controller for an electric power steering system, electronic control of hydraulic brake pressure, and modulation of vehicle velocity and acceleration. Complete system operation via remote control is demonstrated.
 

Analysis and Research on Vibration Characteristics of Reclaiming Energy Suspension Based on Adjustable Load

Chongqing University-Zheng Ling, Wu Hang
  • Technical Paper
  • 2019-01-0453
To be published on 2019-04-02 by SAE International in United States
Wheel-side drive electric vehicle is electric vehicle that uses wheel motor to drive wheel directly. Because of the introduction of the hub motor, the quality of the vehicle's non-spring load increases obviously, not only affects the ride comfort, but also reduces the driving safety. Active suspension can significantly improve overall vehicle performance, but high energy consumption has been one of the main factors restricting its promotion in the market. The use of an electromagnetic linear motor as the actuator of the active suspension provides an opportunity for this contradictory solution. Using the principle of electromagnetic induction, the linear motor can transform the vibration energy of the vehicle into the electricity that can be directly used by the vehicle, and realize the purpose of improving the vehicle performance while reducing the energy consumption. In order to realize that purpose, a dynamic model of vehicle vertical 7-DOF active suspension is established in this paper. Based on optimal control theory, a load adjustable reclaiming energy suspension controller is designed. The relevant parameters of suspension are optimized by particle…
 

Assessment through Numerical Simulation of the Impact of a 48 V Electric Supercharger on Performance and CO2 Emissions of a Gasoline Passenger Car

Politecnico di Torino-Alessandro Zanelli, Federico Millo
Röchling Automotive-Marco Barbolini, Luca Neri
  • Technical Paper
  • 2019-01-1284
To be published on 2019-04-02 by SAE International in United States
The demanding CO2 emission targets are fostering the development of downsized, turbocharged and electrified engines. In this context, the need for high boost level at low engine speed requires the exploration of dual stage boosting systems. At the same time, the increased electrification level of the vehicles enables the usage of electrified boosting systems aiming to exploit the opportunities of high levels of electric power and energy available on-board. The aim of this work is therefore to evaluate, through numerical simulation, the impact of a 48 V electric supercharger (eSC) on vehicle performance and fuel consumption over different transients. The virtual test rig employed for the analysis integrates a 1D CFD fast running engine model representative of a 1.5 L state-of-the-art gasoline engine featuring an eSC in series with the main turbocharger, a dual voltage electric network (12 V + 48 V), a six-speed manual transmission and a vehicle representative of a B-SUV segment car. The evaluation tests chosen for the case study were, on the one hand, vehicle elasticity manoeuvres for the performance assessment…
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The Review of Present and Future Energy Structure in China

Tsinghua University-Feiqi Liu, Fuquan Zhao, Han Hao, Zongwei Liu
  • Technical Paper
  • 2019-01-0612
To be published on 2019-04-02 by SAE International in United States
Both the economy and energy demand increase rapidly in China. The government is facing severe problems from energy security, carbon emissions and environmental issues. The past trends and future plans of energy will have great influence on the transportation, construction and industry development. This paper summarizes the present and future energy structure in China. Conventional fossil energy, nuclear energy and renewable energy are all included. Electricity will account for more proportion in total energy consumption in the future, and the structure of electricity will be cleaner. That will promote the development of electric vehicles and the transformation of China’s automotive industry. The optimization of energy structure will accelerate the low-carbon development in China. China’s energy development will enter a new stage from the expansion of total quantity to the upgrading of quality and efficiency. In order to realize the Paris Climate Agreement, China must steadily control the total energy consumption. The energy consumption in China will be in a period of slow growth. Constantly optimizing the energy structure and promoting renewable energy will both ease…
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A Development of the Model Based Torque Feedback Control with Disturbance Observer for Electric Power Steering System

Hyundai Motor Company-Deukpyo Lee, Yun Gab Lo, Minwoo Han, Kyuwon Kim, Chulhee Kim
  • Technical Paper
  • 2019-01-1233
To be published on 2019-04-02 by SAE International in United States
Electric Power Steering (EPS) needs to meet both functional and stability requirements, it plays significant role in controlling vehicle motion. In the meantime, customers emphasizes natural steering feel which can reflect vehicle motion and road surface information while isolate unwanted external disturbances. In general, conventional EPS control algorithms exert assist torque according to driver torque measured from torque sensor, while maintaining stability using stabilizing compensator. However, there exist significant trade-off between steering feel and stability, because the performances of assist torque control and stabilizing compensator are strongly coupled. In this paper a torque feedback control algorithm for EPS system is proposed in order to overcome the trade-off, and to achieve more natural, robust steering feel. The torque feedback algorithm consists of two main components; target torque generator, target torque following controller which can decouple steering feel and stability control performances. Target torque generator defines desired driver torque based on estimated road reaction torque; the road reaction torque estimation is carried out using EPS system dynamics model. Target torque following controller based on lead-lag compensator controls…
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Development of the Wireless Power Transfer Technology for a Sliding Door

Hyundai Motor Co.-MyoungKwon Je, Jae Kyu Lee, Jae Hong Choi, Hyung In Yun, KeunSoo Kim
  • Technical Paper
  • 2019-01-0485
To be published on 2019-04-02 by SAE International in United States
The sliding door’s movement is 3-dimensional unlike the conventional door. So the electric power and signal are exchanged via the long ‘Power Cable’. It has a quite complex structure in order to be suitable to connect the vehicle’s body and the sliding door even during it’s moving. As the result, it is more expensive than conventional door’s one and the quality could not be guaranteed easily. In this paper, I have developed new technology which could transfer electric power by ‘wireless transfer’ in order to resolve the problem from using ‘Power cable’. I would propose the proper structure to transfer the electric power at any position of the sliding door without any physical connection. To transfer the electric power which drives the window regulator and the actuators in door, I have applied the ‘inductive coupling’ system. And in order to decide the engineering properties - such as the dimensions of the core, the values of the electric elements and the frequency of the transferred electricity - a myriad of computer analysis and experiments under various…
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