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Vehicle accelerator and brake pedal on-off state judgment by using speed recognition

Suizhou-WUT Industry Research Institute-Gangfeng Tan
Wuhan University of Technology-Zhongpeng Tian, Bo Yang, Cong linpeng, Fangyu Zhou
  • Technical Paper
  • 2020-01-1377
To be published on 2020-04-14 by SAE International in United States
The development of intelligent transportation improves road efficiency, reduces automobile energy consumption and improves driving safety. The core of intelligent transportation is the two-way information interaction between vehicles and road environment. At present, mainly the road environment information transmits to vehicles, while the information of vehicles rarely transmits to the outside. The electronic throttle and electronic braking systems of some vehicles using sensors to get the state of the accelerator and brake pedal, which can be transmitted to the outside through technologies such as the Internet of vehicles. But, Internet of vehicles technology has not been widely used, and it relies on signal sources, which is a passive way of information acquisition. In this paper, an active identification method is proposed to get vehicle pedal on-off state also driver operation behavior through existing traffic facilities. The research object is commercial vehicles driving on expressways. Vehicle speed is acquired by the camera, and specific vehicle models are identified by the camera to get the relevant vehicle parameters from vehicle model database. Combined with road environment data,…
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Simulation of the Combined Braking Control System for Hybrid Electric Vehicles

Kharkiv National Automobile and Highway University-Serhii Shuklynov, Mykhailo Kholodov, Leonid Ryzhykh
VN Karazin Kharkiv National University-Victor Verbitskiy
  • Technical Paper
  • 2020-01-0217
To be published on 2020-04-14 by SAE International in United States
Simulation model of the combined braking control system for hybrid electric vehicles is proposed. The model shows working processes of the braking system with actuating friction mechanisms and an electro-hydraulic drive and regenerative braking system with an electrodynamic mechanism. The electrodynamic mechanism of regenerative braking is formed by switching the traction motor to the generator operating mode. At the same time braking effect is transmitted through the transmission to the drive wheels. The combined control of two brake systems of an electric vehicle is carried out by the driver when acting on one common control element - the brake pedal. Pushing on the braking pedal, driver generates the given control signal- desirable level of electric vehicle deceleration. In accordance with the given control signal, the law of control can be selected in the simulation model - the control function (electric vehicle deceleration) is proportional to the pedal effort or the control function is proportional to the set value of deceleration. In this case, the control system is adaptive and corrects the control signal in accordance…
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Driver response to right turning path intrusions at signal-controlled intersections

Kodsi Engineering-Shady Attalla, Sam Kodsi
University of Guelph-Erika Ziraldo, Michele Oliver
  • Technical Paper
  • 2020-01-0884
To be published on 2020-04-14 by SAE International in United States
Previously researched path intrusion scenarios include left turning hazard vehicles which intrude laterally across the path of the through driver. A right turning vehicle, however, creates a scenario where a hazard which was initially traveling perpendicular to the driver can intrude into the through driver's path without also occupying the adjacent through lanes. This hazard scenario has not been previously investigated. The purpose of this research was to determine driver response time (DRT) and response choice to a right turning vehicle that merges abruptly into the lane of the oncoming through driver. A study was conducted using an Oktal full car driving simulator. 107 licenced drivers (NFemale=57, NMale=50) completed a short practice drive followed by an experimental drive containing two conditions of the right turn hazard, presented in a counterbalanced order. In one condition, the hazard vehicle was stopped at the stop bar before accelerating into the path of the participant driver. In the other condition, the hazard vehicle approached the intersection and turned at a constant speed. DRT was defined as the time between…
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Driver response to left incurring path intrusions at sign-controlled intersections

Kodsi Engineering-Shady Attalla, Sam Kodsi
University of Guelph-Erika Ziraldo, Michele Oliver
  • Technical Paper
  • 2020-01-0886
To be published on 2020-04-14 by SAE International in United States
Straight intersecting path or “side” collisions account for 12% of all motor vehicle crashes and 24% of fatalities. While previous research has examined driver responses to hazards striking from the right (near side), no research has quantified driver responses to hazards striking from the left (far side) of an intersection. The purpose of this study was to measure driver response time (DRT) and response choice for two versions of this scenario. In one condition, the hazard vehicle was initially stopped at the intersection before accelerating into the path of the participant driver. In the other condition, the hazard vehicle approached and entered the intersection while moving at a constant speed of 50km/h. Testing was conducted using an Oktal full car driving simulator. 107 licenced drivers (NFemale=57, NMale=50) completed a short familiarization drive followed by the experimental drive in which they encountered both the initially stopped and moving conditions of the straight path hazard, in a counterbalanced order. DRT was defined as the time between when the hazard vehicle crossed a trigger located two meters from…
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Research on Compensation Redundancy Control for Basic Force Boosting Failure of Electro-Booster Brake System

Jilin University-Jian Zhao, Zhicheng Chen, Bing Zhu, Jian Wu
  • Technical Paper
  • 2020-01-0216
To be published on 2020-04-14 by SAE International in United States
As a new brake-by-wire solution, the electro-booster (Ebooster) brake system can work with the electronic stability program (ESP) equipped in the real vehicle to realize various excellent functions such as basic force boosting (BFB), active braking and energy recovery, which is promoting the development of smart vehicles. Among them, the BFB is the function of Ebooster's servo force to assist the driver's brake pedal force establishing high-intensity braking pressure. After the BFB function failure of the Ebooster, it was not possible to provide sufficient brake pressure for the driver's normal braking, and eventually led to traffic accidents. In this paper, a compensation redundancy control strategy based on ESP is proposed for the BFB failure of the self-designed Ebooster. Firstly, introduced the working principle of Ebooster and ESP, and a suitable pressure-building circuit was selected for the dual brake actuator system; Secondly, after the BFB failure of Ebooster, the rule-based strategy of braking awareness recognition was designed. Thirdly, a layered closed-loop compensation control strategy is designed based on the ESP to restore the pressure building capacity…
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Development of Advanced Idle Stop-and-Go Control Utilizing V2I

Hyundai-Kia America Technical Center Inc.-Jason Hoon Lee, Yong Sun, Josiah Humphrey, Jinho Ha, Byungho Lee
  • Technical Paper
  • 2020-01-0581
To be published on 2020-04-14 by SAE International in United States
Previous studies proposed the utilization of Advanced Driver Assistance System (ADAS) for introducing adaptiveness to powertrain control with respect to traffic situation change. When vehicle stops with the engine shut off by Auto Stop/Start function, the controller keeps watching the movement of preceding vehicle using ADAS sensors. Then it restarts the engine automatically as soon as it detects the launch of the vehicle ahead, before the driver releases brake pedal. The control logic also can inhibit Auto Stop/Start under specific driving conditions, for example, stopping for a stop sign or waiting at a roundabout by utilizing the traffic sign recognition function of vision sensor. In the prior studies it was demonstrated through actual vehicle tests that the new control method can improve the Auto Stop/Start performance, thereby mitigating customer complaints regarding the hesitation in engine restart and promoting the usage. However, the previously suggested method based on movement detection becomes useless if there was no target vehicle ahead to follow. The issue arises when the vehicle happens to be the first vehicle from traffic light…
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Characterizing Regenerative Coast-Down Deceleration in Tesla Model 3, S and X

Momentum Engineering Corp.-Omair Siddiqui, Daniel Simacek, Ryan Hoang, Nicholas Famiglietti, Benjamin Nguyen, Jon Landerville
  • Technical Paper
  • 2020-01-0883
To be published on 2020-04-14 by SAE International in United States
Tesla Motors utilizes a regenerative braking system to increase mileage per charge. The system is designed to convert the vehicles’ kinetic energy during coast down into potential energy by using rotational wheel motion to charge the batteries, resulting in moderate deceleration. During this coast down, the system will activate the brake lights to notify following vehicles of deceleration. In October 2018 Tesla Motors pushed software update 2018.42v9 which increased the regenerative braking force of the Model 3. Previous studies have tabulated regenerative braking performance for Model 3’s but have not addressed recent software changes nor brake light behavior related to regenerative braking. The goal of this paper is to quantify the regenerative braking behavior of Tesla Model 3, S, and X, as well as the timing and activation criteria for the brake lights under a regen/coast-down state. Various Model 3, S, and X of different trim levels (differing by battery size and number of driven wheels) were studied by accelerating to various speeds then coasting down while measuring deceleration rates, brake pedal position, accelerator pedal…
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Contiguous Aircraft/System Development Process Example

S-18 Aircraft and Sys Dev and Safety Assessment Committee
  • Aerospace Standard
  • AIR6110
  • Current
Published 2020-02-05 by SAE International in United States
This AIR provides a detailed example of the aircraft and systems development for a function of a hypothetical S18 aircraft. In order to present a clear picture, an aircraft function was broken down into a single system. A function was chosen which had sufficient complexity to allow use of all the methodologies, yet was simple enough to present a clear picture of the flow through the process. This function/system was analyzed using the methods and tools described in ARP4754A/ED-79A. The aircraft level function is “Decelerate Aircraft On Ground” and the system is the braking system. The interaction of the braking system functions with the aircraft are identified with the relative importance based on implied aircraft interactions and system availabilities at the aircraft level. This example does not include validation and verification of the aircraft level hazards and interactions with the braking system. However, the principles used at the braking system level can be applied at the higher aircraft level. The methodologies applied here are an example of one way to utilize the principles defined in…
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Brake Pedal felling correlation with female shoe and feet position

(General Motors do Brasil)-Giorgia Buganza, Fernando Utyike, Fabio Raposo, Eduardo Godinho
  • Technical Paper
  • 2019-36-0015
Published 2020-01-13 by SAE International in United States
The female market share has increase every year, for some segments we have a majority of female buyers. Working with this tendency we work to understand the impact and the dislikes that we may be facing in the near future due to the costumer habits, and also understand what can be done to improve this relationship.This paper will discuss the feeling correlation between the foot position, heel point, drivers knee and the feeling of the brake pedal.We need to consider the difference between different shoe sole design and the impact on the point of force apply and angles resulting a costumer perception of the brake feeling of the vehicle.Based on Market research, math model studies and simulation, experiments done at the vehicle and measurements considering different situations we will show that the felling can be affected using different shoes and the brake performance perception can be also affected.We conclude the paper with the comments on what should be consider guaranteeing the best driver experience feeling.
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More than a brake

Robert Bosch Ltda – Chassis Systems Control Unit-Emerson Batagini
  • Technical Paper
  • 2019-36-0020
Published 2020-01-13 by SAE International in United States
The automotive world is battling every day to provide innovation and product development without compromising the environment. The electrification of the engines can be a factor that divides eras into the market. The conventional brake system links the act of apply the brake pedal with the stop or deceleration of the vehicle. This is now possible thanks to the long-term use of the vacuum generated by the combustion engine or by auxiliary equipment (vacuum pump). New brake system technologies provides, without a vacuum source, more efficient and safer braking than the current power brake system. Embedded in technological developments, these systems interacts with other vehicle components (cameras, radars, ABS, ESC) bringing the driver advanced safety conditions.
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