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Impact of Vehicle Electrification on Brake Design

Maruti Suzuki India, Ltd.-Vipul Gupta
  • Technical Paper
  • 2019-28-2499
To be published on 2019-11-21 by SAE International in United States
Electric vehicles have come full circle from being primary vehicle type in 19th century (much before IC powered vehicles) to 21st century where major stake holders in mobility have announced plans towards vehicle electrification. Apart from battery & powertrain system, braking system is area which will undergo major changes because of vehicle electrification. But Why? Major keywords are regenerative braking, increased vehicle weight, no or insufficient vacuum from engine and silent powertrains. This paper tries to outline potential impact on hydraulic brake system & its component design for M1 and N1 category of four wheelers with advent of vehicle electrification. Needless to say extent of change will vary depending upon extent of electrification and extent of recuperation during regenerative braking. Extent of electrification depends upon whether vehicle is range extender type hybrid vehicle, plug in hybrid vehicle, battery electric vehicle, fuel cell vehicle etc. Extent of electrification defines in turn extent of recuperation possible, extent of increase in vehicle weight, availability of vacuum and NVH of powertrains. Extent of recuperation is constrained by motor generator…
 

Combi Brake System (CBS) design and tuning on an electric two wheeler for cornering maneuver

Ather Energy-Lokesh Soni, Shivaram Venkateswaran
Xitadel CAE Technologies Pvt Ltd-Dhanraj Domala
  • Technical Paper
  • 2019-28-2399
To be published on 2019-11-21 by SAE International in United States
To reduce the number of traffic accidents, most of the governments have mandated to include Combi Brake System (CBS) or Anti-lock Braking System (ABS) in two wheelers. While most of the homologation requirements for CBS can be fulfilled by straight line motion, CBS behavior is crucial while cornering for safety aspects. When vehicle is in cornering motion, the lateral forces generated at the tire decreases the effective longitudinal force available, which implies lesser braking force at tire. This paper represents a design methodology for tuning CBS for various critical scenarios mainly during cornering maneuver. A detailed study has been made at various combination of vehicle lean angle, vehicle speed and friction coefficient of road in straight line and cornering maneuver to effectively decide on front to rear brake force distribution to avoid either of the tires’ lock-up. A co-simulation is done with BikeSim and Simulink softwares, where vehicle model is developed in BikeSim and CBS control algorithm in Simulink. Both the models are correlated against real test data. Keywords: Combi Brake System (CBS), wheel slip…
 

A new appraisal of the thermomechanical behaviour of a hybrid composite brake disc in a formula vehicle

FORCE MOTORS, Pune , India.-Pradeep C
Sri Krishna College of Engg and Tech-Soundararajan R, Sathish Kumar K, Shanthosh G
  • Technical Paper
  • 2019-28-2572
To be published on 2019-11-21 by SAE International in United States
A new appraisal of the thermomechanical behaviour of a hybrid composite brake disc in a formula vehicle Research Objective This paper presents a hybrid composite brake disc with reduced Un Sprung Weight clearing thermal and structural analysis in a formula vehicle.Main purpose of this study is to analyse thermomechanical behaviour of composite brake disc for a formula vehicle under severe braking conditions. Methodology In the disk brake system, the disc is a major part of a device used for slowing or stopping the rotation of a wheel. Repetitive braking of the vehicle leads to heat generation during each braking condition. Based on the practical understanding the brake disc was remodelled with unique slotting patterns and grooves, using the selected aluminium alloy of (AA8081) with reinforcement particle of Silicon carbide (SiC) and Graphite (Gr) as a hybrid composite material for this proposed work. In First Phase of this Project work, By varying slotting pattern and groove angles the transient thermal and structural analysis using ANSYS workbench ,the hybrid composite disc plate of disk brake is done.The…
 

ELECTRIC BICYCLE WITH REGENERATIVE BRAKING SYSTEM

IIT Mandi-aman soni, anshul mehrotra, Ankit Joshi, Arpan Gupta, narsa Tummuru
  • Technical Paper
  • 2019-28-2490
To be published on 2019-11-21 by SAE International in United States
One of the significant challenges in the present scenario is the depletion of fossil fuels. As the use of conventional fuel is increasing day by day, it will lead to the complete depletion of fossil fuel in the future. So, an alternate solution to this problem is the use of electric vehicles which is independent of the dependence on fossil fuels. Electric vehicles (EVs) use batteries to power them and are electric motor driven. One advantage of using these electric vehicles is that they are pollution free and smokeless. One of the critical limitations of these electric vehicles is the low driving range per charge. The main proposal of this paper is the implementation of a regenerative braking system (RBS) which helps in recovering the kinetic energy that gets wasted during braking. RBS will be very useful in hilly terrain areas where much potential energy can get recovered while moving down the hill. This potential energy while going downhill is mostly wasted in brakes to regulate the speed of the vehicle. The present paper demonstrates…
 

Characteristics of a Brake Disc’s Nonuniform Thermomechanical Responses to an Emergency Braking

Winhere Auto Parts Mfg Co.-Qianjin Yang, Fulin Gai, Liqiang Song, Hui Yu, Baozhi Zhang
  • Technical Paper
  • 2019-01-2118
To be published on 2019-09-15 by SAE International in United States
Brake discs in service are subjected to the combined thermal and mechanical loadings. Due to the complex interactions of different parts in operating brake systems and various thermal and mechanical boundary conditions, the thermomechanical responses of brake discs are highly nonuniformly distributed across the brake discs. In this paper, a detailed finite element analysis model was developed to understand the thermomechanical responses of a solid brake disc to an emergency braking. The temperature and the stress in the brake disc were then characterized thoroughly in the radial, circumferential and thickness direction of the disc, and it was found that they were all nonuniformly distributed in the three directions. Furthermore, the stress responses of the disc due to the combined thermal and mechanical loadings were separated into thermal stress and mechanical stress, and their particular characteristics to the individual thermal or mechanical loading were identified. That is: the amplitude of the total stress in the disc was predominately determined by the thermal loading; however the high cycle fluctuations were mainly due to the mechanical loading. All…
 

The Influence of Differential Pad Wear on Low-Frequency and High-Frequency Brake Squeal

SKR Consulting Inc.-Seong K. Rhee
Technische Universitat Braunschweig-Johannes Otto, Georg-Peter Ostermeyer
  • Technical Paper
  • 2019-01-2130
To be published on 2019-09-15 by SAE International in United States
The NVH behavior of disc brakes in particular, is in the focus of research since a long time. Measurements at a chassis dynamometer show that brake pad wear has a significant influence on the occurrence of low- and high-frequency squealing [1]. It is suspected that high-frequency squealing is more likely to occur when the wear difference between the inner and outer brake pad is small. In the other case, if the differential wear rate between the inner and outer pads becomes higher, the prevalence of low-frequency squealing increases.In order to examine this hypothesis, this work focuses on a simplified model of a commercial brake system [2]. In a first step, the inner pad’s wear is iteratively increased, while the wear on the outer pad remains unaffected. In a second step, the coefficient of friction at the worn pad is iteratively increased to investigate the influence on the low and high-frequency squealing. With the aid of the Complex Eigenvalue Analysis (CEA), the real part of the eigenvalue is used as a quantification measure in order to…
 

Stability of Wheel Tractors during Braking

Kharkiv Technical University of Agricult-Zadorozhnia Viktoriia
Kharkov National Auto and Highway University-Mikhail Podrigalo, Mykhailo Kholodov, Dmytro Klets, Yevhen Dubinin, Borys Savchenkov, Alexander Koryak, Oleksandr Polianskyi
  • Technical Paper
  • 2019-01-2142
To be published on 2019-09-15 by SAE International in United States
The dynamic distribution of normal reactions between the axles of the wheeled tractor has a significant impact on the stability against skidding and the wheeled tractor braking effectiveness. At the same time, the clarification of the normal reactions distribution between the axles allows to choose more rational braking forces distribution between the axles.It is shown that the best way to ensure the highest braking efficiency is the braking mode when the rear wheels of the tractor are at the blocking limit. An assessment of the expediency of installing brake mechanisms on only one axle of the tractor was made.The increase of braking efficiency of wheeled tractors with all brake wheels provided that they ensure directional stability is considered. The laws of braking forces distribution between the axles of wheel tractors for different sequence of wheels locking are determined.Using the method of partial accelerations an improved method for estimating the effect of a brake system on the stability of wheeled tractor is proposed. The criterion in the form of angular acceleration in the road plane ώz,…
 

Squeal Noise Improvement by High Damping & High Stiffness Under Layer Material

ADVICS Co., Ltd.-Shusuke Suzuki
ADVICS North America, Inc.-Masato Nishioka, Leanne Johnson, Sean Rosalez
  • Technical Paper
  • 2019-01-2111
To be published on 2019-09-15 by SAE International in United States
The purpose of this research is to clarify how damping characteristics of Under Layer (UL) material in the PAD influences brake squeal noise performance. In this study, UL material structure and dynamic viscoelasticity, for two different types of UL formulations are investigated. In addition, PAD damping ratio and squeal noise performance for multiple UL formulations are verified. The raw material orientation is determined based on manufacturing method, and it causes the UL material’s anisotropic properties. Dynamic viscoelasticity are dependent on the direction in which they are measured. In particular, the loss modulus, which is the damping element of dynamic viscoelasticity, is higher in the direction of the raw material orientation for the high damping and high stiffness UL formulation. In addition, it was confirmed that this loss modulus in the direction of the raw material orientation is effective for bending vibration. Based on the investigation results, the verification portion of the study focuses on the PAD damping ratio and squeal noise performance in the 1st bending vibration of the PAD. PADs with the same compressibility…
 

Frequency Inspection of Brake System Components

Signalysis Inc.-Robert Cagle
  • Technical Paper
  • 2019-01-2117
To be published on 2019-09-15 by SAE International in United States
Frequency inspection has long been a tool utilized by manufacturers of brake system components as a means of quality control. This is important to combat perceived defectiveness of a system that experiences issues, such as brake squeal, as well as to identify actual defects in the parts going out to customers. Every component has its own resonance frequencies based on the dynamics of that component. Knowledge of the resonance frequencies of each component provides insight that can prevent manufacturers from sending out defective units, whether they be perceived defects or actual defects. NVH engineers who understand these phenomena perform theoretical analysis and acquire experimental data in the lab to gain insight into their parts that will eventually be produced on the assembly line. Unfortunately, the frequency requirements, and the consequences thereof, defined by the NVH engineers can still remain somewhat of a mystery to the manufacturing engineers who are tasked with applying them. Oversights in specifications can lead to avoidable scares that lead to delays and downtime. For example, differences in accelerometer placement on a…
 

Development of Regenerative Brake Control Strategy to Remove Brake

Hyundai & Kia Corp-Sora Jang, Gwichul Kim
  • Technical Paper
  • 2019-01-2125
To be published on 2019-09-15 by SAE International in United States
This study is the development concept of regenerative braking cooperative control to reduce creep groan noise considering fuel efficiency. Creep groan noise is a traditional brake system noise that has been improved with advances in technology such as brake materials, surface treatment and transfer path. However, recently creep groan noise is again an issue in electronic vehicle which applied a drive motor. Generally, creep groan noise frequently occurs when rust occurs on the friction surface of the brake disc and the brake pad is humidified, but it is easily removed by friction braking several times. However, in the case of electric vehicles which applied regenerative braking system, it is hard to remove. In case of electric vehicle, instead of friction braking, most of brake toques are made by motor regenerative braking. Therefore, even if the same conventional brake system and chassis system are applied, the noise level of the electric vehicle is higher than gasoline or diesel vehicle, and the field claim is also higher. To improve the noise, regenerative braking cooperative control logic was…