Development of a systematic process for hydraulic brake system design and for hot judder characteristic estimation

Chung, Won Sun; Song, Hyun Seok; Jung, Do Hyun; Park, Tae Won

doi:10.1007/s12206-012-0887-4

Cited by 12 publications

(4 citation statements)

References 7 publications

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“…In automobiles, technologies such as advanced safety devices and convenience devices are continuously being developed, and in particular, technology development in the field of passenger and pedestrian safety greatly contributes to the reduction of traffic accidents [1][2][3][4][5][6]. As a result, electric vehicles are attracting a lot of attention because of their higher efficiency, lower emissions, and various safety device features compared to internal combustion engine vehicles [7][8][9][10][11][12][13]. When the driver brakes or turns the vehicle in a direction different from the command, ESC detects this from sensors installed in the braking and steering system to functionally compensate for anti-locking brake system (ABS) and brakes each wheel independently.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Manufacture of Permanent Magnet Traction Control Valve for Electronic Stability Control in Electric Vehicles

Lee¹,

Park²,

Hong

et al. 2021

Applied Sciences

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Most solenoid valves in use today require a magnetic coil to be continuously energized to maintain the magnetization of the magnetic body in order to operate. The problem is that if the power is still supplied, the power consumption will continue. In addition, problems such as shortening the lifespan of solenoid valve internal parts due to the increase in the internal temperature of the electronic stability control (ESC) due to the continuous heating of the magnetic coil, and malfunction due to instantaneous power failure may occur. In this study, we conducted a study on the permanent magnet traction control valve (TCV) for ESC that can minimize the unnecessary power consumption of electric vehicle batteries. For optimal permanent magnet design, polarity direction setting and permanent magnet specifications were studied through FE simulation. A permanent magnet TCV was fabricated and an electromagnetic force test was conducted to compare and evaluate it with the FE simulation result. By using a permanent magnet, it was possible to lower the initial current value for the TCV to drive, therefore, it was possible to develop a permanent magnet TCV that can minimize the unnecessary power consumption of electric vehicle batteries.

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Section: Introductionmentioning

confidence: 99%

A Study on the Manufacture of Permanent Magnet Traction Control Valve for Electronic Stability Control in Electric Vehicles

Lee¹,

Park²,

Hong

et al. 2021

Applied Sciences

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“…The transient fluctuations are considered as hot judder. 8,9 The hot judder phenomenon in clutches and brakes has been extensively explored. The finite element method was used to find the sensitive parameters of the brake judder.…”

Section: Introductionmentioning

confidence: 99%

Influences of the uneven contact pressure and the initial temperature on the hot judder behavior in a multi-disc clutch

Kim

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents an investigation of the hot judder behavior in a multi-disc clutch with the uneven contact pressure and the initial temperature taken into account. Considering the actual structure of clutch, the pressure function is achieved to describe the uneven contact pressure distribution due to the circlip constraint. Moreover, the pin-on-disc test is conducted to obtain the formula of the coefficient of friction with the contact pressure, surface temperature, and rotating speed involved. The thermal and dynamic models are established and coupled to evaluate the hot judder behavior. The results demonstrate that the uneven contact pressure has a slight influence on the clutch hot judder, but it expands the radial temperature difference on the friction surface; meanwhile, the friction torque generated on the friction surface closer to the circlip is larger. Although the increase of initial temperature can shorten the clutch engagement time, the clutch hot judder will be shriller, as verified in the SAE#2 bench test. Furthermore, in order to reduce the clutch hot judder, the circlip should be optimized to smooth the radial contact pressure, and the advanced thermal management method should be applied to strengthen the clutch heat dissipation.

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“…The former may lead to uneven thermal distortion of the plates, 2 while the latter is a friction-induced and low-frequency dynamic instability. Eventually, they result in unstable frictional contact, and moreover, the vibration under such conditions is called hot judder, 3 which reduces the quality of clutch engagement and causes clutch failure.…”

Section: Introductionmentioning

confidence: 99%

Hot judder behavior in multidisc clutches

Yang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents an investigation of the hot judder phenomenon of multidisc clutches, which takes place during the engagement process. Depending on the results of finite element analysis, a pressure distribution function is defined and a contact pressure equation is established to demonstrate the non-uniformity of the contact pressure distribution on the friction interfaces due to frictional heat. The relationship between the coefficient of friction and the temperature is analyzed. A 4 degrees of freedom power-train model is developed to evaluate the clutch judder behavior. The paper indicates that the clutch judder is influenced by the non-uniformity of the interface contact pressure distribution, which is excited by frictionally induced thermal load. The non-uniform contact pressure distributions along the radial direction have a slight influence on the clutch judder, while the uneven contact pressure distributions along the circumference contribute to the judder substantially. Furthermore, the results in this work can be used to study the operation instability and the thermal failure of clutches.

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Development of a systematic process for hydraulic brake system design and for hot judder characteristic estimation

Cited by 12 publications

References 7 publications

A Study on the Manufacture of Permanent Magnet Traction Control Valve for Electronic Stability Control in Electric Vehicles

A Study on the Manufacture of Permanent Magnet Traction Control Valve for Electronic Stability Control in Electric Vehicles

Influences of the uneven contact pressure and the initial temperature on the hot judder behavior in a multi-disc clutch

Hot judder behavior in multidisc clutches

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