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L. D. Kandt

Bio: L. D. Kandt is an academic researcher from University of Washington. The author has contributed to research in topics: Air brake & Brake. The author has an hindex of 1, co-authored 1 publications receiving 23 citations.
Topics: Air brake, Brake

Papers
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Journal ArticleDOI
01 Jan 2001
TL;DR: A mathematical model of an air brake chamber is developed and used to investigate parameter sensitivity and a method capable of indirectly determining brake stroke by examining air pressure data is formulated and its effectiveness is proven through simulation and testing.
Abstract: Continuing research in brake condition monitoring for vehicles equipped with air brakes considers the feasibility of using air pressure data to determine brake stroke, a vital parameter in determining the effectiveness of the total braking system. Recent statistics show there is an alarming number of vehicles operating with brakes that are out of adjustment even with the introduction and requirement of automatic slack adjustment in 1994. The importance of brake stroke information is thus highlighted. To address this problem, a mathematical model of an air brake chamber is developed and used to investigate parameter sensitivity. A method capable of indirectly determining brake stroke by examining air pressure data is formulated and its effectiveness is proven through simulation and testing.

23 citations


Cited by
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Journal ArticleDOI
TL;DR: A model-based diagnostic system based on a nonlinear model for predicting the pressure transients in the brake chamber that correlates the brake Chamber pressure to the treadle valve (brake application valve) plunger displacement and the pressure of the air supplied to the brake system is presented.
Abstract: The safe operation of vehicles on roads depends, among other things, on a properly functioning brake system. Air brake systems are widely used in commercial vehicles such as trucks, tractor-trailers, and buses. In these brake systems, compressed air is used as the energy transmitting medium to actuate the foundation brakes mounted on the axles. In this paper, a model-based diagnostic system for air brakes is presented. This diagnostic system is based on a nonlinear model for predicting the pressure transients in the brake chamber that correlates the brake chamber pressure to the treadle valve (brake application valve) plunger displacement and the pressure of the air supplied to the brake system. Leaks and "out-of-adjustment" of push rods are two prominent defects that affect the performance of the air brake system. Diagnostic schemes that will monitor the brake system for these defects will be presented and corroborated with experimental data obtained from the brake testing facility

71 citations

DissertationDOI
01 Nov 2010

26 citations

Journal ArticleDOI
01 Aug 2012
TL;DR: In this paper, a pneumatic brake actuator design with high-bandwidth, binary-actuated valves is proposed to implement more effective braking controllers, and the resulting equations are linearized and used to design a closed-loop pressure controller for the actuator.
Abstract: Heavy vehicles have sluggish pneumatic brake actuators that limit the control bandwidth of their anti-lock braking systems. In order to implement more effective braking controllers, it is proposed that high-bandwidth, binary-actuated valves are directly placed on the brake chambers. This article details investigations made into modelling and controlling heavy-vehicle pneumatic brake actuators with a view towards implementing the novel brake actuator design. One-dimensional flow theory is combined with simple thermodynamic arguments for polytropic systems to describe the charging and discharging of a brake chamber. Particular attention is paid to the simulation of perceptible vibrations caused by the piston’s motion at relatively low charging pressures, using a hysteresis model. The resulting equations are linearized and used to design a closed-loop pressure controller for the actuator. Finally, the non-linear performance limits of the valves, caused by dead-zones and time delays, are investigated using a ...

17 citations

Journal ArticleDOI
01 Jun 2016
TL;DR: The brake system of a passenger car is a complex system composed of an assembly of mechanical parts, such as springs and rubber parts, and structures filled with gas and other liquids as mentioned in this paper.
Abstract: The brake system of a passenger car is a complex system composed of an assembly of mechanical parts, such as springs and rubber parts, and structures filled with gas and other liquids. In order to ...

14 citations

Journal ArticleDOI
01 Aug 2004
TL;DR: In this paper, the authors presented the development and validation of an analytical dynamic model of an air-over-hydraulic (AOH) brake system for a commercial vehicle (CV).
Abstract: This study presents the development and validation of an analytical dynamic model of an air-over-hydraulic (AOH) brake system for a commercial vehicle (CV). The brake system model includes ...

11 citations