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Locomotives are equipped with slip controllers to limit a value of a wheel slip velocity and conducive to reach required locomotive tractive effort. The slip control methods are developed for tenths years, and the methods are based on several principles. Progressive methods determine an adhesion-slip characteristic slope. This method requires knowledge of an adhesion coefficient value or an adhesion...
The train velocity is needed to be known for many purposes like the train safety systems or a slip control. The train velocity is typically determined from wheelsets velocity. The wheelset velocity is different with the train velocity due to a slip velocity that is needed for a force transmission between wheels and rails. The train velocity measured by this way is the only estimation of the train...
Locomotives reach a high value of tractive effort. The high values of tractive effort can cause problems if an adhesion conditions are poor. A wheel velocity high value that is much greater than the train velocity can occur in this case. The high slip velocity value has to be eliminated because it causes a high wear of wheels and rails and can cause damage to some locomotive mechanical parts. The...
A locomotive needs a slip controller to achieve the maximal tractive effort. Many types of methods are used for this purpose. Some methods use a Kalman filter or other type of estimation. These methods can work precisely and reliably. The Kalman filter provides a filtration of an output signal to eliminate the output signals noise when the Kalman filter inputs are noisy, and a filtration level is...
A train longitudinal velocity is needed for some control devices. The train velocity is typically determined from a locomotive wheelsets velocity. This solution can cause problems when the wheelsets are driven or braked. In these cases, the wheelset velocity is higher or lower than the train longitudinal velocity due to a slip or skid velocity. The problem is typically solved by some type of averaging...
For a locomotive wheel slip velocity detection and slip control are typically used measurement sensors that are mounted on the locomotive. The sensors are typically intended for another purpose e.g. wheel speed measurement or tractive effort determination. When the slip control is based on indirect methods that needed to measure some specific locomotive behavior that occurs during high slip velocity...
The paper presents a control and a power supply of a low power stand-alone photovoltaic system converter. In a stand-alone photovoltaic system load is generally supplied from a photovoltaic panel through a DC-DC converter. In simple photovoltaic system without a battery converter controller and other circuits are supplied from the photovoltaic panel. The systems are appropriate for low power application...
The architecture of the backbone communication channel of the electric locomotive distributed control computer is presented Without need to connect third party devices into the vehicle internal local kernel of distributed control computer simple but reliable and high speed communication NBP protocol can be efficiently used Communication services are embedded into the real time operating system The...
The overview of system design and software architecture of the distributed control computer (DCC) of an electric locomotive is presented. The DCC is organized as a local computer network with the master-slave node access method with a dual serial bus. User task activities in nodes are organized by the preemptive real time operating system with dynamic planning or by simple static executive. Network...
The overview of system design and software architecture of the distributed control computer (DCC) of an electric locomotive is presented. The DCC is organized as a local computer network with the master-slave node access method with a dual serial bus. User task activities in nodes are organized by the preemptive Real Time Operating System with dynamic planning or by simple static executive. Network...
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