Kiyoshi Ohishi

Re-adhesion control of electric motor coach based on disturbance observer and sensor-less vector control

When the adhesion force coefficient between rail and driving wheel decreases, the electric motor coach has slip phenomena. We have already proposed the anti-slip re-adhesion control system based on a disturbance observer. This system has the fine torque response for one driving wheel driven by one inverter-fed induction motor. However, the bogie of an electric motor coach has four driving wheels driven by two induction motors, which are driven by one inverter. In order to realize the anti-slip re-adhesion control system for the bogie of an electric motor coach, this paper proposes a new anti-slip re-adhesion control based on a disturbance observer and speed sensor-less vector control.

Anti-slip/skid Re-adhesion Control Based on Disturbance Observer Considering Bogie Vibration

This paper proposes a new anti-slip/skid re-adhesion control system for electric commuter train driven by inverter-fed induction motors. This paper designs an instantaneous tangential force estimator between driving wheel and rail, which is based on disturbance observer. The torque command of proposed system regulates to exceed this estimated tangential force in order to avoid undesirable slip phenomenon of driving wheels. For the actual bogie of electric commuter train, we have already proposed the anti-slip/skid re-adhesion control system based on the ordinary disturbance observer and the speed sensor-less vector control. This system has the fine torque response for slip condition. However, this system does not consider the vibration phenomenon of actual bogie dynamics of electric commuter train. In order to extend the anti-slip/skid re-adhesion control to the actual bogie system considering the vibration phenomenon, this paper proposes a new anti-slip/skid re-adhesion control based on a new high order disturbance observer considering the first resonant frequency. The numerical simulation results confirm the validity of the proposed control system.

Realization of fine motion control based on disturbance observer

Recently, disturbance observer has been used in many servo system and industry applications. This paper focus on the fine motion control technology based on disturbance observer. The first motion control application of disturbance observer is the anti-slip/skid re-adhesion control of electric commuter train based on disturbance observer and sensorless vector control. The improvement of adhesion characteristics is important in electric multiple units. We have already proposed the anti-slip/skid re-adhesion control system based on disturbance observer and sensorless vector control. The effectiveness of the proposed method has been confirmed by using the tested bogie system of electric commuter train and the actual electric multiple units. The second motion control application of disturbance observer is the high speed and robust tracking servo system of optical disk recording system. The tracking servo system of optical disk recording system should keep the robust performance against both periodic disturbance and sudden disturbance. For this purpose, this servo system has the robust feedback control system using the free parameter which is designed by disturbance observer. Moreover, in order to suppress the sudden disturbance, this servo system has the sudden disturbance observer.

Anti-slip re-adhesion control based on speed sensor-less vector control and disturbance observer for electric multiple units, series 205-5000 of East Japan Railway Company

The improvement of adhesion characteristics is important in electric motor coach. We have already proposed the anti-slip/skid re-adhesion control system based on disturbance observer and sensor-less vector control. The effectiveness of the proposed method has been confirmed by the experiment and the numerical simulation using the tested bogie system of electric motor coach. In this paper, we apply the proposed method to the actual electric multiple units, which is Series 205-5000 of East Japan Railway Company. In the experimental results of Series 205-5000, this paper discusses that the proposed anti-slip/skid re-adhesion control system has the desired driving wheel torque response and the desired anti-slip control performance.

Anti-Slip/Skid Re-Adhesion Control of Electric Motor Coach Based on Disturbance Observer and Sensor-Less Vector Control

Abstract When the adhesion coefficient between rail and driving wheel decreases, the electric motor coach has slip phenomena. We have already proposed the anti-slip re-adhesion control system based on disturbance observer. This system has the fine torque response for one driving wheel driven by one inverter-fed induction motor. However, the bogie of electric motor coach has four driving wheels driven two induction motors. These induction motors connected in parallel are often driven by one inverter. In order to realize the anti-slip and anti-skid re-adhesion control system for the bogie of electric motor coach, this paper proposes a new re-adhesion control method based on disturbance observer and speed sensor-less vector control.

Anti-skid re-adhesion control based on disturbance observer considering air brake for electric commuter train

This paper proposes a new anti-skid re-adhesion control based on disturbance observer considering the air brake for electric commuter train. We have already proposed the anti-skid re-adhesion control with regenerative braking system based on disturbance observer. This proposed method has been the re-adhesion control using only regenerative braking mode. However, actual train uses both electric brake and air brake in the high-speed range. Hence, this paper proposes a new anti-skid re-adhesion control considering the air brake, which carries out the cooperation control of electric brake and air brake in order to realize a fine re-adhesion control. The numerical simulation results point out that the proposed system has the desired driving wheel torque response and a fine anti-skid re-adhesion control.

Anti-skid re-adhesion control using tangential force estimator based on disturbance observer for electric commuter train

This work proposes a new anti-skid re-adhesion control based on disturbance observer considering the air brake for electric commuter train. We have already proposed the anti-skid re-adhesion control with regenerative braking system based on disturbance observer. This proposed method has been the re-adhesion control using only regenerative braking mode. However, actual train uses both electric brake and air brake in the high-speed range. Hence, This work proposes a new anti-skid re-adhesion control considering the air brake, which carries out cooperation control of electric brake and air brake in order to realize a fine re-adhesion control. The numerical simulation results point out that the proposed system has the desired driving wheel torque response and a fine anti-skid re-adhesion control.

Advanced anti-slip and anti-skid re-adhesion control considering air brake for electric train

The improvement of adhesion characteristics is important in electric commuter train. We have already proposed the anti-slip/skid re-adhesion control system based on disturbance observer and sensor-less vector control. Generally, the actual train uses both electric brake and air brake in the high-speed range. Then, this paper discuss on an anti-skid re-adhesion control system of electric train considering air brake by using the tangential force estimator based on disturbance observer. We apply the proposed method to the actual electric multiple units, which are series 205-5000. The experimental results using actual electric train point out that the proposed system has the desired anti-slip and anti-skid re-adhesion control performance

Anti-slip re-adhesion control based on disturbance observer considering bogie vibration

In order to suppress slip phenomenon, we have already proposed anti-slip re-adhesion control system based on disturbance observer, and we have confirmed that this system drives the train with high adhesion force utilization ratio. However, this system does not consider the vibration phenomenon of actual bogie dynamics of electric commuter train, tangential force estimation is affected by bogie vibration. Hence, the drive control system cannot determine the appropriate motor torque reference, and sometimes reduces the adhesion force utilization ratio. This paper proposes a new anti-slip re-adhesion control system based on the disturbance observer considering the first resonant frequency of bogie system. In order to confirm the validity of the performance of the proposed anti-slip re-adhesion control system, this paper confirms the validity of the proposed system by using the numerical simulation. This paper shows the numerical simulation results simulated using 4M1C motor car model which has a sensor-less vector control system. As the results, the proposed disturbance observer is effective for the vibration suppression of estimated tangential force. The numerical simulation results point out that the proposed adhesion control method has the fine performance on driving acceleration.