Anti-slip Re-adhesion Control Research Articles

<b>Anti-slip Re-adhesion Control Method to Increase Starting Tractive Effort of Inverter-fed Electric Locomotive</b>

<b>Anti-slip Re-adhesion Control Method to Increase Starting Tractive Effort of Inverter-fed Electric Locomotive</b>

Anti-slip Re-adhesion Control for Trains Based on Slip Acceleration

We have already proposed anti-slip re-adhesion control based on a disturbance observer and sensor-less vector control. When the control system detects the slip phenomenon, the system generates a torque command to decrease the slip velocity. Hence, this system requires some tuning control parameters based on running test. This paper proposes a new method of the generating torque command for anti-slip re-adhesion control based on slip acceleration. The fine performance of the anti-slip re-adhesion control using the proposed method is confirmed by numerical simulation.

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

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.

電空協調制御を考慮した滑走再粘着制御への外乱オブザーバによる再粘着制御系の応用

We have already proposed the anti-slip re-adhesion control based on disturbance observer and sensor-less vector control at acceleration mode. This paper proposes a new anti-skid re-adhesion control based on disturbance observer at braking mode. The numerical simulation and experimental results point out that the proposed anti-skid re-adhesion control system has the desired driving wheel torque response for the tested bogie system of electric train.An 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.

Readhesion Control Method without Speed Sensors for Electric Railway Vehicles

This paper describes a slip detection method for electric trains that focuses on the currents of each traction motor and does not use speed sensors. It features a novel anti-slip re-adhesion control method. The slips are detected by finding the torque current difference between induction motors. Simulation results and running tests using a Shinkansen train verify the effectiveness of the proposed method. Using this method, it is found that even small wheel slips can be detected. It is expected that the performance of this control method will be as high as that of the control method that uses speed sensors.

Anti-slip Readhesion Control without Speed Sensor for Electric Railway Vehicles

Since the advent of railway vehicles with three-phase drive in the 1970s, power semiconductors used in electric railway vehicles have been changed from thyristors to GTO thyristors and IGBTs. As for traction motor control, vector control has come into wide use in place of slip frequency control and vector control without speed sensor is at a trial stage for commercial trains. Anti-slip and readhesion control of railway vehicles has greatly progressed by utilizing wheel axle speed information. Locomotives and electric multiple units with speed-sensor-less vector control in the future should have at least the same adhesion performance as that of the alternatives with speed sensor. In this paper, a novel anti-slip readhesion control without speed sensor is proposed. By this method small wheel slips can be easily detected. Its performance is expected to be as high as that of the control with speed sensor. This paper enumerates the characteristics of wheel slip phenomenon and anti-slip control for railway vehicles, explains the running test results that show basics of anti-slip readhesion control with speed sensors, describes an outline of the novel anti-slip readhesion control without speed sensor, and verifies the basic functions by simulation.

Anti-Slip Re-adhesion Control of Electric Motor Coach (2M1C) Based on Disturbance Observer and Speed 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 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, which are, in some cases, driven by one inverter. In order to realize the anti-slip re-adhesion control system for the bogie of electric motor coach, this paper proposes a new anti-slip re-adhesion control based on disturbance observer and speed sensor-less vector control. The numerical simulation and experimental results point out that the proposed anti-slip re-adhesion control system has the desired driving wheel torque response for the tested bogie system of electric motor coach.

An Approach of Anti-slip Readhesion Control of Electric Motor Coach Based on First Order Disturbance Observer

In electric motor coaches, when the adhesion force coefficient between rail and driving wheel decreases suddenly, the electric motor coach has slip phenomena. We have already proposed the anti-slip control system based on ordinary disturbance observer. In order to realize the more stable anti-slip readhesion control in case of large variation of adhesion force coefficient, this paper proposes a new anti-slip readhesion control based on first order disturbance observer and new torque function. In the numerical simulation results in this paper, the proposed anti-slip readhesion control well regulates the driving wheel torque of electric motor coach stably.

Anti-slip Readhesion Control with Presumed Adhesion Force - Method of Presuming Adhesion Force and Running Test Results of High-speed Shinkansen Train -

To analyze slip phenomena, we propose a new practical readhesion control for electric railway vehicles with three-phase drive. The keypoints are optimized axle velocity detection, detection of small slip, slight reduction of torque and torque recovery at readhesion. By running tests with a prototype Shinkansen train "STAR 21", we obtained good results. Nevertheless, slip-readhesion iteration occurs under very bad wheel-rail conditions. So we introduced wheel-rail adhesion prediction in addition and succeeded in utilizing as much adhesion force as possible under any wheel-rail condition. Especially this control has remarkable performance under very bad conditions such as icy rail, steep gradient etc.

Application of “Anti-slip Readhesion Control with Presumed Adhesion Force” to Commuter Transport Electric Cars

Recently trains raise speed and reduce the motor vehicle ratio. It is needed, therefore, to utilize adhesion force more effectively. In running tests of high speed Shinkansen train, it has become clear that slip and readhesion repeat under strict adhesion conditions as far as they rely on the conventional concept of readhesion control. So we have developed a new control method “Anti-slip Readhesion Control with Presumed Adhesion Force” and confirmed in running tests its various effects. Furthermore, we apply it to commuter transport electric cars to research various points such as effects of control improvement, control parameters which are suitable for it, differences between with presuming and without presuming adhesion force, and so on. In running tests, we confirmed that we can utilize adhesion force more effectively by applying the newly developed control method to commuter transport electric cars.

Anti-slip Readhesion Control with Presumed Adhesion Force

Recently trains raise speed and reduce the motor vehicle ratio. It is needed, therefore, to utilize adhesion force more effectively. Although several. anti-slip readhesion control methods have been developed, it has become clear that slip and readhesion repeat under strict adhesion conditions as far as they rely on the conventional concept of readhesion control. So we thought about the reason why conventional anti-slip control methods cause slip/readhesion reiteration under strict adhesion condition and have developed a new control method “Anti-slip Readhesion Control Method with Presumed Adhesion Force”. We confirmed in running tests that we can prevent slip/readhesion reiteration and stably control motor currents even under strict or rapidly changing adhesion conditions by using the newly developed control method.