Vehicle, United States
Vehicle, United States

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Yamashita M.,Traction Control laboratory | Soeda T.,Japan Freight Kailway Company
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2011

When a wheel slip occurs on a certain axle or when re-adhesion control is executed, the tractive effort of the wheel-slip axle changes, which causes pitching of the bogie and the carbody. As a result, weight on the other normally adhering axles changes, which may induce wheel slip. This paper explains the development of a control system designed to reduce wheel slip induced by axle-weight changes caused by other wheel slips. To verify the effectiveness of the control method, a water spray wheel-slip test was conducted using an EH200-type DC electric locomotive.

Nakamura T.,Traction Control Laboratory | Taguchi Y.,Traction Control Laboratory | Ogasa M.,Traction Control Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2012

In order to reduce joule loss due to ripple current in multiphase current reversible chopper, an attempt was made to use electromagnetic coupling for an air-core reactor. The relationships among the amplitude of ripple current, duty factor and electromagnetic-coupling coefficient was deduced. It turned out that a specific optimal coefficient of electromagnetic coupling reduces current ripple both on each phase and on total combined. The hypothesis was verified experimentally with newly manufactured reactors, which achieved the optimal electromagnetic coefficient. The weight of the new reactor is 44% lighter than conventional three-phase reactors.

Taguchi Y.,Traction Control Laboratory | Ogasa M.,Traction Control Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2013

Recent years have seen some railway vehicles equipped with secondary batteries on board to improve their energy saving performance. Such vehicles need accurate and stable SOC (state of charge) estimation, which is important for managing battery energy. This paper reports on a SOC estimation method for on board lithium ion batteries developed for the contact-wire and battery hybrid electric railway vehicle. This method enables stable SOC estimation and automatic tuning of parameters, such as battery capacity and battery inner resistance. These characteristics of the estimation method were evaluated by way of running tests on the JRShikoku Yosan railway line.

Taguchi Y.,Traction Control Laboratory | Kadowaki S.,Traction Control Laboratory | Nakamura T.,Traction Control Laboratory | Miki M.,Traction Control Laboratory | And 2 more authors.
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2015

We have converted an existing AC electric multiple unit train (EMU) into a battery-powered and AC-fed dual source EMU (test train) to allow interoperable service between AC electrified lines and non-electrified lines. This paper describes the features and the test results of the developed traction circuit. Results of the on-board battery performance evaluation are also reported, as follows: 1) the running distance, without recharging, of the test train fed by the on-board lithium-ion battery (1382V-83kWh) was approx. 20-30 km, 2) the maximum temperature of the battery was 51.5°C leaving a sufficient margin before the upper limit of 65°C, 3) the time required for quick charging increases when the battery is in low temperature conditions. The running test results demonstrate that the on-board battery performance is sufficient to permit interoperable services between AC electrified and non-electrified lines.

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