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AssigneeHitachi, Ltd.
InventorsSeiji Ishida, Toshiaki Okuyama, Tetsuo Kojima, Kiyoshi Nakata, Akira Horie
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The voltage applied to a power converter is detected by a voltage detector, a function generator produces a voltage proportional to this detected voltage, and a high-pass filter detects an AC component superimposed on the voltage. An adder adds a bias voltage to this AC component, and an adder adds the output from the adder and the output from the function generator. The output from the adder is compared with a triangular wave produced from a rectangular wave generator, and a switching element is controlled to make switching operation according to the compared result. When a DC current is decreased by the AC component, a resistance current Ib is increased so that the AC components superimposed on the current and resistance current can be cancelled out.
A method for controlling a vehicle provided with an electric power converter converting DC electric power supplied from a DC electric power source through a pantograph into AC electric power, a plurality of induction motors driving wheels using said converted AC electric power, a filter reactor disposed between said pantograph and said electric power converter, and a filter condenser disposed at an output side of said filter reactor, the method comprising the steps of:
Dependencies are inferred from the claim text.