Control apparatus for electric vehicles
AssigneeHitachi, Ltd.
InventorsYoshiji Jimbo, Seiki Amikura
Life of this patent
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Abstract
There are provided a first chopper CH1 connected in parallel with armatures M1, M2 of main motors of an electric vehicle and operating during a braking mode, and a second chopper CH2 connected in series with the armatures and operating during a powering mode. Both the choppers have a reverse-directional conductivity. A third chopper FCH is further provided to control a field current of the main motors. According to this invention, an arrangement of a main circuit of the electric vehicle is not necessary to be switched over, even though the operation mode thereof is changed. Further, compared with the prior art, the number of the choppers used decreases, so that an economical control apparatus for the electric vehicle can be realized.
Claims6
A control apparatus for an electric vehicle, comprising:
- at least one traction motor having an armature and a field winding for driving the electric vehicle;
- first chopper means, connected in parallel with the armature, for controlling a current flowing therethrough in the forward direction by an on-off operation thereof and for enabling current to flow freely in the reverse direction, the second chopper means being subjected to the on-off operation only during a braking operation mode of the electric vehicle;
- and
- second chopper means, connected in series with the parallel connection of the armature and the first chopper means, for controlling a current flowing therethrough in the forward direction by an on-off operation thereof and for enabling current to flow freely in the reverse direction, the second chopper means being subjected to the on-off operation only during a powering operation mode of the electric vehicle,
- whereby in the braking operation mode an armature current is circulated through the first chopper means when the first chopper means is turned on, and is made to flow through the second chopper means in the reverse direction when the first chopper means is turned off, and in the powering operation mode the armature current is made to flow through the second chopper means when the second chopper means is turned on, and is circulated through the first chopper means in the reverse direction when the second chopper means is turned off.
Dependencies are inferred from the claim text.