Electric car control system
CA 1205888 A · Owner: Hitachi, Ltd. · Inventors: Jimbo, Yoshiji; Kotake, Kazuyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The DC power supply current-collected on the electric car is connected with a series circuit of the armature of a driving DC motor and an armature current control chopper and with a series circuit of a field winding and a field current control chopper. Both choppers are controlled so that the armature current and field current are maintained constant until the flow rate of the armature chopper reaches the maximum after starting of electric car. In this period of time, the chopping frequency of the armature chopper is higher than that of the field chopper. When the flow rate of the armature chopper reaches the maximum, the chopping frequency of the armature chopper is made coincident with …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted June 10, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 10, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.