Electric car control system
AssigneesHitachi, Ltd., Hitachi Automotive Engineering Co., Ltd.
InventorsSanshiro Obara, Hiroyuki Yamada, Shigeyuki Yoshihara, Nobunori Matsudaira
Life of this patent
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Abstract
A control system for an electric car includes a motor connected to a battery as a main power source for driving the electric car, a strong electricity unit having high voltage devices including an inverter for driving the motor based on power supplied thereto from the battery, a weak electricity unit having low voltage circuits including a microcomputer for data processing, and connection devices for connecting the strong and weak electricity units in such a relationship that a signal path is connected between the units as electrically isolated therefrom, wherein signal transmission between the strong and weak electricity units is carried out with use of the signals isolated between the units.
Claims12
A control system for an electric car, comprising:
- a motor connected to a battery as a main power source for driving the electric car;
- a high voltage apparatus including an inverter for outputting a driving output for driving said motor based on power supplied thereto from said battery, said high voltage apparatus outputting data for controlling said inverter;
- a low voltage apparatus, connected to said high voltage apparatus through a signal path, including a microcomputer for processing said data supplied from said high voltage apparatus through said signal path in order to output a calculation result for controlling said inverter, said low voltage apparatus outputting a drive signal to said high voltage apparatus through said signal path for controlling said inverter based on said calculation result;
- connection means for connecting said high and low voltage apparatuses through said signal path in such a manner that said signal path is connected between said high and low voltage apparatuses in an electrically isolated state;
- wherein signal transmission between said high and low voltage apparatuses is carried out using signals electrically isolated between these apparatuses;
- and
- wherein said inverter is controlled in accordance with said drive signal sent from said low voltage apparatus through said signal path.
A control system for an electric car, comprising:
- a motor connected to a battery as a main power source for driving the electric car;
- a high voltage unit including an inverter which outputs a drive output for driving said motor based on power supplied thereto from said battery, the high voltage unit providing a data output;
- a low voltage unit, connected to the high voltage unit through a signal path, including a microcomputer for processing the data supplied from the high voltage unit in order to control the inverter, the low voltage unit providing a drive signal output for the inverter to the high voltage unit through the signal path;
- connection means for connecting said high and low voltage units through the signal path in such a relationship that the signal path is connected between the units in an electrically isolated state;
- wherein signal transmission between said high and low voltage units is carried out with use of the signals isolated between the units;
- and
- wherein said high voltage unit has an inverter drive circuit for driving said inverter, detectors for detecting at least one of input/output currents and voltages of said inverter, a processor circuit for processing outputs of said detectors, and an abnormality detection circuit for detecting an abnormality in said inverter on the basis of detection values of said detectors.
Dependencies are inferred from the claim text.