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US 2014/0229074 A1Published application
Electronic Control Apparatus
AssigneeHitachi Automotive Systems, Ltd.
InventorsNobuyasu KANEKAWA, Ryoichi KOBAYASHI, Tomonobu KOSEKI, Keisuke HONDA, Atsushi UEHARA
Life of this patent
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Abstract
An electronic control apparatus includes a control unit, a plurality of power supply units for supplying the control unit with power, and a power supply fault detector unit for detecting a fault in the plurality of power supply units. The control unit operates in a normal mode on electric power supplied from the plurality of power supply units when none of the plurality of power supply units is faulty.
Claims14
An electronic control apparatus comprising:
- a control unit;
- a plurality of power supply units for supplying the control unit with power;
- and
- a power supply fault detector unit for detecting a fault in the plurality of power supply units,
- wherein the control unit operates in a normal mode on electric power supplied from the plurality of power supply units, when none of the plurality of power supply units is faulty;
- and
- wherein if at least one of the plurality of power supply units is faulty, the control unit operates in an energy saving mode in which less power is consumed on electric power supplied from the power supply unit that remains fully operational.
4 more elements
An electric power steering system comprising:
- a motor that applies a steering assist force to a steering system of an automobile;
- a current sensor that detects motor current flowing through the motor;
- a rotation angle sensor that detects a rotation angle of the motor;
- a torque sensor that detects steering torque to be transmitted to the steering system;
- a first control unit that controls the motor based on the motor current, the rotation angle, and the steering torque;
- and
- a second control unit that, when a fault occurs in the first control unit, controls the motor based on the rotation angle and the steering torque in place of the first control unit.
4 more elements
Dependencies are inferred from the claim text.