Electrical power steering apparatus
AssigneeJtekt Corporation
InventorMotoo NAKAI
Life of this patent
Estimating the term…
Abstract
A motor control circuit includes a power relay, a converter division, a smoothing condenser, a control circuit and a motor drive circuit, and is connected to a battery as high voltage power and to an electrical motor. The battery is connected with a driving battery having the high voltage such as 288V etc. A step down circuit reduces the high voltage to a low voltage such as 36V etc., charges a low voltage charge device and supplies drive power to the motor drive circuit. When the vehicle collision is occurred, the control circuit detects the collision by a value of detected acceleration, a power change relay is turned on to change to the power source from the low voltage charge device after voltage of the smoothing condenser is reduced, thereby connecting the low voltage to the motor drive circuit.
Claims4
An electrical power steering apparatus including;
- a high voltage power;
- an electrical motor generating steering assist force presented to a steering mechanism of a vehicle;
- a motor drive circuit including a plurality of switching elements supplying drive current to said electrical motor;
- a motor control circuit controlling said motor drive circuit;
- a power relay opening and closing a conduct between said high voltage power and said motor drive circuit;
- a converter division supplying power to said motor drive circuit;
- and
- a smoothing condenser absorbing any current ripple;
- wherein
- said electrical power steering apparatus comprising said converter division including a step down circuit reducing high voltage of said high voltage power to low voltage, a low voltage charge device charged through said step down circuit, and a switch equipped to shut and connect a conduct between said low voltage charge device and said motor drive circuit;
- and
- said electrical power steering apparatus supplies said power from said low voltage charge device to said motor drive circuit at a collision of said vehicle.
Dependencies are inferred from the claim text.