Motor control device
AssigneeDenso Corporation
InventorsYusuke Shibata, Takashi Suzuki
Life of this patent
Estimating the term…
Abstract
A motor control device drives first and second motors for outputting torque in braking or non-braking direction in a vehicle brake device, includes: an electric power converter that includes first to third legs having positive and negative switch elements; and a control unit. When the control unit energizes from the positive switch element of the first or third leg to the negative switch element of the second leg, the first and second motors output the torque in a same direction. When an absolute value of current flowing or estimated to flow in at least one of the first motor and the second motor exceeds a current threshold, the control unit drives the positive and negative switch elements of the second leg.
Claims13
A motor control device for driving a first motor and a second motor that output torque in a braking direction or a non-braking direction according to a direction of energization in a vehicle brake device, the motor control device comprising:
- an electric power converter that is accommodated in a casing, converts an electric power of a direct current power supply to supply the electric power to the first motor and the second motor, and includes three legs of a first leg, a second leg and a third leg that are connected in parallel between a positive terminal and a negative terminal of the direct current power supply, each of the three legs having a positive switch element connected to the positive terminal and a negative switch element connected to the negative terminal that are connected to each other in series via an inter-element connection point;
- and
- a control unit that operates the positive switch element and the negative switch element of each leg to control the energization of the first motor and the second motor, wherein:
- the inter-element connection point of the first leg is connected to one terminal of the first motor;
- the inter-element connection point of the third leg is connected to one terminal of the second motor;
- the inter-element connection point of the second leg is connected to another terminal of the first motor and another terminal of the second motor;
- when the control unit energizes from the positive switch element of the first leg to the negative switch element of the second leg, and energizes from the positive switch element of the third leg to the negative switch element of the second leg, the first motor and the second motor are configured to output the torque in a same direction of either the braking direction or the non-braking direction;
- and
- when an absolute value of current flowing or estimated to flow in at least one of the first motor and the second motor exceeds a current threshold, the control unit switches and drives the positive switch element and the negative switch element of the second leg.
Dependencies are inferred from the claim text.