Methods and systems for controlling an electric motor
AssigneeHonda Motor Co., Ltd.
InventorsSei Shinohara, Keiichi Ooiso, Satoshi Andou
Life of this patent
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Abstract
A control system that performs control of an electric motor is described. The control system may include a rotating body inertia torque computing unit that uses a rotational state of a vehicle wheel when braking is applied to the wheel to calculate an inertia torque of rotating bodies residing within a span behind the wheel, among members that rotate by the driving force of the electric motor. The control system also may include a controller that performs control of the electric motor to cancel the inertia torque of the rotating bodies based on the calculation result from the rotating body inertia torque computing unit.
Claims15
An electric motor control system included within a vehicle and communicatively coupled to at least one electric motor, the electric motor included within a running gear configured to rotate a drive shaft coupled to a first vehicle wheel, the control system comprising:
- a brake detector configured to identify sudden braking and output a sudden braking signal when sudden braking is identified;
- an inertia torque computing unit configured to determine an inertia torque of at least one rotating component included within the running gear and to determine a first torque command value based at least partially on the inertia torque;
- and
- a torque command value selector configured to receive the first torque command value and the sudden braking signal and to determine a first motor command value based at least partially on the first torque command value.
A method for controlling an electric motor included in a vehicle, the electric motor included within a running gear configured to rotate a drive shaft, which is coupled to at least one vehicle wheel, the method comprising:
- receiving, at an electronic control unit (ECU), a braking signal corresponding to a level of vehicle braking;
- determining, using the ECU, an occurrence of sudden braking based on the signal;
- determining an inertia torque of at least one rotating component included within the running gear;
- determining a first torque command value based at least partially on the inertia torque that when applied to operation of the electric motor, reduces the inertia torque of the at least one rotating component that is transferred to the drive shaft during sudden braking;
- and
- providing a first motor command value to the electric motor, the first motor command value based at least partially on the first torque command value.
Dependencies are inferred from the claim text.