Sprung vibration suppression device for vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMitsuhiko Morita
Life of this patent
Estimating the term…
Abstract
A sprung vibration suppression device for a vehicle includes a motor for generating torque to generate driving/braking force at the vehicle wheels and shock absorbers. The device calculates a target driving/braking force including a base requested driving/braking force requested for driving the vehicle and a damping driving/braking force necessary for sprung damping control and controls the driving/braking force output from the motor in accordance with the target driving/braking force. The device sets the damping driving/braking force to zero and increases the damping force generated by the shock absorbers when the base requested driving/braking force is within a rattling noise generation range set for determining whether there is a possibility that rattling noise is generated in the gear device.
Claims4
A sprung vibration suppression device for a vehicle, comprising:
- a motor for generating torque to be transmitted to at least one of a pair of right and left front vehicle wheels and a pair of right and left rear vehicle wheels via a gear device to generate driving/braking force at the at least one of the pair of right and left front vehicle wheels and the pair of right and left rear vehicle wheels;
- shock absorbers for generating damping force to damp sprung vibration;
- and
- an electronic control unit programmed to control driving/braking force output from the motor and damping force generated by the shock absorbers,
- the electronic control unit being programmed:
- to calculate a target driving/braking force including a base requested driving/braking force requested for driving the vehicle and a damping driving/braking force necessary for sprung damping control;
- and
- to control the driving/braking force output from the motor in accordance with the calculated target driving/braking force;
- to determine whether the base requested driving/braking force is within a rattling noise generation range, which is set for determining whether there is a possibility that rattling noise is generated in the gear device, the rattling noise generation range being defined by a first set value as a lower limit value and a second set value as an upper limit value, the first set value being a negative value and the second set value being a positive value;
- to set the damping driving/braking force to zero and increase the damping force generated by the shock absorbers when the electronic control unit determines that the base requested driving/braking force is within the rattling noise generation range;
- to set an increase amount for increasing the damping force depending on an absolute value of the damping driving/braking force when the electronic control unit determines that the base requested driving/braking force is within the rattling noise generation range;
- and
- to add the increase amount to the damping force to increase the damping force.
Dependencies are inferred from the claim text.