Accelerator pedal apparatus

1. An accelerator pedal apparatus in which an acceleration operation for a vehicle is to be performed by a pedal of the vehicle, the pedal being configured to be operated by a foot, the accelerator pedal apparatus comprising:

a vibration application unit including a vibrator configured to apply vibration to the pedal; and

a vibration application control processor configured to;

generate a first vibration application waveform comprising one or both of a frequency component that is higher than or equal to 10 hertz and lower than or equal to 50 hertz and a frequency component that is higher than or equal to 100 hertz and lower than or equal to 300 hertz;

determine a gain based on control information of the vehicle;

generate, based on multiplying the first vibration application waveform by at least the gain to adjust an amplitude of the vibration application waveform, a second vibration application waveform; and

cause the vibration application unit to apply the vibration to the pedal with the second vibration application waveform,

wherein the control information of the vehicle includes at least one of: information on a vehicle speed of the vehicle; information on an operation speed of the pedal being a speed of an operation received by the pedal; and information on a vibration input to the vehicle from a road surface of a road where the vehicle travels.

2. The accelerator pedal apparatus according to claim 1 , further comprising a vehicle speed detector configured to detect the vehicle speed of the vehicle,

wherein the vibration application control processor is configured to increase the gain in accordance with an increase in the vehicle speed so that a first amplitude of the second vibration application waveform upon detecting a first vehicle speed as the vehicle speed is greater than a second amplitude of the second vibration application waveform upon detecting a second vehicle speed less than the first vehicle speed as the vehicle speed.

3. The accelerator pedal apparatus according to claim 2 , further comprising an operation speed detector configured to detect the operation speed of the pedal,

wherein the vibration application control processor is configured to increase the gain in accordance with an increase in the operation speed.

4. The accelerator pedal apparatus according to claim 3 , further comprising a vibration input detector configured to detect the vibration input from the road surface,

wherein the vibration application control processor is configured to increase the gain in accordance with an increase in an amplitude of the vibration input.

5. The accelerator pedal apparatus according to claim 2 , further comprising a vibration input detector configured to detect the vibration input from the road surface,

wherein the vibration application control processor is configured to increase the gain in accordance with an increase in an amplitude of the vibration input.

6. The accelerator pedal apparatus according to claim 1 , further comprising an operation speed detector configured to detect the operation speed of the pedal,

wherein the vibration application control processor is configured to increase the gain in accordance with an increase in the operation speed so that a first amplitude of the second vibration application waveform upon detecting a first operation speed of the pedal as the operation speed of the pedal is greater than a second amplitude of the second vibration application waveform upon detecting a second operation speed of the pedal less than the first operation speed of the pedal as the operation speed of the pedal.

7. The accelerator pedal apparatus according to claim 6 , further comprising a vibration input detector configured to detect the vibration input from the road surface,

wherein the vibration application control processor is configured to increase the gain in accordance with an increase in an amplitude of the vibration input.

8. The accelerator pedal apparatus according to claim 1 , further comprising a vibration input detector configured to detect the vibration input from the road surface,

wherein the vibration application control processor is configured to increase the gain in accordance with an increase in an amplitude of the vibration input so that a first amplitude of the second vibration application waveform upon detecting a first vibration input as the vibration input is greater than a second amplitude of the second vibration application waveform upon detecting a second vibration input less than the first vibration input as the vibration input.

9. The accelerator pedal apparatus according to claim 1 , wherein the vehicle is configured to switch a traveling mode representing a traveling characteristic of the vehicle from a first traveling mode to a second traveling mode different from the first traveling mode in accordance with an operation of a traveling mode selection switch received from a driver who drives the vehicle,

wherein the vibration application control processor is configured to:

generate multiple gains based on the control information of the vehicle; and

select, in response to the vehicle switching the traveling mode from the first traveling mode to the second traveling mode, a second gain as the gain from the multiple gains so that a second amplitude of the second vibration application waveform in a case where the vehicle travels in the second traveling mode is greater than a first amplitude of the second vibration application waveform in a case where the vehicle travels in the first traveling mode, and

wherein the second gain is greater than a first gain selected in the case where the vehicle travels in the first traveling mode.

10. The accelerator pedal apparatus according to claim 9 , wherein the vehicle is configured to indicate that the second traveling mode is a traveling mode adapted to travel at least one of an icy and snowy road, a muddy road and an unpaved road than the first mode.

11. The accelerator pedal apparatus according to claim 1 , wherein the vehicle is configured to perform one or more controls of:

a traction control;

an anti-lock brake control; and

a behavior stabilization control configured to generate a yaw moment in a direction of suppressing behavior of the vehicle in a case where understeer behavior or oversteer behavior of the vehicle occurs as the behavior of the vehicle,

wherein the vibration application control processor is configured to:

generate multiple gains based on the control information of the vehicle; and

select, in response to the vehicle performing the one or more controls, a second gain as the gain from the multiple gains so that a second amplitude of the second vibration application waveform after performing the one or more controls is greater than a first amplitude of the second vibration application waveform before performing the one or more controls, and

wherein the second gain is greater than a first gain selected before performing the one or more controls.

12. The accelerator pedal apparatus according to claim 1 , wherein the pedal includes a lever, a bracket provided at a first end of the lever and configured to support the lever to be pivotable about a rotation axis extending along a width direction of the vehicle, and a depressing surface member provided at a second end of the lever opposite to the first end and configured to come into contact with a sole of the driver, and

wherein the vibrator is attached to the bracket and configured to sequentially propagate a vibration through the bracket, the lever, and the depressing surface member to the sole of the driver.