Road surface type detection device

A brake control system comprising:

• a road surface type detection device including:
• at least one sensor element that detects a physical amount of a vehicle, a road surface type estimation unit,
• a storage unit that stores output values of the sensor element corresponding to a plurality of road surface types, wherein the storage unit further stores, as a magnitude of a reference waveform, a magnitude of a waveform of asphalt that is one road surface type out of the plurality of road surface types;
• and
• a determination unit that determines any one road surface type out of the plurality of road surface types based on a magnitude of a waveform of a sensor signal output by the sensor element, wherein the determination unit is configured to:
• compare the magnitude of the waveform of the sensor signal output by the sensor element with the magnitude of the reference waveform,
• in response to a determination that the magnitude of the waveform of the sensor signal output is equivalent to the magnitude of the reference waveform in a plurality of times in succession, determine that a first road surface type is asphalt,
• in response to a determination that the magnitude of the waveform of the sensor signal output is greater than the magnitude of the reference waveform by a specific amount at least once or is smaller than the magnitude of the reference waveform by a specific amount at least once, determine that a second road surface type is gravel, and
• in response to a determination that the magnitude of the waveform of the sensor signal output is smaller than the magnitude of the reference waveform by a specific amount in a plurality of times in succession, determine a third road surface type is grass, and
• a brake control device that includes a braking condition determination unit that determines a braking condition of the vehicle based on a road surface type determined by the road surface type detection device, the brake control device controlling a braking force of the vehicle.