Brake system

A brake system, comprising:

• a brake disc that rotates with a wheel;
• a brake pad that gives a braking force to the brake disc;
• a piston that drives the brake pad;
• a drive mechanism that gives a driving force to the piston;
• a position sensor that detects a position of the piston;
• a thrust sensor that detects a thrust by which the brake pad presses the brake disc;
• and
• a brake control unit that adjusts the braking force by controlling the drive mechanism, wherein
• the brake control unit includes
• a contact position computation unit that computes a contact position at which the brake pad and the brake disc come in contact with each other based on output signals of the position sensor and the thrust sensor,
• a piston position time-series information retainment unit that retains positions of the piston in time series,
• a contact position correction unit that sets, as the corrected contact position, the position of the piston at a time separated from a time corresponding to the contact position computed by the contact position computation unit by only the delay time difference between the output signals of the position sensor and the thrust sensor, and
• a position error computation unit that computes a position error of the contact position based on a delay time difference between the output signals of the position sensor and the thrust sensor,
• wherein the position error computation unit outputs the position error substantially proportionally to the delay time difference between the output signals of the position sensor and the thrust sensor.

A brake system, comprising:

• a brake disc that rotates with a wheel;
• a brake pad that gives a braking force to the brake disc;
• a piston that drives the brake pad;
• a drive mechanism that gives a driving force to the piston;
• a position sensor that detects a position of the piston;
• a thrust sensor that detects a thrust by which the brake pad presses the brake disc;
• and
• a brake control unit that adjusts the braking force by controlling the drive mechanism, wherein
• the brake control unit includes
• a synchronization modification unit that modifies synchronization of the output signals of the position sensor and the thrust sensor based on a delay time difference between the output signals of the position sensor and the thrust sensor,
• a contact position computation unit that computes a contact position at which the brake pad and the brake disc come in contact with each other based on the output signals of the position sensor and the thrust sensor of which the synchronization is corrected, and
• a position error computation unit that computes a position error of the contact position based on a delay time difference between the output signals of the position sensor and the thrust sensor,
• wherein the position error computation unit outputs the position error substantially proportionally to the delay time difference between the output signals of the position sensor and the thrust sensor.