Solenoid valve control device

摘要

Three-position solenoid valve which outputs an output pressure and can adopt exhaust, overlapping and supply positions. The output pressure is detected by an output pressure sensor and is fed back to a fuzzy control unit. Based on the difference between the output pressure and the command pressure corresponding to the pressure command signal from the brake control unit, such fuzzy control unit calculates a command current value for controlling the three-position solenoid valve by fuzzy reasoning. The command current value can adopt an essentially continuous value, and consequently the three-position solenoid valve can adopt a gentle exhaust state or a gentle supply state. In this way, sudden changes in the output pressure can be suppressed and the output pressure can be made to converge rapidly on the command pressure and eliminate overshoot and undershoot.