(1) The general braking process is as follows During the normal braking process (without anti-locking phenomenon), each 2-position 2-way pressure regulating solenoid valve in the regulator is not energized. Among them, four liquid inlet solenoid valves are in circulation state, and four liquid outlet solenoid valves are in cut-off state. At the same time, the electric hydraulic pump is not energized. At this time, the brake fluid output from the master cylinder can directly enter each brake wheel cylinder through each fluid inlet solenoid valve, and the brake pressure of each brake wheel cylinder will vary with the brake pressure of the master cylinder That is the normal braking that the car usually carries out. (2) Anti-lock braking process: During the braking process, if the electronic control unit (ECU) determines whether there is a tendency for the wheels to brake and lock according to the wheel speed signal input by the wheel speed sensor. When it is necessary to adjust the pressure of the brake wheel cylinder, the ECU will energize the inlet solenoid valve or the outlet solenoid valve corresponding to the brake wheel cylinder, and automatically judge and process according to the following conditions: Pressure building process During braking, the brake pressure is established with the brake master cylinder through the vacuum booster. All solenoid valves are not energized, brake pressure enters the wheel brakes, and the wheel speed decreases rapidly (this is the same as conventional braking) until the electronic control unit {ECU} knows that the wheels have a tendency to lock. As shown in Figure 3-11a
(1) The general braking process is as follows<br> During the normal braking process (without anti-locking phenomenon), each 2-position 2-way pressure regulating solenoid valve in the regulator is not energized. Among them, four liquid inlet solenoid valves are in circulation state, and four liquid outlet solenoid valves are in cut-off state. At the same time, the electric hydraulic pump is not energized. At this time, the brake fluid output from the master cylinder can directly enter each brake wheel cylinder through each fluid inlet solenoid valve, and the brake pressure of each brake wheel cylinder will vary with the brake pressure of the master cylinder That is the normal braking that the car usually carries out.<br> (2) Anti-lock braking process:<br> During the braking process, if the electronic control unit (ECU) determines whether there is a tendency for the wheels to brake and lock according to the wheel speed signal input by the wheel speed sensor. When it is necessary to adjust the pressure of the brake wheel cylinder, the ECU will energize the inlet solenoid valve or the outlet solenoid valve corresponding to the brake wheel cylinder, and automatically judge and process according to the following conditions:<br> Pressure building process During braking, the brake pressure is established with the brake master cylinder through the vacuum booster. All solenoid valves are not energized, brake pressure enters the wheel brakes, and the wheel speed decreases rapidly (this is the same as conventional braking) until the electronic control unit {ECU} knows that the wheels have a tendency to lock. As shown in Figure 3-11a
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