Chapter III ABS
Section I Function and Composition of ABS
I. Function of ABS
To improve stability of the vehicle;①
To ensure steering ② performance of the vehicle;
To guarantee shortest braking ③ distance.
II. ABS Composition (in Fig. 3-1)
The ABS of LF620 sedan is composed of electronic control unit, hydraulic control unit, sensor and
motor.
Fig. 3-1
1. Electronic control unit (ECU)
Electronic control unit is actually a microprocessor, which calculates the speed of the 4 wheels
and speed increase and decrease according to the signal from the sensor so as to determine the
slide situation and drive the solenoid valve and motor to increase, decrease and maintain the
pressure and so on.
2. Hydraulic control unit (HCU)
Hydraulic control unit is composed of two hydraulic circuits and solenoid valve, which calculates
and determines slide situation to decide the ABS operation according to the signal from the sensor,
and then controls the program to start the solenoid valve and motor to increase, decrease and
maintain the pressure and so on.
3. Sensing
The sensing sends the signal from the gear rotation detection to ECU.
4. Motor
The motor rotates according to the signal of ECU. And the bearing transfers the rotation into
straight reciprocating motion to cycle the brake fluid.
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