 |
|
|
|
 Outline of ABS |
| ABS is a system that helps shorten braking distance and
secure proper vehicle operation by preventing wheel locking in slippery road conditions through control of
the brake fluid pressure. |
| Composition of the ABS Brake System |
|
| The ABS brake system consists of ECU, HCU, and wheel speed sensors: ECU serves as the brain of the system;
HCU increases or decreases the oil pressure that is produced when working the pedal; and the wheel speed sensors
sense the speed of the four wheels and measure the road conditions. As shown in Figure 1, the wheel speed sensors
are positioned at the four wheels and measure the rotation speed of the wheels from the tone wheels that are rotating
together with the wheels; and the information is electronically transmitted to the ECU. |
| - ECU calculates the wheel slips, check the road surface, and give an order
to HCU so that the braking power can be maximized in all conditions. |
| - HCU operates the motor and value, directly decreases,
maintains or increases the brake fluid pressure, and thus control the brakes mounted on the wheels. |
| ABS Effect |
| The wheels can lock and the car slide when the driver applies the brake in a
vehicle without ABS. When braking causes the wheels to completely lock and the car to slide a long distance, braking distance
increases far beyond that of braking under ordinary conditions. What is more serious is that the driver can lose the ability
to steer the vehicle in the desired direction, putting the driver in danger. ABS automatically controls the brake fluid pressure,
prevents wheel locking, shortens braking distance under various road conditions, and facilitates control of the steering.
However, this should not be used to justify driving above safe speeds because the system cannot overcome the physical rules
of nature. |
 |
|
|
|