Honda ACCORD HYBRID 2005 Service Manual page 1384

A B S / T C S Components
S y s t e m D e s c r i p t i o n ( c o n t ' d )
A B S Features
W h e n the brake pedal is pressed w h i l e d r i v i n g , the wheels can lock before the vehicle comes to a stop. In such an
event, the maneuverability of the vehicle is reduced if the front wheels are locked, and the stability of the vehicle is
reduced if the rear wheels are locked, creating an extremely unstable condition. The ABS precisely controls the slip
rate of the wheels to ensure m a x i m u m grip force f r o m the tires, and it thereby ensures maneuverability and stability
of the vehicle.
The ABS calculates the slip rate of the wheels based on the vehicle speed and the wheel speed, then it controls the
brake fluid pressure to attain the target slip rate.
Grip Force of Tire and Road Surface
COEFFICIENT OF
FRICTION
T A R G E T SLIP RATE
SLIP RATE
T C S Features
The TCS provides low-speed traction. W h e n a drive w h e e l loses traction on a slippery road surface and starts to spin,
the ABS/TCS modulator-control unit applies brake pressure to s l o w the spinning w h e e l . At that t i m e , the ABS/TCS
control unit sends an engine retard signal to the PCM to prevent damage to the t r a n s m i s s i o n .
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