| Rely on yourself and on Toyota's electronic control system |
 Toyota
has developed new electronic control systems that make the most of
the basics and add to overall performance. These electronic systems
include ABS for the brakes and TRC for traction control. ABS helps
prevent wheel lock. When the brakes are applied, the tyres begin to
slip. ABS measures the degree of slip to determine when wheel lock
will occur from the degree of slip, and reduces hydraulic pressure
to prevent it. Because ABS allows the wheels to roll - albeit at a
slower speed than the vehicle velocity - the vehicle maintains directional
control and steerability. A cars wheels may tend to spin when starting
off or accelerating. In some cases, loss of traction can cause the
tyres to lose their grip and allow the vehicle to slide sideways.
Toyota's TRC system regulates engine and brakes to help provide as
much control of wheel slip as possible during start-off or acceleration.
If a wheel loses traction, the wheel speed sensor detects a sudden
increase in wheel rotation speed. This information goes to the TRC
electronic control unit (ECU), which commands the engine to reduce
torque. At the same time, the ECU commands the brake actuator to engage
the brakes on the affected wheel until it regains traction. Obviously,
driver awareness of road hazards and appropriate response is also
required to avoid dangerous situations and to give the various systems
time to operate. Toyota's TRC system uses components of ABS and engine
management systems, as well as components designed specifically for
TRC. The system helps the driver maintain control of the automobile
and optimizes traction, even on slippery surfaces. |
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