Anti-Slip Regulation (ASR), is typically (but not necessarily) a secondary function of the anti-lock braking system (ABS) on production motor vehicles, designed to prevent loss of traction of driven road wheels. When invoked it therefore enhances driver control as throttle input applied is mis-matched to road surface conditions (due to varying factors) being unable to manage applied torque.
Intervention consists of one or more of the following:
- -Reduces or suppress spark sequence to one or more cylinders
- -Reduce fuel supply to one or more cylinders
- -Brake force applied at one or more wheels
- -Close the throttle, if the vehicle is fitted with drive by wire throttle
- -In turbo-charged vehicles, a boost control solenoid can be actuated to reduce boost and therefore engine power.
Typically, traction control systems share the electro-hydraulic brake actuator (but does not use the conventional master cylinder and servo), and wheel speed sensors with the anti-lock braking system.
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