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Definition: Vehicle Stability Assist (VSA)
VSA stands for Vehicle Stability Assist. It makes use of sensors to detect loss of steering control as well as traction and simultaneously brakes all individual wheels in helping the vehicle regain stability. It was introduced by the car manufacturer “Honda” for all its vehicles in 1997. It has been developed as Honda’s version of Electronic Stability Control (ESC). ESC is an active feature for safety purposes to correct understeer and oversteer.
Vehicle Stability Assist basically combines the Anti-Lock Braking system (ABS) and Traction Control System (TCS) to stabilize the vehicle when it steers either more or less than is required.
ABS prevents the wheels of the vehicle from locking up on applying brakes, especially in an event of slippage.
Traction Control System prevents the wheels from slipping during acceleration.
In addition, side-slip control stabilizes the vehicle during cornering when either of the front or rear wheels slip sideways.
Oversteer: Under oversteering conditions, the rear portion of the vehicle will spin outward as rotational speed of rear wheels is more than that of the front wheels. VSA prevents the vehicle from slipping by braking the outer front wheel to produce an outward moment.
Understeer: In this case, the front wheels have a tendency to slip and this decreases the speed difference between the front and left wheels. When the vehicle steers tangentially off the intended path, VSA reduces the power of the engine and also brakes the inner front wheel, if required.