Electronic Stability Control + Moose Test

The ESC is the most significant development in vehicle safety since the introduction of the seat belt and one of the most important crash avoidance systems currently available. This technology has already helped prevent hundreds of thousands of loss of control crashes and saved tens of thousands of lives. The ESC compares the movement of the vehicle's steering wheel with the vehicle's position sensor at all times. If at any moment it detects that the position of the steering wheel does not match the position or direction of the vehicle, the ESC brakes each wheel individually for fractions of a second until the vehicle is positioned matching the same direction indicated by the steering wheel (driver).

The system is assessed by performing a series of so called “double-lane-change” test manoeuvre. These tests are carried out at 80 km/h with sudden steering wheel rotations up to 270 degrees. The sideways displacement, the stability and the vehicle’s ability to follow a straight path are assessed. A robot that acts precisely on the vehicle is used for this procedure.

The manoeuvre with the robot proposes a dynamic determined by the angle and speed of the steering wheel at a certain speed. Together with this, Latin NCAP also assess the system in a real scenario where a visual stimulus (obstacle) forces the driver to make an emergency manoeuvre. This cannot be done by ESC robots as they cannot 'see'. To evaluate the ESC in a real life scenario Latin NCAP performs the “Moose Test”, where at a certain speed the driver must perform an evasive manoeuvre of an obstacle and between certain lane limits. The procedures of the assessment of the Moose Test proposes avoiding an obstacle with an emergency manoeuvre at increasing speeds until the vehicle presents instability and also without touching the obstacles or lane limits.

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