Tokyo, May 20, 2003 --- Honda Motor Co., Ltd. announced today it has developed the world's first Collision Mitigation Brake System (CMS), which predicts rear-end collisions and assists brake operation to reduce impact on occupants and vehicle damage. This system determines the likelihood of a collision based on driving conditions, distance to the vehicle ahead, and relative speeds, and uses visual and audio warnings to prompt the driver to take preventative action. It can also initiate braking to reduce the vehicle's speed. The new system will be installed in the new Inspire scheduled for release in June of this year, in combination with the "E-Pretensioner," which retracts the seatbelt in anticipation of impact.

The CMS and E-Pretensioner use a millimeter-wave radar to detect vehicles ahead within a range of 100 meters, and then calculate the distance between the vehicles, the relative vehicle speeds, and the anticipated vehicle path to determine the likelihood of a collision. If the system determines that a collision is likely, it sounds an alarm and provides a tactile warning, tightening the seatbelt to prompt the driver to take preventative action. The system also incorporates a number of functions to reduce impact on occupants in the event an impact is unavoidable, including a brake assist function that compensates for insufficient pedal pressure to reduce the speed of impact, and seatbelt control that increases seatbelt tension to hold the driver more securely in place.

Honda considers safety to be one of the most crucial issues automakers face, and as such has long been active in the fields of driver safety education, active safety (preventing collisions), and passive safety (minimizing injury in the event of a collision). In addition, Honda has been promoting research and development of 'Honda Pre-crash Safety Technologies,' which are designed to predict collisions and minimize impacts. CMS and the E-Pretensioner, which warn the driver of impending collisions and reduce impact when collisions are unavoidable, represent the first stage in the practical application of these technologies.


Outline of CMS and E-Pretensioner Operations

1. Primary warning
   When there is a risk of collision with the vehicle ahead or if the distance between the vehicles has become too short, an alarm sounds, and the message "BRAKE" appears on the multi-information display in the instrument panel, prompting the driver to take preventative action.
   
   
2. Secondary warning
   If the distance between the two vehicles continues to diminish, CMS applies light
   braking, and the E-Pretensioner retracts the seatbelt gently two or three times, providing
   the driver with a tactile warning. At this point, if the driver applies the brakes, the
   system interprets this action as emergency braking, and activates the brake assist
   function to reduce impact speed.
   
   
3. Collision damage reduction
   If the system determines that a collision is unavoidable, the E-Pretensioner retracts the
   seatbelt with enough force to compensate for seatbelt slack or baggy clothing,
   providing even more effective driver retention than conventional seatbelt pretensioners,
   which only begin to operate once the collision has occurred. The CMS also activates
   the brakes forcefully to further reduce the speed of impact. The E-Pretensioner is
   designed to operate whenever the driver brakes suddenly and the brake assist functions,
   tightening the seatbelt to secure the driver even if the CMS has not prediced a collision.