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|Honda Develops World's First 'Collision Mitigation Brake System' (CMS) for Predicting Rear-end Collisions and Controlling Brake Operations
To be installed in upcoming Inspire, in combination with "E-Pretensioner" seatbelt retraction mechanism
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.
CMS & E-Pretensioner System Configuration
Detects vehicles within a range of about 100 meters ahead, in a 16-degree arc.
The system determines driving conditions using a range of sensors that detect factors such as yaw rate, steering angle, wheel speed, and brake pressure.
CMS Electronic Control Unit (ECU)
Based on distance to the vehicle ahead and relative speed obtained from radar information, and on the anticipated vehicle path as determined based on sensor information, the ECU calculates the likelihood of a collision, and warns the driver, and in some cases activates the braking function. The ECU exchanges information as required with the E-Pretensioner, the Variable Signal Analyzer (VSA) and the Meter Unit (see below).
VSA-ECU integrated hydraulic unit
Receives information from the various sensors, and sends this information to the CMS ECU and other control units. Also controls the brake hydraulic unit to activate the brakes based on instructions from the CMS ECU.
Sends instructions to the motorized E-Pretensioner to retract the seatbelt, based on braking instruction signals from the CMS ECU and electronically controlled brake assist signals.
Retracts the seatbelt using an internal motor, based on instructions from the E-Pretensioner ECU. Used in combination with conventional pretensioners.
Meter unit Receives signals from the CMS ECU, and warns the driver of potential danger using an audio alarm and a visual warning.