December 15, 1998, Tokyo: Mitsubishi Motors Corporation announces the
development of a new Driver Support System (DSS) that leads the way
in ITS(*1) technology. Integrating some of the latest technologies developed
by the company with other well-proven components, the system comprises:
(1) Lane Departure Warning (new), (2) Side-rear Monitor (new) and, (3)
Preview Distance Control (introduced in January 1995, a world-first
technology). The new DSS is scheduled for application in a new model
to be announced in the fall of 1999.
The company has long been an industry leader in developing driver support
systems that lighten vehicle operation load and compensate for driver
error. It has been an active participant in the Ministry of Transport's
ASV(*2) project that forms the backbone of ITS research in Japan, and
in the AHS(*3) project led by the Ministry of Construction, developing
innovative technology for both projects. The company was also one of
the first auto makers to develop and apply technology that realizes
dramatic improvements in active safety. Industry-first systems include
INVECS(*4), TCL with Road Curvature Preview(*5), Preview Distance Control(*6),
AYC(*7) and ASC(*8).
Features that ensure the new DSS will make a significant contribution
to safer vehicle operation include: Integrated monitoring of road and
traffic conditions in front of, to the side, and behind the vehicle;
Easing the operational demands on the driver and; Prompting the driver
to take greater care in order to avoid lapses of concentration or careless
mistakes.
Mitsubishi Driver Support System
1.Lane Departure Warning System
(1) Aims
This brand new technology is designed to both warn the driver when he
begins straying from his own lane, and also to urge him to steer so
that he stays in the middle of his own lane. In this way, it will help
prevent the driver from drifting into an adjacent lane, from making
contact with central dividing strip or other barriers, or from going
off the road.
(2) Configuration
The system comprises: A miniature CCD video camera in the interior rearview
mirror; Sensors that monitor vehicle status and the driver's handling
actions; An audible and visual warning system that prompts the driver
to be careful and; An actuator fitted to the steering column. The video
camera, which serves as the main system sensor, monitors the lane division
lines ahead of the vehicle.
Lane Departure Warning System
(3) Features
The system uses information on the lane division lines ahead of the
vehicle acquired by the CDD video camera, sensor data on vehicle status
and on how the driver is operating his vehicle to judge whether the
vehicle has started to stray from its lane. When necessary, the system
prompts the driver to be careful using audible and visual warnings and
by making the steering wheel vibrate. At this time, the system encourages
the driver to take corrective action by adding a steering torque that
brings the vehicle back into the middle of own lane. The system leaves
the driver in full control over his vehicle by ensuring the steering
torque applied is not sufficient to interfere with the driver's own
steering efforts, and by disengaging the system when the driver uses
his turn indicators to signal a change in vehicle direction, or when
he turns the steering wheel in an emergency evasive maneuver.
(4) Benefits
Vibrating the steering wheel reduces the time required for the driver
to start making a corrective steering action, compared with an audible
warning only. And the application of a corrective steering torque that
directs the vehicle towards the middle of its own lane makes it possible
to reduce response time further still. With its steering torque information
feature, the Lane Departure Warning System gives the driver more time
to take corrective or evasive action when his vehicle starts to stray
out of its own lane because he has taken his eyes off the road ahead,
or other reasons.
2.Side-rear Monitor
(1) Aims
Employing video cameras installed in the rear of the body, the Side-rear
Monitor System is designed to constantly watch rearview blind spots
and inform the driver of the presence of any vehicles close to his own
when making a lane-change maneuver, as well as prompting him to take
care. In this way, the system is designed to help prevent accidents
that are due to the driver paying insufficient attention to the road
behind him.
(2) Configuration
The system comprises: Wide-angle lens CDD video cameras installed in
the rear of the body; A turn indicator lever that recognizes when the
driver intends to make a lane-change maneuver; Sensors that monitor
vehicle's running status and; Audible and visual warning indicators.
The system also serves as a rearview monitor for reversing maneuvers,
when images from the CDD camera are displayed on a monitor.
Side-rear Monitor System
(3) Features
The system video cameras constantly monitor the adjacent lanes behind
the vehicle that can so easily be blind spots. When a vehicle or motorbike
coming from behind enters the camera's field of view, this covering
most of the area not visible in the rearview mirror, it is recognized
as an approaching vehicle. Regardless of whether there is any vehicle
in the monitor field, the Side-rear Monitor provides audible and visual
warnings to prompt the driver to check the road behind him whenever
he operates his turn signal at the start of a lane-changing maneuver.
(4) Benefits
The system encourages safer driving by warning the driver, when he operates
his turn indicator, of the presence in the rearview blind spot of an
approaching vehicle in the adjacent lane,.
3. Preview Distance Control
(1) Aims
In addition to its cruise control features, the system is designed to
help prevent tail shunting accidents by automatically adjusting inter-vehicle
distance with the vehicle ahead, and by warning the driver when it judges
his vehicle is getting too close to the one ahead. Regulating inter-vehicle
distance as it does, this highly-advanced adaptive cruise control is
designed to further ease the load on the driver.
(2) Configuration
The system comprises: A laser radar that measures inter-vehicle distance
with the preceding vehicle; Sensors that monitor vehicle status and
the driver's operation of his vehicle; An audible and visual warning
system that urges the driver to be careful and; A controller that regulates
engine output and the automatic transmission.
Preview Distance Control System
(3) Features
Using the laser radar to measure the distance to the vehicle ahead,
the system regulates engine output and the automatic transmission to
keep inter-vehicle distance at a safe level. The system provides the
driver with an early warning when it judges the vehicle is getting too
close to the one ahead.
(*1) Intelligent Transport Systems: Known as Advanced Traffic Systems
in Japan, these encompass a number of areas, including traffic control
and public transport.
(*2) Advanced Safety Vehicle: Aims at improving active safety performance,
chiefly by making vehicles "smarter".
(*3) Automated Highway System: A public demonstration of automated
driving and other AHS features was given in October 1996 using road
infrastructure on the Joetsu Expressway before it was officially opened.
(*4) Intelligent & innovative Electronic Control System: Introduced
by MMC in May 1992; a world first. Uses advanced logic circuitry in
the shift scheduling of the automatic transmission and in the TCL (Traction
Control System) to realize significant advances in easy-drive qualities.
(*5) Introduced by MMC in January 1995; a world first. To the advanced
TCL features that enhance tire grip on slippery surfaces, is added a
Preview function, which automatically reduces engine output if the system
senses the vehicle is about to enter a corner too fast when the navigation
system's Route Guidance Mode is engaged.
(*6) Introduced in January 1995; a world first. Using a laser radar
to monitor the distance to the vehicle ahead, this system regulates
engine output to keep a safe inter-vehicle distance. The system also
provides voice and visual warnings that urge the driver to slow his
vehicle should the distance to the vehicle ahead start to close suddenly.
(*7) Active Yaw Control: Introduced in August 1996, a world first.
The system generates a yaw moment by controlling torque split between
left and right rear wheels on 4WD vehicles, thereby enabling the vehicle
to follow the driver's chosen line.
(*8) Active Stability Control: Introduced in August 1996. The system
regulates braking force independently at each of the four wheels, thus
promoting a stable body attitude when braking on slippery surfaces.
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