Drivers Assist System Module (DASM)

The DASM uses the following signals to predict the vehicle path:

• Vehicle speed and Yaw rate from the ABS module
• Steering wheel angle sensor values from the Steering Column Control Module (SCCM)

The DASM integrated Radar monitors and tracks the position of traffic and stationary objects located in front of the host vehicle. The DASM uses the lane boundary information received by the DASM integrated camera in order to calculate a forward trajectory for the host vehicle. If LDW+ is engaged and the vehicle is between lane boundaries, the DASM provides commands to the EPS module in order to keep the vehicle within the lane. When LDW+ is engaged, the system continuously generates an estimate of lane width.

The term lane boundary refers to the following:

• Lane markers
• Road edges
• Curbs
• Bott's dots (round non-reflective raised pavement markers)

Image Acquisition

• In the daytime, the camera is able to detect lane markings where lighting and environmental conditions provide good visibility in excess of 30 meters (98 ft.).
• At night, the camera is able to detect lane markings with lighting conditions provided by standard, production low beam headlamps, with or without additional sources of road illumination, and where environmental conditions provide good visibility in excess of 30 meters (98 ft.).
• The camera shall be capable of compensating for sudden changes in lighting conditions such as during tunnel entry/exit and will not have degraded performance from changes of the camera pitch angle due to vehicle dynamics (e.g. during hard braking or acceleration) or under maximum rated vehicle loading conditions, i.e. Gross Vehicle Weight Rating (GVWR).

DASM integrated Camera

The camera is able to detect and quantify the following information regarding the lane boundaries:

• The longitudinal and lateral distance from the center of the vehicle to the current left lane boundary and adjacent left lane boundary.
• The longitudinal and lateral distance from the center of the vehicle to the current right lane boundary and adjacent right lane boundary.
• The heading angle of the vehicle with respect to the center axis of the current lane.
• Measurement of the radius of curvature of the road ahead of the vehicle.
• The type of lane boundary (i.e. double line, solid line, dashed line).

With this information detected and quantified, the camera will be able to report its x, y, and z positions within the host vehicle.

The DASM integrated cameras field of view is as follows:

• The effective horizontal field of view of the camera is a minimum of 36 degrees.
• The effective vertical field of view of the camera is a minimum of 20 degrees.

The DASM integrated camera is capable of self-monitoring and diagnosis to determine whether it is operating properly. The camera is also able to detect and report if the camera lens has a full blockage condition. The DASM will then provide an IPC message to clean the windshield whenever the system is enabled and the blockage condition exists. The LDW+ visual and haptic feedback will not be provided during a blocked camera state.

The DASM will also transmit internal signals to request a single radio chime under the above condition.