Since the middle of this year, an increasing number of large Mercedes-Benz trucks in Europe have been seen on the roads without the typical large exterior mirrors. Instead, small streamlined camera arms are mounted on the roof frame. They are a new standard feature called MirrorCam which Mercedes-Benz Trucks has fitted to the new Actros.
At this time, Mercedes-Benz is the only manufacturer in the industry to commercialise the MirrorCam concept. The digital rear-view mirror not only looks futuristic but the system can also do much more than conventional main and wide-angle mirrors and its performance far exceeds the legal requirements.
“After a short familiarisation period, drivers experience the advantages of the MirrorCam in many different situations for themselves. Overtaking, manoeuvring, driving in poor visibility and darkness, cornering and bottleneck situations – the MirrorCam makes all this safer and less stressful,” said Patrick Hirth, a cab development mechanic at Mercedes-Benz Trucks who has already driven more than 200,000 kms with the new MirrorCam.
Two cameras, two screens and more
The MirrorCam consists of two cameras mounted on the left and right of the roof frame, two upright monitors mounted on the A-pillars in the driver’s cab and control elements in the door module and in the secondary display. There are also buttons on the passenger side and by the bed to switch on the MirrorCam when the engine is switched off.
The images transmitted by the cameras are transferred to the two 15.2-inch monitors with a resolution of 720 x 1920 pixels. Like the conventional mirror system, the monitor image is divided into a main and wide-angle field of vision. As the MirrorCam cameras are attached to the roof frame and the monitors are located inside the cab, the driver has a much better direct view through the side windows.
The view diagonally ahead, which was previously obstructed by the large exterior mirrors of a conventional mirror system in many situations, is now clear. This is particularly advantageous when approaching junctions and roundabouts, when manoeuvring and in tight bends.
The MirrorCam also assists the driver when reversing and the display then changes to a special manoeuvring view. In particular, reversing around corners is made easier as areas further away from the vehicle are also displayed in the usual size. This view is automatically activated when reverse gear is engaged and is still displayed when driving forwards up to a speed of 10 km/h or until it is deactivated with a button.
Better assessment of traffic behind
The distance lines in the display of the MirrorCam are also useful: they help the driver to better gauge the distance to objects behind the vehicle according to the driving situation. In addition, before moving off, the driver can use the door control panel to position one of the lines to symbolise the end of the vehicle in the display.
To this end, the driver places an object that is well visible, such as a fluorescent jacket, on the ground next to the end of the trailer and aligns the line accordingly. If the system detects a change in the towed unit such as a trailer or semi-trailer, the driver is alerted by a flashing line that the length of the truck may have changed. However, the system only needs to be realigned if this is actually the case. Later on, when overtaking, MirrorCam displays red, orange and yellow markings to show the driver if they can safely move back to the right lane or if a few metres are still needed for the necessary safe distance.
Swivelling camera image for safer cornering
A special highlight of the MirrorCam is demonstrated when cornering with a semitrailer truck. The image on the display on the inside of the corner also swivels, so the driver always has a perfect view of the end of the trailer when cornering. In contrast, with a conventional mirror system, the mirror on the inside of the corner often only shows the side wall of the trailer due to the articulation angle of the semitrailer/tractor combination. Here the driver has a much higher risk of cutting the corner and colliding with an obstacle than when using the MirrorCam – a situation which was captured on video recently when it happened on Malaysian roads.
Works well in rain and darkness
The high mounting position of the camera arms not only ensures excellent visibility, it also gets much less dirty in this position than the lower glass mirror. The water-repellent coating of the camera lenses also means less dirt. Furthermore, the view of the screens is free of reflections and dirt on the side windows of the cab.
At dawn, dusk and at night, the cameras with their powerful light have advantages over a conventional rearview mirror as the system continuously adjusts to the changing light conditions. The same applies to areas with artificial lighting such as a tunnel.
Perfect interaction with Sideguard Assist
MirrorCam and Sideguard Assist work hand-in-hand in the new Actros and the new Arocs. Sideguard Assist is a warning system that helps the driver prevent dangerous accidents during turns (right turns for lefthand drive vehicles). The system gives a visual and an acoustic warning in good time if there is a risk of collision with a stationary or moving object in the warning area on the side of the truck. The driver can then usually brake in time if they have overlooked something on the passenger’s side when turning.
This is particularly important in busy city traffic with lots of cyclists, pedestrians and parked cars. What’s more, Sideguard Assist also functions as a Lane Change Assist for the right side and warns the driver with a yellow or red triangle in the MirrorCam monitor if another road-user is next to the truck in the adjacent lane.
Minimal damage likely
It should also be mentioned that the camera arms of the MirrorCam can be folded in the direction of travel and against the direction of travel. This minimises damage in the event of a collision. Due to the smaller size and the high mounting of the MirrorCam system alone, there is much less risk of it catching on something.
