Safety is the Kirkner emergency brake assist to make trucks safer in high-speed traffic congestion

The emergency brake assist system helps prevent truck rear-end collisions, such as highway traffic jams. Knorr-Bremse 's combination of radar and camera technology reduces false alarms in the system and can stop the vehicle if the driver does not intervene after the vehicle has issued an alarm.

On the A11 road heading north from Berlin to Sterling, the radio plays the news in the midday sun. Peter Maisels sat on his articulated truck and let his thoughts drift around: “How much forest area has you burned recently in Mecklenburg-West Pomerania? More than 1000 hectares?” Maisels tries to imagine the numbers, looking to the right Dry landscape. Suddenly, a warning signal rang, and then the cab swayed, and Maisels' head was forced to lean forward. The traffic ahead is stagnant, but there is still a safety gap from the vehicle ahead. Maisels switches from the throttle to the brake pedal, checks behind him and turns on his hazard warning light to avoid rear-end collisions. Before his truck stopped completely, he extended his right hand to get his thermos, and the thermos was still there.

Partial braking first, then emergency braking

Maisels' emergency brake assist system has issued a warning about 80 meters from the traffic jam. But at that moment, the driver was thinking about the forest fire, which is why the emergency brake system automatically starts part of the brakes. “If the distance to the object in front continues to shrink, our brake assist system will start braking from a distance of 50 meters,” explains Dr. Frank Leitner, Product Manager, Knorr-Bremse Commercial Vehicle Systems. There is no emergency braking, but a 1 to 2 meter per second deceleration is enough to make the cab swing forward. “If the driver still does not respond, our emergency brake assist will decelerate from 30 meters to zero.” The huge force works here, just like a sports car, it took only 4.6 seconds to achieve 0 km / h to 100 km / h acceleration, while braking it is slowing down. On a dry road, the truck decelerates at a speed of about 8 meters per second. Just as the sports car stepped on the throttle, the force distributed over the entire backrest is absorbed by the seat belt during braking, and more importantly, it feels like a continually moving forward in a truck.

“When approaching a stationary obstacle, even the old driver feels pressure at the moment.” – Dr. Frank Leitner, Automated Driving Product Manager, Knorr-Bremse Commercial Vehicle Systems

Emergency Brake Assist System from a regulatory perspective

Since November 2015, emergency brake assist systems have been enforced in Europe for newly registered vehicles. However, the driver can choose to turn the feature off during the entire trip after startup. From the current point of view, the required deceleration seems to be quite small: the speed is reduced from 80 km/h to 70 km/h before impact. In 2018, Brussels tightened regulations, but the regulations still allowed vehicles to travel at 60 km/h after the impact.

System combination for error-free detection

“Safety fences on curved roads, slightly sloping roads under overpasses, large road signs that may be attached, ring islands and piers when entering and leaving towns must be reliable through emergency braking techniques and actual obstacle areas on the roads. Distinguish." If a vehicle changes lanes: the distance limit may be violated briefly, but usually it will continue. “The Emergency Brake Assist system like ours combines video imaging and radar sensors to enable them to identify these phenomena with almost no errors. They compare information from two sources in real time, eliminating typical technical errors, constantly Calculate the change in distance and, if the driver does not intervene, achieve braking to standstill, as allowed by road conditions,” Leitner said.

Emergency brake assist system helps prevent truck rear-end collisions such as highway traffic jams

The driver has the best overall view

Once the driver presses on the throttle to intervene, the automatic system separates and returns complete control to the driver. During the warning and partial braking phases, the driver can also return to full control by steering or braking. For Klaus Bogumil, this is logical. “The aid system can of course help in everyday situations,” said the team manager at WormserQualitätslogistik. In fact, he remembers an accident, and the emergency brake assist system could have played a big role. However, Bogumil believes that “in the case of unclear circumstances, the driver is best at seeing the whole situation,” for example, the driver still You can see what's going on behind the truck, which is crucial when deciding whether to switch lanes," he explained.

Correct human error through automatic emergency braking

Frank Leitner also stressed that “the driver is always responsible for controlling the vehicle. When the end of the highway entrance ramp is approaching, if the driver can see that the road behind the left vehicle is unblocked and the lane change is safe, why should the system make Does the vehicle decelerate to zero?” However, he also believes that the emergency brake assist system can reliably correct the mistakes made by human drivers. For example, if the driver turns away from the original obstacle, but the adjacent lane is occupied, in general, the automatic braking system stops detecting obstacles and stops braking. Leitner said: “When the adjacent lane is occupied by another object, our multi-lane system will continue to brake until the vehicle is stationary.” During this time, Peter Maisels can reach for the thermos and enjoy him. The time in the car.

Reading volume: Source: Knorr-Bremse Commercial Vehicle Systems Author: Yue Feng

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