The Research Cars of Mercedes-Benz
Stuttgart
Oct 17, 2011
Performance at its best – Mercedes-Benz C 112
Facts
  • Vehicle: Mercedes-Benz C 112
  • Introduced in: 1991
  • Where: Frankfurt International Motor Show (IAA)
  • Goals: High-performance sports car for testing active dynamic handling systems
  • Powertrain: Four-stroke spark-ignition engine, 12 cylinders, 6.0 litres displacement, 300 kW (408 hp), rear-wheel drive, six-speed manual transmission
Technical highlights
  • Active Body Control (ABC)
    Production launch in the Mercedes-Benz CL (1999, C 215 series)
  • Active rear-wheel steering
  • Active aerodynamics
  • Actively controlled rear airfoil for increasing downforce at the rear axle and for acting as air brake Production launch in the Mercedes-Benz SLR McLaren
    (2003, C 199 series)
  • Electronic tyre pressure control system Production launch in the Mercedes-Benz CL (1999, C 215 series)
  • Autonomous intelligent cruise control
    Production launch under the name DISTRONIC in the Mercedes-Benz S-Class (1998, W 220 series)
  • Electro-hydraulically operated gullwing doors
  • Novel sensors for steering, clutch, brakes, doors, seat and mirror adjustment
For the 1990 racing season in Group C, Mercedes-Benz in cooperation with the Swiss Sauber team fielded the Sauber-Mercedes C 11. Quite successfully: the team was world champion at the end of the season. This spurred on the engineers at Mercedes-Benz. They were looking for a way to test active dynamic handling systems for large-scale production cars and came up with the high-performance sports car C 112. It was powered by a six-litre V12 engine which developed 300 kW (408 hp) and put 580 newton metres of torque on the crankshaft. The idea was to transfer this performance optimally to the road at the physical limits with the highest level of active safety.
Active Body Control
The C 112 was the first car to afford active suspension named Active Body Control (ABC). Each wheel is equipped with a combination of spring and hydraulic servo cylinder. Sensors detect all vehicle motions – vertical displacement, roll and pitch. To eliminate the motion, computers evaluate the data and control the active suspension elements accordingly. The result: an unprecedented level of stable roadholding.
The sports car features active rear-wheel steering. It corrects directional deviation which can be caused, for instance, by ruts and side wind or by road surfaces with changing tyre-to-road adhesion. Even in critical situations, for example load changes during cornering, it maintains the handling and traction behaviour to which the driver is accustomed. An anti-lock braking system (ABS) and acceleration skid control (ASR) of the latest generation complement the technology.
Equipped with all these features, the C 112 offers neutral handling irrespective of load and roadway condition, even during high-speed cornering. Its safety reserves were thus higher than those of previous sports cars – a result from which volume-built Mercedes-Benz cars also benefited.
Active aerodynamics
And the C 112 has even more to offer. One of its highlights is active aerodynamics. Fully adjustable, the front spoiler and the rear airfoil are adapted to the particular driving situation to ensure the optimum compromise between low air resistance on the one hand and high downforce on the other.
During normal operation the rear airfoil is inactive and forms an integral part of the rear body structure; in this inactive state the car has the optimum cd, and lift forces tend toward zero. But it’s quite a different story during high-speed cornering at the critical limit: here, appreciably larger wheel contact forces permit decidedly greater lateral acceleration and more stable handling.
In such a situation, the rear airfoil extends to the rear and upwards within a tenth of a second and, in extreme instances, also changes the angle of incidence. The lip of the front spoiler, changing its height, works together with the rear airfoil. The system enables higher cornering forces and immediately extends the critical limits for the driver.
The rear spoiler is also used to improve the emergency stopping properties: with lightning speed it is raised into the wind when required and helps slow the vehicle down. In addition, the brake system intelligently distributes the brake pressure between front and rear wheels to achieve optimum deceleration. Other components tested in the C 112 are tyre pressure monitoring, which warns the driver of sudden pressure loss, a distance warning radar for vehicles traveling ahead, and partly new and different sensor systems for steering, clutch, brakes, doors, seat and mirror adjustment.
The return of the gullwing doors
As the first vehicle since the C 111, the C 112 again featured gullwing doors. Since the 1950s they have been a symbol of the sports cars from Mercedes-Benz: the 300 SL Coupé (W 194, 1952 and W 198, 1954) was the first to have them – and a car whose excellent technical qualities made it a standout in its day. The C 112 with its streamlined body takes that up again.
 
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