CBC was first introduced by the German automobile manufacturer BMW in 1992 under their new Dynamic Stability Control feature. It was included in the 1992 750i model (their 7-series sedan), and it added a further safety measure to their pre-existing ABS and Automatic Stability Control (ASC) features. When describing the feature, BMW stated, "When braking during curves or when braking during a lane change, driving stability and steering response are improved further."
Wheel locking presents a severe danger to the driver while turning. Wheel locking limits the functionality of the steering function due to the centrifugal force (a force on the vehicle that shifts its balance while turning), which causes imbalances in brake pressure that CBC technology can regulate.
CBC resolves this by using an adaptive brake force system to distribute pressure amongst the brakes of a vehicle while turning. CBC then adjusts the pressure based on the speed of the vehicle and where its position is relative to its curve, optimizing its stability and traction on the road. This makes both steering and braking smoother for the driver, limiting the possibility of the vehicle's wheels locking up.
CBC is then able to partially apply the brakes to ease the vehicle into its desired yaw rate while turning.
The change in radius keeps the vehicle from veering outward and potentially leaving the lane, compensating for the driver's error.
As described in the general formula for torque, lowering brake steer torque will decrease the radius of the turn as the force (
F
{\displaystyle F}
) remains constant, safely keeping the vehicle from veering outward.
CBC shortens the brake distance needed to stop the vehicle while turning. CBC can lower brake pressure, yaw rate, and torque at once to limit lateral movement (movement from the sides). Limiting lateral movement helps improve vehicle stability while turning, allowing CBC to brake smoothly. This helps the driver immediately stop the vehicle when faced with an emergency situation ahead.
Experimentation regarding CBC logic used Software-in-the-Loop (SiL) testing to prove its validity. This uses a simulated environment to test out the software's code in a virtual space. The algorithm used to test CBC logic incorporated many components within the vehicle, such as tires, suspension, and mass. The algorithm also modeled the driver's expected behavior and used both the predicted behavior and the vehicle components to determine the validity of CBC logic.
Results from SiL testing have clearly shown that CBC logic helps keep vehicles within their intended trajectory, enhancing the traditional ABS safety measure.
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