Solving this problem required a combination of methods that involve measuring the relative difference of wheel rpms, lateral acceleration, and yaw rate. For example, while straight stretches of road pose no difficulties for course prediction, curves do. Taking electronic vehicle control to this new level involved some unique challenges for Bosch engineers.
The driver, of course, may intervene at any time to override the ACC. Other engine ECUs manage the appropriate actuator systems.ĭuring operation, the control unit updates target vehicle speed at a frequency of 10 times per second. Based on additional information (yaw rate, lateral acceleration, wheel speed) received from ESP sensors via CAN-Bus, the control unit computes the acceleration or deceleration necessary to maintain the prescribed following distance.
The radar sensor's digital signal processor supplies information on distance, relative speed, and angle of multiple leading vehicles to the control unit.
Sensing distance is between 2 and 120 m for an ultimate sensing angle of 10 degrees, and frequency modulation brings distance/velocity accuracies to within 1 m and 0.5 m/sec. To guarantee reliable sensing of objects, particularly in low visibility conditions, the radar sensor operates in the 76.5-GHz frequency range. Installed at the front of the car, the radar sensor detects the relative speed and distance of vehicles driving ahead. But it goes a step beyond with the inclusion of a mm-wave radar sensor with integrated signal processor and control unit. Planned for series production next year, ACC represents the latest development in the quest to control vehicle motion electronically.Īdaptive cruise control uses all of ESP's sensors to monitor vehicle movement and promote brake control. What's next on the agenda? Adaptive cruise control (ACC), says Wolf-Dieter Jonner, Bosch's director of applications and system development. Building upon ABS technology, the company later introduced traction control followed by its electronics stability program (ESP).
Beyond brake control Adaptive cruise control maintains a safe distance between moving vehicles Karen Auguston Fieldīo xberg, Germany-In the 1970s, engineers at Robert Bosch delivered the first electronically controlled, anti-lock braking system (ABS) specifically designed for production cars.
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