Automated and conventional driving requires uninterrupted availability of braking, especially as electrical systems increasingly replace mechanical systems. Redundancy is required and ideally should be realized with a limited increase of complexity and costs. A conventional brake system comprises two actuators: a vacuum brake booster and an electronic stability control (ESC) unit.
Bosch’s innovation involves the vacuum brake booster being replaced by an intelligent electromechanical booster for redundancy. The combination of the new iBooster + ESC was the first redundant braking system for highly automated driving to go into production in Q3 2017. The system comprises two actuators that are each able to decelerate the vehicle independent of the driver applying the brake pedal. If a failure occurs in either iBooster or ESC actuator, the other maintains the ability to steer during deceleration.
Basing the redundant system on existing components enabled a quick introduction of the first highly automated driving Level 4 series test vehicles in 2017. As a cost-efficient solution with a low installation complexity for platforms with and without HAD vehicles, the company expects iBooster plus ESC to acilitate a wide market penetration of automated driving.
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