Operating principle of the iBooster
The iBooster works by detecting the actuation of the brake pedal via an integrated differential travel sensor and sending this information to the control unit. The control unit determines the control signals for the electric motor, which drives a three-stage gear unit that converts the torque of the motor into the necessary boost power. The power supplied by the booster is converted into hydraulic pressure in a standard master brake cylinder. The iBooster can be used with all drivetrain configurations and is particularly suited to hybrid and electric vehicles, as it does not depend on engine vacuum for its operation.
Regenerative braking
The iBooster enables virtually full recuperation with deceleration values of up to 0.3 g when combined with ESPÂ hev, a Bosch system that integrates regenerative braking with conventional hydraulic braking. This is due to the iBoosterâs ability to adjust the supporting force at any time in line with the hydraulic conditions by means of software controls. This covers all common braking maneuvers when driving on roads, and reduces fuel consumption and CO2 emissions by recovering kinetic energy that would otherwise be wasted as heat.
Driver assistance systems and automated driving
The electromechanical design of the iBooster also offers a host of benefits for driver assistance systems and automated driving. Using the electric motor, the iBooster can build up pressure independently, without the need for the driver to apply the brake pedal. Compared with typical ESPÂ systems, the required braking pressure is built up three times more quickly and is adjusted with much greater accuracy through the electronic control system. This enables short stopping distances for automatic emergency braking and covers future NCAP requirements.
In combination with the ESPÂ from Bosch, the iBooster provides the braking system redundancy required by automated vehicles for safety reasons. In case of a failure in one of the braking circuits, the other circuit can still provide sufficient braking performance to bring the vehicle to a safe stop.
Technical specifications
ParameterValue
Supporting forceup to 6.2 kN
Voltage range9.8 â 16 V (main operation range)
Required spaceequal to 8 + 9ââ vacuum brake booster
Weight4.4 â 4.8 kg
Power consumption< 1 A per 10 bar (at comfort pedal application)
Motor powerup to 450 W mechanical
I hope you found this article informative and helpful. If you want to learn more about the Bosch iBooster, you can download the PDF documents from the links below:
[iBooster - Bosch Mobility]
[iBooster - Bosch Mobility]
[Chassis Systems Control iBooster â Vacuum-independent electro ... - Bosch]
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