If the generator cannot provide enough brake torque on the rear axle, the system uses the pump of the hydraulic modulator to build up additional brake pressure. If the driver steps harder on the brakes, additional hydraulic brake torque is built up on the front axle in the usual way, so that braking force is now applied to both axles of the vehicle. The position of the pedal tells the system how much generator torque is needed. By deliberately giving the brake pedal greater play, the vehicle can initially be braked solely by the electric motor connected to the rear axle, generating electricity. The brake circuit on the driven rear axle is decoupled from the driver’s foot. In the S400 Hybrid, the Bosch ESP hev coordinates the hydraulic and motor brake torque, and controls the electric vacuum pump of the vacuum-based brake booster. “The new technology is part of our modular brake kit, with which we can put together a customized braking system for any vehicle.”High level of energy recovery thanks to decoupled axle “Using ESP hev, all the braking maneuvers defined in the New European Driving Cycle (NEDC) can be fully exploited for energy recovery,” says Gerhard Steiger, president of the Bosch Chassis Systems Control division. The system debuted in mid-2013 in the Mercedes-Benz S400 Hybrid. Bosch’s ESP hev is the world’s first series-produced brake control system that coordinates the braking from the wheel and electric motor without the need for additional components, recovering a particularly high proportion of braking energy in the process. The efficiency of these hybrid and electric vehicles will in large part be determined by their ability to recover as much energy as possible while braking. In the future, large vehicles in particular will need electrified powertrains in order to comply with ever-stricter consumption limits.
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