The new Hydrostatic Regenerative Braking (HRB) system from Bosch Rexroth stores brake energy in a hydraulic pressure reservoir and relieves the load on the main drive when a vehicle is accelerating – this technology can potentially reduce fuel consumption by up to 25 percent.
Rexroth’s Hydrostatic Regenerative Braking (HRB) system includes a hydrostatic hybrid drive that uses the considerably higher performance of hydraulics, compared with available batteries, to substantially reduce fuel consumption in commercial vehicles.
The system works when the vehicle’s driver presses the brake pedal causing a hydraulic unit integrated in the drivetrain to push hydraulic fluid into a high-pressure reservoir. Each time the driver brakes, the Rexroth HRB system stores energy that would otherwise be lost and the resulting resistance forces the vehicle to decelerate.
In addition, the HRB developed by Rexroth improves the acceleration of the vehicle. When accelerating, the electronically controlled hydraulic pressure reservoir releases the pressure, thus relieving the load on the diesel engine. As a result, the engine consumes less fuel, generates less exhaust gases and functions more quietly.
The major benefit of the system is that it reduces fuel consumption by up to 25 percent in vehicles used for very short distances such as buses, dustbin lorries, fork lift trucks or delivery vehicles driven in city traffic. Fuel consumption and emissions can also be reduced considerably in other commercial vehicles and trucks used for longer journeys as the additional drive energy allows vehicles to be equipped with smaller diesel engines.
The Rexroth hydrostatic hybrid drive functions virtually maintenance and wear-free, especially when compared with electric hybrid drives, and it is not necessary to regularly change the battery. The Rexroth HRB can be integrated and retrofitted in the chassis as an add-on system, without major modifications even in vehicles without hydraulics.
All Rexroth HRB components are based on standard components from the company’s current product portfolio. Prototypes of the Rexroth hydrostatic hybrid drive are currently being tested in on-road vehicles.