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| Hydrostatic Regenerative Braking System HRB |
| Hydraulic Hybrid for Vehicles with Mechanical Drive Train |
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The HRB is a hydraulic hybrid which is especially developed for vehicles not already having a hydrostatic transmission, such as refuse trucks or buses. Use of an HRB results in significant fuel savings and improved acceleration – depending on the focus of the application.
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How the HRB works
Storing braking energy
The hydraulic axial piston unit is coupled to the mechanical drive train through a gearbox. When braking are applied, the axial piston unit converts kinetic into hydraulic energy and pumps hydraulic fluid into the pressure accumulator; the pressure in the accumulator increases.
Returning the stored energy to assist the transmission
The pressurized hydraulic fluid in the accumulator actuates the axial piston unit, which now works as a motor. Hydraulic energy is converted into kinetic energy. The axial piston unit remains coupled to the mechanical drive train until the pressure accumulator is discharged. The valve manifold controls the filling and discharge process and protects the accumulator from excess pressure. The electronic controller regulates the HRB. In "normal" drive operation the Hydrostatic Regenerative Braking system is decoupled.
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Components of the HRB
- A4VSO Axial Piston Unit + Gearbox
- Hydraulic Accumulator
- Pressure Relief Valve
- Valve Control Block HIC
- Bosch Controller EDC 17
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Fuel savings for a refuse truck
On a refuse truck (empty weight approx. 16 t) the use of a parallel HRB can result in a fuel savings of up to 2.25 liters per hour.
This means the annual operating costs can be reduced by several thousand Euro – not even including additional savings from reduced brake wear.
Calculated fuel savings for a refuse truck (empty weight 16 t) in collection mode:
| Annual operating hours | 1.300 | 1.820 | 2.340 | | Fuel savings (liters/year) | 2.925 | 4.095 | 5.265 |
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Typical applications
- Refuse Trucks
- School Buses
- City Buses
- Shuttle Buses
- Heavy Delivery Vehicles
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