BOSCH Rexroth has supplied its hydrostatic regenerative braking (HRB) system to Berlin-based Haller Umweltsysteme’s latest range of garbage trucks.
The hydraulic system has been installed in the municipal vehicle-manufacturer’s new x2eco waste compactor range.
The supplier says the combined hydraulic pump/motor is connected to the truck’s mechanical drive transmission. When the vehicle’s brakes are applied, it activates the pump mode. The pump uses the energy created by the braking to pressurise the system’s hydraulic accumulator.
Similarly, when the driver accelerates, the HRB system becomes a motor and is driven by the pressure released from the accumulator. The motor delivers this to the vehicle’s drive train and subsequently relieves the engine.
The developer says the stop-start operation of garbage trucks makes the HRB system's fuel-saving and emissions-reduction benefits obvious. Fuel savings of up to 25% are possible.
According to the designer, the system can be retrofitted to any make of municipal truck chassis.
The three-axle, 26t x2eco prototype is currently undergoing trials in Berlin.
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