Mercedes-Benz introduces Intouro Ok hybrid inter-city bus; 48V with supercaps
Whereas its emphasis is on all-electric drive methods for city site visitors, Daimler Buses is introducing the Mercedes-Benz Intouro with a hybrid module for inter-city transport in addition to for a mix of regular-route and touring coach companies. The hybrid module is out there for all two-axle fashions with computerized transmission that includes the torque converter from the ample Intouro vary.
The hybrid module can also be making its debut in an inter-city bus within the new Intouro Ok. Because of this the mannequin vary is concurrently increasing by a flexible and notably maneuverable in addition to economical bus with a variety of functions.
The essential perform of the Intouro hybrid is very simple: A further electrical motor acts as an alternator through the automobile’s braking and overrun phases, changing braking power into electrical energy. This present is saved and is out there to the electrical motor to assist the combustion engine, particularly when shifting off, but additionally when accelerating.
The drive know-how behind it’s easy. One key element of the hybrid drive is the electrical motor. The disc-shaped main meeting with built-in energy electronics and a thickness of eight centimeters has been built-in between the combustion engine and the automated transmission. Its output is 14 kW with a torque of 220 N·m.
The electrical motor primarily assists the combustion engine within the case of excessive output requests, particularly when shifting off. Nonetheless, it doesn’t serve to extend the utmost output, which is why the specs for the automobile’s efficiency and torque stay unchanged. Reasonably, the electrical motor helps the combustion engine and will increase the moving-off efficiency. The combustion engine’s velocity will not be diminished, the height energy is simply throttled imperceptibly and changed by the electrical motor.
As well as, a slight increase by the electrical motor at idle velocity improves the effectivity of the combustion engine. Each of those elements collectively end in a discount within the gas consumption. Within the Intouro, this turns into notably evident in inside metropolis and suburban site visitors the place the motive force is continually alternating between the accelerator and brake pedals. The discount is as much as 5 p.c in suburban and inside metropolis site visitors.
Supercapacitors function short-term power storage items. The present generated by recuperation is saved in supercaps. These electrical power storage items are characterised by a excessive energy density, should not delicate to excessive energy peaks, and have a protracted service life. In distinction to batteries, supercaps are perfect for the fixed and fast adjustments between cost and discharge when stopping and beginning. The Intouro hybrid solely wants a single braking maneuver from 50 km/h to a standstill to cost the power storage items.
The ability storage system of the Intouro hybrid consists of two modules. Every module comprises 16 double-layer capacitors. Each modules collectively have a complete capability of two Ah and are mounted on the rear left-hand facet of the roof (within the route of journey) to save lots of area. A canopy protects the modules from exterior influences and daylight. On the identical time, a perforated facet panel ensures the mandatory cooling by the headwind.
An inverter converts the saved direct present into alternating present to drive the electrical motor. Each the inverter and the electrical motor are water-cooled. The extra radiator for this low-temperature cooling with a most of 65 levels Celsius is positioned beneath the automobile radiator to save lots of area.
48-volt community, low added weight, unmodified operation. The Intouro hybrid doesn’t want a fancy high-voltage community which has its personal needed restrictions and security necessities. The inter-city bus has a separate 48-volt community. That is classed as low-voltage know-how and is secure to make use of.
The unmodified auxiliary assemblies are pushed conventionally. Additional benefits of the compact and uncomplicated technical construction of the extra hybrid drive: The required set up area is small, the define stays unchanged, as does the inside—no passenger seats are misplaced. The added weight of the hybrid drive is 254 kg. In consequence, the overall variety of passenger seats is simply barely diminished and is insignificant in apply.
The builders of the Intouro hybrid depend on tried and examined elements already used within the profitable Citaro hybrid. Nonetheless, in depth adaptation measures had been required on account of a brand new electrical/digital construction of the Intouro with totally different management items.
The recuperation module is now additionally out there for the Intouro for the primary time, whatever the hybrid module. Along with the automobile batteries, it shops the present generated by recuperation and makes it out there when shifting off or on inclines. This relieves the pressure on the alternator and thus on the combustion engine, lowering gas consumption. The power storage unit can also be mounted on the right-hand facet of the roof (within the route of journey) to save lots of area. The recuperation module is a prerequisite for the Intouro hybrid.
The brand new hybrid module shall be celebrating its debut within the Intouro mannequin collection within the compact Intouro Ok. It’s notably manageable with a size of 10.75 meters and a turning radius of simply 18.34 meters. This makes it suited to journeys by way of mountainous areas, on winding roads or for excursions with small teams.
The engine output of the Intouro Ok is optionally 220 kW (299 hp) or 260 kW (354 hp). Bus and coach operators may even select from 4 transmission variants: six-speed handbook transmission, absolutely automated Mercedes-Benz PowerShift transmission or computerized transmission with torque converter from Voith and ZF.