Overview

Tevva – Electric Range Extender Technology Overview

Adding a range extender blows away the barriers to EV adoption. Charging infrastructure becomes irrelevant. Range anxiety disappears.
Electric trucks now beat diesels on economics because the battery can be optimised to the duty cycle rather than needing to be oversized ‘just in case’.
Always being able to use ALL of the battery, without risk, transforms the economics in favour of the Extended Range Electric Vehicle.

Zero Emission Solution

Tevva  has developed a new environmentally friendly, zero emission solution for back-to-base fleets. Not only is this technology ahead of even the strictest Ultra Low Emission Zones (ULEZ) now being introduced in London and other European and global cities; the Tevva Extended Range Electric Vehicle (EREV) is also dramatically cheaper to operate.

Environmental without Compromise

Our technology and design offers all of the benefits of an electric vehicle, meeting the environmental needs of modern legislation and social acceptance, without the drawbacks of limited range.

Effectively Unlimited Range

Our electric range extender technology removes the operational risk created by pure electric vehicles, allowing unlimited operational range, but typically spending the majority of a day’s operations in pure-electric mode only.

Technology overview

The drive train consists of a single 120kW electric motor, capable of producing 1800Nm (1325 lb ft) from zero rpm, powered by a 74kWh battery located in two packs either side of the chassis. The powertrain also includes a range extender unit, which uses a small capacity internal combustion engine to maintain battery charge whilst on the move.

The dual battery modules are charged overnight from the grid through the on board battery charger, which is compatible with any 3 phase charging point.

Predictive Range Extender Management System (PREMS)

Tevva’s patented Predictive Range Extender Management System (PREMS) algorithm predicts the vehicle’s daily energy consumption, based on GPS route data and weight carried to optimise the use of the range extender – without driver input required – to maximise best use of the battery.

PREMS enables the Tevva range extender to operate as a fully autonomous system.  Not only does the range extender remove range anxiety but its autonomous, algorithm driven action actually increases battery range whilst simultaneously ensure the vehicle delivers zero emissions where it matters most.

Using GPS technology  PREMS can geo-fence zones based on known air quality ‘hot spots’ – it even has the capability to respond to live air quality data,  PREMS therefore ensures that IF  the range extender is needed, it is only used in ‘out of town’ locations; keeping the truck at zero emission status in built up urban areas.

For back-to-base fleets operating in urban areas from bases outside of a city/town, the range extender means that ‘stem mileage’ is no longer a barrier to the deployment of zero emission electric goods delivery vehicles.  Operators can now use a battery electric truck in exactly the same way as they previously used a diesel to do exactly the same work.  Now they simply do it with zero urban emissions and a dramatic saving on cost.

Technical Specifications

Vehicle chassis

Current vehicles are based on a 7.5 -14 tonne  (16,500lb – 31,000lb) chassis, and can be fitted with any body type including temperature controlled.

Performance

Maximum speed: Electronically limited to 50mph (80kph)
Maximum torque: 1800Nm (1325 lb ft) from 0 rpm

Range

Electric-only range: 100 miles (160km) (Nominal) with PREMS technology
Combined range: (RE & EV): 310 miles (500km) w/ 60l fuel tank* | 370 miles (600km) w/ 75l fuel tank*
*Range is dependent on vehicle use, load and duty cycle

Motor, Range Extender and Battery details

Electric motor output: 120kW (161hp)
Traction battery pack capacity: 74kWh,
Traction battery pack voltage: 350 Volts
Battery pack life: 7-10 years (2000 cycles)
Range Extender (RE): 1.5L Internal Combustion Engine (ICE)
RE ICE generator output (max): 74kW (100hp)
RE fuel tank capacity: 60l or 75l (with fast fill nozzle)
Vehicle battery: 24 Volts (Nominal)
Brakes: Regenerative braking system additional to standard vehicle brakes
Charge time: Maximum three hours using 3 phase 32 amp supply (required)

Emissions

Zero greenhouse gas, including Carbon Dioxide (CO2), Methane (CH4), Nitrous Oxide (N2O) and fluorinated gases and zero Nitrogen Oxide (NOx) emissions when running on electric only.

A typical back-to-base operation with a daily duty cycle between 80 and 120 miles daily can be expected, on average, to operate 90% of its daily route in pure electric mode whilst never incurring any risk at all of running out of range.  Therefore emissions can be expected to be 90% lower than a Euro 6 diesel powered truck.

Emissions are minimised through selective use of the ICE RE, which only operates for the minimum duration to enable the vehicle to make full use of battery pack.