|12V and 48V LC Super Hybrid technology demonstrators. Click to enlarge.|
The Advanced Lead-Acid Battery Consortium (ALABC) and Controlled Power Technologies (CPT) will introduce a low-carbon 48 volt LC Super Hybrid technology demonstrator at the International Vienna Motor Symposium this week. The 48V LC Super Hybrid aims to demonstrate CO2 emissions of 120 g/km, combined with 0 to 100 km/h acceleration in less than nine seconds, in a family-sized sedan.
Employing cost-effective low-voltage micro-mild hybrid technology, the LC Super Hybrid, which is based on a 1.4-liter VW Passat, will make its global debut at the 34th annual powertrain conference. The 48-volt version of the LC Super Hybrid complements the existing 12 volt technology demonstrator unveiled at the Geneva Motor Show in 2012. (Earlier post.)
The more powerful 48-volt demonstrator offers additional functionality including torque assist to the gasoline engine for launch and low-speed transient acceleration; optimized fueling during idle and motorway cruise conditions with electric assist “load point moving” and a leaner fuel calibration; in-gear coast-down; and the ability to harvest significantly more kinetic energy from regenerative braking. It combines advanced lead-carbon batteries with CPT’s production-ready SpeedStart motor-generator system.
The vehicle also includes production-ready electric boosting technology sold by technology developer CPT to Valeo. (Earlier post.) Other international companies involved are powertrain developer and systems integrator AVL based in Germany; drive belt specialist Mubea also from Germany; and Provector, a battery management systems company based in the UK.
We expect to gain an additional 4-8 percent fuel economy improvement over the 1,450 kg kerb weight, 12-volt LC SuperHybrid, which already achieves 50 mpg imperial (42 mpg US and 5.6 l/100km) and 130 g/km on the NEDC New European Drive Cycle and significantly more miles per gallon in real world driving, while delivering the performance and driveability of a 2-liter class vehicle.—Nick Pascoe, CPT chief executive
The partners anticipate that the ALABC advanced lead-carbon battery and CPT switched reluctance motor-generator technologies can appear in the next generation of cars from 2015 onwards, when tighter CO2 emission limits are imposed.
Mild electrification of the powertrain deploying more than 12 volts, but keeping it safely less than 60 volts, combined with new generation advanced lead-carbon batteries, which offer high power density and feature capacitive negative electrodes with added carbon, which have been shown to tolerate the relentless charging and discharging in this micro-mild hybrid application, will be a major factor in providing carmakers with the required energy efficiency and affordability.
Most significantly this low voltage micro-mild hybrid technology with nominal 1 kWh batteries included can be achieved at a quarter of the add-on costs normally incurred with a full hybrid or electric vehicle.—Allan Cooper, European projects coordinator at the Advanced Lead-Acid Battery Consortium
Emerging low voltage mild hybrid electrification standards, led by the German VDA, but with vehicle OEM and tier 1 defined variations, provide a solution for reducing carbon emissions, without compromising performance or adding significant manufacturing cost.
|LC Super Hybrid features CPT SpeedStart advanced next generation stop-start technology (top right) and Mubea belt tensioner. Click to enlarge.|
Pascoe says the auto industry has calculated the additional cost to the motorist of deploying a 48 volt micro-mild hybrid solution to achieve a 30% reduction in CO2 emissions can be as little as £1,000 ($1,500) for the equivalent performance of a current 2-liter family-sized sedan depending on the base vehicle specification and electrical architecture deployed.
The 12V LC Super Hybrid vehicle has now been tested extensively and driven by many vehicle OEMs and automotive journalists. ALABC and CPT expect to release comprehensive performance data regarding the 48V vehicle fuel economy and energy management later in the year, after which both vehicles will be available for evaluation and back-to-back comparisons.