Nil CO2
Plug-In hybrid Conversion, Prius G2 and G3 plus Camry Hybrid G1.
The NilCO2 hybrid conversion offers added battery capacity to the vehicle by connecting a 2,4 or 6 kW of additional batteries to the existing onboard factory battery.
It functions to provide a constant charge to the factory battery enabling the vehicle to utilise the factory battery power in preference to the petrol engine thus achieving an overall reduced fuel consumption. You may also choose when to switch on the secondary battery to maximise your fuel economy utilising a single switch adjacent to the driver.
When the secondary battery pack is depleted, it switches off, and the car seamlessly reverts to standard hybrid operation. The secondary battery is not recharged from regenerated on board power, and must be plugged in to the mains supply to recharge at a convenient time. This occurs via a standard mains socket and standard 230VAC extension lead to offer flexibility no matter where you may need to recharge. A sophisticated Battery Management System monitors all cell voltages to ensure the optimum life of the lithium-ion batteries, and charging can take up to 5 hrs. A rapid charge function is not availble as rapid charging of these batteries can reduce their effective life.
The vehicle computer, software and on board electronics are not modified in anyway during the installation, and the normal operating mode of the vehicle is maintained.
This installation agents are located in Sydney, Canberra and Melbourne at present and the installation generally takes 1 day.
Principal of operation is as follows;
Plug-In hybrid Conversion, Prius G2 and G3 plus Camry Hybrid G1.
Having identified the sweet spot, in terms of optimum operating state of charge (SOC of 70-75%) of the Prius HV battery, The SOC that will maximise the electrical energy share of total power to the hybrid drive-train under economic driving conditions. The NilCO2 PHV pack attempts to maintain that SOC by providing HV battery charge plus actual drive-train load current from energy stored in the PHV battery. A single PHV control switch provides the driver with options of when the stored energy can be used. Most dramatic petrol reduction results are observed when the PHV pack capacity is matched to short haul commuting requirements. Such application has yielded averaged weekly petrol consumption figures in the order 1-2 litres/100kM in optimum conditions.
NilCO2 demo 1, is a 2004 G2 Prius currently has a 4kW PHV enhancement pack installed.
The PHV battery is based on Mottcell 40Ah (nominal) LifePO4 triple cell modules, each module has internal over-voltage protection.
Modules are presently configured in two parallel strings each comprising eight sets of two module parallel pairs providing a nominal 51.2V source at a C1 output capacity of 160Ah.
NiCO2 battery management is handled by three major electronic components. The sequenced mode, tri-state, switch-mode charger ensures that cells are safely and efficiently charged and stabilised using CC, CV and CT algorithm.
Battery module balancing and protection. NilCO2 now offers the most efficient non-dissipative, energy transfer, "Robin Hood" mode BMS on the market today. Not only are all individual modules monitored, compared and equalised with minimal energy loss, outputs from the BMS provide control input data to the PHV battery charger and to the Converter/Charger/Regulator.
The 5kW capacity Converter/Charger/Regulator takes input from the 51V PHV battery and converts it to match the Hybrid HV battery (typically 225V-245V for a G2 Prius), and regulates output current to the Prius HV circuit as appropriate.
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