Parallel hybrid (boosted) range extender powertrain

Abstract

The parallel hybrid powertrain developed by Punch Powertrain provides also a nice solution for range extender and boosted range extender vehicles. While most range extender solutions like the GM Volt or the Jaguar XJ Limo Green Hybrid Concept have a series hybrid topology Punch's uses a parallel hybrid topology. A parallel topology offers a higher efficiency when the vehicle is driven in hybrid mode. This is even more the case by applying the strategy developed at Punch for this powertrain. This strategy can narrow down the combined engine and CVT operation to peak efficiency. This parallel topology does not only offer the possibility to extend the EV-range of the vehicle, it also allows extending the power in cases the vehicle is used in high power situations its EV powertrain is not designed for. By applying this powertrain in vehicles used for urban and suburban deliveries the electric powertrain can be sized for the majority of its use, i.e. low to medium speed driving using low to medium power. The engine can kick in when more power is required, e.g. high speed driving or accelerating with high payloads. Consequently this concept allows using a lower power rating for the electric powertrain (motor/generator and battery). Due to its parallel topology also one electric machine is required. These cost advantages come with the necessity to use a CVT transmission. Most parts of this transmission are already made in high volume while the other parts are carried over from the other hybrid powertrains from Punch. Consequently this CVT transmission can be produced at low cost. As such Punch Powertrain offers a valid alternative to equip electric vehicles with a cost and fuel efficient range extender or boosted range extender powertrain. © 2010 WEVA.