Dossier QEdu – Plug-in hybrid, features and advantages of the endothermic with the plug

One of the most significant advantages offered from the drive plug-in hybrid is to be able to move in a mode 100% electric for several tens of kilometres. This technology, in fact, provides the combination of a heat engine to one or more units of zero-emission and the presence of rechargeable batteries through the external network, as well as the energy recovery system slowdown. This last feature constitutes the difference of the plug-in compared to the hybrid and “traditional”. All the insights on the functioning of the plug-in hybrid are to be found in the file, QEdu, a gift with Quattroruote march.

The two mode. In the plug-in hybrid, when the battery is fully charged, the car is able to travel at zero emissions, while the petrol engine comes into play when you require more performance. When, instead, the charge of the accumulator is about to end, the car behaves like a hybrid of “normal”, that is, with the electric drive which is confined to intervene in the acceleration phase.

The thermal engine. Often hybrid cars, plug-in no, use engines which operate according to the Atkinson cycle, but this is not a real novelty, having been designed in 1882. At the time, however, required the realisation of a particular engine, while today it is enough to adopt the variable valve timing. This cycle includes a compression stage to be shorter than that of the expansion to increase the efficiency of the engine. The expense is the output power, but the presence of a turbo-compressor or of the electric motor allows to compensate for the disadvantage. And the consumption benefit.

The electric part. On hybrid cars, the engines, zero emissions can be manifold. The Toyota Prius, for example, it takes two: the first one performs the function of the motor-generator, which can be dragged by the thermal engine, or that has the task to initiate the latter; the second, connected to the differential provides the traction. This scheme allows you to do without the exchange. Other Houses, instead, place the electric motor between the thermal and the gearbox, which is automatic: it occurs, for example, on the Hyundai Ioniq, which is fitted with a dual-clutch six-speed transmission. In this case, the guide is most similar to that of cars with conventional.

Only (or almost) zero emission. Another type of hybrid (plug-in and no) is formed by the so-called “in series”, in which the traction is entrusted exclusively to the engine battery by leaving the heat to operate the generator that provides the electricity to the system. In some cases, however, in the face of a request for higher performance, the thermal unit may also be called to contribute to the propulsion.

The batteries. On the plug-in hybrid, the size of the battery increases a lot for greater autonomy on electric power alone (typically, from 30 to 50 km): the Case shall take in kind of the rechargeable lithium-ion battery, which ensures greater energy density. Their charging is carried out via the outlets of domestic (usually of the type Schuco) or the columns public.

The advantages and disadvantages. The hybrid “plug” can be used to reduce fuel consumption and CO2 emissions thanks to their greater autonomy in electric-only mode: this allows you to get values of approval is very low (less than two litres per 100 km and emissions of less than 30 g/km), are compatible with the achievement of the current government incentives. The lists, however, are higher than those of the cars equipped with the system full and mild hybrid because of the presence of the electric motor, also larger batteries and capable of charging system (including jack, cable and charger on-board), an electronic control and safety devices are more complex, all elements that affect the costs of production. At the end, then, the price difference with the hybrid non-rechargeable batteries can be considerable and take a long time to be compensated (when it is not even impossible). Also, to obtain real benefits in terms of consumption, those who choose a plug-in must agree to charge regular batteries at a household outlet or to the gas pumps to the public.

Source: Quattroruote.en – Edited by Anthon K.