You can never wake someone who is pretending to be asleep, even if the truth is as obvious as the lice on a bald man's head. For example, the debate between plug-in hybrids and extended-range hybrids is currently gaining popularity again. What is the difference between
range extension and plug-in hybrid?
From the working mode point of view, the plug-in hybrid has four working modes, namely EV (electric motor direct drive), series, parallel, and engine direct drive. Both EV and engine direct drive are easy to understand. The series working mode is to use the engine to generate electricity to the motor to drive the vehicle, and the excess electricity to charge the battery. The core and most complex is the parallel working mode. In the parallel state, the engine directly drives the vehicle, and the vehicle system will evaluate based on the current driving status. If the engine has excess power, the excess power will be generated to the battery; On the other hand, if the engine power is insufficient, the electric motor will be activated to drive the vehicle together with the engine.
The extended-range hybrid only has two modes: EV and series. It cannot realize parallel connection and engine direct drive. That is, it only has some working conditions of plug-in hybrid technology. We can understand that the extended-range hybrid is a plug-in hybrid. "Reduced version".
There is an obvious difference in high-speed performance
The technical difference between the two is mainly reflected in the difference in energy consumption between plug-in hybrid models and extended-range hybrid models at high speeds.
When the vehicle is on a high-speed road, the plug-in hybrid model can allow the engine and motor to jointly drive the vehicle through parallel connection to obtain stronger torque performance; especially when cruising at high speed, it happens to be in the efficient range of the engine, and the plug-in hybrid model can drive the vehicle through the engine Directly driving the vehicle, there is no intermediate energy loss and high efficiency. This is the secret of the plug-in hybrid's lower fuel consumption when it loses power at high speeds.
In this scenario, the extended-range hybrid can only be maintained in series mode because there is no parallel connection or direct drive. The engine cannot directly drive the vehicle under high load conditions. It can only burn oil to generate electricity and then provide the energy to the motor for driving. After the secondary conversion, the loss is large and the efficiency is low. Therefore, the fuel consumption of the extended-range hybrid is relatively high at this time, even higher than that of the same level of fuel vehicles.
As Academician Ouyang Minggao said at the 2023 China Electric Vehicles 100 Forum Expert Media Exchange Meeting: "Plug-in hybrids have more operating modes, are more selective, have better adaptability to working conditions, and have the ability to reduce fuel consumption. Of course it's better. But at the same time, the requirements for technical level are higher, and the barriers to entry are of course higher." For example, domestic mainstream plug-in hybrid models are basically equipped with dedicated hybrid engines, and have developed variable stroke, exhaust gas supercharging and a series of new technologies.
plug-in hybrid has a more advanced technical structure, which also means a relatively high research and development threshold and a relatively long research and development cycle. Therefore, plug-in hybrid requires car companies to invest more in research and development, and it is often chosen by mainstream brands such as BYD, Great Wall, Geely, Chery, etc. that are larger in size, have many models, and have more research and development experience. Correspondingly, as a "reduced version" of the plug-in hybrid, the extended-range hybrid has lower technical difficulty, so it is more favored by new power brands.
-
-
-
-
-
-
-
-
-
-