Text/Civil
Japan because of the limitation of land area, is a country with extremely scarce resources, especially in terms of very important energy, in order to reduce the dependence on oil, so Japanese car companies have been very concerned about the "fuel saving" thing, the famous Ota is the pioneer of hybrid technology, but there are also many people forget that NISSAN Nissan, which is also from Japan, has developed its own hybrid technology e-POWER in 2007, but only entered China in 2021 so the popularity is not high.
Let's take a closer look at the second-generation Nissan e-POWER hybrid system:
e-POWER is divided from technical principles, which is similar to a series hybrid system. Its biggest feature is that the power transmission system and the power generation system can be separated from the mechanism, the vehicle gasoline engine is only used as a special power device for power generation, and the system maximizes the advantages of the pure electric system, and the driving experience is infinitely close to the pure electric vehicle. Due to the small battery capacity, the e-POWER does not provide external plug-in charging.
The working mode of the e-POWER hybrid system is roughly as follows:
1, in the relatively flat road at a uniform speed, the vehicle has little power demand for the motor, if the battery is sufficient, then the battery will be powered by the motor to drive the vehicle, which can be understood as pure electric mode.
2, in the case of uniform speed cruising, when the battery power reaches a certain SOC range, the engine will drive the generator to generate electricity and then directly drive the motor, if there is surplus power, the battery is charged.
3. When the battery cannot support the power demand of the motor in the working conditions of acceleration, uphill, overtaking, etc., the battery maintains the output, and the engine generates electricity together to drive the motor.
4. In the case of oil collection, braking, downhill, etc., the motor recovers kinetic energy to charge the battery.
Considering the 1.5kWh battery capacity, the probability of working condition 1 may occur is relatively large only if the speed of the vehicle is slower and the acceleration is slower. If it is on a relatively smooth road or high speed, it should be in 2 or 3 working conditions for a long time.
Advantages of the e-POWER hybrid system:
The experience of retaining the electric drive solves the mileage anxiety in a cost-effective way. The 53KW power of the 1.2L engine can basically meet the power needs of the whole vehicle, and the mileage of up to 1000+ kilometers completely eliminates the mileage anxiety. On the one hand, the fuel consumption effect of the engine is very good, on the other hand, in the case of eliminating the gearbox and drive shaft, the small battery can greatly save space, price and the requirements for battery energy density.
Disadvantages of the e-POWER hybrid system:
1, if it is not in the congested section of the city, then the intervention of the engine will be very frequent, and the corresponding NVH and fuel economy will be reduced.
2, the power of the engine is relatively low, the engine is only 72 horses, 53 kilowatts, although the motor has 100 kilowatts, but the battery is only 1.5kWh, if there is a fierce driving situation will limit the motor power, back to the engine of 72 horses, there may be a lack of power.
The second-generation Nissan e-POWER hybrid system is an improvement over the first generation:
First of all, the integration of the hybrid powertrain is improved: the integrated inverter controller makes the volume 40% less than the previous generation, the weight is reduced by 33%; while shortening the engine intervention time, according to the manufacturer's data, compared with the traditional hybrid car, the engine intervention time is shortened by 10%, so as to reduce the NVH problem caused by the engine.
summary:
Nissan e-POWER hybrid technology is easier to understand, that is, a simple series mode, the engine is not involved in the vehicle drive, all the time is driven by the motor, so it is very close to the driving experience of pure trams. The advantages are low cost, low fuel consumption, and no endurance anxiety; the disadvantage is that the engine power is small and cannot cope with complex and continuous high power output conditions.