Range-extending electric vehicle power system

Abstract

The invention discloses an range-extending electric vehicle power system. The range-extending electric vehicle power system comprises an electromotor and a range-extending device. The range-extending device comprises a generator and a range-extending engine; the generator is electrically connected with the electromotor; power output ends are formed at the two ends of a crankshaft of the range-extending engine, the power output end of one end of the crankshaft is matched with the generator in a transmission mode for electricity generating, and the power output end of the other end of the crankshaft is in transmission fit with a power output end of the electromotor in a separation-union mode, so that joint power output is formed with the electromotor through power involving during joining. The range-extending electric vehicle power system can not only meet the requirement of range extending for an existing electric vehicle, meanwhile, due to the fact that the power output end of one end of the crankshaft of the range-extending engine is in direct transmission fit with the power output end of the electromotor in a separation-union mode, under the normal operation condition, the working requirement can be met only through outputting power by the electromotor, and in other situations of slope climbing or high power output, overall output can be formed by the power of the range-extending engine and the power of the electromotor and is used to drive vehicle wheels to run, that is, two power devices can be used at the same time for outputting as power, so that the output power and the torque of the electric vehicle are increased, and the power performance of the vehicle is substantially improved finally.

Description

technical field [0001] The invention relates to the field of an extended-range electric vehicle, in particular to a power system of an extended-range electric vehicle. Background technique [0002] A range-extended electric vehicle is an electric vehicle with a range extender added on the basis of a pure electric vehicle. The range extender can be a generator set powered by a fuel or gas engine. The main working principle of the range-extended electric vehicle is: when the battery pack in the electric vehicle is low in power, the range extender provides stable electric energy to drive the motor to continue running or charge the battery pack to increase battery life. Extended-range electric vehicles have the advantages of long cruising range, easy maintenance and good performance in energy saving and emission reduction. [0003] Most of the current low-speed electric scooters use the motor to directly drive the wheels through gear reduction. In order to achieve the driving s...

AI Technical Summary

Problems solved by technology

This causes changes in driving conditions, and the motor cannot effectively work within the optimum efficiency range, resulting in low efficiency of electrical energy conversion to mechanical energy and short cruising range of the vehicle

In order to increase the cruising range, increase the battery capacity at any cost, which in turn causes a series of problems such as an increase in cost, an increase in the quality of the vehicle, and an increase in power consumption.

And now there are also some hybrid power systems, either the oil-electric hybrid uses the fuel engine as the main power (this breaks away from the purpose of the electric vehicle), or the pure electric vehicle adds a range extender, which can be powered by a fuel or gas engine The main working principle of the generator set that provides energy is: when the battery pack in the electric vehicle is low in power, the range extender provides stable electric energy to drive the motor to continue running or to charge the battery pack to increase the battery life, but this is still not enough. It can solve the problem of the efficiency of the electric motor to convert the mechanical energy

There is also the use of a motorcycle engine as a gasoline-electric hybrid. Due to the limited power generated by the magneto of the motorcycle engine, it cannot effectively charge the battery. Another thing is that the motorcycle engine is bundled with a gearbox, which can only change the speed of the fuel engine and not the motor. Variable speed, electric power also failed to match torque and speed

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