Range-extended electric city bus and energy distribution method and system thereof

Abstract

The invention discloses an energy distribution method of a range-extended electric city bus. The energy distribution method includes: detecting a running condition parameter, judging whether the running condition parameter is smaller than a first preset value and larger than a second preset value or not, if so, sending out control commands to close an auxiliary power system and lead a power battery to provide energy; if not, acquiring a current SOC value of the power battery, further judging the current SOC value is larger than a stop-setting value of the auxiliary power system, if so, sending out the control commands to close the auxiliary power system and lead the power battery to provide the energy; if not, sending out the control commands to start up the auxiliary power system to provide the energy for the city bus and to have the power battery recharged. According to the energy distribution method, energy is distributed on the basis of the three parameters of the first preset value, the second preset value and the stop-setting values of the auxiliary power system, so that overall optimization of energy distribution is realized; especially in the third stage, the power battery is fully utilized to provide the energy, and economical efficiency of the city bus is improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an energy distribution method and system for an extended-range electric city bus. Background technique [0002] The extended-range electric city bus refers to the addition of an auxiliary power system on the basis of a pure electric city bus. The auxiliary power system can also provide energy for the car, thereby increasing the driving range of the car. Therefore, there are two energy sources for the extended-range electric city bus, the electric energy stored in the power battery and the electric energy provided by the auxiliary power system. [0003] Using the electric energy stored by the power battery can greatly improve the economy of the car, but the stored electric energy is limited, and a single charge can only travel a limited distance. The energy provided by the auxiliary power system is theoretically unlimited, but the economy is poor and the cost is high. Due to...

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Problems solved by technology

[0006] First of all, since the cyclic working conditions recommended by the above-mentioned national standards were obtained based on a limited number of road conditions sampled in the past few years, in actual operation, the driving routes of city buses will change, and stop signs will be added or reduced, which will cause actual work problems. If the conditions change, that is, the actual driving conditions of the city bus do not match the cycle conditions recommended by the national standard, then the above energy allocation strategy is no longer accurate

[0007] Secondly, in the above-mentioned method of formulating energy distribution, the stop setting value of the auxiliary power system is only obtained according to the cycle conditions and the parameters of the city bus, and the stop setting value is used as the only parameter to determine the energy distribution, which makes the control method simple , easy to implement, this control method can only achieve the transient optimum, but cannot guarantee the global optimum, resulting in a reduction in economic efficiency

[0008] Finally, the above-mentioned energy allocation is formulated at the design stage of the bus. After the formulation is completed, it is written into the control chip of the city bus. Even if the driving route of the bus is changed after the bus is put into use, the energy allocation strategy will not be updated and optimized. It is necessary to replace the control chip of the city bus, and the cost of replacing the control chip of the city bus is very high

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