Planetary hybrid power system and vehicles using the power system

Abstract

The invention relates to a planetary series-parallel power system and a vehicle adopting the same. The planetary series-parallel power system comprises an engine, a motor I, a motor II, a front planetary line, a rear planetary line and a system output shaft, wherein a front sun gear is connected with the motor I, and is locked or released by a front locking clutch; a front planet carrier is in transmission connection with the engine; a rear sun gear is connected with the motor II; a rear planetary carrier of the rear planetary line is connected with the system output shaft; a front gear ring is connected with the rear sun gear of the rear planetary line; a rear gear ring is connected with a rear locking clutch used for locking or releasing the rear gear ring; a mode clutch used for enabling the rear planetary line to integrally rotate and enabling the rear gear ring, the rear planetary carrier and the rear sun gear to relatively and freely rotate when in combining or separating is arranged between or among two or more of the rear gear ring, the rear planetary carrier and the rear sun gear respectively. The planetary series-parallel power system can conveniently realize the mode switch of the high-low speed and avoid the problem of power circulation.

Description

Technical field [0001] The invention relates to a planetary hybrid power system and a vehicle using the power system. Background technique [0002] Faced with the current situation of energy shortage and increasingly serious environmental pollution, hybrid electric vehicles are currently the most effective energy-saving vehicle program, and their power systems have three forms: series, parallel and hybrid. The series connection can achieve the optimal control of the engine, but all the energy will undergo secondary conversion, and the loss is large; the parallel connection can achieve better transmission efficiency, but the engine and the output shaft are mechanically connected, which cannot guarantee that the engine is always in a better working area ; Hybrid series can combine the advantages of series and parallel, avoid the shortcomings of the two, is the most optimized configuration of the three. [0003] The current series hybrid vehicles mainly use planetary mechanisms as po...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned existing hybrid power system, the entire rear planetary row is only equivalent to a reducer. Since there is a mechanical point in the planetary hybrid system, that is, the point corresponding to the rotational speed when there is no electric power transmission in the planetary hybrid system, therefore, in the hybrid system During the operation of the linked mode, when the vehicle speed is high and reaches the mechanical point, the speed of the No. 1 motor will reverse, causing it to switch from the power generation state to the driving state, and a power cycle will occur, resulting in a secondary conversion of the electromechanical system, which will affect the system efficiency.

Moreover, in the existing planetary hybrid system, when the vehicle speed is low, most of the power of the engine will be distributed to the No. 1 motor, so the proportion of electric power is too large, which also affects the system efficiency

In addition, the existing hybrid power system has a high demand for the speed of the No. 2 motor at high speeds, resulting in problems such as large volume, high cost, and high requirements for the speed range of the bearings. In addition, it needs to rely on the combination of mechanical brakes when braking at high speeds. braking, poor fuel economy

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