Clutch-free synchronous gear shifting control method and system of hybrid power system

Abstract

The invention discloses a clutch-free synchronous gear shifting control method and system of a hybrid power system. The method comprises the following steps: S1, obtaining gear shifting requirements,S2, entering shift preparation, S3, when the rotating speeds are different, protecting a synchronous ring, under the action of a gear shifting motor, allowing a gear sleeve to move forwards, wherein when the gear sleeve makes contact with the synchronous ring, due to the fact that the rotating speed w1 of joint teeth is different from the rotating speed w2 of the gear sleeve, the synchronous ringbears friction torque of the joint teeth and shifting ring torque of the gear sleeve, the friction torque is larger than the shifting ring torque, and the gear sleeve cannot drive the synchronous ringto move and cannot penetrate through the synchronous ring to be combined with the joint teeth; S4, performing gear shifting after speed regulation; S5, engaging a new gear, recovering torque output,and S6, executing a new gear shifting cycle. The clutch-free synchronous gear shifting control system of the hybrid power system comprises an execution unit, an automatic transmission controller, a gear shifting motor, the hybrid power system and the synchronous ring, a clutch is prevented from being adopted during gear shifting, the cost is reduced, and the power interruption time is shortened.

Description

technical field [0001] The invention belongs to the technical field of gear shift control of a hybrid power system of a new energy vehicle, and in particular relates to a clutchless synchronous gear shift mechanism and a gear shift strategy of a new energy hybrid power system during hybrid power coupling and gear shifting. Background technique [0002] Hybrid electric vehicles use the characteristics of low-speed constant torque and high-speed constant power of the motor, and cooperate with the internal combustion engine. Through the switching of power coupling mode and gearbox speed ratio, the system power of the vehicle can be used most effectively for various driving scenarios, improving Fuel economy and reduced emissions, combined with the dual advantages of power and economy, is a better choice at this stage. [0003] Most hybrid coupling mechanisms add motors to the structure of traditional DCT, AT and CVT gearboxes, such as the Geely Lynk & Co P2 / P2.5 system, BYD P2 a...

AI Technical Summary

Problems solved by technology

[0007] 1. The clutch is used, which increases the switching time and the power interruption time is long;

[0008] 2. The hydraulic control system of the clutch has problems such as sealing, and the cost is relatively high

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