A hybrid system clutchless synchronous shift control method and system

Abstract

The invention discloses a hybrid power system clutchless synchronous shift control method and system, comprising the following steps: S1 obtains the shift demand, S2 enters the shift preparation, and the synchronous ring is protected when the speed of S3 is different, under the action of the shift motor , the tooth sleeve advances, when it touches the synchronous ring, due to the speed w of the engaging tooth 1 and gear bushing speed w 2 Different, the synchronous ring is subjected to the friction torque of the engaging teeth and the ring torque of the gear sleeve, and the friction torque is greater than the torque of the dial ring, so that the gear sleeve cannot drive the synchronous ring to move, and the gear sleeve cannot pass through the synchronous ring and combine with the engaging teeth; after S4 speed regulation To shift gears, S5 mounts a new gear, resumes torque output, and S6 executes a new round of gear shifting cycle. The clutchless synchronous shift control system of the hybrid power system includes an execution unit, an automatic transmission controller, a shift motor, a hybrid power system, and a synchronous ring. The present invention avoids using a clutch when shifting gears, thereby reducing costs and power interruption time.

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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