Starting control method for transmission system of P2 framework

Abstract

The invention provides a starting control method of a transmission system of a P2 framework. The size of a starting load is judged in an algebraic comparison mode of an accelerator opening coefficient and a gradient coefficient, when large-load sliding friction starting or crawling is needed, the rotating speed of a C0 clutch is firstly controlled to be within a certain range in a combined sliding friction mode of the C0 clutch and a C1 clutch, sliding friction of the C1 clutch is controlled by controlling the oil pressure of the built-in C1 clutch, it is guaranteed that the rotating speed of a motor is always kept above the rechargeable lowest running rotating speed, meanwhile, the sliding friction rotating speed of the built-in C1 clutch is controlled within a certain range, and therefore the sliding friction load is reduced, the starting/creeping requirements of the hybrid power transmission can be met under the condition that a built-in clutch structure of the transmission body C1 is not changed.

Description

technical field [0001] The invention relates to the technical field of hybrid transmission control, in particular to a starting control method of a transmission system with a P2 architecture. Background technique [0002] The traditional starting methods of hybrid transmissions with P2 architecture are as follows. The first method is to start with a torque converter. The premise is that the hybrid vehicle is equipped with a torque converter, but it will increase the axial length of the transmission and reduce the The transmission efficiency of hybrid power increases the cost; the second is pure electric start, which has low noise and high torque. When the power is insufficient, the third method is adopted, that is, clutch slip start. Generally, a clutch is set as a slip The clutch performs a friction start. [0003] There are mainly two methods of slipping the clutch to start, namely, the C0 clutch located in the motor and traditional power source (such as the engine), and ...

AI Technical Summary

Problems solved by technology

However, the C1 clutch is already a mature design, with limited space for peripheral expansion, and it is difficult to optimize the design. It is necessary to redesign the parts around C1, which is costly and long-term.

Moreover, the prior art usually cannot use clutches in combination, regardless of any starting conditions, the same clutch is used to start, and the form is relatively single

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