Optimal starting control method for dual-clutch automatic transmission based on torque compensation

Abstract

The invention provides an optimal starting control method for a dual-clutch automatic transmission based on torque compensation. The method comprises the following steps: S1, taking the maximum engine torque under the accelerator opening degree required by a driver as the torque required by the driver during starting so as to meet the starting requirement of the driver to the maximum extent, and further determining target combination amount of clutches; S2, determining an engine rotating speed control strategy and an engine target rotating speed according to the low-slip-wear requirement of the clutches; S3, determining a combination speed and a synchronous compensation torque of the clutches according to a smoothness requirement; and S4, designing an optimal starting controller according to the starting control principle derived from S1 to S3. According to the method, the starting intention of the driver is taken as the premise of control, it is clear that the dynamic performance requirement is the main control target of starting control, the smoothness requirement and the low-slip-wear requirement of the clutches are the constraint conditions of starting control, and then the optimal starting controller is designed. The starting control target can be effectively met, and synchronous impact can be simply and efficiently eliminated.

Description

technical field [0001] The invention relates to the technical field of power transmission control for automobile starting, in particular to an optimal starting control method for a dual-clutch automatic transmission based on torque compensation. Background technique [0002] The launch control of dual-clutch automatic transmission (DCT) is one of the key technologies in the DCT control system. For many years, the engineering and academic circles have devoted a lot of energy to it. However, there are still many problems in the DCT launch control strategy. Specifically for the single clutch start control, firstly, in terms of input parameters of the control strategy, the influence of the complexity of the vehicle condition and road conditions on the start control is usually overemphasized, and the throttle opening and the rate of change of the throttle opening or even the road gradient are selected as the start control. The input parameters of the driver's starting intention a...

AI Technical Summary

Problems solved by technology

Second, in the selection of the controlled object, the clutch control is usually mainly studied, and the coordinated control of the engine is ignored. The control concept also emphasizes the precise adjustment of the engagement amount and engagement speed of the clutch to adapt to the engine speed and torque changes. The non-linearity of the dynamic characteristics of the engine, the non-linearity of the dry clutch, temperature change characteristics, time-variation and hysteresis, etc., make this control concept unsuitable for launch control

Fourth, in terms of starting synchronous impact, usually more attention is paid to the impact of the initial sliding phase, while ignoring the impact at the synchronous moment. There are also certain defects in the mechanism and solution of synchronous impact

Images