An Optimal Start-up Control Method for Dual Clutch Automatic Transmission Based on Torque Compensation

Abstract

The present invention provides a dual-clutch automatic transmission optimal start control method based on torque compensation. The starting demand of the driver, and then determine the clutch target engagement amount; S2, determine the engine speed control strategy and the engine target speed according to the low slip and wear requirements of the clutch; S3, determine the clutch engagement speed and synchronous compensation torque according to the ride comfort requirements; S4, according to step S1 ~Derived from the starting control principle in step S3, an optimal starting controller is designed. This application takes the driver's starting intention as the premise of the control, and clarifies that the power requirement is the main control target of the starting control, and the ride comfort requirement and the clutch low-slip requirement are the constraints of the starting control. Based on this, the optimal starting controller is designed. The invention can effectively meet the starting control target, and can eliminate the synchronous impact concisely and efficiently.

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...

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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

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