Power assembly control method for reducing torsional vibration of transmission system

Abstract

The invention discloses a power assembly control method for reducing torsional vibration of a transmission system, and belongs to the technical field of passenger vehicle automatic transmission control or clutch control. The method specifically comprises the steps of 1, testing torsional amplitude values of each gear, each rotating speed and each accelerator opening degree through an instrument; 2, determining a gear, a rotating speed and an accelerator opening degree interval of which the torsional amplitude value exceeds the standard according to a test result in the step 1; 3, determining the standard reaching condition of the torsional amplitude value of the transmission system after the slip friction difference compensation of different clutches is added; 4, determining the maximum transmission torque under the sliding friction difference according to the sliding friction difference determined in the step 3 and the heating characteristic of the clutch; 5, according to the maximumtransmission torque in the step 4, determining the corresponding accelerator opening degree range and rotating speed range, and adjusting clutch sliding friction control and transmission gear shiftingcontrol; and 6, according to the maximum transmission torque in the step 4, determining the corresponding accelerator opening degree range and rotating speed range, and adjusting the torque output characteristic of the engine.

Description

technical field [0001] The invention belongs to the field of passenger car automatic transmission control technology or clutch control technology, and in particular relates to a power assembly control method for reducing torsional vibration of a drive train. Background technique [0002] With the rapid improvement of the quality of life, people have higher and higher requirements for the automation and comfort of automobiles. As one of the important contents of comfort, vibration and noise have become an important focus of consumers when choosing vehicles. Vibration and roar in the car is a common NVH problem in the car. When the vehicle is excited by the powertrain or the road surface, when the vibration frequency is consistent with the natural mode frequency of the enclosed air in the car cabin, strong coupling will occur, causing the car to vibrate. , The roar is obvious, which seriously affects the ride comfort. [0003] In the early stage of the project development pro...

AI Technical Summary

Problems solved by technology

Vibration and roar in the car is a common NVH problem in the car. When the vehicle is excited by the powertrain or the road surface, when the vibration frequency is consistent with the natural mode frequency of the enclosed air in the car cabin, strong coupling will occur, causing the car to vibrate. , The roar is obvious, which seriously affects the ride comfort

[0003] In the early stage of the project development process, the torsional vibration of the drive train was reduced by matching the drive train, such as increasing the moment of inertia of the flywheel, increasing the torsional stiffness of the drive half shaft, reducing the stiffness of the clutch damper, and adding a dynamic shock absorber. The vibration generation mechanism is complicated, and the torsional vibration amplitude often exceeds the standard during the project development process

In the existing disclosed technologies, the method of reducing the torsional vibration of the drive train in the middle and later stages of the project is mostly to simply increase the slip-friction difference control and increase the shift point of the engine to avoid the large vibration amplitude range, only considering the comfort , did not take into account the economy, drivability and thermal load of the clutch

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