A Powertrain Control Method for Reducing Torsional Vibration of Driveline

Abstract

The invention discloses a powertrain control method for reducing torsional vibration of a drive train, belonging to the technical field of passenger car automatic transmission control technology or clutch control technology. Torsional amplitude value of each accelerator opening; Step 2: Determine the gear, rotational speed, and throttle opening range where the torsional amplitude value exceeds the standard according to the test results of Step 1; Step 3: Determine the torsional amplitude of the drive train after adding slip-friction compensation of different clutches value up to the standard; Step 4: Determine the maximum transmission torque under this slip and friction difference according to the slip and friction difference determined in Step 3 and the heating characteristics of the clutch; Step 5: Determine the corresponding accelerator according to the maximum transmission torque in Step 4 Adjust the clutch slip control and transmission shift control according to the opening range and speed range; Step 6: According to the maximum transmission torque in Step 4, determine the corresponding throttle opening range and speed range, and adjust the torque output characteristics 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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