Dynamic coordination control method for power domain of hub hydraulic drive hybrid commercial vehicle

Abstract

The invention provides a dynamic coordination control method for a power domain of a hub hydraulic drive hybrid commercial vehicle, and belongs to the field of hybrid vehicle control. The smoothness influence caused by a driving mode needs to be considered when gear shifting is not carried out, and the influence mainly focuses on the intervention and quit transient process of power of a hydraulic drive system or an engine; after gear shifting is started, torque unloading treatment needs to be conducted on an engine due to separation of a clutch, at the moment, power interruption of a vehicle occurs, and the torque requirement of a hydraulic motor needs to be calculated according to the driving torque requirement and the engine torque unloading dynamic process; and after gear switching is completed, when a clutch is combined, in order to rapidly recover vehicle power and ensure that loss in the clutch sliding mode process is minimum, an engine needs to gradually rise torque, and meanwhile the controller accurately calculates the needed motor torque compensation amount. The coordinated control in the process can guarantee longitudinal smoothness of a vehicle when the clutch is combined, meanwhile, the clutch combining process can be accelerated by adjusting the rotating speed of the output shaft of the clutch through dynamic compensation of the hydraulic drive system, and the gear shifting time is effectively shortened.

Description

technical field [0001] The invention relates to the field of control of hybrid vehicles, in particular to a method for dynamic coordination control of a power domain of a hub fluid drive hybrid commercial vehicle. Background technique [0002] Compared with electric motors, hydraulic motors show their advantages in medium and heavy vehicles with high power density and low cost. High power density helps hydraulic drive systems to be more compact than electric drive systems, while low cost accelerates their commercialization. Various hydraulic hybrid vehicle drive systems have been proposed and studied. However, most studies focus on driving system design and optimization of energy management strategies. With the introduction of the concept of vehicle domain control, more and more companies believe that the centralized electronic and electrical architecture instead of the distributed electronic and electrical architecture is the general trend, and the automotive power domain...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome problems such as interruption of vehicle power or uneven driving caused by sudden changes due to the occurrence of dynamic processes such as mode switching and gear shifting during the driving process of the hub fluid drive hybrid commercial vehicle, the present invention is based on the hub fluid drive hybrid commercial vehicle. A dynamic coordination control method in the power domain of a wheel hub hydraulic drive hybrid commercial vehicle is designed, which can give full play to the redundant drive characteristics of the wheel hub hydraulic drive hybrid, realize dynamic coordinated control in the power domain, improve the comprehensive quality of hybrid vehicles, and satisfy users. Balanced demand for smooth shifting, driving economy and vehicle dynamics

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