Parallel-connected torque control system and method for hydraulic hybrid power vehicles

Abstract

The invention discloses parallel-connected torque control system and method for hydraulic hybrid power vehicles, belonging to the torque control systems and methods for multi-energy vehicle powertrains. The system comprises a management layer, a control layer and an execution layer. A management layer module is used for confirming the expected driving torque of a whole vehicle under the current situation by combining with the vehicle speed under the current state according the operation behaviors of a driver to an accelerator pedal. A control layer module is used for judging the operation mode of a hybrid power system according to the information acquired by a plurality of sensors and reasonably distributing the output torques of an engine and a hydraulic hybrid power system. An executionlayer module is used for independently controlling respective controlled objects according a control command of the control layer and feeding back the state variable of each part to the control layer. The invention has the advantages of reasonably distributing the output torques of the engine and a hydraulic pump motor, ensuring that the output torque of the engine is relatively concentrated on an optimal economical zone, and avoiding adverse influences of the frequent starting and stopping of the engine and the hydraulic pump motor to elements.

Description

technical field [0001] The invention relates to a torque control system and method of a multi-energy vehicle power assembly, in particular to a parallel hydraulic hybrid vehicle torque control system and method. Background technique [0002] With the rapid development of industrial technology worldwide, the problems of energy shortage and environmental pollution are becoming more and more serious. Hydraulic hybrid power technology is considered to be one of the effective solutions to solve the energy crisis and environmental pollution problems. Compared with electric hybrid power technology, hydraulic hybrid power has the advantages of high power density and high energy cycle efficiency. At the same time, hydraulic hybrid power has low energy density. , it is impossible to provide driving torque for a long time, so its energy control strategy is quite different from that of electric hybrid. In order to give full play to the energy-saving potential of hydraulic hybrid vehicl...

AI Technical Summary

Problems solved by technology

However, the traditional power distribution strategy only considers the working state of the engine, but ignores the working state of other systems, resulting in an unreasonable energy distribution of the vehicle. Optimize the fuel economy of the vehicle

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