Hybrid power hydraulic shovel system and using method thereof

Abstract

The invention discloses a hybrid power hydraulic shovel system. The hybrid power hydraulic shovel system comprises an energy storage device, an electronic control device, a loading swing mechanism, a left walking mechanism, a right walking mechanism, a swing arm hydraulic driving device, a bucket hydraulic driving device and a bucket rod hydraulic driving device. The electronic control device is respectively connected with the loading swing mechanism, the left walking mechanism, the right walking mechanism, the swing arm hydraulic driving device, the bucket hydraulic driving device and the bucket rod hydraulic driving device. The swing arm hydraulic driving device, the bucket hydraulic driving device and the bucket rod hydraulic driving device are connected with one another in parallel. The loading swing mechanism, the left walking mechanism and the right walking mechanism are provided with a loading energy recovery device, a left walking energy recovery device and a right walking energy recovery device respectively. The swing arm hydraulic driving device is provided with a swing arm energy recovery device. The swing arm energy recovery device, the loading energy recovery device, the left walking energy recovery device and the right walking energy recovery device are connected with the energy storage device through the electronic control device.

Description

technical field [0001] The invention relates to a mechanical-electrical-hydraulic integrated construction machinery hybrid power system, in particular to a hybrid power hydraulic excavator system and a use method. Background technique [0002] The traditional hydraulic excavator mainly drives the double pump directly by the engine, and drives the hydraulic cylinder and the hydraulic motor to work through multi-way valve control; when working, the load changes drastically, and the engine often works at a low efficiency point, resulting in low fuel efficiency and poor emissions. At the same time, due to the different loads of different actuators, the load oil pressure is different, and the mutual coupling between the actuators results in a large throttling loss in the multi-way valve system, which further reduces the energy utilization rate of the entire system. [0003] The hybrid technology is recognized as the most promising energy-saving and emission-reduction technology. ...

AI Technical Summary

Problems solved by technology

[0010] (1) For example, in the patent with the patent publication number CN101761104A, it is proposed that the oil return cylinder of the boom and the stick is used for energy recovery through a motor. Due to the difference in oil return pressure in the boom and stick, the two will meet in the oil When the impact occurs, it will lead to poor maneuverability of the boom and stick, and the reduction of recoverable energy.

[0011] (2) For example, the patent disclosed as CN101037869 proposes a control method to ensure the energy storage of the energy storage device, which will inevitably affect the motor / generator when it compensates the engine, and cannot fully compensate for the insufficient power of the engine, resulting in the system maneuverability is affected

[0012] (3) For example, in the patent with the patent publication number CN101973271A, five actuators including the single-variable pump boom, arm, bucket, and left and right travel, due to the difference between the loads, will lead to the energy consumption efficiency of the hydraulic system Low, and the structure of the hydraulic system is complex

However, in actual work, the load of the excavator changes drastically, and the motor generator cannot fully compensate for the violently changing power of the engine, and the fuel efficiency and emission performance of the engine are still poor.

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