Hydraulic type engineering machine and torque control method and device thereof

Abstract

The invention discloses a torque control method of a hydraulic type engineering machine. The method comprises the steps of acquiring the current rotating speed of a turbine and the current rotating speed of an engine, acquiring the current rotating speed ratio between the turbine and the engine, and acquiring the current displacement ratio between the turbine and the engine according to the current rotating speed ratio; acquiring a standard displacement ratio corresponding to a standard rotating speed ratio corresponding to the current rotating speed of the turbine; judging whether the current displacement ratio is smaller than the standard displacement ratio, adjusting the current rotating speed of the engine to a corresponding standard rotating speed of the engine when the current rotating speed of the turbine reaches the standard displacement ratio if yes, and keeping the current situation unchanged if not. By means of the method, the rotating speed ratio between the turbine and the engine can be optimized, so that the highest displacement ratio is obtained and the phenomena that a system is overheated and energy is wasted are avoided. The invention further discloses a torque control device of the hydraulic type engineering machine corresponding to the method and a hydraulic type engineering machine comprising the torque control device.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a hydraulic engineering machinery, a torque control method and a torque control device thereof. Background technique [0002] In hydraulic engineering machinery, the pump wheel of the torque converter is rigidly connected to the power output device of the engine, and the turbine is the torque output device after torque increase. The different speed ratios of the turbine and the engine correspond to different torque converters. The distance ratio corresponds to different working efficiencies of the torque converter. [0003] During the operation of hydraulic construction machinery, the torque changes in real time according to the load. Due to the different operating levels of the drivers, when facing a large load, some drivers blindly increase the output torque of the vehicle by increasing the accelerator, that is, By increasing the input power of the vehicle, the o...

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Problems solved by technology

[0005] Therefore, the above-mentioned operation method of increasing the throttle cannot obtain a higher variable distance ratio, and often causes the excess energy of the vehicle to be converted into heat energy of the oil, so that the oil temperature rises rapidly, so that the alarm is triggered when it exceeds the critical value. Stop the operation and restart the operation after the oil temperature drops, resulting in low efficiency of hydraulic construction machinery

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