Energy-saving control method and system for revolving speed of engine

Abstract

The invention relates to an energy-saving control method and system for revolving speed of an engine. The method comprises the following steps: acquiring required running speed and load required power; and setting a revolving speed value of the engine to be minimum revolving speed on the premise of meeting the required running speed and the load required power. By the energy-saving control method and system for the revolving speed of the engine, the engine runs at economical revolving speed as much as possible on the promise of meeting a vehicle speed requirement and a power requirement, so that the purpose of saving fuel is achieved. Meanwhile, when the revolving speed set value of the engine is changed, a hydraulic system is adjusted in real time so as to guarantee stable running speed and link before and after change of the revolving speed, and stability and driving comfort are good. A power requirement serves as a first priority, and the revolving speed of the engine can be relatively high when high speed or large torque is required. Therefore, a vehicle can meet optional speed requirements. But the required speed of the vehicle is not maximum in most cases, and the advantage of fuel saving can also be played fully.

Description

technical field [0001] The invention relates to the technical fields of construction machinery and agricultural machinery, in particular to an energy-saving control method and system for engine speed. Background technique [0002] In hydrostatic applications, the control of the engine and the hydraulic system are largely independent of each other. During the full range adjustment of the hydraulic system, the engine speed is either maintained at a fixed value or increased with the increase of vehicle speed. Therefore, it is difficult to balance the economy and power of the engine. [0003] In the prior art, there are energy-saving control methods and systems applied to truck cranes. The control target is a closed system composed of a variable pump and a fixed-quantity motor to drive the crane up and down. Its energy-saving control method is to select the speed with the lowest fuel consumption per unit time from the engine speed range according to the current load signal, an...

AI Technical Summary

Problems solved by technology

However, when a typical closed traveling hydraulic system operates normally (such as bulldozers and loaders), not only does the driving speed change, but the load also changes continuously. The engine speed calculated according to the above method will inevitably fluctuate continuously. Affect the stability of the system work and driving comfort

Moreover, the calculation of the engine speed setting value according to the above method will only take into account the purpose of economy, and will not adopt those speed values ​​with high speed and poor fuel consumption, so that it is impossible to take into account the driving situation with low load and high speed requirements (fast driving on flat roads) ), not suitable for closed hydraulic travel system

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