Method and system for controlling engine speed and boom-type engineering machine

摘要

The disclosure relates generally to the field of boom-type engineering machinery, which discloses particularly an engine speed control method used to control an output speed of an engine of a boom-type engineering machine during a boom action including: detecting a load pressure of a hydraulic system and a moving speed of a boom; determining a target speed of the engine according to the load pressure and the moving speed of the boom, by a central control unit; and sending, by the central control unit, the target speed of the engine to an engine control unit, and performing, by the engine control unit, a speed closed-loop adjustment according to a current speed value fed back by the engine, so that a current speed of the engine is consistent with the target speed of the engine. Further aspects are an engine speed control system and a boom-type engineering machine equipped therewith.

主权项

1. A method of controlling engine speed, used to control an output speed of an engine of a boom-type engineering machine during a boom action, comprising:
(a) detecting a load pressure of a hydraulic system and a moving speed of a boom; (b) determining a target speed of the engine according to the load pressure and the moving speed of the boom, by a central control unit; (c) sending, by the central control unit, the target speed of the engine to an engine control unit; and (d) performing, by the engine control unit, a speed closed-loop adjustment according to a current speed value fed back by the engine, so that a current speed of the engine is consistent with the target speed of the engine,
wherein the step of determining the target speed of the engine according to the load pressure and the moving speed of the boom, by the central control unit, comprises:
calculating an engine initial control speed which matches the load pressure and the moving speed of the boom according to a power matching model and a flow matching model; anddetermining the target speed of the engine according to the engine initial control speed;wherein the moving speed of the boom is obtained by a push rod amplitude and a shift of a boom remote controller; andwherein the engine initial control speed, the load pressure, and the push rod amplitude meet the relationship of:
n=f(P,q,T0,T1, . . . Tn),  wherein
n is the engine initial control speed;P is the load pressure;q is a hydraulic pump displacement;T0 is the push rod amplitude corresponding to a rotating boom;T1 is a push rod amplitude corresponding to a first boom section; andTn is a push rod amplitude corresponding to an nth boom section.