Smoke intensity control method for small excavator

Abstract

The invention discloses a smoke intensity control method for a small excavator, and belongs to the field of smoke intensity control methods. The smoke intensity control method comprises the followingsteps that a whole machine controller VECU collects a pressure value of an LS port or a hydraulic pump on a main valve, the whole machine controller VECU compares the collected pressure value with a system set trigger value, and whether the collected pressure value exceeds the system set trigger value or not is determined; if the collected pressure value exceeds the system set value, the whole machine controller VECU sends a load signal to an engine controller EECU; after receiving the load signal, the engine EECU transmits a set current signal to an electronic speed regulator; and the electronic speed regulator of an engine controls retention and recovery time of a rack of a fuel injection pump according to the received current signal, so that the fuel injection moment of the engine is delayed. The smoke intensity control method for the small excavator can meet the requirements of laws and regulations, the cost of the whole engine is basically not changed, and meanwhile the problem that the performance of the whole engine becomes poor due to the fact that the pump power is greatly reduced in an original design scheme is solved.

Description

technical field [0001] The invention belongs to a smoke control method, in particular to a small excavator smoke control method. Background technique [0002] At present, most of the engines used in small excavators are mechanical engines, not electronically controlled engines. The electronically controlled engine can precisely adjust the fuel injection time and control the fuel injection quantity through the engine electronic control ECU, so that the engine can always work within the restricted area of ​​black smoke. The mechanical engines used in small excavators now meet the emission requirements by adding electronic governors and electric controllers. However, with the implementation of smoke limit regulations, this engine cannot accurately control the fuel injection amount according to the load. When the load increases or changes suddenly, the fuel injection pump of the engine will increase the fuel injection volume in order to meet the load demand, so the problem of e...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for controlling the smoke level of a small excavator, so as to overcome the obvious decline in the operating efficiency of the whole machine caused by reducing the power of the hydraulic pump to reduce the black smoke when the small and medium-sized excavators in the prior art solve the problem of excessive black smoke, which affects the whole machine. Defects in machine performance

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