Fuel injecting electronic unit pump of single-cylinder diesel engine

Abstract

The invention discloses a fuel injecting electronic unit pump of a single-cylinder diesel engine. The fuel injecting electronic unit pump comprises a guiding sleeve and an electronic control pump part. An axial electronic control pump part installing hole is formed in the guiding sleeve, a fuel feeding hole and a pressure stabilizing hole are formed in the sleeve wall of the guiding sleeve, and the lower portion of the guiding sleeve is connected with a holding body part through an elastic clamp ring and a guiding block. A plunger valve of the electronic control pump part is partly inserted into the electronic control pump part installing hole and fixedly connected with the guiding sleeve through a fastener. An annular fuel feeding groove in the electronic control pump part is aligned with the fuel feeding hole and the pressure stabilizing hole. A fuel feeding screw installed in the fuel feeding hole is connected with a fuel feeding pipe of the diesel engine, and a pressure stabilizing valve part installed in the pressure stabilizing hole is connected with a fuel returning pipe of the diesel engine. The fuel injecting electronic unit pump is directly installed on a gear chamber cover of a cylinder body of the single-cylinder engine and driven by a camshaft of a fuel pump to feed fuel, and under the condition that the engine is not greatly modified, it is achieved that the emission level of an existing diesel engine with a mechanical in-line pump is upgraded from the level of the non-road second-stage national standard to the level of the non-road third-stage national standard or the level of a higher standard.

Description

Technical field [0001] The invention relates to the technical field of diesel engine fuel injection electronic control unit pumps, and in particular to a single cylinder diesel engine fuel injection electronic control unit pump. Background technique [0002] On May 16, 2014, the Ministry of Environmental Protection of the People's Republic of China officially promulgated the "Emission Limits and Measurement Methods of Diesel Engine Exhaust Pollutants for Non-road Mobile Machinery" (China's third and fourth phases). Since October 1, 2014, All diesel engines for non-road mobile machinery that undergo the type approval of exhaust pollutants must meet the requirements of the third stage. Before the implementation date of this regulation, the application and approval for type approval can be made in accordance with the corresponding requirements of the standard. For diesel engines for non-road mobile machinery that have been type-approved in accordance with the standards, the inspect...

AI Technical Summary

Problems solved by technology

[0003] At present, the single-cylinder diesel engine fuel injection pumps in the prior art are all mechanically controlled, and the fuel injection quantity and fuel injection timing are controlled by mechanical devices such as shift forks and plunger grooves. The control accuracy and control flexibility are low, and the control range is narrow. Only a few operating points can be controlled, and precise control cannot be performed in all operating conditions; the injection pressure is low, and the pump end pressure of the fuel injection pump is usually lower than 500bar, and is limited by the structure and principle, such as various straight grooves on the plunger, The chute increases the leakage, reduces the strength and rigidity, and it is difficult to increase the pump end pressure above 600bar

Due to these deficiencies, it is difficult for mechanically controlled high-pressure fuel injection pumps to meet non-road national III and above emission standards

Moreover, the existing electronically controlled unit pumps for vehicles cannot be directly applied to single-cylinder diesel engines due to factors such as inappropriate oil inlet and return structures, split support bodies, and inconvenient installation of the shape, so electronically controlled unit pumps for vehicles cannot be used in single-cylinder diesel engines. direct application on cylinder diesel engine fuel injection system

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