Output flow rate controlling method of pressure-storage type fuel jet device and the fuel jet device

Abstract

An accumulator fuel injector arranged such that fuel in a fuel tank (4) is supplied through first and second flow rate regulation valves (8a, 8b) to a supply pump (6) as a high-pressure pump, high-pressure fuel is pressure-fed to a common rail (2) by means of the supply pump (6), and the high-pressure fuel stored in the common rail (2) can be injected by means of a fuel injection valve (1). More specifically, the first and second flow rate regulation valves (8a, 8b) have different quantities of passable fuel and an electronic control section(5) can bring only one of them into operating state as required so that supply pumps (6) of various delivery volumes can be dealt with.

Description

technical field [0001] The present invention relates to a so-called accumulator-type fuel injection device, and more particularly to an accumulator-type fuel injection device with improved discharge rate control characteristics and the like. Background technique [0002] In the past, as such a device, for example, as disclosed in Japanese Patent Publication No. 8-284722, etc., the fuel pumped from the fuel tank by a fuel pump is supplied to a common rail connected with a plurality of nozzles through a high-pressure pump, and electronically A structure in which high-pressure fuel can be supplied to a fuel chamber of each cylinder of a diesel engine by controlling the nozzle to be opened is known. [0003] In such an accumulator type fuel injection device, as a measure to control the discharge amount, a method of adjusting the amount of fuel supplied to the plunger chamber of the high-pressure pump is provided on the inlet side. Between the plug chamber and the fuel pump, var...

AI Technical Summary

Problems solved by technology

[0005] However, an increase in the capacity of the high-pressure pump obviously leads to an increase in the amount of fuel passing through the flow regulating valve, so it is necessary to increase the opening area of ​​the flow regulating valve, resulting in an increase in the size of the flow regulating valve

In addition, the increase in the size of the flow control valve makes it more difficult to ensure the installation space in the device, which not only leads to difficulties in the structure of the device, but also causes problems such as high cost of the device and hinders the common use of components that are not related to the discharge amount.

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