JPS59157549U - fuel injection pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIGS. 1 to 6 show Embodiment 1. FIG. 1 is an overall sectional view of the fuel injection pump, FIG. A plan view of the actuator, FIGS. 4A to 4D are cross-sectional views of main parts explaining the operating state, FIGS. 5 and 6 are explanatory diagrams showing the advance characteristics of the injection timing, and FIGS. 7 to 9 are Embodiment 2 is shown, FIG. 7 is a schematic configuration diagram, FIG. 8 is a block diagram showing a modification of the control circuit, FIG. 9 is a flowchart of the control circuit in FIG. 7, and FIG. 10 is a diagram showing the third embodiment. FIG. '1...Feed pump, 3...Input shaft, 4...Curved fuel supply passage, 5...Pump chamber,
6...Regulator valve, 8...Cam, 9...Plunger, 10...Speed timer mechanism, 11...Timer piston, 1
2...Governor shaft, 15...Fly weight, 17...Governor sleeve, 24...
...Control sleeve, 25a...
Low-altitude fuel relief passage, 25b... High-altitude fuel relief passage, 26a... Low-altitude port, 26b...
...High altitude port, 27...Timing control sleeve, 28...Actuator, 29...Control circuit, 30...Barometric pressure sensor, 31... - Curved solenoid, 33... Actuator, 36... Timer piston, 43...
...Pressure control valve, 44...Control circuit, 5
8... Actuator, 61... Control circuit.

Claims (3)

[Scope of utility model registration request] (1) An injection timing variable device that changes the fuel injection timing;
An atmospheric pressure detection device detects atmospheric pressure, a load detection device detects the engine load state, and the injection timing is advanced in the advance direction when the atmospheric pressure is low and the load is low according to the output of the rain detection device. 1. A fuel injection system comprising: an injection timing control device that drives an injection timing variable device to retard the injection timing when under load. (2) The injection timing variable device is composed of a speed timer mechanism that controls the injection timing by fuel pressure according to the engine rotation speed, and the injection timing control device is configured with a low-altitude and high-altitude fuel relief passage formed in the governor shaft. , a governor sleeve that is fitted to the governor shaft and slides on the governor shaft in accordance with the fuel injection amount; a low-altitude port and a high-altitude port that are fitted to the governor sleeve; 2. The fuel injection pump according to claim 1, wherein the fuel injection pump is provided with a timing control sleeve that opens and closes ports for high altitude and high altitude use, and is configured to drive the timing control sleeve in accordance with the output of an atmospheric pressure detection device. (3) An actuator in which the injection timing variable device varies the injection timing by changing the phase between the input shaft of the fuel injection pump and a cam that drives the plunger, and a pressure control valve that controls the operating pressure acting on the actuator. The fuel according to claim 1, wherein the injection timing control device is configured to generate an output signal for driving the pressure control valve in response to signals from at least an atmospheric pressure detection device and a load detection device. injection pump.