Electronically controlled high-pressure oil pump and detection device and method for reverse connection of its interface

Abstract

The invention provides an electronically controlled high-pressure oil pump and a detection device and method for reverse connection of its interface, which can quickly and accurately detect whether the connection of the interface is reversed. The detection method includes: detecting whether the pressure limiting valve of the common rail pipe is open, and if so, obtaining the duty ratio of the oil quantity metering unit and the rail pressure of the common rail pipe, and judging whether the two are proportional, and if so, issuing The interface is reversed signal. The detection device includes a controller and an acquisition device connected to the signal, and the acquisition device is used to obtain the duty ratio of the fuel metering unit and the rail pressure of the common rail pipe, and judge the relationship between the two changes; the controller and the common rail pipe The signal of the pressure limiting valve is connected, and the acquisition device is controlled to work when the pressure limiting valve is opened; when the acquisition device obtains that the duty cycle is proportional to the rail pressure, the controller sends a signal that the interface is reversed. The invention utilizes the characteristic that the duty ratio is proportional to the rail pressure when the interface of the electronically controlled high-pressure oil pump is reversed, and the operation is simple and convenient, and the detection accuracy is high.

Description

technical field [0001] The invention relates to the technical field of diesel engines, in particular to a detection method for reverse connection of an interface of an electronically controlled high-pressure oil pump. The present invention also relates to a detection device using the above detection method, and an electronically controlled high-pressure oil pump with the above detection device. Background technique [0002] The electronically controlled high-pressure common rail system means that the diesel oil is sucked out from the fuel tank by the gear pump, delivered to the diesel fine filter through the oil-water separator and the gear pump, and then delivered to the common rail pipe through the electronically controlled high-pressure oil pump, and then conveyed by the common rail pipe The entire oil circuit system to the fuel injector, as well as the closed-loop fuel supply system composed of sensors and ECU (Electronic Control Unit), is a fuel supply method that compl...

AI Technical Summary

Problems solved by technology

[0008] In actual production, for the convenience of processing and assembly, the interface sizes of the inlet and outlet ports of the electronically controlled high-pressure oil pump are the same, so assembly errors are prone to occur; when assembly errors occur, the rail pressure may rise sharply, thereby opening the pressure limiting valve 51 ', affecting the normal use of the common rail pipe 5' and destroying the stability of the entire oil supply system

Images