Correction method for output value of flow control model of high-pressure pump of oil rail

Abstract

The invention discloses a correction method for an output value of a flow control model of a high-pressure pump of an oil rail. The correction method comprises the following steps: correction formula construction parameters are stored in a data storage module of an engine, when a control system of the engine is powered on, the correction formula construction parameters are read from the data storage module of the engine, a calculation formula for a correction value of an open-loop flow model is constructed according to the correction formula construction parameters, in the operation process of the engine, the correction value of the open-loop flow model is calculated according to the formula, the correction value is used for correcting an output value of the open-loop flow model, and in the operation process of the engine, the correction formula construction parameters are periodically updated in a self-learning mode; and when the control system of the engine is powered off, the finally updated correction formula construction parameters are stored in the data storage module of the engine. According to the correction method, the influence of the deviation of an output current of a fuel metering valve on the flow control precision of the high-pressure pump of the oil rail is avoided, and the flow control over the high-pressure pump of the oil rail is more accurate.

Description

technical field [0001] The invention relates to a rail pressure control technology of an automobile engine oil rail, in particular to a method for correcting an output value of an oil rail high-pressure pump flow control model. Background technique [0002] In existing fuel engines, fuel distributors have been generally used to supply oil to engine cylinders. The fuel distributor is referred to as the fuel rail. It is an integral part of the air / fuel subsystem in the electronically controlled fuel injection system. Its main function is to ensure that sufficient fuel flow is provided and evenly distributed to the injectors of each cylinder of the engine. A common method of rail pressure control in the fuel rail is to control the flow rate of the high-pressure pump in the fuel rail, and the flow rate of the high-pressure pump in the fuel rail is usually controlled by the fuel metering valve according to the duty ratio signal. [0003] see figure 1 , taking a certain type of ...

AI Technical Summary

Problems solved by technology

Generally speaking, the open-loop flow model used by the same type of engine is the same, and its model algorithm is standard, that is to say, the algorithm of the open-loop flow model is the default standard fuel metering valve output current, if the fuel metering valve If the deviation of the output current is too large, the flow control value output by the open-loop flow model will have a large deviation in the control signal output to the fuel rail high-pressure pump after passing through the fuel metering valve, and even the fuel rail pressure overshoot will occur. phenomenon, which leads to the overflow valve on the oil rail being flushed open, which in turn leads to the adverse consequences of rail pressure out of control and abnormal fuel injection

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