Structural-parametrical synthesis of electronic control unit of fuel feeding system of vehicle diesel engine

Abstract

We draw a conclusion that in the fuel feed system of the transport diesel engine, it is expedient to use a two-channel electronic control unit. The selection of appropriate channel of the electronic control unit is done by the driver depending on road conditions. This scheme of electronic unit makes it possible to minimize both dynamic errors, which appear during motion of vehicle in the rough terrain, when there is a significant change in load within a short time interval, and the static errors, which appear when moving along the routes with high-quality road surface, but with lengthy ascends and descents. The proposed fuel feed system is in a certain sense universal. The channel, providing high dynamic accuracy of fuel feed control, contains ae sensor of angular velocity of crankshaft rotation of the diesel engine, and the sensors of position of fuel pump lath and the pedal of fuel feed control, the outputs of which are connected to inputs of the electronic unit, which implements a linear combination of the input signals of sensors. The channel that provides for invariance of the fuel feed system to the action of external disturbances realizes a control algorithm, which uses, in addition to the output signals of the above-indicated sensors, information about the displacement velocity of the fuel pump lath of the diesel engine. High accuracy and interference protection of the closed fuel feed system may be achieved by using a digital electronic control unit with the implementation of digital Butterworth and Lanczos low-frequency filters.