초록

A digital controller for fuel injection of internal combustion engines comprising a logic signal shaping circuit; an analog data acquisition circuit; a microcomputer incorporating a clock and memories; a circuit controlling injector opening timer and a second control circuit for accessories.

대표청구항 ▼

A digital electronic controller for controlling the duration of fuel injection for an internal combustion engine comprising: a programmed microcomputer; a data acquisition system associated with the microcomputer; a shaping circuit serving as an interface between signal inputs and the microcomputer;

A digital electronic controller for controlling the duration of fuel injection for an internal combustion engine comprising: a programmed microcomputer; a data acquisition system associated with the microcomputer; a shaping circuit serving as an interface between signal inputs and the microcomputer; a driver for electrovalves associated with injectors of the internal combustion engine; an amplifier connected to the output of the microcomputer as a driver circuit for accessories; first bus means connected to the shaping circuit, the data acquisition system, the microcomputer and the electrovalve driver for carrying control signals between the shaping circuit, the data acquisition system, the microcomputer and the electrovalve driver; second bus means connected to the data acquisition system, the microcomputer and the electrovalve driver for carrying data between the data acquisition system, the microcomputer and the electrovalve driver; wherein when the microcomputer receives an interrupt pulse (INT) generated by the shaping circuit when a cylinder of the internal combustion engine is fired, it stops in its program and examines its inputs to determine the row of the cylinder fired and activates the corresponding injector, and the calculation sequence of the program in the microcomputer extends over several cycles, i.e. during the sequence several pulses (INT) are generated; the microcomputer and the data acquisition system including means for measuring, during a first phase the air supply (Ma) to the motor by counting between two successive interrupt pulses; and means for measuring during a second phase the temperature of the motor cylinder head and a reference voltage alternately, the air supply and temperature measurements being alternated; and wherein said microcomputer determines the optimum duration of the opening of said injectors by multiplying said air supply measurement (Ma) successively by a richness factor, a coefficient corresponding to the operating conditions of the internal combustion engine calculated by said microcomputer from said temperature measurement and said signal inputs, and by a correction coefficient for input gain obtained from said reference voltage measurement.