Device for controlling the ignition and fuel injection of an internal combustion engine

Claim 1

A device for controlling the ignition and fuel injection of an internal combustion engine having an intake manifold, a crankshaft, plural pistons coupled to the crankshaft, a fuel injector, and an ignition coil, comprising: a target fixedly rotating with the crankshaft, said target having a periphery provided with a series of teeth and hollows, at least one tooth of which has been eliminated to define a predetermined absolute reference; a single angular position sensor associated with said target; a sensor for measuring pressure in said intake manifold of the engine; a computation system in which are stored predetermined values of angle of advance and injection time addressable as a function of the parameters of engine speed and pressure in the intake manifold, said computation system comprising, sensor processing means for producing from an output signal of the position sensor a synchronization signal (Sy) identifying the passage of each piston by a predetermined position and for computing engine speed, a first microcomputer connected to the pressure sensor and controlling the injector, and a second microcomputer connected to the position sensor and controlling the ignition coil, the second microcomputer being a dedicated ignition computer for processing said synchronization signal (Sy), an image signal (Sd) of the teeth of the target and a frequency speed signal (V) n times greater than that of the image signal (Sd) from the output signal of the position sensor, said second microcomputer including read only memory means for storing factors of correction for advance, for full load advance, and for predetermined additional inputs for correction of advance, said read only memory means of the second microcomputer containing a zero value, said first microcomputer including means for storing the values for the angle of advance and injection time, means for receiving the synchronization signal (Sy), means for computing the engine speed and angle of advance and for applying a value of the angle of advance to the predetermined additional inputs of the second microcomputer, said second microcomputer including means for computing the conduction angle of the coil as a function of said signals processed from the output signal of the sensor processing means, and means for controlling the conduction of said coil according to the computed angles of conduction and ignition advance.

Claim 2

A device for controlling the ignition and fuel injection of an internal combustion engine having an intake manifold, a crankshaft, plural pistons coupled to the crankshaft, a fuel injector, and an ignition coil, comprising: a target fixedly rotating with the crankshaft, said target having a periphery provided with a series of teeth and hollows, at least one tooth of which has been eliminated to define a predetermined absolute reference; a single angular position sensor associated with said target; a sensor for measuring pressure in said intake manifold of the engine; a computation system in which are stored predetermined values of angle of advance and injection time addressable as a function of the parameters of engine speed and pressure in the intake manifold, said computation system comprising, sensor processing means for producing from an output signal of the position sensor a synchronization signal (Sy) identifying the passage of each piston by a predetermined position and for computing engine speed, a first microcomputer connected to the pressure sensor and controlling the injector, and a second microcomputer connected to the position sensor and controlling the ignition coil, the second microcomputer being a dedicated ignition computer for processing said synchronization signal (Sy), an image signal (Sd) of the teeth of the target and a frequency speed signal (V) n times greater than that of the image signal (Sd) from the output signal of the position sensor, said second microcomputer including read only memory means for storing factors of correction for advance, for full load advance, and for predetermined additional inputs for correction of advance, said read only memory means of the second microcomputer containing a zero value, said first microcomputer including means for storing the values for the angle of advance and injection time, means for receiving the synchronization signal (Sy), means for computing the engine speed and angle of advance and for applying a value of the angle of advance to the predetermined additional inputs of the second microcomputer, said second microcomputer including means for computing the conduction angle of the coil as a function of said signals processed from the output signal of the sensor processing means, and means for controlling the conduction of said coil according to the computed angles of conduction and ignition advance.