Electronically controlled injecting arrangements feeding fuel under constant pressure into internal combustion engines

Claim 2

In an electronically controlled fuel supply system for internal combustion engines comprising a common pipe feeding the fuel injectors with fuel under constant pressure, a fuel pump feeding said pipe, a variable speed electric motor for driving said pump, electronic control means for producing fuel injection signals in synchronism with the rotation of the engine and of variable duration according to the load on the engine, an improved electronic regulating means connected to the electronic control means for acting on the electric motor in response to the varied fuel injection signals to adjust its speed in conformity with the load and the rotary speed of the engine, said electronic regulating means comprising: a source of voltage for energizing the electric motor, a transistor having its collector-emitter circuit inserted between said voltage source and said electric motor, and means feeding the base of said transistor with pulses at a frequency which is that of the injection producing signals and of a duration which is a function of that of the injectionproducing signals, said pulses producing an average current passing through said collector-emitter circuit and causing the motor to turn at a speed corresponding to the integral of said pulses.

Claim 3

In an electronically controlled fuel supply system for internal combustion engines comprising a common fuel pipe feeding the fuel injectors with fuel under constant pressure, a fuel pump feeding said pipe, a variable speed electric motor for driving said pump, electronic control means for producing fuel injection signals in synchronism with the rotation of the engine and of variable duration according to the load on the engine, an improved electronic regulating means connected to the electronic control means for acting on the electric motor in response to the varied fuel injection signals to adjust its speed in conformity with the load and the rotary speed of the engine, said electronic regulating means comprising: a source of voltage for energizing the electric motor a transistor having its collector-emitter circuit inserted between said voltage source and said electric motor, means feeding the base of said transistor with pulses at a frequency which is that of the injection-producing signals and of a duration which is a function of that of the injection-producing signals, said pulses producing an average current passing through said collector-emitter circuit and causing the motor to turn at a speed corresponding to the integral of said pulses, and a resistance shunting said collector-emitter circuit, the value of said resistance defining the passage of a constant current which produces a slow basic rotation of the motor at a slow speed added to that speed produced by said average current.

Claim 4

In an electronically controlled fuel supply system for internal combustion engines comprising a common fuel pipe feeding the fuel injectors with fuel under constant pressure, a fuel pump feeding said pipe, a variable speed electric motor for driving said pump, electronic control means for producing fuel injection signals in synchronism with the rotation of the engine and of variable duration according to the load on the engine, an improved electronic regulating means connected to the electronic control means for acting on the electric motor in response to the varied fuel injection signals to adjust its speed in conformity with the load and the rotary speed of the engine, said electronic regulating means comprising: a source of voltage for energizing the electric motor a transistor having its collector-emitter circuit inserted between said voltage source and said electric motor, means feeding the base of said transistor with pulses at a frequency which is that of the injection-producing signals and of a duration which is a function of that of the injection-producing signals, said pulses producing an average current passing through said collector-emitter circuit and causing the motor to turn at a speed corresponding to the integral of said pulses, and a resistance shunting said collector-emitter circuit, the value of said resistance defining the passage of a constant current which produces a slow basic rotation of the motor at a slow speed added to that speed produced by said average current.

Claim 5

In an electronically contrOlled fuel supply system for internal combustion engines comprising a common pipe feeding the fuel injectors with fuel under constant pressure, a fuel pump feeding said pipe, a variable speed electric motor for driving said pump, electronic control means for producing fuel injection signals in synchronism with the rotation of the engine and of variable duration according to the load on the engine, an improved electronic regulating means connected to the electronic control means for acting on the electric motor in response to the varied fuel injection signals to adjust its speed in conformity with the load and the rotary speed of the engine, said electronic regulating means comprising: a source of voltage for energizing the electric motor, a transistor having its collector-emitter circuit inserted between said voltage source and said electric motor, means feeding the base of said transistor with pulses at a frequency which is that of the injection-producing signals and of a duration which is a function of that of the injection-producing signals, said pulses producing an average current passing through said collector-emitter circuit and causing the motor to turn at a speed corresponding to the integral of said pulses, and means operatively connecting the starter with said transistor for causing the transistor to conduct continuously during actuation of the starter to produce full speed rotation of the pump motor while the starter is actuated.

Claim 6

In an electronically contrOlled fuel supply system for internal combustion engines comprising a common pipe feeding the fuel injectors with fuel under constant pressure, a fuel pump feeding said pipe, a variable speed electric motor for driving said pump, electronic control means for producing fuel injection signals in synchronism with the rotation of the engine and of variable duration according to the load on the engine, an improved electronic regulating means connected to the electronic control means for acting on the electric motor in response to the varied fuel injection signals to adjust its speed in conformity with the load and the rotary speed of the engine, said electronic regulating means comprising: a source of voltage for energizing the electric motor, a transistor having its collector-emitter circuit inserted between said voltage source and said electric motor, means feeding the base of said transistor with pulses at a frequency which is that of the injection-producing signals and of a duration which is a function of that of the injection-producing signals, said pulses producing an average current passing through said collector-emitter circuit and causing the motor to turn at a speed corresponding to the integral of said pulses, and means operatively connecting the starter with said transistor for causing the transistor to conduct continuously during actuation of the starter to produce full speed rotation of the pump motor while the starter is actuated.

Claim 7

A system as claimed in claim 1 wherein the electronic regulating means include an additional transistor, means feeding the base of said additional transistor with pulses at a frequency which is that of the injection producing signals, a program-controlled unijunction transistor, a resistance in series therewith inserted between the source of voltage and ground, a potentiometer inserted between the source of voltage and ground and a point of which is connected with the control electrode of the unijunction transistor, a condenser grounding the anode of the unijunction transistor, a connection between last-mentioned anode and ground and in which the collector-emitter circuit of the further transistor is inserted, a still further transistor base having its base connected with the cathode of the unijunction transistor, the emitter of which is grounded, an additional resistance connecting the collector of said still further transistor with the source of voltage and a connection between the last-mentioned collector and the base of the first-mentioned transistor, to feed the latter with pulses at a frequency which is that of the injection-producing signals and of a duration which is equal to that of said signals with the addition of the duration of discharging of the condenser and of the time constant defined by the condenser circuit.

Claim 8

A system as claimed in claim 1 wherein the electronic regulating means include an additional transistor having its collector-emitter circuit inserted between the source of voltage and ground, a resistance and a diode in series inserted between the signal generator and the base of said further transistor, an additional resistance between the emitter of said additional transistor and ground, means connecting the last-mentioned emitter with the base of the first-mentioned transistor to feed said base with pulses at a frequency which is that of the injection-producing signals and of a duration which is a function of that of said signals, and including a still further transistor the collector of which is connected with the base of the further transistor and the emitter of which is grounded, a still further resistance and a condenser inserted in series between the base of the further transistor and the point connecting said diode with the cooperating first-mentioned resistance, and a further diode and fourth resistance grounding the corresponding terminals of the condenser respectively, the duration of loading of said condenser delaying the application of the pulses to the base of the first-mentioNed transistor.