Electronic control for the air-fuel mixture and for the ignition of an internal combustion engine

Claim 2

An electronic system for controlling the air-fuel mixture in an internal combustion engine having an accelerator, at least one cylinder and a throttle valve, first means for providing a first signal corresponding to the position of the accelerator and a second signal corresponding to the engine rpm; second means including an electronic function generator having input means connected to receive said first and second signals for controlling the amount of fuel supplied to the cylinder so as to obtain a desired excess air coefficient alpha for each operating condition of the engine, and said second means further including means for controlling the position of the throttle valve comprising an amplifier having an input connected to receive said first signal, and a Zener diode connected between ground and said input of said amplifier to become conductive when said accelerator is greatly depressed so that the throttle valve is completely opened before the accelerator is moved to its maximum position.

Claim 3

An electronic system for controlling the air-fuel mixture in an internal combustion engine having a throttle valve, an accelerator and at least one cylinder comprising, in combination first means comprising a first transducer for providing a first signal corresponding to the position of the accelerator and a second transducer for providing a second signal corresponding to the engine rpm; second means connected to receive said signals as input for controlling, in dependence upon said signals, the amount of fuel supplied to an engine cylinder so as to obtain a desired excess air coefficient alpha for each operating condition of the engine, said second means including an electronic function generator for selecting the ignition timing in dependence upon said signals, said function generator including an electronic multiplier having first and second inputs respectively connected to receive said first and second signals, said second means further including ignition timing setting means for adjusting the ignition timing, a first control circuit having an input connected to receive said first and second signals and an output connected to said ignition timing setting means to control the latter in dependence upon said signals, and wherein said second means further includes throttle-valve setting means for adjusting the throttle-valve position and a second control circuit having an input connected to said transducers to receive said signals and having an output connected to said throttle-valve setting means to control the latter in dependence upon said signals.

Claim 4

An electronic system for controlling the air-fuel mixture in an internal combustion engine having a throttle valve, an accelerator and at least one cylinder comprising, in combination first means comprising a first transducer for providing a first signal corresponding to the position of the accelerator and a second transducer for providing a second signal corresponding to the engine rpm; second means connected to receive said signals as input for controlling, in dependence upon said signals, the amount of fuel supplied to an engine cylinder so as to obtain a desired excess air coefficient alpha for each operating condition of the engine, said second means including an electronic function generator for selecting the ignition timing in dependence upon said signals, said function generator including an electronic multiplier having first and second inputs respectively connected to receive said first and second signals, said second means further including ignition timing setting means for adjusting the ignition timing, a first control circuit having an input connected to receive said first and second signals and an output connected to said ignition timing setting means to control the latter in dependence upon said signals, and wherein said second means further includes throttle-valve setting means for adjusting the throttle-valve position and a second control circuit having an input connected to said transducers to receive said signals and having an output connected to said throttle-valve setting means to control the latter in dependence upon said signals.

Claim 5

A system as defined in claim 1, wherein said second means includes means for providing a rich mixture only at full load operation and at operation at low engine rpm and small load.

Claim 6

A system as defined in claim 1, wherein said first means provide a third signal corresponding to the amount of air passing through the intake manifold, and wherein said function generator input means is connected to receive said third signal.

Claim 7

A system aS defined in claim 4, wherein said first means includes a static plate for measuring the amount of air passing through said intake manifold, and first transducer means for converting the movements of said static plate into said third electrical signal.

Claim 8

A system as defined in claim 4, wherein said first means includes temperature dependent resistance means located in the intake manifold air flow for providing a temperature dependent resistance, and transducer means connected to said resistance means for converting the temperature dependency thereof into said third signal.

Claim 9

A system as defined in claim 1, wherein said first means provides a third signal corresponding to the air temperature, a fourth signal corresponding to the air pressure, and a fifth signal corresponding to the engine temperature, and means for connecting said input means of said function generator to said third, fourth, and fifth signals.

Claim 10

A system as defined in claim 2, wherein said second means includes dosing valve means for controlling the amount of fuel fed to the cylinder, and an electronic function generator connected to said dosing valve means to regulate the latter in dependence on said engine operating parameters.

Claim 11

A system as defined in claim 2, wherein said second means includes fuel injection valve means for controlling the amount of fuel fed to the cylinder, and an electronic function generator connected to said fuel injection valve means to regulate the open time of the latter in dependence on said engine operating parameters.

Claim 12

A system as defined in claim 1, wherein said second means includes metering means for controlling the flow of fuel to the cylinder, and control means for setting said ignition timing, said metering means, and the throttle valve.

Claim 13

A system as defined in claim 10, wherein said control means includes servo loop means and feedback means for feeding back said operating parameters as an actual value in said servo loop means.

Claim 14

A system as defined in claim 1, including a further differential amplifier for controlling the amount of fuel supplied to the cylinder, said function generator including an electronic multiplier having first and second inputs and an output, said output being connected to the input of said further differential amplifier, said first input being connected to receive said first signal, and wherein said first means includes a further transducer for providing said second signal, and further including rectifying means having an input and an output, said input being connected to receive said second signal and said output being connected to said second input of said multiplier.

Claim 15

A system as defined in claim 12, further including resistance-diode network means connected to said first input of said multiplier for providing a non-linear function.

Claim 16

A system as defined in claim 2, further including a first resistor and a second control amplifier connected in parallel between the output of said first transducer and said input of said first control amplifier.

Claim 17

A system as defined in claim 14, including a negative feedback circuit connected between the input and output of said second control amplifier, said feedback circuit including a diode and a resistor connected in parallel.

Claim 18

A system as defined in claim 2, including a negative feedback circuit connected between said input and output of said first control amplifier, said feedback circuit including a Zener diode and a resistor connected in parallel.

Claim 19

A system as defined in claim 2, including a Zener diode connected between said output and said first input of said multiplier.

Claim 20

A system as defined in claim 14, wherein said first multiplier input is connected to a first constant bias voltage and the input of said second control amplifier is connected to a second constant bias voltage.