US4890593A — Fuel injection control system for an internal com…

Claim 1

Independent Claim 194 words

A fuel injection system for an internal combustion engine of the type having an intake manifold, a rotary output shaft and at least one fuel injector, said at least one injector having a valve which, when open, enables the injection of fuel into a combustion chamber for the engine, said fuel injection system comprising: means located proximate to and associated with said shaft for producing at least one pulse per revolution of said shaft at a predetermined rotational position of said shaft, means for measuring the pressure in the manifold and for providing a pressure output signal, means for opening said valve in synchronism with said pulse, means responsive to said pressure signal for generating a VALVE OPEN signal having a duration during a cruising condition solely proportional to said pressure signal, said VALVE OPEN signal being operable to open said at least one valve during the duration of said VALVE OPEN signal, wherein the fuel injection is initiated at the same rotational position of the rotary output shaft and wherein the termination of the fuel injection per rotation of the shaft is varied to vary the amount of fuel injected into the engine.

Claim 2

Dependent Claim 194 words

A fuel injection system for an internal combustion engine of the type having an intake manifold, a rotary output shaft and at least one fuel injector, said at least one injector having a valve which, when open, enables the injection of fuel into a combustion chamber for the engine, said fuel injection system comprising: means located proximate to and associated with said shaft for producing at least one pulse per revolution of said shaft at a predetermined rotational position of said shaft, means for measuring the pressure in the manifold and for providing a pressure output signal, means for opening said valve in synchronism with said pulse, means responsive to said pressure signal for generating a VALVE OPEN signal having a duration during a cruising condition solely proportional to said pressure signal, said VALVE OPEN signal being operable to open said at least one valve during the duration of said VALVE OPEN signal, wherein the fuel injection is initiated at the same rotational position of the rotary output shaft and wherein the termination of the fuel injection per rotation of the shaft is varied to vary the amount of fuel injected into the engine.

Claim 3

Dependent Claim 50 words

The invention as defined in claim 1 wherein said means for producing said at least one pulse comprises means for producing a plurality of pulses per revolution of said shaft, said fuel injection system further comprising: means for producing a VALVE OPEN signal during each pulse when starting the engine.

Claim 4

Dependent Claim 45 words

The invention as defined in claim 2 and comprising means for generating a temperature signal representative of the cylinder head temperature of the engine during engine starting, and means for modifying the duration of said VALVE OPEN signal as a function of said temperature signal.

Claim 5

Dependent Claim 80 words

The invention as defined in claim 3 wherein said modifying means multiplies the duration of said pulses by a multiplication factor substantially as set in the following table: ______________________________________ 160 1.0 1.0 1.0 1.0 1.0 120 1.1 1.0 1.0 1.0 1.0 Cylinder Head 80 1.2 1.1 1.1 1.0 1.0 Multiplication Temperature ° F. Factor 40 1.5 1.3 1.2 1.1 1.0 0 2 0 1.7 1.3 1.1 1.0 0 1 2 3 4 Time Since Engine was Last Started (Minutes) ______________________________________

Claim 6

Dependent Claim 38 words

The invention as defined in claim 1 and comprising means for generating a temperature signal representative of the cylinder head temperature and for modifying the duration of the VALVE OPEN signal as a function of said temperature signal.

Claim 7

Dependent Claim 50 words

The invention as defined in claim 5 wherein said modifying means multiplies the duration of said VALVE OPEN signal by a multiplication factor substantially as set forth in the following table: ______________________________________ Cylinder Head Temperature ° F. Multiplier ______________________________________ 480 1.4 460 1.3 440 1.2 420 1.1 400 1.0 ______________________________________

Claim 8

Dependent Claim 64 words

The invention as defined in claim 1 and comprising: means for generating an exhaust temperature signal representative of the exhaust gas temperature from the engine, means for periodically reducing the duration of said VALVE OPEN signal by a preset amount until the exhaust gas temperature signal decreases, and means for thereafter increasing the duration of the valve open signal by a second predetermined amount.

Claim 9

Dependent Claim 72 words

The invention as defined in claim 1 wherein said VALVE OPEN accordance with the following table: ______________________________________ 40 12.8 12.9 13.0 13.1 13.3 16.6 33 10.5 10.7 11.0 11.1 11.4 11.9 Manifold 27 7.7 8.0 8.2 8.4 8.5 8.6 Milli- Pressure seconds 20 4.8 5.0 5.3 5.3 5.3 5.5 13 3.2 3.4 3.6 3.8 4.0 4.2 1 0 0 0 0 0 0 450 900 1400 1800 2300 2700 Engine RPM ______________________________________

Claim 10

Dependent Claim 154 words

A fuel injection system for an internal combustion engine of the type having an intake manifold, a rotary output shaft, and at least one fuel injector, said at least one injector having a valve which, when open, enables the injection of fuel into a combustion chamber for the engine, said fuel injection system comprising: a magneto located proximate said shaft for producing at least one pulse per revolution of said shaft at a predetermined rotational position of said shaft, means for measuring the pressure in the manifold and for providing a pressure output signal, means for opening said valve in synchronism with said pulse, means responsive to said pressure signal for generating a valve open signal having a duration proportional to said pressure signal, said valve open signal being operable to control the length of time said valve shall be open in response to the opening of said valve by said means for opening.

Claim 11

Dependent Claim 154 words

A fuel injection system for an internal combustion engine of the type having an intake manifold, a rotary output shaft, and at least one fuel injector, said at least one injector having a valve which, when open, enables the injection of fuel into a combustion chamber for the engine, said fuel injection system comprising: a magneto located proximate said shaft for producing at least one pulse per revolution of said shaft at a predetermined rotational position of said shaft, means for measuring the pressure in the manifold and for providing a pressure output signal, means for opening said valve in synchronism with said pulse, means responsive to said pressure signal for generating a valve open signal having a duration proportional to said pressure signal, said valve open signal being operable to control the length of time said valve shall be open in response to the opening of said valve by said means for opening.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-01-01	1993-07-03	1994-01-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-01-01	1997-07-03	1998-01-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-01-01	2001-07-03	2002-01-02	$7700.00	Window Closed / Lapsed

Fuel injection control system for an internal combustion engine

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