Electronic fuel injection control system
First Claim
1. An electronic system for controlling fuel injection into the cylinders of an internal combustion engine comprising:
- timing signal generator means for generating a series of pulses in sequence, the leading edge of each of said pulses corresponding to the opening of the intake valve of one of the engine cylinders respectively,means for generating a digital pulse count signal which varies with preselected engine parameters comprising means for generating a voltage having a magnitude inversely proportional to intake manifold vacuum, means for generating a voltage having a magnitude inversely proportional to engine temperature means for summing said voltages to provide a single analog signal, analog/digital converter means for converting said analog signal to a digital signal, and storage means for storing said digital signal, said analog/digital converter means including means for periodically generating an updated digital signal in accordance with a more current value of the analog signal and providing said updated signal to said storage means, andcontrol signal generator means responsive to the outputs of said timing signal generator means and said storage means for generating a pulse signal for controlling the fuel injection for each of the cylinders, each of said pulse signals having a leading edge which corresponds to the leading edge of a respective one of the pulse outputs of the timing signal generator means and a duration in accordance with said digital signal pulse count.
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Abstract
A timing signal generator operates in response to engine position sensors to generate pulse signals in sequence, the leading edge of each of said pulses essentially coinciding with the valve opening time of an associated one of the cylinders of an internal combustion engine. The outputs of the timing signal generator are fed to a control signal generator which generates a series of pulses, one for each of the engine cylinders, the leading edges of these pulses each approximately coinciding with the leading edge of a corresponding one of the timing signal generator outputs. The pulse widths of the outputs of the control signal generator, which are controlled in accordance with various engine parameters, are indicative of engine fuel requirements for optimum engine efficiency and/or minimum emission of pollutants. The pulse signal outputs of the control signal generator are each used to control a respective one of the fuel injectors for the engine to provide fuel to each of the cylinders at the proper time and for a time duration which is precisely in accordance with engine requirements.
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Citations
26 Claims
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1. An electronic system for controlling fuel injection into the cylinders of an internal combustion engine comprising:
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timing signal generator means for generating a series of pulses in sequence, the leading edge of each of said pulses corresponding to the opening of the intake valve of one of the engine cylinders respectively, means for generating a digital pulse count signal which varies with preselected engine parameters comprising means for generating a voltage having a magnitude inversely proportional to intake manifold vacuum, means for generating a voltage having a magnitude inversely proportional to engine temperature means for summing said voltages to provide a single analog signal, analog/digital converter means for converting said analog signal to a digital signal, and storage means for storing said digital signal, said analog/digital converter means including means for periodically generating an updated digital signal in accordance with a more current value of the analog signal and providing said updated signal to said storage means, and control signal generator means responsive to the outputs of said timing signal generator means and said storage means for generating a pulse signal for controlling the fuel injection for each of the cylinders, each of said pulse signals having a leading edge which corresponds to the leading edge of a respective one of the pulse outputs of the timing signal generator means and a duration in accordance with said digital signal pulse count. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In an internal combustion engine having a fuel injector for injecting fuel into each of the cylinders thereof, means for generating a pulse control signal for controlling the operation of each of said fuel injectors comprising:
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a timing signal generator comprising means for sensing the ignition spark for each of said cylinders and generating a series of pulses in accordance therewith, sequencer means for providing pulses on separate lines in sequence in response to said series of pulses, means for synchronizing the operation of said sequencer means whereby the output on each of said lines corresponds with the opening of the intake valve of a separate one of said cylinders, means for generating an analog signal inversely proportional to engine intake manifold vacuum, means for generating an analog signal inversely proportional to engine temperature, means for summing said analog signals to provide a single analog signal, analog/digital converter means for converting said single analog signal to a digital signal, storage means for storing said digital signal, said analog/digital converter means including means for periodically generating an updated digital signal in accordance with a more current value of the analog signal and providing said updated signal to said storage means, and control signal generator means responsive to the outputs of said timing signal generator means and said storage means for generating said pulse control signals, said pulse control signals having leading edges corresponding to the opening time of each of the cylinder intake valves and pulse widths in accordance with said digital signal, for establishing the duration of the valve opening times. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An electronic system for controlling fuel injection into the cylinders of an internal combustion engine, comprising:
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timing signal generator means for generating a series of pulses in sequence, the leading edge of each of said pulses corresponding to the opening of the intake valve of one of the engine cylinders respectively, said timing signal generator means comprising a digital sequencer, means responsive to the engine ignition for generating a series of pulses coincidental with the firing time of each of said cylinders for driving said sequencer, means responsive to the rotation of the engine distributor for generating pulses for resetting the sequencer to identify the pulse output thereof with each of the engine cylinders, means for generating a series of pulses in accordance with actuation of the engine throttle, and means for coupling said series of pulses to said sequencer prior to the starting of the engine for use in priming said engine, means for generating a digital pulse count signal which varies with preselected engine parameters comprising analog data generator means for generating a voltage representing predetermined optimum fuel injection time durations for said engine, said voltage being inversely proportional to intake manifold vacuum and engine temperature and means for converting said voltage to said digital pulse count signal, and control signal generator means responsive to the outputs of said timing signal generator means and said digital signal for generating a pulse signal for controlling the fuel injection for each of the cylinders, each of said pulse signals having a leading edge which corresponds to the leading edge of a respective one of the pulse outputs of the timing signal generator means and a duration in accordance with said digital signal pulse count.
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26. In an internal combustion engine having a fuel injector for injecting fuel into each of the cylinders thereof, means for generating a pulse control signal for controlling the operation of each of said fuel injectors comprising:
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a timing signal generator comprising means for sensing the ignition spark for each of said cylinders and generating a series of pulses in accordance therewith, sequencer means for providing pulses on separate lines in sequence in response to said series of pulses, means for synchronizing the operation of said sequencer means whereby the output on each of said lines corresponds with the opening of the intake valve of a separate one of said cylinders, means for priming the engine comprising means for generating a pulse train in response to movement of the engine throttle and gating means for feeding said pulse train to said sequencer means as a drive signal therefor prior to the starting of the engine, means for generating an analog signal representing predetermined optimum fuel injection time durations for said engine and which signal is inversely proportional to engine intake manifold vacuum and inversely proportional to engine temperature, means for converting said analog signal to a digital signal, and control signal generator means responsive to the outputs of said timing signal generator means and said means for generating a digital signal for generating said pulse control signals, said pulse control signals having leading edges corresponding to the opening time of each of the cylinder intake valves and pulse widths in accordance with said digital control signal, for establishing the duration of the valve opening times.
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Specification