Electronic fuel injection system

Claim 2

In an internal combustion engine, the combination comprising: means for defining a first time period initiated in synchronization with the operation of the engine and terminated at the expiration of a time duration determined as a preselected function of a first engine operating parameter; means for defining a second time period initiated in response to the initiation of the first time period and terminated before the termination of the first time period at the expiration of a time duration determined as a preselected function of a second engine operating parameter; means for defining a third time period initiated in response to termination of the second time period and terminated after the termination of the first time period at the expiration of a time duration determined by the time duration of the first time period less the time duration of the second time period and determined as a preselected function of a third engine operating parameter; and means for applying fuel to the engine in an amount directly related to a composite time period defined between the initiation of the first time period and the termination of the third time period so that the total quantity of fuel delivered to the engine is defined in relation to the preselected function of the first engine operating parameter by a linear fuel control curve having an offset determined by the preselected function of the second engine operating parameter and having a slope determined by the preselected function of the third engine operating parameter.

Claim 3

In an internal combustion engine system, the combination comprising: means for defining a first time period T1 initiated in synchronization with the operation of the engine and terminated at the expiration of a time duration determined as a preselected function of a first engine operating parameter; means for defining a second time period T2 initiated in response to the initiation of the first time period and terminated before the termination of the first time period at the expiration of a time duration determined as a preselected function of a second engine operating parameter; a capacitor for developing a control voltage thereacross; means for charging the capacitor with a charge current Ic to increase the control voltage from a base level to a peak level over a charge time period initiated in response to the termination of the second time period and terminated in response to the termination of the first time period; means for discharging the capacitor with a discharge current Id to decrease the control voltage from the peak level to the base level over a discharge time period initiated in response to the termination of the first time period and terminated when the control voltage reaches the base level; means for defining at least one of the charge current Ic and the discharge current Id as a preselected function of a third engine operating parameter; and means for applying fuel to the engine in an amount proportional to the time interval defined between the initiation of the first time period T1 and the termination of the discharge time period so that the total quantity of fuel Q delivered to the engine is defined by the following equation: Q not = T1(1 + Ic/Id) - T2(Ic/Id).

Claim 4

In an internal combustion engine system, the combination comprising: means for defining a first time period T1 initiated in synchronization with the operation of the engine and terminated at the expiration of a time duration determined as a preselected function of a first engine operating parameter; means for defining a second time period T2 initiated in response to the initiation of the first time period and terminated before the termination of the first time period at the expiration of a time duration determined as a preselected function of a second engine operating parameter; a capacitor for developing a control voltage thereacross; means for charging the capacitor with a charge current Ic to increase the control voltage from a base level to a peak level over a charge time period initiated in response to the termination of the second time period and terminated in response to the termination of the first time period; means for discharging the capacitor with a discharge current Id to decrease the control voltage from the peak level to the base level over a discharge time period initiated in response to the termination of the first time period and terminated when the control voltage reaches the base level; means for defining at least one of the charge current Ic and the discharge current Id as a preselected function of a third engine operating parameter; and means for applying fuel to the engine in an amount proportional to the time interval defined between the initiation of the first time period T1 and the termination of the discharge time period so that the total quantity of fuel Q delivered to the engine is defined by the following equation: Q not = T1(1 + Ic/Id) - T2(Ic/Id).

Claim 5

In an internal combustion engine including an air supply system for providing intake air to the engine, a battery for providing a supply voltage, and a fuel supply system including at least one voltage responsive fuel injector for applying fuel to the engine when energized by the supply voltage, the combination comprising: means including a first pulse generator for producing a first control pulse initiated in synchronization with the operation of the engine and terminated at the expiration of a time duration determined as a preselected function of the pressure of the intake air; means including a second pulse generator for producing a second control pulse initiated in response to the initiation of the first control pulse and terminated before the termination of the first control pulse at the expiration of a time duration determined as a preselected function of the magnitude of the supply voltage; means including a third pulse generator for producing a third control pulse initiated in response to the termination of the second control pulse and terminated after the termination of the first control pulse at the expiration of a time duration determined by the time duration of the first control pulse less the time duration of the second control pulse and determined as a preselected function of the temperature of the engine; and means for energizing the fuel injector with the supply voltage between the initiation of the first control pulse and the termination of the third control pulse so that the total amount of fuel applied to the engine is defined in relation to the preselected function of the intake air pressure by a linear fuel control curve having an offset determined by the preselected function of the battery supply voltage and having a slope determined by the preselected function of the engine temperature.

Claim 6

In an internal combustion engine including an air supply system for providing intake air to the engine, a battery for providing a supply voltage, and a fuel supply system including at least one voltage responsive fuel injector for applying fuel to the engine when energized by the supply voltage, the combination comprising: means including a first pulse generator for producing a first control pulse initiated in synchronization with the operation of the engine and terminated at the expiration of a time duration determined as a preselected function of the pressure of the intake air; means including a second pulse generator for producing a second control pulse initiated in response to the initiation of the first control pulse and terminated before the termination of the first control pulse at the expiration of a time duration determined as a preselected function of the magnitude of the supply voltage; means including a third pulse generator for producing a third control pulse initiated in response to the termination of the second control pulse and terminated after the termination of the first control pulse at the expiration of a time duration determined by the time duration of the first control pulse less the time duration of the second control pulse and determined as a preselected function of the temperature of the engine; and means for energizing the fuel injector with the supply voltage between the initiation of the first control pulse and the termination of the third control pulse so that the total amount of fuel applied to the engine is defined in relation to the preselected function of the intake air pressure by a linear fuel control curve having an offset determined by the preselected function of the battery supply voltage and having a slope determined by the preselected function of the engine temperature.

Claim 7

In an internal combustion engine including a coolant supply system for providing coolant to the engine, an air supply system for providing intake air to the engine, a battery for providing a supply voltage, and a fuel supply system including at least one voltage responsive fuel injector for applying fuel to the engine when energized by the supply voltage, the combination comprising: means including a first pulse generator for producing a first control pulse initiated in synchronization with the operation of the engine and terminated at the expiration of a time duration determined as a preselected direct function of the pressure of the intake air; means including a second pulse generator for producing a second control pulse iniTiated in response to the initiation of the first control pulse and terminated before the termination of the first control pulse at the expiration of a time duration determined as a preselected direct function of the magnitude of the battery supply voltage; means including a third pulse generator for producing a third control pulse initiated in response to the termination of the second control pulse and terminated after the termination of the first control pulse at the expiration of a time duration determined by the time duration of the first control pulse less the time duration of the second control pulse and determined as a preselected inverse function of the temperature of the intake air and a preselected inverse function of the temperature of the engine coolant and a preselected direct function of the temperature of the injected fuel; and means for energizing the fuel injector with the supply voltage between the initiation of the first control pulse and the termination of the third control pulse so that the total quantity of fuel applied to the engine is defined in relation to the preselected direct function of the intake air pressure by a straight-line fuel control function having an offset determined by the preselected direct function of the battery supply voltage and having a slope determined by the preselected inverse function of the intake air temperature and the preselected inverse function of the engine coolant temperature and the preselected direct function of the injected fuel temperature.

Claim 8

In an internal combustion engine including a coolant supply system for providing coolant to the engine, an air supply system for providing intake air to the engine, a battery for providing a supply voltage, and a fuel supply system including at least one voltage responsive fuel injector for applying fuel to the engine when energized by the supply voltage, the combination comprising: means including a first pulse generator for producing a first control pulse initiated in synchronization with the operation of the engine and terminated at the expiration of a time duration determined as a preselected direct function of the pressure of the intake air; means including a second pulse generator for producing a second control pulse iniTiated in response to the initiation of the first control pulse and terminated before the termination of the first control pulse at the expiration of a time duration determined as a preselected direct function of the magnitude of the battery supply voltage; means including a third pulse generator for producing a third control pulse initiated in response to the termination of the second control pulse and terminated after the termination of the first control pulse at the expiration of a time duration determined by the time duration of the first control pulse less the time duration of the second control pulse and determined as a preselected inverse function of the temperature of the intake air and a preselected inverse function of the temperature of the engine coolant and a preselected direct function of the temperature of the injected fuel; and means for energizing the fuel injector with the supply voltage between the initiation of the first control pulse and the termination of the third control pulse so that the total quantity of fuel applied to the engine is defined in relation to the preselected direct function of the intake air pressure by a straight-line fuel control function having an offset determined by the preselected direct function of the battery supply voltage and having a slope determined by the preselected inverse function of the intake air temperature and the preselected inverse function of the engine coolant temperature and the preselected direct function of the injected fuel temperature.

Claim 9

In an internal combustion engine system including an air supply system for providing intake air to the engine, a battery for providing a supply voltage, and a fuel supply system including at least one electromagnetic fuel injector for applying fuel to the engine when energized by the supply voltage, the combination comprising: means including a timing pulse generator for producing timing pulses at a frequency proportional to the speed of the engine; means including a first pulse generator for producing first control pulses each initiated in response to the occurrence of a timing pulse and each terminated after a time duration T1 determined as a preselected function of the pressure of the intake air; means including a second control pulse generator for producing second control pulses each initiated in response to the initiation of a first control pulse and each terminated before the termination of the first control pulse after a time duration T2 determined as a preselected function of the magnitude of the supply voltage; a capacitor for developing a control voltage thereacross; means for charging the capacitor with a charge current Ic to increase the control voltage from a base level to a peak level over a charge time period initiated in response to the termination of the second control pulse and terminated in response to the termination of the first control pulse; means for discharging the capacitor with a discharge current Id to decrease the control voltage from the peak level to the base level over a discharge time period initiated in response to the termination of the first control pulse and terminated when the control voltage reaches the base level; means for defining at least one of the charge current Ic and the discharge current Id as a preselected function of the temperature of the intake air, as a preselected function of the temperature of the engine coolant, and as a preselected function of the temperature of the injected fuel; and means for energizing the fuel injector with the supply voltage between the initiation of the first time duration T1 and the termination of the discharge time period so that the total quantity of fuel Q delivered to the engine is defined by the following equation: Q not = T1(1 + Ic/Id) -T2(Ic/Id).

Claim 10

In an internal combustion engine system including an air supply system for providing intake air to the engine, a battery for providing a supply voltage, and a fuel supply system including at least one electromagnetic fuel injector for applying fuel to the engine when energized by the supply voltage, the combination comprising: means including a timing pulse generator for producing timing pulses at a frequency proportional to the speed of the engine; means including a first pulse generator for producing first control pulses each initiated in response to the occurrence of a timing pulse and each terminated after a time duration T1 determined as a preselected function of the pressure of the intake air; means including a second control pulse generator for producing second control pulses each initiated in response to the initiation of a first control pulse and each terminated before the termination of the first control pulse after a time duration T2 determined as a preselected function of the magnitude of the supply voltage; a capacitor for developing a control voltage thereacross; means for charging the capacitor with a charge current Ic to increase the control voltage from a base level to a peak level over a charge time period initiated in response to the termination of the second control pulse and terminated in response to the termination of the first control pulse; means for discharging the capacitor with a discharge current Id to decrease the control voltage from the peak level to the base level over a discharge time period initiated in response to the termination of the first control pulse and terminated when the control voltage reaches the base level; means for defining at least one of the charge current Ic and the discharge current Id as a preselected function of the temperature of the intake air, as a preselected function of the temperature of the engine coolant, and as a preselected function of the temperature of the injected fuel; and means for energizing the fuel injector with the supply voltage between the initiation of the first time duration T1 and the termination of the discharge time period so that the total quantity of fuel Q delivered to the engine is defined by the following equation: Q not = T1(1 + Ic/Id) -T2(Ic/Id).