US3824967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic fuel injection system
Assignee: Motors Liquidation Co
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Filing: 1972-10-30
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Granted: 1974-07-23
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Expires: 1992-10-30
Abstract
Abstract A control voltage is developed across a capacitor. In synchronization with the operation of an internal combustion engine, the capacitor is charged with a charge current to increase the control voltage from an intermediate level to a peak level. In response to the arrival of the control voltage at the peak level, the capacitor is discharged with a first discharge current to decrease the control voltage from the peak level back to the intermediate level. In response to the arrival of the control voltage back at the intermediate level, the capacitor is further discharged with a second discharge current to decrease the control voltage from the intermediate level to a base level. The peak level of the control voltage is determined as a preselected function of a primary engine operating parameter such as intake air pressure. At least one of the charge current and the first discharge current of the capacitor is determined as a preselected function of a secondary engine operating parameter, such as engine temperature, which is multiplicatively related to the primary engine operating parameter. At least one of the second discharge current of the capacitor and the intermediate level and the base level of the control voltage is determined as a preselected function of a secondary engine operating parameter, such as battery supply voltage, which is additively related to the primary engine operating parameter.
Inventors
- 👤 C Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:29
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
348 words
In an internal combustion engine, the combination comprising: a capacitor for developing a control voltage thereacross; means for charging the capacitor with a charge current in synchronization with the operation of the engine to increase the control voltage from an intermediate level to a peak level over a charge time period; means responsive to the arrival of the control voltage at the peak level for discharging the capacitor with a first discharge current to decrease the control voltage from the peak level back to the intermediate level over a first discharge time period; means responsive to the arrival of the control voltage back at the intermediate level for further discharging the capacitor with a second discharge current to decrease the control voltage from the intermediate level to a base level over a second discharge time period; means for defining at least one of the peak level and the charge time period as a preselected function of a primary engine operating parameter; means for defining at least one of the charge current and the first discharge current as a preselected function of a secondary engine operating parameter multiplicatively related to the primary engine operating parameter; means for defining at least one of the second discharge current and the intermediate level and the base level as a preselected function of a secondary engine operating parameter additively related to the primary engine operating parameter; and means for applying fuel to the engine in an amount determined by the time interval established between the initial departure of the control voltage from the intermediate level and the ultimate arrival of the control voltage at the base level so that the total quantity of fuel delivered to the engine is defined in relation to the preselected function of the primary engine operating parameter by a linear fuel control curve having a slope determined by the preselected function of the secondary engine operating parameter multiplicatively related to the primary engine operating parameter and having an offset determined by the preselected function of the secondary engine operating parameter additively related to the primary engine operating parameter.
Claim 2
Dependent Claim
348 words
In an internal combustion engine, the combination comprising: a capacitor for developing a control voltage thereacross; means for charging the capacitor with a charge current in synchronization with the operation of the engine to increase the control voltage from an intermediate level to a peak level over a charge time period; means responsive to the arrival of the control voltage at the peak level for discharging the capacitor with a first discharge current to decrease the control voltage from the peak level back to the intermediate level over a first discharge time period; means responsive to the arrival of the control voltage back at the intermediate level for further discharging the capacitor with a second discharge current to decrease the control voltage from the intermediate level to a base level over a second discharge time period; means for defining at least one of the peak level and the charge time period as a preselected function of a primary engine operating parameter; means for defining at least one of the charge current and the first discharge current as a preselected function of a secondary engine operating parameter multiplicatively related to the primary engine operating parameter; means for defining at least one of the second discharge current and the intermediate level and the base level as a preselected function of a secondary engine operating parameter additively related to the primary engine operating parameter; and means for applying fuel to the engine in an amount determined by the time interval established between the initial departure of the control voltage from the intermediate level and the ultimate arrival of the control voltage at the base level so that the total quantity of fuel delivered to the engine is defined in relation to the preselected function of the primary engine operating parameter by a linear fuel control curve having a slope determined by the preselected function of the secondary engine operating parameter multiplicatively related to the primary engine operating parameter and having an offset determined by the preselected function of the secondary engine operating parameter additively related to the primary engine operating parameter.
Claim 3
Dependent Claim
320 words
In an internal combustion engine, the combination comprising: means for producing a control pulse initiated in synchronization with the operation of the engine and terminated after the expiration of a primary time period Tp defined as a preselected function of a primary engine operating parameter; a capacitor having a capacitance C for developing a control voltage thereacross; means for charging the capacitor with a charge current Ic in respoNse to the initiation of the control pulse to increase the control voltage from an intermediate level Li to a peak level Lp at the termination of the control pulse; means for discharging the capacitor with a first discharge current Id in response to the termination of the control pulse to decrease the control voltage from the peak level Lp back to the intermediate level Li; means for discharging the capacitor with a second discharge current Id in response to the arrival of the control voltage back at the intermediate level Li to decrease the control voltage from the intermediate level Li to a base level Lb; means for applying fuel to the engine in an amount determined by the time interval established between the initial departure of the control voltage from the intermediate level Li and the ultimate arrival of the control voltage at the base level Lb so that the total quantity of fuel Q delivered to the engine is defined by the following equation Q Tp(Ic/Id ) + (Li - Lb) C/Id ; means for defining at least one of the charge current Ic and the first discharge current Id as a preselected function of a secondary engine operating parameter multiplicatively related to the primary engine operating parameter; and means for defining at least one of the second discharge current Id and the intermediate level Li and the base level Lb as a preselected function of a secondary engine operating parameter additively related to the primary engine operating parameter.
Claim 4
Dependent Claim
320 words
In an internal combustion engine, the combination comprising: means for producing a control pulse initiated in synchronization with the operation of the engine and terminated after the expiration of a primary time period Tp defined as a preselected function of a primary engine operating parameter; a capacitor having a capacitance C for developing a control voltage thereacross; means for charging the capacitor with a charge current Ic in respoNse to the initiation of the control pulse to increase the control voltage from an intermediate level Li to a peak level Lp at the termination of the control pulse; means for discharging the capacitor with a first discharge current Id in response to the termination of the control pulse to decrease the control voltage from the peak level Lp back to the intermediate level Li; means for discharging the capacitor with a second discharge current Id in response to the arrival of the control voltage back at the intermediate level Li to decrease the control voltage from the intermediate level Li to a base level Lb; means for applying fuel to the engine in an amount determined by the time interval established between the initial departure of the control voltage from the intermediate level Li and the ultimate arrival of the control voltage at the base level Lb so that the total quantity of fuel Q delivered to the engine is defined by the following equation Q Tp(Ic/Id ) + (Li - Lb) C/Id ; means for defining at least one of the charge current Ic and the first discharge current Id as a preselected function of a secondary engine operating parameter multiplicatively related to the primary engine operating parameter; and means for defining at least one of the second discharge current Id and the intermediate level Li and the base level Lb as a preselected function of a secondary engine operating parameter additively related to the primary engine operating parameter.
Claim 5
Dependent Claim
344 words
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 for producing a control pulse initiated in synchronization with the operation of the engine and terminated at the expiration of a primary time period Tp defined as a preselected function of the pressure of the intake air; a capacitor having a capacitance C for developing a control voltage thereacross; means responsive to the initiation of the primary control pulse for charging the capacitor with a charge current Ic to increase the control voltage from an intermediate level Li to a peak level Lp at the termination of the control pulse; means responsive to the termination of the primary control pulse for discharging the capacitor with a first discharge current Id to decrease the control voltage from the peak level Lp back to the intermediate level Li; means responsive to the arrival of the control voltage back at the intermediate level Li for further discharging the capacitor with a second discharge current Id to decrease the control voltage from the intermediate level Li to a base level Lb; means for energizing the fuel injector with the supply voltage between the initial departure of the control voltage from the intermediate level Li and the ultimate arrival of the control voltage at the base level Lb so that the total quantity of fuel Q applied to the engine is defined by the following equation Q Tp(Ic/Id ) + (Li - Lb) C/Id ; means for defining at least one of the charge current Ic and the first discharge current Id as a preselected function of a temperature of the engine; and means for defining at least one of the second discharge current Id and the intermediate level Li and the base level Lb as a preselected function of the magnitude of the supply voltage.
Claim 6
Dependent Claim
344 words
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 for producing a control pulse initiated in synchronization with the operation of the engine and terminated at the expiration of a primary time period Tp defined as a preselected function of the pressure of the intake air; a capacitor having a capacitance C for developing a control voltage thereacross; means responsive to the initiation of the primary control pulse for charging the capacitor with a charge current Ic to increase the control voltage from an intermediate level Li to a peak level Lp at the termination of the control pulse; means responsive to the termination of the primary control pulse for discharging the capacitor with a first discharge current Id to decrease the control voltage from the peak level Lp back to the intermediate level Li; means responsive to the arrival of the control voltage back at the intermediate level Li for further discharging the capacitor with a second discharge current Id to decrease the control voltage from the intermediate level Li to a base level Lb; means for energizing the fuel injector with the supply voltage between the initial departure of the control voltage from the intermediate level Li and the ultimate arrival of the control voltage at the base level Lb so that the total quantity of fuel Q applied to the engine is defined by the following equation Q Tp(Ic/Id ) + (Li - Lb) C/Id ; means for defining at least one of the charge current Ic and the first discharge current Id as a preselected function of a temperature of the engine; and means for defining at least one of the second discharge current Id and the intermediate level Li and the base level Lb as a preselected function of the magnitude of the supply voltage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |