US3780711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic fuel injection system
Assignee: Carter Automotive Co Inc
•
Filing: 1971-12-16
•
Granted: 1973-12-25
•
Expires: 1991-12-16
Abstract
Abstract A sequential fuel injection system for an internal combustion engine has a separate electrical channel for each injector, each channel including a binary electronic counter. All said counters receive pulses from a voltage controlled generator whose frequency is set by the fuel demand. Engine operated timing means cause the counters to operate sequentially. An injector may be put into operation while a preceding injector is still being actuated, thus affording longer periods of injector operation.
Inventors
- 👤 A Lindberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:58
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/2403
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
An electronic fuel injection system for an internal combustion engine having a plurality of cylinders, comprising an electrically operated fuel injector for each cylinder; a channel connected to each injector for opening and closing it, each channel including a digital divider circuit for holding the injector connected thereto open during the counting of a predetermined number of input pulses; engine operated timing means for impressing voltage pulses on the divider circuits to start said circuits sequentially; a variable frequency fuel pulse generator connected to the inputs of all said divider circuits; and means connected to said pulse generator for controlling its frequency inversely in accordance with the fuel demand, whereby said injectors are actuated for periods proportional to the fuel demand.
Claim 2
Dependent Claim
121 words
An electronic fuel injection system for an internal combustion engine having a plurality of cylinders, comprising an electrically operated fuel injector for each cylinder; a channel connected to each injector for opening and closing it, each channel including a digital divider circuit for holding the injector connected thereto open during the counting of a predetermined number of input pulses; engine operated timing means for impressing voltage pulses on the divider circuits to start said circuits sequentially; a variable frequency fuel pulse generator connected to the inputs of all said divider circuits; and means connected to said pulse generator for controlling its frequency inversely in accordance with the fuel demand, whereby said injectors are actuated for periods proportional to the fuel demand.
Claim 3
Dependent Claim
29 words
A system according to claim 1, including means for preventing said pulse generator from impressing pulses on a divider circuit after receipt of said predetermined number of pulses thereby.
Claim 4
Dependent Claim
35 words
A system according to claim 2, wherein said last named means includes a NOR gate adapted to be closed by the output of the divider circuit after a count of said predetermined number of pulses.
Claim 5
Dependent Claim
44 words
A system according to claim 1, wherein each channel includes means connected between the timing means and a divider circuit for resetting said divider circuit so as to enable it to start a new count in response to the next timing pulse received thereby.
Claim 6
Dependent Claim
48 words
A system according to claim 4, wherein each said means for resetting a divider circuit includes an AND gate and means feeding the output of each divider circuit to one inout of the AND gate connected thereto to hold said gate open while the divider circuit is counting.
Claim 7
Dependent Claim
115 words
An elecronic fuel injector system for an internal combustion engine having a plurality of electrically operated fuel injectors; a binary electronic counter adapted to produce an output signal in response to a predetermined number of pulses impressed on the input thereof; a voltage controlled pulse generator connected to the input of said counter for supplying said pulses; means connected to said pulse generator for setting its frequency inversely in accordance with the fuel demand; engine operated pulse producing timing means; means connecting said timing means to said counter for initiating counting thereby; and means responsive to Said timing means for opening a fuel injector and responsive to said output signal for closing said fuel injector.
Claim 8
Dependent Claim
115 words
An elecronic fuel injector system for an internal combustion engine having a plurality of electrically operated fuel injectors; a binary electronic counter adapted to produce an output signal in response to a predetermined number of pulses impressed on the input thereof; a voltage controlled pulse generator connected to the input of said counter for supplying said pulses; means connected to said pulse generator for setting its frequency inversely in accordance with the fuel demand; engine operated pulse producing timing means; means connecting said timing means to said counter for initiating counting thereby; and means responsive to Said timing means for opening a fuel injector and responsive to said output signal for closing said fuel injector.
Claim 9
Dependent Claim
19 words
A system according to claim 6, including means responsive to said output signal for terminating counting by said counter.
Claim 10
Dependent Claim
26 words
A system according to claim 6, including means responsive to said output signal for blocking the supply of pulses from the pulse generator to said counter.
Claim 11
Dependent Claim
24 words
A system according to claim 8, including means responsive to said output signal for resetting said counter in condition for starting a new count.
Claim 12
Dependent Claim
29 words
A system according to claim 9, wherein said means for resetting said counter operates to reset it only after receiving pulses from said timing means and said pulse generator.
Claim 13
Dependent Claim
31 words
A system according to claim 6, wherein said engine has a plurality of cylinders and a fuel injector for each cylinder, and a binary electronic counter connected to each fuel injector.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |