Patent EP0410574A2 successfully refreshed from Google Patents.
US4770178A
Expired / Lapsed
US
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Method and circuit arrangement for controlling an injection valve
Assignee: Mannesmann VDO AG
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Filing: 1987-04-28
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Granted: 1988-09-13
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Expires: 2007-04-28
Abstract
Abstract In a method for controlling an injection valve for an internal combustion engine in which the magnet coil of the injection valve is connected to pulsate current by means of a semiconductor switch to an operating voltage in such a way that, during a first time interval, a current which is sufficient to open the injection valve flows and that, following same, there is possibly a second time interval which is dependent on the intended injection time and has a current sufficient for holding the valve open. The first time interval is terminated by disconnection when the current has reached a peak valve which is dependent in accordance with a predetermined function on the operating voltage.
Inventors
- 👤 Andreas Sausner
- 👤 Heinz Hohne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:13
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/20; F02D2041/202; F02D2041/2024; F02D2041/2027; F02D2041/2058; F02D2200/00; F02D2200/50; F02D2200/503; H; H01; H01H; H01H47/00; H01H47/22; H01H47/32; H01H47/325
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A method of controlling an injection valve for an internal combustion engine in which the magnet coil of the injection valve is connected by means of a semiconductor switch to an operating voltage to provide current pulses with a current sufficient to open the injection valve during a first time interval, there being a second time interval during which the current flows with sufficient magnitude for the holding open of the valve, the method comprising the steps of storing a relationship of current magnitude as a function of operating voltage; comparing current in the magnet coil with a current magnitude of said storing step; and during the first time interval, terminating a current pulse by disconnection of the current to the coil when the current has reached a peak value equal to said current magnitude of said storing step, the peak value for higher operating voltage being higher than for a lower operating voltage.
Claim 2
Independent Claim
154 words
A method of controlling an injection valve for an internal combustion engine in which the magnet coil of the injection valve is connected by means of a semiconductor switch to an operating voltage to provide current pulses with a current sufficient to open the injection valve during a first time interval, there being a second time interval during which the current flows with sufficient magnitude for the holding open of the valve, the method comprising the steps of storing a relationship of current magnitude as a function of operating voltage; comparing current in the magnet coil with a current magnitude of said storing step; and during the first time interval, terminating a current pulse by disconnection of the current to the coil when the current has reached a peak value equal to said current magnitude of said storing step, the peak value for higher operating voltage being higher than for a lower operating voltage.
Claim 3
Dependent Claim
201 words
A circuit for regulating current flow in the coil of a fuel injector comprising: an output stage and a current measurement resistor serially connected to said coil, said output stage being energized from a source of operating voltage to provide current pulses to said coil for opening a valve of the fuel injector; a first analog/digital converter, the current measurement resistor being connected with the input of said first analog/digital converter; a second analog/digital converter, a source of operating voltage being connected with the output stage and the input of the second analog/digital converter; a processor, the outputs of the analog/digital converters being connected to inputs of said processor, an output of the processor being connected to a control input of the output stage; and a memory, said memory storing a predetermined function of current versus operating voltage for operation of said processor, said function including magnitudes of current stored in said memory; and wherein said circuit provides for the termination of current in one of said current pulses when the current has reached a peak value equal to a current magnitude stored in said memory, the peak value for higher operating voltage being higher than for a lower operating voltage.
Claim 4
Dependent Claim
201 words
A circuit for regulating current flow in the coil of a fuel injector comprising: an output stage and a current measurement resistor serially connected to said coil, said output stage being energized from a source of operating voltage to provide current pulses to said coil for opening a valve of the fuel injector; a first analog/digital converter, the current measurement resistor being connected with the input of said first analog/digital converter; a second analog/digital converter, a source of operating voltage being connected with the output stage and the input of the second analog/digital converter; a processor, the outputs of the analog/digital converters being connected to inputs of said processor, an output of the processor being connected to a control input of the output stage; and a memory, said memory storing a predetermined function of current versus operating voltage for operation of said processor, said function including magnitudes of current stored in said memory; and wherein said circuit provides for the termination of current in one of said current pulses when the current has reached a peak value equal to a current magnitude stored in said memory, the peak value for higher operating voltage being higher than for a lower operating voltage.
References Cited (Backward Citations)
US4148090A
Cited
US4327394A
Cited
US4266261A
Cited
US4347544A
Cited
US4452210A
Cited
US4511945A
Cited
US4605983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |