GB1329519A - Electronic fuel injection systems - Google Patents
Electronic fuel injection systemsInfo
- Publication number
- GB1329519A GB1329519A GB3623572A GB3623572A GB1329519A GB 1329519 A GB1329519 A GB 1329519A GB 3623572 A GB3623572 A GB 3623572A GB 3623572 A GB3623572 A GB 3623572A GB 1329519 A GB1329519 A GB 1329519A
- Authority
- GB
- United Kingdom
- Prior art keywords
- speed
- pulses
- engine
- injection
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/32—Controlling fuel injection of the low pressure type
- F02D41/36—Controlling fuel injection of the low pressure type with means for controlling distribution
- F02D41/365—Controlling fuel injection of the low pressure type with means for controlling distribution with means for controlling timing and distribution
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
1329519 Fuel injection systems for I.C. engines GENERAL MOTORS CORP 3 Aug 1972 [7 Sept 1971] 36235/72 Heading G1N In an I.C. engine electronic fuel injection system, injection is prevented when the demand for engine power is decreased (i.e. the throttle is closed) and the engine speed is above a reference speed just above the idling speed by generating a speed voltage S which increases over a first fixed portion of engine rotation in each cycle, generating timing pulses P which occur at the end of a second fixed portion of engine rotation in each cycle, which end occurs during the first fixed portion, and disabling the fuel injection means when the amplitude of the speed voltage at the instant of occurrence of a timing pulse P is below a reference level R corresponding to the reference speed. As shown in Fig.1, a synchronizer 38 sequentially applies fuel injection pulses processed by a controller 36 under the control of a timer 34, Fig. 2 (not shown). A deceleration fuel control circuit 60 is responsive to signals A1 and A3 provided in the synchronizer 38, these signals having a pulse durations corresponding to 180 degrees engine rotation but displaced relatively by 90 degrees, and the position of the throttle 26 in the air intake manifold 20, to short circuit the injection pulses processed by the controller 36 when prevention of injection is desired. As shown in Fig. 4, the deceleration control circuit 60 includes a speed signal generator 80 which provides the signal S during the pulses of signal A1, a reference signal generator 90, a differential amplifier 106 which assumes a first or a second state depending upon the relative amplitudes of the speed signal and the reference signal, a differentiator 132 for providing the timing pulses P at the occurrence of the pulses of signal A3, AND gates 136, 138 responsive to the pulses P and the states of the transistors of the differential amplifier to control a bi-stable circuit 178, the bi-stable circuit in one state controlling the reference signal generator 90 to provide a first reference level Lu corresponding to the reference speed and in the other state to provide a second reference level Lo corresponding to a higher speed, and a switch L10 which is closed when the throttle 26 is closed. In operation, and with reference to Figs. 5 and 6, when the engine is accelerating towards a speed Nu and through Nu injection proceeds normally, the reference level being set at Lo, Figs. 5b and 5c. At the time t 1 , demand for engine power is decreased by closing the throttle 26, thereby closing switch 210. In this condition, since the amplitude of the speed signal at the occurrence of the pulses P is below the reference level, a transistor 224 is rendered conductive to by-pass the injection pulses from controller 36 to ground. The engine speed then decreases until, at the instant when the amplitude of the speed signal at the occurrence of the pulses P is above the reference value Lu, Fig.5a, and the bi-stable circuit is switched to its other state, fuel is re-supplied. This occurs between the instants t 2 and t 3 after which injection proceeds normally at the idling speed of the engine.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17827171A | 1971-09-07 | 1971-09-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1329519A true GB1329519A (en) | 1973-09-12 |
Family
ID=22651889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3623572A Expired GB1329519A (en) | 1971-09-07 | 1972-08-03 | Electronic fuel injection systems |
Country Status (4)
Country | Link |
---|---|
US (1) | US3731659A (en) |
JP (1) | JPS503451B2 (en) |
CA (1) | CA964349A (en) |
GB (1) | GB1329519A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS602508B2 (en) * | 1977-07-15 | 1985-01-22 | 株式会社デンソー | Fuel stop device for electronically controlled fuel injection system |
US4214307A (en) * | 1978-06-22 | 1980-07-22 | The Bendix Corporation | Deceleration lean out feature for electronic fuel management systems |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1526503B1 (en) * | 1966-11-03 | 1971-03-04 | Bosch Gmbh Robert | Fuel injection system |
DE1576284C3 (en) * | 1967-07-12 | 1975-01-16 | Robert Bosch Gmbh, 7000 Stuttgart | Fuel injection system with at least one electromagnetically actuated injection valve |
SE341888B (en) * | 1968-09-21 | 1972-01-17 | Bosch Gmbh Robert | |
US3612013A (en) * | 1969-11-24 | 1971-10-12 | Gen Motors Corp | Fuel supply control system for an internal combustion engine |
-
1971
- 1971-09-07 US US00178271A patent/US3731659A/en not_active Expired - Lifetime
-
1972
- 1972-07-24 CA CA147,761A patent/CA964349A/en not_active Expired
- 1972-08-03 GB GB3623572A patent/GB1329519A/en not_active Expired
- 1972-09-07 JP JP47089139A patent/JPS503451B2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS4836518A (en) | 1973-05-30 |
DE2243966A1 (en) | 1973-03-22 |
US3731659A (en) | 1973-05-08 |
CA964349A (en) | 1975-03-11 |
DE2243966B2 (en) | 1977-04-07 |
JPS503451B2 (en) | 1975-02-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |