US3749065A - Acceleration enrichment circuit for electronic fuel control systems - Google Patents

Acceleration enrichment circuit for electronic fuel control systems Download PDF

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Publication number
US3749065A
US3749065A US00011988A US3749065DA US3749065A US 3749065 A US3749065 A US 3749065A US 00011988 A US00011988 A US 00011988A US 3749065D A US3749065D A US 3749065DA US 3749065 A US3749065 A US 3749065A
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United States
Prior art keywords
acceleration
circuit
output signal
signal
engine
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Expired - Lifetime
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US00011988A
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English (en)
Inventor
R Rothfusz
J Nagy
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Bendix Corp
Siemens Automotive LP
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Bendix Corp
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Assigned to SIEMENS-BENDIX AUTOMOTIVE ELECTRONICS L.P., A LIMITED PARTNERSHIP OF DE reassignment SIEMENS-BENDIX AUTOMOTIVE ELECTRONICS L.P., A LIMITED PARTNERSHIP OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ALLIED-SIGNAL INC.
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    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/10—Introducing corrections for particular operating conditions for acceleration
    • F02D41/105—Introducing corrections for particular operating conditions for acceleration using asynchronous injection

Definitions

  • the circuit includes a first circuit to 3,623,459 11/1971 Gordon 123/32 EA Provide an immediate Pulse of fuel to the injector 3,548,791 12 1970 Long 123/32 group most recently energized and a Second Circuit 3,593,692 7/1971 Scholl 123/32 EA lengthen the injection commands to each injector for 2,867,200 l/l959 Gryder.... 123/32 a period of time sufficient to accomplish the desired ac- 3,240,l9l 3/1966 Wallis 123/32 cele atiom 3,319,613 5/1967 Begley 123/32 3,429,302 2/1969 Scholl 123/32 3 Claims, 2 Drawing Figures 34c r0 c040 START 34b CIRCUIT PATENTIED 3. 749. 065
  • the present invention relates to improvements in electronic fuel control systems and particularly to improvements in automotive electronic fuel control systems whereby an acceleration enrichment function is provided.
  • the knownelectronic fuel control systems currently rely upon the input information from their various parameter sensors to provide information required by an electronic fuel control system to provide acceleration enrichment.
  • These sensors generally, sense the engine temperature, which may be the temperature of the water jacket, to indicate the operating temperature of the engine, the engine speed to determine timing and engine fuel requirements, the intake manifold pressure to sense the load on the engine and various other parameters as needed or desired.
  • acceleration enrichment may be provided in the form of an additional re- 'sistance in the time duration controlling portion of the electronic fuel control circuits. Since the circuits generally use a variable RC network to determine the length of the injection pulse, it was felt to be sufficient to provide an additional resistance (either in series or parallel) with theregular resistance of the RC network which additional resistance could be appropriately shunted or short-circuited when not necessary to the operation of the electronic fuel control circuit. This, however, produced a problem with the recovery time of the RC circuit which rendered this approach inadequate. It is, therefore, an object of this invention to provide an acceleration enrichment circuit for electronic fuel control systems which does not alter the operational characteristics of the main electronic fuel control computing means. It is a still further object of the present invention to provide an acceleration enrichment circuit which varies the injection time by adding a pulse to the injection pulse rather than by lengthening regularly generated injection pulses.
  • the response lag is due to two factors.
  • the first of these factors is the group injection concept itself which causes fuel to be delivered to a plurality of injectors as afunction of the engine operating parameters at the time of injection. Since this is immediately prior to the time of opening of the intake port of the first cylinder in the group to be ignited, the fuel provided'to subsequent cylinders in the group might not be in the proper amount. Acceleration commands or needs would, therefore, lag until the time of injection of the next group.
  • Group injection is the combining of selected injectors into groups with each member of the group being simultaneously activated and ditferentgroups being activated sequentially.
  • a second cause for the response lag is the lag in response at the intake manifold pressure sensor which lag is necessitated by the fact that the actual pressure varies, or ripples, over a wide range during an engine cycle. This variation occurs as intake ports open and air is drawn into the engine cylinders whereas some weighted average pressure signal is required by the electronic fuel control system.
  • the pressure sensor is, therefore, damped to respond sluggishly to pressure variations. It is an object of the present invention to providean electronic circuit means for overcoming at least a portion of the abovenoted response lag. It is a still further object of the present invention to provide such a circuit which operates to overcome that portion of the pressure lag caused by group injection.
  • the present invention provides a special function auxiliary circuit for an electronic fuel control system capable of providing acceleration enrichment.
  • the acceleration enrichment auxiliary circuit senses the need for such enrichment and then provides (1) an injection pulse of predetermined duration for application to that group of injector nozzles which has most recently been energized and (2) an additional pulse of predetermined duration for addition to each injector command pulse for a period of time following the initial pulse.
  • the first pulse is operative to overcome that portion of the response lag due to group injection while the added pulses serve to lengthen the injection time period during that period of time when the manifold pressure sensor has not yet responded to the pressure change in the manifold.
  • FIG. 1 shows, in diagrammatic circuit form, an electronic fuel control system computation circuit as adapted, for instance, for automotive use.
  • FIG. 2 shows, in diagrammatic circuit form, an auxiliary circuit according to the present invention for pro viding the acceleration enrichment function.
  • FIG. 1 an electronic fuel control system computation circuit 10 is shown.
  • the circuit is shown as being energized by a voltage supply designated as B+ at the various locations noted.
  • the voltage supply could be the battery and/or battery charging system conventionally used as the vehicle's electric power source.
  • the electrical polarity of the voltage supply could readily be reversed.
  • the circuit receives, along with the voltage supply, various voltage signal sensory inputs indicative of various operating parameters of the associated engine.
  • Intake manifold pressure sensor 12 supplies a voltage indicative of manifold pressure
  • temperature sensor 14 is operative to vary the voltage across the parallel resistance to provide a voltage signal indicative of engine temperature and voltage signals indicative of engine speed are received at circuit input port 16.
  • This signal may be derived from any source indicative of engine crank angle but is preferably from the engine's ignition distributor, not shown.
  • the circuit 10 is operative to provide two consecutive pulses, of variable duration, through sequential networks to circuit location 18 to thereby control the on time of transistor 20.
  • the first pulse is provided via resistor 22 from that portion of circuit 10 having inputs indicative of engine crank angle and intake manifold pressure.
  • the termination of this pulse initiates a second pulse which is provided via resistor 24 from that portion of the circuit 10 having an input from the temperature sensor 14.
  • These pulses, received sequentially at circuit location 18, serve to turn transistor on" (that is, transistor 20 is triggered into the conduction state) and a relatively low voltage signal is present at circuit output port 26.
  • This port may be connected, through suitable inverters and/or amplifiers (not shown) to the injector means (also not shown) such that the selected injector means are energized whenever the transistor 20 is on. It is the current practice to use switching means to control which of the injector valve means are coupled to circuit location 26 when the system is used to actuate less than all injector valve means at any one time. Because the injector valve means are relatively slow acting, compared with the speed of electronic devices, the successive pulses at circuit point 18 will result in the injector valve means, not shown, remaining open until after the termination of the second pulse.
  • the duration of the first pulse is controlled by the monostable multivibrator network associated with transistor 28 and 30.
  • Thepresence of a pulse received via input port 16 will trigger the multivibrator into its unstable state with transistor 28 in the conducting state and transistor 30 blocked (or in the nonconducting state).
  • the period of time during which transistor 28 is conducting will be controlled by the voltage signal from manifold pressure sensor 12. Conduction of transistor 28 will cause the collector 28c thereof to assume a relatively low voltage close to the ground or common voltage. This low voltage will cause the base 34b of transistor 34 to assume a low voltage below that required for transistor 34 to be triggered into the conduction state, thus causing transistor 34 to be turned off.
  • the voltage at the collector 340 will, therefore, rise toward the 13+ value and will be communicated via resistor 22 to circuit location 18 where it will trigger transistor 20 into the on" or conduction state thus imposing a relatively low voltage at circuit port 26.
  • the presence of a low voltage signal at circuit port 26 will cause the selected injector valve means to open.
  • transistor 30 When the voltage from the manifold pressure sensor 12 has decayed to the value necessary for the multivibrator to relax or return to its stable condition, transistor 30 will be triggered 011" and transistor 28 will be turned “off”. This will, in turn, cause transistor 34 to turn “on, transistor 20 to turn off and thereby remove the injector control signal from circuit port 26.
  • transistor 34 During the period of time that transistor 34 has been held in the non-conducting, or "off" state, the relatively 'high voltage at collector 340 has been applied to the base of transistor 36, triggering the transistor 36 on.
  • the resistor network 38 connected to the voltage supply, acts, with transistor 36 as a current source and current flows through the conducting transistor 36 and begins to charge capacitor 40.
  • transistor 42 has been biased on” and, with the resistor network 44 constitutes a second current source. Currents from both sources flow into the base of transistor 46 thereby holding this transistor on which results in a low voltage at the collector 46c. This low voltage is communicated to the base of transistor 20 via resistor 24.
  • transistor 34 When transistor 28 turns off signalling termination of the first pulse, transistor 34 turns on and the potential at the collector 34c falls to a low value.
  • the capacitor will then have been charged, with the polarity shown in FIG. 1, to a value representative of the duration of the first pulse.
  • the potential at the collector of transistor 36 will be only slightly positive with respect to ground since only several pn junctions separate it from ground. This will impose a negative voltage on circuit location 48 which will reverse bias diode 50 and transistor 46 will be turned off".
  • the duration of the second pulse will be a function of the time required for circuit location 48 to become sufficiently positive for diode 50 to be forward biased. This, in turn, is a function of the charge on capacitor 40 and the magnitude of the charging current supplied by the current source comprised of transistor 42 and resistor network 44.
  • the charge on capacitor 40 is, of course, a function of the duration of the first pulse.
  • the rate of charge i.e., magnitude of the charging current
  • the acceleration enrichment auxiliary circuit is comprised of a pair of interconnected circuits 81, 83 the first of which, 81, is operative to produce a single injection command of fixed duration immediately upon receipt of a signal indicative of a demand for acceleration enrichment, and the second of which is' operative to produce a sequence or series of injection command pulses which serveto increase the total injecrichment.
  • the signal is the appearance at circuit location 82 of ground which may be achieved by a contact closure at a switch, not shown, I
  • the first command signal (received at circuit location 82) is also operative to enable the second circuit, 83, to generate the sequence of pulses necessary to provide the lengthened injection command pulses for a period of time following receipt of the signal indicative of the need for acceleration enrichment.
  • the second circuit 83 is enabled by removing the slight positive voltage at the base 94b of transistor switch 94.
  • the base 94b is coupled through diode 96, capacitor 98 and re- 'sistor 100 to circuit location B which is common with a similarly designated portion of the FIG. 1 circuit which generates the second pulse of the computed injection command.
  • the duration of application of the added acceleration injection command pulses is controlled by the length of time that the acceleration enrichment command is received at circuit location 82 since an absense of that command will permit the base 94): of transistor 94 to rise to the positive value which will reverse-bias diode 96 and disable the second circuit 83.
  • acceleration enrichment circuit accomplishes its stated objectives.
  • An acceleration enrichment circuit is provided which is comprised of two intercoupled circuits to provide an extra quantity of fuel to that group of electromechanical injector valve means which have most recently provided fuel to the engine while a second circuit lengthens or stretches the injection time of an incremental amount for each injection command pulse for a period of time corresponding to the need for acceleration enrichment.
  • a fuel control for engines comprising:
  • sensor means responsive to engine operating parameters operative to generate signals having variable characteristics indicative of the engine operating parameters
  • computation circuit means responsive to said sensor means signals operative to generate a first output signal having a variable characteristic indicative of the engine demand for fuel and adapted to actuate injector valve means to control fuel delivery to the engine in accord with the output signal variable characteristic;
  • acceleration circuit means mutually responsive to the acceleration signal and to selected variations in the first output signal variable characteristic operative to generate acceleration output signals having a variable characteristic which resembles the first output signal variable characteristic and which is independent of the characteristics of the acceleration signal including means to additively combine the first output signal variable characteristic and the acceleration output signal variable characteristic to form an injector valve means signal having a variable characteristic.
  • variable characteristics are variable time duration pulses and said acceleration circuit means are mutually responsive to the acceleration signal and the termination of said computation circuit means pulse to produce an acceleration output pulse'whose origin substantially coincides in time with the termination of the computation circuit means pulse.

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  • 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)
  • Fuel-Injection Apparatus (AREA)
US00011988A 1970-02-17 1970-02-17 Acceleration enrichment circuit for electronic fuel control systems Expired - Lifetime US3749065A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1198870A 1970-02-17 1970-02-17

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US3749065A true US3749065A (en) 1973-07-31

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US00011988A Expired - Lifetime US3749065A (en) 1970-02-17 1970-02-17 Acceleration enrichment circuit for electronic fuel control systems

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US (1) US3749065A (enrdf_load_stackoverflow)
JP (1) JPS5023458B1 (enrdf_load_stackoverflow)
AR (1) AR194566A1 (enrdf_load_stackoverflow)
BR (1) BR7100980D0 (enrdf_load_stackoverflow)
CA (1) CA936940A (enrdf_load_stackoverflow)
ES (1) ES388375A1 (enrdf_load_stackoverflow)
FR (1) FR2083872A5 (enrdf_load_stackoverflow)
GB (1) GB1284510A (enrdf_load_stackoverflow)
SE (1) SE369756B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926153A (en) * 1974-04-03 1975-12-16 Bendix Corp Closed throttle tip-in circuit
US4010717A (en) * 1975-02-03 1977-03-08 The Bendix Corporation Fuel control system having an auxiliary circuit for correcting the signals generated by the pressure sensor during transient operating conditions
US4084552A (en) * 1975-07-08 1978-04-18 Robert Bosch Gmbh Method and apparatus for fuel injection control
US4144847A (en) * 1975-12-27 1979-03-20 Nissan Motor Company, Limited Emission control apparatus for internal engines with means for generating step function voltage compensating signals
US4148283A (en) * 1976-07-19 1979-04-10 Nippondenso Co., Ltd. Rotational speed detecting apparatus for electronically-controlled fuel injection systems
US4244023A (en) * 1978-02-27 1981-01-06 The Bendix Corporation Microprocessor-based engine control system with acceleration enrichment control
US4245312A (en) * 1978-02-27 1981-01-13 The Bendix Corporation Electronic fuel injection compensation
US4255789A (en) * 1978-02-27 1981-03-10 The Bendix Corporation Microprocessor-based electronic engine control system
US5003944A (en) * 1990-05-14 1991-04-02 Chrysler Corporation Transition fuel multiplier

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5341466U (enrdf_load_stackoverflow) * 1976-09-14 1978-04-10
JPH0684735B2 (ja) * 1984-12-28 1994-10-26 スズキ株式会社 燃料噴射制御方法

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926153A (en) * 1974-04-03 1975-12-16 Bendix Corp Closed throttle tip-in circuit
US4010717A (en) * 1975-02-03 1977-03-08 The Bendix Corporation Fuel control system having an auxiliary circuit for correcting the signals generated by the pressure sensor during transient operating conditions
US4084552A (en) * 1975-07-08 1978-04-18 Robert Bosch Gmbh Method and apparatus for fuel injection control
US4144847A (en) * 1975-12-27 1979-03-20 Nissan Motor Company, Limited Emission control apparatus for internal engines with means for generating step function voltage compensating signals
US4148283A (en) * 1976-07-19 1979-04-10 Nippondenso Co., Ltd. Rotational speed detecting apparatus for electronically-controlled fuel injection systems
US4244023A (en) * 1978-02-27 1981-01-06 The Bendix Corporation Microprocessor-based engine control system with acceleration enrichment control
US4245312A (en) * 1978-02-27 1981-01-13 The Bendix Corporation Electronic fuel injection compensation
US4255789A (en) * 1978-02-27 1981-03-10 The Bendix Corporation Microprocessor-based electronic engine control system
US5003944A (en) * 1990-05-14 1991-04-02 Chrysler Corporation Transition fuel multiplier

Also Published As

Publication number Publication date
SE369756B (enrdf_load_stackoverflow) 1974-09-16
DE2106910A1 (de) 1971-10-14
FR2083872A5 (enrdf_load_stackoverflow) 1971-12-17
DE2106910B2 (de) 1972-11-16
AR194566A1 (es) 1973-07-31
JPS5023458B1 (enrdf_load_stackoverflow) 1975-08-07
BR7100980D0 (pt) 1973-02-27
CA936940A (en) 1973-11-13
GB1284510A (en) 1972-08-09
ES388375A1 (es) 1973-05-01

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AS Assignment

Owner name: SIEMENS-BENDIX AUTOMOTIVE ELECTRONICS L.P., A LIMI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ALLIED-SIGNAL INC.;REEL/FRAME:005006/0282

Effective date: 19881202