US3846625A - Computing device for an interpolation - Google Patents

Computing device for an interpolation Download PDF

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Publication number
US3846625A
US3846625A US00334401A US33440173A US3846625A US 3846625 A US3846625 A US 3846625A US 00334401 A US00334401 A US 00334401A US 33440173 A US33440173 A US 33440173A US 3846625 A US3846625 A US 3846625A
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values
counting
address
computing device
interpolation
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US00334401A
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English (en)
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T Sasayama
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Hitachi Ltd
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Hitachi Ltd
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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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2409—Addressing techniques specially adapted therefor
    • F02D41/2416—Interpolation techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • F02P5/15—Digital data processing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/17—Function evaluation by approximation methods, e.g. inter- or extrapolation, smoothing, least mean square method
    • G06F17/175—Function evaluation by approximation methods, e.g. inter- or extrapolation, smoothing, least mean square method of multidimensional data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the first read-out address is a near address to the value corresponding to desired variations in a lower direction and the read-out address is scanned sequentially in the same distance to the distance between said selected variations in every direction of the variations, in order to obtain the volume dependent on the memorized values of the selected variations near to the desired variations.
  • This invention relates to a computing device for interpolation and more particularly to a computing device which is suitable for determining the quantity of fuel injection or for advancing the angle of ignition of an engine.
  • One problem is to determine precisely the quantity of injection fuel or the degree of advancing of the angle of ignition to produce minimum exhaust.
  • a computing device for calculating the quantity of fuel injection or the advancing angle of engine ignition is needed.
  • the conventional fuel injection control system like the conventional ignition advancing control system is of the analogue type and therefore cannot de termine precisely the quantity of the fuel or the advancing angle of ignition required for efficient operation.
  • the discharge characteristic of a capacitor is used as a measure and the value of the resistor forming part of the discharge circuit including the capacitor is controlled by the suction of the intake manifold so as to change the discharge time of the capacitor in response to the suction.
  • the fuel quantity is determined in response to the discharge time.
  • the determined fuel quantity is not an accurate value which is the most suitable value to that engine condition.
  • analogue type control device or analogue type calculating device
  • the controlled value or the calculated value is dependent upon circumferential conditions, particular temperatures, etc.
  • the calculated value in winter is different from that in summer. Therefore, a digital type calculating device is more desirable in such cases.
  • the digital type calculating device in order to regulate the fuel quantity or the advancing ignition angle of the engine, it is required to memorize the needed data which is used for determining that quantity or the ignition angle.
  • the memory stores the values, each value being determined by each engine condition or each value of the engine speed and the suction of the intake manifold. The engine condition is continuously measured, and the fuel quantity or the advancing angle of ignition is determined by the stored value which corresponds to that engine condition.
  • the memory cannot memorize all values corresponding to all engine conditions and therefore the memorized value is discontinuous.
  • the price of the memory increases in response to the volume of the memorized value. Therefore, it is necessary to develop a calculating machine for interpolation in order to decrease the cost of the device.
  • the primary object of this invention is to provide an economical computing device for interpolation of values.
  • Another object of this invention is to provide a computing device which is suitable for determining the quantity of fuel injection or the advance angle of ignition of the engine to produce efficient operation.
  • a further object of this invention is to provide a computing device for interpolation of values which is independent of circumferential temperature.
  • the present invention includes an adder circuit for calculating the volume and an interpolation.
  • the value of that volume corresponds to each value of the interpolation or each value of the fuel injection.
  • the present invention includes memory means for memorizing basic values which correspond to each engine condition or any other condition relating to the needed purpose.
  • the value of the interpolation can be calculated by adding these basic values in a predetermined order.
  • the computing device of the present invention is very simple and of low price.
  • the present invention is very suitable for a control device of a car engine or other engine.
  • the memory means and the adder means of the present invention are of the digital type so as to be independent of circumferential temperatures. If the memorized data is changed, it can be used for other purposes or as a controlling device of other kinds of car engines without any regulation.
  • the controlling devices for various kinds of car engines are provided in one kind of continuous design and continuous manufacturing process.
  • FIG. 1 is a diagram of a surface of a group of values determined by independent variations x x x and yr yz y..-
  • FIG. 2 is a partially enlarged view of desired values of independent variations of FIG. 1.
  • FIG. 3 is a partially enlarged view of desired values of FIG. 1 for graphical solution of an interpolation process.
  • FIG. 4 is a partially enlarged view of desired values of FIG. 1 for an electrical solution of an interpolation process.
  • FIG. 5 is a schematic block diagram of an electrical computing device for calculating an interpolation of values.
  • FIG. 6 is a schematic circuit diagram of an embodiment of the control circuit of the computing device of FIG. 5.
  • FIG. 7 is a schematic circuit diagram of another em bodiment of the computing device for calculating an interpolation.
  • FIG. 8 is a schematic circuit diagram of another embodiment of the control circuit of the computing device of FIG. 7.
  • a needed value 2 is a function of two independent variables x and y.
  • the needed value x is obtained by an experiment or an experience and has a surface as shown in FIG. 1. Setting values on the X-coordinate and the Y- coordinate, we can find the desired value 2 on the surface. If the x value is x, and the y value is y,, the desired value z has the value of point P. All of the values which are determined by the two independent variables x and y are found on this surface, as shown in FIG. 1, if it is assumed that all of the conditions being determined by the independent variables x and y are tested. But in practice, it is impossible to test all of the conditions. Thus, it is necessary to select basic values of the independent variables x and y with a certain distance along the X- and Y-coordinates via, x x x,, and y,, y
  • the calculating methodof the present invention is explained using FIGS. 2, 3, and 4. It is assumed that the distances between the selected values on the X- and Y coordinate axes are 6x and 8y, respectively.
  • the value of P which is the number 2, on the Z-axis obtained by dropping a perpendicular to the Z-axis from the point P, is obtained by approximation within the plane from the values z 2 z,-,- and 2
  • the values 2 z z,-,- and z are memorized by the memory.
  • the increment K of line L is obtained by the increments K 1 and K as follows where a (y,I yfllfiy.
  • the volume V is obtained by multiplying an area defined y Points p yp), i yr) 1 yp) d i, y;) by the value 2 of point (x y;); the volume V is obtained by multiplying an area defined by point (x,,, y,-),- (x y,), A and A; by the value of point (x y,); the volume V is obtained by multiplying an area defined by points (x y,,), (A A;,), (x,, y by the value of point (x y and the volume V is obtained by multiplying an area defined by point (x,, y,), A A and A by the value of point (x y Equation (7) is given by the total of the volumes V,-,-, V,,-, V,, and V But in reality, the equation (7) is given by the value which is obtained by dividing the total of the volumes by the area defined by 8x'8y. Since the certain area 6x'8y is multiplied by any
  • the values of points (x,-, y,-), (x,, y,), (x;, y,), (x,, y,-) are memorized in a memory means.
  • the selected values of independent variations x x x,, and y,, y y correspond to the addresses of the memory means.
  • the distance between two selected values of independent variations x and y are also divided into the many increments Ax Ax Ax and Ay Ay Ay,,.
  • the independent variations x and y are the values x,, and y,
  • the read out point is scanned from the first position of point p(x,,, y,,) to a point A, or a point A through a small area defined by Ax,, Ax Ax,,, Ay Ay Ay,,.
  • the read out point is located at a small area (Ax Ay the value of point (x,-, y,) is added by the adder means and when the read out point is shifted to the next small area (Ax Ay the value of point (x;, y,) is also added.
  • the independent variations for example, the rotational speed of the car engine and the suction value of an intake manifold, are converted to digital signals by sensors 1, 2 and are set in counters 10, 11 through AND gates 3, 4 and OR gates 5, 6, the operation of said AND gates 3, 4 is controlled by signals from a terminal T of a control circuit 7.
  • the counters and 11 consist of an upper counter and a lower counter.
  • the outputs of the upper counters are used for selecting an address of a memory 12 having two selecting input terminals T and T
  • the lower outputs of counters l0 and 11 count a small divided increment Ax Ax Ax Ay1.Ay Ay,. between the selected variation x x x,,, y,, y y,,. Therefore, the address corresponding to point (x,, y;) is selected by the upper counters of counters l0 and 11.
  • the output terminal T of the control circuit 7 starts the transfer of pulses into a counter 8 and input terminal T of counter 11.
  • the value z of the point (x;, y,) is applied to a terminal T of an adder circuit 14 and the value of a register 15 is also applied to a terminal 15 of the adder circuit 14.
  • the value of the register 15 is zero
  • the value z of the point (x,-, y is stored in the register 15 as the output of the adder circuit 14.
  • the counters 8 and 11 are advanced one count by the pulse from the terminal T of the control circuit 7, so that the scanning (read out) point is advanced to point (x,,, y
  • the read out address of the memory is not changed because the upper counters connected to the address inputs T and T of the memory are not advanced.
  • the same value 2 of the point (X1, y,) is read out for adding with the value in the register 15.
  • the resulting value calculated by adder circuit 14 is stored in the register as a new value.
  • the scanning (read out) point is moved to a point (x,,, Ay the upper counter of the counter 11 is advanced one count by the output of the lower counter of the counter 11.
  • the memorized value 2,; of the point (x,, y,) is read out from the memory 12 to register 13.
  • the value z of the register 13 is added with the value of the register 15 and then stored in the register 15 as a new value.
  • the scanning (read out) point reaches a point (x,,, Ay,,)
  • the counter 8 counts a full count and then it is reset and counters 9 and 10 are advanced one count.
  • the comparator 16 and the register 17 are shown as an auxiliary circuit. Namely, if the output of this computing device indicates the advancing angle, an instantaneous position of an engine piston is set into the re gister instantaneously. When the value in the register coincides with the value of the register 15, the comparator 16 derives an output, by which the ignition is triggered.
  • a counter can be used instead of the register 17 in order to obtain the instantaneous position of the piston by counting pulses generated in response to the position of the piston.
  • the instantaneous injecting quantity of the fuel is obtained by counting pulses, the
  • the output of the comparator is caused by coincidence of the value of the counter or register 17 and applied to a control device for the fuel injection valve so that the fuel injection is stopped.
  • the control circuit 7 is shown in FIG. 6 in detail.
  • a pulse is applied to a terminal ST, or ST by another circuit or an operator for setting a flip-flop FF
  • the output of flip-flop FF is used for clearing the counters 8, 9, l and 11 and the registers 13 and 15.
  • Next pulse from an oscillator 70 sets a flip-flop FF whereby the pulses from the oscillator 70 are applied to the counter 8 and the OR gate 6 until the output from the counter 9 is applied to an input of an AND gate 69 through the terminal T
  • Digital signals are set into counters 10 or 10' and 11 in FIG. 7 from sensors 1 or 1' and 2, respectively.
  • the value of the address determined by the counting values of counters l0 and 11 is transmitted to the input terminal of the adder 14 from the memory 12 through the register 13 in order to add to the value in the register 15.
  • the adder circuit 14 accumulates the output data from the memory 12 in response to the signal of the control circuit 7.
  • the desired calculation is completed and the calculated value is stored in the register 15.
  • the comparators l6 and 16' and registers 17 and 17' operate in the same way as shown in FIG. 5. Counters can be also used instead of the registers 17 and 17.
  • the sensor 1 measures the suction of the intake manifold of the engine
  • the sensor 1' measures the throttle opening of the engine
  • the sensor 2 measures the rotating speed of the engine.
  • the injecting fuel quantity is calculated from the measured values of sensor l and sensor 2.
  • the advancing angle is calculated from the measured values of sensor 1 and sensor 2.
  • F l0. 8 shows an embodiment of the control circuit of F IG. 1.
  • a pulse is applied to a terminal ST or ST and a flip-flop F F is set.
  • the output of the flip-flop FF is transmitted to set flip-flops F F, and FF and to clear the counters 8, 9, 10, 10' and 11 and the registers 13 and 15.
  • the output of flip-flop FF is transmitted to the AND gates 3, 3, 20 and 20'.
  • the output of the flip-flop F F is transmitted to the AND gates 3, 3', and 4 through a terminal T
  • the pulses of the oscillator 70 are derived from a terminal T of an AND gate 69 by setting a flip-flop FF
  • the AND gate 69 is closed by the output from the counter 9 of FIG. 7.
  • the foregoing disclosure relates to the interpolation of two independent variations. If the independent variations are three or four, at first, the interpolation is caused between two independent variations of these variations in the above explained way, and the interpolation is caused between the resultant value and next variations. The desired result is obtained by repeat of this operation.
  • a computing device for interpolation of values comprising digital memory means for memorizing data corresponding to selected values (x x x,,, y,, y y,,) of variations of the values (x, y), address control means connected to said digital memory means for reading out needed data from said memory means, input means connected to said address control means for setting certain values of said variations of (x, y) into said address control means, adder circuit means connected to said memory means for accumulating said output data of said memory means, and control circuit means for controlling said input means, said address control means and said adder circuit means, whereby at first certain values along said variations being set into said address control means and then said needed data to be accumulated are read out and the read out address of said memory means is shifted continuously by operation of said address control means, wherein said address control means comprises a plurality of address counters providing counted values which define said read out address, each of said address counters providing each of said certain values of said variations (x, y) from said input means, and wherein each of said address counters
  • a computing device for interpolation of values comprising digital memory means for memorizing data corresponding to selected values of two kinds of variables (x, y), first counting means for selecting the read out address of said memory in response to a certain value y, of said first variable (y), second counting means for selecting the read out address of said memory in response to a second certain value x of said second variable (x), input means for setting said first and second certain values (x,,, y,,) into said first and second counting means, respectively, adder means for accumulating the output of said memory, third counter means for providing a signal defining the shifted distance of the read out address along said first variable (y), fourth counter means for providing a signal defining the shifted distance of the read out address along said second variable (x), and control means for providing pulse signals for operating said input means and for shifting said read out address.
  • said input means includes sensor means responsive to selected operating conditions for providing corresponding digital values representing said variables of (x, y) and gating means responsive to said control circuit means for applying said digital values to said address control means.
  • a computing device for interpolation of variables comprising input means for receiving the variables
  • digital memory means having a plurality of storage locations designated by respective addresses for memorizing data corresponding to selected values of the variables
  • address control means for selecting an address of said memory means in response to the output from said input means and for reading out needed data from the storage location designated by said selected address of the memory.
  • digital adder means for summing the output data from said memory means
  • first counting means for counting increments of the variables between the selected values of the variables
  • control means for advancing said first counting means in synchronization with the summing timing of said digital adder means and for controlling said address control means to shift the readout address of said memory means when the counting values of the first counting means reaches the predetermined values.
  • address control means including two counting means for receiving the first and second digital signals from said input means, each of said counting means including upper counting means and lower counting means, each unit advance of said upper and lower counting means corresponding to each selected value and each increment of the variables respectively, said upper and lower counting means being connected so that when the lower counting means is advanced to a predetermined count the upper counting means is advanced according to the counting value of the upper counting means,
  • adder means for accumulating the output data from said memory means in synchronization with said lower counting means
  • control means for controlling said input means, said address control means and said adder means.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Optimization (AREA)
  • Data Mining & Analysis (AREA)
  • Combustion & Propulsion (AREA)
  • Computational Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Analysis (AREA)
  • Theoretical Computer Science (AREA)
  • Pure & Applied Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mechanical Engineering (AREA)
  • Algebra (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • Signal Processing (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Feedback Control In General (AREA)
  • Complex Calculations (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
US00334401A 1972-02-21 1973-02-21 Computing device for an interpolation Expired - Lifetime US3846625A (en)

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JP (1) JPS549257B2 (US20030199744A1-20031023-C00003.png)
DE (1) DE2308562C3 (US20030199744A1-20031023-C00003.png)
GB (1) GB1413045A (US20030199744A1-20031023-C00003.png)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953715A (en) * 1973-08-03 1976-04-27 Societe Des Procedes Modernes D'injection Sopromi Control apparatus and process for combustion engines
US3953716A (en) * 1973-08-28 1976-04-27 Agence Nationale De Valorisation De La Recherche (Anvar) Control apparatus and process for combustion engines
US3996456A (en) * 1975-02-13 1976-12-07 Armco Steel Corporation Recursive interpolation
US4001565A (en) * 1974-06-25 1977-01-04 Nippon Soken, Inc. Digital interpolator
US4009378A (en) * 1973-12-07 1977-02-22 Hitachi, Ltd. Ignition timing control system for an internal combustion engine
US4107717A (en) * 1975-11-18 1978-08-15 Robert Bosch Gmbh Method and apparatus for addressing a digital memory
US4114573A (en) * 1976-01-28 1978-09-19 Hitachi, Ltd. Electronic ignition timing control device for internal combustion engines
US4254470A (en) * 1977-08-22 1981-03-03 Sybron Corporation Interpolating digital data processing apparatus for correlation-type flow measurement
FR2500183A1 (fr) * 1981-02-18 1982-08-20 Bosch Gmbh Robert Procede et dispositif pour l'adaptation de grandeurs caracteristiques mises en memoire, dans des appareillages electroniques de commande, notamment pour des moteurs a combustion interne
EP0109675A2 (en) * 1982-11-22 1984-05-30 Hitachi, Ltd. Electronic ignition control system
EP0372113A1 (de) * 1988-12-07 1990-06-13 Siemens Aktiengesellschaft Verfahren zur Ermittlung der einer Brennkraftmaschine zuzuführenden Kraftstoffmenge
US6553394B1 (en) * 2000-01-21 2003-04-22 Mitsubishi Electric Research Laboratories, Inc. Continuous memoization

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2303182A1 (de) * 1973-01-23 1974-07-25 Siemens Ag Einrichtung zum steuern einer verbrennungskraftmaschine
JPS5077733A (US20030199744A1-20031023-C00003.png) * 1973-11-15 1975-06-25
JPS5077734A (US20030199744A1-20031023-C00003.png) * 1973-11-15 1975-06-25
JPS5096723A (US20030199744A1-20031023-C00003.png) * 1973-12-28 1975-08-01
DE2426976A1 (de) * 1974-06-04 1976-02-05 Wolfgang Klein Elektronische benzineinspritzung
JPS5162276A (en) * 1974-11-26 1976-05-29 Fujitsu Ltd Fuiido batsukuseigyohoshiki
JPS5265721U (US20030199744A1-20031023-C00003.png) * 1975-11-10 1977-05-16
JPS5245358A (en) * 1976-06-09 1977-04-09 Hitachi Ltd Device for determining normal values of plant data
JPS53137344A (en) * 1977-04-14 1978-11-30 Nippon Soken Inc Internal combustion engine ignition time adjustor
JPS54124124A (en) * 1978-02-27 1979-09-26 Bendix Corp Electronic control device for reciprocating piston internal combustion engine and method of controlling internal combustion engine related to same
JPS6122844Y2 (US20030199744A1-20031023-C00003.png) * 1979-10-09 1986-07-09
US4348590A (en) * 1980-10-27 1982-09-07 General Electric Company X-ray tube anode voltage compensator
US4471449A (en) * 1980-11-03 1984-09-11 Hewlett-Packard Company Scan converter system
US4468747A (en) * 1980-11-03 1984-08-28 Hewlett-Packard Company Scan converter system
DE3240318A1 (de) * 1982-10-30 1984-05-03 Fichtel & Sachs Ag, 8720 Schweinfurt Reibungskupplung mit zentrierter membran- bzw. tellerfeder
JPS606044A (ja) * 1983-06-22 1985-01-12 Honda Motor Co Ltd 内燃エンジン用燃料噴射装置の制御方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3110802A (en) * 1957-08-03 1963-11-12 Emi Ltd Electrical function generators
US3483364A (en) * 1967-09-12 1969-12-09 Woodward Governor Co Electrical 3d cam
US3676655A (en) * 1970-07-31 1972-07-11 Chandler Evans Inc Digital function generator for two independent variables with interpolation
US3689755A (en) * 1969-09-23 1972-09-05 Lucas Industries Ltd Engine control systems
US3689753A (en) * 1969-09-23 1972-09-05 Lucas Industries Ltd Engine control systems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3110802A (en) * 1957-08-03 1963-11-12 Emi Ltd Electrical function generators
US3483364A (en) * 1967-09-12 1969-12-09 Woodward Governor Co Electrical 3d cam
US3689755A (en) * 1969-09-23 1972-09-05 Lucas Industries Ltd Engine control systems
US3689753A (en) * 1969-09-23 1972-09-05 Lucas Industries Ltd Engine control systems
US3676655A (en) * 1970-07-31 1972-07-11 Chandler Evans Inc Digital function generator for two independent variables with interpolation

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953715A (en) * 1973-08-03 1976-04-27 Societe Des Procedes Modernes D'injection Sopromi Control apparatus and process for combustion engines
US3953716A (en) * 1973-08-28 1976-04-27 Agence Nationale De Valorisation De La Recherche (Anvar) Control apparatus and process for combustion engines
US4009378A (en) * 1973-12-07 1977-02-22 Hitachi, Ltd. Ignition timing control system for an internal combustion engine
US4001565A (en) * 1974-06-25 1977-01-04 Nippon Soken, Inc. Digital interpolator
US3996456A (en) * 1975-02-13 1976-12-07 Armco Steel Corporation Recursive interpolation
US4107717A (en) * 1975-11-18 1978-08-15 Robert Bosch Gmbh Method and apparatus for addressing a digital memory
US4114573A (en) * 1976-01-28 1978-09-19 Hitachi, Ltd. Electronic ignition timing control device for internal combustion engines
US4254470A (en) * 1977-08-22 1981-03-03 Sybron Corporation Interpolating digital data processing apparatus for correlation-type flow measurement
FR2500183A1 (fr) * 1981-02-18 1982-08-20 Bosch Gmbh Robert Procede et dispositif pour l'adaptation de grandeurs caracteristiques mises en memoire, dans des appareillages electroniques de commande, notamment pour des moteurs a combustion interne
EP0109675A2 (en) * 1982-11-22 1984-05-30 Hitachi, Ltd. Electronic ignition control system
EP0109675A3 (en) * 1982-11-22 1986-02-19 Hitachi, Ltd. Electronic ignition control system
EP0372113A1 (de) * 1988-12-07 1990-06-13 Siemens Aktiengesellschaft Verfahren zur Ermittlung der einer Brennkraftmaschine zuzuführenden Kraftstoffmenge
US5060160A (en) * 1988-12-07 1991-10-22 Siemens Aktiengesellschaft Method for calculating the quantity of fuel to be supplied to an internal combustion engine
US6553394B1 (en) * 2000-01-21 2003-04-22 Mitsubishi Electric Research Laboratories, Inc. Continuous memoization

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Publication number Publication date
DE2308562B2 (de) 1979-09-27
JPS549257B2 (US20030199744A1-20031023-C00003.png) 1979-04-23
DE2308562A1 (de) 1973-09-27
DE2308562C3 (de) 1980-06-19
GB1413045A (en) 1975-11-05
JPS4885927A (US20030199744A1-20031023-C00003.png) 1973-11-14

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