US3908614A - Throttle angle transducers - Google Patents

Throttle angle transducers Download PDF

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Publication number
US3908614A
US3908614A US33209173A US3908614A US 3908614 A US3908614 A US 3908614A US 33209173 A US33209173 A US 33209173A US 3908614 A US3908614 A US 3908614A
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Prior art keywords
throttle
oscillator
output
angle
frequency
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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 - Lifetime
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John Michael Ironside
Michael Herbert Cops
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Lucas Electrical Co Ltd
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Lucas Electrical Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/15Mounting arrangements for bearing-shields or end plates
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14Means for supporting or protecting brushes or brush holders
    • H02K5/143Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H02K5/148Slidably supported brushes

Abstract

A throttle angle transducer having a non-linear output which changes more rapidly at small throttle angles than at large throttle angles, comprises a linear potentiometer operated by the throttle pedal, and an oscillator having a period which is determined by the potentiometer output and which varies linearly from the throttle angle. The frequency of the oscillator is employed to provide the required output from a transducer.

Description

United States Patent Ironside et a].

THROTTLE ANGLE TRANSDUCERS Inventors:

Assignee:

Filed:

Appl. No.:

John Michael lronside, Birmingham; Michael Herbert Cops, Solihull, both of England Lucas Electrical Company Limited, Birmingham, England Feb. 13, 1973 Foreign Application Priority Data Feb. 25. 1972 US. CL... int. CL

United Kingdom 8937/72 123/32 EA; 123/119 R Field of Search 123/119 R, 132 EA References Cited UNITED STATES PATENTS TRANSDUCER Aono et al 123/32 EA MEMORY i i DEl/ICE 51 Sept. 30, 1975 3,703,162 11/1972 Aono 123/32 EA 3.719.176 3/1973 Shinoda et al. 123/32 EA 1765.380 10/1973 Rachel et al. 123/32 EA 3,786,788 1/1974 Suda et al 123/32 EA Primary E.\'aminer-Charles J. Myhre Assistant Examiner-Joseph A. C angelosi Attorney, Agent, or Firm-Holman & Stern [57] ABSTRACT 1 Claim, 4 Drawing Figures FUEL INJECTION CO NTROL w '5 OSCILLATORS ,is ,e

idem NETWORK LATCHING COUNTER -COUNTER LOGIC =:?TNETW0RK F? El US. Patent Sept. 30,1975 3,908,614

MEMORY FUEL \NJECTION TRANSDUCER DEVICE CONTROL IE IS T LATGHING COUNTER COUNTER mm W QWETWoRK 0SClLLAT0RS I7 g /l 9 E NETWORK PERIOD Flea.

THROTTLE ANGLE EFFECTIVE FREQUENCY FREQUENCY THEGTTLE ANGLE- THEOTTLE ANGLE FTC-3.3. FIGA.

THROTTLE ANGLE TRANSDUCERS This invention relates to throttle angle transducers for use in fuel injection systems.

In order to attain satisfactory accuracy in a fuel injection system, it is desirable to employ a throttle angle transducer having a non-linear output which changes more rapidly at small throttle angles than at large throttle angles, because at small throttle angles the rate of change of flow of air when the pedal is moved is substantially higher than at large throttle angles. The desired output can be obtained by employing a nonlinear potentiometer, but such potentiometers are expensive and difficult to manufacture to the required degree of accuracy.

The invention resides in a throttle angle transducer having a non-linear output which changes more rapidly at small throttle angles than at large throttle angles, comprising a linear potentiometer operated by the throttle pedal, and an oscillator having a period which is determined by the potentiometer output and varies linearly with the position of the throttle pedal, and the frequency of the oscillator being employed to provide the required output from the transducer.

Preferably, the frequency is measured digitally by using a counting device to count to a value representing the frequency at any given instant, and in this case the shape of the frequency against throttle angle curve can be changed to suit any particular application by subtracting a fixed digital number from each digital count.

The invention further resides in a fuel injection system for a vehicle, including a throttle angle transducer as specified above, a second transducer for measuring a further engine parameter, and a memory device to which the outputs from the transducers are fed, the memory device determining the quantity of fuel injected in accordance with the values of the two parameters.

An example of the invention is illustrated in the accompanying drawings, in which:

FIG. 1 is a block diagram, and

FIGS. 2 to 4 are graphs illustrating roughly wave forms pertinent to the example.

Referring first to FIG. 1, there is provided a memory device 11 which receives an electrical input from a transducer 12 representing either engine speed or manifold depression, and receives a further electrical input from a latching counter 13 in a manner to be described, the input from the counter 13 to the memory device 11 representing throttle angle. The memory device 1 1 produces an output, the value of which is dependent on the values of the two input signals it receives, and this output is used to operate means 14 for controlling the injection of fuel to the engine ofa road vehicle. The exact nature of the memory device 11 is not important for an understanding of the present invention.

In order to obtain a signal representing a throttle angle, there is provided a potentiometer 15 which produces a linear output, that is to say a voltage which varies linearly with throttle angle. The signal obtained from the slider of the potentionmeter 15 is fed to a freerunning square wave oscillator 16 of any convenient form, the arrangement being such that the signal received by the oscillator 16 from the potentiometer l5 varies the period of the oscillator, so that the period of the oscillator varies with throttle angle in a linear manner as indicated in FIG. 2. It will be appreciated that since the frequency of an oscillator is inversely proportional to its period, then the frequency of the oscillator 16 will vary with throttle angle in the manner shown in FIG. 3.

The output from the oscillator 16 is fed to a counter 17 which passes a signal to the counter 13 from time to time in a manner to be explained. The circuit also includes a fixed frequency oscillator 18 which has a period substantially in excess of the period of the oscillator 16. In one particular example, the period of the oscillator 18 is equal to the time taken for the oscillator 16 to produce 32 pulses, even when the oscillator 16 is operating at its minimum frequency. The output from the oscillator 18 is fed to a logic network 19, and at the commencement of a period of oscillation of the oscillator 18, the logic network produces one output pulse which is applied to the counter 13 so that the counter 13 is fed with the information which at that moment is present in the counter 17. The counter 13 then retains this information until the beginning of the next period of the oscillator 18. Moreover, at the commencement of the period of the oscillator 18, the logic network 19 produces a further pulse which clears the counter 17, which then starts to receive a count from the oscillator 16. After the counter 17 has received 32 pulses, a further logic network 21 clears the counter 17 again, but the counter 17 then starts filling again by virtue of further pulses received from the counter 16. Thus, it will be seen that at the end of a period of the oscillator 18, when the reading of the counter 17 will be passed onto the counter 13, the reading in the counter 17 will represent the number of pulses received from the oscillator 16 during the fixed period of the oscillator 18, less 32 pulses by virtue of the logic network 21. The effect of subtracting these 32 pulses from the reading of the counter 17 is that the graph shown in FIG. 3 effectively becomes of the form shown in FIG. 4. It will be seen that this graph is of the form required, in that the effective frequency shown in FIG. 4, that is to say the frequency after allowance is made for the 32 subtracted pulses, varies with throttle angle in such a manner that at small throttle angles the signal received by the counter 13 will change more rapidly than at large throttle angles.

We claim:

1. A throttle angle transducer which can be used in a fuel injection system for a vehicle having a throttle pedal, and which has a nonlinear output which changes more rapidly at small throttle angles than at large throttle angles, said transducer comprising in combination a linear potentiometer having movable thereon a slider which is driven by the throttle pedal which determines said throttle angle, an oscillator, means coupling said oscillator to said slider, said potentiometer determining the period of said oscillator, whereby said period varies linearly with the position of said slider, and an output stage coupled to said oscillator, said output stage providing an output signal which varies linearly with the frequency of the oscillator, the frequency of said oscillator being determined solely by its period, said output stage effecting digital measurement of said oscillator frequency and including means comprising a digital counting device for counting to a value representing the oscillator frequency at any given instance, the shape of the frequency against the throttle angle curve being determined by the output of means for subtracting a fixed digital number from each digital count.

. UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3,908,614

' DATE I September 30, 1975 INVENT0R(5) I John M. Ironside, et a1 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

[30] Forelgn PIlOIltY Data:

Great Britain No. 8925/72 filed February 25, 1972 Signed and Scaled this thir Day Of January 1976 [SEAL] Attest:

RUTH c. MASON C. MARSHALL DANN Arresting ffic Commissioner ufPatenls and Trademarks

Claims (1)

1. A throttle angle transducer which can be used in a fuel injection system for a vehicle having a throttle pedal, and which has a nonlinear output which changes more rapidly at small throttle angles than at large throttle angles, said transducer comprising in combination a linear potentiometer having movable thereon a slider which is driven by the throttle pedal which determines said throttle angle, an oscillator, means coupling said oscillator to said slider, said potentiometer determining the period of said oscillator, whereby said period varies linearly with the position of said slider, and an output stage coupled to said oscillator, said output stage providing an output signal which varies linearly with the frequency of the oscillator, the frequency of said oscillator being determined solely by its period, said output stage effecting digital measurement of said oscillator frequency and including means comprising a digital counting device for counting to a value representing the oscillator frequency at any given instance, the shape of the frequency against the throttle angle curve being determined by the output of means for subtracting a fixed digital number from Each digital count.
US3908614A 1972-02-25 1973-02-13 Throttle angle transducers Expired - Lifetime US3908614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB892572A GB1422775A (en) 1972-02-25 1972-02-25 Fuel injection systems

Publications (1)

Publication Number Publication Date
US3908614A true US3908614A (en) 1975-09-30

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ID=9861975

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Application Number Title Priority Date Filing Date
US3908614A Expired - Lifetime US3908614A (en) 1972-02-25 1973-02-13 Throttle angle transducers

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US (1) US3908614A (en)
DE (1) DE2308908C3 (en)
ES (1) ES411866A1 (en)
FR (1) FR2173001A1 (en)
GB (1) GB1422775A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983851A (en) * 1974-03-18 1976-10-05 Hitachi, Ltd. Electronic fuel injection apparatus
US4168679A (en) * 1976-09-03 1979-09-25 Nissan Motor Company, Limited Electrically throttled fuel control system for internal combustion engines
US4266522A (en) * 1976-11-04 1981-05-12 Lucas Industries Limited Fuel injection systems
US4280465A (en) * 1980-07-16 1981-07-28 Brunswick Corporation Throttle control for an electronic fuel-injection control circuit
US4377145A (en) * 1979-09-27 1983-03-22 Nissan Motor Co., Ltd. Intake vacuum sensing system with correction device for an internal combustion engine
US4711219A (en) * 1986-07-24 1987-12-08 Brunswick Corporation Throttle-position signal generator for an electronic fuel-injection system
US4977880A (en) * 1988-02-05 1990-12-18 Weber S.R.L. System for converting a signal from a linear transducer for enabling parameter acquisition to varying degrees of accuracy
US5419294A (en) * 1990-09-28 1995-05-30 Lucas Industries Public Limited Company Load compensating fuel system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS629742B2 (en) * 1977-04-22 1987-03-02 Hitachi Ltd
DE2843456C2 (en) * 1978-10-05 1984-11-15 Vdo Adolf Schindling Ag, 6000 Frankfurt, De
JPS6062638A (en) * 1983-09-16 1985-04-10 Mazda Motor Corp Fuel injection device of engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673989A (en) * 1969-10-22 1972-07-04 Nissan Motor Acceleration actuating device for fuel injection system
US3703162A (en) * 1969-10-22 1972-11-21 Nissan Motor Fuel shutoff device for internal combustion engine
US3719176A (en) * 1969-07-29 1973-03-06 Toyota Motor Co Ltd Electric fuel injection control system for internal combustion engines
US3765380A (en) * 1971-08-10 1973-10-16 Bendix Corp Electronic fuel control systems with nonlinearizing circuit means interconnecting the pressure transducer with the main computation means
US3786788A (en) * 1972-05-24 1974-01-22 Nippon Denso Co Fuel injection apparatus for internal combustion engine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1127146B (en) * 1957-12-07 1962-04-05 Bosch Gmbh Robert Injection system for internal combustion engines, particularly for motor vehicles
DE1751330B1 (en) * 1968-05-11 1971-01-07 Bosch Gmbh Robert Electrically controlled fuel injection system for internal combustion engines
ES376338A1 (en) * 1969-02-14 1972-09-01 Sibe Improvements in devices for feeding fuel internal combustion engines.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719176A (en) * 1969-07-29 1973-03-06 Toyota Motor Co Ltd Electric fuel injection control system for internal combustion engines
US3673989A (en) * 1969-10-22 1972-07-04 Nissan Motor Acceleration actuating device for fuel injection system
US3703162A (en) * 1969-10-22 1972-11-21 Nissan Motor Fuel shutoff device for internal combustion engine
US3765380A (en) * 1971-08-10 1973-10-16 Bendix Corp Electronic fuel control systems with nonlinearizing circuit means interconnecting the pressure transducer with the main computation means
US3786788A (en) * 1972-05-24 1974-01-22 Nippon Denso Co Fuel injection apparatus for internal combustion engine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983851A (en) * 1974-03-18 1976-10-05 Hitachi, Ltd. Electronic fuel injection apparatus
US4168679A (en) * 1976-09-03 1979-09-25 Nissan Motor Company, Limited Electrically throttled fuel control system for internal combustion engines
US4266522A (en) * 1976-11-04 1981-05-12 Lucas Industries Limited Fuel injection systems
US4377145A (en) * 1979-09-27 1983-03-22 Nissan Motor Co., Ltd. Intake vacuum sensing system with correction device for an internal combustion engine
US4280465A (en) * 1980-07-16 1981-07-28 Brunswick Corporation Throttle control for an electronic fuel-injection control circuit
US4711219A (en) * 1986-07-24 1987-12-08 Brunswick Corporation Throttle-position signal generator for an electronic fuel-injection system
US4977880A (en) * 1988-02-05 1990-12-18 Weber S.R.L. System for converting a signal from a linear transducer for enabling parameter acquisition to varying degrees of accuracy
US5419294A (en) * 1990-09-28 1995-05-30 Lucas Industries Public Limited Company Load compensating fuel system

Also Published As

Publication number Publication date Type
GB1422775A (en) 1976-01-28 application
DE2308908A1 (en) 1973-09-06 application
ES411866A1 (en) 1976-01-01 application
FR2173001A1 (en) 1973-10-05 application
DE2308908B2 (en) 1980-06-04 application
DE2308908C3 (en) 1981-05-07 grant

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