GB1495309A - Frequency responsive switching circuit - Google Patents

Frequency responsive switching circuit

Info

Publication number
GB1495309A
GB1495309A GB4400175A GB4400175A GB1495309A GB 1495309 A GB1495309 A GB 1495309A GB 4400175 A GB4400175 A GB 4400175A GB 4400175 A GB4400175 A GB 4400175A GB 1495309 A GB1495309 A GB 1495309A
Authority
GB
United Kingdom
Prior art keywords
monostable
output
circuit
state
time constant
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
Application number
GB4400175A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Motor Co Ltd
Ford Motor Co
Original Assignee
Ford Motor Co Ltd
Ford Motor Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Motor Co Ltd
Publication of GB1495309A publication Critical patent/GB1495309A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/4802—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage by using electronic circuits in general
    • G01P3/4807—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage by using electronic circuits in general by using circuits for the detection of the pulses delivered by the ignition system of an internal combustion engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/002—Electric control of rotation speed controlling air supply
    • F02D31/006—Electric control of rotation speed controlling air supply for maximum speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M3/00—Idling devices for carburettors
    • F02M3/06—Increasing idling speed
    • F02M3/07—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • G01P1/07—Indicating devices, e.g. for remote indication
    • G01P1/08—Arrangements of scales, pointers, lamps or acoustic indicators, e.g. in automobile speedometers
    • G01P1/10—Arrangements of scales, pointers, lamps or acoustic indicators, e.g. in automobile speedometers for indicating predetermined speeds
    • G01P1/106—Arrangements of scales, pointers, lamps or acoustic indicators, e.g. in automobile speedometers for indicating predetermined speeds by comparing the time duration between two impulses with a reference time

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

1495309 Transistor pulse circuits FORD MOTOR CO Ltd 27 Oct 1975 [8 Jan 1975] 44001/75 Heading H3T [Also in Division Fl] A frequency responsive switching circuit comprises a first monostable 144 including a timing circuit P1, R6, C4, the output of the first monostable being coupled to the input of a second monostable 146 which includes a timing circuit R9, C6 and means R12, D5 for modifying the time constant of the timing circuit of the first monostable in dependence on the state of the second monostable. In one state of the second monstable, output terminal 9 is at a high level and diode D5 is conductive to connect resistor R12 in parallel with series connected potentiometer P1 and resistor R6. In this state, the time constant of the first monostable is 1/f 1 where f 1 is 125 Hz. In the other state of the second monostable, the diode D5 is non-conducting and the time constant of the first monostable is 1/f 0 where f 0 is 123 Hz. If an input pulse train at 114 from a car ignition coil 136, 138 is lower than f 0 , the first monostable 144 completes its timing cycle for each input pulse to provide triggering pulses for the second monostable 146. These pulses maintain the monostable 146 in its unstable state with output 9 high and diode D5 conductive. In this condition transistor Q3 is conductive to hold transistor Q4 off an inhibit operation of a solenoid (not shown) in the collector circuit of Q4. If the frequency of the input pulse train increases above f 1 , monostable 144 cannot complete its timing cycle before it is reset by a reset pulse on 4 and its output remains at a high level except during reset pulses at 4. Time constant circuit C5, R7 removes these pulses from the output so that input 8 of the second monostable 146 remains at a high level and the monostable 146 times out. Output 9 then falls to a low level cutting off transistor Q3 to turn on Q4 and energize the solenoid (not shown) in its collector circuit. When output 9 falls, diode D5 is also cut-off changing the time constant of the first monostable 144 to provide hysteresis, since the input frequency must fall to below f 0 before the circuit reverts to its initial state. The solenoid prevents the throttle of a vehicle being completely closed when the engine speed is above a predetermined level.
GB4400175A 1975-01-08 1975-10-27 Frequency responsive switching circuit Expired GB1495309A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US53957175 US3914619A (en) 1975-01-08 1975-01-08 Frequency responsive switching circuit

Publications (1)

Publication Number Publication Date
GB1495309A true GB1495309A (en) 1977-12-14

Family

ID=24151799

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4400175A Expired GB1495309A (en) 1975-01-08 1975-10-27 Frequency responsive switching circuit

Country Status (4)

Country Link
US (1) US3914619A (en)
CA (1) CA1033421A (en)
DE (1) DE2600281C2 (en)
GB (1) GB1495309A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081694A (en) * 1976-08-23 1978-03-28 Ford Motor Company Circuit for detecting the occurrence of a predetermined input frequency
US4274376A (en) * 1976-09-20 1981-06-23 Colt Industries Operating Corp. Governor apparatus and system
DE2723371A1 (en) * 1977-05-24 1978-11-30 Bosch Gmbh Robert SPEED LIMITING DEVICE
US4176633A (en) * 1978-02-14 1979-12-04 Colt Industries Operation Corp. Governor apparatus and system
FR2459373A1 (en) * 1979-06-19 1981-01-09 Renault METHOD OF REDUCING THE EMISSION OF HARMFUL GAS FROM A CARBURETTOR INTERNAL COMBUSTION ENGINE DURING DECELERATION PERIOD AND APPARATUS USING THE SAME
US4383506A (en) * 1979-12-28 1983-05-17 Hitachi, Ltd. Engine rotation speed control system
US5208519A (en) * 1991-02-07 1993-05-04 Briggs & Stratton Corporation Electronic speed governor
SE470527B (en) * 1992-11-18 1994-07-04 Ericsson Telefon Ab L M Method and apparatus for detecting whether or not a signal has a desired predetermined frequency
US5605130A (en) * 1994-04-15 1997-02-25 Briggs & Stratton Corporation Electronic governor having increased droop at lower selected speeds
US5524588A (en) * 1994-04-15 1996-06-11 Briggs & Stratton Corporation Electronic speed governor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1526503B1 (en) * 1966-11-03 1971-03-04 Bosch Gmbh Robert Fuel injection system
US3645241A (en) * 1970-04-16 1972-02-29 Gen Motors Corp Bistable throttle control system

Also Published As

Publication number Publication date
DE2600281C2 (en) 1986-10-16
CA1033421A (en) 1978-06-20
US3914619A (en) 1975-10-21
DE2600281A1 (en) 1976-07-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee