GB1251374A - - Google Patents

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Publication number
GB1251374A
GB1251374A GB1251374DA GB1251374A GB 1251374 A GB1251374 A GB 1251374A GB 1251374D A GB1251374D A GB 1251374DA GB 1251374 A GB1251374 A GB 1251374A
Authority
GB
United Kingdom
Prior art keywords
pulse
transducer
circuit
gate
vehicle
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
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 filed Critical
Publication of GB1251374A publication Critical patent/GB1251374A/en
Expired legal-status Critical Current

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Classifications

    • 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

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

1,251,374. Frequency measuring. INVICTA PLASTICS Ltd. 9 May, 1969 [9 Feb., 1968], No. 6453/68. Heading H3A. [Also in Division G1] A transducer 1<SP>1</SP>, produces a train of pulses, of which the frequency is proportional to the speed of a vehicle, to an audible and/or visible warning means which is actuated in the event of the vehicle reaching a predetermined speed. The pulse train is fed through an inverting amplifier 4 to a gate 6 which emits a pulse when the pulse train from the inverting amplifier is coincident with that from a monostable circuit 5 of which the pulse frequency is preset to represent the speed at which a warning signal is given to the driver of the vehicle. Each pulse from the gate 6 is lengthened to a duration of one second by a monostable circuit 7 and passed to a delay device which produces a slowly decaying signal so that the transistor switch circuit 8 is held on continuously for output pulses from the gate having less than a one second interval between each pulse. The switch circuit actuates a loudspeaker. Alternatively a transducer 1 may produce an A.C. signal which is converted to a D.C. square wave by an amplifier and Schmitt trigger circuit. A detailed circuit diagram is given in Fig. 3 (not shown). The transducer 1<SP>1</SP> may be a reed switch actuated by a rotatable magnet or as illustrated in Fig. 1 (not shown) a transducer 1 of a generally-known pick-up coil construction may be used.
GB1251374D 1968-02-09 1968-02-09 Expired GB1251374A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB645368 1968-02-09

Publications (1)

Publication Number Publication Date
GB1251374A true GB1251374A (en) 1971-10-27

Family

ID=9814745

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1251374D Expired GB1251374A (en) 1968-02-09 1968-02-09

Country Status (1)

Country Link
GB (1) GB1251374A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2931622A1 (en) * 1979-08-03 1981-02-12 Aral Ag Optimum gear changing threshold indicator for automobile engine - is for ensuring min. fuel consumption and uses ignition pulses to represent actual rotation rate
DE3040226A1 (en) * 1979-10-24 1981-05-07 Nissan Motor Co., Ltd., Yokohama, Kanagawa ACOUSTIC INFORMATION AND WARNING DEVICE FOR MOTOR VEHICLES WITH SPEED CONTROL UNIT
GB2146861A (en) * 1983-09-14 1985-04-24 Plessey Co Plc Digital frequency discriminator
GB2193826A (en) * 1986-08-14 1988-02-17 Nittan Co Ltd Environmental abnormality detection apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2931622A1 (en) * 1979-08-03 1981-02-12 Aral Ag Optimum gear changing threshold indicator for automobile engine - is for ensuring min. fuel consumption and uses ignition pulses to represent actual rotation rate
DE3040226A1 (en) * 1979-10-24 1981-05-07 Nissan Motor Co., Ltd., Yokohama, Kanagawa ACOUSTIC INFORMATION AND WARNING DEVICE FOR MOTOR VEHICLES WITH SPEED CONTROL UNIT
GB2146861A (en) * 1983-09-14 1985-04-24 Plessey Co Plc Digital frequency discriminator
GB2193826A (en) * 1986-08-14 1988-02-17 Nittan Co Ltd Environmental abnormality detection apparatus
GB2193826B (en) * 1986-08-14 1990-04-25 Nittan Co Ltd Environmental abnormality detection apparatus

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee