GB1105099A - Improvements in or relating to tachometers - Google Patents

Improvements in or relating to tachometers

Info

Publication number
GB1105099A
GB1105099A GB384766A GB384766A GB1105099A GB 1105099 A GB1105099 A GB 1105099A GB 384766 A GB384766 A GB 384766A GB 384766 A GB384766 A GB 384766A GB 1105099 A GB1105099 A GB 1105099A
Authority
GB
United Kingdom
Prior art keywords
coil
meter
series
ignition system
contact
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
GB384766A
Inventor
Henry Stewart Marro
Bernard Frederick Fellerman
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Priority to GB384766A priority Critical patent/GB1105099A/en
Publication of GB1105099A publication Critical patent/GB1105099A/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

Abstract

1,105,099. Measuring rotational speed electrically. SMITHS INDUSTRIES Ltd. Jan. 27, 1967 [Jan. 28, 1966], No.3847/66. Heading G1N. The rotational speed of the output shaft of an I. C. engine having a coil ignition system is determined by measuring the frequency of the pulses of current in the ignition system. A coil 11 of tape of a square loop, grain orientated, magnetic material is wound to form an annulus, carrying three windings 5, 12, 13, of which the primary windings 5, 12 are connected, one in series with the vehicle battery, and the other with the contact breaker 3, so that the annulus is saturated alternately in opposite directions. The current induced in the secondary coil 13 flows through a meter 16, in series with coil 13, only when the contact 3 is closed because of an avalanche diode 15 connected in series with the meter 16. As the coil 11 is saturated when the contact 3 is closed, the reading on the meter 16 is proportional to the frequency of the pulses in the ignition system and therefore to the rotation speed of the engine. A parallel arrangement of resistor 17 and thermistor 18 is also included in this circuit to compensate for effects of temperature changes.
GB384766A 1966-01-28 1966-01-28 Improvements in or relating to tachometers Expired GB1105099A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB384766A GB1105099A (en) 1966-01-28 1966-01-28 Improvements in or relating to tachometers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB384766A GB1105099A (en) 1966-01-28 1966-01-28 Improvements in or relating to tachometers

Publications (1)

Publication Number Publication Date
GB1105099A true GB1105099A (en) 1968-03-06

Family

ID=9766052

Family Applications (1)

Application Number Title Priority Date Filing Date
GB384766A Expired GB1105099A (en) 1966-01-28 1966-01-28 Improvements in or relating to tachometers

Country Status (1)

Country Link
GB (1) GB1105099A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4717670U (en) * 1971-03-30 1972-10-30
JPS5322482A (en) * 1976-08-13 1978-03-01 Hitachi Ltd Tachometer for eng ine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4717670U (en) * 1971-03-30 1972-10-30
JPS5322482A (en) * 1976-08-13 1978-03-01 Hitachi Ltd Tachometer for eng ine

Similar Documents

Publication Publication Date Title
GB1369404A (en) Method and device for measuring a stress employing magneto striction
GB1163039A (en) Apparatus for Detecting the Speed of Wheel Rotation.
GB1120379A (en) Electrical indicators
GB1105099A (en) Improvements in or relating to tachometers
GB1102792A (en) Alternator tachometer
GB1492264A (en) Magnetic speed sensor
GB1164770A (en) Distance and speed indicator system for a vehicle
GB936615A (en) Magnetic field sensing device
GB921177A (en) Motor control circuit
US3268811A (en) Tachometer employing a blocking oscillator including a saturable core
US3602817A (en) Electrical tachometer
US3011115A (en) Solid state regulated battery charging system
US3396333A (en) Odometer system for vehicles employing a frequency divider
GB1265599A (en)
GB1081503A (en) Three terminal bridged t. network for monitoring the operating speed of a motor
GB1237932A (en)
GB1296614A (en)
GB1078529A (en) Electrical frequency indicators
GB1234574A (en)
US3636451A (en) Tachometer circuit for an internal combustion engine or the like
US3324392A (en) Means for imparting a torque proportional to frequency to a biased indicator rotor
SU838571A1 (en) Rotational velocity transmitter
US3046481A (en) Tachometer
GB1000629A (en) Improvements in or relating to wattmeter circuit arrangements
GB1254486A (en) An electronically controllable speedometer