GB1110523A - Improvements in or relating to tachometers for engines - Google Patents

Improvements in or relating to tachometers for engines

Info

Publication number
GB1110523A
GB1110523A GB4369565A GB4369565A GB1110523A GB 1110523 A GB1110523 A GB 1110523A GB 4369565 A GB4369565 A GB 4369565A GB 4369565 A GB4369565 A GB 4369565A GB 1110523 A GB1110523 A GB 1110523A
Authority
GB
United Kingdom
Prior art keywords
current
meter
transistor
winding
engine
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
GB4369565A
Inventor
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 GB4369565A priority Critical patent/GB1110523A/en
Publication of GB1110523A publication Critical patent/GB1110523A/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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

1,110,523. Transistor blocking oscillators. SMITHS INDUSTRIES Ltd. 2 Jan., 1967 [14 Oct., 1965], No. 43695/65. Heading H3T. [Also in Division G1] In a tachometer for measuring the R.P.M. of an I.C. engine by means of a monostable blocking oscillator fed with pulses from the engine induction coil, the lead in the L.T. side of the coil is coupled to a saturable toroidal core 11 carrying windings 12, 13 which are connected with a transistor 18, causing collector current with each break, which is averaged by meter 25. Each cessation of current in primary winding 14 causes the positive core flux to drop, inducing a voltage in winding 12 which produces conduction in transistor 18, and the current through winding 13 escalates to produce core saturation in the negative direction. A current pulse thus passes through meter 25. When the contact breaker recloses the initial conditions are restored. Thus the average current indicated by meter 25 represents R.P.M. Temperature compensation is effected by thermistor 17, and the circuit is substantially independent of voltage variations.
GB4369565A 1965-10-14 1965-10-14 Improvements in or relating to tachometers for engines Expired GB1110523A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4369565A GB1110523A (en) 1965-10-14 1965-10-14 Improvements in or relating to tachometers for engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4369565A GB1110523A (en) 1965-10-14 1965-10-14 Improvements in or relating to tachometers for engines

Publications (1)

Publication Number Publication Date
GB1110523A true GB1110523A (en) 1968-04-18

Family

ID=10429901

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4369565A Expired GB1110523A (en) 1965-10-14 1965-10-14 Improvements in or relating to tachometers for engines

Country Status (1)

Country Link
GB (1) GB1110523A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992006384A1 (en) * 1990-10-01 1992-04-16 Actron Manufacturing Company Switch for electronic device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992006384A1 (en) * 1990-10-01 1992-04-16 Actron Manufacturing Company Switch for electronic device

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