GB919421A - Improved rate indicating device - Google Patents

Improved rate indicating device

Info

Publication number
GB919421A
GB919421A GB407059A GB407059A GB919421A GB 919421 A GB919421 A GB 919421A GB 407059 A GB407059 A GB 407059A GB 407059 A GB407059 A GB 407059A GB 919421 A GB919421 A GB 919421A
Authority
GB
United Kingdom
Prior art keywords
circuit
mono
capacitor
input
stable circuit
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
GB407059A
Inventor
Vernon Arthur Sheridan
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.)
B P L INSTR Ltd
Original Assignee
B P L INSTR Ltd
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 B P L INSTR Ltd filed Critical B P L INSTR Ltd
Priority to GB407059A priority Critical patent/GB919421A/en
Publication of GB919421A publication Critical patent/GB919421A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

919,421. Frequency measurement; semiconductor pulse Circuits. B.P.L. (INSTRUMENTS) Ltd. Nov. 18, 1959 [Feb. 5, 1959; May 26, 1959], Nos. 4070/59 and 17923/59. Classes 40 (5) and 40 (6). [Also in Groups XXXVIII and XL (b)] A rate meter particularly for use in the determination of the shaft speed of an I.C. engine (see Groups XXXVIII, XL (b)) comprises a mono-stable circuit consisting of transistors T1, T2 having collector and base interconnected by a capacitor C1 and resistor R2 respectively characterized in the provision of an R.F. input filter C2L1 to filter out all but the required input pulses. The circuit is triggered at each input pulse derived from the sparking of the engine so that transistor T1 becomes conducting and C1 is charged, thus causing a pulse on the base of transistor T2 to cut the latter off, when the capacitor C1 discharges through resistor R2, thus returning the mono-stable circuit to its original condition. The output from the mono-stable circuit derived across capacitor C3 is rectified and the mean current measured in a meter M, said mean current being proportional to the rate of the input pulses. In order to prevent the mono-stable circuit from being triggered by ignition pulses in the battery circuit, a further filter L2, C4 is included in the circuit.
GB407059A 1959-02-05 1959-02-05 Improved rate indicating device Expired GB919421A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB407059A GB919421A (en) 1959-02-05 1959-02-05 Improved rate indicating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB407059A GB919421A (en) 1959-02-05 1959-02-05 Improved rate indicating device

Publications (1)

Publication Number Publication Date
GB919421A true GB919421A (en) 1963-02-27

Family

ID=9770170

Family Applications (1)

Application Number Title Priority Date Filing Date
GB407059A Expired GB919421A (en) 1959-02-05 1959-02-05 Improved rate indicating device

Country Status (1)

Country Link
GB (1) GB919421A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3510809A (en) * 1967-05-16 1970-05-05 Itt Vehicle velocity indicator
US3581206A (en) * 1968-04-06 1971-05-25 Porsche Kg Electronically controlled speedometer with maximum speed indicator
US3590379A (en) * 1968-07-19 1971-06-29 Bernard F Fellerman Monostable multivibrator pulse frequency meters
US3614615A (en) * 1968-08-23 1971-10-19 Canadian Nat Railway Co Railway vehicle speed indication system
FR2507782A1 (en) * 1981-06-16 1982-12-17 Valeo Tachometer for DC motor in vehicle air conditioner - has current transformer and wave shaping circuit for transients caused by commutations induced in transformer secondary
EP0223109A1 (en) * 1985-10-26 1987-05-27 WILO-Werk GmbH & Co. Pumpen- und Apparatebau Centrifugal pump or ventilator
GB2204688A (en) * 1987-05-16 1988-11-16 Danfoss As Rotary machine with measuring means for measuring the angle of rotation
US5001937A (en) * 1989-11-06 1991-03-26 Tacan Corporation Optically based torsion sensor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3510809A (en) * 1967-05-16 1970-05-05 Itt Vehicle velocity indicator
US3581206A (en) * 1968-04-06 1971-05-25 Porsche Kg Electronically controlled speedometer with maximum speed indicator
US3590379A (en) * 1968-07-19 1971-06-29 Bernard F Fellerman Monostable multivibrator pulse frequency meters
US3614615A (en) * 1968-08-23 1971-10-19 Canadian Nat Railway Co Railway vehicle speed indication system
FR2507782A1 (en) * 1981-06-16 1982-12-17 Valeo Tachometer for DC motor in vehicle air conditioner - has current transformer and wave shaping circuit for transients caused by commutations induced in transformer secondary
EP0223109A1 (en) * 1985-10-26 1987-05-27 WILO-Werk GmbH & Co. Pumpen- und Apparatebau Centrifugal pump or ventilator
GB2204688A (en) * 1987-05-16 1988-11-16 Danfoss As Rotary machine with measuring means for measuring the angle of rotation
US5001937A (en) * 1989-11-06 1991-03-26 Tacan Corporation Optically based torsion sensor

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