GB869365A - Improvements relating to electronic apparatus for measuring speed - Google Patents
Improvements relating to electronic apparatus for measuring speedInfo
- Publication number
- GB869365A GB869365A GB972157A GB972157A GB869365A GB 869365 A GB869365 A GB 869365A GB 972157 A GB972157 A GB 972157A GB 972157 A GB972157 A GB 972157A GB 869365 A GB869365 A GB 869365A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- diode
- transistor
- instrument
- charge
- 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
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
869,365. Electrical measuring systems. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. June 20, 1958 [March 25, 1957], No. 9721/57. Class 40 (1). [Also in Group XL (c)] Apparatus for measuring the speed of rotation of the shaft of an I.C. engine comprises a capacitor having a voltage limiting device connected across it, the capacitor being alternately charged through a circuit and discharged through a transistor under control of the contact breaker associated with the ignition coil. In Fig. 2, the transistor T is cut-off when the contact breaker CB is closed. This allows the capacitor C2 to charge via resistor R1, diode D4 and an instrument M until the voltage across the Zener diode Z is reached when the charge is limited by the catching diode D5. Capacitor C2 discharges through the transistor T each time the contact breaker CB opens, the instrument M being by-passed for discharge current by the diode D3. Resistors R6, R7, R8 are provided to compensate for variation in the charging current with supply voltage variation. In a simpler transistor circuit (Fig. 1, not shown), both the charge and discharge current is measured by a rectifier instrument, the Zener diode Z being connected across the collector and emitter electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB972157A GB869365A (en) | 1957-03-25 | 1957-03-25 | Improvements relating to electronic apparatus for measuring speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB972157A GB869365A (en) | 1957-03-25 | 1957-03-25 | Improvements relating to electronic apparatus for measuring speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB869365A true GB869365A (en) | 1961-05-31 |
Family
ID=9877487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB972157A Expired GB869365A (en) | 1957-03-25 | 1957-03-25 | Improvements relating to electronic apparatus for measuring speed |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB869365A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1224068B (en) * | 1964-10-14 | 1966-09-01 | Hartmann & Braun Ag | Circuit arrangement for measuring the speed of an Otto engine from the frequency of a signal alternating voltage supplied by the ignition device of the Otto engine |
| DE1245184B (en) * | 1961-10-17 | 1967-07-20 | Smith & Sons Ltd S | Speedometer for internal combustion engines |
-
1957
- 1957-03-25 GB GB972157A patent/GB869365A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1245184B (en) * | 1961-10-17 | 1967-07-20 | Smith & Sons Ltd S | Speedometer for internal combustion engines |
| DE1224068B (en) * | 1964-10-14 | 1966-09-01 | Hartmann & Braun Ag | Circuit arrangement for measuring the speed of an Otto engine from the frequency of a signal alternating voltage supplied by the ignition device of the Otto engine |
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