JPS57189071A - Display driver for digital speedometer - Google Patents

Display driver for digital speedometer

Info

Publication number
JPS57189071A
JPS57189071A JP7466581A JP7466581A JPS57189071A JP S57189071 A JPS57189071 A JP S57189071A JP 7466581 A JP7466581 A JP 7466581A JP 7466581 A JP7466581 A JP 7466581A JP S57189071 A JPS57189071 A JP S57189071A
Authority
JP
Japan
Prior art keywords
car speed
value
output
car
displaying
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.)
Pending
Application number
JP7466581A
Other languages
Japanese (ja)
Inventor
Kazuo Yukitomo
Tadashi Iwamoto
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.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
Toyo Kogyo Co 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 Mazda Motor Corp, Toyo Kogyo Co Ltd filed Critical Mazda Motor Corp
Priority to JP7466581A priority Critical patent/JPS57189071A/en
Publication of JPS57189071A publication Critical patent/JPS57189071A/en
Pending 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
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/489—Digital circuits therefor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)

Abstract

PURPOSE:To eliminate a flicker of display during a constant-speed run and answer delay during acceleration and deceleration by displaying the mean movement value of a car speed signal when the variation rate of the signal is below a certain value, and displaying the signal as it is when the rate is above a certain value. CONSTITUTION:A car speed sensor 1 outputs car speed pulses whose number is in proportion to the speed of a car. A car speed counter 4 counts the car speed pulses inputted through a gate 2 which is opened and closed by the output of an oscillator 3, and outputs the result to a mean value circuit 5 and a car speed register 6. The mean value circuit 5 input (n) pieces of the count values to find their mean value. The car speed register 6, on the other hand, latches the car speed every time the count value is inputted. Then, an acceleration discriminating circuit 7 compares both the values to select the output of the mean value circuit 5 during a stable run, namely, when the variation rate of the car speed is below a certain value, or the output of the car speed register 6 during acceleration or deceleration, namely, when the rate is above the certain value, thereby displaying the selected output on a display device 9.
JP7466581A 1981-05-18 1981-05-18 Display driver for digital speedometer Pending JPS57189071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7466581A JPS57189071A (en) 1981-05-18 1981-05-18 Display driver for digital speedometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7466581A JPS57189071A (en) 1981-05-18 1981-05-18 Display driver for digital speedometer

Publications (1)

Publication Number Publication Date
JPS57189071A true JPS57189071A (en) 1982-11-20

Family

ID=13553750

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7466581A Pending JPS57189071A (en) 1981-05-18 1981-05-18 Display driver for digital speedometer

Country Status (1)

Country Link
JP (1) JPS57189071A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920859A (en) * 1982-07-27 1984-02-02 Mitsubishi Heavy Ind Ltd Apparatus for measuring rotational speed fluctuation
JPS6047964A (en) * 1983-08-26 1985-03-15 Mitsubishi Electric Corp Car speed detecting apparatus
JPH0378946U (en) * 1989-12-04 1991-08-12
JP2006287492A (en) * 2005-03-31 2006-10-19 Sunx Ltd Detection sensor
JP6139722B1 (en) * 2016-02-19 2017-05-31 ヤフー株式会社 Estimation apparatus, estimation method, and estimation program

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5920859A (en) * 1982-07-27 1984-02-02 Mitsubishi Heavy Ind Ltd Apparatus for measuring rotational speed fluctuation
JPH0376427B2 (en) * 1982-07-27 1991-12-05 Mitsubishi Jukogyo Kk
JPS6047964A (en) * 1983-08-26 1985-03-15 Mitsubishi Electric Corp Car speed detecting apparatus
JPH0378946U (en) * 1989-12-04 1991-08-12
JP2006287492A (en) * 2005-03-31 2006-10-19 Sunx Ltd Detection sensor
JP6139722B1 (en) * 2016-02-19 2017-05-31 ヤフー株式会社 Estimation apparatus, estimation method, and estimation program
JP2017146279A (en) * 2016-02-19 2017-08-24 ヤフー株式会社 Estimation device, estimation method, and estimation program

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