JPS57135362A - Electronic speed indicator for vehicle - Google Patents

Electronic speed indicator for vehicle

Info

Publication number
JPS57135362A
JPS57135362A JP2084481A JP2084481A JPS57135362A JP S57135362 A JPS57135362 A JP S57135362A JP 2084481 A JP2084481 A JP 2084481A JP 2084481 A JP2084481 A JP 2084481A JP S57135362 A JPS57135362 A JP S57135362A
Authority
JP
Japan
Prior art keywords
speed
extent
display
decided
variation
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
JP2084481A
Other languages
Japanese (ja)
Inventor
Masao Ishikawa
Masahiro Adachi
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP2084481A priority Critical patent/JPS57135362A/en
Publication of JPS57135362A publication Critical patent/JPS57135362A/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

Abstract

PURPOSE:To reduce an error against an actual speed even when a speed has been varied remarkably like a car speed, by decreasing the hysteresis width of a hysteresis characteristic provided so as to shift a switching level of speed display at the time of acceleration and deceleration, in case when the extent of variation of speed has exceeded a prescribed value. CONSTITUTION:When detecting a speed which is varied remarkably like a car speed or an engine rotation speed, the extent of variation DELTAv of a car speed in 1 sampling period is calculated by comparing its sampling speed. Subsequently, whether¦DELTAv¦of this DELTAv exceeds a prescribed extent v0 (for instance, 2km/hr by 2 times of speed display unit) or not is decided. When it exceeds, it is decided to be a sudden acceleration or deceleration state, and a speed display signal inputted by an actual car speed display characteristic V(T)=V0[v(T)]is outputted. On the other hand, when said extent of variation is below the prescribed extent, it is decided to be a very small speed variation, subsequently whether DELTA is positive or negative is decided, a display car speed decided by an acceleration or deceleration characteristic is compared with a display car speed before 1 sampling period, and a larger or smaller car speed is outputted. In this way, since a hysteresis characteristic is varied in accordance with the extent of variation of speed, a speed display error against the actual speed is reduced.
JP2084481A 1981-02-17 1981-02-17 Electronic speed indicator for vehicle Pending JPS57135362A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2084481A JPS57135362A (en) 1981-02-17 1981-02-17 Electronic speed indicator for vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2084481A JPS57135362A (en) 1981-02-17 1981-02-17 Electronic speed indicator for vehicle

Publications (1)

Publication Number Publication Date
JPS57135362A true JPS57135362A (en) 1982-08-20

Family

ID=12038379

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2084481A Pending JPS57135362A (en) 1981-02-17 1981-02-17 Electronic speed indicator for vehicle

Country Status (1)

Country Link
JP (1) JPS57135362A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103529241A (en) * 2013-10-23 2014-01-22 成都市宏山科技有限公司 Interface circuit for acceleration sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103529241A (en) * 2013-10-23 2014-01-22 成都市宏山科技有限公司 Interface circuit for acceleration sensor

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