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JJF 1375-2024 English PDF

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JJF 1375-2024: Calibration Specification for Motor Vehicle Engine Speed Measuring Instruments
Status: Valid

JJF 1375: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJF 1375-2024English319 Add to Cart 4 days [Need to translate] Calibration Specification for Motor Vehicle Engine Speed Measuring Instruments Valid JJF 1375-2024
JJF 1375-2012English639 Add to Cart 3 days [Need to translate] Calibration Specification for Motor Vehicle Engine Speed Measuring Instruments Obsolete JJF 1375-2012

Basic data

Standard ID JJF 1375-2024 (JJF1375-2024)
Description (Translated English) Calibration Specification for Motor Vehicle Engine Speed Measuring Instruments
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 15,110
Date of Issue 2024-09-18
Date of Implementation 2024-12-18
Issuing agency(ies) State Administration for Market Regulation

JJF 1375-2024: Calibration Specification for Motor Vehicle Engine Speed Measuring Instruments

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Metrology Technical Specifications of the People's Republic of China Specification for calibration of motor vehicle engine speed measuring instruments Released on 2024-09-18 Implementation on 2024-12-18 The State Administration for Market Regulation issued Motor vehicle engine speed measuring instrument Calibration Specifications Replaces JJF 1375-2012 Responsible unit. National Legal Metrology Management Metrology Technical Committee Motor Vehicle Inspection and Quarantine Scoring Technical Committee Main drafting unit. Anhui Institute of Metrology Gansu Institute of Metrology Xiamen Metrology Verification and Testing Institute Participating in the drafting. Shenzhen Dalei Automobile Inspection Co., Ltd. Zhejiang Zheda Mingquan Technology Co., Ltd. Shandong Institute of Metrology This specification is entrusted to the National Legal Metrology Management Metrology Technical Committee Motor Vehicle Inspection and Testing Technical Committee The committee is responsible for interpreting The main drafters of this specification are. Wu Anping (Anhui Institute of Metrology) Gao Decheng (Gansu Institute of Metrology) Jiang Tao (Xiamen Metrology Verification and Testing Institute) Participating drafters. Li Weike (Anhui Institute of Metrology) Chen Li (Shenzhen Dalei Automobile Inspection Co., Ltd.) Kangye (Zhejiang Zheda Mingquan Technology Co., Ltd.) Ma Xiao (Shandong Institute of Metrology)

Table of contents

Introduction (II) 1 Scope(1) 2 References(1) 3 Terminology (1) 4 Overview(1) 5 Metering characteristics (1) 5.1 Measuring range(1) 5.2 Resolution of display devices (2) 5.3 Indication error (2) 5.4 Repeatability (2) 5.5 Indication stabilization time (2) 6 Calibration conditions(2) 6.1 Environmental conditions(2) 6.2 Measurement standards and other equipment (2) 7 Calibration items and calibration methods (2) 7.1 Measuring range and resolution of display device (2) 7.2 Indication error (3) 7.3 Repeatability (3) 7.4 Indication stabilization time (4) 8 Calibration Certificate (4) 9 Recalibration interval (4) Appendix A Pulse-to-speed ratio of engines with different strokes and cylinder numbers (5) Appendix B. Format of the inner page of the speed measuring instrument calibration certificate (6) Appendix C Speed Meter Calibration Record Format (7) Appendix D Example of uncertainty assessment of measurement results of indication error of speed measuring instrument calibration (8)

Introduction

JJF 1071-2010 "Rules for the Preparation of National Measurement and Calibration Specifications", JJF 1001-2011 "General Measurement Terms and Definition” and JJF 1059.1-2012 “Evaluation and Expression of Uncertainty in Measurement” together constitute the basis for the revision of this specification. A series of basic specifications. This specification mainly refers to GB 18285-2018 "Gasoline vehicle pollutant emission limits and measurement methods (dual idle method) GB 3847-2018 "Emission limits and measurement methods for pollutants from diesel vehicles (free acceleration method and simplified working condition method)" Compared with the JJF 1375-2012 version, in addition to editorial revisions, the main changes are as follows. --- In the "Introduction", the following is deleted. "This specification mainly refers to JJG (Automobile) 04-1995 "Special Specifications for Gasoline Engines" Tachometer》 and JJG (Automobile) 05-1995 “Technical requirements for tachometer for diesel engine”. --- In the "Scope", the following is added. "Other non-road mobile diesel machinery engine speed measuring instruments can refer to this regulation Model implementation". --- In "Reference Documents", "JJG124-2005 Ammeter, Voltmeter, Power Meter and Resistor" was deleted. The referenced document was modified to GB 3847-2018 "Emission Limits and Measurement Methods of Pollutants from Diesel Vehicles (Free Addition)" Speed method and loaded deceleration method) and GB 18285-2018 "Gasoline vehicle pollutant emission limits and measurement methods (dual idle speed method and loaded deceleration method)" Method and Simple Working Condition Method)”. --- In "Terms and Units of Measurement", the definition of "3.1 Pulse-to-speed ratio" was modified, and the definition of "3.2 Needle Swing Amount". ---In "Overview", the classification of speed measuring instruments was adjusted and the "Speed measuring instruments can be classified according to display mode" was deleted. There are two types. pointer-type tachometers and digital display tachometers". --- In "Measuring Characteristics", the measuring range and indication error specified according to the measuring range were adjusted, and the pointer type was deleted. The requirements for speed measuring instruments have been expanded to include the "resolution of the display device" requirement and the "linearity error of the output voltage" requirement has been deleted. Poor" requirement. ---In "Calibration Conditions", the equipment name was modified, and the calibration device was added to the measurement standard and other equipment. Resolution, deleted "DC digital voltmeter". --- In "Calibration items and calibration methods", "Calibration of pointer swing of pointer-type speed measuring instrument" was deleted. Added "calibration of the resolution of the speed measuring instrument display device" and added when the speed measurement point is ≤1000r/min The calculation formula for the indication error of each calibration point and the calculation formula for the repeatability of each calibration point of the speed measuring instrument have been modified. --- Deleted "Appendix B Example of Calculation Method for Linear Error of Output Voltage of Speed Measuring Instrument". Previous versions of this specification are as follows. ---JJF 1375-2012. Specification for calibration of motor vehicle engine speed measuring instruments

1 Scope

This specification applies to the calibration of various measuring instruments for the speed of spark-ignition engines and compression-ignition engines of motor vehicles. The engine speed measuring instrument for road mobile diesel machinery can also be calibrated according to this specification.

2 References

This specification references the following documents. GB 3847-2018 Diesel vehicle pollutant emission limits and measurement methods (free acceleration method and loaded deceleration method) GB 18285-2018 Gasoline vehicle pollutant emission limits and measurement methods (dual idle method and simple operating condition method) For any referenced document with a date, only the version with the date is applicable to this specification; for any referenced document without a date, The latest version (including all amendments) shall apply to this specification.

3 Terminology

Pulse speed ratio pulsespeedratio The ratio of the number of pulses P to the number of engine speeds R is P/R when the engine has different strokes and cylinder numbers. Note. 1 For spark-ignition engines, the pulse number refers to the number of ignition pulses; for compression-ignition engines, the pulse number refers to the number of high-pressure fuel injections. 2 The pulse-speed ratios of engines with different strokes and numbers of cylinders are given in Appendix A. 3 The pulse-to-speed ratio is a dimensionless quantity.

4 Overview

The motor vehicle engine speed measuring instrument (hereinafter referred to as the speed measuring instrument) is used to measure the speed of the spark ignition engine of the motor vehicle. It is an instrument for measuring the speed of engines and compression ignition engines. It consists of sensors, signal processing systems, display devices, etc. According to the measurement principle, the speed measuring instrument can be divided into the following categories. ---Ignition pulse induction speed measuring instrument, which uses the ignition pulse of the ignition coil of the induction ignition engine to measure the ignition speed of the engine. Frequency measures the engine speed of a motor vehicle. ---Vibration and sound wave induction type (high pressure injection pulse induction type) speed measuring instrument, which senses the engine Vibration (including vibration caused by high-pressure fuel injection in compression ignition engines) and sound wave frequency measure engine speed. ---On-board battery electric pulse speed measuring instrument, which senses the battery voltage when the motor vehicle engine is running The pulsation frequency of the current or the pulsation frequency of the vehicle battery voltage caused by the ignition of the induction ignition engine (cigarette lighter type) Rate measures engine speed. 5.Metering characteristics 5.1 Measuring range

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