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Detection Method of Loading Deceleration Engine Speed

A technology of engine speed and detection method, which is applied in the direction of engine testing, speed/acceleration/shock measurement, linear/angular velocity measurement, etc. It can solve poor detection accuracy, wrong detection and judgment of engine speed, poor operability of installing tachometer sensor, etc. problems, to achieve the effect of improving detection efficiency, reducing fluctuations and errors

Active Publication Date: 2016-05-25
TAIZHOU JIEXIN MACHINERY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using an engine tachometer to measure the speed of a diesel engine has a contradiction between operability and accuracy. If an engine tachometer with high accuracy is used for measurement, the operability of installing a tachometer sensor is very poor; if an adsorption sensor with better operability is used Vibration sensor, the detection accuracy is poor
In testing practice, it is often difficult to know the rated speed of the diesel engine in the manual of the inspected vehicle, and it is easy to input the wrong rated speed, resulting in a large number of wrong detections and judgments of the engine speed

Method used

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Experimental program
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specific Embodiment approach

[0011] 1. If Ve is determined according to the model series statistics of the national standard GB18565-2001 "Comprehensive Performance Requirements and Inspection Methods for Commercial Vehicles", get Ve = 85km / h from the direct gear rated power reference speed in Table 1, and register the correct engine rating in the manual. The speed is 2400r / min.

[0012] 2. When the measured vehicle speed Vi=75km / h, the corresponding engine speed ni=75×2400 / 85=2118r / min. The measured vehicle speed in the direct gear maximum wheel power steady state is 72.6km / h, then the corresponding engine speed n 72.6 =72.6×2400 / 85=0.854×2400=2050r / min. If you do not know the engine rated speed in the manual of the bus, you can log in the manual rated engine speed ne, n 72.6 =72.6×ne / 85=0.854×ne, record the engine speed with the weight coefficient of the rated engine speed in the manual.

[0013] 3. According to the provisions of J.4.5.5 of the national standard GB3847-2005 "Vehicle Compression Ignit...

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Abstract

The invention discloses a detection method for revolving speed of a loaded geared-down engine. The detection method comprises the steps of converting corresponding revolving speed of the engine by measuring the speed of a car, firstly determining the speed Ve corresponding to the rated revolving speed of the engine in the specified gear instruction book of the detected vehicle, obtaining a weight coefficient Ki=Vi / Ve when the speed is measured as Vi, calculating to obtain the engine revolving speed ni corresponding to Vi, and regardless of whether the logged engine rated revolving speed is correct, accurately evaluating a ratio between the engine revolving speed corresponding to specified state speed point and the engine rated revolving speed by using the weight coefficient Ki, without the need of installing an engine revolving speed sensor to measure the engine revolving speed, so that the accuracy and operability can be greatly improved, and the method is suitable for detection stations for detection and evaluation on the engine revolving speed of massive in-use vehicles.

Description

technical field [0001] The invention relates to a detection method for engine speed under load and deceleration, which is a detection method for converting vehicle speed into engine speed when a diesel vehicle is loaded and decelerated on a chassis dynamometer to detect exhaust emissions, and belongs to the technical field of automobile performance bench test detection methods. Background technique [0002] In order to ensure that the technical parameters of the diesel engine used for loading and decelerating exhaust emission detection are normal, and to prevent the throttle from being too small or the fuel supply volume from being too small, not only the limited value of the wheel power, but also the limited value of the engine speed are required. The existing technology requires measurement Generator speed at each speed point. Using an engine tachometer to measure the speed of a diesel engine has a contradiction between operability and accuracy. If an engine tachometer wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/00G01M15/00
Inventor 吴明
Owner TAIZHOU JIEXIN MACHINERY EQUIP