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Determination method of engine factor of vehicle diesel engine

A determination method and engine technology, applied in the direction of internal combustion engine testing, etc., can solve problems such as inability to calculate, difficulty in knowing technical parameters, wrong detection and wrong judgment, etc.

Active Publication Date: 2018-09-04
路亚科消防车辆制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The prior art calculates the power correction coefficient a of the diesel engine according to the national standard GB / T18276-2000 "Automotive Power Bench Test Method and Evaluation Index", wherein the engine factor fm is a function of the corrected specific displacement circulating oil supply qc, and The unit of qc is milligrams per cycle per liter of total cylinder working volume, that is, qc is related to technical parameters of fuel consumption, speed, and cylinder volume. Diesel vehicles in use usually detect power or fuel economy at the rated power speed point or the maximum torque speed point or exhaust emissions, when it is necessary to calculate the power correction coefficient a, it is often difficult to know these relevant technical parameters and cannot be calculated
When the diesel vehicle is loaded and decelerated to detect exhaust emissions, set fm=1.2 too large, fm is an index when calculating a, and fm is too large to cause a large error in the value of a.

Method used

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Examples

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Embodiment Construction

[0014] Taking a certain type of diesel engine as an example to illustrate the specific implementation of the method for determining the engine factor of a diesel engine for vehicles, the rated power of the diesel engine is 243kW, the rated speed is 2200r / min, L=8.424 liters, the maximum torque is 1230N m, and the maximum torque speed is 1400r / min , the air intake mode is pressurized and intercooled, r=2.2, find the rated power coordinate point from its universal characteristic curve, and use the interpolation method to calculate the fuel consumption rate ge=222g / kW·h at this point, and get it from the performance parameters The minimum fuel rate of full load gd=205g / kW·h, calculate ke=ge / gd=222 / 205=1.08.

[0015] (2) At the rated power vehicle speed Ve point, qce=33.33×1.08×gd×Pe / (ne×L×r)=36.0×gd×Pe / (ne×L×r)=36.0×205×243 / (2200 ×8.424×2.2)=43.98, fm=0.036×43.98-1.14=0.44.

[0016] (3) At the maximum torque vehicle speed Vm point, Pm=1230×1400 / 9549=180.3kW, find the maximum tor...

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Abstract

The invention provides a determination method of a vehicle diesel engine factor. From a universal characteristic curve of various vehicle diesel engines, the ratio of the fuel consumption rate of a rated power point or a maximum torque point to the full-load minimum fuel consumption rate is calculated, an equation of the corrected displacement-specific fuel delivery per cycle qc and the fuel consumption, rotational speed and cylinder volume is established, and the full-load qc values of various vehicle diesel engines are statistically analyzed and calculated. According to the statistics result, a fixed engine factor fm is selected between 0.3 and 0.6, or the fixed fm can be decided according to structural characteristics or load condition characteristics of a diesel engine. The rotational speed, displacement, suction method or other technical parameters of the tested vehicle diesel engine are not needed for determining and calculating the diesel engine power correction coefficient value.

Description

technical field [0001] The method for determining the engine factor of a vehicle diesel engine is a method for detecting and calculating the power correction coefficient of a standard environment state at the rated power speed point or the maximum torque speed point of the diesel vehicle, and counting and determining the engine factor, which belongs to the technical field of vehicle performance detection methods. Background technique [0002] The prior art calculates the power correction coefficient a of the diesel engine according to the national standard GB / T18276-2000 "Automotive Power Bench Test Method and Evaluation Index", wherein the engine factor fm is a function of the corrected specific displacement circulating oil supply qc, and The unit of qc is milligrams per cycle per liter of total cylinder working volume, that is, qc is related to technical parameters of fuel consumption, speed, and cylinder volume. Diesel vehicles in use usually detect power or fuel economy a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/04
Inventor 吴明
Owner 路亚科消防车辆制造有限公司