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Rear axle efficiency test method based on NEDC (New European Driving Cycle) oil consumption working conditions

An efficiency test and rear axle technology, applied in the transmission field, can solve the problems of too many working points and too large deviation between the simulation results and the measured results, and achieve the effect of predicting the impact and reducing the number of

Inactive Publication Date: 2019-04-05
SAIC-GM-WULING AUTOMOBILE CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that too many working condition points need to be selected for testing in the existing rear axle efficiency test method, and the deviation between the simulation result and the actual measurement result is too large

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  • Rear axle efficiency test method based on NEDC (New European Driving Cycle) oil consumption working conditions
  • Rear axle efficiency test method based on NEDC (New European Driving Cycle) oil consumption working conditions
  • Rear axle efficiency test method based on NEDC (New European Driving Cycle) oil consumption working conditions

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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] The present invention provides a kind of rear axle efficiency testing method based on NEDC fuel consumption operating condition, and described method comprises the following steps:

[0029] Step S1: read the speed data, torque data and the oil temperature data of the rear axle in the NEDC fuel consumption condition test or the simulation result of the input end;

[0030] Preferably, the sampling frequency of the input speed, torque and oil temperature data of the rear axle in the step S1 should be the same. The frequency of data sampling in the step S1 does not exceed 10 Hz.

[0031] The most important point of a test method is the validity of the test data. In this test method, the sampling of the input speed, torque and oil temperature da...

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Abstract

The invention is suitable for the technical field of transmission and provides a rear axle efficiency test method based on NEDC (New European Driving Cycle) oil consumption working conditions. The method comprises the steps of reading the rotation speed data and torque data of an input end and oil temperature data of a rear axle in the NEDC oil consumption working condition test and simulation result; respectively establishing a relation image among the rotation speed data, the torque data, the oil temperature data and test time; performing two-dimensional frequency statistics on the rotationspeed data and the torque data according to the relation image, and calculating the time ratio; making statistics of working condition points with the time ratio of greater than 1%, and reading the statistical working condition points through a rear axle component rack; and calculating the comprehensive efficiency of the rear axle by use of the abovementioned data. With the test method, the numberof test working condition points is decreased, meanwhile, the simulation result obtained by the method are closer to the actually measured result, and the influence of the rear axle efficiency on theoil consumption of the whole vehicle is accurately predicted so that a better supplier is selected.

Description

technical field [0001] The invention belongs to the technical field of transmission, and in particular relates to a rear axle efficiency test method based on NEDC fuel consumption conditions. Background technique [0002] The rear axle assembly is an important part of the power transmission of a front-mounted rear-drive vehicle or a mid-mounted rear-drive vehicle, and its transmission efficiency has a crucial impact on the fuel consumption of the vehicle. Therefore, a practical and efficient test method can allow manufacturers to better choose. In the prior art, the efficiency test method of the rear axle assembly is carried out according to the efficiency Map test method or the simplified efficiency test method in SAE standard SAE_J1266-2001. The Efficiency Map test method has a total of 180 test operating points, which are composed of a matrix of three variables: input torque, input speed, and lubricating oil temperature: input torque is 0%, 10%, 15%, and 25% of the maxim...

Claims

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Application Information

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IPC IPC(8): G01M17/007G01F9/00
CPCG01F9/00G01M17/007
Inventor 满兴家杨章晖何卫梁玮蒋华梁
Owner SAIC-GM-WULING AUTOMOBILE CO LTD
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