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Loading method for vehicle bench test simulation road test transient conditions

A transient working condition and road test technology, applied in vehicle testing, machine/structural component testing, measuring devices, etc., to achieve the effect of reducing equipment costs

Active Publication Date: 2014-10-22
路亚科消防车辆制造有限公司
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AI Technical Summary

Problems solved by technology

The three methods (2), (3) and (4) need to determine the road test resistance and bench test resistance of the vehicle to be checked, and also need to determine the equivalent inertia of the rotating parts of the vehicle to be checked, and the operability is not good

Method used

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Examples

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Embodiment Construction

[0022] 1. Borrow the coefficient a=7.1N, b=0.0481 corresponding to the vehicle reference mass of 1350kg in Table CB.1 of the standard GB18352.3-2005 "Light Vehicle Pollutant Emission Limits and Measurement Methods (China Phase III, IV)", F=7.1+0.0481×V 2 , the table is the recommended power absorbed by the dynamometer versus load.

[0023] 2. The loading force F at the specified constant speed of 15km / h, 32km / h, 35km / h, 50km / h 15 =7.1+0.0481×15 2 =17.9N, F 32 =56.4N, F 35 =66.0N,F 50 =127.4N, the number in the subscript is the speed of the vehicle, and the load is controlled by constant force.

[0024] 3. In the accelerated working condition of the operation cycle process 2 of the transient working condition method, the acceleration A=1.04m / s is stipulated 2 , when the vehicle speed is 10km / h, the required F 10=7.1+0.0481×10 2 +(1350-900)×1.04=11.91+468=479.9N, F at different speed points g different.

[0025] 4. In the process of accelerating from 15km / h to 32km / h i...

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Abstract

The invention relates to a vehicle bench test simulation road test transient condition loading method. According to test statistics, a formula of a difference of a road test system resistance formula and a bench test system resistance formula of vehicle neutral gear sliding in different reference quality ranges is obtained; there is no need to test a detected vehicle or calculate system resistance of the road test and the bench test. The vehicle reference quality is used to replace the sum of a vehicle translation quality and a correlated revolving member equivalent inertia and there is no need to measure the correlated revolving member equivalent inertia of the detected vehicle. When constant-speed condition simulation is carried out, the formula of the road test system resistance and bench test system resistance formula difference is used to determine a loading force to carry out constant force control; and when accelerated condition simulation is carried out, product of a difference between the vehicle reference quality and a stand basic quality and a regulated accelerated speed is added; and speed changing and loading force changing are employed to control loading.

Description

technical field [0001] The invention discloses a vehicle bench test simulation road test transient working condition loading method, which is a method for loading a power absorbing device on a chassis dynamometer of a car or a motorcycle when simulating a road test transient working condition, and belongs to the technical field of vehicle performance bench test detection methods. Background technique [0002] As the requirements for energy saving and emission reduction of vehicles are getting higher and higher, the bench test is used to simulate the transient working conditions of the road test to detect the fuel consumption or exhaust emissions of automobiles or motorcycles. The transient working conditions include idling, acceleration, constant speed and deceleration conditions. , more comprehensively and accurately reflect the fuel consumption or exhaust emissions of the vehicle on the actual road. There are three types of inertial flywheels for chassis dynamometers used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M17/007
Inventor 吴明
Owner 路亚科消防车辆制造有限公司
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