Heavy vehicle chassis dynamometer

Abstract

The invention discloses a heavy vehicle chassis dynamometer. A front roller shaft, a middle roller shaft and a rear roller shaft and three left rollers and three right rollers are adopted, each rear roller has a larger diameter so as to adapt to detecting dual drive axle vehicles with different axle bases, the front and middle rollers have the same diameter and have smaller diameter than the rearrollers, and the loading torque of a power absorption device is reduced. The front rollers are main rollers, the rear rollers are free rollers and play a role in supporting only, and the power absorption device is not assembled and is not coupled to the front and middle rollers in a speed ratio way. An inertia flywheel is not assembled, equivalent inertia of a rack is reduced, the loading response sensitivity of the system is improved, and the inertia power error is reduced; moreover, the detection accuracy, operability and safety are improved.

Description

technical field [0001] A heavy-duty vehicle chassis dynamometer is a double-roller chassis dynamometer with free rollers, which is suitable for heavy-duty vehicle bench testing of power performance, fuel economy performance, exhaust gas emission performance, and sliding performance, and belongs to the technical field of vehicle performance testing equipment. Background technique [0002] The background technology reference documents of the existing heavy-duty vehicle chassis dynamometer: HJ / T292-2006 "Technical Requirements for Exhaust Smoke Measuring Equipment of Diesel Vehicle Loading and Deceleration Conditions" and JT / T445-2008 "Automobile Chassis Dynamometer". There are following deficiencies: [0003] 1. According to HJ / T292-2006, all the rollers of the same chassis dynamometer have the same diameter. The heavy-duty vehicle emission detection adopts the structure of 3 rollers and 6 rollers. The coupling of the 6 rollers of the chassis dynamometer can be mechanical or e...

AI Technical Summary

Problems solved by technology

Due to the large center distance between the middle drum shaft and the rear drum shaft, the linear speed is high and the transmission noise is large

In order to adapt to the detection of vehicles with different wheelbases of double drive axles, the diameter of the rear roller is designed to be larger, resulting in the diameter of the front and middle rollers is also larger, thereby increasing the rated loading torque requirements of the power absorbing device, the front, middle and rear rollers The speed ratio is 1:1 connection, so that the equivalent inertia of the bench system for single drive axle heavy-duty vehicle detection is very large, the transition time to reach the steady-state vehicle speed point is lengthened, the over-load is increased, and the inertial power is increased, which reduces the accuracy of detection. performance, operability and safety

[0004] 2. According to JT / T445-2008, both the front roller and the rear roller are stipulated as the main roller, which are coaxially connected with the power absorbing device, that is, at least one power absorbing device is installed on the front and rear roller shafts coaxially, and two The power absorbing device increases the manufacturing cost, increases the equivalent inertia of the bench roller system, and increases the complexity of control