Method for determining altitude difference between roller braking bed and ground

Abstract

A method for determining the altitude difference between a roller braking bed and the ground ensures that the wheel center heights of wheels tested on the roller braking bed of a multi-axis vehicle are not smaller than or slightly larger than those of wheels not tested on the flat ground to enable the adhesive weight of an axle to a roller not to be reduced so as to detect the deflection of a wheel with the minimum diameter of the multi-axis vehicle to determine the fixed ascending distance between a bus on an auxiliary roller of the roller braking bed and the ground level, then the deflection of a wheel with the maximum diameter is used to check and control that the ascending of the wheel center is not excessive, and the altitude difference between the roller braking bed and the ground is determined according to calculation of the minimum wheel diameter and the structural parameters of the roller braking bed. A conventional roller braking bed is simply, conveniently and quickly modified to adapt to accurate detection of the braking performance of various vehicles, such as two-axis vehicles and multi-axis vehicles.

Description

technical field [0001] The method of determining the height difference between the drum brake table and the ground is to determine the lift distance of the bus bar on the auxiliary drum relative to the ground plane through the sinking of the wheels when the car is on the drum brake table, so as to ensure the distance between the axles of the multi-axle vehicle and the drum. The adhesion weight does not decrease, and belongs to the technical field of automobile performance bench test detection methods. Background technique [0002] In the current automobile braking performance test, the axle is weighed on the ground wheel weight platform and then driven to the drum brake platform for braking testing. According to the national standard GB7258-2012 "Technical Conditions for Motor Vehicle Operation Safety" Table 6 test braking force requirements, the percentage of the front axle braking force and front axle load is required to be greater than or equal to 60%, and the definition:...

AI Technical Summary

Problems solved by technology

However, tests have shown that the second steering shaft of a dual-steering axle vehicle will be partially lifted by the first steering shaft and the third shaft during detection, greatly reducing the attachment weight, and it is difficult to meet the detection requirements of the 60% braking rate of the front axle

When the trailer is being towed by the tractor, the first axle of the trailer is also partly lifted off by the second axle and the rear axle of the tractor. It is not only difficult to meet the detection requirements of 50% axle braking rate, but also difficult to achieve 60% of the whole vehicle system. Mobility testing requirements

Even if the braking performance of the vehicle is good, the reduction of the attached weight will reduce the maximum braking force detected, and the reduction of the shaft braking rate compared with the weighing weight on the ground wheel weight platform will hardly meet the standard, resulting in wrong detection and wrong judgment

The prior art is: (1) increase the weight or add pressure to the vehicle or add tension to the measured axle to increase the adhesion weight of the wheel to the roller by the loading method, and the operability of this method is extremely poor

(2) Use the power mechanism to lift the roller brake table to detect multi-axle vehicles, the structure is complex, the price is high, and the operation is troublesome

(3) It is tested on a compound platform combining weighing and braking, and the reduced attachment weight and detection braking force can meet the axle braking rate detection of multi-axle vehicles, but due to the greatly reduced axle weight and The weight of the whole vehicle and the braking force virtually reduce the braking performance requirements of the vehicle, which is an irregular test

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