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Parking performance test device for passenger car on rotating hub test stand and application thereof

A test device and test bench technology, applied in the direction of measurement device, vehicle test, machine/structural component test, etc., can solve the problem that the structure design and optimization of the parking brake system cannot provide data support, and the parking brake force cannot be tested. , the data is not analyzable, etc.

Active Publication Date: 2016-05-25
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Both of the above test methods have certain limitations:
[0007] (1) Vehicles whose parking slope is between the two standard slopes cannot be tested by the above two test methods
[0008] (2) Neither of the above two test methods can test the parking slope corresponding to each ratchet of the ratchet parking brake system.
[0009] (3) When using the road test method to test the parking brake performance, it is inevitably restricted by many factors (such as: the inconsistency of the distribution of the axle load before and after the two loads, the influence of temperature, the brake manufacturing process, etc.), making the test data Poor reproducibility, making data unanalyzable
[0010] (4) Both of the above two test methods cannot test the parking brake force, and cannot clarify the relationship between the driver's operating force and the parking brake force, so that they cannot provide data support for the structural design and optimization of the parking brake system

Method used

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  • Parking performance test device for passenger car on rotating hub test stand and application thereof
  • Parking performance test device for passenger car on rotating hub test stand and application thereof
  • Parking performance test device for passenger car on rotating hub test stand and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1: A test device for parking performance of a passenger car on a hub test bench, comprising: a hub test bench 1, a force sensor 2 and an angular displacement sensor 4;

[0066] Such as figure 1 As shown, the passenger car is fixed on the hub test bench 1, and fixed according to the usage specification of the hub test bench, the accuracy of the test force of the hub test bench is 0.25%, and the accuracy of the test speed is 0.1km / h. Such as figure 2 and image 3 As shown, the hand-held end of the parking brake lever 3 of the passenger car is fixed with a force sensor 2 through a bracket. The force sensor is a sensor from the German HKM company. The power supply voltage is 10.5-25VDC, and the output signal is 0-5V analog. The test range is 0-500N, and the test accuracy is less than 0.5% FS. In order to accurately and truly measure the driver's operating force, it is necessary to ensure that the longitudinal symmetry plane B of the force sensor 2 coincides w...

Embodiment 2

[0068] Embodiment 2: as Figure 9 As shown, a method for testing the parking performance of a passenger car on a hub test bench is carried out in the following steps:

[0069] 2.1. An angular displacement sensor 4 is fixedly installed on the side of the parking brake lever 3 of the passenger car; Figure 8 As shown, the angular displacement sensor 4 is used to calibrate the angle of the pawl 5 matched with the bottom of the parking brake lever 3 on a flat road surface, and the angle of the kth tooth in the pawl 5 is obtained, which is denoted as 0≤k≤α; α represents the total number of teeth of the ratchet 5;

[0070] 2.2. A force sensor 2 is fixed on the hand-held end of the parking brake lever 3 through a bracket to obtain the driver's operating force;

[0071] 2.3. A passenger car is fixedly installed on the hub test bench 1, and the mode of the hub test bench 1 is set to road mode, and the sliding resistance of the hub test bench 1 is set to match that of the passenger c...

Embodiment 3

[0089]Embodiment 3, a method for evaluating the parking performance of a passenger car on a hub test bench is carried out as follows:

[0090] Step 1. Define variable k, 1≤k≤α;

[0091] Step 2, evaluating the parking performance of the kth tooth;

[0092] Step 3. Calculate the mean wheel edge force at the 0th tooth

[0093] Step 4. Based on the kth gear edge force set Extract the set of minimum wheel edge forces for each rotation of the wheel and the set of maximum wheel edge force

[0094] Step 5. Calculate the mean value of the minimum wheel edge force and the mean maximum wheel edge force

[0095] Step 6. Using formula (2) and formula (3) to calculate the equivalent standing slope range [θ k-min ,θ k-max ];

[0096] θ k - m i n = t a n ( a r c ...

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Abstract

The invention discloses a parking performance test device for a passenger car on a rotating hub test stand and an application thereof. The test device comprises a rotating hub test stand, a force sensor and an angle displacement sensor, wherein the rotating hub test stand is fixedly provided with the passenger car, a hand-operated end of a parking braking operation rod of the passenger car is fixedly provided with the force sensor, the side portion of the parking braking operation rod is fixedly provided with the angle displacement sensor, wheel side force during parking is acquired through the rotating hub test stand, operation force of a driver is acquired through the force sensor, an angle displacement of the parking braking operation rod is acquired through the angle displacement sensor, and thereby the passenger car parking performance test function is realized, and the parking performance is tested and evaluated through employing test methods such as wheel side force measurement and equivalent gradient calculation and on the basis of the probability theory evaluation method. The test device is advantaged in that the principle is simple, strong operability and high precision are realized, and the test device is applicable to mechanical and electronic parking braking systems.

Description

technical field [0001] The invention relates to the technical field of automobile testing, in particular to a device for testing the parking performance of a passenger car on a hub test bench and an application thereof. Background technique [0002] The parking brake system is a set of devices that make the stopped car stay in place. It is a device that the car must be equipped with. It is divided into two types: mechanical and electronic according to the structure of its transmission. The parking brake system of a passenger car must meet the requirements of relevant standards: produce a parking brake force that meets the requirements under the condition that the driver's operating force does not exceed 400N. [0003] Existing methods mainly include road test method and bench test method for parking brake performance test. [0004] Road test method: In the no-load state, the parking brake system should be able to ensure that the motor vehicle is on a slope of 20% (15% for m...

Claims

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Application Information

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IPC IPC(8): G01M17/007
CPCG01M17/007
Inventor 张小龙丁文俊刘鹏飞井梅邵彦胡博文曾云峰
Owner ANHUI AGRICULTURAL UNIVERSITY
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