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Pavement identification method and system as well as vehicle anti-lock brake method and system

A road surface recognition and vehicle braking technology, applied in the field of road surface recognition, can solve the problems of single parameters and low accuracy, and achieve the effect of extending the braking distance

Active Publication Date: 2015-06-24
BYD CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention provides a high-accuracy road surface recognition method and system to solve the technical problem of low accuracy caused by the single parameter used in the traditional road surface recognition method

Method used

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  • Pavement identification method and system as well as vehicle anti-lock brake method and system
  • Pavement identification method and system as well as vehicle anti-lock brake method and system

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Embodiment Construction

[0033] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0034] figure 1 This is a flowchart of an embodiment method provided by the road surface recognition method of the present invention, see figure 1 , The road surface recognition method includes the following steps:

[0035] Step 11: Collect the vehicle wheel speed in real time during the braking period T of the vehicle equipped with the ABS system. In order to collect the vehicle wheel speed more accurately, as a preferred solution, the vehicle wheel speed can be filtered;

[0036] Step 12: Calculate slip rate λ, slip rate change rate dλ / dt, deceleration a, and deceleration...

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Abstract

The invention relates to a pavement identification method. The pavement identification method comprises the following steps: firstly collecting the speed of a vehicle wheel in real time during braking time quantum T of a vehicle provided with an ABS (Anti-lock Brake System); calculating a slip rate lambda, a change rate d lambda / dt of the slip rate, a deceleration a and a change rate da / dt of the deceleration, and calculating a pavement factor omega according to the speed of the vehicle wheel, and carrying out an average calculation on the obtained omega at each time coefficient delta T to obtain omega 0; and finally respectively carrying out one subtraction operation on the omega 0 and pre-stored all pavement nominal factors to take pavement corresponding to the minimum pavement nominal factor of an absolute value of the omega 0 difference value as pavement on which a vehicle is located at current time. According to the pavement identification method disclosed by the invention, defect that the existing pavement identification method is lower in identification accuracy by utilizing a single parameter are prevented, not only can the identification precision be improved, but also the braking time of the vehicle is fully utilized.

Description

Technical field [0001] The invention relates to the field of vehicle anti-lock braking methods, in particular to a road surface identification method and system, and a vehicle anti-lock braking method and system. Background technique [0002] As we all know, road recognition methods play a very important role in vehicle braking (such as anti-lock braking systems). The current anti-lock braking system (abbreviated as ABS) commonly used braking method is logical threshold method + road recognition method, the road recognition method is mainly to identify the current road; the logical threshold method is mainly based on road recognition The current road surface controls braking to improve the braking effect of the vehicle. Although the aforementioned ABS system braking method realizes the braking effect, it has the following shortcomings: [0003] (1) In the traditional road recognition method, only slip rate is used as the road recognition parameter. Since the brake is slowly appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T8/176
Inventor 杨青吴硕孙永锋宋豪杰徐波
Owner BYD CO LTD
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