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

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

Active Publication Date: 2012-08-01
BYD CO LTD
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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

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

[0034] figure 1 For the method flowchart of an embodiment provided for the road surface recognition method of the present invention, refer to figure 1 , a road surface recognition method, comprising the following steps:

[0035] Step 11: During the braking time period T of the vehicle equipped with the ABS system, the vehicle wheel speed is collected in real time. In order to obtain a more accurate vehicle wheel speed, as an optimal solution, the vehicle wheel speed can be filtered;

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

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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 recognition method and system, and a vehicle anti-lock braking method and system. Background technique [0002] As we all know, road surface recognition methods play a very important role in the braking of vehicles (such as anti-lock braking system). The current anti-lock braking system (ABS for short) generally adopts the braking method of logic threshold value method + road surface recognition method, in which the road surface recognition method is mainly to identify the current road surface; the logic threshold value method is mainly based on road surface recognition Braking is controlled by the current road surface, thereby improving the braking effect of the vehicle. Although the above-mentioned ABS system braking method realizes the effect of braking, it has the following deficiencies: [0003] (1) In the traditional road surface identificat...

Claims

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Application Information

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Patent Type & Authority Applications(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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