Ramp brake pressure determination method and system, and vehicle

A technology for determining the method and slope, which is applied to vehicle components, brake pressure measurement, brakes, etc., can solve problems such as unreasonable brake pressure, inaccurate calculation of wheel speed acceleration, and large fluctuations in vehicle body acceleration sensors, so as to improve reliability , Guaranteed the effect of braking distance and comfort

Pending Publication Date: 2021-06-04
NIO TECH ANHUI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem with this method is that the vehicle body acceleration sensor fluctuates greatly when the vehicle is moving and during the process of starting and stopping the vehicle, and the calculation of the wheel speed acceleration is inaccurate at low speeds, which will lead to unreasonable determination of the brake pressure

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  • Ramp brake pressure determination method and system, and vehicle
  • Ramp brake pressure determination method and system, and vehicle

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Embodiment Construction

[0058] Introduced below are some of the various embodiments of the invention, intended to provide a basic understanding of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of protection.

[0059] For purposes of brevity and illustration, the principles of the invention are described herein primarily with reference to exemplary embodiments thereof. However, those skilled in the art will readily recognize that the same principles are equally applicable to all types of on-ramp brake pressure determination methods and on-ramp brake pressure determination systems. And these same principles can be implemented therein, and any such changes do not depart from the true spirit and scope of this patent application.

[0060] Moreover, in the following description, reference is made to the accompanying drawings, which illustrate certain exemplary embodiments. Electrical, mechanical, logical and structural changes may be mad...

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Abstract

The invention relates to a ramp brake pressure determination method and system. The method comprises the steps of determining a ramp estimation value before braking according to a set period, determining the current ramp estimation value before braking and serves as a first ramp estimation value aestimate1, and using the ramp estimation value before braking of the previous period latched before braking pressure is established as a second ramp estimation value aestimate2; locking the instant vehicle speed vbrake before the brake pressure is established, accumulating the vehicle driving distance lbrake and the time tbrake, and determining a ramp estimation value aslop during braking based on the instant vehicle speed vbrake, the vehicle driving distance lbrake and the time tbrake; and according to the second ramp estimation value aestimate2 and the third ramp estimation value aestimate3, determining the pre-braking pressure p1 and the middle-braking pressure p2, determining the initial braking pressure p3 based on the pre-braking pressure p1 and the middle-braking pressure p2, and determining the final braking pressure p4 based on the initial braking pressure p3. According to the method, the brake pressure can be accurately determined.

Description

technical field [0001] The invention relates to vehicle control technology, in particular to a method and system for determining slope braking pressure when braking on a slope. Background technique [0002] In assisted driving vehicle control, vehicle motion control needs to cover a variety of road conditions, among which slopes are the most common road conditions. Among them, the inaccurate calculation of the braking pressure on the slope and the braking pressure of the parking hold will lead to excessive braking or insufficient braking force, resulting in walking on the slope. [0003] At present, the commonly used algorithm is to determine the slope by comparing the measured value of the vehicle body acceleration with the calculated value of the wheel speed acceleration, so as to calculate the braking pressure. However, the problem with this method is that the vehicle body acceleration sensor fluctuates greatly when the vehicle is moving and during the process of startin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/172B60T8/171
CPCB60T8/172B60T8/171B60T2201/06B60W40/076B60W2552/15B60T17/221B60T2210/20B60T2220/04B60T2240/00B60T2250/00B60T2250/04B60T2270/88
Inventor 张宪会肖柏宏邹杉原达
Owner NIO TECH ANHUI CO LTD
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