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Method for improving brake pedal feel in a vehicle

A brake pedal, pedal technology, applied in the direction of brakes, vehicle components, brake transmission devices, etc., can solve problems such as hard pedals

Inactive Publication Date: 2016-12-28
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, if there is not enough vacuum to assist the brake operation, a "hard pedal" condition can occur in which the driver of the vehicle has to apply more brake pedal force than expected to achieve the desired braking

Method used

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  • Method for improving brake pedal feel in a vehicle
  • Method for improving brake pedal feel in a vehicle
  • Method for improving brake pedal feel in a vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The present invention relates to methods for varying brake pedal feel to reduce engine system (such as figure 1 A method and system for the possibility of a "hard pedal" condition in an engine system). The engine controller can be configured to perform tasks such as figure 2 A control routine of an exemplary program of the present invention to adjust operation of one or more brake system components to increase hydraulic brake line pressure in anticipation of an impending hard pedal condition. The controller may be configured to base hydraulic brake line pressure relative to brake booster vacuum level (for example using image 3 characteristic curve) to infer the imminent change in pedal feel (i.e., the pedal force required to achieve the desired change in brake pedal position). Such as Figure 4 As shown in the example of , by making proper adjustments before a pedal stiff condition occurs, brake line pressure can be increased such that the ratio of pedal pressure a...

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Abstract

Methods and systems are provided to reduce a hard brake pedal feel. A brake control variable is adjusted in anticipation of a hard pedal condition to increase hydraulic brake line pressure and maintain a normal pedal feel. A pedal force is inferred from brake line pressure relative to brake booster vacuum.

Description

technical field [0001] The present invention relates to methods and systems for reducing hard pedal conditions that may occur during brake pedal operation. Background technique [0002] Vacuum may be used to operate brakes for vehicle speed control. Vacuum may be provided by the engine via the engine intake manifold. Optionally, a vacuum pump can be controlled to provide vacuum. As such, if there is not enough vacuum to assist the brake operation, a "hard pedal" condition can occur in which the driver of the vehicle has to apply more brake pedal force than desired to achieve desired braking. Various methods have been developed to alleviate this "hard pedal" condition. [0003] One such method is shown in US Patent 6,754,579 to Kamiya et al. Among them, the engine controller automatically starts the engine once it determines that the vacuum of the brake booster is insufficient. Specifically, Kamiya adjusts the automatic engine restart operation based on the amount of bra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T7/04B60T8/44B60T13/66
CPCB60T13/662B60T7/042B60T8/441B60T8/442
Inventor 罗斯·戴克斯特拉·普斯福摩西·亚历山大·弗里德曼拉尔夫·韦恩·坎宁安
Owner FORD GLOBAL TECH LLC