Method for operating hydraulic braking system of motor vehicle and hydraulic braking system

A motor vehicle, hydraulic braking technology, applied in the direction of brakes, etc., can solve the problems of braking system failure, energy complexity, disadvantages, etc., and achieve the effect of reducing braking distance, precise control, and reducing braking distance

Active Publication Date: 2013-03-20
FORD GLOBAL TECH LLC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] US 2010 / 0225159 A1 discloses a braking system for a motor vehicle in which a pressure supply is formed by a cylinder-piston arrangement, wherein the piston can be driven by an electromechanical drive powered by an electrical energy storage device, the purpose of which is to be able to temporarily store hydraulic pressure drive energy, which is energetically complex, unfavorable, and tends to contribute to braking system failure, should be eliminated

Method used

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  • Method for operating hydraulic braking system of motor vehicle and hydraulic braking system

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Embodiment Construction

[0022] The algorithm according to the invention is executed in a known manner by the engine controller (ECU) or a suitable engine control system (eg ESC unit) as part of a background loop executed periodically (eg every 20 milliseconds).

[0023] In step 10, the operating controller receives information from a higher level or equivalent level controller (not shown in the figure) as to whether the vehicle is in ABS mode, i.e. whether the braking of at least one wheel of the vehicle needs to be reduced. power. If the vehicle is not in ABS mode, the algorithm ends immediately (not shown in the figure).

[0024] If ABS mode is present, regardless of whether ABS intervenes or not, in step 20 the required maximum brake pressure P_W_ABS_MAX is calculated for all wheels of the vehicle.

[0025] Furthermore, in step 30 , the pressure level of the master cylinder required by the driver (or the brake assist system) is queried. This value is stored in the variable P_TMC_ref.

[0026] I...

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Abstract

The invention relates to a method for operating a hydraulic braking system of a motor vehicle and the hydraulic braking system. The method for operating the hydraulic braking system of the motor vehicle, wherein the hydraulic braking system having a brake master cylinder and an electronic control device having an anti-lock braking system (ABS) function, comprises: determining whether the brake pressure requested by a vehicle's driver exceeds a wheel lock brake pressure (10) at which at least one of the wheels of the vehicle locks up; and activating the brake master cylinder electromechanically if the requested brake pressure exceeds the wheel lock brake pressure, to reduce the brake pressure produced by the brake master cylinder to a value lower than the brake pressure requested by the driver.

Description

technical field [0001] The invention relates to a method for operating a hydraulic braking system of a motor vehicle and to a hydraulic braking system. [0002] Although the invention may be used particularly advantageously with SUVs and trucks, the invention is not limited thereto. Rather, the present invention can be used in general with hydraulic braking systems on any size vehicle. Background technique [0003] Vehicle manufacturers have made great efforts to reduce the braking distance of their motor vehicles (for example, from a speed of 100 km / h of the motor vehicle to a standstill), which is reflected especially in more realistic test reports in specialist journals come out. As such, vehicle tires are an important limiting factor in terms of braking distance. Additionally, means for reducing stopping distances could include careful and selective tuning of the anti-lock braking systems (ABS) that are offered as standard in series production of cars, trucks and SUVs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/176
CPCB60T8/17616B60T13/662B60T13/66B60T8/447B60T8/176
Inventor 伊恩·穆尔托马斯·斯文森鲁道夫·丹尼尔斯
Owner FORD GLOBAL TECH LLC
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