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Hill start assistance method for motor vehicles

A technology for vehicles and slopes, applied in the field of slope start assist devices, which can solve the problems of height sensitivity, long response time, and difficulty in brake release

Active Publication Date: 2010-03-24
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the measurement of the bank angle is highly sensitive to noise e.g. due to movement of occupants in the vehicle
In addition, the bank angle sensor has a long response time, which makes it difficult to achieve an optimal brake release during drive-away

Method used

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  • Hill start assistance method for motor vehicles
  • Hill start assistance method for motor vehicles
  • Hill start assistance method for motor vehicles

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0042] A vehicle equipped with a hill-start aid implementing the method according to the invention comprises an engine block, an automatic parking brake 5, a bus 4 carrying signals from the rest of the vehicle 6, and an engine block control computer. Bus 4 is preferably CAN TM (Control Local Area Network) standard bus. The engine block consists of an internal combustion engine connected to a plurality of drive wheels through a transmission device including a gearbox and a clutch controlled by the user via a clutch pedal. In other embodiments, the engine pack may include one or more electric motors with or without an internal combustion engine.

[0043] This hill-start assist cooperates with a computer 1 which controls an automatic parking brake 5 and which is also connected to a bus 4 . As known, the computer 1 is equipped with means for generating instructions for applying and releasing the automatic parking brake 5 , said instructions for the brake 5 being generated on the...

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PUM

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Abstract

The invention relates to a hill start assistance method for the user of a vehicle having a braking system and an electronic braking control, provided with at least one master cylinder pressure sensor,whereby the pressure on each caliper of the vehicle can be controlled. The inventive method comprises the following steps in which: (a) the torque transmitted by the clutch is estimated, (b) information corresponding to the value of the master cylinder pressure resulting from a user's actuation of the brake pedal is recorded, and (c) the information recorded corresponding to the value of the master cylinder pressure is updated when the user actuates the brake pedal again by pressing harder on the pedal or partially releasing same. The invention is characterised in that, when the user releasesthe brake pedal fully, the braking system maintains the pressure on the calipers for a pre-determined period of time, as a function of a pressure set value equal to the value of the last item of information recorded.

Description

technical field [0001] The invention relates to a hill start assist device for a vehicle. [0002] More precisely, it concerns a hill-start assist device for motor vehicles with a manual gearbox (based on a hydraulic brake circuit). Background technique [0003] In today's vehicles, starting on a hill (or driving off on a hill) creates tension for the vehicle user trying to limit their vehicle's rollback as best they can. [0004] Usually, he has to transfer his foot from the brake pedal to the accelerator pedal as quickly as possible so that the vehicle does not have time to slide down the slope. [0005] Various solutions to avoid this source of tension are known. [0006] Document DE 102 42 122 proposes a method in which the brake release is effected as a function of the torque transmitted to the clutch. To this end, the method first determines the longitudinal forces acting on the wheels and the inertial forces acting on the vehicle when the vehicle is stationary, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W30/18B60T7/12
CPCB60W2510/1005B60W2540/12B60T7/122B60W2710/182B60T2201/06B60W2510/0208B60W2510/0657B60T7/12B60W30/18
Inventor M·马莱特R·波廷
Owner RENAULT SA