[특허]Method and apparatus for maximizing vehicle braking effectiveness and control

Method and apparatus for maximizing vehicle braking effectiveness and control 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B60T-013/00
출원번호	US-0114653 (1993-08-31)
발명자 / 주소	Breen Michael T. (Garden City MI)
출원인 / 주소	Eaton Corporation (Cleveland OH 02)
인용정보	피인용 횟수 : 25 인용 특허 : 0

초록 ▼

Optimum braking effectiveness and control of a vehicle are obtained by continually evaluating estimated values of friction coefficients as they increase with decreasing vehicle velocity during vehicle braking and by increasing brake pressure accordingly to maintain the pressure just under a value at which vehicle control is compromised. This is enhanced by determining a maximum pressure that can be applied to each brake sight while maintaining the rate of change of the articulation angle between a tractor and trailer of the vehicle equal to zero. A further enhancement is obtained by estimating critical vehicle velocity as a function of steering angle, thus enabling braking effectiveness and control to be a function of maneuvering conditions.

대표청구항 ▼

A method for determining and applying optimum effective braking force to brakes of a vehicle negotiating a curve, when lateral and longitudinal forces are acting on the vehicle, the vehicle having a plurality of wheels, at least two of the wheels being steer wheels, the method comprising the steps of: sensing the angular disposition of at least one of the steer wheels; generating a turning radius signal representative of a turning radius associated with the angular disposition of the at least one of the steer wheels; sensing the angular velocity of a wheel; generating a wheel speed signal representative of the angular velocity of the wheel; sensing actual brake pressure; generating an actual brake pressure signal representative of the actual brake pressure; determining, as a function of wheel deceleration and the actual brake pressure signal, an estimated value mPEAK for road-tire coefficient of friction; generating a mPEAK signal representative of the value of road-tire coefficient of friction; determining, in response to the turning radius signal and the mPEAK signal, an estimated value for a brake pressure that will apply the brakes to provide optimum braking effectiveness while maintaining vehicle control under prevailing conditions by determining, prior to vehicle deceleration, an initial value of critical vehicle velocity Vc above which control of the vehicle cannot be maintained in the curve, the critical vehicle velocity being determined according to the following, initial equation therefor: [Figure] where: R=the radius of the curve, mmb associated with brake force according to the following equation: [Figure] determining, after a time interval t from the beginning of vehicle deceleration, a subsequent value of critical vehicle velocity by multiplying the value of the previously determined longitudinal coefficient of friction component mb by the value of gravity g and by a time interval t and subtracting the product from the previously determined value of critical vehicle velocity; adjusting the brake pressure to provide a vehicle velocity just below that of the subsequent value of critical vehicle velocity just determined; determining a subsequent value of the longitudinal coefficient of friction component associated with brake force according to the equation therefor; determining, at the end of another time interval t, a subsequent value of critical vehicle velocity by multiplying the previously determined value of the longitudinal coefficient of friction component mb by the value of gravity g and by a time interval t and subtracting the product from the previously determined value of critical vehicle velocity; adjusting the brake pressure to provide a vehicle velocity just below that of the subsequent value of critical vehicle velocity just determined; and repeating the immediately preceding three steps until the brake pressure is released or until the vehicle has stopped, thereby providing optimum braking effectiveness while maintaining vehicle control under prevailing conditions by increasing brake pressure as decreasing vehicle velocity results in an increasing coefficient of friction.

이 특허를 인용한 특허 (25)

Kitazaki,Tsuyoshi; Matsuda,Jun; Miyashita,Naoshi, Apparatus and method for predicting a breaking distance of a vehicle.
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Gabriel Wetzel DE; Ian Faye DE; Klaus-Dieter Leimbach DE; Uwe Kuhnle DE, Apparatus and method for stabilizing a vehicle combination made up of a tractor vehicle and a trailer or semitrailer.
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Wataru Tanaka JP; Toshiaki Hamada JP; Hirofumi Nitta JP, Brake control device for a vehicle.
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Kato Toshihisa,JPX ; Abe Yasuhiro,JPX, Coefficient of friction peak estimation apparatus.
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Czlapinski, Craig Robert; Sagalovich, Ilya, Determining turning radius of coupled vehicles.
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Iwasaka, Takeshi, Lane departure prevention system with towing vehicle using yaw moment correction.
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Offerle, Timothy G.; Tseng, Hongtei E.; Rhode, Douglas S.; Brown, Gregory P., Method and apparatus for controlling brake-steer in an automotive vehicle in reverse.
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Offerle,Timothy G.; Tseng,Hongtei E.; Stephan,Craig H., Method and apparatus of controlling an automotive vehicle using brake-steer as a function of steering wheel torque.
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Horn Matthias,DEX ; Veil Hans,DEX, Method and device for controlling the braking system of a vehicle.
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Ahner,Peter; Schadow,Joachim; Zegelaar,Peter, Method and device for detecting and stabilizing a fishtailing trailer using wheel forces.
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Traechtler, Ansgar, Method and device for identifying a rolling motion in a vehicle.
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Lenz,Thomas; Meyer,Benno; Ruhnau,Gerhard, Method for controlling the brake system of a vehicle train.
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Gerum Eduard,DEX ; Laszlo Palkovics,HUX ; Semsey Akos,HUX ; Barta Gabor,HUX, Method for drive stability enhancement of multi-unit vehicles.
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Hahne, Uwe, Method for operating a driver assistance system and driver assistance system.
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Lu,Jianbo; Offerle,Timothy G., Method of controlling an automotive vehicle having a trailer using rear axle slip angle.
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Robertson, Stephen L., Systems, vehicles and methods for controlling an application of a plurality of trailer brakes.
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Matoy, Eric A.; Tober, Michael D., Towing vehicle controller providing brake control to a towed vehicle and method.
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Matoy, Eric A; Tober, Michael D, Towing vehicle controller providing brake control to a towed vehicle and method.
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Juergens Eugene H. (Grafton WI) Novesky Timothy A. (Grafton WI) Rychtik Jerome (Grafton WI), Tractor trailer integrated jackknife control device.
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Oh, Pahngroc; Funke, Scott; Pavlov, Kevin J., Trailer control system.
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Itano, Yasuharu, Train braking device and train braking method.
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Greenwood, Jeremy John; Nicholls, Stephen; Crawford, Andrew Stephen Bell, Vehicle maneuvering aids.
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Greenwood, Jeremy John; Nicholls, Stephen; Crawford, Andrew Stephen Bell, Vehicle trailer angle detection system and method.
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Greenwood, Jeremy John; Nicholls, Stephen; Crawford, Andrew Stephen Bell, Vehicle trailer angle detection system and method.
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Method and apparatus for maximizing vehicle braking effectiveness and control 원문보기

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Method and apparatus for maximizing vehicle braking effectiveness and control 원문보기

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