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US5732378A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for determining a wheel brake pressure

Assignee: ITT Automotive Europe GmbH

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Filing: 1995-06-07

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Granted: 1998-03-24

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Expires: 2015-06-07

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Abstract

Abstract A method for controlling the brakes in an automotive vehicle. The vehicle has a velocity and a plurality of wheels, each wheel having an angular velocity and a brake which is operable by applying a pressure agent to the brake. An amount of the pressure agent to be applied to, or released from, each brake, individually, to implement a desired braking operation is determined. Switching times corresponding to the amounts of the pressure agent are calculated for opening and closing the inlet valve or outlet valve of each respective brake, individually. An estimated vehicle velocity and an estimated wheel angular velocity which result from applying the pressure agent to the brakes are determined. The actual velocity of the vehicle and the actual angular velocity of the wheels are determined by measuring the angular velocity, and determining the velocity based on the measurement. A comparison is performed, either between (1) the actual velocity and the estimated vehicle velocity, or (2) the actual angular velocity and the estimated wheel angular velocity. The amounts of the pressure agent to be applied to, or released from, each respective brake are adjusted, based on the comparison.

Inventors

👤 Alfred Eckert
👤 C. Jan S. Nederkoorn

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-11-04 06:44

CPC Classifications

B; B60; B60W; B60W10/00; B60W10/18; B60W10/184; B60T; B60T8/00; B60T8/17; B60T8/1755; B60W30/00; B60W30/02; B60W40/00; B60W40/02; B60W40/06; B60W40/064; B60G; B60G2400/00; B60G2400/10; B60G2400/104; B60G2400/1042; B60T2210/00; B60T2210/10; B60T2210/12; B60T2230/00; B60T2230/02; B60T2270/00; B60T2270/30; B60T2270/313; B60W2422/00; B60W2422/95; B60W2520/00; B60W2520/12; B60W2520/125; B60W2520/14; B60W2520/20; B60W2720/00; B60W2720/14; B60W2720/30

Claims Analysis

Total Claims: 15

Claim 1

Independent Claim 191 words

In an automotive vehicle having a velocity and a plurality of wheels, each wheel having an angular velocity and a brake which is operable by applying a pressure agent to the brake, a method for controlling the brakes, comprising the steps of: (a) determining amounts of the pressure agent to be applied to, or released from, each respective brake, individually, to implement a desired braking operation; (b) calculating an estimated vehicle velocity and an estimated wheel angular velocity which result from applying the respective amounts of the pressure agent to the brakes; and (c) determining the velocity of the vehicle and the angular velocity of the wheels by measuring at least one of the velocity and the angular velocity, and determining the other one of the velocity and the angular velocity based on the measurement; (d) performing a comparison between: (1) the velocity determined in step (c) and the estimated vehicle velocity, or (2) the angular velocity determined in step (c) and the estimated wheel angular velocity, respectively; and (e) adjusting the amounts of the pressure agent to be applied to, or released from, each respective brake, based on the comparison.

Claim 2

Dependent Claim 191 words

Claim 3

Dependent Claim 41 words

A method according to claim 1, wherein each brake has an inlet valve and an outlet valve, and steps (a) and (e) include determining switching times for opening and closing the inlet valve or outlet valve of each respective brake, individually.

Claim 4

Dependent Claim 59 words

A method according to claim 2, wherein a pressure change occurs in one of the brakes when the pressure agent is applied to or released from the brake, further comprising the step of: calculating said pressure change as a quadratic function of a length of time that the inlet valve or outlet valve of the one brake is opened.

Claim 5

Dependent Claim 57 words

A method according to claim 1, further comprising calculating a braking torque applied by each one of the brakes to the respective wheel to which the one brake corresponds, based on the amounts of the pressure agent to be applied to, or released from, each respective brake and at least one brake-specific attribute of each respective brake.

Claim 6

Dependent Claim 34 words

A method according to claim 4, further comprising calculating a respective wheel slip value for each one of the wheels, individually, based on the braking torque applied to the brake of the one wheel.

Claim 7

Dependent Claim 25 words

A method according to claim 1, wherein step (b) includes calculating the estimated vehicle velocity based on a dynamic axle load distribution of the vehicle.

Claim 8

Dependent Claim 148 words

In a motor vehicle, which is provided with means for determining the angular velocity of the wheels of the vehicle, means for determining the velocity of the vehicle, and means for determining the volume of the pressure medium taken up or released by the wheel brakes, a method for determining correction variables used in controlling the wheel brakes of the vehicle, comprising the steps of: calculating the angular velocity of the wheels and the velocity of the vehicle in an evaluation unit, based on the amount of pressure agent taken up or released by the wheel brakes, and comparing the calculated angular velocity of the wheels and calculated velocity of the vehicle with corresponding values of the angular velocity of the wheels and velocity of the vehicle determined by the angular velocity determining means and vehicle velocity determining means, respectively, and determining correction variables based on the comparison.

Claim 9

Dependent Claim 148 words

Claim 10

Dependent Claim 39 words

Method in accordance with claim 7, further comprising: determining switching times of inlet and outlet valves of said wheel brakes, and determining the amount of pressure medium taken up or released from the switching times by a quadratic comparison.

Claim 11

Dependent Claim 42 words

Method in accordance with claim 8, further comprising: determining a braking torque from the pressure medium volume taken up or released by the wheel brakes, taking wheel brake-specific values into account, and calculating the slip of the wheels from the braking torque.

Claim 12

Dependent Claim 38 words

Method in accordance with claim 8, further comprising: determining correction variables based on the comparing, and using the correction variables to correct the pressure determined on the basis of the switching times of the inlet and outlet values.

Claim 13

Dependent Claim 27 words

Method in accordance with claim 7, further comprising using the dynamic axle load distribution for calculating the angular velocity of the wheels and velocity of the vehicle.

Claim 14

Dependent Claim 219 words

In a motor vehicle having a plurality of wheel brakes, each brake having inlet and outlet valves for transmitting a pressure agent to and from the brakes, respectively, said vehicle having means for determining the angular velocity of the wheels of the vehicle, means for determining the velocity of the vehicle, and means for determining the volume of the pressure medium taken up or released by the wheel brakes, a method for controlling the value opening and closing times in the wheel brakes of the vehicle, comprising the steps of: determining opening and closing times for the inlet and outlet valves to apply the pressure agent to, or release the pressure agent from, each respective brake, individually, to implement a desired braking operation; calculating the angular velocity of the wheels and the velocity of the vehicle in an evaluation unit, based on the opening and closing times for the inlet and outlet valves of the wheel brakes; comparing the calculated angular velocity of the wheels and calculated velocity of the vehicle with corresponding values of the angular velocity of the wheels and velocity of the vehicle determined by the angular velocity determining means and vehicle velocity determining means, respectively; determining correction variables based on the comparison; and adjusting the valve opening and closing times, based on the correction variables.

Claim 15

Dependent Claim 219 words

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USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-03-23	2001-09-22	2002-03-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-03-23	2005-09-22	2006-03-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-03-23	2009-09-22	2010-03-24	$7700.00	Window Closed / Lapsed

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