Apparatus and method for isolating an intact portion of a service braking circuit from a failed service brake wheel end

Patent metadata

Field	Value
Publication number	US-10065617-B2
Application number	US-201615166299-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	Oct 18, 2012
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

An apparatus and method for protecting an intact portion of a service brake system from a failed wheel end of a vehicle is provided. A failure in a wheel end is detected by determining an operation state of each of the wheel ends by monitoring parameters including the pressure in a parking brake air supply line. When it is determined that a failed wheel end is present in the service brake system, a service brake isolation valve is switched to a state in which the failed wheel end is isolated from the rest of the brake system. The service brake of the failed wheel end is disabled, while the service brakes of the other wheel ends are enabled for normal operation. The parking brake of the failed wheel end is enabled, while the parking brakes of the other wheel ends are disabled to prevent immobilization of the vehicle.

First claim

What is claimed is:

1. An apparatus for protecting an intact wheel end of a brake system from a failed wheel end, comprising:
A first spring brake actuator having a service brake portion and a parking brake portion and associated with a first wheel end;
A second spring brake actuator having a service brake portion and a parking brake portion and associated with a second wheel end;
a first and second differential protection valve communicating with a spring brake control valve and the respective first and second spring brake actuators for controlling a supply of fluid for releasing the parking portions of the first and second spring brake actuators;
a first pressure indicator device and a second pressure indicator device communicating with the respective first and second differential protection valves for determining an operation state of the first and second wheel ends; and
a first and second service brake isolation valve communicating with the respective first and second pressure indicator devices and the respective first and second spring brake actuators, wherein, based upon a failed operation state of the first wheel end, the first service brake isolation valve isolates the failed first wheel end and prevents the service brake portion of the first spring brake actuator from receiving fluid.

2. The apparatus of claim 1 , wherein the operation state is determined based upon a pressure in a fluid supply line to the first and second spring brake actuators.

3. The apparatus of claim 1 , wherein the fluid is a gas.

4. The apparatus of claim 1 , wherein, in response to a failed operation state of the first wheel end, the first differential protection valve closes delivery to the first spring brake actuator.

5. The apparatus of claim 1 , wherein the operation state of the first wheel end is determined based upon a pressure in a fluid supply line to the parking brake portion of the first spring brake actuator as received from the first pressure indicator device.

6. An apparatus for protecting an intact portion of a service brake system of a vehicle having at least two wheel ends from a failed wheel end, comprising:
a first spring brake actuator provided for a first wheel end for actuating a service brake and releasing a parking brake;
a spring brake control valve for controlling actuation of the first spring brake actuator and a second spring brake actuator for parking braking;
a first differential protection valve provided for the first wheel end for controlling a first supply of fluid to the first spring brake actuator for releasing the parking brake;
a relay valve for applying and releasing the service brake via the first spring brake actuator and the second spring brake actuator;
a first pressure indicator device communicating with the first differential protection valve for determining an operation state of the first wheel end; and
a first service brake isolation valve provided for the first wheel end for protecting the intact portion of the first wheel end individually, based upon the operation state received from the first pressure indicator device.

7. The apparatus of claim 6 , wherein the operation state of the first wheel end is determined based upon a pressure in a fluid supply line to the spring applied parking brake.

8. The apparatus of claim 6 , wherein the fluid is a gas.

9. The apparatus of claim 6 , wherein, when the operation state of the first wheel end of the at least two wheel ends is a fault state, the first service brake isolation valve closes delivery to the first wheel end, while the second service brake isolation valve provided for the second wheel end, keeps open the delivery to the second wheel end that is in the normal operation state.

10. The apparatus of claim 6 , wherein, when the operation state of the first wheel end of the at least two wheel ends is a fault state, a second differential protection valve protects the parking brake of the second wheel end of the at least two wheel ends that is in a normal operation state.

11. An apparatus for protecting an intact wheel end of a brake system from a failed wheel end, comprising
A first and second spring brake actuator associated with each of a first and second wheel end, the first and second spring brake actuators having a service brake portion and a parking brake portion;
a spring brake control valve for controlling actuation of the parking portion of the respective first and second spring brake actuator;
means for controlling a supply of fluid for releasing the parking portion of the first and second spring brake actuators;
means for determining a pressure of the supply of fluid; and
a first and second service brake isolation valve communicating with the means for determining the pressure of the supply of fluid and the respective first and second spring brake actuator for determining an operation state of the first and second wheel ends, wherein, based upon a failure of a first wheel end, the means for controlling a supply of fluid prevents the parking brake of the second wheel end that is in a normal operation state from automatically applying.

Assignees

• Bendix Commercial Vehicle Systems Llc

Inventors

• Eberling Charles E
• Hoffman Fred W
• Plantan Ronald S

Classifications

• B60T17/22

  Devices for monitoring or checking brake systems; Signal devices · CPC title

• B60T8/885 Primary

  using electrical circuitry · CPC title

• B60T2270/402

  Back-up · CPC title

• B60T17/221

  Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems (hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M) · CPC title

• B60T2270/10

  ABS control systems · CPC title