Condensate drainage system for pneumatic tanks

• US 5,749,391 A
• Filed: 02/14/1996
• Issued: 05/12/1998
• Est. Priority Date: 02/14/1996
• Status: Expired due to Fees

• Current Assignee: Freightliner Corporation
• Original Assignee: Freightliner Corporation
• Inventors: Loutzenhiser, Douglas J.
• Primary Examiner(s): KAMEN, NOAH P
• Application Number:
  US08/601,190
• Time in Patent Office: 818 Days
• Field of Search: 123/198 D, 137/203, 137/204, 251/129.1
• US Class Current: 137/204
• CPC Class Codes: F15B 21/041 Removal or measurement of solid or liquid contamination, e.g. filtering
• CPC Class Codes: F16T 1/00 Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers
• CPC Class Codes: Y10T 137/3105 Self-emptying

Abstract

A condensate drainage system for pneumatic tanks is disclosed. Large vehicles typically use compressed air for operating various vehicle functions such as its brakes. In conjunction with the use of compressed air there is provided a pneumatic system including a compressor and pneumatic storage tanks. Because of the properties of compressed air, it is necessary to drain condensates and contaminants from the pneumatic storage tanks in order to prevent the condensates and contaminants from migrating throughout the air system, and interfering with the operation of, the brakes. Accordingly, electrically controlled drain valves are connected to the pneumatic tanks for purging condensate and contaminants. A logic controller which receives inputs from sensors and determines an engine status controls the operation of the drain valves so as to optimally purge condensates and contaminants. The controller includes a CPU, programmable memory, and a timer. A push button control is also provided to override timing functions within the controller.

Claims

1. A condensate draining system for a pneumatic system of an engine powered vehicle, the vehicle having pneumatically operated components responsive to the pneumatic system, the system comprising:

(a) a drain valve connected to the pneumatic system, the drain valve having an open position for discharging condensate and a closed position for containing pressurized air within the pneumatic system; and

(b) a controller having a logic system, the controller being coupled to the drain valve and being operable to control the position of the valve between open and closed positions; and

(c) a sensor for sending an engine status signal indicative of a first operational engine status and a second operational engine status, the operational engine statuses relating to a status of the engine when the engine is running;

(d) wherein the controller receives the engine status signal and is operable to control the position of the drain valve according to a first schedule in response to the first operational engine status and a second schedule in response to the second operational engine status so as to prevent the accumulation of condensate in the pneumatic system.

2. The condensate draining system of claim 1 wherein the drain valve comprises:

(a) a body defining a chamber and having an inlet port and an outlet port;

(b) a port closer positioned within the chamber and movable between the closed position substantially blocking the outlet port and the open position not substantially blocking the outlet port; and

(c) an electrically activated transducer within the chamber that is controllably coupled to the port closer, the transducer moving the port closer from the open position to the closed position in response to a first electrical signal from the controller and from the closed position to the open position in response to a second electrical signal from the controller.

3. The condensate draining system of claim 1 wherein the drain valve comprises:

(a) a body defining a chamber and having an inlet port and an outlet port;

(b) a port closer having a ferromagnetic portion and positioned within the chamber and movable between the closed position substantially blocking the outlet port and the open position not substantially blocking the outlet port; and

(c) electrically activated solenoids located within the chamber and wherein the solenoids each define a central opening and the ferromagnetic portion is positioned within the central openings of the solenoids such that activation of the solenoids in response to electrical signals moves the port closer between the open and closed positions;

(d) a fluid heater located within the chamber;

(e) a position sensor located within the chamber that provides an electrical signal indicative of the position of the port closer; and

(f) a mechanical retainer coupled to the port closer and operable to maintain the port closer in the open and closed positions, respectively, until respective electrical signals activate the solenoids.

4. The condensate draining system of claim 1 wherein the engine status signal can further determine when the engine is off and the controller causes the drain valve to open at least two minutes after the engine status signal indicates that the engine is off.

5. A condensate draining system for a pneumatic system of an engine powered vehicle, the vehicle having pneumatically operated components responsive to the pneumatic system, the system comprising:

(a) a drain valve connected to the pneumatic system, the drain valve having an open position for discharging condensate and a closed position for containing pressurized air within the pneumatic system; and

(b) a controller having a logic system, the controller being coupled to the drain valve and being operable to control the position of the valve between open and closed positions;

(c) a sensor for sending an engine status signal indicative of an engine status, and wherein the controller receives the engine status signal and is operable to control the position of the drain valve in response to the engine status signal so as to prevent the accumulation of condensate in the pneumatic system;

(d) wherein the engine status signal is indicative of the number of revolutions per minute of the engine.

6. A condensate draining system for a pneumatic system of an engine powered vehicle, the vehicle having pneumatically operated components responsive to the pneumatic system, the system comprising:

(a) a drain valve connected to the pneumatic system, the drain valve having an open position for discharging condensate and a closed position for containing pressurized air within the pneumatic system; and

(b) a controller having a logic system, the controller being coupled to the drain valve and being operable to control the position of the valve between open and closed positions;

(c) a sensor for sending an engine status signal indicative of an engine status, and wherein the controller receives the engine status signal and is operable to control the position of the drain valve in response to the engine status signal so as to prevent the accumulation of condensate in the pneumatic system;

(d) wherein the engine status signal indicates that the vehicle is moving and the controller controls the drain valve to open after a first time interval and close after a second time interval, the second time interval being of a sufficiently short duration to maintain sufficient air pressure within the pneumatic system to operate the pneumatically operated components of the vehicle.

7. The condensate draining system of claim 6 wherein the controller controls the drain valve to close and thereafter controls the drain valve to open after the first time interval, the first time interval having a first length of at least thirty minutes and to close after the second time interval, the second time interval having a second length which is shorter than the first length.

8. The condensate draining system of claim 6 wherein when the engine status signal indicates the engine is off the controller controls the drain valve to open after a third time interval.

9. The condensate draining system of claim 8 wherein the controller further includes a manual control which is manually actuatable to cause the controller to control the position of the drain valve at least to the open position, and when the engine status signal indicates that the vehicle is idling the controller controls the drain valve to close and upon actuation of the manual control the controller controls the drain valve to open and thereafter controls the drain valve to close after a time interval.

10. A condensate draining system for a pneumatic system of an engine powered vehicle, the vehicle having pneumatically operated components responsive to the pneumatic system, the system comprising:

(a) a drain valve connected to the pneumatic system, the drain valve having an open position for discharging condensate and a closed position for containing pressurized air within the pneumatic system; and

(b) a controller having a logic system, the controller being coupled to the drain valve and being operable to control the position of the valve between open and closed positions; and

(c) a sensor for sending an engine status signal indicative of an engine status, and wherein the controller receives the engine status signal and is operable to control the position of the drain valve in response to the engine status signal so as to prevent the accumulation of condensate in the pneumatic system;

(d) wherein the controller further includes a manual control which is manually actuatable to cause the controller to control the position of the drain valve at least to the open position, and when the engine status signal indicates that the vehicle is idling the controller controls the drain valve to close and upon actuation of the manual control the controller controls the drain valve to open and thereafter controls the drain valve to close after a time interval.

11. The condensate draining system of claim 10 wherein the time interval being of a sufficiently short duration to maintain sufficient air pressure within the pneumatic system to operate the pnuematically operated components of the vehicle.

12. A condensate draining system for a pneumatic system of an engine powered vehicle, the vehicle having pneumatically operated components responsive to the pneumatic system, the system comprising:

(a) a drain valve connected to the pneumatic system, the drain valve having an open position for discharging condensate and a closed position for containing pressurized air within the pneumatic system; and

(b) a controller having a logic system, the controller being coupled to the drain valve and being operable to control the position of the valve between open and closed positions; and

(c) a sensor for sending an engine status signal indicative of an engine status, and wherein the controller receives the engine status signal and is operable to control the position of the drain valve in response to the engine status signal so as to prevent the accumulation of condensate in the pneumatic system;

(d) wherein the controller further includes an operable manual control and the pneumatic system includes at least two pneumatic tanks each with a respective drain valve connected thereto and when the engine status signal indicates that the engine is off and the manual control is operated the controller controls a first at least one of the drain valves to open and thereafter controls a second at least one drain valve to open after a time interval.

13. The condensate draining system of claim 12 wherein the controller controls the first at least one drain valve to open after a first time interval and thereafter controls the second at least one drain valve to open after a second time interval.

14. The condensate draining system of claim 12 wherein the controller controls the first at least one drain valve to open after a time interval of at least 30 minutes and thereafter controls the second at least one drain valve to open after a time interval of at least 120 minutes.

15. A vehicle having a pneumatic system with a condensate draining system comprising a drain valve connected to the pneumatic system, the drain valve having an open position for discharging condensate and a closed position for containing pressurized air within the pneumatic system, a controller having a logic system, the controller being coupled to the drain valve and being operable to control the position of the valve between open and closed positions, a sensor for sending an engine status signal indicative of an engine status, the controller receiving the engine status signal, the controller being operable to control the position of the drain valve in response to the engine status signal so as to prevent the accumulation of condensate in the pneumatic system, and a cab having an interior cab including a manual control which is manually actuatable to cause the controller to control the position of the drain valve at least to the open position.

16. A pneumatic system for an engine powered vehicle, comprising:

(a) an air tank having an interior cavity for containing pressurized air;

(b) a drain valve in communication with the interior cavity of the air tank and configurable to an open state for discharging condensate from the air tank and a closed state for containing pressurized air in the air tank;

(c) a sensor for sending an engine status signal; and

(d) a controller in communication with the drain valve wherein the controller is responsive to the engine status signal and determines an engine status and the controller sends at least one signal to the drain valve to configure the drain valve into the open and closed states according to a predetermined schedule for the determined engine status, the drain valve responsive to the controller signal so that the drain valve moves into the open and closed position without pneumatic pressure to move the drain valve.

17. The pneumatic system of claim 16 wherein the drain valve comprises:

(a) a body defining a chamber and having an inlet port and an outlet port;

(b) a port closer positioned within the chamber and movable between a closed position substantially blocking the outlet port and an open position not substantially blocking the outlet port; and

(c) an electrically activated transducer within the chamber and controllably coupled to the port closer, the transducer moving the port closer to the open and closed positions in response to the at least one signal from the controller.

18. A pneumatic system for an engine powered vehicle, comprising:

(a) an air tank having an interior cavity for containing pressurized air;

(b) a drain valve in communication with the interior cavity of the air tank and configurable to an open state for discharging condensate from the air tank and a closed state for containing pressurized air in the air tank;

(c) a sensor for sending an engine status signal;

(d) a controller in communication with the drain valve wherein the controller is responsive to the engine status signal and determines an engine status and the controller sends at least one signal to configure the drain valve into the open and closed states according to a predetermined schedule for the determined engine status; and

(e) a cab having an interior portion including a manual control mounted therein which is manually actuatable to cause the controller to send a signal to configure the drain valve into at least the open state.

19. A pneumatic system for an engine powered vehicle, comprising:

(a) an air tank having an interior cavity for containing pressurized air;

(b) a drain valve in communication with the interior cavity of the air tank and configurable to an open state for discharging condensate from the air tank and a closed state for containing pressurized air in the air tank;

(c) a sensor for sending an engine status signal; and

(d) a controller in communication with the drain valve wherein the controller is responsive to the engine status signal and determines an engine status and the controller sends at least one signal to configure the drain valve into the open and closed states according to a predetermined schedule for the determined engine status, and wherein the engine status signal is indicative of the number of engine revolutions per minute.

20. A pneumatic system for an engine powered vehicle, comprising:

(a) an air tank having an interior cavity for containing pressurized air;

(b) a drain valve in communication with the interior cavity of the air tank and configurable to an open state for discharging condensate from the air tank and a closed state for containing pressurized air in the air tank;

(c) a sensor for sending an engine status signal; and

(d) a controller in communication with the drain valve wherein the controller is responsive to the engine status signal and determines an engine status and the controller sends at least one signal to configure the drain valve into the open and closed states according to a predetermined schedule for the determined engine status, and wherein the controller determines a first engine status and in response sends a first signal to configure the drain valve into the closed state and thereafter sends a second signal to configure the drain valve into the open state after a first time interval and thereafter sends a third signal to configure the drain valve into the closed state after a second time interval thereby purging condensate from the pneumatic system.

21. The pneumatic system of claim 20 wherein the controller further includes an operable manual override and the controller determines a second engine status and in response the controller sends a first signal to configure the drain valve into the closed state and in response to operation of the manual override the controller sends a second signal to configure the drain valve into the open state and thereafter sends a third signal to configure the drain valve into the closed state after a wait interval.

22. The pneumatic system of claim 21 wherein the controller determines a third engine status and in response sends a signal to configure the drain valve into the open state after a wait interval.

23. A pneumatic system for an engine powered vehicle, comprising:

(a) an air tank having an interior cavity for containing pressurized air;

(b) a drain valve in communication with the interior cavity of the air tank and configurable to an open state for discharging condensate from the air tank and a closed state for containing pressurized air in the air tank;

(c) a sensor for sending an engine status signal; and

(d) a controller in communication with the drain valve wherein the controller is responsive to the engine status signal and determines an engine status and the controller sends at least one signal to configure the drain valve into the open and closed states according to a predetermined schedule for the determined engine status, wherein the pneumatic system further includes at least two air tanks and a respective number of drain valves attached to the tanks and the controller determines a third engine status and in response the controller sends a first signal to configure a first at least one drain valve into the open state after a first time interval and sends a second signal to configure a second at least one drain valve into the open state after a second time interval.

24. The pneumatic system of claim 23 wherein the controller further includes an operable manual override and wherein in response to operation of a manual override the controller sends a signal to configure a first at least one drain valve into the open state and thereafter sends a second signal to configure a second at least one drain valve into the open state after a time interval.