Air seeder monitoring and equalization system using acoustic sensors

1. A particulate flow monitor for a system including a particulate flow tube defining a particulate flow path and the flow tube terminating at a particulate discharge, which flow monitor comprises:

an acoustic transducer connected to the flow tube intermediate the blower and the discharge;

an impact surface on said acoustic transducer adapted for being impacted by particulate matter in said flow path;

said impact surface being located in said particulate flow path;

an electrical signal generator connected to said acoustic transducer and adapted for generating an electrical signal in response to sound waves created by particulate matter impact;

said signal generator including an output adapted for providing an electrical output signal corresponding to said sound waves;

a processor connected to said signal generator output;

said processor being programmed to monitor particulate flow based on said detected particulate matter impact;

said acoustic transducer comprising an impact plate with said impact surface and a transducer housing mounting said impact plate and enclosing an acoustic chamber therewith;

a pneumatic impulse line comprising a first end and a second end, wherein said first end is connected to said acoustic chamber; and

said electrical signal generator including a microphone, wherein said microphone is connected to said second end of said impulse line.

2. The flow monitor according to claim 1 , wherein said microphone is a micro electrical mechanical system (MEMS) microphone.

3. The flow monitor according to claim 2 , which includes:

a communications module connected to said processor and adapted for outputting a signal corresponding to said particulate flow.

4. The flow monitor according to claim 1 wherein said system is pneumatic and includes a blower connected to said flow tube.

5. The flow monitor according to claim 4 , which includes:

an elbow mounted in said flow tube and forming a particulate flow path turn from a first particulate flow path direction to a second particulate flow path direction; and

said acoustic transducer housing being mounted on said elbow with said impact plate located at said particulate flow path turn and adapted for deflecting particulate from said first flow path direction to said second flow path direction.

6. The flow monitor according to claim 5 , which includes:

said transducer housing being shaped so as to direct said sound waves from said impact plate toward an outlet opening positioned in spaced relation from said impact plate;

said pneumatic impulse line being connected to said outlet opening; and

said impact plate being mounted on said transducer housing and forming flow path angles with said first and second particulate flow path directions.

7. The flow monitor according to claim 4 , which includes:

said processor being programmed with a flow interrupt function adapted for detecting a particulate flow interruption through said flow tube;

said flow interrupt function including an output signal associated with a particulate flow interruption; and

a flow interrupt alarm receiving said flow interruption signal and alerting an operator to said interrupted particulate flow condition.

8. The flow monitor according to claim 7 wherein said flow interrupt function comprises:

a predetermined particulate flow rate threshold;

a falling flow rate timer including a below-threshold-while-falling maximum duration;

a below-threshold steady-state flow rate timer including a below-threshold steady-state maximum duration;

a rising flow rate timer including a below-threshold-while-rising maximum duration; and

said flow interrupt function actuating said flow interrupt alarm in response to one of said maximum durations being exceeded.

9. The flow monitor according to claim 4 , which includes:

said particulate matter comprising seed;

multiple said flow tubes;

multiple seed hoppers connected to said flow tubes;

multiple blowers connected to said flow tubes;

multiple said acoustic transducers each located in a respective flow tube;

multiple flow restrictors each located in a respective flow tube and located downstream from a respective transducer; and

multiple discharges each associated with a respective ground-working implement and adapted for depositing seed in a furrow.

10. A particulate flow monitor for a system including a particulate flow tube defining a particulate flow path and the flow tube terminating at a particulate discharge, which flow monitor comprises:

an acoustic transducer connected to the flow tube intermediate the blower and the discharge;

said acoustic transducer being located in said particulate flow path;

an impact surface on said acoustic transducer adapted for being impacted by particulate matter in said flow path;

said impact surface being located in said particulate flow path;

an electrical signal generator connected to said acoustic transducer and adapted for generating an electrical signal in response to sound waves created by particulate matter impact;

said signal generator including an output adapted for providing an electrical output signal corresponding to said sound waves;

a processor connected to said signal generator output;

said processor being programmed to monitor particulate flow based on said detected particulate matter impact;

said system being pneumatic and including a blower connected to said flow tube;

said processor being programmed with a flow interrupt function adapted for detecting a particulate flow interruption through said flow tube;

said flow interrupt function including an output signal associated with a particulate flow interruption;

a flow interrupt alarm receiving said flow interruption signal and alerting an operator to said interrupted particulate flow condition; and

said flow interrupt function including: 1) a predetermined particulate flow rate threshold; 2) a falling flow rate timer including a below-threshold-while-falling maximum duration; 3) a below-threshold steady-state flow rate timer including a below-threshold steady-state maximum duration; 4) a rising flow rate timer including a below-threshold-while-rising maximum duration; and 5) said flow interrupt function actuating said flow interrupt alarm in response to one of said maximum durations being exceeded.

11. A particulate flow monitor for a system including a particulate flow tube defining a particulate flow path and the flow tube terminating at a particulate discharge, which flow monitor comprises:

an acoustic transducer connected to the flow tube intermediate the blower and the discharge;

an impact surface on said acoustic transducer adapted for being impacted by particulate matter in said flow path;

said impact surface being located in said particulate flow path;

an electrical signal generator connected to said acoustic transducer and adapted for generating an electrical signal in response to sound waves created by particulate matter impact;

said signal generator including an output adapted for providing an electrical output signal corresponding to said sound waves;

a processor connected to said signal generator output;

said processor being programmed to monitor particulate flow based on said detected particulate matter impact;

said system being pneumatic and including a blower connected to said flow tube;

said processor being programmed with a flow interrupt function adapted for detecting a particulate flow interruption through said flow tube;

said flow interrupt function including an output signal associated with a particulate flow interruption;

a flow interrupt alarm receiving said flow interruption signal and alerting an operator to said interrupted particulate flow condition; and

said flow interrupt function including: 1) a predetermined particulate flow rate threshold; 2) a falling flow rate timer including a below-threshold-while-falling maximum duration; 3) a below-threshold steady-state flow rate timer including a below-threshold steady-state maximum duration; 4) a rising flow rate timer including a below-threshold-while-rising maximum duration; and 5) said flow interrupt function actuating said flow interrupt alarm in response to one of said maximum durations being exceeded.