Distance measurement and control using coded sonic signals

Details Distance measurement and control using coded sonic signals Distance measurement and control using coded sonic signals

1991-04-24

1992-10-20

Melius, Terry Lee

Harvesters

Motorized harvester

With condition-responsive operation

56DIG15, 172 45, A01D 4700, A01D 7528

Patent

active

051559838

ABSTRACT:
An agricultural harvesting machine having a cutting element movably supported thereon is provided with a height sensor including a transmitter and a receiver mounted for movement with the cutting element. The transmitter directs bursts of sound waves in the range of about 5 KHz toward the ground and echoes of the bursts are picked up by the receiver, the elapsed time between transmission and reception being an indication of the height of the cutting element above the ground. To distinguish between echoes of the bursts and environmental noise picked up by the receiver, the bursts are encoded by transmitting them in pairs, the bursts of a pair being of fixed duration and separated by a fixed interval of time. The duration of each signal and the time spacing between signals is checked and if they are not of the correct duration or are not separated by the fixed interval of time they are rejected as noise. The time between transmission and reception of a burst is measured to provide an indication of the height of the cutting element. The measured height is compared with a reference or desired height and the difference value is used to control movement of the cutting element to the desired height.

REFERENCES:
patent: 4228636 (1980-10-01), Homburg
patent: 4414792 (1983-11-01), Bettencourt et al.
patent: 4507910 (1985-04-01), Thornley et al.
patent: 4569037 (1986-02-01), Seiferling
patent: 4573124 (1986-02-01), Seiferling
patent: 4641490 (1987-02-01), Wynn et al.
patent: 4663712 (1987-05-01), Kishida
patent: 4896486 (1990-01-01), Lundahl et al.
patent: 4918608 (1990-04-01), Middleton et al.
patent: 4924374 (1990-05-01), Middleton et al.

Affiliated with

Also associated with

Rating

Distance measurement and control using coded sonic signals does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Distance measurement and control using coded sonic signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Distance measurement and control using coded sonic signals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-185423