US4679633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for depth adjustment of a tilling machine
Assignee: Bosch Rexroth AG
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Filing: 1984-09-13
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Granted: 1987-07-14
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Expires: 2004-09-13
Abstract
Abstract A method and apparatus for adjusting the working depth of a soil-moving (soil-working, tilling) machine carried by a tractor includes adjusting the position of the machine in relation to the tractor in dependence upon a traction signal and upon a position signal. The traction signal corresponds to the traction produced on the machine in the soil and the position signal corresponds to the position of the machine in relation to the tractor. A portion of the traction signal above a certain cut-off frequency and a portion of the position signal below the same cut-off frequency or below a lower one are utilized in the adjusting control.
Inventors
- 👤 Wolfgang Kauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:30
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; A01B63/1117
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
168 words
A method for adjusting the working depth of a soil-tilling machine that is carried by a tractor, the position of the soil-tilling machine being adjusted in relation to the tractor, said method comprising extracting by a first control loop a high frequency component of a traction signal equal to, at the least, a predetermined cut-off frequency, said traction signal representing the traction as produced on the soil-tilling machine in the soil, extracting by a second control loop a low frequency component of a position signal equal to, at the most, said predetermined cut-off frequency, said position signal representing the position of the soil-tilling machine in relation to the tractor, mixing said extracted components only of said traction and position signals to generate an adjusting signal for controlling the elevation of the soil-tilling machine with respect to the tractor by keeping said first control loop and said second control loop separate so that the elevation adjustments caused by said traction signal and said position signal, respectively, are mutually independent.
Claim 2
Independent Claim
168 words
A method for adjusting the working depth of a soil-tilling machine that is carried by a tractor, the position of the soil-tilling machine being adjusted in relation to the tractor, said method comprising extracting by a first control loop a high frequency component of a traction signal equal to, at the least, a predetermined cut-off frequency, said traction signal representing the traction as produced on the soil-tilling machine in the soil, extracting by a second control loop a low frequency component of a position signal equal to, at the most, said predetermined cut-off frequency, said position signal representing the position of the soil-tilling machine in relation to the tractor, mixing said extracted components only of said traction and position signals to generate an adjusting signal for controlling the elevation of the soil-tilling machine with respect to the tractor by keeping said first control loop and said second control loop separate so that the elevation adjustments caused by said traction signal and said position signal, respectively, are mutually independent.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1, wherein said traction high frequency component and said position low frequency component are equal.
Claim 4
Dependent Claim
21 words
A method as claimed in claim 1, wherein said position low frequency component is less than said traction high frequency component.
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1, wherein said predetermined cut-off frequency equals approximately 1 Hz.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 1, wherein, during the mixing process for generating said adjusting signal, the mixing ratio of traction signal and position signal is adjusted.
Claim 7
Dependent Claim
24 words
A method as claimed in claim 1, wherein said position signal is composed of an actual position signal and or a desired position signal.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 1, wherein said traction signal is composed of an actual traction signal and of a desired traction signal.
Claim 9
Dependent Claim
19 words
A method as claimed in claim 1 wherein the amount of traction signal and position signal extracted is adjustable.
Claim 10
Dependent Claim
30 words
A method as claimed in claim 1 including the step of controllably avoiding the extraction of components of selectively one of said traction and said position signals prior to mixing.
Claim 11
Dependent Claim
25 words
A method as claimed in claim 1 including the step of altering the mixing ratio between the extracted components of said traction and position signals.
Claim 12
Dependent Claim
22 words
A method as claimed in claim 1 including the step of mechanically obtaining and extracting components of said traction and position signals.
Claim 13
Dependent Claim
22 words
A method as claimed in claim 1 including the step of hydraulically obtaining and extracting components of said traction and position signals.
Claim 14
Dependent Claim
13 words
A method as claimed in claim 12 wherein the hydraulic extraction is adjustable.
Claim 15
Dependent Claim
22 words
A method as claimed in claim 1 including the step of electrically obtaining and extracting components of said traction and position signals.
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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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |