Method for automatic position control of a tool

Details Method for automatic position control of a tool Method for automatic position control of a tool

1988-06-09

1990-05-08

Ruggiero, Joseph

Boots, shoes, and leggings

172 45, 36442407, 364561, 367127, G06F 1520, G05D 104

Patent

active

049243748

ABSTRACT:
A method and apparatus for automaticlly controlling the position of a tool carried by a machine, which in the preferred embodiment may be the blade of a grader or paver for leveling a surface at a chosen depth. The method includes determination of time taken for an acoustic pulse to travel from a transducer to a reference surface and back, with this value being used to calibrate a microprocessor-controlled distance-measuring device. As the grader moves over a surface to be graded, the distance to the reference surface is constantly detected by a repeated emission and detection of such acoustic pulses. The timing of the echoed pulses is converted to addresses in a look-up table which contains control words symbolizing commands to be given to hydraulic rams carried by the grader. By implementing these commands, the depth of the blade relative to the reference surface is constantly updated, compensating for variations with the height of the reference surface. A thermistor is provided to automatically compensate for temperature variations as the grading takes place. Displays are provided for the operator of the vehicle to show what type of adjustments are being made to the blade, and whether the height of the reference surface is outside the range of sensitivity of the follower. The follower is automatically calibrated for a given blade depth by repeated incrementation of a delay time variable until a zero adjustment command is generated for the blade control.

REFERENCES:
patent: 2780795 (1957-02-01), Ambrosio
patent: 3495663 (1970-02-01), Scholl et al.
patent: 3554291 (1971-01-01), Rogers et al.
patent: 3561538 (1971-02-01), Curlett et al.
patent: 3609671 (1971-09-01), Webster et al.
patent: 3637026 (1972-01-01), Snow
patent: 3974699 (1976-08-01), Morris et al.
patent: 4263973 (1981-04-01), Boulais et al.
patent: 4365301 (1982-12-01), Arnold et al.
patent: 4371942 (1983-02-01), Damikolas
patent: 4428055 (1984-01-01), Zurbrick et al.
patent: 4439846 (1984-03-01), Rodriquez
patent: 4567766 (1986-02-01), Seiferling
patent: 4581726 (1986-04-01), Makino et al.
patent: 4604681 (1986-08-01), Sakashita
patent: 4663712 (1987-05-01), Kishida
patent: 4733355 (1988-03-01), Davidson et al.
patent: 4775940 (1988-10-01), Nishida et al.
patent: 4818925 (1989-04-01), Lahm et al.
Spectra-Physics Construction & Agricultural Division Laserplane.RTM. Technical brochure, No. 22481-016, 1986, Dayton, Ohio.

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