초록 ▼

An implement position control device including a central processing unit (6) coupled to an ultrasonic transducer (17) and receiver/amplifier (20) adapted to calculate the distance to a reference target (12 and a relatively more distant surface (9). Control pulses are initiated by the CPU (6) to mani

An implement position control device including a central processing unit (6) coupled to an ultrasonic transducer (17) and receiver/amplifier (20) adapted to calculate the distance to a reference target (12 and a relatively more distant surface (9). Control pulses are initiated by the CPU (6) to manipulate a solenoid (25) by means of a valve driver (24) in response to the calculated distance measurements. An autotune task (26) causes a series of precise pulses to manipulate the solenoid, thereby permitting calculation of the transfer function (52) defining the relationship between pulse width and implement position.

대표청구항 ▼

A method of controlling the position of an implement in relationship to a surface, comprising the steps of: (a) selecting a desired relationship between the implement and the surface; (b) emitting a sonic wave; (c) detecting echoes produced by the reflection of the sonic wave from the surface; and (

A method of controlling the position of an implement in relationship to a surface, comprising the steps of: (a) selecting a desired relationship between the implement and the surface; (b) emitting a sonic wave; (c) detecting echoes produced by the reflection of the sonic wave from the surface; and (d) generating a correction signal which causes the implement to alter its relationship to the surface if a difference between a desired distance and a measured distance exceeds a certain amount, wherein a transfer function defining a relationship between the difference and the correction signal magnitude is linear.