Control circuit for an electrically controlled servo device
First Claim
1. A control circuit including a set point adjuster for an electrically controlled device for actuating a power member, in particular for a controlled device having a non-linear or linear non-continuous response curve, including a microprocessor for receiving a desired magnitude for the controlled device and for delivering a control magnitude for said controlled device and further including a memory connected to said microprocessor, characterized in that the response curve of the controlled device actuating said power member is stored in said memory, said response curve being composed of a number of input magnitudes and correlated output magnitudes of said controlled device, that for controlling the controlled device the desired magnitude corresponding to a desired output magnitude of the response curve is supplied to the microprocessor and that an input magnitude linearly correlated to said desired output magnitude is read-out from the memory, said input magnitude defining a control signal indicative of said control magnitude which is delivered to said controlled device, and wherein the sensitivity of the set point adjuster is modified by modifying the input or output magnitudes of the response curve stored in said memory using an offset value and a distortion factor.
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Accused Products
Abstract
A control circuit includes a microprocessor, a table store and an amplifier stage to control a controlled device which has a non-linear or linear, but discontinuous response curve. To obtain a linear response curve of the controlled device the table store is loaded with a response curve map in operating the controlled device. Thereafter the data loaded in pairs in the table store are inversely read-out and used as a control signal for the controlled device. The table store thus allows to linearize the response curve of the controlled device. In addition the data may be modified. According to the invention any correcting means to obtain an ideal response of the controlled device is eliminated. The invention provides for an optimum performance, smallest possible expenditure of circuitry and shortest possible control time.
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Citations
13 Claims
- 1. A control circuit including a set point adjuster for an electrically controlled device for actuating a power member, in particular for a controlled device having a non-linear or linear non-continuous response curve, including a microprocessor for receiving a desired magnitude for the controlled device and for delivering a control magnitude for said controlled device and further including a memory connected to said microprocessor, characterized in that the response curve of the controlled device actuating said power member is stored in said memory, said response curve being composed of a number of input magnitudes and correlated output magnitudes of said controlled device, that for controlling the controlled device the desired magnitude corresponding to a desired output magnitude of the response curve is supplied to the microprocessor and that an input magnitude linearly correlated to said desired output magnitude is read-out from the memory, said input magnitude defining a control signal indicative of said control magnitude which is delivered to said controlled device, and wherein the sensitivity of the set point adjuster is modified by modifying the input or output magnitudes of the response curve stored in said memory using an offset value and a distortion factor.
- 4. In a hydraulic system including a controlled device and a pump, a set point adjuster and a control circuit for controlling the controlled device by an electrical signal, including a microprocessor for receiving a desired magnitude for the controlled device and for delivering a control magnitude for the controlled device and further including a memory connected to said microprocessor, wherein the memory is loaded with pairs each of input magnitudes and correlated output magnitudes of the controlled device defining a family of response curves representing the stroke of the controlled device, flow through the controlled device, pressure controlled by the controlled device or the output power of the pump, wherein for controlling the controlled device the desired magnitude corresponding to a desired output magnitude of the response curve is supplied to the microprocessor, wherein an input magnitude linearly correlated to the desired output magnitude is read-out from the memory, said input magnitude defining a control signal indicative of the control magnitude which is delivered to the controlled device and wherein the sensitivity of the set point adjuster is modified by modifying the input or output magnitudes of the response curves stored in said memory using an offset value and a distortion factor.
Specification