Servovalve analyzer system

Claim 1

A system for driving an excitation means of a hydraulic unit under test with a precise signal in a predetermined sequence, comprising: digital processor means providing a plurality of command signals for the predetermined sequence on a digital bus; analog command signal bus means comprising a number of analog command signal lines; digital to analog converter means coupling the digital bus to the analog command signal bus means; sensing transducer means comprising a plurality of sensing transducers providing individual signals representative of unit under test operation of different analog input signal lines forming an analog input signal bus; first analog signal summing means connected to the analog command signal bus and responsive to digital command signals on the digital bus for summing selected analog command signals as controlled by digital command signals; second analog signal summing means connected to the analog input signal bus and responsive to digital command signals on the digital bus for summing selected analog input signals as controlled by digital command signals; and means for combining the outputs of the first and second summing means as an excitation signal.

Claim 2

A system for driving an excitation means of a hydraulic unit under test with a precise signal in a predetermined sequence, comprising: digital processor means providing a plurality of command signals for the predetermined sequence on a digital bus; analog command signal bus means comprising a number of analog command signal lines; digital to analog converter means coupling the digital bus to the analog command signal bus means; sensing transducer means comprising a plurality of sensing transducers providing individual signals representative of unit under test operation of different analog input signal lines forming an analog input signal bus; first analog signal summing means connected to the analog command signal bus and responsive to digital command signals on the digital bus for summing selected analog command signals as controlled by digital command signals; second analog signal summing means connected to the analog input signal bus and responsive to digital command signals on the digital bus for summing selected analog input signals as controlled by digital command signals; and means for combining the outputs of the first and second summing means as an excitation signal.

Claim 4

A system for testing a hydraulic unit under test having excitation means to derive a number of operating parameters under a sequence of test conditions using a hydraulic power source, comprising: a digital processor comprising a digital data bus for transferring digital commands and digital outputs, the digital commands defining a test sequence; analog command signal bus means comprising a plurality of analog command signal lines; digital to analog converter means responsive to the digital commands on the digital data bus and providing commands on selected analog command signal lines; servoamplifier means coupled to the digital data bus and the selected analog command signal lines for operating the excitation means in a controlled sequence; a plurality of different transducer means coupled to the unit under test for sensing different parameters of operation; analog input signal bus means comprising a plurality of input signal lines, each coupled to receive different transducer signals; and analog to digital converter means coupling the analog input signal bus to the digital bus for the digital processor.

Claim 5

A system for testing a hydraulic unit under test having excitation means to derive a number of operating parameters under a sequence of test conditions using a hydraulic power source, comprising: a digital processor comprising a digital data bus for transferring digital commands and digital outputs, the digital commands defining a test sequence; analog command signal bus means comprising a plurality of analog command signal lines; digital to analog converter means responsive to the digital commands on the digital data bus and providing commands on selected analog command signal lines; servoamplifier means coupled to the digital data bus and the selected analog command signal lines for operating the excitation means in a controlled sequence; a plurality of different transducer means coupled to the unit under test for sensing different parameters of operation; analog input signal bus means comprising a plurality of input signal lines, each coupled to receive different transducer signals; and analog to digital converter means coupling the analog input signal bus to the digital bus for the digital processor.