Monitoring an operating condition of an HVAC flow regulator

An HVAC flow regulator monitoring system for monitoring an operating condition of a controllable flow regulator in a flow channel of an HVAC system, the monitoring system comprising:

• a sonic transmitter for transmitting a sonic signal directly or indirectly to the flow regulator, and an electronic driver for driving the transmitter, the sonic signal being distinguished from background noise by being at least one of:
• (i) modulated according to a modulation schema;
• (ii) an ultrasonic signal;
• (iii) a frequency selected to be away from background noise;
• a sonic receiver for detecting the transmitted signal after interacting with the flow regulator;
• and outputting a received signal;
• and
• an electronic signal processor coupled to the receiver, and responsive at least to the received signal, for determining the operating condition of the flow regulator;
• wherein the operating condition is or comprises one or more of:
• (i) a degree of fluid-tightness of the flow regulator when in a closed condition;
• (ii) the presence or absence of a leakage path through the flow regulator when in a closed condition;
• (iii) at least one of a closure state and a closed position of the flow regulator;
• (iv) detection that the flow regulator is in a closed state;
• (v) a physical position of a movable flow control member of the flow regulator:
• (vi) evolution over time of the physical position of a movable flow control member when cycled to the closed condition;
• (vii) evolution over time of leak paths through the flow regulator when cycled to the closed condition;
• (vii) an indication of where around a perimeter of a flow control member a leakage path is detected to exist, based on a time interval between emitting of the signal into the flow channel, and reception of the signal from the flow channel;
• (vi) at least one of an amount of hysteresis in the flow regulator and an actuator of the flow regulator;
• (vii) at least one of distortion and wear of a seal component of the flow regulator:
• (viii) indication of at least one of a current and a forthcoming malfunction of at least one of the flow regulator and an actuator of the flow regulator;
• (ix) the degree of intactness of a flow control member of the flow regulator:
• (x) indication of foreign matter in the flow channel in the vicinity of the flow regulator selected from the group consisting of accumulation of deposits, contamination of the fluid, and pollution of the fluid;
• (xi) a physical position of a movable vane of the flow regulator;
• (xii) at least one of distortion and wear of at least one seal component of the flow regulator selected from the group consisting of a seal member, a seal seat, and a seal liner.

An HVAC flow regulator actuator for actuating a flow regulator for regulating flow in a flow channel of an HVAC system, the actuator comprising:

• an electro-mechanical driver for driving movement of an actuator member, for actuating the flow regulator;
• and
• controller circuitry comprising:
• at least one output coupled to the electro-mechanical driver for commanding operation of the electro-mechanical driver;
• and
• at least one input for receiving an input signal from a sonic receiver for receiving a sonic signal from at least one of the flow channel and the flow regulator;
• wherein the controller circuitry is operable to:
• identify whether the input signal comprises a component corresponding to at least one of a predetermined modulation schema and an ultrasonic signal component, wherein
• the ultrasonic signal component carries digitally coded information;
• the digitally coded information comprises a reference bit sequence;
• and
• auto-correlation values for all non-zero shifts of the reference bit sequence do not exceed 25% of an auto-correlation value at zero shift, and
• in response to the identification step, determine an operating condition associated with at least one of the flow regulator and the actuator.

A method of detecting an operating condition of a controllable flow regulator in a fluid flow channel of an HVAC system, the method comprising the steps of:

• (a) transmitting a sonic signal, from a sonic transmitter, directly or indirectly to the flow regulator, the sonic signal being distinguished from background noise by being (i) modulated according to a modulation schema and (ii) an ultrasonic signal;
• (b) receiving a signal from a sonic receiver for detecting the transmitted signal after interacting with the flow regulator;
• and
• (c) determining, in an electronic signal processor, the operating condition of the flow regulator on the basis of at least the signal received in the receiving step (b);
• wherein
• the modulated signal carries a digitally coded information;
• the digitally coded information comprises a reference bit sequence;
• and
• auto-correlation values for all non-zero shifts of the reference bit sequence do not exceed 25% of an auto-correlation value at zero shift.

A method of detecting an operating condition of a controllable flow regulator in a fluid flow channel of an HVAC system, the method comprising the steps of:

• (a) transmitting a sonic signal, from a sonic transmitter, directly or indirectly to the flow regulator, the sonic signal being distinguished from background noise by being at least one of:
• (i) modulated according to a modulation schema, (ii) an ultrasonic signal, (iii) a frequency selected to be away from background noise;
• (b) receiving a signal from a sonic receiver for detecting the transmitted signal after interacting with the flow regulator;
• and
• (c) determining, in an electronic signal processor, the operating condition of the flow regulator on the basis of at least the signal received in the receiving step (b);
• wherein the received signal is processed to determine one or more of:
• presence or absence of the transmitted signal in a signal received from the flow channel;
• (ii) an amplitude of the received signal;
• (iii) a comparison of the received signal, and at least one threshold;
• (iv) a degree of attenuation of the received signal compared to the transmitted signal, as the flow regulator cycles between an open condition and a closed condition;
• (v) at least one of a time interval and time of flight, between transmission of the signal into the flow channel, and reception of the transmitted signal from the flow channel;
• (vi) at least one of a respective phase, phase difference, and phase range for a plurality of phase-distributed signal components received from the flow channel;
• (vii) a respective signal to noise ratio for each of a plurality of different operating frequency channels;
• (viii) a measurement of noise different from the transmitted signal;
• (ix) a comparison of the received signal, and at least one threshold for discriminating between fluid-tight and non-fluid-tight conditions;
• (x) a comparison of the received signal, and at least one threshold for discriminating between obstructed and unobstructed flow path conditions;
• (xi) a respective signal to noise ratio for each of a plurality of different operating frequency channels for selecting between operating frequency channels in situ.