Proactive aerodynamic truck trailer shroud

1. An autonomous power source for extensible side fairings on a vehicle comprises:

a fluid power system comprising at least one of a rotary power mechanism, including an air screw or a turbine and a pneumatic system, including a cylinder, for generating power disposed on the vehicle to be exposed to air flowing along a side of the vehicle resulting from forward movement of the vehicle for generating power from the air flowing along the side of the vehicle; and

a coupling mechanism actuated by power generated by the fluid power system for controlling extension of the extensible fairings.

2. An autonomous power source as claimed in claim 1 , the fluid power system further comprising:

a rotary power mechanism for converting airflow to mechanical energy; and

a reversal mechanism allowing the rotary power mechanism to operate either to extend the fairings or retract the fairings.

3. An autonomous power source as claimed in claim 1 , the fluid power system further comprising:

a pneumatic linkage to the extensible fairings.

4. An autonomous power source as claimed in claim 3 , further comprising:

an energy storage system coupled to the pneumatic linkage and responsive to a reduction in pneumatic power for urging the extensible fairings to a retracted position.

5. An autonomous power source as claimed in claim 3 , further comprising:

springs connected between panels of the extensible fairing system for urging the extensible fairings toward a retracted position.

6. An autonomous power source as claimed in claim 1 , further comprising:

a velocity sensor; and

an active control system responsive to the velocity sensor for controlling the fluid power system.

7. An autonomous power source as claimed in claim 6 , further comprising:

the velocity sensor being airflow responsive.

8. An autonomous power source as claimed in claim 6 , further comprising:

a vehicle articulation sensor;

the velocity sensor being coupled to the vehicle power train;

a fairings displacement sensor; and

the control system being further responsive to velocity or articulation of the vehicle for adjusting extension of the extensible fairings on either or both sides of the vehicle.

9. An adjustable aerodynamic truck to trailer shroud system, the system comprising:

driver and passenger side shrouds, the shrouds being adjustable in length and operable to be disposed in a gap extending between a back end of the tractor and a front end of the trailer;

a fluid power system for adjusting the lengths of the shrouds;

a speed sensor operable to sense a speed of the vehicle; and

a control system coupled in signal communication with the speed sensor and further coupled for operation of the fluid power system, wherein the control system is operable to automatically adjust a longitudinal length of shrouds of the shrouds in response to vehicle speed.

10. The shroud system of claim 9 , the fluid power system further comprising:

a rotary mechanism for converting airflow to mechanical energy; and

a reversal mechanism allowing the rotary mechanism to operator to operate either to extend the shrouds or retract the shrouds.

11. The shroud system of claim 9 , the fluid power system further comprising:

a pneumatic linkage to the shrouds.

12. An autonomous power source as claimed in claim 11 , further comprising:

an energy storage system coupled to the pneumatic linkage and responsive to a reduction in pneumatic power for urging the extensible shrouds to a retracted position.

13. An autonomous power source as claimed in claim 11 , further comprising:

springs connected between panels of the shrouds for urging the shrouds toward a retracted position.