What is claimed is:
1. A constrained layer damping system for use in an integrated air fuel module having a control module mounted thereon, said constrained layer damping system comprising:
a control module coated with an encapsulant;
a wiring harness coated with an encapsulant and extending from said control module;
a first layer of formed material on a first side of said wiring harness and a first side of said control module; and
a second layer of formed material on a second side of said wiring harness and a second side of said control module.
2. The constrained layer damping system of claim 1, wherein said first layer is an intake manifold plenum cover.
3. The constrained layer damping system of claim 2, wherein said encapsulant is silicon gel.
4. The constrained layer damping system of claim 3, wherein said first and said second layers are bonded to said wiring harness and said control module.
5. The constrained layer damping system of claim 3, wherein said second layer is bonded to said control module and said control module is attached to said intake manifold cover with a thermally conductive tape.
6. The constrained layer damping system of claim 4, wherein said wiring harness is attached to said intake manifold plenum cover by fasteners.
7. The constrained layer damping system of claim 4, wherein said intake manifold plenum cover is plastic.
8. The constrained layer damping system of claim 4, wherein said intake manifold plenum cover is metal.
9. The constrained layer damping system of claim 8, wherein said second layer is metal.
10. The constrained layer damping system of claim 8, wherein said second layer is plastic.
11. The constrained layer damping system of claim 10, wherein said wiring harness extends from said control module and connects to at least one ignition coil and at least one fuel injector.
12. A constrained layer damping system, said constrained layer damping system comprising:
a wiring harness coated with an encapsulant;
a first layer of formed material on a first side of said wiring harness; and
a second layer of formed material attached to a second side of said wiring harness such that said wiring harness is between said first and said second layers.
13. A method for reducing the effects of noise emitted from a powertrain and electromagnetic interference on a control module, said method comprising the steps of:
providing a control module with a wiring harness extending therefrom;
encapsulating said control module and said wiring harness with a damping material;
mounting said control module on an air intake manifold plenum cover; and
mounting a constraining layer of material on the side of said control module and said wiring harness opposite said air intake manifold plenum cover.
14. The method of claim 13, further comprising the step of cooling said control module by using said air intake manifold plenum cover as a heat sink.
15. The method of claim 14, wherein the airflow into said air intake manifold plenum cover dissipates heat from said control module.
16. The method of claim 15, wherein said encapsulant is a silicon gel.
17. The method of claim 16, wherein said air intake manifold plenum cover is metal and serves to reduce the effect of electromagnetic interference on said control module.
18. The method of claim 17, wherein said constraining layer is plastic.
19. The method of claim 17, wherein said constraining layer is metal.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for generating a synchronization clock signal for a receiver, comprising:
partially removing phase with lag from a spread spectrum signal by using an autocorrelation filter;
generating a first correlation and a second correlation using respective correlators configured to receive the output of the autocorrelation filter;
comparing the first correlation and the second correlation using a comparator to locate a peak correlation and produce a corresponding comparator output;
controlling a voltage controlled oscillator by using the comparator output; and
producing the synchronization clock signal by using an output of the voltage controlled oscillator.
2. The method of claim 1 further comprising:
locating the peak correlation by using the comparator to locate the first correlation on the less delayed side of the peak correlation and locate the second correlation on the more delayed side of the peak correlation.
3. The method of claim 2 further comprising:
generating a first delayed input for the first correlation and a second delayed input for the second correlation, the first delayed input and the second delayed input produced using a delay line.
4. The method of claim 1 further comprising:
centering the peak correlation between the first correlation and the second correlation by shifting a plurality of samples of the output of the autocorrelation filter.
5. The method of claim 4 further comprising:
shifting the samples by an integer amount to center the peak correlation between the first correlation and the second correlation.
6. A system for generating a synchronization clock signal for a receiver, the system comprising:
an autocorrelation filter arranged to partially remove phase with lag from a spread spectrum signal;
a first and second correlator arranged to receive the output of the autocorrelation filter and to generate a first correlation and a second correlation, respectively;
a comparator to compare the first correlation to the second correlation to locate a peak correlation and produce a corresponding comparator output; and
a voltage controlled oscillator that is controlled by the comparator output and that produces an output for use as the synchronization clock signal.
7. The system of claim 6, wherein the comparator is configured to locate the peak correlation by locating the first correlation on the less delayed side of the peak correlation and locating the second correlation on the more delayed side of the peak correlation.
8. The system of claim 7 further comprising:
a delay line arranged to produce a first delayed input for the first correlation and a second delayed input for the second correlation.
9. The system of claim 6 further comprising:
a shifter to center the peak correlation between the first correlation and the second correlation by shifting a plurality of samples of the output of the autocorrelation filter.
10. The system of claim 9, wherein the shifter is further arranged to shift the samples by an integer amount to center the peak correlation between the first correlation and the second correlation.
11. The system of claim 6, wherein the autocorrelation filter includes a delay unit and a correlator array located after the delay unit.
12. The system of claim 11, wherein the autocorrelation filter further includes an integrator array located after the correlator array.
13. The method of claim 1, wherein partially removing phase with lag from a spread spectrum signal by using an autocorrelation filter comprises:
providing the spread spectrum signal to a delay unit; and
providing an output from the delay unit to a correlator array.
14. The method of claim 13, wherein partially removing phase with lag from a spread spectrum signal by using an autocorrelation filter further comprises providing an output from the correlator array to an integrator array.