Apparatus and methods for controlling a signal device

• US 5,355,119 A
• Filed: 12/14/1990
• Issued: 10/11/1994
• Est. Priority Date: 09/20/1988
• Status: Expired due to Fees

• Current Assignee: Code 3 Incorporated (Halliburton Company)
• Original Assignee: Public Safety Equipment Incorporated
• Inventors: Pearlman, Barry S.
• Primary Examiner(s): Yusko, Donald J.
• Assistant Examiner(s): Giust, John
• Application Number:
  US07/629,070
• Time in Patent Office: 1,397 Days
• Field of Search: 340/331, 340/471, 340/468, 340/472, 340/477, 340/478, 340/825.06, 315/81, 315/82, 315/83, 315/200 A, 307/10.8, 307/10 AT
• US Class Current: 340/468
• CPC Class Codes: B60Q 1/2611 Indicating devices mounted on the roof of the vehicle
• CPC Class Codes: B60Q 1/46 for giving flashing caution signals during drive, other than signalling change of direction, e.g. flashing the headlights or hazard lights
• CPC Class Codes: G08B 5/38 using flashing light

Abstract

Apparatus and method for controlling a signal device for energization by an electrical source. The apparatus includes circuitry for producing digital cycles on an output line wherein each digital cycle includes a sequence of pulses and spaces, each cycle having at least two pulses that differ in duration and at least two spaces that differ in duration. The apparatus also includes circuitry connected to the output line and responsive to the circuitry for producing the digital cycles for applying electrical energization from the electrical source to the signal device in accordance with the pulses in the digital cycles.

Claims

1. Apparatus for controlling at least two signal devices for energization by an electrical source comprising:

means for repeatedly producing different first and second concurrent digital cycles each on an output line wherein each digital cycle includes a sequence of alternating pulses and spaces, each cycle having at least two pulses that differ in duration with respect to each other and having at least two spaces that differ in duration with respect to each other wherein said means for producing digital cycles includes memory means for storing the digital cycles with each of the digital cycles including a plurality of digital values representative of the duration of the pulses and spaces, means for producing the digital cycles in different modes in response to a mode input, and counter means for addressing said memory means in a predetermined sequence, said memory means successively supplying the digital values in sequence to said output line;

means connected to the output line and responsive to said means for producing the digital cycles for applying electrical energization from the electrical source to each one of the signal devices concurrently in accordance with the pulses in the digital cycles and for not applying electrical energization from the electrical source to the signal devices in accordance with the spaces in the digital cycles; and

wherein said means for producing the digital cycles includes an oscillator having an alterable repetition rate, and means responsive to the oscillator for concurrently generating a control signal for selectively altering the repetition rate of the oscillator at least once during each digital cycle.

2. Apparatus as set forth in claim 1 wherein said memory means includes means for storing a reset bit and having an output connected to said counter means for the reset bit to reset said counter means when each digital cycles is completed.

3. Apparatus as set forth in claim 1 wherein each of the pulses and spaces in each cycle exceed one-tenth second in duration.

4. Apparatus as set forth in claim 1 wherein said means for producing the digital cycles includes means for producing the digital cycles in different modes in response to a mode input, and said means for applying electrical energization requires power for its own operation from the electrical source, the apparatus further comprising first switch means for connecting the electrical source to said means for applying electrical energization, said means for producing digital cycles operating in a first mode when said first switch means is on.

5. Apparatus as set forth in claim 4 further comprising mode shifting switch means for selectively connecting the electrical source to the mode input to operate said means for producing digital cycles in a different mode, and power being supplied through said mode shifting switch means to said means for applying electrical energization when said mode shifting switch means is on.

6. Apparatus as set forth in claim 5 further comprising unidirectional conduction means for connecting said mode shifting switch means to said means for applying, to independently power the operation of said means for applying through said mode shifting switch means when it shifts to tile different mode.

7. Apparatus as set forth in claim 1 wherein said means for producing the digital signals includes an electronic memory and said means for applying electrical energization includes a buffer circuit fed by said electronic memory and a relay fed by said buffer circuit for controlling the signal device.

8. Apparatus as set forth in claim 1 wherein said means for producing the digital signals includes an electronic memory with address inputs, the apparatus further comprising at least one mode switch coupled to at least one of the address inputs.

9. Apparatus for controlling a signal device for energization by an electrical source comprising:

means for repeatedly producing digital cycles on an output line wherein each digital cycle includes a sequence of alternating pulses an spaces, each cycle having at lest two pulses that differ in duration with respect to each other and having at least two spaces that differ in duration with respect to each other;

means connected to the output line and responsive to said means for producing the digital cycles for applying electrical energization from the electrical source to the signal device in accordance with the pulses in the digital cycles and for not applying electrical energization from the electrical source to the signal device in accordance with the spaces in the digital cycles; and

wherein said means for producing digital cycles includes an oscillator having an alterable repetition rate, and means responsive to the oscillator for concurrently generating a control signal for selectively altering the repetition rate of the oscillator at least once during each digital cycle.

10. Apparatus for controlling a signal device for energization by an electrical source comprising:

means for repeatedly producing digital cycles on an output line wherein each digital cycle includes a sequence of alternating pulses and spaces, each cycle having at least two differing subperiods, each subperiod including a pulse and a space and every subperiod exceeding one-tenth second; and

means connected to the output line and responsive to said means for producing digital cycles for applying electrical energization from the electrical source to the signal device in accordance with the pulses i the digital cycles; and

wherein said means for producing digital cycles includes an oscillator having an alterable repetition rate and means responsive to the oscillator for concurrently generating a control signal for selectively altering the repetition rate of the oscillator at least once during each digital cycle.

11. Apparatus for controlling electrical energization of a signal device by an electrical source, the circuit comprising:

sequencing means for producing a sequential electrical output, said sequencing means including a counter including an oscillator having an alterable repetition rate establishing a rate of counting by the counter;

memory means responsive to the sequential electrical output from said sequencing means for generating a pattern of signals having pulses or spaces of different duration, said memory means including means for concurrently generating a control signal for selectively altering the repetition rate of the oscillator at least once as the pattern is produced;

mode select means connected to said memory means for selecting one of a plurality of patterns to be generated; and

means connected to the memory means for repeatedly energizing the signal device from the electrical source in accordance with the pattern of signals.

12. Apparatus as set forth in claim 11 wherein said memory means includes means for concurrently generating a control signal for resetting the sequencing means, whereby the pattern of signals is repeated.

13. Apparatus as set forth in claim 11 wherein said memory means also includes means for concurrently generating a control signal for resetting the sequencing means, whereby the pattern of signals is repeated.

14. Apparatus as set forth in claim 11 wherein the pattern of signals comprises a cycle with on periods of differing lengths.

15. Apparatus as set forth in claim 11 wherein the pattern of signals comprises a cycle with off periods of unequal lengths.