Apparatus for detecting and displaying engine speed
First Claim
1. Apparatus for detecting and displaying the revolution speed of an internal combustion engine having an electrical distribution system including at least one spark cable, said apparatus comprising, in combination:
- a hand held housing having a digital display;
an antenna connected to said housing and projecting therefrom, said antenna for placement adjacent to a spark cable of an internal combustion engine for receiving electromagnetic energy pulses radiating from said spark cable; and
pulse to direct digital counter interphase circuit means disposed in said housing in operative association with said antenna and with said digital display to count the electrical energy pulses received by said antenna from said spark cable within a predetermined time frame to determine electrical pulse frequency and to directly convert the determined electrical pulse frequency into internal combustion engine revolution speed and to display said internal combustion engine revolution speed on said digital display, said pulse to direct digital counter interphase circuit means including incoming signal shaper means and a phase locked loop in operative association with said incoming signal shaper means for multiplying the pulse frequency of said incoming signal, and said pulse to direct digital counter interphase circuit means including switch means operatively associated with said phase locked loop to vary the multiplication factor for multiplying the pulse frequency of said incoming signal.
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Accused Products
Abstract
Apparatus for detecting and displaying the revolution speed of an internal combustion engine having an electrical distribution system including at least one spark plug includes a hand held housing having a digital display. An antenna is connected to the housing which is for placement adjacent to the spark cable. A pulse to direct digital interphase circuit is in the housing and counts the electrical energy pulses received by the antenna from the spark cable within a predetermined time frame to determine electrical pulse frequency and to convert the determined electrical pulse frequency into internal combustion engine revolution speed and to display the internal combustion engine revolution speed on the digital display.
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Citations
15 Claims
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1. Apparatus for detecting and displaying the revolution speed of an internal combustion engine having an electrical distribution system including at least one spark cable, said apparatus comprising, in combination:
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a hand held housing having a digital display; an antenna connected to said housing and projecting therefrom, said antenna for placement adjacent to a spark cable of an internal combustion engine for receiving electromagnetic energy pulses radiating from said spark cable; and pulse to direct digital counter interphase circuit means disposed in said housing in operative association with said antenna and with said digital display to count the electrical energy pulses received by said antenna from said spark cable within a predetermined time frame to determine electrical pulse frequency and to directly convert the determined electrical pulse frequency into internal combustion engine revolution speed and to display said internal combustion engine revolution speed on said digital display, said pulse to direct digital counter interphase circuit means including incoming signal shaper means and a phase locked loop in operative association with said incoming signal shaper means for multiplying the pulse frequency of said incoming signal, and said pulse to direct digital counter interphase circuit means including switch means operatively associated with said phase locked loop to vary the multiplication factor for multiplying the pulse frequency of said incoming signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for detecting and displaying the revolution speed of an internal combustion engine having an electrical distribution system including at least one spark cable, said apparatus comprising, in combination:
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a hand held housing having a digital display; an antenna connected to said housing and projecting therefrom, said antenna for placement adjacent to a spark cable of an internal combustion engine for receiving electromagnetic energy pulses radiating from said spark cable; and pulse to direct digital counter interphase circuit means disposed in said housing in operative association with said antenna and with said digital display to count the electrical energy pulses received by said antenna from said spark cable within a predetermined time frame to determine electrical pulse frequency and to directly convert the determined electrical pulse frequency into internal combustion engine revolution speed and to display said internal combustion engine revolution speed on said digital display, said antenna comprising an elongated, flexible shielded cable having a center wire with a distal end, said flexible shielded cable being stripped of shielding at said center wire distal end. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification