摘要:
A marine fouling inhibiting system comprises first and second conductors which are made of a polymer matrix, such as vinyl ester, and a suspended conductor, such as graphite powder or particles. This type of conductive material is formed to provide two sections of a boat hull so that a source of electrical current can be used to reversibly cause an electric current to flow to and from the conductive coatings. The conductive coatings are electrically insulated from each other in order to force the formation of an electrical circuit which includes the two conductive coatings, the source of electrical current, and the water in which the boat hull is disposed. This results in the creation of chlorine bubbles on the conductive surfaces. Chlorine bubbles on the boat hull surfaces discourage the formation of marine growth, such as barnacles.
摘要:
A multilayered submersible structure has an outer coating that is disposed in contact with water in which the structure is submerged, a current distribution layer or charge distribution layer, an electrical conductor connectable in electrical communication to a source of electrical power, and a support structure. By selectively energizing the current distribution layer, or charge distribution layer, chemical and ionic changes can be caused in the water immediately adjacent the outer coating or layer to inhibit the growth of marine organisms on the outer surface of the submersible structure.
摘要:
A method for operating a system which inhibits the growth of marine organisms on a submerged surface causes a current to flow to one of two submerged surfaces over a time period that is selected as a function of the magnitude of the current and the area of the surface. In other words, the time period is determined as a function of the current density applied to the surface. In a particularly preferred embodiment the current density is maintained at approximately 35 milliamps per square foot and the time period is approximately four minutes. At the end of the time period, the current is reversed and a second submerged surface is polarized in a similar manner.
摘要:
A marine drive cathodic protection control circuit and method controls ohmic current from a power source to an anode according to electrical reference potential sensed by a reference electrode. The ohmic current is interrupted for an interruption interval, and reference potential is sensed during the interruption interval. The ohmic current is controlled according to reference potential sensed during the interruption interval.
摘要:
Two sensor units are mounted on opposite sides of a transom of a boat and directed to a common location behind the boat. The field of view of the two sensors overlaps behind the marine propulsion unit of the boat to detect the presence of a heat emitting object, such as a mammal. Housing structures contain infrared sensing elements, lenses, and light shields. Signals from four infrared sensing elements are received by a controller which reacts, with an alarm signal, when at least two of the four sensors detect a heat emitting object within their individual fields of view. False triggering can be reduced by not providing an alarm signal if only the two most inboard sensors detect the heat emitting object.
摘要:
A monitoring system detects the presence or absence of a marine vessel operator within a defined zone near the helm of a marine vessel. The detection is accomplished through the use of a provision of an e-field and the detection of e-field strength by a receiving antenna system. When the operator is in the proper helm position, the e-field strength is diminished by the presence of a portion of the operator's body within the e-field zone.
摘要:
A safety for a marine vessel provides an infrared sensor with a tube having a central cavity in order to define a viewing angle which is more narrow than the inherent viewing angle of the infrared sensor. The central cavity of the tube also defines a line of sight that can be directed toward a particular region near a marine vessel that is to be monitored for the presence of a heat generating object, such as a human being. An alarm circuit is responsive to signals from the infrared sensor and deactivates the marine propulsion system when a heat generating object is near the marine propulsion system. The length and diameter of the tube are selected to provide a desired viewing angle for the infrared sensor. An audible alarm output is provided if an attempt is made to manipulate a joystick that controls the marine propulsion system when a heat generating object is sensed by the infrared sensor.
摘要:
A galvanic isolator to protect against galvanic corrosion of a submersible metal marine drive. The galvanic isolator is positioned between shore ground and boat ground to prevent the flow of destructive galvanic currents between the shore ground and the boat ground, while maintaining the safety function of neutral ground. The galvanic isolator of the invention includes a blocking element positioned between the boat ground and the shore ground that can be switched between an open and a closed state by a trigger circuit. The trigger circuit closes the blocking element when the voltage difference between the boat ground and the shore ground exceeds a threshold value, such as 1.4 volts. During operation of the galvanic isolator during the high fault current situation, power is dissipated only by the blocking element, rather than by the combination of the blocking element and the trigger device. In this manner, the galvanic isolator reduces the amount of power dissipated during high current conditions and therefore reduces the amount of heat generated by the galvanic isolator.
摘要:
In a two cycle internal combustion engine (10), a reed block (52) has a fuel spray rail flow passage (72) integrally formed therein and supplying fuel atomized by combustion air flow therepast. The fuel spray rail passage extends longitudinally (78) along the apex (60) of a V-shaped reed block (52) at the downstream end thereof, and has discharge ports (74, 76) formed by openings through the sides (56, 58) of the V-shaped member, which ports (74, 76) are opened and closed by the downstream ends of the reed valve flaps (62, 64). When the reed valves are open, air flows across and parallel to the face of the discharge port opening and perpendicular to the direction of fuel flow out of such openings, for enhanced atomization of the fuel. When the reed valves are closed, the downstream ends of the reed valve flaps engage the reed block sides and cover and close the discharge ports such that fuel is blocked from draining into the crankcase.
摘要:
A positive starting system and circuit prevents false starting of a multicylinder two-cycle internal combustion engine (10). During initial cranking of the engine, starter kick-out is caused by ignition of a residual combustible charge in a cylinder, however the following cylinder does not have a combustible charge, and the engine ceasing running, thus requiring re-engagement of the starter to start the engine. The problem is solved by delaying ignition upon initial cranking until sufficient combustible charge is developed in the remaining cylinders. Upon initial cranking, ignition is disabled, and a timing delay interval is initiated. At the end of such interval, ignition is enabled.