Abstract A plurality of pressure-activated electric switches are connected to pressures which are variable with an engine''s speed of rotation or to comparatively constant fuel pressure, respectively; and an engine speed-of-rotation activated electric switch is connected to said engine which has an associated electrical power supply for use with said switches. Said power supply is connected through one of the constant-fuel-pressureactivated switches and a voltage regulator to electrical input terminals of the remainder of said switches in parallel circuits. These switches are activated in various combinations in accordance with the fuel-pressure/rpm/oil-pressure conditions which exist. A first logic circuit activates an alarm when the switch combination indicates a malfunction in the engine oil pressure. A second logic circuit is connected in parallel with said first logic circuit and is adapted to conduct only when impossible fuel-pressure/rpm/oil-pressure conditions are indicated which indicates malfunctions of said switches. An alarm is energized when said second logic circuit conducts.
In combination with an engine having a variable-pressure oil system and an electrical power supply, a warning device comprising: a. Engine-running sensing means connected to the engine and electrical power supply and responsive thereto for sensing if said engine is running and to provide an electrical output in accordance therewith; b. Variable-pressure sensing means connected to said engine and electrical power supply and responsive thereto for sensing variations of pressure in said variable-pressure oil system and to provide and electrical output in accordance therewith; c. Speed sensing means connected to said engine and electrical power supply and responsive thereto for sensing rpm of said engine and to provide an electrical output in accordance therewith; d. First logic circuit means connected to the respective electrical outputs of said engine - running sensing means, pressure and speed sensing means for comparison and responsive thereto produce an electrical output indicative of engine malfunctioning; e. Second logic circuit means connected to the respective electrical outputs of said engine - running sensing means, pressure and speed sensing means, and in parallel circuit with said first logic circuit means, for comparison and responsive thereto provide an electrical output indicative of said sensing means malfunctioning; f. And warning indicator means connected to respective electrical outputs of said first and second logic circuit means for energization thereby to warn of malfunctioning.
Claim 2
Dependent Claim
223 words
In combination with an engine having a variable-pressure oil system and an electrical power supply, a warning device comprising: a. Engine-running sensing means connected to the engine and electrical power supply and responsive thereto for sensing if said engine is running and to provide an electrical output in accordance therewith; b. Variable-pressure sensing means connected to said engine and electrical power supply and responsive thereto for sensing variations of pressure in said variable-pressure oil system and to provide and electrical output in accordance therewith; c. Speed sensing means connected to said engine and electrical power supply and responsive thereto for sensing rpm of said engine and to provide an electrical output in accordance therewith; d. First logic circuit means connected to the respective electrical outputs of said engine - running sensing means, pressure and speed sensing means for comparison and responsive thereto produce an electrical output indicative of engine malfunctioning; e. Second logic circuit means connected to the respective electrical outputs of said engine - running sensing means, pressure and speed sensing means, and in parallel circuit with said first logic circuit means, for comparison and responsive thereto provide an electrical output indicative of said sensing means malfunctioning; f. And warning indicator means connected to respective electrical outputs of said first and second logic circuit means for energization thereby to warn of malfunctioning.
Claim 3
Dependent Claim
48 words
A warning device as described in claim 1 wherein said engine-running sensing means comprises: constant pressure activated switches connected to the fuel line of said engine and adopted to be sWitched to on position by the pressure in said fuel lines, and to ''''off'''' position by no pressure.