Fluid level and temperature monitor and alarm system
First Claim
1. A system for measuring characteristics of an internal combustion engine having an engine head, a radiator, and a first radiator hose and a second radiator hose transferring a coolant between said radiator and said internal combustion engine, comprising:
- a heat sensor mounted in said engine head;
a second heat sensor mounted to sense temperature of coolant in said second radiator hose, said second heat sensor being electrically connected with said heat sensor in said engine head;
a heat control circuit responsive to said heat sensor and said second heat sensor producing a warning signal when said heat sensor and said second heat sensor measure a selected temperature, said heat control circuit being adjustable to set said selected temperature at a selected value above a hottest normal operating temperature level of said engine head, andat least one alarm responsive to said warning signal and being activated to provide an audible and/or visual alarm when said selected temperature is reached.
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Accused Products
Abstract
An electronic detection system monitoring coolant level and/or temperature of an internal combustion engine. A unit installed within the cab of a vehicle provides visual and audible warning if engine temperature rises above its normal hottest operating temperature and/or when coolant level drops below a selected level in the coolant reserve tank thereby preventing damage caused by overheating. The overheat detection system may comprise a heat sensor within a bolt which may be screwed directly into the engine head. An additional heat sensor positioned in the bottom radiator hose can be used in series with the engine head sensor. Associated circuitry is adjustable when installed to provide alarm activation when the temperature is a few degrees above the hottest normal engine operating temperature. If the engine starts to overheat, an LED lights up and an audible alarm sounds. A coolant level detector detects a drop in coolant level and comprises two probes installed horizontally in a side wall of the coolant reserve tank to provide a current path through the coolant present between the probes. Circuitry includes an appropriate timing means connected to the probes, and an LED indicator and/or audible alarm to warn the driver when the coolant level drops below a predetermined level. Additional coolant probes may be installed in the top radiator hose to warn the driver in the event of complete loss of coolant.
32 Citations
20 Claims
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1. A system for measuring characteristics of an internal combustion engine having an engine head, a radiator, and a first radiator hose and a second radiator hose transferring a coolant between said radiator and said internal combustion engine, comprising:
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a heat sensor mounted in said engine head; a second heat sensor mounted to sense temperature of coolant in said second radiator hose, said second heat sensor being electrically connected with said heat sensor in said engine head; a heat control circuit responsive to said heat sensor and said second heat sensor producing a warning signal when said heat sensor and said second heat sensor measure a selected temperature, said heat control circuit being adjustable to set said selected temperature at a selected value above a hottest normal operating temperature level of said engine head, and at least one alarm responsive to said warning signal and being activated to provide an audible and/or visual alarm when said selected temperature is reached. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for measuring characteristics of an internal combustion engine having a radiator and a radiator hose connected therebetween, said engine further including a coolant reserve tank, said coolant reserve tank being connected to said radiator and configured to transfer coolant between said coolant reserve tank and said radiator, said system further including:
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at least one coolant level sensor mounted to sense level of coolant in said coolant reserve tank; a coolant level circuit, said at least one coolant level sensor being connected to said coolant level circuit which senses a first current through said at least one coolant level sensor when said level of said coolant in said coolant reserve tank is at or above a selected coolant level, said coolant level circuit sensing a second current through said at least one coolant level sensor when said coolant in said coolant reserve tank is below said selected coolant level, said first current being higher than said second current, said coolant level circuit connected to at least one alarm and responsive to said at least one coolant level sensor to activate said at least one alarm when coolant level in said coolant reserve tank is below said selected coolant level; further including timer circuitry in said coolant level circuit connected to transistor circuitry configured to prevent said timer circuitry from activating said at least one alarm so long as coolant level is above said selected coolant level; wherein said timer circuitry turns said transistor circuitry on and off at a selected rate such that said transistor circuitry is turned on during a time period that is longer than a time period during which the transistor circuitry is turned off. - View Dependent Claims (20)
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Specification