Multiple sensor heat alarm
DCFirst Claim
1. In a system for signaling a higher than preset interior temperature of a vehicle having a battery including temperature sensors in the vehicle and a control head which activates an alarm when a preset temperature is exceeded, said alarm including activation of one or more of a group of vehicle components consisting of the horn, siren, emergency lights, or headlights, the improvement comprising said control head having a microprocessor connected to said at least two temperature sensors, said temperature sensors widely dispersed in the passenger areas of said vehicle, each of said temperature sensors sending local temperature data to said microprocessor, said microprocessor including algorithms operable to:
- compute an average of said temperature data from said at least two temperature sensors, compare said average with said preset temperature and activate said alarm when said average exceeds said preset temperaturecontinuously monitor the vehicle battery voltage to determine if a negative rate of change in vehicle battery voltage exists and activating said alarm if said rate exceeds a preset limit, andmonitoring each sensor to detect failure in operation, and activating said alarm in the event of sensor failure.
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Abstract
A multiple heat sensor alarm system for use in a vehicle to indicate that the interior temperature is above a preset limit has a control head with a microprocessor. Heat sensors or thermometers are placed at different points in the vehicle and connected to the microprocessor. The processor averages all sensor inputs and compares the average to the preset alarm temperature limit. When the limit is exceeded the microprocessor issues an alarm command. The system is connected to the vehicle components and the alarm command operates the horn, lights, windows, doors, or engine. The system may correspond with a portable beeper/pager. The microprocessor has a time delay mode on initial start-up. The system also monitors the battery power of the vehicle and indicates a low power situation.
65 Citations
21 Claims
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1. In a system for signaling a higher than preset interior temperature of a vehicle having a battery including temperature sensors in the vehicle and a control head which activates an alarm when a preset temperature is exceeded, said alarm including activation of one or more of a group of vehicle components consisting of the horn, siren, emergency lights, or headlights, the improvement comprising said control head having a microprocessor connected to said at least two temperature sensors, said temperature sensors widely dispersed in the passenger areas of said vehicle, each of said temperature sensors sending local temperature data to said microprocessor, said microprocessor including algorithms operable to:
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compute an average of said temperature data from said at least two temperature sensors, compare said average with said preset temperature and activate said alarm when said average exceeds said preset temperature continuously monitor the vehicle battery voltage to determine if a negative rate of change in vehicle battery voltage exists and activating said alarm if said rate exceeds a preset limit, and monitoring each sensor to detect failure in operation, and activating said alarm in the event of sensor failure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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- 12. An alarm system for installation in a passenger compartment of a vehicle to indicate the existence of an unhealthy temperature, said system comprising at least two temperature sensors, said at least two sensors adapted to be placed in the vehicle in a widely dispersed arrangement inside the passenger compartment and a microprocessor connected to said at least two sensors, said microprocessor programmed with a temperature alarm threshold, said microprocessor programmed to compute an average of said temperature data from said at least two temperature sensors, compare said average with said temperature alarm threshold and issue an alarm command adapted to energize vehicle components to emit visual and aural signals when said alarm threshold is exceeded, said microprocessor having a programmed time delay mode, said programmed time delay mode preventing an immediate command upon initial activation of the system when the vehicle temperature exceeds said alarm threshold.
- 18. An alarm system for installation in a passenger compartment of a vehicle to indicate the existence of an unhealthy temperature, said system comprising at least two temperature sensors, said at least two temperatures sensors adapted to be placed in the vehicle in a widely dispersed arrangement inside the passenger compartment, and a microprocessor, connected to said at least two temperature sensors, said microprocessor programmed to compute an average of said temperature data from said at least two temperature sensors and compare said average with a temperature alarm threshold, said microprocessor programmed to issue an alarm command adapted to energize vehicle components to emit visual and aural signals when said average exceeds said temperature alarm threshold, said microprocessor programmed with a battery sentinel mode, said battery sentinel mode adapted to monitor the vehicle battery voltage over time to determine rate of voltage drop, said mode initiating a sequence when said voltage drop exceeds a preset limit, said microprocessor in said battery sentinel mode issues an alarm command of short duration, said sentinel mode includes a rest period to conserve battery power, said microprocessor in said battery sentinel mode repeats said alarm command of short duration, said battery sentinel mode repeats this sequence until power is restored.
Specification