Alarm system for a motor vehicle
First Claim
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1. Alarm system for a motor vehicle, comprisingan alarm control unit connected to and powered by a main battery of the motor vehicle;
- a siren unit connected to and powered by the main battery,a back-up battery connected to and operable to power both the alarm control unit and the siren unit upon failure of the power supply from the main battery,the siren unit being adapted to detect a power offtake from the back-up battery and the siren unit being operable to deliver an alarm if the detected power offtake exceeds a predetermined level.
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Abstract
Alarm system for motor vehicle, incorporating an alarm control unit which is powered by a main battery of the motor vehicle, a siren unit likewise powered by the main battery, and a back-up battery in the siren unit which is arranged to power the siren unit upon failure of the power supply from the main battery. To simplify and make such an alarm safer, it is proposed inter alia that upon said failure of power supply from the main battery the back-up battery be arranged to automatically power also the alarm control unit.
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Citations
7 Claims
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1. Alarm system for a motor vehicle, comprising
an alarm control unit connected to and powered by a main battery of the motor vehicle; -
a siren unit connected to and powered by the main battery, a back-up battery connected to and operable to power both the alarm control unit and the siren unit upon failure of the power supply from the main battery, the siren unit being adapted to detect a power offtake from the back-up battery and the siren unit being operable to deliver an alarm if the detected power offtake exceeds a predetermined level. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification