System for controlling raised-voltage defrosting of an electric windshield in a motor vehicle
First Claim
1. A system for controlling raised-voltage defrosting of an electric windshield in a motor vehicle, the system including an air-conditioning computer and a battery-charging alternator, excitation of the inductor of said alternator being controlled via an excitation regulator, wherein the system includes:
- a control member connected to said air-conditioning computer, said control member receiving a signal for triggering the defrosting of the windshield from said air-conditioning computer, and transmitting a plurality of state monitoring signals to said air-conditioning computer, said control member being constituted by a logic unit delivering a plurality of sequential control signals;
switch-over means connected to the rectified output from the alternator and serving to connect said rectified output from the alternator, either to the battery for delivering electrical energy at the nominal voltage of the vehicle battery, or else to the windshield for feeding the electric windshield, said plurality of sequential control signals including at least;
a signal for controlling de-excitation of the inductor of the alternator, said signal being delivered to said excitation regulator; and
a switch-over control signal for controlling said switch-over means, with raised-voltage regulation being inhibited when the battery is connected to the rectified output of the alternator and being enabled when the windshield is connected to the rectified output of the alternator.
1 Assignment
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Accused Products
Abstract
A control member is connected to an air-conditioning computer and it receives therefrom a signal for triggering defrosting of the windshield. Switch-over means are connected to the rectified output of the alternator and connect the output either to the network for distributing electrical energy at the nominal voltage of the vehicle battery, or else to a network for feeding the electric windshield. The control member is constituted by a logic unit delivering a plurality of sequential control signals. These signals include at least one signal for controlling de-excitation of the inductor of the alternator, which signal is delivered to the excitation regulator, and a switchover control signal for controlling the switchover means. Raised-voltage regulation is inhibited so long as the battery is connected to the rectified output of the alternator and it is enabled when the windshield is connected to the rectified ouptut of the alternator. The invention is applicable to power supply circuits in motor vehicles, including heavy goods vehicles, utility vehicles, and private cars.
22 Citations
13 Claims
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1. A system for controlling raised-voltage defrosting of an electric windshield in a motor vehicle, the system including an air-conditioning computer and a battery-charging alternator, excitation of the inductor of said alternator being controlled via an excitation regulator, wherein the system includes:
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a control member connected to said air-conditioning computer, said control member receiving a signal for triggering the defrosting of the windshield from said air-conditioning computer, and transmitting a plurality of state monitoring signals to said air-conditioning computer, said control member being constituted by a logic unit delivering a plurality of sequential control signals; switch-over means connected to the rectified output from the alternator and serving to connect said rectified output from the alternator, either to the battery for delivering electrical energy at the nominal voltage of the vehicle battery, or else to the windshield for feeding the electric windshield, said plurality of sequential control signals including at least; a signal for controlling de-excitation of the inductor of the alternator, said signal being delivered to said excitation regulator; and a switch-over control signal for controlling said switch-over means, with raised-voltage regulation being inhibited when the battery is connected to the rectified output of the alternator and being enabled when the windshield is connected to the rectified output of the alternator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification