Device for and method of applying voltage to a heating resistor in a motor vehicle in dependency on operating conditions of the vehicle
First Claim
1. A device for applying voltage to a heating resistor in a motor vehicle having a power generator driven by the vehicle engine and a power supply network connected across terminals of a battery, comprising control means for delivering a heating control signal and signals corresponding to operational conditions of the motor vehicle inclusive ofstandstill, running and temperature conditions of the motor vehicle;
- first switching means responsive to the heating control signal to connect said power generator in parallel to one of said power supply network and one end of said heating resistor when heating is demanded; and
second switching means connected to the other end of said heating resistor and being responsive to one of said standstill and running condition signals, said second switching means connecting, when the parallel connection between the power generator and the power supply network is interrupted, said heating resistor parallel to said power generator in response to the standstill condition signal, and connecting said heating resistor in series with said power generator and said power supply network in response to the running condition signal.
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Accused Products
Abstract
Disclosed is a device for and a method of applying output voltage from a power generator to a heating resistor in a motor vehicle. During the standstill condition of the vehicle the heating resistor is connected directly to the generator and a power supply network connected parallel to the terminals of a battery, is disconnected from the generator. The output voltage of the generator is regulated to increased values to achieve a higher efficiency in the heating resistor. During the travel of the motor vehicle, the heating resistor is connected in series with the power supply network and a regulated voltage from the power generator is applied across the series connection. The output voltage is regulated such that a nominal voltage is maintained at the power supply network. The switchover between the standstill and running operational conditions is provided by two switching devices which are controlled by a control device in dependency on operational conditions of the motor vehicle.
33 Citations
9 Claims
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1. A device for applying voltage to a heating resistor in a motor vehicle having a power generator driven by the vehicle engine and a power supply network connected across terminals of a battery, comprising control means for delivering a heating control signal and signals corresponding to operational conditions of the motor vehicle inclusive of
standstill, running and temperature conditions of the motor vehicle; - first switching means responsive to the heating control signal to connect said power generator in parallel to one of said power supply network and one end of said heating resistor when heating is demanded; and
second switching means connected to the other end of said heating resistor and being responsive to one of said standstill and running condition signals, said second switching means connecting, when the parallel connection between the power generator and the power supply network is interrupted, said heating resistor parallel to said power generator in response to the standstill condition signal, and connecting said heating resistor in series with said power generator and said power supply network in response to the running condition signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- first switching means responsive to the heating control signal to connect said power generator in parallel to one of said power supply network and one end of said heating resistor when heating is demanded; and
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9. A method of supplying voltage to a heating resistor in a motor vehicle having a regulated power generator driven by the vehicle engine and being normally connected parallel to a power supply network connected across terminals of a battery, comprising the steps of generating signals corresponding to different operational conditions of the motor vehicle, inclusive of a standstill a running condition;
- applying output voltage from said generator across the heating resistor while interrupting connection between said power supply network and said generator when heating is demanded;
regulating said output voltage to exceed a nominal voltage of said power supply network when the standstill condition signal is generated; and
if the running condition signal is generated, applying a regulated voltage from said generator across a series connection of said heating resistor and said power supply network; and
said regulated voltage maintaining a constant voltage across said battery terminals corresponding to a nominal voltage of the power supply network.
- applying output voltage from said generator across the heating resistor while interrupting connection between said power supply network and said generator when heating is demanded;
Specification