Patent ID: 7574987
Filing Date: 2009-08-18
Classification: F01P,F02N

Abstract:
1. A device intended for heating the coolant of a motor driven vehicle in order to heat the vehicle before a cold start, the device comprising: a connection arrangement arranged to allow electrical connection of the device to a current source; a heat-generating element comprising an electrical conductor designed to generate heat when a current flows through the conductor, which heat-generating element is designed to be in contact with and transfer the generated heat to the coolant; and a thermostat arranged to interrupt the current through the device when the thermostat senses a temperature exceeding a first limit temperature at a voltage below the voltage of the motor vehicle, thereby interrupting the current through the electrical conductor before the electrical conductor is destroyed, wherein the electrical conductor is destroyed at the first temperature limit at the voltage of the motor vehicle if the heat transfer from the heat-generating element is substantially decreased during a period of time, thereby interrupting the current through the electrical conductor before the thermostat interrupts the current through the conductor.