Power supply control apparatus
AssigneesAutonetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
InventorsRyohei Sawada, Kota Oda, Ken Furuto, Masayuki Kato
Life of this patent
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Abstract
A heater drive apparatus functions as a power supply control apparatus, and controls power supply to an electrical heating wire. In the heater drive apparatus, a current output circuit and a detection resistor function as a current detection unit, and detect a current flowing through the electrical heating wire. A microcomputer repeatedly calculates an electrical heating wire temperature relating to the electrical heating wire based on the detected current. A drive circuit functions as a switching unit, and switches a switch on or off in accordance with the calculated electrical heating wire temperature.
Claims9
A power supply control apparatus for controlling power supply to an electrical heating wire, the apparatus comprising:
- a current detection unit configured to detect a current flowing through the electrical heating wire;
- a switch that is disposed on a path of the current that flows through the electrical heating wire;
- wherein the electrical heating wire is disposed in the seat;
- a control unit configured to execute processing;
- and
- a switching unit configured to switch the switch on or off,
- wherein the control unit executes processing for repeatedly calculating an electrical heating wire temperature relating to the electrical heating wire based on the current detected by the current detection unit, and the control unit is further configured to obtain seating information indicating whether or not a person is seated on a seat of a vehicle, and wherein the control unit executes processing for changing a value of a variable that is used in a formula for calculating the electrical heating wire temperature, in accordance with the obtained seating information, and
- the switching unit switches the switch on or off in accordance with the electrical heating wire temperature calculated by the control unit.
Dependencies are inferred from the claim text.