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US 4,927,077 AGranted
Heater device for motor vehicle
AssigneeIsuzu Motors Limited
InventorMasaki Okada
Life of this patent
Estimating the term…
Abstract
A heater device for a motor vehicle detects the temperatures of a burner and a heat exchanger when the heater device is shut off. When the detected temperatures reach respective preset values, a combusting blower for supplying combusting air to the burner and a heating blower for supplying heating air to the heat exchanger are actuated to introduce cooling air to the burner and the heat exchanger for thereby preventing the burner and the heat exchanger from being overheated.
Claims7
(THREE TIMES AMENDED) A heater apparatus for a motor vehicle, comprising:
- a burner for combusting fuel and producing hot combustion gas;
- a heat exchanger connected to the burner and being operable to transfer heat between the combustion gas from the burner and heating air to be introduced into a passenger compartment of the motor vehicle;
- means for detecting when the burner ceases operation and outputting a signal indicative of a ceased operation condition;
- temperature detecting means connected to the heater apparatus for detecting the temperature of the heater apparatus and outputting a signal indicative of an over heat condition;
- blower means in fluid communication with the heater apparatus;
- and
- means operable in response to the over heat condition signal and the ceased operation condition signal for actuating the blower means to introduce air into the heater apparatus, thereby lowering the temperature of the heater apparatus.
4 more elements
Dependencies are inferred from the claim text.