Measuring and testing – Simulating operating condition – Marine
Patent
1982-09-21
1984-09-25
Goldberg, Gerald
Measuring and testing
Simulating operating condition
Marine
73204, G01F 168
Patent
active
044729650
ABSTRACT:
A method for preventing damage to a temperature-dependent resistor disposed in a flow cross-section caused by overheating as a result of the ignition of a combustible, gaseous mixture during a burnoff process and an air flow rate measuring device for performing the method are proposed. The air flow rate measuring device includes a temperature-dependent resistor disposed in a bypass line. Deposits on the surface of the temperature-dependent resistor are removed in a burnoff process, preferably following the opening of the ignition switch. The danger then exists that if the device is used in a motor vehicle, combustible fuel-air mixture located in the vicinity of the temperature-dependent resistor may ignite, and the temperature-dependent resistor would thereby be destroyed because of overheating. For this reason, a slide member is pushed into the flow cross-section during the burnoff process, so that only a small combustible volume is available in the vicinity of the temperature-dependent resistor.
REFERENCES:
patent: 3835820 (1974-09-01), Fujisawa
patent: 4373383 (1983-02-01), Plapp
Knapp Heinrich
Romann Peter
Thiel Franz-Josef
Goldberg Gerald
Greigg Edwin E.
Harding E. G.
Robert & Bosch GmbH
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