| 摘要 |
An air intake shut down device which utilizes variations in the ratio of air pressure and vacuum during load and no load conditions in different locations of a turbo charged engine air intake to influence movement of a pair of diaphragms which are linked to trip a butterfly valve mounted within a diesel engine air intake system. The butterfly valve is mounted between the engine air filter and turbo charger. One diaphragm moves to trip the butterfly valve when exposed to increased vacuum between the turbo charged and engine air filter during no load high engine speeds. The other regulating diaphragm moves to resist tripping the butterfly valve when exposed to increased air pressure between the turbo charger and the engine during load high engine speeds. During no load high engine speeds, vacuum influence on the first diaphragm is increased and counteractive air pressure on the regulating diaphragm is decreased resulting in the a net overall movement which trips the butterfly valve to close. Engine oil pressure and coolant temperature are monitored by sensors which supply truck air pressure to one diaphragm to trip the shut off valve during detrimental conditions. The over speed control component of the system may be deactivated while maintaining the oil and coolant monitoring controls.
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