Device for the metered supplying of fuel vapor into the intake pipe of a combustion engine
First Claim
1. Device for the temporary storage and metered supply of fuel vapor from a fuel tank system to a combustion engine, said fuel tank system comprising a fuel tank having a free space therein, a deaeration pipe connecting said free space to the surrounding atmosphere, and a storage chamber having an absorptive element incorporated in said deaeration pipe, said device being located between said storage chamber and said engine and comprisingan electromagnetic stop valve,a control chamber disposed serially between said stop valve and said engine,an auxiliary valve disposed in said control chamber to change the metering capacity of the stop valve,a bypass provided parallel to said auxiliary valve, said bypass having an adjustable cross-section, andvacuum control means for controlling the position of the auxiliary valve, said vacuum control means being responsive to the differential pressure between the control chamber and the atmosphere.
1 Assignment
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Accused Products
Abstract
A device for the temporary storing and metered supplying of volatile fuel components present in the free space 22 of a fuel tank system 15 into the intake pipe 1 of a combustion engine 2. The device includes a deaeration pipe 25 which connects the free space 22 with the atmosphere 23 and in which a storage chamber 18 including an absorptive element is disposed. A pipe 20 connects the storage chamber 18 with the intake pipe and can be closed by means of an electromagnetic stop valve 13. An auxiliary valve 21 including a control chamber 14 which can be closed by means of a vacuum controller is disposed between the stop valve 13 and the intake pipe 1. A bypass 4 having an adjustable cross section is provided parallel to the auxiliary valve 21.
46 Citations
12 Claims
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1. Device for the temporary storage and metered supply of fuel vapor from a fuel tank system to a combustion engine, said fuel tank system comprising a fuel tank having a free space therein, a deaeration pipe connecting said free space to the surrounding atmosphere, and a storage chamber having an absorptive element incorporated in said deaeration pipe, said device being located between said storage chamber and said engine and comprising
an electromagnetic stop valve, a control chamber disposed serially between said stop valve and said engine, an auxiliary valve disposed in said control chamber to change the metering capacity of the stop valve, a bypass provided parallel to said auxiliary valve, said bypass having an adjustable cross-section, and vacuum control means for controlling the position of the auxiliary valve, said vacuum control means being responsive to the differential pressure between the control chamber and the atmosphere.
Specification