An internal combustion engine system includes a reciprocating compressor for pressurizing a fluid medium and having a compressor cylinder for accommodating a compressor piston. The compressor cylinder has a main cylinder volume and a secondary adjustable volume in fluid communication with the main cylinder volume so as to provide a variable geometrical compression ratio.

An internal combustion engine system includes a reciprocating compressor for pressurizing a fluid medium and having a compressor cylinder for accommodating a compressor piston. The compressor cylinder has a main cylinder volume and a secondary adjustable volume in fluid communication with the main cylinder volume so as to provide a variable geometrical compression ratio.

An internal combustion engine system includes a reciprocating compressor for pressurizing a fluid medium and having a compressor cylinder for accommodating a compressor piston. The compressor cylinder has a main cylinder volume and a secondary adjustable volume in fluid communication with the main cylinder volume so as to provide a variable geometrical compression ratio.

The disclosure provides a method and an apparatus for acquiring an electronic file. The method for acquiring an electronic file comprises: sending a first request message for acquiring an electronic file to a platform server, wherein the first request message carries a first identifier of an information providing server providing the electronic file; receiving first prompt information returned from the platform server according to the first request message; determining first verification information for identity authentication according to the first prompt information, and sending the first verification information to the platform server; and receiving the electronic file forwarded by the platform server, wherein the electronic file is from the information providing server, and private information in the electronic file is encrypted through a first encryption key of the information providing server. The technical solutions in the disclosed embodiments can effectively protect private information of a user from being leaked by a platform server, thereby ensuring privacy security of the user.

The disclosure provides a method and an apparatus for acquiring an electronic file. The method for acquiring an electronic file comprises: sending a first request message for acquiring an electronic file to a platform server, wherein the first request message carries a first identifier of an information providing server providing the electronic file; receiving first prompt information returned from the platform server according to the first request message; determining first verification information for identity authentication according to the first prompt information, and sending the first verification information to the platform server; and receiving the electronic file forwarded by the platform server, wherein the electronic file is from the information providing server, and private information in the electronic file is encrypted through a first encryption key of the information providing server. The technical solutions in the disclosed embodiments can effectively protect private information of a user from being leaked by a platform server, thereby ensuring privacy security of the user.

The disclosure provides a method and an apparatus for acquiring an electronic file. The method for acquiring an electronic file comprises: sending a first request message for acquiring an electronic file to a platform server, wherein the first request message carries a first identifier of an information providing server providing the electronic file; receiving first prompt information returned from the platform server according to the first request message; determining first verification information for identity authentication according to the first prompt information, and sending the first verification information to the platform server; and receiving the electronic file forwarded by the platform server, wherein the electronic file is from the information providing server, and private information in the electronic file is encrypted through a first encryption key of the information providing server. The technical solutions in the disclosed embodiments can effectively protect private information of a user from being leaked by a platform server, thereby ensuring privacy security of the user.

The disclosure provides a method and an apparatus for acquiring an electronic file. The method for acquiring an electronic file comprises: sending a first request message for acquiring an electronic file to a platform server, wherein the first request message carries a first identifier of an information providing server providing the electronic file; receiving first prompt information returned from the platform server according to the first request message; determining first verification information for identity authentication according to the first prompt information, and sending the first verification information to the platform server; and receiving the electronic file forwarded by the platform server, wherein the electronic file is from the information providing server, and private information in the electronic file is encrypted through a first encryption key of the information providing server. The technical solutions in the disclosed embodiments can effectively protect private information of a user from being leaked by a platform server, thereby ensuring privacy security of the user.

The present invention has: a crank angle sensor 4 that outputs a crank angle signal in response to rotation of a crankshaft 2, the crank angle signal being preset to indicate reference positions; a cam sensor 5 that outputs cam signal pulses in response to rotation of an intake camshaft 3 for opening and closing an engine valve; an electric motor 6 that relatively rotates intake camshaft 3 with respect to crankshaft 2, so that electric motor 6 can change a rotational phase angle of intake camshaft 3 with respect to crankshaft 2; and an electronic control unit 7 that computes an actual rotational phase angle of intake camshaft 3 based on a first cam signal pulse detected after start of cranking and a first reference position of the crank signal detected thereafter, to calculate an absolute position of a variable valve timing mechanism 14.

The present invention has: a crank angle sensor 4 that outputs a crank angle signal in response to rotation of a crankshaft 2, the crank angle signal being preset to indicate reference positions; a cam sensor 5 that outputs cam signal pulses in response to rotation of an intake camshaft 3 for opening and closing an engine valve; an electric motor 6 that relatively rotates intake camshaft 3 with respect to crankshaft 2, so that electric motor 6 can change a rotational phase angle of intake camshaft 3 with respect to crankshaft 2; and an electronic control unit 7 that computes an actual rotational phase angle of intake camshaft 3 based on a first cam signal pulse detected after start of cranking and a first reference position of the crank signal detected thereafter, to calculate an absolute position of a variable valve timing mechanism 14.

A system for assembling components of an internal combustion engine assembly includes a wireless tag attached to each of a plurality of components of the engine assembly, each wireless tag attached to a respective component of the plurality of components and configured to be read to acquire guidance information related to manufacture of the engine assembly. The guidance information provides at least one of weight information and matching information, the matching information indicating a matching component that is configured to be connected to the respective component. The system also includes a processing device configured to perform: acquiring the guidance information for the respective component by reading the wireless tag, and tracking the respective component and the plurality of components during manufacturing of the engine assembly to guide installation of the respective component and the plurality of components based on the guidance information.