Abstract: Catalyst for the abatement of ammonia from the exhaust of gasoline internal combustion engines The present invention relates to a catalyst comprising a carrier body having a length L extending between a first end face and a second end face, and differently composed material zones A, B and C arranged on the carrier body, wherein material zone A comprises rhodium and/or nickel and/or cerium; material zone B comprises platinum; and material zone C comprises a zeolite which is able to store ammonia and to catalyze the selective catalytic reduction of NOx.

Abstract: A device for controlling the variation of the opening and closing times and durations of a valve (8) comprises an elastic means (18) acting upon an assembly consisting of a lever device (1) and a valve stem (11) not in the closing direction but in the opening direction of the valve (8). The assembly consisting of the lever device (1) and of the opening cam (5) and the closing cam (6) fulfils a dual function, one for opening the valve (8), the other for moving it back for its closure. The control device, which comprises a device for offsetting the angular position of the cam position relative to the crankshaft, allows to control the opening and closing duration of the valve (8) over a very wide range extending, for opening, from 210° to 350° of crankshaft rotation approximately, by varying the valve opening and closing times independently of each other. It is applicable to a wide range of engines.

Abstract: A device for controlling the variation of the opening and closing times and durations of a valve (8) comprises an elastic means (18) acting upon an assembly consisting of a lever device (1) and a valve stem (11) not in the closing direction but in the opening direction of the valve (8). The assembly consisting of the lever device (1) and of the opening cam (5) and the closing cam (6) fulfils a dual function, one for opening the valve (8), the other for moving it back for its closure. The control device, which comprises a device for offsetting the angular position of the cam position relative to the crankshaft, allows to control the opening and closing duration of the valve (8) over a very wide range extending, for opening, from 210° to 350° of crankshaft rotation approximately, by varying the valve opening and closing times independently of each other. It is applicable to a wide range of engines.