Abstract: A suction valve includes a non-rotatable lock sleeve 20 concentrically arranged on a valve seat 3, the lock sleeve having a non-circular outer contour onto which an unloader 22 is placed with its radial central section 28 and which is correspondingly formed in a diametrically opposed manner to prevent turning.

Abstract: An air/fuel ratio controller (6) and a method that uses an upstream control loop to maintain a given optimum air/fuel ratio (?opt), whereas the optimum air/fuel ratio (?opt) is determined in the controller (6) in an downstream control loop by adding incremental offset (??) to the air/fuel ratio set-point (?SP) of an upstream control loop whilst monitoring a NOx sensor (10) output. The air/fuel ratio set-points (?SP) at two turning points (SP1, SP2) in the NOx sensor (10) output are used to calculate a new optimum air/fuel ratio set-point (?opt) as mean value of the air/fuel ratio set-points (?SP1, ?SP2) at the turning points (SP1, SP2).

Abstract: To reduce the clearance volume for a crank-side concentric suction and pressure valve, it is proposed to arrange a sealing 20 axially abutting on the suction and pressure valve 2,3, wherein the sealing 20 consists of a number of pressure packings 21a, 21 which are arranged axially one behind the other.

Abstract: The hollow valve plate 1 of a piston compressor for liquid-cooled reed valves comprises a single half-shell 3 with cooling channels 4 which are open on the cylinder side, which said half-shell is covered by a reed plate 2 which is preferably welded or glued at least along the cooling channels 4 and has in the area of the suction openings 5 in each case one suction reed 6 which is machined out and is integrally connected on one side. Production and assembly are thereby simplified and the clearance is reduced.

Abstract: A method of ion sensing in a CD ignition system for an internal combustion engine comprises: a) closing the controllable switch in synchronism with the internal combustion engine for a period of time to transfer energy to the ignition coil primary to cause a spark breakdown across the spark plug; and b) observing the current in the secondary winding circuit indicative of ionization in the vicinity of the spark plug electrodes.

Abstract: A gaseous fuel control system for a dual-fuel internal combustion engine comprising a plurality of valves for controlling the amount of gaseous fuel supplied to the engine. The valves have adjustable full-open flow rates and rapidly move from full-open to full-closed in response to a digital signal. An electronic system for monitoring at least one engine operating parameter maps the parameter value to control the opening and closing of the valves to establish a desired gaseous fuel flow rate.

Abstract: A spring cup in an automatic suction and pressure valve has an internal contour which opens in the shape of a calotte so as to reduce wear at the ends of a valve spring positioned in the spring cup and thereby lengthen its useful life.

Abstract: A segmented piston ring assembly includes piston ring segments 2 having stepped ends 5, 6, at least one piston ring segment 2 including a radial step on a radially inner peripheral surface 9 over a part of the width of the piston ring segment 2, and a single-cut sealing ring 3, which bears radially against the inside of the peripheral surface 9 of the piston ring segments 2, the sealing ring 3 including an axial recess 10, 12 which cooperates with the radial step 4 of the piston ring segment 2 to prevent relative rotation therebetween.

Abstract: A multipart packing ring for sealing a piston rod of a compressor includes ring segments and sealing segments which are alternatingly arranged to form a ring. The ring segments include a curved main part and an axial shoulder and the sealing segments include a curved main part and an axial projection. The circumferential ends of the main part of the ring segments and the circumferential ends of the axial projection of the sealing elements face one another and define first wear gaps there-between.

Abstract: This invention relates to a method for knock detection in a combustion engine, in which combustion is controlled by a control unit (2), which comprises the steps of, a) obtaining at least one sensor signal (4, 4?) carrying information of knock intensity related within a combustion chamber of the combustion engine (1); (b) processing the sensor signal (4, 4?) to obtain a knock intensity related detection variable (z1), (c) using said detection variable (z1) in said control unit (2) arranged to avoid a knocking condition in said combustion engine (1), if the value (z1) of said detection variable indicates knock when compared with a threshold value (T) wherein using two different computations/processes for said processing (5, 6) of the at least one sensor signal (4, 4?) to obtain two separate sub-values (y1, y2), and thereafter combining said sub-values (y1, y2) to obtain said detection variable (z1).

Abstract: A method and system for igniting a lean fuel mixture in a main chamber of an internal combustion engine by igniting a rich air-fuel mixture in a pre-combustion chamber which is fuelled using a controlled valve. For a stable and consistent ignition of the main chamber and simultaneous reduction of emission of the internal combustion engine, a closed loop control adjusts the fuel amount and the fuelling time for the pre-combustion chamber in order to achieve a light off in an optimal time window and by sufficient ignition energy.

Abstract: A metallic separating plate 6 is arranged between the sealing rings 5 and the synchronizing plate 7 to prevent mutual wear of the sealing rings 5 and the synchronizing plate 7 in an annular valve having sealing rings 5 as sealing elements and a synchronizing plate 7 to synchronize and dampen the ring opening movement.

Abstract: Method for combustion engine control comprising an engine, at least one sensor and at least one engine control unit (200) arranged to control the engine (100) by the use of real time sensor data S(k) characterized in that a prior (P1(k, j; z), P2(k; X, Y) is used to derive at least one combustion parameter estimate (X(k)) and/or at least one combustion parameter measurement (Y(k)) from the real lime sensor data (S(k)) and that the at least one combustion parameter estimate (X(k)) and/or the at least one combustion parameter measurement (Y(k)) is used in performing said engine control.